add hevc support to v4l2 request patch

[packages/ffmpeg.git] / v4l2-request-hwdec.patch

From 904af26693095364851bbc6c6557fca9b3437b69 Mon Sep 17 00:00:00 2001
From: Jonas Karlman <jonas@kwiboo.se>
Date: Mon, 3 Dec 2018 23:48:04 +0100
Subject: [PATCH 01/17] avutil: add av_buffer_pool_flush()

Used by V4L2 request API hwaccel

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
 libavutil/buffer.c | 13 +++++++++++++
 libavutil/buffer.h |  5 +++++
 2 files changed, 18 insertions(+)

diff --git a/libavutil/buffer.c b/libavutil/buffer.c
index 858633e8c73..41555d99825 100644
--- a/libavutil/buffer.c
+++ b/libavutil/buffer.c
@@ -305,6 +305,19 @@ static void buffer_pool_free(AVBufferPool *pool)
     av_freep(&pool);
 }
 
+void av_buffer_pool_flush(AVBufferPool *pool)
+{
+    ff_mutex_lock(&pool->mutex);
+    while (pool->pool) {
+        BufferPoolEntry *buf = pool->pool;
+        pool->pool = buf->next;
+
+        buf->free(buf->opaque, buf->data);
+        av_freep(&buf);
+    }
+    ff_mutex_unlock(&pool->mutex);
+}
+
 void av_buffer_pool_uninit(AVBufferPool **ppool)
 {
     AVBufferPool *pool;
diff --git a/libavutil/buffer.h b/libavutil/buffer.h
index 241a80ed670..f41363faf1d 100644
--- a/libavutil/buffer.h
+++ b/libavutil/buffer.h
@@ -315,6 +315,11 @@ AVBufferPool *av_buffer_pool_init2(size_t size, void *opaque,
 #endif
                                    void (*pool_free)(void *opaque));
 
+/**
+ * Free all available buffers in a buffer pool.
+ */
+ void av_buffer_pool_flush(AVBufferPool *pool);
+
 /**
  * Mark the pool as being available for freeing. It will actually be freed only
  * once all the allocated buffers associated with the pool are released. Thus it

From ec84dc22e99f544e4de7c43e7f8ef9ab7ee8e19b Mon Sep 17 00:00:00 2001
From: Jonas Karlman <jonas@kwiboo.se>
Date: Sat, 15 Dec 2018 22:32:16 +0100
Subject: [PATCH 02/17] Add common V4L2 request API code

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
 configure                 |  12 +
 libavcodec/Makefile       |   1 +
 libavcodec/hwconfig.h     |   2 +
 libavcodec/v4l2_request.c | 984 ++++++++++++++++++++++++++++++++++++++
 libavcodec/v4l2_request.h |  77 +++
 5 files changed, 1076 insertions(+)
 create mode 100644 libavcodec/v4l2_request.c
 create mode 100644 libavcodec/v4l2_request.h

diff --git a/configure b/configure
index d7a3f507e83..f2e203d1346 100755
--- a/configure
+++ b/configure
@@ -279,6 +279,7 @@ External library support:
                            if openssl, gnutls or mbedtls is not used [no]
   --enable-libtwolame      enable MP2 encoding via libtwolame [no]
   --enable-libuavs3d       enable AVS3 decoding via libuavs3d [no]
+  --enable-libudev         enable libudev [no]
   --enable-libv4l2         enable libv4l2/v4l-utils [no]
   --enable-libvidstab      enable video stabilization using vid.stab [no]
   --enable-libvmaf         enable vmaf filter via libvmaf [no]
@@ -346,6 +347,7 @@ External library support:
   --enable-omx-rpi         enable OpenMAX IL code for Raspberry Pi [no]
   --enable-rkmpp           enable Rockchip Media Process Platform code [no]
   --disable-v4l2-m2m       disable V4L2 mem2mem code [autodetect]
+  --enable-v4l2-request    enable V4L2 request API code [no]
   --disable-vaapi          disable Video Acceleration API (mainly Unix/Intel) code [autodetect]
   --disable-vdpau          disable Nvidia Video Decode and Presentation API for Unix code [autodetect]
   --disable-videotoolbox   disable VideoToolbox code [autodetect]
@@ -1814,6 +1816,7 @@ EXTERNAL_LIBRARY_LIST="
     libtheora
     libtwolame
     libuavs3d
+    libudev
     libv4l2
     libvmaf
     libvorbis
@@ -1868,6 +1871,7 @@ HWACCEL_LIBRARY_LIST="
     mmal
     omx
     opencl
+    v4l2_request
     vulkan
 "
 
@@ -2919,6 +2923,7 @@ d3d11va_deps="dxva_h ID3D11VideoDecoder ID3D11VideoContext"
 dxva2_deps="dxva2api_h DXVA2_ConfigPictureDecode ole32 user32"
 ffnvcodec_deps_any="libdl LoadLibrary"
 nvdec_deps="ffnvcodec"
+v4l2_request_deps="linux_videodev2_h linux_media_h v4l2_timeval_to_ns libdrm libudev"
 vaapi_x11_deps="xlib"
 videotoolbox_hwaccel_deps="videotoolbox pthreads"
 videotoolbox_hwaccel_extralibs="-framework QuartzCore"
@@ -6438,6 +6443,7 @@ enabled libtwolame        && require libtwolame twolame.h twolame_init -ltwolame
                              { check_lib libtwolame twolame.h twolame_encode_buffer_float32_interleaved -ltwolame ||
                                die "ERROR: libtwolame must be installed and version must be >= 0.3.10"; }
 enabled libuavs3d         && require_pkg_config libuavs3d "uavs3d >= 1.1.41" uavs3d.h uavs3d_decode
+enabled libudev           && require_pkg_config libudev libudev libudev.h udev_new
 enabled libv4l2           && require_pkg_config libv4l2 libv4l2 libv4l2.h v4l2_ioctl
 enabled libvidstab        && require_pkg_config libvidstab "vidstab >= 0.98" vid.stab/libvidstab.h vsMotionDetectInit
 enabled libvmaf           && require_pkg_config libvmaf "libvmaf >= 1.5.2" libvmaf.h compute_vmaf
@@ -6536,6 +6542,10 @@ enabled rkmpp             && { require_pkg_config rkmpp rockchip_mpp  rockchip/r
                                { enabled libdrm ||
                                  die "ERROR: rkmpp requires --enable-libdrm"; }
                              }
+enabled v4l2_request      && { enabled libdrm ||
+                               die "ERROR: v4l2-request requires --enable-libdrm"; } &&
+                             { enabled libudev ||
+                               die "ERROR: v4l2-request requires --enable-libudev"; }
 enabled vapoursynth       && require_pkg_config vapoursynth "vapoursynth-script >= 42" VSScript.h vsscript_init
 
 
@@ -6617,6 +6627,8 @@ if enabled v4l2_m2m; then
     check_cc vp9_v4l2_m2m linux/videodev2.h "int i = V4L2_PIX_FMT_VP9;"
 fi
 
+check_func_headers "linux/media.h linux/videodev2.h" v4l2_timeval_to_ns
+
 check_headers sys/videoio.h
 test_code cc sys/videoio.h "struct v4l2_frmsizeenum vfse; vfse.discrete.width = 0;" && enable_sanitized struct_v4l2_frmivalenum_discrete
 
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 33a280cf695..90dfffcb200 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -155,6 +155,7 @@ OBJS-$(CONFIG_VP3DSP)                  += vp3dsp.o
 OBJS-$(CONFIG_VP56DSP)                 += vp56dsp.o
 OBJS-$(CONFIG_VP8DSP)                  += vp8dsp.o
 OBJS-$(CONFIG_V4L2_M2M)                += v4l2_m2m.o v4l2_context.o v4l2_buffers.o v4l2_fmt.o
+OBJS-$(CONFIG_V4L2_REQUEST)            += v4l2_request.o
 OBJS-$(CONFIG_WMA_FREQS)               += wma_freqs.o
 OBJS-$(CONFIG_WMV2DSP)                 += wmv2dsp.o
 
diff --git a/libavcodec/hwconfig.h b/libavcodec/hwconfig.h
index f421dc909f4..ee78d8ab8e8 100644
--- a/libavcodec/hwconfig.h
+++ b/libavcodec/hwconfig.h
@@ -80,6 +80,8 @@ typedef struct AVCodecHWConfigInternal {
     HW_CONFIG_HWACCEL(0, 0, 1, D3D11VA_VLD,  NONE,         ff_ ## codec ## _d3d11va_hwaccel)
 #define HWACCEL_XVMC(codec) \
     HW_CONFIG_HWACCEL(0, 0, 1, XVMC,         NONE,         ff_ ## codec ## _xvmc_hwaccel)
+#define HWACCEL_V4L2REQUEST(codec) \
+    HW_CONFIG_HWACCEL(1, 0, 0, DRM_PRIME,    DRM,          ff_ ## codec ## _v4l2request_hwaccel)
 
