avcodec: Add common V4L2 Request API code
Add common helpers for supporting V4L2 Request API hwaccels. Basic flow for initialization follow the kernel Memory-to-memory Stateless Video Decoder Interface > Initialization [1]. In init video devices is probed and when a capable device is found it is initialized for decoding. Codec specific CONTROLs may be set to assist kernel driver. A supported CAPTURE format is selected. A hw frame ctx is created and CAPTURE buffers is allocated. OUTPUT buffers and request objects for a circular queue is also allocated. In frame_params a buffer pool is created and configured to allocate CAPTURE buffers. In flush all queued OUTPUT and CAPTURE buffers is dequeued. In uninit any pending request is flushed, also video and media device is closed. The media device is not closed when ownership of the media_fd has been transfered to the hwdevice. [1] https://www.kernel.org/doc/html/latest/userspace-api/media/v4l/dev-stateless-decoder.html#initialization Co-developed-by: Jernej Skrabec <jernej.skrabec@gmail.com> Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com> Co-developed-by: Alex Bee <knaerzche@gmail.com> Signed-off-by: Alex Bee <knaerzche@gmail.com> Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
This commit is contained in:
Jonas Karlman
Your Name
parent
4216090524
commit
2c23dd4ddb
5 changed files with 569 additions and 0 deletions
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@ -278,6 +278,7 @@ Hardware acceleration:
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d3d11va* Steve Lhomme
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d3d12va_encode* Tong Wu
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mediacodec* Matthieu Bouron, Aman Gupta, Zhao Zhili
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v4l2_request* Jonas Karlman (CC jonas@kwiboo.se)
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vaapi* Haihao Xiang
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vaapi_encode* Mark Thompson, Haihao Xiang
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vdpau* Philip Langdale, Carl Eugen Hoyos
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@ -176,6 +176,7 @@ OBJS-$(CONFIG_VP3DSP) += vp3dsp.o
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OBJS-$(CONFIG_VP56DSP) += vp56dsp.o
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OBJS-$(CONFIG_VP8DSP) += vp8dsp.o
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OBJS-$(CONFIG_V4L2_M2M) += v4l2_m2m.o v4l2_context.o v4l2_buffers.o v4l2_fmt.o
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OBJS-$(CONFIG_V4L2_REQUEST) += v4l2_request.o
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OBJS-$(CONFIG_WMA_FREQS) += wma_freqs.o
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OBJS-$(CONFIG_WMV2DSP) += wmv2dsp.o
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441
libavcodec/v4l2_request.c
Normal file
441
libavcodec/v4l2_request.c
Normal file
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@ -0,0 +1,441 @@
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include "libavutil/hwcontext_v4l2request.h"
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#include "libavutil/mem.h"
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#include "decode.h"
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#include "v4l2_request_internal.h"
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static const AVClass v4l2_request_context_class = {
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.class_name = "V4L2RequestContext",
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.item_name = av_default_item_name,
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.version = LIBAVUTIL_VERSION_INT,
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};
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int ff_v4l2_request_query_control(AVCodecContext *avctx,
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struct v4l2_query_ext_ctrl *control)
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{
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V4L2RequestContext *ctx = v4l2_request_context(avctx);
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if (ioctl(ctx->video_fd, VIDIOC_QUERY_EXT_CTRL, control) < 0) {
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// Skip error logging when driver does not support control id (EINVAL)
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if (errno != EINVAL) {
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av_log(ctx, AV_LOG_ERROR, "Failed to query control %u: %s (%d)\n",
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control->id, strerror(errno), errno);
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}
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return AVERROR(errno);
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}
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return 0;
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}
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int ff_v4l2_request_query_control_default_value(AVCodecContext *avctx,
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uint32_t id)
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{
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struct v4l2_query_ext_ctrl control = {
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.id = id,
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};
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int ret;
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ret = ff_v4l2_request_query_control(avctx, &control);
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if (ret < 0)
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return ret;
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return control.default_value;
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}
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int ff_v4l2_request_set_request_controls(V4L2RequestContext *ctx, int request_fd,
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struct v4l2_ext_control *control, int count)
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{
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struct v4l2_ext_controls controls = {
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.controls = control,
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.count = count,
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.request_fd = request_fd,
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.which = (request_fd >= 0) ? V4L2_CTRL_WHICH_REQUEST_VAL : 0,
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};
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if (!control || !count)
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return 0;
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if (ioctl(ctx->video_fd, VIDIOC_S_EXT_CTRLS, &controls) < 0)
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return AVERROR(errno);
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return 0;
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}
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int ff_v4l2_request_set_controls(AVCodecContext *avctx,
