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ffmpeg/libavcodec/v4l2_context.c

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/*
* V4L2 context helper functions.
*
* Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
* Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
*
* 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 <linux/videodev2.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <poll.h>
#include "libavcodec/avcodec.h"
#include "libavcodec/internal.h"
#include "v4l2_buffers.h"
#include "v4l2_fmt.h"
#include "v4l2_m2m.h"
struct v4l2_format_update {
uint32_t v4l2_fmt;
int update_v4l2;
enum AVPixelFormat av_fmt;
int update_avfmt;
};
static inline V4L2m2mContext *ctx_to_m2mctx(V4L2Context *ctx)
{
return V4L2_TYPE_IS_OUTPUT(ctx->type) ?
container_of(ctx, V4L2m2mContext, output) :
container_of(ctx, V4L2m2mContext, capture);
}
static inline AVClass *logger(V4L2Context *ctx)
{
return ctx_to_m2mctx(ctx)->priv;
}
static inline unsigned int v4l2_get_width(struct v4l2_format *fmt)
{
return V4L2_TYPE_IS_MULTIPLANAR(fmt->type) ? fmt->fmt.pix_mp.width : fmt->fmt.pix.width;
}
static inline unsigned int v4l2_get_height(struct v4l2_format *fmt)
{
return V4L2_TYPE_IS_MULTIPLANAR(fmt->type) ? fmt->fmt.pix_mp.height : fmt->fmt.pix.height;
}
static AVRational v4l2_get_sar(V4L2Context *ctx)
{
struct AVRational sar = { 0, 1 };
struct v4l2_cropcap cropcap;
int ret;
memset(&cropcap, 0, sizeof(cropcap));
cropcap.type = ctx->type;
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_CROPCAP, &cropcap);
if (ret)
return sar;
sar.num = cropcap.pixelaspect.numerator;
sar.den = cropcap.pixelaspect.denominator;
return sar;
}
static inline unsigned int v4l2_resolution_changed(V4L2Context *ctx, struct v4l2_format *fmt2)
{
struct v4l2_format *fmt1 = &ctx->format;
int ret = V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ?
fmt1->fmt.pix_mp.width != fmt2->fmt.pix_mp.width ||
fmt1->fmt.pix_mp.height != fmt2->fmt.pix_mp.height
:
fmt1->fmt.pix.width != fmt2->fmt.pix.width ||
fmt1->fmt.pix.height != fmt2->fmt.pix.height;
if (ret)
av_log(logger(ctx), AV_LOG_DEBUG, "%s changed (%dx%d) -> (%dx%d)\n",
ctx->name,
v4l2_get_width(fmt1), v4l2_get_height(fmt1),
v4l2_get_width(fmt2), v4l2_get_height(fmt2));
return ret;
}
static inline int v4l2_type_supported(V4L2Context *ctx)
{
return ctx->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE ||
ctx->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE ||
ctx->type == V4L2_BUF_TYPE_VIDEO_CAPTURE ||
ctx->type == V4L2_BUF_TYPE_VIDEO_OUTPUT;
}
static inline int v4l2_get_framesize_compressed(V4L2Context* ctx, int width, int height)
{
V4L2m2mContext *s = ctx_to_m2mctx(ctx);
const int SZ_4K = 0x1000;
int size;
if (s->avctx && av_codec_is_decoder(s->avctx->codec))
return ((width * height * 3 / 2) / 2) + 128;
/* encoder */
size = FFALIGN(height, 32) * FFALIGN(width, 32) * 3 / 2 / 2;
return FFALIGN(size, SZ_4K);