 #define HW_CONFIG_ENCODER(device, frames, ad_hoc, format, device_type_) \
     &(const AVCodecHWConfigInternal) { \
diff --git a/libavcodec/v4l2_request.c b/libavcodec/v4l2_request.c
new file mode 100644
index 00000000000..5234b5049b0
--- /dev/null
+++ b/libavcodec/v4l2_request.c
@@ -0,0 +1,984 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <drm_fourcc.h>
+#include <linux/media.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#include <sys/sysmacros.h>
+#include <libudev.h>
+
+#include "decode.h"
+#include "internal.h"
+#include "v4l2_request.h"
+
+uint64_t ff_v4l2_request_get_capture_timestamp(AVFrame *frame)
+{
+    V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)frame->data[0];
+    return req ? v4l2_timeval_to_ns(&req->capture.buffer.timestamp) : 0;
+}
+
+int ff_v4l2_request_reset_frame(AVCodecContext *avctx, AVFrame *frame)
+{
+    V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)frame->data[0];
+    memset(&req->drm, 0, sizeof(AVDRMFrameDescriptor));
+    req->output.used = 0;
+    return 0;
+}
+
+int ff_v4l2_request_append_output_buffer(AVCodecContext *avctx, AVFrame *frame, const uint8_t *data, uint32_t size)
+{
+    V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)frame->data[0];
+    if (req->output.used + size + (AV_INPUT_BUFFER_PADDING_SIZE * 4) <= req->output.size) {
+        memcpy(req->output.addr + req->output.used, data, size);
+        req->output.used += size;
+    } else {
+        av_log(avctx, AV_LOG_ERROR, "%s: output.used=%u output.size=%u size=%u\n", __func__, req->output.used, req->output.size, size);
+    }
+    return 0;
+}
+
+static int v4l2_request_controls(V4L2RequestContext *ctx, int request_fd, unsigned long type, struct v4l2_ext_control *control, int count)
+{
+    struct v4l2_ext_controls controls = {
+        .controls = control,
+        .count = count,
+        .request_fd = request_fd,
+        .which = (request_fd >= 0) ? V4L2_CTRL_WHICH_REQUEST_VAL : 0,
+    };
+
+    if (!control || !count)
+        return 0;
+
+    return ioctl(ctx->video_fd, type, &controls);
+}
+
+static int v4l2_request_set_controls(V4L2RequestContext *ctx, int request_fd, struct v4l2_ext_control *control, int count)
+{
+    return v4l2_request_controls(ctx, request_fd, VIDIOC_S_EXT_CTRLS, control, count);
+}
+
+int ff_v4l2_request_set_controls(AVCodecContext *avctx, struct v4l2_ext_control *control, int count)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    int ret;
+
+    ret = v4l2_request_controls(ctx, -1, VIDIOC_S_EXT_CTRLS, control, count);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: set controls failed, %s (%d)\n", __func__, strerror(errno), errno);
+        return AVERROR(EINVAL);
+    }
+
+    return ret;
+}
+
+int ff_v4l2_request_get_controls(AVCodecContext *avctx, struct v4l2_ext_control *control, int count)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    int ret;
+
+    ret = v4l2_request_controls(ctx, -1, VIDIOC_G_EXT_CTRLS, control, count);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: get controls failed, %s (%d)\n", __func__, strerror(errno), errno);
+        return AVERROR(EINVAL);
+    }
+
+    return ret;
+}
+
+int ff_v4l2_request_query_control(AVCodecContext *avctx, struct v4l2_query_ext_ctrl *control)
+{
+    int ret;
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+
+    ret = ioctl(ctx->video_fd, VIDIOC_QUERY_EXT_CTRL, control);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: query control failed, %s (%d)\n", __func__, strerror(errno), errno);
+        return AVERROR(EINVAL);
+    }
+
+    return 0;
+}
+
+int ff_v4l2_request_query_control_default_value(AVCodecContext *avctx, uint32_t id)
+{
+    int ret;
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    struct v4l2_queryctrl control = {
+        .id = id,
+    };
+
+    ret = ioctl(ctx->video_fd, VIDIOC_QUERYCTRL, &control);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: query control failed, %s (%d)\n", __func__, strerror(errno), errno);
+        return AVERROR(EINVAL);
+    }
+
+    return control.default_value;
+}
+
+static int v4l2_request_queue_buffer(V4L2RequestContext *ctx, int request_fd, V4L2RequestBuffer *buf, uint32_t flags)
+{
+    struct v4l2_plane planes[1] = {};
+    struct v4l2_buffer buffer = {
+        .type = buf->buffer.type,
+        .memory = buf->buffer.memory,
+        .index = buf->index,
+        .timestamp.tv_usec = ctx->timestamp,
+        .bytesused = buf->used,
+        .request_fd = request_fd,
+        .flags = ((request_fd >= 0) ? V4L2_BUF_FLAG_REQUEST_FD : 0) | flags,
+    };
+
+    buf->buffer.timestamp = buffer.timestamp;
+
+    if (V4L2_TYPE_IS_MULTIPLANAR(buf->buffer.type)) {
+        planes[0].bytesused = buf->used;
+        buffer.bytesused = 0;
+        buffer.length = 1;
+        buffer.m.planes = planes;
+    }
+
+    return ioctl(ctx->video_fd, VIDIOC_QBUF, &buffer);
+}
+
+static int v4l2_request_dequeue_buffer(V4L2RequestContext *ctx, V4L2RequestBuffer *buf)
+{
+    int ret;
+    struct v4l2_plane planes[1] = {};
+    struct v4l2_buffer buffer = {
+        .type = buf->buffer.type,
+        .memory = buf->buffer.memory,
+        .index = buf->index,
+    };
+
+    if (V4L2_TYPE_IS_MULTIPLANAR(buf->buffer.type)) {
+        buffer.length = 1;
+        buffer.m.planes = planes;
+    }
+
+    ret = ioctl(ctx->video_fd, VIDIOC_DQBUF, &buffer);
+    if (ret < 0)
+        return ret;
+
+    buf->buffer.timestamp = buffer.timestamp;
+    return 0;
+}
+
+const uint32_t v4l2_request_capture_pixelformats[] = {
+    V4L2_PIX_FMT_NV12,
+#ifdef DRM_FORMAT_MOD_ALLWINNER_TILED
+    V4L2_PIX_FMT_SUNXI_TILED_NV12,
+#endif
+};
+
+static int v4l2_request_set_drm_descriptor(V4L2RequestDescriptor *req, struct v4l2_format *format)
+{
+    AVDRMFrameDescriptor *desc = &req->drm;
+    AVDRMLayerDescriptor *layer = &desc->layers[0];
+    uint32_t pixelformat = V4L2_TYPE_IS_MULTIPLANAR(format->type) ? format->fmt.pix_mp.pixelformat : format->fmt.pix.pixelformat;
+
+    switch (pixelformat) {
+    case V4L2_PIX_FMT_NV12:
+        layer->format = DRM_FORMAT_NV12;
+        desc->objects[0].format_modifier = DRM_FORMAT_MOD_LINEAR;
+        break;
+#ifdef DRM_FORMAT_MOD_ALLWINNER_TILED
+    case V4L2_PIX_FMT_SUNXI_TILED_NV12:
+        layer->format = DRM_FORMAT_NV12;
+        desc->objects[0].format_modifier = DRM_FORMAT_MOD_ALLWINNER_TILED;
+        break;
+#endif
+    default:
+        return -1;
+    }
+
+    desc->nb_objects = 1;
+    desc->objects[0].fd = req->capture.fd;
+    desc->objects[0].size = req->capture.size;
+
+    desc->nb_layers = 1;
+    layer->nb_planes = 2;
+
+    layer->planes[0].object_index = 0;
+    layer->planes[0].offset = 0;
+    layer->planes[0].pitch = V4L2_TYPE_IS_MULTIPLANAR(format->type) ? format->fmt.pix_mp.plane_fmt[0].bytesperline : format->fmt.pix.bytesperline;
+
+    layer->planes[1].object_index = 0;
+    layer->planes[1].offset = layer->planes[0].pitch * (V4L2_TYPE_IS_MULTIPLANAR(format->type) ? format->fmt.pix_mp.height : format->fmt.pix.height);
+    layer->planes[1].pitch = layer->planes[0].pitch;
+
+    return 0;
+}
+
+static int v4l2_request_queue_decode(AVCodecContext *avctx, AVFrame *frame, struct v4l2_ext_control *control, int count, int first_slice, int last_slice)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)frame->data[0];
+    struct timeval tv = { 2, 0 };
+    fd_set except_fds;
+    int ret;
+
+    av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p used=%u controls=%d index=%d fd=%d request_fd=%d first_slice=%d last_slice=%d\n", __func__, avctx, req->output.used, count, req->capture.index, req->capture.fd, req->request_fd, first_slice, last_slice);
+
+    if (first_slice)
+        ctx->timestamp++;
+
+    ret = v4l2_request_set_controls(ctx, req->request_fd, control, count);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: set controls failed for request %d, %s (%d)\n", __func__, req->request_fd, strerror(errno), errno);
+        return -1;
+    }
+
+    memset(req->output.addr + req->output.used, 0, AV_INPUT_BUFFER_PADDING_SIZE * 4);
+
+    ret = v4l2_request_queue_buffer(ctx, req->request_fd, &req->output, last_slice ? 0 : V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: queue output buffer %d failed for request %d, %s (%d)\n", __func__, req->output.index, req->request_fd, strerror(errno), errno);
+        return -1;
+    }
+
+    if (first_slice) {
+        ret = v4l2_request_queue_buffer(ctx, -1, &req->capture, 0);
+        if (ret < 0) {
+            av_log(avctx, AV_LOG_ERROR, "%s: queue capture buffer %d failed for request %d, %s (%d)\n", __func__, req->capture.index, req->request_fd, strerror(errno), errno);
+            return -1;
+        }
+    }
+
+    // NOTE: do we need to dequeue when request fails/timeout?
+
+    // 4. queue request and wait
+    ret = ioctl(req->request_fd, MEDIA_REQUEST_IOC_QUEUE, NULL);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: queue request %d failed, %s (%d)\n", __func__, req->request_fd, strerror(errno), errno);
+        goto fail;
+    }
+
+    FD_ZERO(&except_fds);
+    FD_SET(req->request_fd, &except_fds);
+
+    ret = select(req->request_fd + 1, NULL, NULL, &except_fds, &tv);
+    if (ret == 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: request %d timeout\n", __func__, req->request_fd);
+        goto fail;
+    } else if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: select request %d failed, %s (%d)\n", __func__, req->request_fd, strerror(errno), errno);
+        goto fail;
+    }
+
+    ret = v4l2_request_dequeue_buffer(ctx, &req->output);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: dequeue output buffer %d failed for request %d, %s (%d)\n", __func__, req->output.index, req->request_fd, strerror(errno), errno);
+        return -1;
+    }
+
+    if (last_slice) {
+        ret = v4l2_request_dequeue_buffer(ctx, &req->capture);
+        if (ret < 0) {
+            av_log(avctx, AV_LOG_ERROR, "%s: dequeue capture buffer %d failed for request %d, %s (%d)\n", __func__, req->capture.index, req->request_fd, strerror(errno), errno);
+            return -1;
+        }
+    }
+
+    // TODO: check errors
+    // buffer.flags & V4L2_BUF_FLAG_ERROR
+
+    ret = ioctl(req->request_fd, MEDIA_REQUEST_IOC_REINIT, NULL);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: reinit request %d failed, %s (%d)\n", __func__, req->request_fd, strerror(errno), errno);
+        return -1;
+    }
+
+    if (last_slice)
+        return v4l2_request_set_drm_descriptor(req, &ctx->format);
+
+    return 0;
+
+fail:
+    ret = v4l2_request_dequeue_buffer(ctx, &req->output);
+    if (ret < 0)
+        av_log(avctx, AV_LOG_ERROR, "%s: dequeue output buffer %d failed for request %d, %s (%d)\n", __func__, req->output.index, req->request_fd, strerror(errno), errno);
+
+    ret = v4l2_request_dequeue_buffer(ctx, &req->capture);
+    if (ret < 0)
+        av_log(avctx, AV_LOG_ERROR, "%s: dequeue capture buffer %d failed for request %d, %s (%d)\n", __func__, req->capture.index, req->request_fd, strerror(errno), errno);
+
+    ret = ioctl(req->request_fd, MEDIA_REQUEST_IOC_REINIT, NULL);
+    if (ret < 0)
+        av_log(avctx, AV_LOG_ERROR, "%s: reinit request %d failed, %s (%d)\n", __func__, req->request_fd, strerror(errno), errno);
+
+    return -1;
+}
+
+int ff_v4l2_request_decode_slice(AVCodecContext *avctx, AVFrame *frame, struct v4l2_ext_control *control, int count, int first_slice, int last_slice)
+{
+    V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)frame->data[0];
+
+    // fall back to queue each slice as a full frame
+    if ((req->output.capabilities & V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF) != V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF)
+        return v4l2_request_queue_decode(avctx, frame, control, count, 1, 1);
+
+    return v4l2_request_queue_decode(avctx, frame, control, count, first_slice, last_slice);
+}
+
+int ff_v4l2_request_decode_frame(AVCodecContext *avctx, AVFrame *frame, struct v4l2_ext_control *control, int count)
+{
+    return v4l2_request_queue_decode(avctx, frame, control, count, 1, 1);
+}
+
+static int v4l2_request_try_format(AVCodecContext *avctx, enum v4l2_buf_type type, uint32_t pixelformat)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    struct v4l2_fmtdesc fmtdesc = {
+        .index = 0,
+        .type = type,
+    };
+
+    if (V4L2_TYPE_IS_OUTPUT(type)) {
+        struct v4l2_create_buffers buffers = {
+            .count = 0,
+            .memory = V4L2_MEMORY_MMAP,
+            .format.type = type,
+        };
+
+        if (ioctl(ctx->video_fd, VIDIOC_CREATE_BUFS, &buffers) < 0) {
+            av_log(avctx, AV_LOG_ERROR, "%s: create buffers failed for type %u, %s (%d)\n", __func__, type, strerror(errno), errno);
+            return -1;
+        }
+
+        if ((buffers.capabilities & V4L2_BUF_CAP_SUPPORTS_REQUESTS) != V4L2_BUF_CAP_SUPPORTS_REQUESTS) {
+            av_log(avctx, AV_LOG_INFO, "%s: output buffer type do not support requests, capabilities %u\n", __func__, buffers.capabilities);
+            return -1;
+        }
+    }
+
+    while (ioctl(ctx->video_fd, VIDIOC_ENUM_FMT, &fmtdesc) >= 0) {
+        if (fmtdesc.pixelformat == pixelformat)
+            return 0;
+
+        fmtdesc.index++;
+    }
+
+    av_log(avctx, AV_LOG_INFO, "%s: pixelformat %u not supported for type %u\n", __func__, pixelformat, type);
+    return -1;
+}
+
+static int v4l2_request_set_format(AVCodecContext *avctx, enum v4l2_buf_type type, uint32_t pixelformat, uint32_t buffersize)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    struct v4l2_format format = {
+        .type = type,
+    };
+
+    if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
+        format.fmt.pix_mp.width = avctx->coded_width;
+        format.fmt.pix_mp.height = avctx->coded_height;
+        format.fmt.pix_mp.pixelformat = pixelformat;
+        format.fmt.pix_mp.plane_fmt[0].sizeimage = buffersize;
+        format.fmt.pix_mp.num_planes = 1;
+    } else {
+        format.fmt.pix.width = avctx->coded_width;
+        format.fmt.pix.height = avctx->coded_height;
+        format.fmt.pix.pixelformat = pixelformat;
+        format.fmt.pix.sizeimage = buffersize;
+    }
+
+    return ioctl(ctx->video_fd, VIDIOC_S_FMT, &format);
+}
+
+static int v4l2_request_select_capture_format(AVCodecContext *avctx)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    enum v4l2_buf_type type = ctx->format.type;
+
+#if 0
+    struct v4l2_format format = {
+        .type = type,
+    };
+    struct v4l2_fmtdesc fmtdesc = {
+        .index = 0,
+        .type = type,
+    };
+    uint32_t pixelformat;
+    int i;
+
+    if (ioctl(ctx->video_fd, VIDIOC_G_FMT, &format) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: get capture format failed, %s (%d)\n", __func__, strerror(errno), errno);
+        return -1;
+    }
+
+    pixelformat = V4L2_TYPE_IS_MULTIPLANAR(type) ? format.fmt.pix_mp.pixelformat : format.fmt.pix.pixelformat;
+
+    for (i = 0; i < FF_ARRAY_ELEMS(v4l2_request_capture_pixelformats); i++) {
+        if (pixelformat == v4l2_request_capture_pixelformats[i])
+            return v4l2_request_set_format(avctx, type, pixelformat, 0);
+    }
+
+    while (ioctl(ctx->video_fd, VIDIOC_ENUM_FMT, &fmtdesc) >= 0) {
+        for (i = 0; i < FF_ARRAY_ELEMS(v4l2_request_capture_pixelformats); i++) {
+            if (fmtdesc.pixelformat == v4l2_request_capture_pixelformats[i])
+                return v4l2_request_set_format(avctx, type, fmtdesc.pixelformat, 0);
+        }
+
+        fmtdesc.index++;
+    }
+#else
+    for (int i = 0; i < FF_ARRAY_ELEMS(v4l2_request_capture_pixelformats); i++) {
+        uint32_t pixelformat = v4l2_request_capture_pixelformats[i];
+        if (!v4l2_request_try_format(avctx, type, pixelformat))
+            return v4l2_request_set_format(avctx, type, pixelformat, 0);
+    }
+#endif
+
+    return -1;
+}
+
+static int v4l2_request_probe_video_device(struct udev_device *device, AVCodecContext *avctx, uint32_t pixelformat, uint32_t buffersize, struct v4l2_ext_control *control, int count)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    int ret = AVERROR(EINVAL);
+    struct v4l2_capability capability = {0};
+    unsigned int capabilities = 0;
+
+    const char *path = udev_device_get_devnode(device);
+    if (!path) {
+        av_log(avctx, AV_LOG_ERROR, "%s: get video device devnode failed\n", __func__);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    ctx->video_fd = open(path, O_RDWR | O_NONBLOCK, 0);
+    if (ctx->video_fd < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: opening %s failed, %s (%d)\n", __func__, path, strerror(errno), errno);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    ret = ioctl(ctx->video_fd, VIDIOC_QUERYCAP, &capability);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: get video capability failed, %s (%d)\n", __func__, strerror(errno), errno);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    if (capability.capabilities & V4L2_CAP_DEVICE_CAPS)
+        capabilities = capability.device_caps;
+    else
+        capabilities = capability.capabilities;
+
+    av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p ctx=%p path=%s capabilities=%u\n", __func__, avctx, ctx, path, capabilities);
+
+    if ((capabilities & V4L2_CAP_STREAMING) != V4L2_CAP_STREAMING) {
+        av_log(avctx, AV_LOG_ERROR, "%s: missing required streaming capability\n", __func__);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    if ((capabilities & V4L2_CAP_VIDEO_M2M_MPLANE) == V4L2_CAP_VIDEO_M2M_MPLANE) {
+        ctx->output_type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+        ctx->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+    } else if ((capabilities & V4L2_CAP_VIDEO_M2M) == V4L2_CAP_VIDEO_M2M) {
+        ctx->output_type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
+        ctx->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+    } else {
+        av_log(avctx, AV_LOG_ERROR, "%s: missing required mem2mem capability\n", __func__);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    ret = v4l2_request_try_format(avctx, ctx->output_type, pixelformat);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_WARNING, "%s: try output format failed\n", __func__);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    ret = v4l2_request_set_format(avctx, ctx->output_type, pixelformat, buffersize);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: set output format failed, %s (%d)\n", __func__, strerror(errno), errno);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    ret = v4l2_request_set_controls(ctx, -1, control, count);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: set controls failed, %s (%d)\n", __func__, strerror(errno), errno);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    ret = v4l2_request_select_capture_format(avctx);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_WARNING, "%s: select capture format failed\n", __func__);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    return 0;
+
+fail:
+    if (ctx->video_fd >= 0) {
+        close(ctx->video_fd);
+        ctx->video_fd = -1;
+    }
+    return ret;
+}
+
+static int v4l2_request_init_context(AVCodecContext *avctx)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    int ret;
+
+    ret = ioctl(ctx->video_fd, VIDIOC_G_FMT, &ctx->format);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: get capture format failed, %s (%d)\n", __func__, strerror(errno), errno);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    if (V4L2_TYPE_IS_MULTIPLANAR(ctx->format.type)) {
+        av_log(avctx, AV_LOG_DEBUG, "%s: pixelformat=%d width=%u height=%u bytesperline=%u sizeimage=%u num_planes=%u\n", __func__, ctx->format.fmt.pix_mp.pixelformat, ctx->format.fmt.pix_mp.width, ctx->format.fmt.pix_mp.height, ctx->format.fmt.pix_mp.plane_fmt[0].bytesperline, ctx->format.fmt.pix_mp.plane_fmt[0].sizeimage, ctx->format.fmt.pix_mp.num_planes);
+    } else {
+        av_log(avctx, AV_LOG_DEBUG, "%s: pixelformat=%d width=%u height=%u bytesperline=%u sizeimage=%u\n", __func__, ctx->format.fmt.pix.pixelformat, ctx->format.fmt.pix.width, ctx->format.fmt.pix.height, ctx->format.fmt.pix.bytesperline, ctx->format.fmt.pix.sizeimage);
+    }
+
+    ret = ff_decode_get_hw_frames_ctx(avctx, AV_HWDEVICE_TYPE_DRM);
+    if (ret < 0)
+        goto fail;
+
+    ret = ioctl(ctx->video_fd, VIDIOC_STREAMON, &ctx->output_type);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: output stream on failed, %s (%d)\n", __func__, strerror(errno), errno);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    ret = ioctl(ctx->video_fd, VIDIOC_STREAMON, &ctx->format.type);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: capture stream on failed, %s (%d)\n", __func__, strerror(errno), errno);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    return 0;
+
+fail:
+    ff_v4l2_request_uninit(avctx);
+    return ret;
+}
+
+static int v4l2_request_probe_media_device(struct udev_device *device, AVCodecContext *avctx, uint32_t pixelformat, uint32_t buffersize, struct v4l2_ext_control *control, int count)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    int ret;
+    struct media_device_info device_info = {0};
+    struct media_v2_topology topology = {0};
+    struct media_v2_interface *interfaces = NULL;
+    struct udev *udev = udev_device_get_udev(device);
+    struct udev_device *video_device;
+    dev_t devnum;
+
+    const char *path = udev_device_get_devnode(device);
+    if (!path) {
+        av_log(avctx, AV_LOG_ERROR, "%s: get media device devnode failed\n", __func__);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    ctx->media_fd = open(path, O_RDWR, 0);
+    if (ctx->media_fd < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: opening %s failed, %s (%d)\n", __func__, path, strerror(errno), errno);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    ret = ioctl(ctx->media_fd, MEDIA_IOC_DEVICE_INFO, &device_info);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: get media device info failed, %s (%d)\n", __func__, strerror(errno), errno);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p ctx=%p path=%s driver=%s\n", __func__, avctx, ctx, path, device_info.driver);
+
+    ret = ioctl(ctx->media_fd, MEDIA_IOC_G_TOPOLOGY, &topology);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: get media topology failed, %s (%d)\n", __func__, strerror(errno), errno);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    if (topology.num_interfaces <= 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: media device has no interfaces\n", __func__);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    interfaces = av_mallocz(topology.num_interfaces * sizeof(struct media_v2_interface));
+    if (!interfaces) {
+        av_log(avctx, AV_LOG_ERROR, "%s: allocating media interface struct failed\n", __func__);
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    topology.ptr_interfaces = (__u64)(uintptr_t)interfaces;
+    ret = ioctl(ctx->media_fd, MEDIA_IOC_G_TOPOLOGY, &topology);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: get media topology failed, %s (%d)\n", __func__, strerror(errno), errno);
+        ret = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    ret = AVERROR(EINVAL);
+    for (int i = 0; i < topology.num_interfaces; i++) {
+        if (interfaces[i].intf_type != MEDIA_INTF_T_V4L_VIDEO)
+            continue;
+
+        devnum = makedev(interfaces[i].devnode.major, interfaces[i].devnode.minor);
+        video_device = udev_device_new_from_devnum(udev, 'c', devnum);
+        if (!video_device) {
+            av_log(avctx, AV_LOG_ERROR, "%s: video_device=%p\n", __func__, video_device);
+            continue;
+        }
+
+        ret = v4l2_request_probe_video_device(video_device, avctx, pixelformat, buffersize, control, count);
+        udev_device_unref(video_device);
+
+        if (!ret)
+            break;
+    }
+
+    av_freep(&interfaces);
+    return ret;
+
+fail:
+    av_freep(&interfaces);
+    if (ctx->media_fd >= 0) {
+        close(ctx->media_fd);
+        ctx->media_fd = -1;
+    }
+    return ret;
+}
+
+int ff_v4l2_request_init(AVCodecContext *avctx, uint32_t pixelformat, uint32_t buffersize, struct v4l2_ext_control *control, int count)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    int ret = AVERROR(EINVAL);
+    struct udev *udev;
+    struct udev_enumerate *enumerate;
+    struct udev_list_entry *devices;
+    struct udev_list_entry *entry;
+    struct udev_device *device;
+
+    av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p hw_device_ctx=%p hw_frames_ctx=%p\n", __func__, avctx, avctx->hw_device_ctx, avctx->hw_frames_ctx);
+
+    ctx->media_fd = -1;
+    ctx->video_fd = -1;
+    ctx->timestamp = 0;
+
+    udev = udev_new();
+    if (!udev) {
+        av_log(avctx, AV_LOG_ERROR, "%s: allocating udev context failed\n", __func__);
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    enumerate = udev_enumerate_new(udev);
+    if (!enumerate) {
+        av_log(avctx, AV_LOG_ERROR, "%s: allocating udev enumerator failed\n", __func__);
+        ret = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    udev_enumerate_add_match_subsystem(enumerate, "media");
+    udev_enumerate_scan_devices(enumerate);
+
+    devices = udev_enumerate_get_list_entry(enumerate);
+    udev_list_entry_foreach(entry, devices) {
+        const char *path = udev_list_entry_get_name(entry);
+        if (!path)
+            continue;
+
+        device = udev_device_new_from_syspath(udev, path);
+        if (!device)
+            continue;
+
+        ret = v4l2_request_probe_media_device(device, avctx, pixelformat, buffersize, control, count);
+        udev_device_unref(device);
+
+        if (!ret)
+            break;
+    }
+
+    udev_enumerate_unref(enumerate);
+
+    if (!ret)
+        ret = v4l2_request_init_context(avctx);
+
+fail:
+    udev_unref(udev);
+    return ret;
+}
+
+int ff_v4l2_request_uninit(AVCodecContext *avctx)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    int ret;
+
+    av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p ctx=%p\n", __func__, avctx, ctx);
+
+    if (ctx->video_fd >= 0) {
+        ret = ioctl(ctx->video_fd, VIDIOC_STREAMOFF, &ctx->output_type);
+        if (ret < 0)
+            av_log(avctx, AV_LOG_ERROR, "%s: output stream off failed, %s (%d)\n", __func__, strerror(errno), errno);
+
+        ret = ioctl(ctx->video_fd, VIDIOC_STREAMOFF, &ctx->format.type);
+        if (ret < 0)
+            av_log(avctx, AV_LOG_ERROR, "%s: capture stream off failed, %s (%d)\n", __func__, strerror(errno), errno);
+    }
+
+    if (avctx->hw_frames_ctx) {
+        AVHWFramesContext *hwfc = (AVHWFramesContext*)avctx->hw_frames_ctx->data;
+        av_buffer_pool_flush(hwfc->pool);
+    }
+
+    if (ctx->video_fd >= 0)
+        close(ctx->video_fd);
+
+    if (ctx->media_fd >= 0)
+        close(ctx->media_fd);
+
+    return 0;
+}
+
+static int v4l2_request_buffer_alloc(AVCodecContext *avctx, V4L2RequestBuffer *buf, enum v4l2_buf_type type)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    int ret;
+    struct v4l2_plane planes[1] = {};
+    struct v4l2_create_buffers buffers = {
+        .count = 1,
+        .memory = V4L2_MEMORY_MMAP,
+        .format.type = type,
+    };
+
+    av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p buf=%p type=%u\n", __func__, avctx, buf, type);
+
+    ret = ioctl(ctx->video_fd, VIDIOC_G_FMT, &buffers.format);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: get format failed for type %u, %s (%d)\n", __func__, type, strerror(errno), errno);
+        return ret;
+    }
+
+    if (V4L2_TYPE_IS_MULTIPLANAR(buffers.format.type)) {
+        av_log(avctx, AV_LOG_DEBUG, "%s: pixelformat=%d width=%u height=%u bytesperline=%u sizeimage=%u num_planes=%u\n", __func__, buffers.format.fmt.pix_mp.pixelformat, buffers.format.fmt.pix_mp.width, buffers.format.fmt.pix_mp.height, buffers.format.fmt.pix_mp.plane_fmt[0].bytesperline, buffers.format.fmt.pix_mp.plane_fmt[0].sizeimage, buffers.format.fmt.pix_mp.num_planes);
+    } else {
+        av_log(avctx, AV_LOG_DEBUG, "%s: pixelformat=%d width=%u height=%u bytesperline=%u sizeimage=%u\n", __func__, buffers.format.fmt.pix.pixelformat, buffers.format.fmt.pix.width, buffers.format.fmt.pix.height, buffers.format.fmt.pix.bytesperline, buffers.format.fmt.pix.sizeimage);
+    }
+
+    ret = ioctl(ctx->video_fd, VIDIOC_CREATE_BUFS, &buffers);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: create buffers failed for type %u, %s (%d)\n", __func__, type, strerror(errno), errno);
+        return ret;
+    }
+
+    if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
+        buf->width = buffers.format.fmt.pix_mp.width;
+        buf->height = buffers.format.fmt.pix_mp.height;
+        buf->size = buffers.format.fmt.pix_mp.plane_fmt[0].sizeimage;
+        buf->buffer.length = 1;
+        buf->buffer.m.planes = planes;
+    } else {
+        buf->width = buffers.format.fmt.pix.width;
+        buf->height = buffers.format.fmt.pix.height;
+        buf->size = buffers.format.fmt.pix.sizeimage;
+    }
+
+    buf->index = buffers.index;
+    buf->capabilities = buffers.capabilities;
+    buf->used = 0;
+
+    buf->buffer.type = type;
+    buf->buffer.memory = V4L2_MEMORY_MMAP;
+    buf->buffer.index = buf->index;
+
+    ret = ioctl(ctx->video_fd, VIDIOC_QUERYBUF, &buf->buffer);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: query buffer %d failed, %s (%d)\n", __func__, buf->index, strerror(errno), errno);
+        return ret;
+    }
+
+    if (V4L2_TYPE_IS_OUTPUT(type)) {
+        void *addr = mmap(NULL, buf->size, PROT_READ | PROT_WRITE, MAP_SHARED, ctx->video_fd, V4L2_TYPE_IS_MULTIPLANAR(type) ? buf->buffer.m.planes[0].m.mem_offset : buf->buffer.m.offset);
+        if (addr == MAP_FAILED) {
+            av_log(avctx, AV_LOG_ERROR, "%s: mmap failed, %s (%d)\n", __func__, strerror(errno), errno);
+            return -1;
+        }
+
+        buf->addr = (uint8_t*)addr;
+    } else {
+        struct v4l2_exportbuffer exportbuffer = {
+            .type = type,
+            .index = buf->index,
+            .flags = O_RDONLY,
+        };
+
+        ret = ioctl(ctx->video_fd, VIDIOC_EXPBUF, &exportbuffer);
+        if (ret < 0) {
+            av_log(avctx, AV_LOG_ERROR, "%s: export buffer %d failed, %s (%d)\n", __func__, buf->index, strerror(errno), errno);
+            return ret;
+        }
+
+        buf->fd = exportbuffer.fd;
+    }
+
+    av_log(avctx, AV_LOG_DEBUG, "%s: buf=%p index=%d fd=%d addr=%p width=%u height=%u size=%u\n", __func__, buf, buf->index, buf->fd, buf->addr, buf->width, buf->height, buf->size);
+    return 0;
+}
+
+static void v4l2_request_buffer_free(V4L2RequestBuffer *buf)
+{
+    av_log(NULL, AV_LOG_DEBUG, "%s: buf=%p index=%d fd=%d addr=%p width=%u height=%u size=%u\n", __func__, buf, buf->index, buf->fd, buf->addr, buf->width, buf->height, buf->size);
+
+    if (buf->addr)
+        munmap(buf->addr, buf->size);
+
+    if (buf->fd >= 0)
+        close(buf->fd);
+}
+
+static void v4l2_request_frame_free(void *opaque, uint8_t *data)
+{
+    AVCodecContext *avctx = opaque;
+    V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)data;
+
+    av_log(NULL, AV_LOG_DEBUG, "%s: avctx=%p data=%p request_fd=%d\n", __func__, avctx, data, req->request_fd);
+
+    if (req->request_fd >= 0)
+        close(req->request_fd);
+
+    v4l2_request_buffer_free(&req->capture);
+    v4l2_request_buffer_free(&req->output);
+
+    av_free(data);
+}
+
+static AVBufferRef *v4l2_request_frame_alloc(void *opaque, int size)
+{
+    AVCodecContext *avctx = opaque;
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    V4L2RequestDescriptor *req;
+    AVBufferRef *ref;
+    uint8_t *data;
+    int ret;
+
+    data = av_mallocz(size);
+    if (!data)
+        return NULL;
+
+    av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p size=%d data=%p\n", __func__, avctx, size, data);
+
+    ref = av_buffer_create(data, size, v4l2_request_frame_free, avctx, 0);
+    if (!ref) {
+        av_freep(&data);
+        return NULL;
+    }
+
+    req = (V4L2RequestDescriptor*)data;
+    req->request_fd = -1;
+    req->output.fd = -1;
+    req->capture.fd = -1;
+
+    ret = v4l2_request_buffer_alloc(avctx, &req->output, ctx->output_type);
+    if (ret < 0) {
+        av_buffer_unref(&ref);
+        return NULL;
+    }
+
+    ret = v4l2_request_buffer_alloc(avctx, &req->capture, ctx->format.type);
+    if (ret < 0) {
+        av_buffer_unref(&ref);
+        return NULL;
+    }
+
+    ret = ioctl(ctx->media_fd, MEDIA_IOC_REQUEST_ALLOC, &req->request_fd);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "%s: request alloc failed, %s (%d)\n", __func__, strerror(errno), errno);
+        av_buffer_unref(&ref);
+        return NULL;
+    }
+
+    av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p size=%d data=%p request_fd=%d\n", __func__, avctx, size, data, req->request_fd);
+    return ref;
+}
+
+static void v4l2_request_pool_free(void *opaque)
+{
+    av_log(NULL, AV_LOG_DEBUG, "%s: opaque=%p\n", __func__, opaque);
+}
+
+static void v4l2_request_hwframe_ctx_free(AVHWFramesContext *hwfc)
+{
+    av_log(NULL, AV_LOG_DEBUG, "%s: hwfc=%p pool=%p\n", __func__, hwfc, hwfc->pool);
+
+    av_buffer_pool_flush(hwfc->pool);
+    av_buffer_pool_uninit(&hwfc->pool);
+}
+
+int ff_v4l2_request_frame_params(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    AVHWFramesContext *hwfc = (AVHWFramesContext*)hw_frames_ctx->data;
+
+    hwfc->format = AV_PIX_FMT_DRM_PRIME;
+    hwfc->sw_format = AV_PIX_FMT_NV12;
+    if (V4L2_TYPE_IS_MULTIPLANAR(ctx->format.type)) {
+        hwfc->width = ctx->format.fmt.pix_mp.width;
+        hwfc->height = ctx->format.fmt.pix_mp.height;
+    } else {
+        hwfc->width = ctx->format.fmt.pix.width;
+        hwfc->height = ctx->format.fmt.pix.height;
+    }
+
+    hwfc->pool = av_buffer_pool_init2(sizeof(V4L2RequestDescriptor), avctx, v4l2_request_frame_alloc, v4l2_request_pool_free);
+    if (!hwfc->pool)
+        return AVERROR(ENOMEM);
+
+    hwfc->free = v4l2_request_hwframe_ctx_free;
+
+    hwfc->initial_pool_size = 1;
+
+    switch (avctx->codec_id) {
+    case AV_CODEC_ID_VP9:
+        hwfc->initial_pool_size += 8;
+        break;
+    case AV_CODEC_ID_VP8:
+        hwfc->initial_pool_size += 3;
+        break;
+    default:
+        hwfc->initial_pool_size += 2;
+    }
+
+    av_log(avctx, AV_LOG_DEBUG, "%s: avctx=%p ctx=%p hw_frames_ctx=%p hwfc=%p pool=%p width=%d height=%d initial_pool_size=%d\n", __func__, avctx, ctx, hw_frames_ctx, hwfc, hwfc->pool, hwfc->width, hwfc->height, hwfc->initial_pool_size);
+
+    return 0;
+}
diff --git a/libavcodec/v4l2_request.h b/libavcodec/v4l2_request.h
new file mode 100644
index 00000000000..58d2aa70af8
--- /dev/null
+++ b/libavcodec/v4l2_request.h
@@ -0,0 +1,77 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_V4L2_REQUEST_H
+#define AVCODEC_V4L2_REQUEST_H
+
+#include <linux/videodev2.h>
+
+#include "libavutil/hwcontext_drm.h"
+
+typedef struct V4L2RequestContext {
+    int video_fd;
+    int media_fd;
+    enum v4l2_buf_type output_type;
+    struct v4l2_format format;
+    int timestamp;
+} V4L2RequestContext;
+
+typedef struct V4L2RequestBuffer {
+    int index;
+    int fd;
+    uint8_t *addr;
+    uint32_t width;
+    uint32_t height;
+    uint32_t size;
+    uint32_t used;
+    uint32_t capabilities;
+    struct v4l2_buffer buffer;
+} V4L2RequestBuffer;
+
+typedef struct V4L2RequestDescriptor {
+    AVDRMFrameDescriptor drm;
+    int request_fd;
+    V4L2RequestBuffer output;
+    V4L2RequestBuffer capture;
+} V4L2RequestDescriptor;
+
+uint64_t ff_v4l2_request_get_capture_timestamp(AVFrame *frame);
+
+int ff_v4l2_request_reset_frame(AVCodecContext *avctx, AVFrame *frame);
+
+int ff_v4l2_request_append_output_buffer(AVCodecContext *avctx, AVFrame *frame, const uint8_t *data, uint32_t size);
+
+int ff_v4l2_request_set_controls(AVCodecContext *avctx, struct v4l2_ext_control *control, int count);
+
+int ff_v4l2_request_get_controls(AVCodecContext *avctx, struct v4l2_ext_control *control, int count);
+
+int ff_v4l2_request_query_control(AVCodecContext *avctx, struct v4l2_query_ext_ctrl *control);
+
+int ff_v4l2_request_query_control_default_value(AVCodecContext *avctx, uint32_t id);
+
+int ff_v4l2_request_decode_slice(AVCodecContext *avctx, AVFrame *frame, struct v4l2_ext_control *control, int count, int first_slice, int last_slice);
+
+int ff_v4l2_request_decode_frame(AVCodecContext *avctx, AVFrame *frame, struct v4l2_ext_control *control, int count);
+
+int ff_v4l2_request_init(AVCodecContext *avctx, uint32_t pixelformat, uint32_t buffersize, struct v4l2_ext_control *control, int count);
+
+int ff_v4l2_request_uninit(AVCodecContext *avctx);
+
+int ff_v4l2_request_frame_params(AVCodecContext *avctx, AVBufferRef *hw_frames_ctx);
+
+#endif /* AVCODEC_V4L2_REQUEST_H */

From e432d3151f4c5507e40fb1fe8b3c3fb7c7a0a08c Mon Sep 17 00:00:00 2001
From: Ezequiel Garcia <ezequiel@collabora.com>
Date: Wed, 20 Feb 2019 11:18:00 -0300
Subject: [PATCH 03/17] h264dec: add idr_pic_id to slice context

Used by V4L2 request API h264 hwaccel

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
 libavcodec/h264_slice.c | 2 +-
 libavcodec/h264dec.h    | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c
index 2d0605c7f4f..c3a7338a704 100644
--- a/libavcodec/h264_slice.c
+++ b/libavcodec/h264_slice.c
@@ -1830,7 +1830,7 @@ static int h264_slice_header_parse(const H264Context *h, H264SliceContext *sl,
     }
 
     if (nal->type == H264_NAL_IDR_SLICE)
-        get_ue_golomb_long(&sl->gb); /* idr_pic_id */
+        sl->idr_pic_id = get_ue_golomb_long(&sl->gb);
 
     sl->poc_lsb = 0;
     sl->delta_poc_bottom = 0;
diff --git a/libavcodec/h264dec.h b/libavcodec/h264dec.h
index b7b19ba4f16..0698ab95ba5 100644
--- a/libavcodec/h264dec.h
+++ b/libavcodec/h264dec.h
@@ -336,6 +336,7 @@ typedef struct H264SliceContext {
     int delta_poc[2];
     int curr_pic_num;
     int max_pic_num;
+    int idr_pic_id;
 } H264SliceContext;
 
 /**

From 84564d13ec0ec40f408622ff6b0d900723bbab5b Mon Sep 17 00:00:00 2001
From: Boris Brezillon <boris.brezillon@collabora.com>
Date: Wed, 22 May 2019 14:44:22 +0200
Subject: [PATCH 04/17] h264dec: add ref_pic_marking and pic_order_cnt bit_size
 to slice context

Used by V4L2 request API h264 hwaccel

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
 libavcodec/h264_slice.c | 6 +++++-
 libavcodec/h264dec.h    | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c
index c3a7338a704..c28b58cd5d9 100644
--- a/libavcodec/h264_slice.c
+++ b/libavcodec/h264_slice.c
@@ -1748,7 +1748,7 @@ static int h264_slice_header_parse(const H264Context *h, H264SliceContext *sl,
     unsigned int slice_type, tmp, i;
     int field_pic_flag, bottom_field_flag;
     int first_slice = sl == h->slice_ctx && !h->current_slice;
-    int picture_structure;
+    int picture_structure, pos;
 
     if (first_slice)
         av_assert0(!h->setup_finished);
@@ -1832,6 +1832,7 @@ static int h264_slice_header_parse(const H264Context *h, H264SliceContext *sl,
     if (nal->type == H264_NAL_IDR_SLICE)
         sl->idr_pic_id = get_ue_golomb_long(&sl->gb);
 