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struct v4l2_ext_control *control, int count)
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{
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V4L2RequestContext *ctx = v4l2_request_context(avctx);
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int ret;
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ret = ff_v4l2_request_set_request_controls(ctx, -1, control, count);
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if (ret < 0) {
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av_log(ctx, AV_LOG_ERROR, "Failed to set %d control(s): %s (%d)\n",
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count, strerror(errno), errno);
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}
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return ret;
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}
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static int v4l2_request_buffer_alloc(V4L2RequestContext *ctx,
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V4L2RequestBuffer *buf,
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enum v4l2_buf_type type)
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{
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struct v4l2_plane planes[1] = {};
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struct v4l2_create_buffers buffers = {
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.count = 1,
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.memory = V4L2_MEMORY_MMAP,
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.format.type = type,
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};
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// Get format details for the buffer to be created
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if (ioctl(ctx->video_fd, VIDIOC_G_FMT, &buffers.format) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Failed to get format of type %d: %s (%d)\n",
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type, strerror(errno), errno);
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return AVERROR(errno);
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}
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// Create the buffer
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if (ioctl(ctx->video_fd, VIDIOC_CREATE_BUFS, &buffers) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Failed to create buffer of type %d: %s (%d)\n",
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type, strerror(errno), errno);
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return AVERROR(errno);
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}
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if (V4L2_TYPE_IS_MULTIPLANAR(type)) {
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buf->width = buffers.format.fmt.pix_mp.width;
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buf->height = buffers.format.fmt.pix_mp.height;
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buf->size = buffers.format.fmt.pix_mp.plane_fmt[0].sizeimage;
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buf->buffer.length = 1;
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buf->buffer.m.planes = planes;
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} else {
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buf->width = buffers.format.fmt.pix.width;
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buf->height = buffers.format.fmt.pix.height;
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buf->size = buffers.format.fmt.pix.sizeimage;
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}
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buf->index = buffers.index;
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buf->capabilities = buffers.capabilities;
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buf->used = 0;
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buf->buffer.type = type;
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buf->buffer.memory = V4L2_MEMORY_MMAP;
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buf->buffer.index = buf->index;
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// Query more details of the created buffer
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if (ioctl(ctx->video_fd, VIDIOC_QUERYBUF, &buf->buffer) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Failed to query buffer %d of type %d: %s (%d)\n",
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buf->index, type, strerror(errno), errno);
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return AVERROR(errno);
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}
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// Output buffers is mapped and capture buffers is exported
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if (V4L2_TYPE_IS_OUTPUT(type)) {
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off_t offset = V4L2_TYPE_IS_MULTIPLANAR(type) ?
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buf->buffer.m.planes[0].m.mem_offset :
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buf->buffer.m.offset;
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void *addr = mmap(NULL, buf->size, PROT_READ | PROT_WRITE, MAP_SHARED,
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ctx->video_fd, offset);
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if (addr == MAP_FAILED) {
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av_log(ctx, AV_LOG_ERROR, "Failed to map output buffer %d: %s (%d)\n",
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buf->index, strerror(errno), errno);
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return AVERROR(errno);
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}
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// Raw bitstream data is appended to output buffers
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buf->addr = (uint8_t *)addr;
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} else {
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struct v4l2_exportbuffer exportbuffer = {
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.type = type,
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.index = buf->index,
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.flags = O_RDONLY,
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};
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if (ioctl(ctx->video_fd, VIDIOC_EXPBUF, &exportbuffer) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Failed to export capture buffer %d: %s (%d)\n",
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buf->index, strerror(errno), errno);
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return AVERROR(errno);
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}
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// Used in the AVDRMFrameDescriptor for decoded frames
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buf->fd = exportbuffer.fd;
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/*
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* Use buffer index as base for V4L2 frame reference.