}
static inline void v4l2_save_to_context(V4L2Context* ctx, struct v4l2_format_update *fmt)
{
ctx->format.type = ctx->type;
if (fmt->update_avfmt)
ctx->av_pix_fmt = fmt->av_fmt;
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
/* update the sizes to handle the reconfiguration of the capture stream at runtime */
ctx->format.fmt.pix_mp.height = ctx->height;
ctx->format.fmt.pix_mp.width = ctx->width;
if (fmt->update_v4l2) {
ctx->format.fmt.pix_mp.pixelformat = fmt->v4l2_fmt;
/* s5p-mfc requires the user to specify a buffer size */
ctx->format.fmt.pix_mp.plane_fmt[0].sizeimage =
v4l2_get_framesize_compressed(ctx, ctx->width, ctx->height);
}
} else {
ctx->format.fmt.pix.height = ctx->height;
ctx->format.fmt.pix.width = ctx->width;
if (fmt->update_v4l2) {
ctx->format.fmt.pix.pixelformat = fmt->v4l2_fmt;
/* s5p-mfc requires the user to specify a buffer size */
ctx->format.fmt.pix.sizeimage =
v4l2_get_framesize_compressed(ctx, ctx->width, ctx->height);
}
}
}
/**
* returns 1 if reinit was successful, negative if it failed
* returns 0 if reinit was not executed
*/
static int v4l2_handle_event(V4L2Context *ctx)
{
V4L2m2mContext *s = ctx_to_m2mctx(ctx);
struct v4l2_format cap_fmt = s->capture.format;
struct v4l2_format out_fmt = s->output.format;
struct v4l2_event evt = { 0 };
int full_reinit, reinit, ret;
ret = ioctl(s->fd, VIDIOC_DQEVENT, &evt);
if (ret < 0) {
av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_DQEVENT\n", ctx->name);
return 0;
}
if (evt.type != V4L2_EVENT_SOURCE_CHANGE)
return 0;
ret = ioctl(s->fd, VIDIOC_G_FMT, &out_fmt);
if (ret) {
av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_G_FMT\n", s->output.name);
return 0;
}
ret = ioctl(s->fd, VIDIOC_G_FMT, &cap_fmt);
if (ret) {
av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_G_FMT\n", s->capture.name);
return 0;
}
full_reinit = v4l2_resolution_changed(&s->output, &out_fmt);
if (full_reinit) {
s->output.height = v4l2_get_height(&out_fmt);
s->output.width = v4l2_get_width(&out_fmt);
s->output.sample_aspect_ratio = v4l2_get_sar(&s->output);
}
reinit = v4l2_resolution_changed(&s->capture, &cap_fmt);
if (reinit) {
s->capture.height = v4l2_get_height(&cap_fmt);
s->capture.width = v4l2_get_width(&cap_fmt);
s->capture.sample_aspect_ratio = v4l2_get_sar(&s->capture);
}
if (full_reinit || reinit)
s->reinit = 1;
if (full_reinit) {
ret = ff_v4l2_m2m_codec_full_reinit(s);
if (ret) {
av_log(logger(ctx), AV_LOG_ERROR, "v4l2_m2m_codec_full_reinit\n");
return -EINVAL;
}
goto reinit_run;
}
if (reinit) {
if (s->avctx)
ret = ff_set_dimensions(s->avctx, s->capture.width, s->capture.height);
if (ret < 0)
av_log(logger(ctx), AV_LOG_WARNING, "update avcodec height and width\n");
ret = ff_v4l2_m2m_codec_reinit(s);
if (ret) {
av_log(logger(ctx), AV_LOG_ERROR, "v4l2_m2m_codec_reinit\n");
return -EINVAL;
}
goto reinit_run;
}
/* dummy event received */
return 0;