+    pos = sl->gb.index;
     sl->poc_lsb = 0;
     sl->delta_poc_bottom = 0;
     if (sps->poc_type == 0) {
@@ -1845,6 +1846,7 @@ static int h264_slice_header_parse(const H264Context *h, H264SliceContext *sl,
         if (pps->pic_order_present == 1 && picture_structure == PICT_FRAME)
             sl->delta_poc[1] = get_se_golomb(&sl->gb);
     }
+    sl->pic_order_cnt_bit_size = sl->gb.index - pos;
 
     sl->redundant_pic_count = 0;
     if (pps->redundant_pic_cnt_present)
@@ -1884,9 +1886,11 @@ static int h264_slice_header_parse(const H264Context *h, H264SliceContext *sl,
 
     sl->explicit_ref_marking = 0;
     if (nal->ref_idc) {
+        pos = sl->gb.index;
         ret = ff_h264_decode_ref_pic_marking(sl, &sl->gb, nal, h->avctx);
         if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE))
             return AVERROR_INVALIDDATA;
+        sl->ref_pic_marking_bit_size = sl->gb.index - pos;
     }
 
     if (sl->slice_type_nos != AV_PICTURE_TYPE_I && pps->cabac) {
diff --git a/libavcodec/h264dec.h b/libavcodec/h264dec.h
index 0698ab95ba5..2b39e82c3b0 100644
--- a/libavcodec/h264dec.h
+++ b/libavcodec/h264dec.h
@@ -329,6 +329,7 @@ typedef struct H264SliceContext {
     MMCO mmco[MAX_MMCO_COUNT];
     int  nb_mmco;
     int explicit_ref_marking;
+    int ref_pic_marking_bit_size;
 
     int frame_num;
     int poc_lsb;
@@ -337,6 +338,7 @@ typedef struct H264SliceContext {
     int curr_pic_num;
     int max_pic_num;
     int idr_pic_id;
+    int pic_order_cnt_bit_size;
 } H264SliceContext;
 
 /**

From 5a8628cf6368fe18457d02bf551d5935609efab5 Mon Sep 17 00:00:00 2001
From: Jernej Skrabec <jernej.skrabec@siol.net>
Date: Sat, 15 Dec 2018 22:32:16 +0100
Subject: [PATCH 05/17] Add V4L2 request API h264 hwaccel

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
 configure                      |   3 +
 libavcodec/Makefile            |   1 +
 libavcodec/h264_slice.c        |   4 +
 libavcodec/h264dec.c           |   3 +
 libavcodec/hwaccels.h          |   1 +
 libavcodec/v4l2_request_h264.c | 456 +++++++++++++++++++++++++++++++++
 6 files changed, 468 insertions(+)
 create mode 100644 libavcodec/v4l2_request_h264.c

diff --git a/configure b/configure
index f2e203d1346..b17e4108c1b 100755
--- a/configure
+++ b/configure
@@ -2951,6 +2951,8 @@ h264_dxva2_hwaccel_deps="dxva2"
 h264_dxva2_hwaccel_select="h264_decoder"
 h264_nvdec_hwaccel_deps="nvdec"
 h264_nvdec_hwaccel_select="h264_decoder"
+h264_v4l2request_hwaccel_deps="v4l2_request h264_v4l2_request"
+h264_v4l2request_hwaccel_select="h264_decoder"
 h264_vaapi_hwaccel_deps="vaapi"
 h264_vaapi_hwaccel_select="h264_decoder"
 h264_vdpau_hwaccel_deps="vdpau"
@@ -6628,6 +6630,7 @@ if enabled v4l2_m2m; then
 fi
 
 check_func_headers "linux/media.h linux/videodev2.h" v4l2_timeval_to_ns
+check_cc h264_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_H264_SLICE;"
 
 check_headers sys/videoio.h
 test_code cc sys/videoio.h "struct v4l2_frmsizeenum vfse; vfse.discrete.width = 0;" && enable_sanitized struct_v4l2_frmivalenum_discrete
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 90dfffcb200..426c7528e90 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -935,6 +935,7 @@ OBJS-$(CONFIG_H264_D3D11VA_HWACCEL)       += dxva2_h264.o
 OBJS-$(CONFIG_H264_DXVA2_HWACCEL)         += dxva2_h264.o
 OBJS-$(CONFIG_H264_NVDEC_HWACCEL)         += nvdec_h264.o
 OBJS-$(CONFIG_H264_QSV_HWACCEL)           += qsvdec.o
+OBJS-$(CONFIG_H264_V4L2REQUEST_HWACCEL)   += v4l2_request_h264.o
 OBJS-$(CONFIG_H264_VAAPI_HWACCEL)         += vaapi_h264.o
 OBJS-$(CONFIG_H264_VDPAU_HWACCEL)         += vdpau_h264.o
 OBJS-$(CONFIG_H264_VIDEOTOOLBOX_HWACCEL)  += videotoolbox.o
diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c
index c28b58cd5d9..0a10d00aad9 100644
--- a/libavcodec/h264_slice.c
+++ b/libavcodec/h264_slice.c
@@ -768,6 +768,7 @@ static enum AVPixelFormat get_pixel_format(H264Context *h, int force_callback)
 #define HWACCEL_MAX (CONFIG_H264_DXVA2_HWACCEL + \
                      (CONFIG_H264_D3D11VA_HWACCEL * 2) + \
                      CONFIG_H264_NVDEC_HWACCEL + \
+                     CONFIG_H264_V4L2REQUEST_HWACCEL + \
                      CONFIG_H264_VAAPI_HWACCEL + \
                      CONFIG_H264_VIDEOTOOLBOX_HWACCEL + \
                      CONFIG_H264_VDPAU_HWACCEL)
@@ -852,6 +853,9 @@ static enum AVPixelFormat get_pixel_format(H264Context *h, int force_callback)
 #endif
 #if CONFIG_H264_VIDEOTOOLBOX_HWACCEL
             *fmt++ = AV_PIX_FMT_VIDEOTOOLBOX;
+#endif
+#if CONFIG_H264_V4L2REQUEST_HWACCEL
+            *fmt++ = AV_PIX_FMT_DRM_PRIME;
 #endif
             if (h->avctx->codec->pix_fmts)
                 choices = h->avctx->codec->pix_fmts;
diff --git a/libavcodec/h264dec.c b/libavcodec/h264dec.c
index 0a999bef43d..d78e3eaee3a 100644
--- a/libavcodec/h264dec.c
+++ b/libavcodec/h264dec.c
@@ -1076,6 +1076,9 @@ AVCodec ff_h264_decoder = {
 #endif
 #if CONFIG_H264_VIDEOTOOLBOX_HWACCEL
                                HWACCEL_VIDEOTOOLBOX(h264),
+#endif
+#if CONFIG_H264_V4L2REQUEST_HWACCEL
+                               HWACCEL_V4L2REQUEST(h264),
 #endif
                                NULL
                            },
diff --git a/libavcodec/hwaccels.h b/libavcodec/hwaccels.h
index 8e54cf73f90..969a1da0f4b 100644
--- a/libavcodec/hwaccels.h
+++ b/libavcodec/hwaccels.h
@@ -32,6 +32,7 @@ extern const AVHWAccel ff_h264_d3d11va_hwaccel;
 extern const AVHWAccel ff_h264_d3d11va2_hwaccel;
 extern const AVHWAccel ff_h264_dxva2_hwaccel;
 extern const AVHWAccel ff_h264_nvdec_hwaccel;
+extern const AVHWAccel ff_h264_v4l2request_hwaccel;
 extern const AVHWAccel ff_h264_vaapi_hwaccel;
 extern const AVHWAccel ff_h264_vdpau_hwaccel;
 extern const AVHWAccel ff_h264_videotoolbox_hwaccel;
diff --git a/libavcodec/v4l2_request_h264.c b/libavcodec/v4l2_request_h264.c
new file mode 100644
index 00000000000..88da8f0a2db
--- /dev/null
+++ b/libavcodec/v4l2_request_h264.c
@@ -0,0 +1,456 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "h264dec.h"
+#include "hwconfig.h"
+#include "v4l2_request.h"
+
+typedef struct V4L2RequestControlsH264 {
+    struct v4l2_ctrl_h264_sps sps;
+    struct v4l2_ctrl_h264_pps pps;
+    struct v4l2_ctrl_h264_scaling_matrix scaling_matrix;
+    struct v4l2_ctrl_h264_decode_params decode_params;
+    struct v4l2_ctrl_h264_slice_params slice_params;
+    struct v4l2_ctrl_h264_pred_weights pred_weights;
+    int pred_weights_required;
+    int first_slice;
+    int num_slices;
+} V4L2RequestControlsH264;
+
+typedef struct V4L2RequestContextH264 {
+    V4L2RequestContext base;
+    int decode_mode;
+    int start_code;
+} V4L2RequestContextH264;
+
+static uint8_t nalu_slice_start_code[] = { 0x00, 0x00, 0x01 };
+
+static void fill_weight_factors(struct v4l2_h264_weight_factors *factors, int list, const H264SliceContext *sl)
+{
+    for (int i = 0; i < sl->ref_count[list]; i++) {
+        if (sl->pwt.luma_weight_flag[list]) {
+            factors->luma_weight[i] = sl->pwt.luma_weight[i][list][0];
+            factors->luma_offset[i] = sl->pwt.luma_weight[i][list][1];
+        } else {
+            factors->luma_weight[i] = 1 << sl->pwt.luma_log2_weight_denom;
+            factors->luma_offset[i] = 0;
+        }
+        for (int j = 0; j < 2; j++) {
+            if (sl->pwt.chroma_weight_flag[list]) {
+                factors->chroma_weight[i][j] = sl->pwt.chroma_weight[i][list][j][0];
+                factors->chroma_offset[i][j] = sl->pwt.chroma_weight[i][list][j][1];
+            } else {
+                factors->chroma_weight[i][j] = 1 << sl->pwt.chroma_log2_weight_denom;
+                factors->chroma_offset[i][j] = 0;
+            }
+        }
+    }
+}
+
+static void fill_dpb_entry(struct v4l2_h264_dpb_entry *entry, const H264Picture *pic)
+{
+    entry->reference_ts = ff_v4l2_request_get_capture_timestamp(pic->f);
+    entry->pic_num = pic->pic_id;
+    entry->frame_num = pic->frame_num;
+    entry->fields = pic->reference & V4L2_H264_FRAME_REF;
+    entry->flags = V4L2_H264_DPB_ENTRY_FLAG_VALID;
+    if (entry->fields)
+        entry->flags |= V4L2_H264_DPB_ENTRY_FLAG_ACTIVE;
+    if (pic->long_ref)
+        entry->flags |= V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM;
+    if (pic->field_picture)
+        entry->flags |= V4L2_H264_DPB_ENTRY_FLAG_FIELD;
+    if (pic->field_poc[0] != INT_MAX)
+        entry->top_field_order_cnt = pic->field_poc[0];
+    if (pic->field_poc[1] != INT_MAX)
+        entry->bottom_field_order_cnt = pic->field_poc[1];
+}
+
+static void fill_dpb(struct v4l2_ctrl_h264_decode_params *decode, const H264Context *h)
+{
+    int entries = 0;
+
+    for (int i = 0; i < h->short_ref_count; i++) {
+        const H264Picture *pic = h->short_ref[i];
+        if (pic && (pic->field_poc[0] != INT_MAX || pic->field_poc[1] != INT_MAX))
+            fill_dpb_entry(&decode->dpb[entries++], pic);
+    }
+
+    if (!h->long_ref_count)
+        return;
+
+    for (int i = 0; i < FF_ARRAY_ELEMS(h->long_ref); i++) {
+        const H264Picture *pic = h->long_ref[i];
+        if (pic && (pic->field_poc[0] != INT_MAX || pic->field_poc[1] != INT_MAX))
+            fill_dpb_entry(&decode->dpb[entries++], pic);
+    }
+}
+
+static void fill_ref_list(struct v4l2_h264_reference *reference, struct v4l2_ctrl_h264_decode_params *decode, const H264Ref *ref)
+{
+    uint64_t timestamp;
+
+    if (!ref->parent)
+        return;
+
+    timestamp = ff_v4l2_request_get_capture_timestamp(ref->parent->f);
+
+    for (uint8_t i = 0; i < FF_ARRAY_ELEMS(decode->dpb); i++) {
+        struct v4l2_h264_dpb_entry *entry = &decode->dpb[i];
+        if ((entry->flags & V4L2_H264_DPB_ENTRY_FLAG_VALID) &&
+            entry->reference_ts == timestamp) {
+            reference->fields = ref->reference & V4L2_H264_FRAME_REF;
+            reference->index = i;
+            return;
+        }
+    }
+}
+
+static void fill_sps(struct v4l2_ctrl_h264_sps *ctrl, const H264Context *h)
+{
+    const SPS *sps = h->ps.sps;
+
+    *ctrl = (struct v4l2_ctrl_h264_sps) {
+        .profile_idc = sps->profile_idc,
+        .constraint_set_flags = sps->constraint_set_flags,
+        .level_idc = sps->level_idc,
+        .seq_parameter_set_id = sps->sps_id,
+        .chroma_format_idc = sps->chroma_format_idc,
+        .bit_depth_luma_minus8 = sps->bit_depth_luma - 8,
+        .bit_depth_chroma_minus8 = sps->bit_depth_chroma - 8,
+        .log2_max_frame_num_minus4 = sps->log2_max_frame_num - 4,
+        .pic_order_cnt_type = sps->poc_type,
+        .log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4,
+        .max_num_ref_frames = sps->ref_frame_count,
+        .num_ref_frames_in_pic_order_cnt_cycle = sps->poc_cycle_length,
+        .offset_for_non_ref_pic = sps->offset_for_non_ref_pic,
+        .offset_for_top_to_bottom_field = sps->offset_for_top_to_bottom_field,
+        .pic_width_in_mbs_minus1 = h->mb_width - 1,
+        .pic_height_in_map_units_minus1 = sps->frame_mbs_only_flag ? h->mb_height - 1 : h->mb_height / 2 - 1,
+    };
+
+    if (sps->poc_cycle_length > 0 && sps->poc_cycle_length <= 255)
+        memcpy(ctrl->offset_for_ref_frame, sps->offset_for_ref_frame, sps->poc_cycle_length * sizeof(ctrl->offset_for_ref_frame[0]));
+
+    if (sps->residual_color_transform_flag)
+        ctrl->flags |= V4L2_H264_SPS_FLAG_SEPARATE_COLOUR_PLANE;
+    if (sps->transform_bypass)
+        ctrl->flags |= V4L2_H264_SPS_FLAG_QPPRIME_Y_ZERO_TRANSFORM_BYPASS;
+    if (sps->delta_pic_order_always_zero_flag)
+        ctrl->flags |= V4L2_H264_SPS_FLAG_DELTA_PIC_ORDER_ALWAYS_ZERO;
+    if (sps->gaps_in_frame_num_allowed_flag)
+        ctrl->flags |= V4L2_H264_SPS_FLAG_GAPS_IN_FRAME_NUM_VALUE_ALLOWED;
+    if (sps->frame_mbs_only_flag)
+        ctrl->flags |= V4L2_H264_SPS_FLAG_FRAME_MBS_ONLY;
+    if (sps->mb_aff)
+        ctrl->flags |= V4L2_H264_SPS_FLAG_MB_ADAPTIVE_FRAME_FIELD;
+    if (sps->direct_8x8_inference_flag)
+        ctrl->flags |= V4L2_H264_SPS_FLAG_DIRECT_8X8_INFERENCE;
+}
+
+static void fill_pps(struct v4l2_ctrl_h264_pps *ctrl, const H264Context *h)
+{
+    const SPS *sps = h->ps.sps;
+    const PPS *pps = h->ps.pps;
+    const H264SliceContext *sl = &h->slice_ctx[0];
+    int qp_bd_offset = 6 * (sps->bit_depth_luma - 8);
+
+    *ctrl = (struct v4l2_ctrl_h264_pps) {
+        .pic_parameter_set_id = sl->pps_id,
+        .seq_parameter_set_id = pps->sps_id,
+        .num_slice_groups_minus1 = pps->slice_group_count - 1,
+        .num_ref_idx_l0_default_active_minus1 = pps->ref_count[0] - 1,
+        .num_ref_idx_l1_default_active_minus1 = pps->ref_count[1] - 1,
+        .weighted_bipred_idc = pps->weighted_bipred_idc,
+        .pic_init_qp_minus26 = pps->init_qp - 26 - qp_bd_offset,
+        .pic_init_qs_minus26 = pps->init_qs - 26 - qp_bd_offset,
+        .chroma_qp_index_offset = pps->chroma_qp_index_offset[0],
+        .second_chroma_qp_index_offset = pps->chroma_qp_index_offset[1],
+    };
+
+    if (pps->cabac)
+        ctrl->flags |= V4L2_H264_PPS_FLAG_ENTROPY_CODING_MODE;
+    if (pps->pic_order_present)
+        ctrl->flags |= V4L2_H264_PPS_FLAG_BOTTOM_FIELD_PIC_ORDER_IN_FRAME_PRESENT;
+    if (pps->weighted_pred)
+        ctrl->flags |= V4L2_H264_PPS_FLAG_WEIGHTED_PRED;
+    if (pps->deblocking_filter_parameters_present)
+        ctrl->flags |= V4L2_H264_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT;
+    if (pps->constrained_intra_pred)
+        ctrl->flags |= V4L2_H264_PPS_FLAG_CONSTRAINED_INTRA_PRED;
+    if (pps->redundant_pic_cnt_present)
+        ctrl->flags |= V4L2_H264_PPS_FLAG_REDUNDANT_PIC_CNT_PRESENT;
+    if (pps->transform_8x8_mode)
+        ctrl->flags |= V4L2_H264_PPS_FLAG_TRANSFORM_8X8_MODE;
+
+    /* FFmpeg always provide a scaling matrix */
+    ctrl->flags |= V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT;
+}
+
+static int v4l2_request_h264_start_frame(AVCodecContext *avctx,
+                                         av_unused const uint8_t *buffer,
+                                         av_unused uint32_t size)
+{
+    const H264Context *h = avctx->priv_data;
+    const PPS *pps = h->ps.pps;
+    const SPS *sps = h->ps.sps;
+    const H264SliceContext *sl = &h->slice_ctx[0];
+    V4L2RequestControlsH264 *controls = h->cur_pic_ptr->hwaccel_picture_private;
+
+    fill_sps(&controls->sps, h);
+    fill_pps(&controls->pps, h);
+
+    memcpy(controls->scaling_matrix.scaling_list_4x4, pps->scaling_matrix4, sizeof(controls->scaling_matrix.scaling_list_4x4));
+    memcpy(controls->scaling_matrix.scaling_list_8x8[0], pps->scaling_matrix8[0], sizeof(controls->scaling_matrix.scaling_list_8x8[0]));
+    memcpy(controls->scaling_matrix.scaling_list_8x8[1], pps->scaling_matrix8[3], sizeof(controls->scaling_matrix.scaling_list_8x8[1]));
+
+    if (sps->chroma_format_idc == 3) {
+        memcpy(controls->scaling_matrix.scaling_list_8x8[2], pps->scaling_matrix8[1], sizeof(controls->scaling_matrix.scaling_list_8x8[2]));
+        memcpy(controls->scaling_matrix.scaling_list_8x8[3], pps->scaling_matrix8[4], sizeof(controls->scaling_matrix.scaling_list_8x8[3]));
+        memcpy(controls->scaling_matrix.scaling_list_8x8[4], pps->scaling_matrix8[2], sizeof(controls->scaling_matrix.scaling_list_8x8[4]));
+        memcpy(controls->scaling_matrix.scaling_list_8x8[5], pps->scaling_matrix8[5], sizeof(controls->scaling_matrix.scaling_list_8x8[5]));
+    }
+
+    controls->decode_params = (struct v4l2_ctrl_h264_decode_params) {
+        .nal_ref_idc = h->nal_ref_idc,
+        .frame_num = h->poc.frame_num,
+        .top_field_order_cnt = h->cur_pic_ptr->field_poc[0] != INT_MAX ? h->cur_pic_ptr->field_poc[0] : 0,
+        .bottom_field_order_cnt = h->cur_pic_ptr->field_poc[1] != INT_MAX ? h->cur_pic_ptr->field_poc[1] : 0,
+        .idr_pic_id = sl->idr_pic_id,
+        .pic_order_cnt_lsb = sl->poc_lsb,
+        .delta_pic_order_cnt_bottom = sl->delta_poc_bottom,
+        .delta_pic_order_cnt0 = sl->delta_poc[0],
+        .delta_pic_order_cnt1 = sl->delta_poc[1],
+        /* Size in bits of dec_ref_pic_marking() syntax element. */
+        .dec_ref_pic_marking_bit_size = sl->ref_pic_marking_bit_size,
+        /* Size in bits of pic order count syntax. */
+        .pic_order_cnt_bit_size = sl->pic_order_cnt_bit_size,
+        .slice_group_change_cycle = 0, /* slice group not supported by FFmpeg */
+    };
+
+    if (h->picture_idr)
+        controls->decode_params.flags |= V4L2_H264_DECODE_PARAM_FLAG_IDR_PIC;
+    if (FIELD_PICTURE(h))
+        controls->decode_params.flags |= V4L2_H264_DECODE_PARAM_FLAG_FIELD_PIC;
+    if (h->picture_structure == PICT_BOTTOM_FIELD)
+        controls->decode_params.flags |= V4L2_H264_DECODE_PARAM_FLAG_BOTTOM_FIELD;
+
+    fill_dpb(&controls->decode_params, h);
+
+    controls->first_slice = !FIELD_PICTURE(h) || h->first_field;
+    controls->num_slices = 0;
+
+    return ff_v4l2_request_reset_frame(avctx, h->cur_pic_ptr->f);
+}
+
+static int v4l2_request_h264_queue_decode(AVCodecContext *avctx, int last_slice)
+{
+    const H264Context *h = avctx->priv_data;
+    V4L2RequestControlsH264 *controls = h->cur_pic_ptr->hwaccel_picture_private;
+    V4L2RequestContextH264 *ctx = avctx->internal->hwaccel_priv_data;
+
+    struct v4l2_ext_control control[] = {
+        {
+            .id = V4L2_CID_STATELESS_H264_SPS,
+            .ptr = &controls->sps,
+            .size = sizeof(controls->sps),
+        },
+        {
+            .id = V4L2_CID_STATELESS_H264_PPS,
+            .ptr = &controls->pps,
+            .size = sizeof(controls->pps),
+        },
+        {
+            .id = V4L2_CID_STATELESS_H264_SCALING_MATRIX,
+            .ptr = &controls->scaling_matrix,
+            .size = sizeof(controls->scaling_matrix),
+        },
+        {
+            .id = V4L2_CID_STATELESS_H264_DECODE_PARAMS,
+            .ptr = &controls->decode_params,
+            .size = sizeof(controls->decode_params),
+        },
+        {
+            .id = V4L2_CID_STATELESS_H264_SLICE_PARAMS,
+            .ptr = &controls->slice_params,
+            .size = sizeof(controls->slice_params),
+        },
+        {
+            .id = V4L2_CID_STATELESS_H264_PRED_WEIGHTS,
+            .ptr = &controls->pred_weights,
+            .size = sizeof(controls->pred_weights),
+        },
+    };
+
+    if (ctx->decode_mode == V4L2_STATELESS_H264_DECODE_MODE_SLICE_BASED) {
+        int count = FF_ARRAY_ELEMS(control) - (controls->pred_weights_required ? 0 : 1);
+        return ff_v4l2_request_decode_slice(avctx, h->cur_pic_ptr->f, control, count, controls->first_slice, last_slice);
+    }
+
+    return ff_v4l2_request_decode_frame(avctx, h->cur_pic_ptr->f, control, FF_ARRAY_ELEMS(control) - 2);
+}
+
+static int v4l2_request_h264_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
+{
+    const H264Context *h = avctx->priv_data;
+    const PPS *pps = h->ps.pps;
+    const H264SliceContext *sl = &h->slice_ctx[0];
+    V4L2RequestControlsH264 *controls = h->cur_pic_ptr->hwaccel_picture_private;
+    V4L2RequestContextH264 *ctx = avctx->internal->hwaccel_priv_data;
+    int i, ret, count;
+
+    if (ctx->decode_mode == V4L2_STATELESS_H264_DECODE_MODE_SLICE_BASED && controls->num_slices) {
+        ret = v4l2_request_h264_queue_decode(avctx, 0);
+        if (ret)
+            return ret;
+
+        ff_v4l2_request_reset_frame(avctx, h->cur_pic_ptr->f);
+        controls->first_slice = 0;
+    }
+
+    if (ctx->start_code == V4L2_STATELESS_H264_START_CODE_ANNEX_B) {
+        ret = ff_v4l2_request_append_output_buffer(avctx, h->cur_pic_ptr->f, nalu_slice_start_code, 3);
+        if (ret)
+            return ret;
+    }
+
+    ret = ff_v4l2_request_append_output_buffer(avctx, h->cur_pic_ptr->f, buffer, size);
+    if (ret)
+        return ret;
+
+    if (ctx->decode_mode != V4L2_STATELESS_H264_DECODE_MODE_SLICE_BASED)
+        return 0;
+
+    controls->slice_params = (struct v4l2_ctrl_h264_slice_params) {
+        /* Offset in bits to slice_data() from the beginning of this slice. */
+        .header_bit_size = get_bits_count(&sl->gb),
+
+        .first_mb_in_slice = sl->first_mb_addr,
+
+        .slice_type = ff_h264_get_slice_type(sl),
+        .colour_plane_id = 0, /* separate colour plane not supported by FFmpeg */
+        .redundant_pic_cnt = sl->redundant_pic_count,
+        .cabac_init_idc = sl->cabac_init_idc,
+        .slice_qp_delta = sl->qscale - pps->init_qp,
+        .slice_qs_delta = 0, /* not implemented by FFmpeg */
+        .disable_deblocking_filter_idc = sl->deblocking_filter < 2 ? !sl->deblocking_filter : sl->deblocking_filter,
+        .slice_alpha_c0_offset_div2 = sl->slice_alpha_c0_offset / 2,
+        .slice_beta_offset_div2 = sl->slice_beta_offset / 2,
+        .num_ref_idx_l0_active_minus1 = sl->list_count > 0 ? sl->ref_count[0] - 1 : 0,
+        .num_ref_idx_l1_active_minus1 = sl->list_count > 1 ? sl->ref_count[1] - 1 : 0,
+    };
+
+    if (sl->slice_type == AV_PICTURE_TYPE_B && sl->direct_spatial_mv_pred)
+        controls->slice_params.flags |= V4L2_H264_SLICE_FLAG_DIRECT_SPATIAL_MV_PRED;
+    /* V4L2_H264_SLICE_FLAG_SP_FOR_SWITCH: not implemented by FFmpeg */
+
+    controls->pred_weights_required = V4L2_H264_CTRL_PRED_WEIGHTS_REQUIRED(&controls->pps, &controls->slice_params);
+    if (controls->pred_weights_required) {
+        controls->pred_weights.chroma_log2_weight_denom = sl->pwt.chroma_log2_weight_denom;
+        controls->pred_weights.luma_log2_weight_denom = sl->pwt.luma_log2_weight_denom;
+    }
+
+    count = sl->list_count > 0 ? sl->ref_count[0] : 0;
+    for (i = 0; i < count; i++)
+        fill_ref_list(&controls->slice_params.ref_pic_list0[i], &controls->decode_params, &sl->ref_list[0][i]);
+    if (count && controls->pred_weights_required)
+        fill_weight_factors(&controls->pred_weights.weight_factors[0], 0, sl);
+
+    count = sl->list_count > 1 ? sl->ref_count[1] : 0;
+    for (i = 0; i < count; i++)
+        fill_ref_list(&controls->slice_params.ref_pic_list1[i], &controls->decode_params, &sl->ref_list[1][i]);
+    if (count && controls->pred_weights_required)
+        fill_weight_factors(&controls->pred_weights.weight_factors[1], 1, sl);
+
+    controls->num_slices++;
+    return 0;
+}
+
+static int v4l2_request_h264_end_frame(AVCodecContext *avctx)
+{
+    const H264Context *h = avctx->priv_data;
+    return v4l2_request_h264_queue_decode(avctx, !FIELD_PICTURE(h) || !h->first_field);
+}
+
+static int v4l2_request_h264_set_controls(AVCodecContext *avctx)
+{
+    V4L2RequestContextH264 *ctx = avctx->internal->hwaccel_priv_data;
+
+    struct v4l2_ext_control control[] = {
+        { .id = V4L2_CID_STATELESS_H264_DECODE_MODE, },
+        { .id = V4L2_CID_STATELESS_H264_START_CODE, },
+    };
+
+    ctx->decode_mode = ff_v4l2_request_query_control_default_value(avctx, V4L2_CID_STATELESS_H264_DECODE_MODE);
+    if (ctx->decode_mode != V4L2_STATELESS_H264_DECODE_MODE_SLICE_BASED &&
+        ctx->decode_mode != V4L2_STATELESS_H264_DECODE_MODE_FRAME_BASED) {
+        av_log(avctx, AV_LOG_ERROR, "%s: unsupported decode mode, %d\n", __func__, ctx->decode_mode);
+        return AVERROR(EINVAL);
+    }
+
+    ctx->start_code = ff_v4l2_request_query_control_default_value(avctx, V4L2_CID_STATELESS_H264_START_CODE);
+    if (ctx->start_code != V4L2_STATELESS_H264_START_CODE_NONE &&
+        ctx->start_code != V4L2_STATELESS_H264_START_CODE_ANNEX_B) {
+        av_log(avctx, AV_LOG_ERROR, "%s: unsupported start code, %d\n", __func__, ctx->start_code);
+        return AVERROR(EINVAL);
+    }
+
+    control[0].value = ctx->decode_mode;
+    control[1].value = ctx->start_code;
+
+    return ff_v4l2_request_set_controls(avctx, control, FF_ARRAY_ELEMS(control));
+}
+
+static int v4l2_request_h264_init(AVCodecContext *avctx)
+{
+    const H264Context *h = avctx->priv_data;
+    struct v4l2_ctrl_h264_sps sps;
+    int ret;
+
+    struct v4l2_ext_control control[] = {
+        {
+            .id = V4L2_CID_STATELESS_H264_SPS,
+            .ptr = &sps,
+            .size = sizeof(sps),
+        },
+    };
+
+    fill_sps(&sps, h);
+
+    ret = ff_v4l2_request_init(avctx, V4L2_PIX_FMT_H264_SLICE, 4 * 1024 * 1024, control, FF_ARRAY_ELEMS(control));
+    if (ret)
+        return ret;
+
+    return v4l2_request_h264_set_controls(avctx);
+}
+
+const AVHWAccel ff_h264_v4l2request_hwaccel = {
+    .name           = "h264_v4l2request",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_H264,
+    .pix_fmt        = AV_PIX_FMT_DRM_PRIME,
+    .start_frame    = v4l2_request_h264_start_frame,
+    .decode_slice   = v4l2_request_h264_decode_slice,
+    .end_frame      = v4l2_request_h264_end_frame,
+    .frame_priv_data_size = sizeof(V4L2RequestControlsH264),
+    .init           = v4l2_request_h264_init,
+    .uninit         = ff_v4l2_request_uninit,
+    .priv_data_size = sizeof(V4L2RequestContextH264),
+    .frame_params   = ff_v4l2_request_frame_params,
+    .caps_internal  = HWACCEL_CAP_ASYNC_SAFE,
+};