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* This works because a capture buffer is closely tied to a AVFrame
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* and FFmpeg handle all frame reference tracking for us.
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*/
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buf->buffer.timestamp.tv_usec = buf->index + 1;
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}
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return 0;
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}
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static void v4l2_request_buffer_free(V4L2RequestBuffer *buf)
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{
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// Unmap output buffers
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if (buf->addr) {
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munmap(buf->addr, buf->size);
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buf->addr = NULL;
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}
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// Close exported capture buffers or requests for output buffers
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if (buf->fd >= 0) {
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close(buf->fd);
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buf->fd = -1;
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}
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}
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static void v4l2_request_frame_free(void *opaque, uint8_t *data)
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{
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V4L2RequestFrameDescriptor *desc = (V4L2RequestFrameDescriptor *)data;
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v4l2_request_buffer_free(&desc->capture);
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av_free(data);
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}
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static AVBufferRef *v4l2_request_frame_alloc(void *opaque, size_t size)
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{
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V4L2RequestContext *ctx = opaque;
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V4L2RequestFrameDescriptor *desc;
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AVBufferRef *ref;
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uint8_t *data;
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data = av_mallocz(size);
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if (!data)
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return NULL;
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ref = av_buffer_create(data, size, v4l2_request_frame_free, ctx, 0);
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if (!ref) {
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av_free(data);
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return NULL;
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}
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desc = (V4L2RequestFrameDescriptor *)data;
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desc->capture.fd = -1;
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// Create a V4L2 capture buffer for this AVFrame
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if (v4l2_request_buffer_alloc(ctx, &desc->capture, ctx->format.type) < 0) {
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av_buffer_unref(&ref);
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return NULL;
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}
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// TODO: Set AVDRMFrameDescriptor of this AVFrame
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return ref;
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}
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static void v4l2_request_hwframe_ctx_free(AVHWFramesContext *hwfc)
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{
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av_buffer_pool_uninit(&hwfc->pool);
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}
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int ff_v4l2_request_frame_params(AVCodecContext *avctx,
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AVBufferRef *hw_frames_ctx)
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{
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V4L2RequestContext *ctx = v4l2_request_context(avctx);
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AVHWFramesContext *hwfc = (AVHWFramesContext *)hw_frames_ctx->data;
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hwfc->format = AV_PIX_FMT_DRM_PRIME;
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// TODO: Set sw_format based on capture buffer format
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hwfc->sw_format = AV_PIX_FMT_NONE;
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if (V4L2_TYPE_IS_MULTIPLANAR(ctx->format.type)) {
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hwfc->width = ctx->format.fmt.pix_mp.width;
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hwfc->height = ctx->format.fmt.pix_mp.height;
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} else {
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hwfc->width = ctx->format.fmt.pix.width;
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hwfc->height = ctx->format.fmt.pix.height;
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}
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hwfc->pool = av_buffer_pool_init2(sizeof(V4L2RequestFrameDescriptor), ctx,
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v4l2_request_frame_alloc, NULL);
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if (!hwfc->pool)
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return AVERROR(ENOMEM);
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hwfc->free = v4l2_request_hwframe_ctx_free;
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hwfc->initial_pool_size = 1;
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switch (avctx->codec_id) {
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case AV_CODEC_ID_VP9:
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hwfc->initial_pool_size += 8;
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break;
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case AV_CODEC_ID_VP8:
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hwfc->initial_pool_size += 3;
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break;
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default:
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hwfc->initial_pool_size += 2;
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}
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return 0;
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}
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int ff_v4l2_request_uninit(AVCodecContext *avctx)
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{
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V4L2RequestContext *ctx = v4l2_request_context(avctx);
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if (ctx->video_fd >= 0) {
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// TODO: Flush and wait on all pending requests
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// Stop output queue
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if (ioctl(ctx->video_fd, VIDIOC_STREAMOFF, &ctx->output_type) < 0) {
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av_log(ctx, AV_LOG_WARNING, "Failed to stop output streaming: %s (%d)\n",
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strerror(errno), errno);
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}
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// Stop capture queue
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if (ioctl(ctx->video_fd, VIDIOC_STREAMOFF, &ctx->format.type) < 0) {
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av_log(ctx, AV_LOG_WARNING, "Failed to stop capture streaming: %s (%d)\n",
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strerror(errno), errno);
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}
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// Release output buffers
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for (int i = 0; i < FF_ARRAY_ELEMS(ctx->output); i++) {
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v4l2_request_buffer_free(&ctx->output[i]);
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}
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// Close video device file descriptor
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close(ctx->video_fd);
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ctx->video_fd = -1;
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}
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// Ownership of media device file descriptor may belong to hwdevice
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if (ctx->device_ref) {
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av_buffer_unref(&ctx->device_ref);
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ctx->media_fd = -1;
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} else if (ctx->media_fd >= 0) {
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close(ctx->media_fd);
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ctx->media_fd = -1;
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}
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ff_mutex_destroy(&ctx->mutex);
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return 0;
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}
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static int v4l2_request_init_context(AVCodecContext *avctx)
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{
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V4L2RequestContext *ctx = v4l2_request_context(avctx);
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int ret;
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// Initialize context state
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ff_mutex_init(&ctx->mutex, NULL);
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for (int i = 0; i < FF_ARRAY_ELEMS(ctx->output); i++) {
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ctx->output[i].index = i;
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ctx->output[i].fd = -1;
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}
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atomic_init(&ctx->next_output, 0);
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atomic_init(&ctx->queued_output, 0);
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atomic_init(&ctx->queued_request, 0);
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atomic_init(&ctx->queued_capture, 0);
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// Get format details for capture buffers
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if (ioctl(ctx->video_fd, VIDIOC_G_FMT, &ctx->format) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Failed to get capture format: %s (%d)\n",
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strerror(errno), errno);
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ret = AVERROR(errno);
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goto fail;
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}
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// Create frame context and allocate initial capture buffers
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ret = ff_decode_get_hw_frames_ctx(avctx, AV_HWDEVICE_TYPE_V4L2REQUEST);
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if (ret < 0)
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goto fail;
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// Allocate output buffers for circular queue
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for (int i = 0; i < FF_ARRAY_ELEMS(ctx->output); i++) {
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ret = v4l2_request_buffer_alloc(ctx, &ctx->output[i], ctx->output_type);
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if (ret < 0)
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goto fail;
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}
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// Allocate requests for circular queue