/* reinit executed */
reinit_run:
return 1;
}
static int v4l2_stop_decode(V4L2Context *ctx)
{
struct v4l2_decoder_cmd cmd = {
.cmd = V4L2_DEC_CMD_STOP,
.flags = 0,
};
int ret;
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_DECODER_CMD, &cmd);
if (ret) {
/* DECODER_CMD is optional */
if (errno == ENOTTY)
return ff_v4l2_context_set_status(ctx, VIDIOC_STREAMOFF);
else
return AVERROR(errno);
}
return 0;
}
static int v4l2_stop_encode(V4L2Context *ctx)
{
struct v4l2_encoder_cmd cmd = {
.cmd = V4L2_ENC_CMD_STOP,
.flags = 0,
};
int ret;
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_ENCODER_CMD, &cmd);
if (ret) {
/* ENCODER_CMD is optional */
if (errno == ENOTTY)
return ff_v4l2_context_set_status(ctx, VIDIOC_STREAMOFF);
else
return AVERROR(errno);
}
return 0;
}
static V4L2Buffer* v4l2_dequeue_v4l2buf(V4L2Context *ctx, int timeout)
{
struct v4l2_plane planes[VIDEO_MAX_PLANES];
struct v4l2_buffer buf = { 0 };
V4L2Buffer* avbuf = NULL;
struct pollfd pfd = {
.events = POLLIN | POLLRDNORM | POLLPRI | POLLOUT | POLLWRNORM, /* default blocking capture */
.fd = ctx_to_m2mctx(ctx)->fd,
};
int i, ret;
/* if we are draining and there are no more capture buffers queued in the driver we are done */
if (!V4L2_TYPE_IS_OUTPUT(ctx->type) && ctx_to_m2mctx(ctx)->draining) {
for (i = 0; i < ctx->num_buffers; i++) {
/* capture buffer initialization happens during decode hence
* detection happens at runtime
*/
if (!ctx->buffers)
break;
if (ctx->buffers[i].status == V4L2BUF_IN_DRIVER)
goto start;
}
ctx->done = 1;
return NULL;
}
start:
if (V4L2_TYPE_IS_OUTPUT(ctx->type))
pfd.events = POLLOUT | POLLWRNORM;
else {
/* no need to listen to requests for more input while draining */
if (ctx_to_m2mctx(ctx)->draining)
pfd.events = POLLIN | POLLRDNORM | POLLPRI;
}
for (;;) {
ret = poll(&pfd, 1, timeout);
if (ret > 0)
break;
if (errno == EINTR)
continue;
return NULL;
}
/* 0. handle errors */
if (pfd.revents & POLLERR) {
/* if we are trying to get free buffers but none have been queued yet
no need to raise a warning */
if (timeout == 0) {
for (i = 0; i < ctx->num_buffers; i++) {
if (ctx->buffers[i].status != V4L2BUF_AVAILABLE)
av_log(logger(ctx), AV_LOG_WARNING, "%s POLLERR\n", ctx->name);
}
}
else
av_log(logger(ctx), AV_LOG_WARNING, "%s POLLERR\n", ctx->name);
return NULL;
}
/* 1. handle resolution changes */
if (pfd.revents & POLLPRI) {
ret = v4l2_handle_event(ctx);
if (ret < 0) {
/* if re-init failed, abort */
ctx->done = 1;
return NULL;
}
if (ret) {
/* if re-init was successful drop the buffer (if there was one)
* since we had to reconfigure capture (unmap all buffers)
*/
return NULL;
}
}
/* 2. dequeue the buffer */
if (pfd.revents & (POLLIN | POLLRDNORM | POLLOUT | POLLWRNORM)) {
if (!V4L2_TYPE_IS_OUTPUT(ctx->type)) {
/* there is a capture buffer ready */
if (pfd.revents & (POLLIN | POLLRDNORM))
goto dequeue;
/* the driver is ready to accept more input; instead of waiting for the capture