From 02b8fb17c2a019463dcab4baa1cb0bec63353183 Mon Sep 17 00:00:00 2001
From: Jonas Karlman <jonas@kwiboo.se>
Date: Sat, 15 Dec 2018 22:32:16 +0100
Subject: [PATCH 06/17] Add V4L2 request API mpeg2 hwaccel

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
 configure                       |   3 +
 libavcodec/Makefile             |   1 +
 libavcodec/hwaccels.h           |   1 +
 libavcodec/mpeg12dec.c          |   6 ++
 libavcodec/v4l2_request_mpeg2.c | 159 ++++++++++++++++++++++++++++++++
 5 files changed, 170 insertions(+)
 create mode 100644 libavcodec/v4l2_request_mpeg2.c

diff --git a/configure b/configure
index b17e4108c1b..ec141fabbdc 100755
--- a/configure
+++ b/configure
@@ -2995,6 +2995,8 @@ mpeg2_dxva2_hwaccel_deps="dxva2"
 mpeg2_dxva2_hwaccel_select="mpeg2video_decoder"
 mpeg2_nvdec_hwaccel_deps="nvdec"
 mpeg2_nvdec_hwaccel_select="mpeg2video_decoder"
+mpeg2_v4l2request_hwaccel_deps="v4l2_request mpeg2_v4l2_request"
+mpeg2_v4l2request_hwaccel_select="mpeg2video_decoder"
 mpeg2_vaapi_hwaccel_deps="vaapi"
 mpeg2_vaapi_hwaccel_select="mpeg2video_decoder"
 mpeg2_vdpau_hwaccel_deps="vdpau"
@@ -6631,6 +6633,7 @@ fi
 
 check_func_headers "linux/media.h linux/videodev2.h" v4l2_timeval_to_ns
 check_cc h264_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_H264_SLICE;"
+check_cc mpeg2_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_MPEG2_SLICE;"
 
 check_headers sys/videoio.h
 test_code cc sys/videoio.h "struct v4l2_frmsizeenum vfse; vfse.discrete.width = 0;" && enable_sanitized struct_v4l2_frmivalenum_discrete
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 426c7528e90..02c023a4477 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -955,6 +955,7 @@ OBJS-$(CONFIG_MPEG2_D3D11VA_HWACCEL)      += dxva2_mpeg2.o
 OBJS-$(CONFIG_MPEG2_DXVA2_HWACCEL)        += dxva2_mpeg2.o
 OBJS-$(CONFIG_MPEG2_NVDEC_HWACCEL)        += nvdec_mpeg12.o
 OBJS-$(CONFIG_MPEG2_QSV_HWACCEL)          += qsvdec.o
+OBJS-$(CONFIG_MPEG2_V4L2REQUEST_HWACCEL)  += v4l2_request_mpeg2.o
 OBJS-$(CONFIG_MPEG2_VAAPI_HWACCEL)        += vaapi_mpeg2.o
 OBJS-$(CONFIG_MPEG2_VDPAU_HWACCEL)        += vdpau_mpeg12.o
 OBJS-$(CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL) += videotoolbox.o
diff --git a/libavcodec/hwaccels.h b/libavcodec/hwaccels.h
index 969a1da0f4b..a8ae1483d8e 100644
--- a/libavcodec/hwaccels.h
+++ b/libavcodec/hwaccels.h
@@ -53,6 +53,7 @@ extern const AVHWAccel ff_mpeg2_d3d11va_hwaccel;
 extern const AVHWAccel ff_mpeg2_d3d11va2_hwaccel;
 extern const AVHWAccel ff_mpeg2_nvdec_hwaccel;
 extern const AVHWAccel ff_mpeg2_dxva2_hwaccel;
+extern const AVHWAccel ff_mpeg2_v4l2request_hwaccel;
 extern const AVHWAccel ff_mpeg2_vaapi_hwaccel;
 extern const AVHWAccel ff_mpeg2_vdpau_hwaccel;
 extern const AVHWAccel ff_mpeg2_videotoolbox_hwaccel;
diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
index 94221da2c15..4b0176f6cb1 100644
--- a/libavcodec/mpeg12dec.c
+++ b/libavcodec/mpeg12dec.c
@@ -1147,6 +1147,9 @@ static const enum AVPixelFormat mpeg2_hwaccel_pixfmt_list_420[] = {
 #endif
 #if CONFIG_MPEG2_VIDEOTOOLBOX_HWACCEL
     AV_PIX_FMT_VIDEOTOOLBOX,
+#endif
+#if CONFIG_MPEG2_V4L2REQUEST_HWACCEL
+    AV_PIX_FMT_DRM_PRIME,
 #endif
     AV_PIX_FMT_YUV420P,
     AV_PIX_FMT_NONE
@@ -2961,6 +2964,9 @@ AVCodec ff_mpeg2video_decoder = {
 #endif
 #if CONFIG_MPEG2_XVMC_HWACCEL
                         HWACCEL_XVMC(mpeg2),
+#endif
+#if CONFIG_MPEG2_V4L2REQUEST_HWACCEL
+                        HWACCEL_V4L2REQUEST(mpeg2),
 #endif
                         NULL
                     },
diff --git a/libavcodec/v4l2_request_mpeg2.c b/libavcodec/v4l2_request_mpeg2.c
new file mode 100644
index 00000000000..84d53209c79
--- /dev/null
+++ b/libavcodec/v4l2_request_mpeg2.c
@@ -0,0 +1,159 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "hwconfig.h"
+#include "mpegvideo.h"
+#include "v4l2_request.h"
+
+typedef struct V4L2RequestControlsMPEG2 {
+    struct v4l2_ctrl_mpeg2_sequence sequence;
+    struct v4l2_ctrl_mpeg2_picture picture;
+    struct v4l2_ctrl_mpeg2_quantisation quantisation;
+} V4L2RequestControlsMPEG2;
+
+static int v4l2_request_mpeg2_start_frame(AVCodecContext *avctx,
+                                          av_unused const uint8_t *buffer,
+                                          av_unused uint32_t size)
+{
+    const MpegEncContext *s = avctx->priv_data;
+    V4L2RequestControlsMPEG2 *controls = s->current_picture_ptr->hwaccel_picture_private;
+    V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)s->current_picture_ptr->f->data[0];
+
+    controls->sequence = (struct v4l2_ctrl_mpeg2_sequence) {
+        /* ISO/IEC 13818-2, ITU-T Rec. H.262: Sequence header */
+        .horizontal_size = s->width,
+        .vertical_size = s->height,
+        .vbv_buffer_size = req->output.size,
+
+        /* ISO/IEC 13818-2, ITU-T Rec. H.262: Sequence extension */
+        .profile_and_level_indication = 0,
+        .chroma_format = s->chroma_format,
+    };
+
+    if (s->progressive_sequence)
+        controls->sequence.flags |= V4L2_MPEG2_SEQ_FLAG_PROGRESSIVE;
+
+    controls->picture = (struct v4l2_ctrl_mpeg2_picture) {
+        /* ISO/IEC 13818-2, ITU-T Rec. H.262: Picture header */
+        .picture_coding_type = s->pict_type,
+
+        /* ISO/IEC 13818-2, ITU-T Rec. H.262: Picture coding extension */
+        .f_code[0][0] = s->mpeg_f_code[0][0],
+        .f_code[0][1] = s->mpeg_f_code[0][1],
+        .f_code[1][0] = s->mpeg_f_code[1][0],
+        .f_code[1][1] = s->mpeg_f_code[1][1],
+        .picture_structure = s->picture_structure,
+        .intra_dc_precision = s->intra_dc_precision,
+    };
+
+    if (s->top_field_first)
+        controls->picture.flags |= V4L2_MPEG2_PIC_FLAG_TOP_FIELD_FIRST;
+
+    if (s->frame_pred_frame_dct)
+        controls->picture.flags |= V4L2_MPEG2_PIC_FLAG_FRAME_PRED_DCT;
+
+    if (s->concealment_motion_vectors)
+        controls->picture.flags |= V4L2_MPEG2_PIC_FLAG_CONCEALMENT_MV;
+
+    if (s->intra_vlc_format)
+        controls->picture.flags |= V4L2_MPEG2_PIC_FLAG_INTRA_VLC;
+
+    if (s->q_scale_type)
+        controls->picture.flags |= V4L2_MPEG2_PIC_FLAG_Q_SCALE_TYPE;
+
+    if (s->alternate_scan)
+        controls->picture.flags |= V4L2_MPEG2_PIC_FLAG_ALT_SCAN;
+
+    if (s->repeat_first_field)
+        controls->picture.flags |= V4L2_MPEG2_PIC_FLAG_REPEAT_FIRST;
+
+    if (s->progressive_frame)
+        controls->picture.flags |= V4L2_MPEG2_PIC_FLAG_PROGRESSIVE;
+
+    switch (s->pict_type) {
+    case AV_PICTURE_TYPE_B:
+        controls->picture.backward_ref_ts = ff_v4l2_request_get_capture_timestamp(s->next_picture.f);
+        // fall-through
+    case AV_PICTURE_TYPE_P:
+        controls->picture.forward_ref_ts = ff_v4l2_request_get_capture_timestamp(s->last_picture.f);
+    }
+
+    for (int i = 0; i < 64; i++) {
+        int n = s->idsp.idct_permutation[ff_zigzag_direct[i]];
+        controls->quantisation.intra_quantiser_matrix[i] = s->intra_matrix[n];
+        controls->quantisation.non_intra_quantiser_matrix[i] = s->inter_matrix[n];
+        controls->quantisation.chroma_intra_quantiser_matrix[i] = s->chroma_intra_matrix[n];
+        controls->quantisation.chroma_non_intra_quantiser_matrix[i] = s->chroma_inter_matrix[n];
+    }
+
+    return ff_v4l2_request_reset_frame(avctx, s->current_picture_ptr->f);
+}
+
+static int v4l2_request_mpeg2_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
+{
+    const MpegEncContext *s = avctx->priv_data;
+
+    return ff_v4l2_request_append_output_buffer(avctx, s->current_picture_ptr->f, buffer, size);
+}
+
+static int v4l2_request_mpeg2_end_frame(AVCodecContext *avctx)
+{
+    const MpegEncContext *s = avctx->priv_data;
+    V4L2RequestControlsMPEG2 *controls = s->current_picture_ptr->hwaccel_picture_private;
+
+    struct v4l2_ext_control control[] = {
+        {
+            .id = V4L2_CID_STATELESS_MPEG2_SEQUENCE,
+            .ptr = &controls->sequence,
+            .size = sizeof(controls->sequence),
+        },
+        {
+            .id = V4L2_CID_STATELESS_MPEG2_PICTURE,
+            .ptr = &controls->picture,
+            .size = sizeof(controls->picture),
+        },
+        {
+            .id = V4L2_CID_STATELESS_MPEG2_QUANTISATION,
+            .ptr = &controls->quantisation,
+            .size = sizeof(controls->quantisation),
+        },
+    };
+
+    return ff_v4l2_request_decode_frame(avctx, s->current_picture_ptr->f, control, FF_ARRAY_ELEMS(control));
+}
+
+static int v4l2_request_mpeg2_init(AVCodecContext *avctx)
+{
+    return ff_v4l2_request_init(avctx, V4L2_PIX_FMT_MPEG2_SLICE, 1024 * 1024, NULL, 0);
+}
+
+const AVHWAccel ff_mpeg2_v4l2request_hwaccel = {
+    .name           = "mpeg2_v4l2request",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_MPEG2VIDEO,
+    .pix_fmt        = AV_PIX_FMT_DRM_PRIME,
+    .start_frame    = v4l2_request_mpeg2_start_frame,
+    .decode_slice   = v4l2_request_mpeg2_decode_slice,
+    .end_frame      = v4l2_request_mpeg2_end_frame,
+    .frame_priv_data_size = sizeof(V4L2RequestControlsMPEG2),
+    .init           = v4l2_request_mpeg2_init,
+    .uninit         = ff_v4l2_request_uninit,
+    .priv_data_size = sizeof(V4L2RequestContext),
+    .frame_params   = ff_v4l2_request_frame_params,
+    .caps_internal  = HWACCEL_CAP_ASYNC_SAFE,
+};

From 1cd61e5730acc12c39c964bcf13c73a54203a390 Mon Sep 17 00:00:00 2001
From: Boris Brezillon <boris.brezillon@collabora.com>
Date: Wed, 22 May 2019 14:46:58 +0200
Subject: [PATCH 07/17] Add V4L2 request API vp8 hwaccel

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
 configure                     |   3 +
 libavcodec/Makefile           |   1 +
 libavcodec/hwaccels.h         |   1 +
 libavcodec/v4l2_request_vp8.c | 180 ++++++++++++++++++++++++++++++++++
 libavcodec/vp8.c              |   6 ++
 5 files changed, 191 insertions(+)
 create mode 100644 libavcodec/v4l2_request_vp8.c

diff --git a/configure b/configure
index ec141fabbdc..f16bed65a3a 100755
--- a/configure
+++ b/configure
@@ -3027,6 +3027,8 @@ vc1_vdpau_hwaccel_deps="vdpau"
 vc1_vdpau_hwaccel_select="vc1_decoder"
 vp8_nvdec_hwaccel_deps="nvdec"
 vp8_nvdec_hwaccel_select="vp8_decoder"
+vp8_v4l2request_hwaccel_deps="v4l2_request vp8_v4l2_request"
+vp8_v4l2request_hwaccel_select="vp8_decoder"
 vp8_vaapi_hwaccel_deps="vaapi"
 vp8_vaapi_hwaccel_select="vp8_decoder"
 vp9_d3d11va_hwaccel_deps="d3d11va DXVA_PicParams_VP9"
@@ -6634,6 +6636,7 @@ fi
 check_func_headers "linux/media.h linux/videodev2.h" v4l2_timeval_to_ns
 check_cc h264_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_H264_SLICE;"
 check_cc mpeg2_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_MPEG2_SLICE;"
+check_cc vp8_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_VP8_FRAME;"
 
 check_headers sys/videoio.h
 test_code cc sys/videoio.h "struct v4l2_frmsizeenum vfse; vfse.discrete.width = 0;" && enable_sanitized struct_v4l2_frmivalenum_discrete
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 02c023a4477..c79d678eb3e 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -971,6 +971,7 @@ OBJS-$(CONFIG_VC1_QSV_HWACCEL)            += qsvdec.o
 OBJS-$(CONFIG_VC1_VAAPI_HWACCEL)          += vaapi_vc1.o
 OBJS-$(CONFIG_VC1_VDPAU_HWACCEL)          += vdpau_vc1.o
 OBJS-$(CONFIG_VP8_NVDEC_HWACCEL)          += nvdec_vp8.o
+OBJS-$(CONFIG_VP8_V4L2REQUEST_HWACCEL)    += v4l2_request_vp8.o
 OBJS-$(CONFIG_VP8_VAAPI_HWACCEL)          += vaapi_vp8.o
 OBJS-$(CONFIG_VP9_D3D11VA_HWACCEL)        += dxva2_vp9.o
 OBJS-$(CONFIG_VP9_DXVA2_HWACCEL)          += dxva2_vp9.o
diff --git a/libavcodec/hwaccels.h b/libavcodec/hwaccels.h
index a8ae1483d8e..9f8d41e367e 100644
--- a/libavcodec/hwaccels.h
+++ b/libavcodec/hwaccels.h
@@ -69,6 +69,7 @@ extern const AVHWAccel ff_vc1_nvdec_hwaccel;
 extern const AVHWAccel ff_vc1_vaapi_hwaccel;
 extern const AVHWAccel ff_vc1_vdpau_hwaccel;
 extern const AVHWAccel ff_vp8_nvdec_hwaccel;
+extern const AVHWAccel ff_vp8_v4l2request_hwaccel;
 extern const AVHWAccel ff_vp8_vaapi_hwaccel;
 extern const AVHWAccel ff_vp9_d3d11va_hwaccel;
 extern const AVHWAccel ff_vp9_d3d11va2_hwaccel;
diff --git a/libavcodec/v4l2_request_vp8.c b/libavcodec/v4l2_request_vp8.c
new file mode 100644
index 00000000000..bc0fc400727
--- /dev/null
+++ b/libavcodec/v4l2_request_vp8.c
@@ -0,0 +1,180 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "hwconfig.h"
+#include "v4l2_request.h"
+#include "vp8.h"
+
+typedef struct V4L2RequestControlsVP8 {
+    struct v4l2_ctrl_vp8_frame ctrl;
+} V4L2RequestControlsVP8;
+
+static int v4l2_request_vp8_start_frame(AVCodecContext          *avctx,
+                                        av_unused const uint8_t *buffer,
+                                        av_unused uint32_t       size)
+{
+    const VP8Context *s = avctx->priv_data;
+    V4L2RequestControlsVP8 *controls = s->framep[VP56_FRAME_CURRENT]->hwaccel_picture_private;
+
+    memset(&controls->ctrl, 0, sizeof(controls->ctrl));
+    return ff_v4l2_request_reset_frame(avctx, s->framep[VP56_FRAME_CURRENT]->tf.f);
+}
+
+static int v4l2_request_vp8_end_frame(AVCodecContext *avctx)
+{
+    const VP8Context *s = avctx->priv_data;
+    V4L2RequestControlsVP8 *controls = s->framep[VP56_FRAME_CURRENT]->hwaccel_picture_private;
+    struct v4l2_ext_control control[] = {
+        {
+            .id = V4L2_CID_STATELESS_VP8_FRAME,
+            .ptr = &controls->ctrl,
+            .size = sizeof(controls->ctrl),
+        },
+    };
+
+    return ff_v4l2_request_decode_frame(avctx, s->framep[VP56_FRAME_CURRENT]->tf.f,
+                                        control, FF_ARRAY_ELEMS(control));
+}
+
+static int v4l2_request_vp8_decode_slice(AVCodecContext *avctx,
+                                         const uint8_t *buffer,
+                                         uint32_t size)
+{
+    const VP8Context *s = avctx->priv_data;
+    V4L2RequestControlsVP8 *controls = s->framep[VP56_FRAME_CURRENT]->hwaccel_picture_private;
+    struct v4l2_ctrl_vp8_frame *frame = &controls->ctrl;
+    const uint8_t *data = buffer + 3 + 7 * s->keyframe;
+    unsigned int i, j, k;
+
+    frame->version = s->profile & 0x3;
+    frame->width = avctx->width;
+    frame->height = avctx->height;
+    /* FIXME: set ->xx_scale */
+    frame->prob_skip_false = s->prob->mbskip;
+    frame->prob_intra = s->prob->intra;
+    frame->prob_gf = s->prob->golden;
+    frame->prob_last = s->prob->last;
+    frame->first_part_size = s->header_partition_size;
+    frame->first_part_header_bits = (8 * (s->coder_state_at_header_end.input - data) -
+                                    s->coder_state_at_header_end.bit_count - 8);
+    frame->num_dct_parts = s->num_coeff_partitions;
+    for (i = 0; i < 8; i++)
+        frame->dct_part_sizes[i] = s->coeff_partition_size[i];
+
+    frame->coder_state.range = s->coder_state_at_header_end.range;
+    frame->coder_state.value = s->coder_state_at_header_end.value;
+    frame->coder_state.bit_count = s->coder_state_at_header_end.bit_count;
+    if (s->framep[VP56_FRAME_PREVIOUS])
+        frame->last_frame_ts = ff_v4l2_request_get_capture_timestamp(s->framep[VP56_FRAME_PREVIOUS]->tf.f);
+    if (s->framep[VP56_FRAME_GOLDEN])
+        frame->golden_frame_ts = ff_v4l2_request_get_capture_timestamp(s->framep[VP56_FRAME_GOLDEN]->tf.f);
+    if (s->framep[VP56_FRAME_GOLDEN2])
+        frame->alt_frame_ts = ff_v4l2_request_get_capture_timestamp(s->framep[VP56_FRAME_GOLDEN2]->tf.f);
+    frame->flags |= s->invisible ? 0 : V4L2_VP8_FRAME_FLAG_SHOW_FRAME;
+    frame->flags |= s->mbskip_enabled ? V4L2_VP8_FRAME_FLAG_MB_NO_SKIP_COEFF : 0;
+    frame->flags |= (s->profile & 0x4) ? V4L2_VP8_FRAME_FLAG_EXPERIMENTAL : 0;
+    frame->flags |= s->keyframe ? V4L2_VP8_FRAME_FLAG_KEY_FRAME : 0;
+    frame->flags |= s->sign_bias[VP56_FRAME_GOLDEN] ? V4L2_VP8_FRAME_FLAG_SIGN_BIAS_GOLDEN : 0;
+    frame->flags |= s->sign_bias[VP56_FRAME_GOLDEN2] ? V4L2_VP8_FRAME_FLAG_SIGN_BIAS_ALT : 0;
+    frame->segment.flags |= s->segmentation.enabled ? V4L2_VP8_SEGMENT_FLAG_ENABLED : 0;
+    frame->segment.flags |= s->segmentation.update_map ? V4L2_VP8_SEGMENT_FLAG_UPDATE_MAP : 0;
+    frame->segment.flags |= s->segmentation.update_feature_data ? V4L2_VP8_SEGMENT_FLAG_UPDATE_FEATURE_DATA : 0;
+    frame->segment.flags |= s->segmentation.absolute_vals ? 0 : V4L2_VP8_SEGMENT_FLAG_DELTA_VALUE_MODE;
+    for (i = 0; i < 4; i++) {
+        frame->segment.quant_update[i] = s->segmentation.base_quant[i];
+        frame->segment.lf_update[i] = s->segmentation.filter_level[i];
+    }
+
+    for (i = 0; i < 3; i++)
+        frame->segment.segment_probs[i] = s->prob->segmentid[i];
+
+    frame->lf.level = s->filter.level;
+    frame->lf.sharpness_level = s->filter.sharpness;
+    frame->lf.flags |= s->lf_delta.enabled ? V4L2_VP8_LF_ADJ_ENABLE : 0;
+    frame->lf.flags |= s->lf_delta.update ? V4L2_VP8_LF_DELTA_UPDATE : 0;
+    frame->lf.flags |= s->filter.simple ? V4L2_VP8_LF_FILTER_TYPE_SIMPLE : 0;
+    for (i = 0; i < 4; i++) {
+        frame->lf.ref_frm_delta[i] = s->lf_delta.ref[i];
+        frame->lf.mb_mode_delta[i] = s->lf_delta.mode[i + MODE_I4x4];
+    }
+
+    // Probabilites
+    if (s->keyframe) {
+        static const uint8_t keyframe_y_mode_probs[4] = {
+            145, 156, 163, 128
+        };
+        static const uint8_t keyframe_uv_mode_probs[3] = {
+            142, 114, 183
+        };
+
+        memcpy(frame->entropy.y_mode_probs, keyframe_y_mode_probs,  4);
+        memcpy(frame->entropy.uv_mode_probs, keyframe_uv_mode_probs, 3);
+    } else {
+        for (i = 0; i < 4; i++)
+            frame->entropy.y_mode_probs[i] = s->prob->pred16x16[i];
+        for (i = 0; i < 3; i++)
+            frame->entropy.uv_mode_probs[i] = s->prob->pred8x8c[i];
+    }
+    for (i = 0; i < 2; i++)
+        for (j = 0; j < 19; j++)
+            frame->entropy.mv_probs[i][j] = s->prob->mvc[i][j];
+
+    for (i = 0; i < 4; i++) {
+        for (j = 0; j < 8; j++) {
+            static const int coeff_bands_inverse[8] = {
+                0, 1, 2, 3, 5, 6, 4, 15
+            };
+            int coeff_pos = coeff_bands_inverse[j];
+
+            for (k = 0; k < 3; k++) {
+                memcpy(frame->entropy.coeff_probs[i][j][k],
+                       s->prob->token[i][coeff_pos][k], 11);
+            }
+        }
+    }
+
+    frame->quant.y_ac_qi = s->quant.yac_qi;
+    frame->quant.y_dc_delta = s->quant.ydc_delta;
+    frame->quant.y2_dc_delta = s->quant.y2dc_delta;
+    frame->quant.y2_ac_delta = s->quant.y2ac_delta;
+    frame->quant.uv_dc_delta = s->quant.uvdc_delta;
+    frame->quant.uv_ac_delta = s->quant.uvac_delta;
+
+    return ff_v4l2_request_append_output_buffer(avctx, s->framep[VP56_FRAME_CURRENT]->tf.f, buffer, size);
+}
+
+static int v4l2_request_vp8_init(AVCodecContext *avctx)
+{
+    return ff_v4l2_request_init(avctx, V4L2_PIX_FMT_VP8_FRAME, 2 * 1024 * 1024, NULL, 0);
+}
+
+const AVHWAccel ff_vp8_v4l2request_hwaccel = {
+    .name           = "vp8_v4l2request",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_VP8,
+    .pix_fmt        = AV_PIX_FMT_DRM_PRIME,
+    .start_frame    = v4l2_request_vp8_start_frame,
+    .decode_slice   = v4l2_request_vp8_decode_slice,
+    .end_frame      = v4l2_request_vp8_end_frame,
+    .frame_priv_data_size = sizeof(V4L2RequestControlsVP8),
+    .init           = v4l2_request_vp8_init,
+    .uninit         = ff_v4l2_request_uninit,
+    .priv_data_size = sizeof(V4L2RequestContext),
+    .frame_params   = ff_v4l2_request_frame_params,
+    .caps_internal  = HWACCEL_CAP_ASYNC_SAFE,
+};
diff --git a/libavcodec/vp8.c b/libavcodec/vp8.c
index d16e7b6aa34..8ee768d875a 100644
--- a/libavcodec/vp8.c
+++ b/libavcodec/vp8.c
@@ -176,6 +176,9 @@ static enum AVPixelFormat get_pixel_format(VP8Context *s)
 #endif
 #if CONFIG_VP8_NVDEC_HWACCEL
         AV_PIX_FMT_CUDA,
+#endif
+#if CONFIG_VP8_V4L2REQUEST_HWACCEL
+        AV_PIX_FMT_DRM_PRIME,
 #endif
         AV_PIX_FMT_YUV420P,
         AV_PIX_FMT_NONE,
@@ -2972,6 +2975,9 @@ AVCodec ff_vp8_decoder = {
 #endif
 #if CONFIG_VP8_NVDEC_HWACCEL
                                HWACCEL_NVDEC(vp8),
+#endif
+#if CONFIG_VP8_V4L2REQUEST_HWACCEL
+                               HWACCEL_V4L2REQUEST(vp8),
 #endif
                                NULL
                            },