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for (int i = 0; i < FF_ARRAY_ELEMS(ctx->output); i++) {
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if (ioctl(ctx->media_fd, MEDIA_IOC_REQUEST_ALLOC, &ctx->output[i].fd) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Failed to allocate request %d: %s (%d)\n",
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i, strerror(errno), errno);
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ret = AVERROR(errno);
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goto fail;
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}
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}
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// Start output queue
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if (ioctl(ctx->video_fd, VIDIOC_STREAMON, &ctx->output_type) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Failed to start output streaming: %s (%d)\n",
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strerror(errno), errno);
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ret = AVERROR(errno);
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goto fail;
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}
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// Start capture queue
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if (ioctl(ctx->video_fd, VIDIOC_STREAMON, &ctx->format.type) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Failed to start capture streaming: %s (%d)\n",
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strerror(errno), errno);
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ret = AVERROR(errno);
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goto fail;
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}
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return 0;
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fail:
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ff_v4l2_request_uninit(avctx);
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return ret;
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}
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int ff_v4l2_request_init(AVCodecContext *avctx,
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uint32_t pixelformat, uint32_t buffersize,
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struct v4l2_ext_control *control, int count)
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{
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V4L2RequestContext *ctx = v4l2_request_context(avctx);
|
||||
AVV4L2RequestDeviceContext *hwctx = NULL;
|
||||
|
||||
// Set initial default values
|
||||
ctx->av_class = &v4l2_request_context_class;
|
||||
ctx->media_fd = -1;
|
||||
ctx->video_fd = -1;
|
||||
|
||||
// Try to use media device file descriptor opened and owned by hwdevice
|
||||
if (avctx->hw_device_ctx) {
|
||||
AVHWDeviceContext *device_ctx = (AVHWDeviceContext *)avctx->hw_device_ctx->data;
|
||||
if (device_ctx->type == AV_HWDEVICE_TYPE_V4L2REQUEST && device_ctx->hwctx) {
|
||||
hwctx = device_ctx->hwctx;
|
||||
ctx->media_fd = hwctx->media_fd;
|
||||
}
|
||||
}
|
||||
|
||||
// TODO: Probe for a capable media and video device
|
||||
|
||||
// Transfer (or return) ownership of media device file descriptor to hwdevice
|
||||
if (hwctx) {
|
||||
hwctx->media_fd = ctx->media_fd;
|
||||
ctx->device_ref = av_buffer_ref(avctx->hw_device_ctx);
|
||||
}
|
||||
|
||||
// Create buffers and finalize init
|
||||
return v4l2_request_init_context(avctx);
|
||||
}
|
||||
84
libavcodec/v4l2_request.h
Normal file
84
libavcodec/v4l2_request.h
Normal file
|
|
@ -0,0 +1,84 @@
|
|||
/*
|
||||
* 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 <stdatomic.h>
|
||||
#include <stdbool.h>
|
||||
|
||||
#include <linux/videodev2.h>
|
||||
|
||||
#include "libavutil/hwcontext_drm.h"
|
||||
#include "libavutil/thread.h"
|
||||
|
||||
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 V4L2RequestContext {
|
||||
const AVClass *av_class;
|
||||
AVBufferRef *device_ref;
|
||||
int media_fd;
|
||||
int video_fd;
|
||||
struct v4l2_format format;
|
||||
enum v4l2_buf_type output_type;
|
||||
AVMutex mutex;
|
||||
V4L2RequestBuffer output[4];
|
||||
atomic_int_least8_t next_output;
|
||||
atomic_uint_least32_t queued_output;
|
||||
atomic_uint_least32_t queued_request;
|
||||
atomic_uint_least64_t queued_capture;
|
||||
int (*post_probe)(AVCodecContext *avctx);
|
||||
} V4L2RequestContext;
|
||||
|
||||
typedef struct V4L2RequestPictureContext {
|
||||
V4L2RequestBuffer *output;
|
||||
V4L2RequestBuffer *capture;
|
||||
} V4L2RequestPictureContext;
|
||||
|
||||
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_set_request_controls(V4L2RequestContext *ctx, int request_fd,
|
||||
struct v4l2_ext_control *control, int count);
|
||||
|
||||
int ff_v4l2_request_set_controls(AVCodecContext *avctx,
|
||||
struct v4l2_ext_control *control, int count);
|
||||
|
||||
int ff_v4l2_request_frame_params(AVCodecContext *avctx,
|
||||
AVBufferRef *hw_frames_ctx);
|
||||
|
||||
int ff_v4l2_request_uninit(AVCodecContext *avctx);
|
||||
|
||||
int ff_v4l2_request_init(AVCodecContext *avctx,
|
||||
uint32_t pixelformat, uint32_t buffersize,
|
||||
struct v4l2_ext_control *control, int count);
|
||||
|
||||
#endif /* AVCODEC_V4L2_REQUEST_H */
|
||||
42
libavcodec/v4l2_request_internal.h
Normal file
42
libavcodec/v4l2_request_internal.h
Normal file
|
|
@ -0,0 +1,42 @@
|
|||
/*
|
||||
* 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_INTERNAL_H
|
||||
#define AVCODEC_V4L2_REQUEST_INTERNAL_H
|
||||
|
||||
#include <linux/media.h>
|
||||
|
||||
#include "internal.h"
|
||||
#include "v4l2_request.h"
|
||||
|
||||
typedef struct V4L2RequestFrameDescriptor {
|
||||
AVDRMFrameDescriptor base;
|
||||
V4L2RequestBuffer capture;
|
||||
} V4L2RequestFrameDescriptor;
|
||||
|
||||
static inline V4L2RequestContext *v4l2_request_context(AVCodecContext *avctx)
|
||||
{
|
||||
return (V4L2RequestContext *)avctx->internal->hwaccel_priv_data;
|
||||
}
|
||||
|
||||
static inline V4L2RequestFrameDescriptor *v4l2_request_framedesc(AVFrame *frame)
|
||||
{
|
||||
return (V4L2RequestFrameDescriptor *)frame->data[0];
|
||||
}
|
||||
|
||||
#endif /* AVCODEC_V4L2_REQUEST_INTERNAL_H */
|
||||
Loading…
Add table
Add a link
Reference in a new issue