111 lines
3.4 KiB
C
111 lines
3.4 KiB
C
/*
|
|
* Copyright (c) 2013 Clément Bœsch
|
|
*
|
|
* 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 "v4l2-common.h"
|
|
#include "avdevice.h"
|
|
|
|
typedef struct {
|
|
int fd;
|
|
} V4L2Context;
|
|
|
|
static av_cold int write_header(AVFormatContext *s1)
|
|
{
|
|
int res = 0, flags = O_RDWR;
|
|
struct v4l2_format fmt = {
|
|
.type = V4L2_BUF_TYPE_VIDEO_OUTPUT
|
|
};
|
|
V4L2Context *s = s1->priv_data;
|
|
AVCodecContext *enc_ctx;
|
|
uint32_t v4l2_pixfmt;
|
|
|
|
if (s1->flags & AVFMT_FLAG_NONBLOCK)
|
|
flags |= O_NONBLOCK;
|
|
|
|
s->fd = open(s1->filename, flags);
|
|
if (s->fd < 0) {
|
|
res = AVERROR(errno);
|
|
av_log(s1, AV_LOG_ERROR, "Unable to open V4L2 device '%s'\n", s1->filename);
|
|
return res;
|
|
}
|
|
|
|
if (s1->nb_streams != 1 ||
|
|
s1->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO ||
|
|
s1->streams[0]->codec->codec_id != AV_CODEC_ID_RAWVIDEO) {
|
|
av_log(s1, AV_LOG_ERROR,
|
|
"V4L2 output device supports only a single raw video stream\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
enc_ctx = s1->streams[0]->codec;
|
|
|
|
v4l2_pixfmt = avpriv_fmt_ff2v4l(enc_ctx->pix_fmt, AV_CODEC_ID_RAWVIDEO);
|
|
if (!v4l2_pixfmt) { // XXX: try to force them one by one?
|
|
av_log(s1, AV_LOG_ERROR, "Unknown V4L2 pixel format equivalent for %s\n",
|
|
av_get_pix_fmt_name(enc_ctx->pix_fmt));
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
|
|
res = AVERROR(errno);
|
|
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res));
|
|
return res;
|
|
}
|
|
|
|
fmt.fmt.pix.width = enc_ctx->width;
|
|
fmt.fmt.pix.height = enc_ctx->height;
|
|
fmt.fmt.pix.pixelformat = v4l2_pixfmt;
|
|
fmt.fmt.pix.sizeimage = av_image_get_buffer_size(enc_ctx->pix_fmt, enc_ctx->width, enc_ctx->height, 1);
|
|
|
|
if (ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0) {
|
|
res = AVERROR(errno);
|
|
av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_FMT): %s\n", av_err2str(res));
|
|
return res;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int write_packet(AVFormatContext *s1, AVPacket *pkt)
|
|
{
|
|
const V4L2Context *s = s1->priv_data;
|
|
if (write(s->fd, pkt->data, pkt->size) == -1)
|
|
return AVERROR(errno);
|
|
return 0;
|
|
}
|
|
|
|
static int write_trailer(AVFormatContext *s1)
|
|
{
|
|
const V4L2Context *s = s1->priv_data;
|
|
close(s->fd);
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat ff_v4l2_muxer = {
|
|
.name = "v4l2",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 output device"),
|
|
.priv_data_size = sizeof(V4L2Context),
|
|
.audio_codec = AV_CODEC_ID_NONE,
|
|
.video_codec = AV_CODEC_ID_RAWVIDEO,
|
|
.write_header = write_header,
|
|
.write_packet = write_packet,
|
|
.write_trailer = write_trailer,
|
|
.flags = AVFMT_NOFILE,
|
|
};
|