From 3c9c4c99eccdda102064ea67a04c8cbf8083ad1a Mon Sep 17 00:00:00 2001
From: Boris Brezillon <boris.brezillon@collabora.com>
Date: Thu, 12 Dec 2019 16:13:55 +0100
Subject: [PATCH 09/17] Add V4L2 request API VP9 hwaccel

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
---
 configure                     |   3 +
 libavcodec/Makefile           |   1 +
 libavcodec/hwaccels.h         |   1 +
 libavcodec/v4l2_request_vp9.c | 268 ++++++++++++++++++++++++++++++++++
 libavcodec/vp9.c              | 192 +++++++++++++++++-------
 libavcodec/vp9dec.h           |   4 +
 libavcodec/vp9shared.h        |   1 +
 7 files changed, 415 insertions(+), 55 deletions(-)
 create mode 100644 libavcodec/v4l2_request_vp9.c

diff --git a/configure b/configure
index 02a80cf27fd..0b238c051df 100755
--- a/configure
+++ b/configure
@@ -3041,6 +3041,8 @@ vp9_dxva2_hwaccel_deps="dxva2 DXVA_PicParams_VP9"
 vp9_dxva2_hwaccel_select="vp9_decoder"
 vp9_nvdec_hwaccel_deps="nvdec"
 vp9_nvdec_hwaccel_select="vp9_decoder"
+vp9_v4l2request_hwaccel_deps="v4l2_request"
+vp9_v4l2request_hwaccel_select="vp9_decoder"
 vp9_vaapi_hwaccel_deps="vaapi VADecPictureParameterBufferVP9_bit_depth"
 vp9_vaapi_hwaccel_select="vp9_decoder"
 vp9_vdpau_hwaccel_deps="vdpau VdpPictureInfoVP9"
@@ -6640,6 +6642,7 @@ check_cc h264_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_H264_SLICE;"
 check_cc h264_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_H264_SLICE;"
 check_cc mpeg2_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_MPEG2_SLICE;"
 check_cc vp8_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_VP8_FRAME;"
+check_cc vp9_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_VP9_FRAME;"
 
 check_headers sys/videoio.h
 test_code cc sys/videoio.h "struct v4l2_frmsizeenum vfse; vfse.discrete.width = 0;" && enable_sanitized struct_v4l2_frmivalenum_discrete
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 0059074530c..38edf1cfe5e 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -977,6 +977,7 @@ OBJS-$(CONFIG_VP8_VAAPI_HWACCEL)          += vaapi_vp8.o
 OBJS-$(CONFIG_VP9_D3D11VA_HWACCEL)        += dxva2_vp9.o
 OBJS-$(CONFIG_VP9_DXVA2_HWACCEL)          += dxva2_vp9.o
 OBJS-$(CONFIG_VP9_NVDEC_HWACCEL)          += nvdec_vp9.o
+OBJS-$(CONFIG_VP9_V4L2REQUEST_HWACCEL)    += v4l2_request_vp9.o
 OBJS-$(CONFIG_VP9_VAAPI_HWACCEL)          += vaapi_vp9.o
 OBJS-$(CONFIG_VP9_VDPAU_HWACCEL)          += vdpau_vp9.o
 OBJS-$(CONFIG_VP8_QSV_HWACCEL)            += qsvdec.o
diff --git a/libavcodec/hwaccels.h b/libavcodec/hwaccels.h
index ffb9fa5087d..fc5d0b0479b 100644
--- a/libavcodec/hwaccels.h
+++ b/libavcodec/hwaccels.h
@@ -76,6 +76,7 @@ extern const AVHWAccel ff_vp9_d3d11va_hwaccel;
 extern const AVHWAccel ff_vp9_d3d11va2_hwaccel;
 extern const AVHWAccel ff_vp9_dxva2_hwaccel;
 extern const AVHWAccel ff_vp9_nvdec_hwaccel;
+extern const AVHWAccel ff_vp9_v4l2request_hwaccel;
 extern const AVHWAccel ff_vp9_vaapi_hwaccel;
 extern const AVHWAccel ff_vp9_vdpau_hwaccel;
 extern const AVHWAccel ff_wmv3_d3d11va_hwaccel;
diff --git a/libavcodec/v4l2_request_vp9.c b/libavcodec/v4l2_request_vp9.c
new file mode 100644
index 00000000000..9b95c76cdb8
--- /dev/null
+++ b/libavcodec/v4l2_request_vp9.c
@@ -0,0 +1,268 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "hwconfig.h"
+#include "v4l2_request.h"
+#include "vp9dec.h"
+
+typedef struct V4L2RequestControlsVP9 {
+    struct v4l2_ctrl_vp9_frame decode_params;
+} V4L2RequestControlsVP9;
+
+static int v4l2_request_vp9_set_frame_ctx(AVCodecContext *avctx)
+{
+    VP9Context *s = avctx->priv_data;
+    struct v4l2_ctrl_vp9_compressed_hdr chp;
+    struct v4l2_ext_control control[] = {
+        {
+            .id = V4L2_CID_STATELESS_VP9_COMPRESSED_HDR,
+            .ptr = &chp,
+            .size = sizeof(chp),
+        },
+    };
+
+    memset(&chp, 0, sizeof(chp));
+
+    chp.tx_mode = s->s.h.txfmmode;
+    memcpy(chp.tx8, s->prob_raw.p.tx8p, sizeof(s->prob_raw.p.tx8p));
+    memcpy(chp.tx16, s->prob_raw.p.tx16p, sizeof(s->prob_raw.p.tx16p));
+    memcpy(chp.tx32, s->prob_raw.p.tx32p, sizeof(s->prob_raw.p.tx32p));
+    for (unsigned i = 0; i < 4; i++) {
+        for (unsigned j = 0; j < 2; j++) {
+            for (unsigned k = 0; k < 2; k++) {
+                for (unsigned l = 0; l < 6; l++) {
+                    for (unsigned m = 0; m < 6; m++) {
+                        memcpy(chp.coef[i][j][k][l][m], s->prob_raw.coef[i][j][k][l][m], sizeof(chp.coef[0][0][0][0][0]));
+                    }
+                }
+            }
+        }
+    }
+    memcpy(chp.skip, s->prob_raw.p.skip, sizeof(s->prob_raw.p.skip));
+    memcpy(chp.inter_mode, s->prob_raw.p.mv_mode, sizeof(s->prob_raw.p.mv_mode));
+    memcpy(chp.interp_filter, s->prob_raw.p.filter, sizeof(s->prob_raw.p.filter));
+    memcpy(chp.is_inter, s->prob_raw.p.intra, sizeof(s->prob_raw.p.intra));
+    memcpy(chp.comp_mode, s->prob_raw.p.comp, sizeof(s->prob_raw.p.comp));
+    memcpy(chp.single_ref, s->prob_raw.p.single_ref, sizeof(s->prob_raw.p.single_ref));
+    memcpy(chp.comp_ref, s->prob_raw.p.comp_ref, sizeof(s->prob_raw.p.comp_ref));
+    memcpy(chp.y_mode, s->prob_raw.p.y_mode, sizeof(s->prob_raw.p.y_mode));
+    for (unsigned i = 0; i < 10; i++)
+        memcpy(chp.uv_mode[i], s->prob.p.uv_mode[i], sizeof(s->prob.p.uv_mode[0]));
+    for (unsigned i = 0; i < 4; i++)
+        memcpy(chp.partition[i * 4], s->prob_raw.p.partition[i], sizeof(s->prob_raw.p.partition[0]));
+    memcpy(chp.mv.joint, s->prob_raw.p.mv_joint, sizeof(s->prob_raw.p.mv_joint));
+    for (unsigned i = 0; i < 2; i++) {
+         chp.mv.sign[i] = s->prob_raw.p.mv_comp[i].sign;
+         memcpy(chp.mv.classes[i], s->prob_raw.p.mv_comp[i].classes, sizeof(s->prob_raw.p.mv_comp[0].classes));
+         chp.mv.class0_bit[i] = s->prob_raw.p.mv_comp[i].class0;
+         memcpy(chp.mv.bits[i], s->prob_raw.p.mv_comp[i].bits, sizeof(s->prob_raw.p.mv_comp[0].bits));
+         memcpy(chp.mv.class0_fr[i], s->prob_raw.p.mv_comp[i].class0_fp, sizeof(s->prob_raw.p.mv_comp[0].class0_fp));
+         memcpy(chp.mv.fr[i], s->prob_raw.p.mv_comp[i].fp, sizeof(s->prob_raw.p.mv_comp[0].fp));
+         chp.mv.class0_hp[i] = s->prob_raw.p.mv_comp[i].class0_hp;
+         chp.mv.hp[i] = s->prob_raw.p.mv_comp[i].hp;
+    }
+
+    return ff_v4l2_request_set_controls(avctx, control, FF_ARRAY_ELEMS(control));
+}
+
+static int v4l2_request_vp9_start_frame(AVCodecContext *avctx,
+                                        av_unused const uint8_t *buffer,
+                                        av_unused uint32_t size)
+{
+    const VP9Context *s = avctx->priv_data;
+    const VP9Frame *f = &s->s.frames[CUR_FRAME];
+    V4L2RequestControlsVP9 *controls = f->hwaccel_picture_private;
+    struct v4l2_ctrl_vp9_frame *dec_params = &controls->decode_params;
+    const ThreadFrame *ref;
+    int ret;
+
+    ret = v4l2_request_vp9_set_frame_ctx(avctx);
+    if (ret)
+	return ret;
+
+    memset(dec_params, 0, sizeof(*dec_params));
+
+    if (s->s.h.keyframe)
+        dec_params->flags |= V4L2_VP9_FRAME_FLAG_KEY_FRAME;
+    if (!s->s.h.invisible)
+        dec_params->flags |= V4L2_VP9_FRAME_FLAG_SHOW_FRAME;
+    if (s->s.h.errorres)
+        dec_params->flags |= V4L2_VP9_FRAME_FLAG_ERROR_RESILIENT;
+    if (s->s.h.intraonly)
+        dec_params->flags |= V4L2_VP9_FRAME_FLAG_INTRA_ONLY;
+    if (!s->s.h.keyframe && s->s.h.highprecisionmvs)
+        dec_params->flags |= V4L2_VP9_FRAME_FLAG_ALLOW_HIGH_PREC_MV;
+    if (s->s.h.refreshctx)
+        dec_params->flags |= V4L2_VP9_FRAME_FLAG_REFRESH_FRAME_CTX;
+    if (s->s.h.parallelmode)
+        dec_params->flags |= V4L2_VP9_FRAME_FLAG_PARALLEL_DEC_MODE;
+    if (s->ss_h)
+        dec_params->flags |= V4L2_VP9_FRAME_FLAG_X_SUBSAMPLING;
+    if (s->ss_v)
+        dec_params->flags |= V4L2_VP9_FRAME_FLAG_Y_SUBSAMPLING;
+    if (avctx->color_range == AVCOL_RANGE_JPEG)
+        dec_params->flags |= V4L2_VP9_FRAME_FLAG_COLOR_RANGE_FULL_SWING;
+
+    dec_params->compressed_header_size = s->s.h.compressed_header_size;
+    dec_params->uncompressed_header_size = s->s.h.uncompressed_header_size;
+    dec_params->profile = s->s.h.profile;
+    dec_params->reset_frame_context = s->s.h.resetctx > 0 ? s->s.h.resetctx - 1 : 0;
+    dec_params->frame_context_idx = s->s.h.framectxid;
+    dec_params->bit_depth = s->s.h.bpp;
+
+    dec_params->interpolation_filter = s->s.h.filtermode ^ (s->s.h.filtermode <= 1);
+    dec_params->tile_cols_log2 = s->s.h.tiling.log2_tile_cols;
+    dec_params->tile_rows_log2 = s->s.h.tiling.log2_tile_rows;
+    dec_params->reference_mode = s->s.h.comppredmode;
+    dec_params->frame_width_minus_1 = s->w - 1;
+    dec_params->frame_height_minus_1 = s->h - 1;
+    //dec_params->render_width_minus_1 = avctx->width - 1;
+    //dec_params->render_height_minus_1 = avctx->height - 1;
+
+    ref = &s->s.refs[s->s.h.refidx[0]];
+    if (ref->f && ref->f->buf[0])
+        dec_params->last_frame_ts = ff_v4l2_request_get_capture_timestamp(ref->f);
+    ref = &s->s.refs[s->s.h.refidx[1]];
+    if (ref->f && ref->f->buf[0])
+        dec_params->golden_frame_ts = ff_v4l2_request_get_capture_timestamp(ref->f);
+    ref = &s->s.refs[s->s.h.refidx[2]];
+    if (ref->f && ref->f->buf[0])
+        dec_params->alt_frame_ts = ff_v4l2_request_get_capture_timestamp(ref->f);
+
+    if (s->s.h.signbias[0])
+        dec_params->ref_frame_sign_bias |= V4L2_VP9_SIGN_BIAS_LAST;
+    if (s->s.h.signbias[1])
+        dec_params->ref_frame_sign_bias |= V4L2_VP9_SIGN_BIAS_GOLDEN;
+    if (s->s.h.signbias[2])
+        dec_params->ref_frame_sign_bias |= V4L2_VP9_SIGN_BIAS_ALT;
+
+    if (s->s.h.lf_delta.enabled)
+        dec_params->lf.flags |= V4L2_VP9_LOOP_FILTER_FLAG_DELTA_ENABLED;
+    if (s->s.h.lf_delta.updated)
+        dec_params->lf.flags |= V4L2_VP9_LOOP_FILTER_FLAG_DELTA_UPDATE;
+
+    dec_params->lf.level = s->s.h.filter.level;
+    dec_params->lf.sharpness = s->s.h.filter.sharpness;
+    for (unsigned i = 0; i < 4; i++)
+        dec_params->lf.ref_deltas[i] = s->s.h.lf_delta.ref[i];
+    for (unsigned i = 0; i < 2; i++)
+        dec_params->lf.mode_deltas[i] = s->s.h.lf_delta.mode[i];
+
+    dec_params->quant.base_q_idx = s->s.h.yac_qi;
+    dec_params->quant.delta_q_y_dc = s->s.h.ydc_qdelta;
+    dec_params->quant.delta_q_uv_dc = s->s.h.uvdc_qdelta;
+    dec_params->quant.delta_q_uv_ac = s->s.h.uvac_qdelta;
+
+    if (s->s.h.segmentation.enabled)
+        dec_params->seg.flags |= V4L2_VP9_SEGMENTATION_FLAG_ENABLED;
+    if (s->s.h.segmentation.update_map)
+        dec_params->seg.flags |= V4L2_VP9_SEGMENTATION_FLAG_UPDATE_MAP;
+    if (s->s.h.segmentation.temporal)
+        dec_params->seg.flags |= V4L2_VP9_SEGMENTATION_FLAG_TEMPORAL_UPDATE;
+    if (s->s.h.segmentation.update_data)
+        dec_params->seg.flags |= V4L2_VP9_SEGMENTATION_FLAG_UPDATE_DATA;
+    if (s->s.h.segmentation.absolute_vals)
+        dec_params->seg.flags |= V4L2_VP9_SEGMENTATION_FLAG_ABS_OR_DELTA_UPDATE;
+
+    for (unsigned i = 0; i < 7; i++)
+        dec_params->seg.tree_probs[i] = s->s.h.segmentation.prob[i];
+
+    if (s->s.h.segmentation.temporal) {
+        for (unsigned i = 0; i < 3; i++)
+            dec_params->seg.pred_probs[i] = s->s.h.segmentation.pred_prob[i];
+    } else {
+        memset(dec_params->seg.pred_probs, 255, sizeof(dec_params->seg.pred_probs));
+    }
+
+    for (unsigned i = 0; i < 8; i++) {
+        if (s->s.h.segmentation.feat[i].q_enabled) {
+            dec_params->seg.feature_enabled[i] |= 1 << V4L2_VP9_SEG_LVL_ALT_Q;
+            dec_params->seg.feature_data[i][V4L2_VP9_SEG_LVL_ALT_Q] = s->s.h.segmentation.feat[i].q_val;
+        }
+
+        if (s->s.h.segmentation.feat[i].lf_enabled) {
+            dec_params->seg.feature_enabled[i] |= 1 << V4L2_VP9_SEG_LVL_ALT_L;
+            dec_params->seg.feature_data[i][V4L2_VP9_SEG_LVL_ALT_L] = s->s.h.segmentation.feat[i].lf_val;
+        }
+
+        if (s->s.h.segmentation.feat[i].ref_enabled) {
+            dec_params->seg.feature_enabled[i] |= 1 << V4L2_VP9_SEG_LVL_REF_FRAME;
+            dec_params->seg.feature_data[i][V4L2_VP9_SEG_LVL_REF_FRAME] = s->s.h.segmentation.feat[i].ref_val;
+        }
+
+        if (s->s.h.segmentation.feat[i].skip_enabled)
+            dec_params->seg.feature_enabled[i] |= 1 << V4L2_VP9_SEG_LVL_SKIP;
+    }
+
+    return ff_v4l2_request_reset_frame(avctx, f->tf.f);
+}
+
+static int v4l2_request_vp9_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
+{
+    const VP9Context *s = avctx->priv_data;
+    const VP9Frame *f = &s->s.frames[CUR_FRAME];
+
+    return ff_v4l2_request_append_output_buffer(avctx, f->tf.f, buffer, size);
+}
+
+static int v4l2_request_vp9_end_frame(AVCodecContext *avctx)
+{
+    const VP9Context *s = avctx->priv_data;
+    const VP9Frame *f = &s->s.frames[CUR_FRAME];
+    V4L2RequestControlsVP9 *controls = f->hwaccel_picture_private;
+    int ret;
+
+    struct v4l2_ext_control control[] = {
+        {
+            .id = V4L2_CID_STATELESS_VP9_FRAME,
+            .ptr = &controls->decode_params,
+            .size = sizeof(controls->decode_params),
+        },
+    };
+
+    ret = ff_v4l2_request_decode_frame(avctx, f->tf.f, control, FF_ARRAY_ELEMS(control));
+    if (ret)
+        return ret;
+
+    if (!s->s.h.refreshctx)
+        return 0;
+
+    return 0;
+}
+
+static int v4l2_request_vp9_init(AVCodecContext *avctx)
+{
+    // TODO: check V4L2_CID_MPEG_VIDEO_VP9_PROFILE
+    return ff_v4l2_request_init(avctx, V4L2_PIX_FMT_VP9_FRAME, 3 * 1024 * 1024, NULL, 0);
+}
+
+const AVHWAccel ff_vp9_v4l2request_hwaccel = {
+    .name           = "vp9_v4l2request",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_VP9,
+    .pix_fmt        = AV_PIX_FMT_DRM_PRIME,
+    .start_frame    = v4l2_request_vp9_start_frame,
+    .decode_slice   = v4l2_request_vp9_decode_slice,
+    .end_frame      = v4l2_request_vp9_end_frame,
+    .frame_priv_data_size = sizeof(V4L2RequestControlsVP9),
+    .init           = v4l2_request_vp9_init,
+    .uninit         = ff_v4l2_request_uninit,
+    .priv_data_size = sizeof(V4L2RequestContext),
+    .frame_params   = ff_v4l2_request_frame_params,
+    .caps_internal  = HWACCEL_CAP_ASYNC_SAFE,
+};
diff --git a/libavcodec/vp9.c b/libavcodec/vp9.c
index 4659f94ee8b..1b2f1eeaf69 100644
--- a/libavcodec/vp9.c
+++ b/libavcodec/vp9.c
@@ -191,6 +191,7 @@ static int update_size(AVCodecContext *avctx, int w, int h)
 #define HWACCEL_MAX (CONFIG_VP9_DXVA2_HWACCEL + \
                      CONFIG_VP9_D3D11VA_HWACCEL * 2 + \
                      CONFIG_VP9_NVDEC_HWACCEL + \
+                     CONFIG_VP9_V4L2REQUEST_HWACCEL + \
                      CONFIG_VP9_VAAPI_HWACCEL + \
                      CONFIG_VP9_VDPAU_HWACCEL)
     enum AVPixelFormat pix_fmts[HWACCEL_MAX + 2], *fmtp = pix_fmts;
@@ -223,6 +224,9 @@ static int update_size(AVCodecContext *avctx, int w, int h)
 #endif
 #if CONFIG_VP9_VDPAU_HWACCEL
             *fmtp++ = AV_PIX_FMT_VDPAU;
+#endif
+#if CONFIG_VP9_V4L2REQUEST_HWACCEL
+            *fmtp++ = AV_PIX_FMT_DRM_PRIME;
 #endif
             break;
         case AV_PIX_FMT_YUV420P12:
@@ -234,6 +238,9 @@ static int update_size(AVCodecContext *avctx, int w, int h)
 #endif
 #if CONFIG_VP9_VDPAU_HWACCEL
             *fmtp++ = AV_PIX_FMT_VDPAU;
+#endif
+#if CONFIG_VP9_V4L2REQUEST_HWACCEL
+            *fmtp++ = AV_PIX_FMT_DRM_PRIME;
 #endif
             break;
         }
@@ -382,7 +389,7 @@ static av_always_inline int inv_recenter_nonneg(int v, int m)
 }
 