* buffer to complete we return NULL so input can proceed (we are single threaded)
*/
if (pfd.revents & (POLLOUT | POLLWRNORM))
return NULL;
}
dequeue:
memset(&buf, 0, sizeof(buf));
buf.memory = V4L2_MEMORY_MMAP;
buf.type = ctx->type;
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
memset(planes, 0, sizeof(planes));
buf.length = VIDEO_MAX_PLANES;
buf.m.planes = planes;
}
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_DQBUF, &buf);
if (ret) {
if (errno != EAGAIN) {
ctx->done = 1;
if (errno != EPIPE)
av_log(logger(ctx), AV_LOG_DEBUG, "%s VIDIOC_DQBUF, errno (%s)\n",
ctx->name, av_err2str(AVERROR(errno)));
}
return NULL;
}
avbuf = &ctx->buffers[buf.index];
avbuf->status = V4L2BUF_AVAILABLE;
avbuf->buf = buf;
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type)) {
memcpy(avbuf->planes, planes, sizeof(planes));
avbuf->buf.m.planes = avbuf->planes;
}
return avbuf;
}
return NULL;
}
static V4L2Buffer* v4l2_getfree_v4l2buf(V4L2Context *ctx)
{
int timeout = 0; /* return when no more buffers to dequeue */
int i;
/* get back as many output buffers as possible */
if (V4L2_TYPE_IS_OUTPUT(ctx->type)) {
do {
} while (v4l2_dequeue_v4l2buf(ctx, timeout));
}
for (i = 0; i < ctx->num_buffers; i++) {
if (ctx->buffers[i].status == V4L2BUF_AVAILABLE)
return &ctx->buffers[i];
}
return NULL;
}
static int v4l2_release_buffers(V4L2Context* ctx)
{
struct v4l2_requestbuffers req = {
.memory = V4L2_MEMORY_MMAP,
.type = ctx->type,
.count = 0, /* 0 -> unmaps buffers from the driver */
};
int i, j;
for (i = 0; i < ctx->num_buffers; i++) {
V4L2Buffer *buffer = &ctx->buffers[i];
for (j = 0; j < buffer->num_planes; j++) {
struct V4L2Plane_info *p = &buffer->plane_info[j];
if (p->mm_addr && p->length)
if (munmap(p->mm_addr, p->length) < 0)
av_log(logger(ctx), AV_LOG_ERROR, "%s unmap plane (%s))\n", ctx->name, av_err2str(AVERROR(errno)));
}
}
return ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_REQBUFS, &req);
}
static inline int v4l2_try_raw_format(V4L2Context* ctx, enum AVPixelFormat pixfmt)
{
struct v4l2_format *fmt = &ctx->format;
uint32_t v4l2_fmt;
int ret;
v4l2_fmt = ff_v4l2_format_avfmt_to_v4l2(pixfmt);
if (!v4l2_fmt)
return AVERROR(EINVAL);
if (V4L2_TYPE_IS_MULTIPLANAR(ctx->type))
fmt->fmt.pix_mp.pixelformat = v4l2_fmt;
else
fmt->fmt.pix.pixelformat = v4l2_fmt;
fmt->type = ctx->type;
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_TRY_FMT, fmt);
if (ret)
return AVERROR(EINVAL);
return 0;
}
static int v4l2_get_raw_format(V4L2Context* ctx, enum AVPixelFormat *p)
{
enum AVPixelFormat pixfmt = ctx->av_pix_fmt;
struct v4l2_fmtdesc fdesc;
int ret;
memset(&fdesc, 0, sizeof(fdesc));
fdesc.type = ctx->type;
if (pixfmt != AV_PIX_FMT_NONE) {
ret = v4l2_try_raw_format(ctx, pixfmt);
if (!ret)
return 0;
}
for (;;) {
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_ENUM_FMT, &fdesc);
if (ret)
return AVERROR(EINVAL);
