mirror of https://git.ffmpeg.org/ffmpeg.git
668 lines
18 KiB
C
668 lines
18 KiB
C
/*
|
|
* 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 AVCodecContext *logger(V4L2Context *ctx)
|
|
{
|
|
return ctx_to_m2mctx(ctx)->avctx;
|
|
}
|
|
|
|
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 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 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;
|
|
} 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;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* returns 1 if reinit was succesful, 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);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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) {
|
|
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,
|
|
};
|
|
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);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int v4l2_stop_encode(V4L2Context *ctx)
|
|
{
|
|
struct v4l2_encoder_cmd cmd = {
|
|
.cmd = V4L2_ENC_CMD_STOP,
|
|
};
|
|
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);
|
|
}
|
|
|
|
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 ret;
|
|
|
|
if (V4L2_TYPE_IS_OUTPUT(ctx->type))
|
|
pfd.events = POLLOUT | POLLWRNORM;
|
|
|
|
for (;;) {
|
|
ret = poll(&pfd, 1, timeout);
|
|
if (ret > 0)
|
|
break;
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
/* timeout is being used to indicate last valid bufer when draining */
|
|
if (ctx_to_m2mctx(ctx)->draining)
|
|
ctx->done = 1;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* 0. handle errors */
|
|
if (pfd.revents & POLLERR) {
|
|
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 = EINVAL;
|
|
return NULL;
|
|
}
|
|
if (ret) {
|
|
/* if re-init was successfull 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 = errno;
|
|
if (errno != EPIPE)
|
|
av_log(logger(ctx), AV_LOG_DEBUG, "%s VIDIOC_DQBUF, errno (%s)\n",
|
|
ctx->name, av_err2str(AVERROR(errno)));
|
|
}
|
|
} else {
|
|
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;
|
|
}
|
|
|
|
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)
|
|
pixfmt = AV_PIX_FMT_NONE;
|
|
else
|
|
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, int 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(ENOMEM);
|
|
|
|
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)
|
|
{
|
|
V4L2Buffer* avbuf = NULL;
|
|
|
|
/* if we are draining, we are no longer inputing data, therefore enable a
|
|
* timeout so we can dequeue and flag the last valid buffer.
|
|
*
|
|
* blocks until:
|
|
* 1. decoded frame available
|
|
* 2. an input buffer is ready to be dequeued
|
|
*/
|
|
avbuf = v4l2_dequeue_v4l2buf(ctx, ctx_to_m2mctx(ctx)->draining ? 200 : -1);
|
|
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;
|
|
|
|
/* if we are draining, we are no longer inputing data, therefore enable a
|
|
* timeout so we can dequeue and flag the last valid buffer.
|
|
*
|
|
* blocks until:
|
|
* 1. encoded packet available
|
|
* 2. an input buffer ready to be dequeued
|
|
*/
|
|
avbuf = v4l2_dequeue_v4l2buf(ctx, ctx_to_m2mctx(ctx)->draining ? 200 : -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)
|
|
{
|
|
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 = 1;
|
|
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)
|
|
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 initialization (%s)\n", ctx->name, av_err2str(ret));
|
|
av_free(ctx->buffers);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|