 // differential forward probability updates
-static int update_prob(VP56RangeCoder *c, int p)
+static int read_prob_delta(VP56RangeCoder *c)
 {
     static const uint8_t inv_map_table[255] = {
           7,  20,  33,  46,  59,  72,  85,  98, 111, 124, 137, 150, 163, 176,
@@ -436,8 +443,13 @@ static int update_prob(VP56RangeCoder *c, int p)
         av_assert2(d < FF_ARRAY_ELEMS(inv_map_table));
     }
 
-    return p <= 128 ? 1 + inv_recenter_nonneg(inv_map_table[d], p - 1) :
-                    255 - inv_recenter_nonneg(inv_map_table[d], 255 - p);
+    return inv_map_table[d];
+}
+
+static int update_prob(int p, int d)
+{
+    return p <= 128 ? 1 + inv_recenter_nonneg(d, p - 1) :
+                    255 - inv_recenter_nonneg(d, 255 - p);
 }
 
 static int read_colorspace_details(AVCodecContext *avctx)
@@ -703,7 +715,8 @@ static int decode_frame_header(AVCodecContext *avctx,
                                          get_bits(&s->gb, 8) : 255;
         }
 
-        if (get_bits1(&s->gb)) {
+        s->s.h.segmentation.update_data = get_bits1(&s->gb);
+        if (s->s.h.segmentation.update_data) {
             s->s.h.segmentation.absolute_vals = get_bits1(&s->gb);
             for (i = 0; i < 8; i++) {
                 if ((s->s.h.segmentation.feat[i].q_enabled = get_bits1(&s->gb)))
@@ -904,6 +917,8 @@ static int decode_frame_header(AVCodecContext *avctx,
      * as explicit copies if the fw update is missing (and skip the copy upon
      * fw update)? */
     s->prob.p = s->prob_ctx[c].p;
+    memset(&s->prob_raw.p, 0, sizeof(s->prob_raw.p));
+    memset(&s->prob_raw.coef, 0, sizeof(s->prob_raw.coef));
 
     // txfm updates
     if (s->s.h.lossless) {
@@ -915,18 +930,25 @@ static int decode_frame_header(AVCodecContext *avctx,
 
         if (s->s.h.txfmmode == TX_SWITCHABLE) {
             for (i = 0; i < 2; i++)
-                if (vp56_rac_get_prob_branchy(&s->c, 252))
-                    s->prob.p.tx8p[i] = update_prob(&s->c, s->prob.p.tx8p[i]);
+                if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                    s->prob_raw.p.tx8p[i] = read_prob_delta(&s->c);
+                    s->prob.p.tx8p[i] = update_prob(s->prob.p.tx8p[i],
+                                                    s->prob_raw.p.tx8p[i]);
+                }
             for (i = 0; i < 2; i++)
                 for (j = 0; j < 2; j++)
-                    if (vp56_rac_get_prob_branchy(&s->c, 252))
-                        s->prob.p.tx16p[i][j] =
-                            update_prob(&s->c, s->prob.p.tx16p[i][j]);
+                    if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                        s->prob_raw.p.tx16p[i][j] = read_prob_delta(&s->c);
+                        s->prob.p.tx16p[i][j] = update_prob(s->prob.p.tx16p[i][j],
+                                                            s->prob_raw.p.tx16p[i][j]);
+                    }
             for (i = 0; i < 2; i++)
                 for (j = 0; j < 3; j++)
-                    if (vp56_rac_get_prob_branchy(&s->c, 252))
-                        s->prob.p.tx32p[i][j] =
-                            update_prob(&s->c, s->prob.p.tx32p[i][j]);
+                    if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                        s->prob_raw.p.tx32p[i][j] = read_prob_delta(&s->c);
+                        s->prob.p.tx32p[i][j] = update_prob(s->prob.p.tx32p[i][j],
+                                                            s->prob_raw.p.tx32p[i][j]);
+                    }
         }
     }
 
@@ -938,15 +960,18 @@ static int decode_frame_header(AVCodecContext *avctx,
                 for (k = 0; k < 2; k++)
                     for (l = 0; l < 6; l++)
                         for (m = 0; m < 6; m++) {
+                            uint8_t *pd = s->prob_raw.coef[i][j][k][l][m];
                             uint8_t *p = s->prob.coef[i][j][k][l][m];
                             uint8_t *r = ref[j][k][l][m];
                             if (m >= 3 && l == 0) // dc only has 3 pt
                                 break;
                             for (n = 0; n < 3; n++) {
-                                if (vp56_rac_get_prob_branchy(&s->c, 252))
-                                    p[n] = update_prob(&s->c, r[n]);
-                                else
+                                if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                                    pd[n] = read_prob_delta(&s->c);
+                                    p[n] = update_prob(r[n], pd[n]);
+                                } else {
                                     p[n] = r[n];
+                                }
                             }
                             memcpy(&p[3], ff_vp9_model_pareto8[p[2]], 8);
                         }
@@ -961,7 +986,7 @@ static int decode_frame_header(AVCodecContext *avctx,
                                 break;
                             memcpy(p, r, 3);
                             memcpy(&p[3], ff_vp9_model_pareto8[p[2]], 8);
-                        }
+                         }
         }
         if (s->s.h.txfmmode == i)
             break;
@@ -969,25 +994,37 @@ static int decode_frame_header(AVCodecContext *avctx,
 
     // mode updates
     for (i = 0; i < 3; i++)
-        if (vp56_rac_get_prob_branchy(&s->c, 252))
-            s->prob.p.skip[i] = update_prob(&s->c, s->prob.p.skip[i]);
+        if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+            s->prob_raw.p.skip[i] = read_prob_delta(&s->c);
+            s->prob.p.skip[i] = update_prob(s->prob.p.skip[i],
+                                            s->prob_raw.p.skip[i]);
+        }
     if (!s->s.h.keyframe && !s->s.h.intraonly) {
         for (i = 0; i < 7; i++)
             for (j = 0; j < 3; j++)
-                if (vp56_rac_get_prob_branchy(&s->c, 252))
+                if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                    s->prob_raw.p.mv_mode[i][j] = read_prob_delta(&s->c);
                     s->prob.p.mv_mode[i][j] =
-                        update_prob(&s->c, s->prob.p.mv_mode[i][j]);
+                        update_prob(s->prob.p.mv_mode[i][j],
+                                    s->prob_raw.p.mv_mode[i][j]);
+                }
 
         if (s->s.h.filtermode == FILTER_SWITCHABLE)
             for (i = 0; i < 4; i++)
                 for (j = 0; j < 2; j++)
-                    if (vp56_rac_get_prob_branchy(&s->c, 252))
+                    if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                        s->prob_raw.p.filter[i][j] = read_prob_delta(&s->c);
                         s->prob.p.filter[i][j] =
-                            update_prob(&s->c, s->prob.p.filter[i][j]);
+                            update_prob(s->prob.p.filter[i][j],
+                                        s->prob_raw.p.filter[i][j]);
+                    }
 
         for (i = 0; i < 4; i++)
-            if (vp56_rac_get_prob_branchy(&s->c, 252))
-                s->prob.p.intra[i] = update_prob(&s->c, s->prob.p.intra[i]);
+            if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                s->prob_raw.p.intra[i] = read_prob_delta(&s->c);
+                s->prob.p.intra[i] = update_prob(s->prob.p.intra[i],
+                                                 s->prob_raw.p.intra[i]);
+            }
 
         if (s->s.h.allowcompinter) {
             s->s.h.comppredmode = vp8_rac_get(&s->c);
@@ -995,92 +1032,134 @@ static int decode_frame_header(AVCodecContext *avctx,
                 s->s.h.comppredmode += vp8_rac_get(&s->c);
             if (s->s.h.comppredmode == PRED_SWITCHABLE)
                 for (i = 0; i < 5; i++)
-                    if (vp56_rac_get_prob_branchy(&s->c, 252))
+                    if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                        s->prob_raw.p.comp[i] = read_prob_delta(&s->c);
                         s->prob.p.comp[i] =
-                            update_prob(&s->c, s->prob.p.comp[i]);
+                            update_prob(s->prob.p.comp[i], s->prob_raw.p.comp[i]);
+                    }
         } else {
             s->s.h.comppredmode = PRED_SINGLEREF;
         }
 
         if (s->s.h.comppredmode != PRED_COMPREF) {
             for (i = 0; i < 5; i++) {
-                if (vp56_rac_get_prob_branchy(&s->c, 252))
+                if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                    s->prob_raw.p.single_ref[i][0] = read_prob_delta(&s->c);
                     s->prob.p.single_ref[i][0] =
-                        update_prob(&s->c, s->prob.p.single_ref[i][0]);
-                if (vp56_rac_get_prob_branchy(&s->c, 252))
+                        update_prob(s->prob.p.single_ref[i][0],
+                                    s->prob_raw.p.single_ref[i][0]);
+                }
+                if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                    s->prob_raw.p.single_ref[i][1] = read_prob_delta(&s->c);
                     s->prob.p.single_ref[i][1] =
-                        update_prob(&s->c, s->prob.p.single_ref[i][1]);
+                        update_prob(s->prob.p.single_ref[i][1],
+                                    s->prob_raw.p.single_ref[i][1]);
+                }
             }
         }
 
         if (s->s.h.comppredmode != PRED_SINGLEREF) {
             for (i = 0; i < 5; i++)
-                if (vp56_rac_get_prob_branchy(&s->c, 252))
+                if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                    s->prob_raw.p.comp_ref[i] = read_prob_delta(&s->c);
                     s->prob.p.comp_ref[i] =
-                        update_prob(&s->c, s->prob.p.comp_ref[i]);
+                        update_prob(s->prob.p.comp_ref[i],
+                                    s->prob_raw.p.comp_ref[i]);
+                }
         }
 
         for (i = 0; i < 4; i++)
             for (j = 0; j < 9; j++)
-                if (vp56_rac_get_prob_branchy(&s->c, 252))
+                if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                    s->prob_raw.p.y_mode[i][j] = read_prob_delta(&s->c);
                     s->prob.p.y_mode[i][j] =
-                        update_prob(&s->c, s->prob.p.y_mode[i][j]);
+                        update_prob(s->prob.p.y_mode[i][j],
+                                    s->prob_raw.p.y_mode[i][j]);
+                }
 
         for (i = 0; i < 4; i++)
             for (j = 0; j < 4; j++)
                 for (k = 0; k < 3; k++)
-                    if (vp56_rac_get_prob_branchy(&s->c, 252))
+                    if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                        s->prob_raw.p.partition[i][j][k] = read_prob_delta(&s->c);
                         s->prob.p.partition[3 - i][j][k] =
-                            update_prob(&s->c,
-                                        s->prob.p.partition[3 - i][j][k]);
+                            update_prob(s->prob.p.partition[3 - i][j][k],
+                                        s->prob_raw.p.partition[i][j][k]);
+                    }
 
         // mv fields don't use the update_prob subexp model for some reason
         for (i = 0; i < 3; i++)
-            if (vp56_rac_get_prob_branchy(&s->c, 252))
-                s->prob.p.mv_joint[i] = (vp8_rac_get_uint(&s->c, 7) << 1) | 1;
+            if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                s->prob_raw.p.mv_joint[i] = (vp8_rac_get_uint(&s->c, 7) << 1) | 1;
+                s->prob.p.mv_joint[i] = s->prob_raw.p.mv_joint[i];
+            }
 
         for (i = 0; i < 2; i++) {
-            if (vp56_rac_get_prob_branchy(&s->c, 252))
-                s->prob.p.mv_comp[i].sign =
+            if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                s->prob_raw.p.mv_comp[i].sign =
                     (vp8_rac_get_uint(&s->c, 7) << 1) | 1;
+                s->prob.p.mv_comp[i].sign =
+                    s->prob_raw.p.mv_comp[i].sign;
+            }
 
             for (j = 0; j < 10; j++)
-                if (vp56_rac_get_prob_branchy(&s->c, 252))
-                    s->prob.p.mv_comp[i].classes[j] =
+                if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                    s->prob_raw.p.mv_comp[i].classes[j] =
                         (vp8_rac_get_uint(&s->c, 7) << 1) | 1;
+                    s->prob.p.mv_comp[i].classes[j] =
+                        s->prob_raw.p.mv_comp[i].classes[j];
+                }
 
-            if (vp56_rac_get_prob_branchy(&s->c, 252))
-                s->prob.p.mv_comp[i].class0 =
+            if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                s->prob_raw.p.mv_comp[i].class0 =
                     (vp8_rac_get_uint(&s->c, 7) << 1) | 1;
+                s->prob.p.mv_comp[i].class0 =
+                    s->prob_raw.p.mv_comp[i].class0;
+            }
 
             for (j = 0; j < 10; j++)
-                if (vp56_rac_get_prob_branchy(&s->c, 252))
-                    s->prob.p.mv_comp[i].bits[j] =
+                if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                    s->prob_raw.p.mv_comp[i].bits[j] =
                         (vp8_rac_get_uint(&s->c, 7) << 1) | 1;
+                    s->prob.p.mv_comp[i].bits[j] =
+                        s->prob_raw.p.mv_comp[i].bits[j];
+                }
         }
 
         for (i = 0; i < 2; i++) {
             for (j = 0; j < 2; j++)
                 for (k = 0; k < 3; k++)
-                    if (vp56_rac_get_prob_branchy(&s->c, 252))
-                        s->prob.p.mv_comp[i].class0_fp[j][k] =
+                    if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                        s->prob_raw.p.mv_comp[i].class0_fp[j][k] =
                             (vp8_rac_get_uint(&s->c, 7) << 1) | 1;
+                        s->prob.p.mv_comp[i].class0_fp[j][k] =
+                            s->prob_raw.p.mv_comp[i].class0_fp[j][k];
+                    }
 
             for (j = 0; j < 3; j++)
-                if (vp56_rac_get_prob_branchy(&s->c, 252))
-                    s->prob.p.mv_comp[i].fp[j] =
+                if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                    s->prob_raw.p.mv_comp[i].fp[j] =
                         (vp8_rac_get_uint(&s->c, 7) << 1) | 1;
+                    s->prob.p.mv_comp[i].fp[j] =
+                        s->prob_raw.p.mv_comp[i].fp[j];
+                }
         }
 
         if (s->s.h.highprecisionmvs) {
             for (i = 0; i < 2; i++) {
-                if (vp56_rac_get_prob_branchy(&s->c, 252))
-                    s->prob.p.mv_comp[i].class0_hp =
+                if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                    s->prob_raw.p.mv_comp[i].class0_hp =
                         (vp8_rac_get_uint(&s->c, 7) << 1) | 1;
+                    s->prob.p.mv_comp[i].class0_hp =
+                        s->prob_raw.p.mv_comp[i].class0_hp;
+                }
 
-                if (vp56_rac_get_prob_branchy(&s->c, 252))
-                    s->prob.p.mv_comp[i].hp =
+                if (vp56_rac_get_prob_branchy(&s->c, 252)) {
+                    s->prob_raw.p.mv_comp[i].hp =
                         (vp8_rac_get_uint(&s->c, 7) << 1) | 1;
+                    s->prob.p.mv_comp[i].hp =
+                        s->prob_raw.p.mv_comp[i].hp;
+                }
             }
         }
     }
@@ -1912,6 +1991,9 @@ AVCodec ff_vp9_decoder = {
 #endif
 #if CONFIG_VP9_VDPAU_HWACCEL
                                HWACCEL_VDPAU(vp9),
+#endif
+#if CONFIG_VP9_V4L2REQUEST_HWACCEL
+                               HWACCEL_V4L2REQUEST(vp9),
 #endif
                                NULL
                            },
diff --git a/libavcodec/vp9dec.h b/libavcodec/vp9dec.h
index d82b258a3d8..8d2c341e0b9 100644
--- a/libavcodec/vp9dec.h
+++ b/libavcodec/vp9dec.h
@@ -131,6 +131,10 @@ typedef struct VP9Context {
         ProbContext p;
         uint8_t coef[4][2][2][6][6][11];
     } prob;
+    struct {
+        ProbContext p;
+        uint8_t coef[4][2][2][6][6][11];
+    } prob_raw;
 
     // contextual (above) cache
     uint8_t *above_partition_ctx;
diff --git a/libavcodec/vp9shared.h b/libavcodec/vp9shared.h
index 54726df742f..fee3568736f 100644
--- a/libavcodec/vp9shared.h
+++ b/libavcodec/vp9shared.h
@@ -131,6 +131,7 @@ typedef struct VP9BitstreamHeader {
         uint8_t temporal;
         uint8_t absolute_vals;
         uint8_t update_map;
+        uint8_t update_data;
         uint8_t prob[7];
         uint8_t pred_prob[3];
         struct {

From bb3cf90c0533a0096dff74b416f55832814293e0 Mon Sep 17 00:00:00 2001
From: Jonas Karlman <jonas@kwiboo.se>
Date: Mon, 29 Apr 2019 22:08:59 +0000
Subject: [PATCH 11/17] HACK: hwcontext_drm: do not require drm device

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
 libavutil/hwcontext_drm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavutil/hwcontext_drm.c b/libavutil/hwcontext_drm.c
index 7a9fdbd263d..6297d1f9b61 100644
--- a/libavutil/hwcontext_drm.c
+++ b/libavutil/hwcontext_drm.c
@@ -53,6 +53,11 @@ static int drm_device_create(AVHWDeviceContext *hwdev, const char *device,
     AVDRMDeviceContext *hwctx = hwdev->hwctx;
     drmVersionPtr version;
 
+    if (device == NULL) {
+      hwctx->fd = -1;
+      return 0;
+    }
+
     hwctx->fd = open(device, O_RDWR);
     if (hwctx->fd < 0)
         return AVERROR(errno);

From 154405d2d8987c741e722f59430fda9326c8cdef Mon Sep 17 00:00:00 2001
From: Jonas Karlman <jonas@kwiboo.se>
Date: Fri, 15 May 2020 16:54:05 +0000
Subject: [PATCH 13/17] WIP: add NV15 and NV20 support

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
---
 libavcodec/h264_slice.c   | 14 ++++++++++++--
 libavcodec/v4l2_request.c | 23 +++++++++++++++++++++++
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c
index 0a10d00aad9..45057fd049b 100644
--- a/libavcodec/h264_slice.c
+++ b/libavcodec/h264_slice.c
@@ -794,10 +794,17 @@ static enum AVPixelFormat get_pixel_format(H264Context *h, int force_callback)
                 *fmt++ = AV_PIX_FMT_GBRP10;
             } else
                 *fmt++ = AV_PIX_FMT_YUV444P10;
-        } else if (CHROMA422(h))
+        } else if (CHROMA422(h)) {
+#if CONFIG_H264_V4L2REQUEST_HWACCEL
+            *fmt++ = AV_PIX_FMT_DRM_PRIME;
+#endif
             *fmt++ = AV_PIX_FMT_YUV422P10;
-        else
+        } else {
+#if CONFIG_H264_V4L2REQUEST_HWACCEL
+            *fmt++ = AV_PIX_FMT_DRM_PRIME;
+#endif
             *fmt++ = AV_PIX_FMT_YUV420P10;
+        }
         break;
     case 12:
         if (CHROMA444(h)) {
@@ -836,6 +843,9 @@ static enum AVPixelFormat get_pixel_format(H264Context *h, int force_callback)
             else
                 *fmt++ = AV_PIX_FMT_YUV444P;
         } else if (CHROMA422(h)) {
+#if CONFIG_H264_V4L2REQUEST_HWACCEL
+                *fmt++ = AV_PIX_FMT_DRM_PRIME;
+#endif
             if (h->avctx->color_range == AVCOL_RANGE_JPEG)
                 *fmt++ = AV_PIX_FMT_YUVJ422P;
             else
diff --git a/libavcodec/v4l2_request.c b/libavcodec/v4l2_request.c
index 5234b5049b0..0b294feff2e 100644
--- a/libavcodec/v4l2_request.c
+++ b/libavcodec/v4l2_request.c
@@ -188,6 +188,13 @@ const uint32_t v4l2_request_capture_pixelformats[] = {
 #ifdef DRM_FORMAT_MOD_ALLWINNER_TILED
     V4L2_PIX_FMT_SUNXI_TILED_NV12,
 #endif
+#if defined(V4L2_PIX_FMT_NV15) && defined(DRM_FORMAT_NV15)
+    V4L2_PIX_FMT_NV15,
+#endif
+    V4L2_PIX_FMT_NV16,
+#if defined(V4L2_PIX_FMT_NV20) && defined(DRM_FORMAT_NV20)
+    V4L2_PIX_FMT_NV20,
+#endif
 };
 
 static int v4l2_request_set_drm_descriptor(V4L2RequestDescriptor *req, struct v4l2_format *format)
@@ -206,6 +213,22 @@ static int v4l2_request_set_drm_descriptor(V4L2RequestDescriptor *req, struct v4
         layer->format = DRM_FORMAT_NV12;
         desc->objects[0].format_modifier = DRM_FORMAT_MOD_ALLWINNER_TILED;
         break;
+#endif
+#if defined(V4L2_PIX_FMT_NV15) && defined(DRM_FORMAT_NV15)
+    case V4L2_PIX_FMT_NV15:
+        layer->format = DRM_FORMAT_NV15;
+        desc->objects[0].format_modifier = DRM_FORMAT_MOD_LINEAR;
+        break;
+#endif
+    case V4L2_PIX_FMT_NV16:
+        layer->format = DRM_FORMAT_NV16;
+        desc->objects[0].format_modifier = DRM_FORMAT_MOD_LINEAR;
+        break;
+#if defined(V4L2_PIX_FMT_NV20) && defined(DRM_FORMAT_NV20)
+    case V4L2_PIX_FMT_NV20:
+        layer->format = DRM_FORMAT_NV20;
+        desc->objects[0].format_modifier = DRM_FORMAT_MOD_LINEAR;
+        break;
 #endif
     default:
         return -1;

From d7933e19a712a59af418f6b029c0984d5b29afe9 Mon Sep 17 00:00:00 2001
From: Jonas Karlman <jonas@kwiboo.se>
Date: Mon, 27 Jul 2020 23:15:45 +0000
Subject: [PATCH 14/17] HACK: define drm NV15 and NV20 format

---
 libavcodec/v4l2_request.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libavcodec/v4l2_request.c b/libavcodec/v4l2_request.c
index 0b294feff2e..a8f0ee79eee 100644
--- a/libavcodec/v4l2_request.c
+++ b/libavcodec/v4l2_request.c
@@ -30,6 +30,14 @@
 #include "internal.h"
 #include "v4l2_request.h"
 
+#ifndef DRM_FORMAT_NV15
+#define DRM_FORMAT_NV15 fourcc_code('N', 'V', '1', '5')
+#endif
+
+#ifndef DRM_FORMAT_NV20
+#define DRM_FORMAT_NV20 fourcc_code('N', 'V', '2', '0')
+#endif
+
 uint64_t ff_v4l2_request_get_capture_timestamp(AVFrame *frame)
 {
     V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)frame->data[0];

From c9ae9a29ef84096bb2e4d37fbdea6c3b3d20fff7 Mon Sep 17 00:00:00 2001
From: Alex Bee <knaerzche@gmail.com>
Date: Sun, 19 Sep 2021 13:10:55 +0200
Subject: [PATCH 16/17] v4l2_request: validate supported framesizes

Signed-off-by: Alex Bee <knaerzche@gmail.com>
---
 libavcodec/v4l2_request.c | 38 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 37 insertions(+), 1 deletion(-)

diff --git a/libavcodec/v4l2_request.c b/libavcodec/v4l2_request.c
index a8f0ee79eee..2fbe1663416 100644
--- a/libavcodec/v4l2_request.c
+++ b/libavcodec/v4l2_request.c
@@ -376,6 +376,42 @@ int ff_v4l2_request_decode_frame(AVCodecContext *avctx, AVFrame *frame, struct v
     return v4l2_request_queue_decode(avctx, frame, control, count, 1, 1);
 }
 
+static int v4l2_request_try_framesize(AVCodecContext *avctx, uint32_t pixelformat)
+{
+    V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
+    struct v4l2_frmsizeenum frmsize = {
+        .index = 0,
+        .pixel_format = pixelformat,
+    };
+
+    if (ioctl(ctx->video_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize) < 0)
+        return 0;
+
+    /*
+     * We only validate min/max framesize for V4L2_FRMSIZE_TYPE_STEPWISE here, since the alignment
+     * which is eventually needed will be done driver-side later in VIDIOC_S_FMT and there is no need
+     * validate step_width/step_height here
+     */
+
+    do {
+
+        if (frmsize.type == V4L2_FRMSIZE_TYPE_DISCRETE && frmsize.discrete.width == avctx->coded_width &&
+            frmsize.discrete.height == avctx->coded_height)
+            return 0;
+        else if ((frmsize.type == V4L2_FRMSIZE_TYPE_STEPWISE || frmsize.type == V4L2_FRMSIZE_TYPE_CONTINUOUS) &&
+                 avctx->coded_width >= frmsize.stepwise.min_width && avctx->coded_height >= frmsize.stepwise.min_height &&
+                 avctx->coded_width <= frmsize.stepwise.max_width && avctx->coded_height <= frmsize.stepwise.max_height)
+            return 0;
+
+        frmsize.index++;
+
+    } while (ioctl(ctx->video_fd, VIDIOC_ENUM_FRAMESIZES, &frmsize) >= 0);
+
+    av_log(avctx, AV_LOG_INFO, "%s: pixelformat %u not supported for width %u height %u\n", __func__, pixelformat, avctx->coded_width, avctx->coded_height);
+
+    return -1;
+}
+
 static int v4l2_request_try_format(AVCodecContext *avctx, enum v4l2_buf_type type, uint32_t pixelformat)
 {
     V4L2RequestContext *ctx = avctx->internal->hwaccel_priv_data;
@@ -404,7 +440,7 @@ static int v4l2_request_try_format(AVCodecContext *avctx, enum v4l2_buf_type typ
 
     while (ioctl(ctx->video_fd, VIDIOC_ENUM_FMT, &fmtdesc) >= 0) {
         if (fmtdesc.pixelformat == pixelformat)
-            return 0;
+            return v4l2_request_try_framesize(avctx, pixelformat);
 
         fmtdesc.index++;
     }

From c415926540fe04141bb1e8cabd24049b61752d4f Mon Sep 17 00:00:00 2001
From: Jernej Skrabec <jernej.skrabec@gmail.com>
Date: Sun, 27 Feb 2022 18:54:21 +0100
Subject: [PATCH 17/17] Improve VP9 decoding