pixfmt = ff_v4l2_format_v4l2_to_avfmt(fdesc.pixelformat, AV_CODEC_ID_RAWVIDEO);
ret = v4l2_try_raw_format(ctx, pixfmt);
if (ret){
fdesc.index++;
continue;
}
*p = pixfmt;
return 0;
}
return AVERROR(EINVAL);
}
static int v4l2_get_coded_format(V4L2Context* ctx, uint32_t *p)
{
struct v4l2_fmtdesc fdesc;
uint32_t v4l2_fmt;
int ret;
/* translate to a valid v4l2 format */
v4l2_fmt = ff_v4l2_format_avcodec_to_v4l2(ctx->av_codec_id);
if (!v4l2_fmt)
return AVERROR(EINVAL);
/* check if the driver supports this format */
memset(&fdesc, 0, sizeof(fdesc));
fdesc.type = ctx->type;
for (;;) {
ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_ENUM_FMT, &fdesc);
if (ret)
return AVERROR(EINVAL);
if (fdesc.pixelformat == v4l2_fmt)
break;
fdesc.index++;
}
*p = v4l2_fmt;
return 0;
}
/*****************************************************************************
*
* V4L2 Context Interface
*
*****************************************************************************/
int ff_v4l2_context_set_status(V4L2Context* ctx, uint32_t cmd)
{
int type = ctx->type;
int ret;
ret = ioctl(ctx_to_m2mctx(ctx)->fd, cmd, &type);
if (ret < 0)
return AVERROR(errno);
ctx->streamon = (cmd == VIDIOC_STREAMON);
return 0;
}
int ff_v4l2_context_enqueue_frame(V4L2Context* ctx, const AVFrame* frame)
{
V4L2m2mContext *s = ctx_to_m2mctx(ctx);
V4L2Buffer* avbuf;
int ret;
if (!frame) {
ret = v4l2_stop_encode(ctx);
if (ret)
av_log(logger(ctx), AV_LOG_ERROR, "%s stop_encode\n", ctx->name);
s->draining= 1;
return 0;
}
avbuf = v4l2_getfree_v4l2buf(ctx);
if (!avbuf)
return AVERROR(ENOMEM);
ret = ff_v4l2_buffer_avframe_to_buf(frame, avbuf);
if (ret)
return ret;
return ff_v4l2_buffer_enqueue(avbuf);
}
int ff_v4l2_context_enqueue_packet(V4L2Context* ctx, const AVPacket* pkt)
{
V4L2m2mContext *s = ctx_to_m2mctx(ctx);
V4L2Buffer* avbuf;
int ret;
if (!pkt->size) {
ret = v4l2_stop_decode(ctx);
if (ret)
av_log(logger(ctx), AV_LOG_ERROR, "%s stop_decode\n", ctx->name);
s->draining = 1;
return 0;
}
avbuf = v4l2_getfree_v4l2buf(ctx);
if (!avbuf)
return AVERROR(EAGAIN);
ret = ff_v4l2_buffer_avpkt_to_buf(pkt, avbuf);
if (ret)
return ret;
return ff_v4l2_buffer_enqueue(avbuf);
}
int ff_v4l2_context_dequeue_frame(V4L2Context* ctx, AVFrame* frame, int timeout)
{
V4L2Buffer* avbuf = NULL;
/*
* timeout=-1 blocks until:
* 1. decoded frame available
* 2. an input buffer is ready to be dequeued
*/
avbuf = v4l2_dequeue_v4l2buf(ctx, timeout);
if (!avbuf) {
if (ctx->done)
return AVERROR_EOF;
return AVERROR(EAGAIN);
}
return ff_v4l2_buffer_buf_to_avframe(frame, avbuf);
}
int ff_v4l2_context_dequeue_packet(V4L2Context* ctx, AVPacket* pkt)
{
V4L2Buffer* avbuf = NULL;
/*
* blocks until:
* 1. encoded packet available
* 2. an input buffer ready to be dequeued
*/
avbuf = v4l2_dequeue_v4l2buf(ctx, -1);
if (!avbuf) {
if (ctx->done)
return AVERROR_EOF;
return AVERROR(EAGAIN);
}
return ff_v4l2_buffer_buf_to_avpkt(pkt, avbuf);