---
 libavcodec/v4l2_request_vp9.c | 110 +++++++++++++++++++---------------
 1 file changed, 62 insertions(+), 48 deletions(-)

diff --git a/libavcodec/v4l2_request_vp9.c b/libavcodec/v4l2_request_vp9.c
index 9b95c76cdb8..ec0300f66db 100644
--- a/libavcodec/v4l2_request_vp9.c
+++ b/libavcodec/v4l2_request_vp9.c
@@ -22,78 +22,62 @@
 
 typedef struct V4L2RequestControlsVP9 {
     struct v4l2_ctrl_vp9_frame decode_params;
+    struct v4l2_ctrl_vp9_compressed_hdr chp;
 } V4L2RequestControlsVP9;
 
-static int v4l2_request_vp9_set_frame_ctx(AVCodecContext *avctx)
+static void v4l2_request_vp9_set_frame_ctx(AVCodecContext *avctx)
 {
     VP9Context *s = avctx->priv_data;
-    struct v4l2_ctrl_vp9_compressed_hdr chp;
-    struct v4l2_ext_control control[] = {
-        {
-            .id = V4L2_CID_STATELESS_VP9_COMPRESSED_HDR,
-            .ptr = &chp,
-            .size = sizeof(chp),
-        },
-    };
+    const VP9Frame *f = &s->s.frames[CUR_FRAME];
+    V4L2RequestControlsVP9 *controls = f->hwaccel_picture_private;
+    struct v4l2_ctrl_vp9_compressed_hdr *chp = &controls->chp;
 
-    memset(&chp, 0, sizeof(chp));
+    memset(chp, 0, sizeof(&chp));
 
-    chp.tx_mode = s->s.h.txfmmode;
-    memcpy(chp.tx8, s->prob_raw.p.tx8p, sizeof(s->prob_raw.p.tx8p));
-    memcpy(chp.tx16, s->prob_raw.p.tx16p, sizeof(s->prob_raw.p.tx16p));
-    memcpy(chp.tx32, s->prob_raw.p.tx32p, sizeof(s->prob_raw.p.tx32p));
+    chp->tx_mode = s->s.h.txfmmode;
+    memcpy(chp->tx8, s->prob_raw.p.tx8p, sizeof(s->prob_raw.p.tx8p));
+    memcpy(chp->tx16, s->prob_raw.p.tx16p, sizeof(s->prob_raw.p.tx16p));
+    memcpy(chp->tx32, s->prob_raw.p.tx32p, sizeof(s->prob_raw.p.tx32p));
     for (unsigned i = 0; i < 4; i++) {
         for (unsigned j = 0; j < 2; j++) {
             for (unsigned k = 0; k < 2; k++) {
                 for (unsigned l = 0; l < 6; l++) {
                     for (unsigned m = 0; m < 6; m++) {
-                        memcpy(chp.coef[i][j][k][l][m], s->prob_raw.coef[i][j][k][l][m], sizeof(chp.coef[0][0][0][0][0]));
+                        memcpy(chp->coef[i][j][k][l][m], s->prob_raw.coef[i][j][k][l][m], sizeof(chp->coef[0][0][0][0][0]));
                     }
                 }
             }
         }
     }
-    memcpy(chp.skip, s->prob_raw.p.skip, sizeof(s->prob_raw.p.skip));
-    memcpy(chp.inter_mode, s->prob_raw.p.mv_mode, sizeof(s->prob_raw.p.mv_mode));
-    memcpy(chp.interp_filter, s->prob_raw.p.filter, sizeof(s->prob_raw.p.filter));
-    memcpy(chp.is_inter, s->prob_raw.p.intra, sizeof(s->prob_raw.p.intra));
-    memcpy(chp.comp_mode, s->prob_raw.p.comp, sizeof(s->prob_raw.p.comp));
-    memcpy(chp.single_ref, s->prob_raw.p.single_ref, sizeof(s->prob_raw.p.single_ref));
-    memcpy(chp.comp_ref, s->prob_raw.p.comp_ref, sizeof(s->prob_raw.p.comp_ref));
-    memcpy(chp.y_mode, s->prob_raw.p.y_mode, sizeof(s->prob_raw.p.y_mode));
+    memcpy(chp->skip, s->prob_raw.p.skip, sizeof(s->prob_raw.p.skip));
+    memcpy(chp->inter_mode, s->prob_raw.p.mv_mode, sizeof(s->prob_raw.p.mv_mode));
+    memcpy(chp->interp_filter, s->prob_raw.p.filter, sizeof(s->prob_raw.p.filter));
+    memcpy(chp->is_inter, s->prob_raw.p.intra, sizeof(s->prob_raw.p.intra));
+    memcpy(chp->comp_mode, s->prob_raw.p.comp, sizeof(s->prob_raw.p.comp));
+    memcpy(chp->single_ref, s->prob_raw.p.single_ref, sizeof(s->prob_raw.p.single_ref));
+    memcpy(chp->comp_ref, s->prob_raw.p.comp_ref, sizeof(s->prob_raw.p.comp_ref));
+    memcpy(chp->y_mode, s->prob_raw.p.y_mode, sizeof(s->prob_raw.p.y_mode));
     for (unsigned i = 0; i < 10; i++)
-        memcpy(chp.uv_mode[i], s->prob.p.uv_mode[i], sizeof(s->prob.p.uv_mode[0]));
+        memcpy(chp->uv_mode[i], s->prob.p.uv_mode[i], sizeof(s->prob.p.uv_mode[0]));
     for (unsigned i = 0; i < 4; i++)
-        memcpy(chp.partition[i * 4], s->prob_raw.p.partition[i], sizeof(s->prob_raw.p.partition[0]));
-    memcpy(chp.mv.joint, s->prob_raw.p.mv_joint, sizeof(s->prob_raw.p.mv_joint));
+        memcpy(chp->partition[i * 4], s->prob_raw.p.partition[i], sizeof(s->prob_raw.p.partition[0]));
+    memcpy(chp->mv.joint, s->prob_raw.p.mv_joint, sizeof(s->prob_raw.p.mv_joint));
     for (unsigned i = 0; i < 2; i++) {
-         chp.mv.sign[i] = s->prob_raw.p.mv_comp[i].sign;
-         memcpy(chp.mv.classes[i], s->prob_raw.p.mv_comp[i].classes, sizeof(s->prob_raw.p.mv_comp[0].classes));
-         chp.mv.class0_bit[i] = s->prob_raw.p.mv_comp[i].class0;
-         memcpy(chp.mv.bits[i], s->prob_raw.p.mv_comp[i].bits, sizeof(s->prob_raw.p.mv_comp[0].bits));
-         memcpy(chp.mv.class0_fr[i], s->prob_raw.p.mv_comp[i].class0_fp, sizeof(s->prob_raw.p.mv_comp[0].class0_fp));
-         memcpy(chp.mv.fr[i], s->prob_raw.p.mv_comp[i].fp, sizeof(s->prob_raw.p.mv_comp[0].fp));
-         chp.mv.class0_hp[i] = s->prob_raw.p.mv_comp[i].class0_hp;
-         chp.mv.hp[i] = s->prob_raw.p.mv_comp[i].hp;
+         chp->mv.sign[i] = s->prob_raw.p.mv_comp[i].sign;
+         memcpy(chp->mv.classes[i], s->prob_raw.p.mv_comp[i].classes, sizeof(s->prob_raw.p.mv_comp[0].classes));
+         chp->mv.class0_bit[i] = s->prob_raw.p.mv_comp[i].class0;
+         memcpy(chp->mv.bits[i], s->prob_raw.p.mv_comp[i].bits, sizeof(s->prob_raw.p.mv_comp[0].bits));
+         memcpy(chp->mv.class0_fr[i], s->prob_raw.p.mv_comp[i].class0_fp, sizeof(s->prob_raw.p.mv_comp[0].class0_fp));
+         memcpy(chp->mv.fr[i], s->prob_raw.p.mv_comp[i].fp, sizeof(s->prob_raw.p.mv_comp[0].fp));
+         chp->mv.class0_hp[i] = s->prob_raw.p.mv_comp[i].class0_hp;
+         chp->mv.hp[i] = s->prob_raw.p.mv_comp[i].hp;
     }
-
-    return ff_v4l2_request_set_controls(avctx, control, FF_ARRAY_ELEMS(control));
 }
 
-static int v4l2_request_vp9_start_frame(AVCodecContext *avctx,
-                                        av_unused const uint8_t *buffer,
-                                        av_unused uint32_t size)
+static void fill_frame(struct v4l2_ctrl_vp9_frame *dec_params, AVCodecContext *avctx)
 {
     const VP9Context *s = avctx->priv_data;
-    const VP9Frame *f = &s->s.frames[CUR_FRAME];
-    V4L2RequestControlsVP9 *controls = f->hwaccel_picture_private;
-    struct v4l2_ctrl_vp9_frame *dec_params = &controls->decode_params;
     const ThreadFrame *ref;
-    int ret;
-
-    ret = v4l2_request_vp9_set_frame_ctx(avctx);
-    if (ret)
-	return ret;
 
     memset(dec_params, 0, sizeof(*dec_params));
 
@@ -208,6 +192,19 @@ static int v4l2_request_vp9_start_frame(AVCodecContext *avctx,
         if (s->s.h.segmentation.feat[i].skip_enabled)
             dec_params->seg.feature_enabled[i] |= 1 << V4L2_VP9_SEG_LVL_SKIP;
     }
+}
+
+static int v4l2_request_vp9_start_frame(AVCodecContext *avctx,
+                                        av_unused const uint8_t *buffer,
+                                        av_unused uint32_t size)
+{
+    const VP9Context *s = avctx->priv_data;
+    const VP9Frame *f = &s->s.frames[CUR_FRAME];
+    V4L2RequestControlsVP9 *controls = f->hwaccel_picture_private;
+
+    v4l2_request_vp9_set_frame_ctx(avctx);
+
+    fill_frame(&controls->decode_params, avctx);
 
     return ff_v4l2_request_reset_frame(avctx, f->tf.f);
 }
@@ -233,6 +230,11 @@ static int v4l2_request_vp9_end_frame(AVCodecContext *avctx)
             .ptr = &controls->decode_params,
             .size = sizeof(controls->decode_params),
         },
+        {
+            .id = V4L2_CID_STATELESS_VP9_COMPRESSED_HDR,
+            .ptr = &controls->chp,
+            .size = sizeof(controls->chp),
+        },
     };
 
     ret = ff_v4l2_request_decode_frame(avctx, f->tf.f, control, FF_ARRAY_ELEMS(control));
@@ -247,8 +249,20 @@ static int v4l2_request_vp9_end_frame(AVCodecContext *avctx)
 
 static int v4l2_request_vp9_init(AVCodecContext *avctx)
 {
+    struct v4l2_ctrl_vp9_frame frame;
+
+    struct v4l2_ext_control control[] = {
+        {
+            .id = V4L2_CID_STATELESS_VP9_FRAME,
+            .ptr = &frame,
+            .size = sizeof(frame),
+        },
+    };
+
+    fill_frame(&frame, avctx);
+
     // TODO: check V4L2_CID_MPEG_VIDEO_VP9_PROFILE
-    return ff_v4l2_request_init(avctx, V4L2_PIX_FMT_VP9_FRAME, 3 * 1024 * 1024, NULL, 0);
+    return ff_v4l2_request_init(avctx, V4L2_PIX_FMT_VP9_FRAME, 3 * 1024 * 1024, control, FF_ARRAY_ELEMS(control));
 }
 
 const AVHWAccel ff_vp9_v4l2request_hwaccel = {
From e5df38921bf3a7f918c7e05b0207e3fde6c65017 Mon Sep 17 00:00:00 2001
From: Jernej Skrabec <jernej.skrabec@siol.net>
Date: Sat, 15 Dec 2018 22:32:16 +0100
Subject: [PATCH] Add V4L2 request API hevc hwaccel

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Signed-off-by: Alex Bee <knaerzche@gmail.com>
---
 configure                      |   3 +
 libavcodec/Makefile            |   1 +
 libavcodec/hevcdec.c           |  10 +
 libavcodec/hwaccels.h          |   1 +
 libavcodec/v4l2_request_hevc.c | 679 +++++++++++++++++++++++++++++++++
 5 files changed, 694 insertions(+)
 create mode 100644 libavcodec/v4l2_request_hevc.c

diff --git a/configure b/configure
index 794bd7f4d612..2565ce8d7c20 100755
--- a/configure
+++ b/configure
@@ -3049,6 +3049,8 @@ hevc_dxva2_hwaccel_deps="dxva2 DXVA_PicParams_HEVC"
 hevc_dxva2_hwaccel_select="hevc_decoder"
 hevc_nvdec_hwaccel_deps="nvdec"
 hevc_nvdec_hwaccel_select="hevc_decoder"
+hevc_v4l2request_hwaccel_deps="v4l2_request hevc_v4l2_request"
+hevc_v4l2request_hwaccel_select="hevc_decoder"
 hevc_vaapi_hwaccel_deps="vaapi VAPictureParameterBufferHEVC"
 hevc_vaapi_hwaccel_select="hevc_decoder"
 hevc_vdpau_hwaccel_deps="vdpau VdpPictureInfoHEVC"
@@ -6894,6 +6896,7 @@ fi
 
 check_func_headers "linux/media.h linux/videodev2.h" v4l2_timeval_to_ns
 check_cc h264_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_H264_SLICE;"
+check_cc hevc_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_HEVC_SLICE;"
 check_cc mpeg2_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_MPEG2_SLICE;"
 check_cc vp8_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_VP8_FRAME;"
 check_cc vp9_v4l2_request linux/videodev2.h "int i = V4L2_PIX_FMT_VP9_FRAME;"
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index 7da4fd1a8718..cd08740e75f1 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -998,6 +998,7 @@ OBJS-$(CONFIG_HEVC_D3D11VA_HWACCEL)       += dxva2_hevc.o
 OBJS-$(CONFIG_HEVC_DXVA2_HWACCEL)         += dxva2_hevc.o
 OBJS-$(CONFIG_HEVC_NVDEC_HWACCEL)         += nvdec_hevc.o
 OBJS-$(CONFIG_HEVC_QSV_HWACCEL)           += qsvdec.o
+OBJS-$(CONFIG_HEVC_V4L2REQUEST_HWACCEL)   += v4l2_request_hevc.o
 OBJS-$(CONFIG_HEVC_VAAPI_HWACCEL)         += vaapi_hevc.o h265_profile_level.o
 OBJS-$(CONFIG_HEVC_VDPAU_HWACCEL)         += vdpau_hevc.o h265_profile_level.o
 OBJS-$(CONFIG_MJPEG_NVDEC_HWACCEL)        += nvdec_mjpeg.o
diff --git a/libavcodec/hevcdec.c b/libavcodec/hevcdec.c
index 567e8d81d4a6..79b821e7e51e 100644
--- a/libavcodec/hevcdec.c
+++ b/libavcodec/hevcdec.c
@@ -403,6 +403,7 @@ static enum AVPixelFormat get_format(HEVCContext *s, const HEVCSPS *sps)
 #define HWACCEL_MAX (CONFIG_HEVC_DXVA2_HWACCEL + \
                      CONFIG_HEVC_D3D11VA_HWACCEL * 2 + \
                      CONFIG_HEVC_NVDEC_HWACCEL + \
+                     CONFIG_HEVC_V4L2REQUEST_HWACCEL + \
                      CONFIG_HEVC_VAAPI_HWACCEL + \
                      CONFIG_HEVC_VIDEOTOOLBOX_HWACCEL + \
                      CONFIG_HEVC_VDPAU_HWACCEL)
@@ -429,6 +430,9 @@ static enum AVPixelFormat get_format(HEVCContext *s, const HEVCSPS *sps)
 #endif
 #if CONFIG_HEVC_VIDEOTOOLBOX_HWACCEL
         *fmt++ = AV_PIX_FMT_VIDEOTOOLBOX;
+#endif
+#if CONFIG_HEVC_V4L2REQUEST_HWACCEL
+        *fmt++ = AV_PIX_FMT_DRM_PRIME;
 #endif
         break;
     case AV_PIX_FMT_YUV420P10:
@@ -450,6 +454,9 @@ static enum AVPixelFormat get_format(HEVCContext *s, const HEVCSPS *sps)
 #endif
 #if CONFIG_HEVC_NVDEC_HWACCEL
         *fmt++ = AV_PIX_FMT_CUDA;
+#endif
+#if CONFIG_HEVC_V4L2REQUEST_HWACCEL
+        *fmt++ = AV_PIX_FMT_DRM_PRIME;
 #endif
         break;
     case AV_PIX_FMT_YUV444P:
@@ -3739,6 +3746,9 @@ const FFCodec ff_hevc_decoder = {
 #endif
 #if CONFIG_HEVC_VIDEOTOOLBOX_HWACCEL
                                HWACCEL_VIDEOTOOLBOX(hevc),
+#endif
+#if CONFIG_HEVC_V4L2REQUEST_HWACCEL
+                               HWACCEL_V4L2REQUEST(hevc),
 #endif
                                NULL
                            },
diff --git a/libavcodec/hwaccels.h b/libavcodec/hwaccels.h
index 6f9f0780019b..e4e4abc0606a 100644
--- a/libavcodec/hwaccels.h
+++ b/libavcodec/hwaccels.h
@@ -41,6 +41,7 @@ extern const AVHWAccel ff_hevc_d3d11va_hwaccel;
 extern const AVHWAccel ff_hevc_d3d11va2_hwaccel;
 extern const AVHWAccel ff_hevc_dxva2_hwaccel;
 extern const AVHWAccel ff_hevc_nvdec_hwaccel;
+extern const AVHWAccel ff_hevc_v4l2request_hwaccel;
 extern const AVHWAccel ff_hevc_vaapi_hwaccel;
 extern const AVHWAccel ff_hevc_vdpau_hwaccel;
 extern const AVHWAccel ff_hevc_videotoolbox_hwaccel;
diff --git a/libavcodec/v4l2_request_hevc.c b/libavcodec/v4l2_request_hevc.c
new file mode 100644
index 000000000000..3e2b9a575ed0
--- /dev/null
+++ b/libavcodec/v4l2_request_hevc.c
@@ -0,0 +1,679 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "hevcdec.h"
+#include "hwconfig.h"
+#include "internal.h"
+#include "v4l2_request.h"
+
+#define MAX_SLICES 600 // as per HEVC spec ?
+#define V4L2_HEVC_CONTROLS_MAX 6
+
+typedef struct V4L2RequestControlsHEVC {
+    struct v4l2_ctrl_hevc_sps sps;
+    struct v4l2_ctrl_hevc_pps pps;
+    struct v4l2_ctrl_hevc_decode_params dec_params;
+    struct v4l2_ctrl_hevc_scaling_matrix scaling_matrix;
+    struct v4l2_ctrl_hevc_slice_params slice_params[MAX_SLICES];
+    __u32 *entry_point_offsets;
+    unsigned int num_entry_point_offsets;
+    int first_slice;
+    int num_slices;
+} V4L2RequestControlsHEVC;
+
+typedef struct V4L2RequestContextHEVC {
+    V4L2RequestContext base;
+    unsigned int decode_mode;
+    unsigned int start_code;
+    __u32 max_slices;
+    unsigned int supports_entry_point_offsets;
+    unsigned int supports_slices;
+    unsigned int supports_scaling_matrix;
+} V4L2RequestContextHEVC;
+
+static uint8_t nalu_slice_start_code[] = { 0x00, 0x00, 0x01 };
+
+static void v4l2_request_hevc_fill_pred_table(const HEVCContext *h, struct v4l2_hevc_pred_weight_table *table)
+{
+    int32_t luma_weight_denom, chroma_weight_denom;
+    const SliceHeader *sh = &h->sh;
+
+    if (sh->slice_type == HEVC_SLICE_I ||
+        (sh->slice_type == HEVC_SLICE_P && !h->ps.pps->weighted_pred_flag) ||
+        (sh->slice_type == HEVC_SLICE_B && !h->ps.pps->weighted_bipred_flag))
+        return;
+
+    table->luma_log2_weight_denom = sh->luma_log2_weight_denom;
+
+    if (h->ps.sps->chroma_format_idc)
+        table->delta_chroma_log2_weight_denom = sh->chroma_log2_weight_denom - sh->luma_log2_weight_denom;
+
+    luma_weight_denom = (1 << sh->luma_log2_weight_denom);
+    chroma_weight_denom = (1 << sh->chroma_log2_weight_denom);
+
+    for (int i = 0; i < 15 && i < sh->nb_refs[L0]; i++) {
+        table->delta_luma_weight_l0[i] = sh->luma_weight_l0[i] - luma_weight_denom;
+        table->luma_offset_l0[i] = sh->luma_offset_l0[i];
+        table->delta_chroma_weight_l0[i][0] = sh->chroma_weight_l0[i][0] - chroma_weight_denom;
+        table->delta_chroma_weight_l0[i][1] = sh->chroma_weight_l0[i][1] - chroma_weight_denom;
+        table->chroma_offset_l0[i][0] = sh->chroma_offset_l0[i][0];
+        table->chroma_offset_l0[i][1] = sh->chroma_offset_l0[i][1];
+    }
+
+    if (sh->slice_type != HEVC_SLICE_B)
+        return;
+
+    for (int i = 0; i < 15 && i < sh->nb_refs[L1]; i++) {
+        table->delta_luma_weight_l1[i] = sh->luma_weight_l1[i] - luma_weight_denom;
+        table->luma_offset_l1[i] = sh->luma_offset_l1[i];
+        table->delta_chroma_weight_l1[i][0] = sh->chroma_weight_l1[i][0] - chroma_weight_denom;
+        table->delta_chroma_weight_l1[i][1] = sh->chroma_weight_l1[i][1] - chroma_weight_denom;
+        table->chroma_offset_l1[i][0] = sh->chroma_offset_l1[i][0];
+        table->chroma_offset_l1[i][1] = sh->chroma_offset_l1[i][1];
+    }
+}
+
+static uint8_t get_ref_pic_index(const HEVCContext *h, const HEVCFrame *frame,
+                                 struct v4l2_ctrl_hevc_decode_params *dec_params)
+{
+    uint64_t timestamp;
+
+    if (!frame)
+        return 0;
+
+    timestamp = ff_v4l2_request_get_capture_timestamp(frame->frame);
+
+    for (uint8_t i = 0; i < dec_params->num_active_dpb_entries; i++) {
+        struct v4l2_hevc_dpb_entry *entry = &dec_params->dpb[i];
+        if (entry->timestamp == timestamp)
+            return i;
+    }
+
+    return 0;
+}
+
+static void fill_dec_params(struct v4l2_ctrl_hevc_decode_params *dec_params, const HEVCContext *h)
+{
+    const HEVCFrame *pic = h->ref;
+    const SliceHeader *sh = &h->sh;
+    int i, entries = 0;
+
+    *dec_params = (struct v4l2_ctrl_hevc_decode_params) {
+        .pic_order_cnt_val = pic->poc, /* FIXME: is this same as slice_params->slice_pic_order_cnt ? */
+        .short_term_ref_pic_set_size = sh->short_term_ref_pic_set_size,
+        .long_term_ref_pic_set_size = sh->long_term_ref_pic_set_size,
+	.num_poc_st_curr_before = h->rps[ST_CURR_BEF].nb_refs,
+        .num_poc_st_curr_after = h->rps[ST_CURR_AFT].nb_refs,
+        .num_poc_lt_curr = h->rps[LT_CURR].nb_refs,
+    };
+
+    for (i = 0; i < FF_ARRAY_ELEMS(h->DPB); i++) {
+        const HEVCFrame *frame = &h->DPB[i];
+        if (frame != pic && (frame->flags & (HEVC_FRAME_FLAG_LONG_REF | HEVC_FRAME_FLAG_SHORT_REF))) {
+            struct v4l2_hevc_dpb_entry *entry = &dec_params->dpb[entries++];
+
+            entry->timestamp = ff_v4l2_request_get_capture_timestamp(frame->frame);
+            entry->field_pic = frame->frame->interlaced_frame;
+            entry->flags = 0;
+            if (frame->flags & HEVC_FRAME_FLAG_LONG_REF)
+                entry->flags |= V4L2_HEVC_DPB_ENTRY_LONG_TERM_REFERENCE;
+
+            entry->pic_order_cnt_val = frame->poc;
+        }
+    }
+
+    dec_params->num_active_dpb_entries = entries;
+
+    if (IS_IRAP(h))
+        dec_params->flags |= V4L2_HEVC_DECODE_PARAM_FLAG_IRAP_PIC;
+
+    if (IS_IDR(h))
+        dec_params->flags |= V4L2_HEVC_DECODE_PARAM_FLAG_IDR_PIC;
+
+    if (sh->no_output_of_prior_pics_flag)
+        dec_params->flags |= V4L2_HEVC_DECODE_PARAM_FLAG_NO_OUTPUT_OF_PRIOR;
+
+    for (i = 0; i < V4L2_HEVC_DPB_ENTRIES_NUM_MAX; i++) {
+        dec_params->poc_st_curr_before[i] = get_ref_pic_index(h, h->rps[ST_CURR_BEF].ref[i], dec_params);
+        dec_params->poc_st_curr_after[i] = get_ref_pic_index(h, h->rps[ST_CURR_AFT].ref[i], dec_params);
+        dec_params->poc_lt_curr[i] = get_ref_pic_index(h, h->rps[LT_CURR].ref[i], dec_params);
+    }
+}
+
+static int v4l2_request_hevc_fill_slice_params(const HEVCContext *h,
+                                               V4L2RequestControlsHEVC *controls,
+                                               int slice)
+{
+    struct v4l2_ctrl_hevc_slice_params *slice_params = &controls->slice_params[slice];
+    struct v4l2_ctrl_hevc_decode_params *dec_params = &controls->dec_params;
+    const HEVCFrame *pic = h->ref;
+    const SliceHeader *sh = &h->sh;
+    RefPicList *rpl;
+    int i;
+
+    *slice_params = (struct v4l2_ctrl_hevc_slice_params) {
+        .bit_size = 0,
+        .data_byte_offset = (get_bits_count(&h->HEVClc->gb) + 1 + 7) / 8,
+        .num_entry_point_offsets = sh->num_entry_point_offsets,
+
+        /* ISO/IEC 23008-2, ITU-T Rec. H.265: NAL unit header */
+        .nal_unit_type = h->nal_unit_type,
+        .nuh_temporal_id_plus1 = h->temporal_id + 1,
+
+        /* ISO/IEC 23008-2, ITU-T Rec. H.265: General slice segment header */
+        .slice_type = sh->slice_type,
+        .colour_plane_id = sh->colour_plane_id,
+        .slice_pic_order_cnt = pic->poc,
+        .num_ref_idx_l0_active_minus1 = sh->nb_refs[L0] ? sh->nb_refs[L0] - 1 : 0,
+        .num_ref_idx_l1_active_minus1 = sh->nb_refs[L1] ? sh->nb_refs[L1] - 1 : 0,
+        .collocated_ref_idx = sh->slice_temporal_mvp_enabled_flag ? sh->collocated_ref_idx : 0,
+        .five_minus_max_num_merge_cand = sh->slice_type == HEVC_SLICE_I ? 0 : 5 - sh->max_num_merge_cand,
+        .slice_qp_delta = sh->slice_qp_delta,
+        .slice_cb_qp_offset = sh->slice_cb_qp_offset,
+        .slice_cr_qp_offset = sh->slice_cr_qp_offset,
+        .slice_act_y_qp_offset = 0,
+        .slice_act_cb_qp_offset = 0,
+        .slice_act_cr_qp_offset = 0,
+        .slice_beta_offset_div2 = sh->beta_offset / 2,
+        .slice_tc_offset_div2 = sh->tc_offset / 2,
+
+        /* ISO/IEC 23008-2, ITU-T Rec. H.265: Picture timing SEI message */
+        .pic_struct = h->sei.picture_timing.picture_struct,
+
+        /* ISO/IEC 23008-2, ITU-T Rec. H.265: General slice segment header */
+        .slice_segment_addr = sh->slice_segment_addr,
+        .short_term_ref_pic_set_size = sh->short_term_ref_pic_set_size,
+        .long_term_ref_pic_set_size = sh->long_term_ref_pic_set_size,
+    };
+
+    if (sh->slice_sample_adaptive_offset_flag[0])
+        slice_params->flags |= V4L2_HEVC_SLICE_PARAMS_FLAG_SLICE_SAO_LUMA;
+
+    if (sh->slice_sample_adaptive_offset_flag[1])
+        slice_params->flags |= V4L2_HEVC_SLICE_PARAMS_FLAG_SLICE_SAO_CHROMA;
+
+    if (sh->slice_temporal_mvp_enabled_flag)
+        slice_params->flags |= V4L2_HEVC_SLICE_PARAMS_FLAG_SLICE_TEMPORAL_MVP_ENABLED;
+
+    if (sh->mvd_l1_zero_flag)
+        slice_params->flags |= V4L2_HEVC_SLICE_PARAMS_FLAG_MVD_L1_ZERO;
+
+    if (sh->cabac_init_flag)
+        slice_params->flags |= V4L2_HEVC_SLICE_PARAMS_FLAG_CABAC_INIT;
+
+    if (sh->collocated_list == L0)
+        slice_params->flags |= V4L2_HEVC_SLICE_PARAMS_FLAG_COLLOCATED_FROM_L0;
+
+    /* TODO: V4L2_HEVC_SLICE_PARAMS_FLAG_USE_INTEGER_MV */
+
+    if (sh->disable_deblocking_filter_flag)
+        slice_params->flags |= V4L2_HEVC_SLICE_PARAMS_FLAG_SLICE_DEBLOCKING_FILTER_DISABLED;
+
+    if (sh->slice_loop_filter_across_slices_enabled_flag)
+        slice_params->flags |= V4L2_HEVC_SLICE_PARAMS_FLAG_SLICE_LOOP_FILTER_ACROSS_SLICES_ENABLED;
+
+    if (sh->dependent_slice_segment_flag)
+        slice_params->flags |= V4L2_HEVC_SLICE_PARAMS_FLAG_DEPENDENT_SLICE_SEGMENT;
+
+    if (sh->slice_type != HEVC_SLICE_I) {
+        rpl = &h->ref->refPicList[0];
+        for (i = 0; i < rpl->nb_refs; i++)
+            slice_params->ref_idx_l0[i] = get_ref_pic_index(h, rpl->ref[i], dec_params);
+    }
+
+    if (sh->slice_type == HEVC_SLICE_B) {
+        rpl = &h->ref->refPicList[1];
+        for (i = 0; i < rpl->nb_refs; i++)
+            slice_params->ref_idx_l1[i] = get_ref_pic_index(h, rpl->ref[i], dec_params);
+    }
+
+    v4l2_request_hevc_fill_pred_table(h, &slice_params->pred_weight_table);
+
+    if (controls->num_entry_point_offsets < sh->num_entry_point_offsets) {
+        av_freep(&controls->entry_point_offsets);
+        controls->entry_point_offsets = av_mallocz(sizeof(*controls->entry_point_offsets) * sh->num_entry_point_offsets);
+        if (!controls->entry_point_offsets)
+            return AVERROR(ENOMEM);
+        controls->num_entry_point_offsets = sh->num_entry_point_offsets;
+    }
+
+    for (i = 0; i < sh->num_entry_point_offsets; i++)
+        controls->entry_point_offsets[i] = sh->entry_point_offset[i];
+
+    return 0;
+}
+
+static void fill_sps(struct v4l2_ctrl_hevc_sps *ctrl, const HEVCContext *h)
+{
+    const HEVCSPS *sps = h->ps.sps;
+    const HEVCPPS *pps = h->ps.pps;
+
+    /* ISO/IEC 23008-2, ITU-T Rec. H.265: Sequence parameter set */
+    *ctrl = (struct v4l2_ctrl_hevc_sps) {
+        .video_parameter_set_id = sps->vps_id,
+        .seq_parameter_set_id = pps->sps_id,
+        .pic_width_in_luma_samples = sps->width,
+        .pic_height_in_luma_samples = sps->height,
+        .bit_depth_luma_minus8 = sps->bit_depth - 8,
+        .bit_depth_chroma_minus8 = sps->bit_depth_chroma - 8,
+        .log2_max_pic_order_cnt_lsb_minus4 = sps->log2_max_poc_lsb - 4,
+        .sps_max_dec_pic_buffering_minus1 = sps->temporal_layer[sps->max_sub_layers - 1].max_dec_pic_buffering - 1,
+        .sps_max_num_reorder_pics = sps->temporal_layer[sps->max_sub_layers - 1].num_reorder_pics,
+        .sps_max_latency_increase_plus1 = sps->temporal_layer[sps->max_sub_layers - 1].max_latency_increase + 1,
+        .log2_min_luma_coding_block_size_minus3 = sps->log2_min_cb_size - 3,
+        .log2_diff_max_min_luma_coding_block_size = sps->log2_diff_max_min_coding_block_size,
+        .log2_min_luma_transform_block_size_minus2 = sps->log2_min_tb_size - 2,
+        .log2_diff_max_min_luma_transform_block_size = sps->log2_max_trafo_size - sps->log2_min_tb_size,
+        .max_transform_hierarchy_depth_inter = sps->max_transform_hierarchy_depth_inter,
+        .max_transform_hierarchy_depth_intra = sps->max_transform_hierarchy_depth_intra,
+        .pcm_sample_bit_depth_luma_minus1 = sps->pcm.bit_depth - 1,
+        .pcm_sample_bit_depth_chroma_minus1 = sps->pcm.bit_depth_chroma - 1,
+        .log2_min_pcm_luma_coding_block_size_minus3 = sps->pcm.log2_min_pcm_cb_size - 3,
+        .log2_diff_max_min_pcm_luma_coding_block_size = sps->pcm.log2_max_pcm_cb_size - sps->pcm.log2_min_pcm_cb_size,
+        .num_short_term_ref_pic_sets = sps->nb_st_rps,
+        .num_long_term_ref_pics_sps = sps->num_long_term_ref_pics_sps,
+        .chroma_format_idc = sps->chroma_format_idc,
+        .sps_max_sub_layers_minus1 = sps->max_sub_layers - 1,
+    };
+
+    if (sps->separate_colour_plane_flag)
+        ctrl->flags |= V4L2_HEVC_SPS_FLAG_SEPARATE_COLOUR_PLANE;
+
+    if (sps->scaling_list_enable_flag)
+        ctrl->flags |= V4L2_HEVC_SPS_FLAG_SCALING_LIST_ENABLED;
+
+    if (sps->amp_enabled_flag)
+        ctrl->flags |= V4L2_HEVC_SPS_FLAG_AMP_ENABLED;
+
+    if (sps->sao_enabled)
+        ctrl->flags |= V4L2_HEVC_SPS_FLAG_SAMPLE_ADAPTIVE_OFFSET;
+
+    if (sps->pcm_enabled_flag)
+        ctrl->flags |= V4L2_HEVC_SPS_FLAG_PCM_ENABLED;
+
+    if (sps->pcm.loop_filter_disable_flag)
+        ctrl->flags |= V4L2_HEVC_SPS_FLAG_PCM_LOOP_FILTER_DISABLED;
+
+    if (sps->long_term_ref_pics_present_flag)
+        ctrl->flags |= V4L2_HEVC_SPS_FLAG_LONG_TERM_REF_PICS_PRESENT;
+
+    if (sps->sps_temporal_mvp_enabled_flag)
+        ctrl->flags |= V4L2_HEVC_SPS_FLAG_SPS_TEMPORAL_MVP_ENABLED;
+
+    if (sps->sps_strong_intra_smoothing_enable_flag)
+        ctrl->flags |= V4L2_HEVC_SPS_FLAG_STRONG_INTRA_SMOOTHING_ENABLED;
+}
+
+static int v4l2_request_hevc_start_frame(AVCodecContext *avctx,
+                                         av_unused const uint8_t *buffer,
+                                         av_unused uint32_t size)
+{
+    const HEVCContext *h = avctx->priv_data;
+    const HEVCPPS *pps = h->ps.pps;
+    const HEVCSPS *sps = h->ps.sps;
+    const ScalingList *sl = pps->scaling_list_data_present_flag ?
+                            &pps->scaling_list :
+                            sps->scaling_list_enable_flag ?
+                            &sps->scaling_list : NULL;
+    V4L2RequestControlsHEVC *controls = h->ref->hwaccel_picture_private;
+    const SliceHeader *sh = &h->sh;
+
+    fill_sps(&controls->sps, h);
+    fill_dec_params(&controls->dec_params, h);
+
+    if (sl) {
+        for (int i = 0; i < 6; i++) {
+            for (int j = 0; j < 16; j++)
+                controls->scaling_matrix.scaling_list_4x4[i][j] = sl->sl[0][i][j];
+            for (int j = 0; j < 64; j++) {
+                controls->scaling_matrix.scaling_list_8x8[i][j]   = sl->sl[1][i][j];
+                controls->scaling_matrix.scaling_list_16x16[i][j] = sl->sl[2][i][j];
+                if (i < 2)
+                    controls->scaling_matrix.scaling_list_32x32[i][j] = sl->sl[3][i * 3][j];
+            }
+            controls->scaling_matrix.scaling_list_dc_coef_16x16[i] = sl->sl_dc[0][i];
+            if (i < 2)
+                controls->scaling_matrix.scaling_list_dc_coef_32x32[i] = sl->sl_dc[1][i * 3];
+        }
+    }
+
+    /* ISO/IEC 23008-2, ITU-T Rec. H.265: Picture parameter set */
+    controls->pps = (struct v4l2_ctrl_hevc_pps) {
+        .pic_parameter_set_id = sh->pps_id,
+        .num_extra_slice_header_bits = pps->num_extra_slice_header_bits,
+        .num_ref_idx_l0_default_active_minus1 = pps->num_ref_idx_l0_default_active - 1,
+        .num_ref_idx_l1_default_active_minus1 = pps->num_ref_idx_l1_default_active - 1,
+        .init_qp_minus26 = pps->pic_init_qp_minus26,
+        .diff_cu_qp_delta_depth = pps->diff_cu_qp_delta_depth,
+        .pps_cb_qp_offset = pps->cb_qp_offset,
+        .pps_cr_qp_offset = pps->cr_qp_offset,
+        .pps_beta_offset_div2 = pps->beta_offset / 2,
+        .pps_tc_offset_div2 = pps->tc_offset / 2,
+        .log2_parallel_merge_level_minus2 = pps->log2_parallel_merge_level - 2,
+    };
+
+    if (pps->dependent_slice_segments_enabled_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_DEPENDENT_SLICE_SEGMENT_ENABLED;
+
+    if (pps->output_flag_present_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_OUTPUT_FLAG_PRESENT;
+
+    if (pps->sign_data_hiding_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_SIGN_DATA_HIDING_ENABLED;
+
+    if (pps->cabac_init_present_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_CABAC_INIT_PRESENT;
+
+    if (pps->constrained_intra_pred_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_CONSTRAINED_INTRA_PRED;
+
+    if (pps->transform_skip_enabled_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_TRANSFORM_SKIP_ENABLED;
+
+    if (pps->cu_qp_delta_enabled_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_CU_QP_DELTA_ENABLED;
+
+    if (pps->pic_slice_level_chroma_qp_offsets_present_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_PPS_SLICE_CHROMA_QP_OFFSETS_PRESENT;
+
+    if (pps->weighted_pred_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_WEIGHTED_PRED;
+
+    if (pps->weighted_bipred_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_WEIGHTED_BIPRED;
+
+    if (pps->transquant_bypass_enable_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_TRANSQUANT_BYPASS_ENABLED;
+
+    if (pps->tiles_enabled_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_TILES_ENABLED;
+
+    if (pps->entropy_coding_sync_enabled_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_ENTROPY_CODING_SYNC_ENABLED;
+
+    if (pps->loop_filter_across_tiles_enabled_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_LOOP_FILTER_ACROSS_TILES_ENABLED;
+
+    if (pps->seq_loop_filter_across_slices_enabled_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_PPS_LOOP_FILTER_ACROSS_SLICES_ENABLED;
+
+    if (pps->deblocking_filter_override_enabled_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_DEBLOCKING_FILTER_OVERRIDE_ENABLED;
+
+    if (pps->disable_dbf)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_PPS_DISABLE_DEBLOCKING_FILTER;
+
+    if (pps->lists_modification_present_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_LISTS_MODIFICATION_PRESENT;
+
+    if (pps->slice_header_extension_present_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_SLICE_SEGMENT_HEADER_EXTENSION_PRESENT;
+
+    if (pps->deblocking_filter_control_present_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT;
+
+    if (pps->uniform_spacing_flag)
+        controls->pps.flags |= V4L2_HEVC_PPS_FLAG_UNIFORM_SPACING;
+
+    if (pps->tiles_enabled_flag) {
+        controls->pps.num_tile_columns_minus1 = pps->num_tile_columns - 1;
+        controls->pps.num_tile_rows_minus1 = pps->num_tile_rows - 1;
+
+        for (int i = 0; i < pps->num_tile_columns; i++)
+            controls->pps.column_width_minus1[i] = pps->column_width[i] - 1;
+
+        for (int i = 0; i < pps->num_tile_rows; i++)
+            controls->pps.row_height_minus1[i] = pps->row_height[i] - 1;
+    }
+
+    controls->first_slice = 1;
+    controls->num_slices = 0;
+    controls->num_entry_point_offsets = 0;
+
+    return ff_v4l2_request_reset_frame(avctx, h->ref->frame);
+}
+
+static int v4l2_request_hevc_queue_decode(AVCodecContext *avctx, int last_slice)
+{
+    const HEVCContext *h = avctx->priv_data;
+    V4L2RequestControlsHEVC *controls = h->ref->hwaccel_picture_private;
+    struct v4l2_ctrl_hevc_slice_params *first_slice_params = &controls->slice_params[0];
+    V4L2RequestContextHEVC *ctx = avctx->internal->hwaccel_priv_data;
+    int num_controls = 0;
+
+    struct v4l2_ext_control control[V4L2_HEVC_CONTROLS_MAX] = {};
+
+    control[num_controls++] = (struct v4l2_ext_control) {
+            .id = V4L2_CID_STATELESS_HEVC_SPS,
+            .ptr = &controls->sps,
+            .size = sizeof(controls->sps),
+    };
+
+    control[num_controls++] = (struct v4l2_ext_control) {
+            .id = V4L2_CID_STATELESS_HEVC_PPS,
+            .ptr = &controls->pps,
+            .size = sizeof(controls->pps),
+    };
+
+    control[num_controls++] = (struct v4l2_ext_control) {
+         .id = V4L2_CID_STATELESS_HEVC_DECODE_PARAMS,
+         .ptr = &controls->dec_params,
+         .size = sizeof(controls->dec_params),
+    };
+
+    if (ctx->supports_scaling_matrix)
+       control[num_controls++] = (struct v4l2_ext_control) {
+            .id = V4L2_CID_STATELESS_HEVC_SCALING_MATRIX,
+            .ptr = &controls->scaling_matrix,
+            .size = sizeof(controls->scaling_matrix),
+        };
+
+    if (ctx->supports_slices)
+       control[num_controls++] = (struct v4l2_ext_control) {
+            .id = V4L2_CID_STATELESS_HEVC_SLICE_PARAMS,
+            .ptr = &controls->slice_params,
+            .size = sizeof(*first_slice_params) * controls->num_slices,
+        };
+
+    //this assumes that decoders supporting entry_point_offsets submit a single slice per request
+    if (ctx->supports_entry_point_offsets && first_slice_params->num_entry_point_offsets > 0)
+       control[num_controls++] = (struct v4l2_ext_control) {
+            .id = V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSETS,
+            .ptr = controls->entry_point_offsets,
+            .size = sizeof(*controls->entry_point_offsets) * first_slice_params->num_entry_point_offsets,
+        };
+
+    if (ctx->decode_mode == V4L2_STATELESS_HEVC_DECODE_MODE_SLICE_BASED)
+        return ff_v4l2_request_decode_slice(avctx, h->ref->frame, control, num_controls, controls->first_slice, last_slice);
+
+    return ff_v4l2_request_decode_frame(avctx, h->ref->frame, control, num_controls);
+}
+
+static int v4l2_request_hevc_decode_slice(AVCodecContext *avctx, const uint8_t *buffer, uint32_t size)
+{
+    const HEVCContext *h = avctx->priv_data;
+    V4L2RequestControlsHEVC *controls = h->ref->hwaccel_picture_private;
+    V4L2RequestContextHEVC *ctx = avctx->internal->hwaccel_priv_data;
+    V4L2RequestDescriptor *req = (V4L2RequestDescriptor*)h->ref->frame->data[0];
+    int ret, slice = FFMIN(controls->num_slices, MAX_SLICES - 1);
+
+    if (ctx->decode_mode == V4L2_STATELESS_HEVC_DECODE_MODE_SLICE_BASED && slice) {
+        ret = v4l2_request_hevc_queue_decode(avctx, 0);
+        if (ret)
+            return ret;
+
+        ff_v4l2_request_reset_frame(avctx, h->ref->frame);
+        slice = controls->num_slices = 0;
+        controls->first_slice = 0;
+    }
+
+    ret = v4l2_request_hevc_fill_slice_params(h, controls, slice);
+    if (ret)
+        return ret;
+
+    if (ctx->start_code == V4L2_STATELESS_HEVC_START_CODE_ANNEX_B) {
+        ret = ff_v4l2_request_append_output_buffer(avctx, h->ref->frame, nalu_slice_start_code, 3);
+        if (ret)
+            return ret;
+    }
+
+    ret = ff_v4l2_request_append_output_buffer(avctx, h->ref->frame, buffer, size);
+    if (ret)
+        return ret;
+
+    controls->slice_params[slice].bit_size = req->output.used * 8; //FIXME
+    controls->num_slices++;
+    return 0;
+}
+
+static int v4l2_request_hevc_end_frame(AVCodecContext *avctx)
+{
+    const HEVCContext *h = avctx->priv_data;
+    V4L2RequestControlsHEVC *controls = h->ref->hwaccel_picture_private;
+    int ret;
+
+    ret = v4l2_request_hevc_queue_decode(avctx, 1);
+
+    av_freep(&controls->entry_point_offsets);
+
+    return ret;
+}
+
+static int v4l2_request_hevc_set_controls(AVCodecContext *avctx)
+{
+    V4L2RequestContextHEVC *ctx = avctx->internal->hwaccel_priv_data;
+    int ret;
+
+    struct v4l2_ext_control control[] = {
+        { .id = V4L2_CID_STATELESS_HEVC_DECODE_MODE, },
+        { .id = V4L2_CID_STATELESS_HEVC_START_CODE, },
+    };
+    struct v4l2_query_ext_ctrl entry_point_offsets = {
+        .id = V4L2_CID_STATELESS_HEVC_ENTRY_POINT_OFFSETS,
+    };
+    struct v4l2_query_ext_ctrl slice_params = {
+        .id = V4L2_CID_STATELESS_HEVC_SLICE_PARAMS,
+    };
+    struct v4l2_query_ext_ctrl scaling_matrix = {
+        .id = V4L2_CID_STATELESS_HEVC_SCALING_MATRIX,
+    };
+
+    ctx->decode_mode = ff_v4l2_request_query_control_default_value(avctx, V4L2_CID_STATELESS_HEVC_DECODE_MODE);
+    if (ctx->decode_mode != V4L2_STATELESS_HEVC_DECODE_MODE_SLICE_BASED &&
+        ctx->decode_mode != V4L2_STATELESS_HEVC_DECODE_MODE_FRAME_BASED) {
+        av_log(avctx, AV_LOG_ERROR, "%s: unsupported decode mode, %d\n", __func__, ctx->decode_mode);
+        return AVERROR(EINVAL);
+    }
+
+    ctx->start_code = ff_v4l2_request_query_control_default_value(avctx, V4L2_CID_STATELESS_HEVC_START_CODE);
+    if (ctx->start_code != V4L2_STATELESS_HEVC_START_CODE_NONE &&
+        ctx->start_code != V4L2_STATELESS_HEVC_START_CODE_ANNEX_B) {
+        av_log(avctx, AV_LOG_ERROR, "%s: unsupported start code, %d\n", __func__, ctx->start_code);
+        return AVERROR(EINVAL);
+    }
+
+    ret = ff_v4l2_request_query_control(avctx, &entry_point_offsets);
+    if (ret) {
+      ctx->supports_entry_point_offsets = 0;
+    } else {
+      ctx->supports_entry_point_offsets = 1;
+    }
+
+    ret = ff_v4l2_request_query_control(avctx, &slice_params);
+    if (ret) {
+      ctx->supports_slices = 0;
+      ctx->max_slices = 0;
+      if (ctx->decode_mode == V4L2_STATELESS_HEVC_DECODE_MODE_SLICE_BASED) {
+        av_log(avctx, AV_LOG_ERROR, "%s: decoder is slice-based, \
+               but doesn't support V4L2_CID_STATELESS_HEVC_SLICE_PARAMS control \n", __func__);
+        return AVERROR(EINVAL);
+      }
+
+      if (ctx->supports_entry_point_offsets) {
+        av_log(avctx, AV_LOG_ERROR, "%s: decoder supports entry_point_offsets, \
+               but doesn't support V4L2_CID_STATELESS_HEVC_SLICE_PARAMS control \n", __func__);
+        return AVERROR(EINVAL);
+      }
+    } else {
+      ctx->supports_slices = 1;
+      ctx->max_slices = slice_params.dims[0];
+      if (ctx->max_slices > MAX_SLICES) {
+        av_log(avctx, AV_LOG_ERROR, "%s: unsupported max slices, %u\n", __func__, ctx->max_slices);
+        return AVERROR(EINVAL);
+      }
+    }
+
+    ret = ff_v4l2_request_query_control(avctx, &scaling_matrix);
+    if (ret)
+      ctx->supports_scaling_matrix = 0;
+    else
+      ctx->supports_scaling_matrix = 1;
+
+    av_log(avctx, AV_LOG_DEBUG, "%s: decoder is %s and supports slices %d, supports entry_point_offsets: %d supports scaling_matrix: %d max slices: %u\n",
+           __func__,
+          ctx->decode_mode == V4L2_STATELESS_HEVC_DECODE_MODE_SLICE_BASED ? "slice based" : "frame based",
+          ctx->supports_slices,
+          ctx->supports_entry_point_offsets,
+          ctx->supports_scaling_matrix,
+          ctx->max_slices
+    );
+
+    control[0].value = ctx->decode_mode;
+    control[1].value = ctx->start_code;
+
+    return ff_v4l2_request_set_controls(avctx, control, FF_ARRAY_ELEMS(control));
+}
+
+static int v4l2_request_hevc_init(AVCodecContext *avctx)
+{
+    const HEVCContext *h = avctx->priv_data;
+    struct v4l2_ctrl_hevc_sps sps;
+    int ret;
+
+    struct v4l2_ext_control control[] = {
+        {
+            .id = V4L2_CID_STATELESS_HEVC_SPS,
+            .ptr = &sps,
+            .size = sizeof(sps),
+        },
+    };
+
+    fill_sps(&sps, h);
+
+    ret = ff_v4l2_request_init(avctx, V4L2_PIX_FMT_HEVC_SLICE, 4 * 1024 * 1024, control, FF_ARRAY_ELEMS(control));
+    if (ret)
+        return ret;
+
+    return v4l2_request_hevc_set_controls(avctx);
+}
+
+const AVHWAccel ff_hevc_v4l2request_hwaccel = {
+    .name           = "hevc_v4l2request",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_HEVC,
+    .pix_fmt        = AV_PIX_FMT_DRM_PRIME,
+    .start_frame    = v4l2_request_hevc_start_frame,
+    .decode_slice   = v4l2_request_hevc_decode_slice,
+    .end_frame      = v4l2_request_hevc_end_frame,
+    .frame_priv_data_size = sizeof(V4L2RequestControlsHEVC),
+    .init           = v4l2_request_hevc_init,
+    .uninit         = ff_v4l2_request_uninit,
+    .priv_data_size = sizeof(V4L2RequestContextHEVC),
+    .frame_params   = ff_v4l2_request_frame_params,
+    .caps_internal  = HWACCEL_CAP_ASYNC_SAFE,
+};