}
int ff_v4l2_context_get_format(V4L2Context* ctx, int probe)
{
struct v4l2_format_update fmt = { 0 };
int ret;
if (ctx->av_codec_id == AV_CODEC_ID_RAWVIDEO) {
ret = v4l2_get_raw_format(ctx, &fmt.av_fmt);
if (ret)
return ret;
fmt.update_avfmt = !probe;
v4l2_save_to_context(ctx, &fmt);
/* format has been tried already */
return ret;
}
ret = v4l2_get_coded_format(ctx, &fmt.v4l2_fmt);
if (ret)
return ret;
fmt.update_v4l2 = 1;
v4l2_save_to_context(ctx, &fmt);
return ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_TRY_FMT, &ctx->format);
}
int ff_v4l2_context_set_format(V4L2Context* ctx)
{
return ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_S_FMT, &ctx->format);
}
void ff_v4l2_context_release(V4L2Context* ctx)
{
int ret;
if (!ctx->buffers)
return;
ret = v4l2_release_buffers(ctx);
if (ret)
av_log(logger(ctx), AV_LOG_WARNING, "V4L2 failed to unmap the %s buffers\n", ctx->name);
av_free(ctx->buffers);
ctx->buffers = NULL;
}
int ff_v4l2_context_init(V4L2Context* ctx)
{
V4L2m2mContext *s = ctx_to_m2mctx(ctx);
struct v4l2_requestbuffers req;
int ret, i;
if (!v4l2_type_supported(ctx)) {
av_log(logger(ctx), AV_LOG_ERROR, "type %i not supported\n", ctx->type);
return AVERROR_PATCHWELCOME;
}
ret = ioctl(s->fd, VIDIOC_G_FMT, &ctx->format);
if (ret)
av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_G_FMT failed\n", ctx->name);
memset(&req, 0, sizeof(req));
req.count = ctx->num_buffers;
req.memory = V4L2_MEMORY_MMAP;
req.type = ctx->type;
ret = ioctl(s->fd, VIDIOC_REQBUFS, &req);
if (ret < 0) {
av_log(logger(ctx), AV_LOG_ERROR, "%s VIDIOC_REQBUFS failed: %s\n", ctx->name, strerror(errno));
return AVERROR(errno);
}
ctx->num_buffers = req.count;
ctx->buffers = av_mallocz(ctx->num_buffers * sizeof(V4L2Buffer));
if (!ctx->buffers) {
av_log(logger(ctx), AV_LOG_ERROR, "%s malloc enomem\n", ctx->name);
return AVERROR(ENOMEM);
}
for (i = 0; i < req.count; i++) {
ctx->buffers[i].context = ctx;
ret = ff_v4l2_buffer_initialize(&ctx->buffers[i], i);
if (ret < 0) {
av_log(logger(ctx), AV_LOG_ERROR, "%s buffer[%d] initialization (%s)\n", ctx->name, i, av_err2str(ret));
goto error;
}
}
av_log(logger(ctx), AV_LOG_DEBUG, "%s: %s %02d buffers initialized: %04ux%04u, sizeimage %08u, bytesperline %08u\n", ctx->name,
V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? av_fourcc2str(ctx->format.fmt.pix_mp.pixelformat) : av_fourcc2str(ctx->format.fmt.pix.pixelformat),
req.count,
v4l2_get_width(&ctx->format),
v4l2_get_height(&ctx->format),
V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? ctx->format.fmt.pix_mp.plane_fmt[0].sizeimage : ctx->format.fmt.pix.sizeimage,
V4L2_TYPE_IS_MULTIPLANAR(ctx->type) ? ctx->format.fmt.pix_mp.plane_fmt[0].bytesperline : ctx->format.fmt.pix.bytesperline);
return 0;
error:
v4l2_release_buffers(ctx);
av_free(ctx->buffers);
ctx->buffers = NULL;
return ret;
}
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