mirror of
https://github.com/FFmpeg/FFmpeg.git
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120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
/*
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* Copyright (c) 2013 Clément Bœsch
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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 "v4l2-common.h"
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#include "avdevice.h"
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typedef struct {
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AVClass *class;
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int fd;
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} V4L2Context;
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static av_cold int write_header(AVFormatContext *s1)
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{
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int res = 0, flags = O_RDWR;
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struct v4l2_format fmt = {
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.type = V4L2_BUF_TYPE_VIDEO_OUTPUT
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};
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V4L2Context *s = s1->priv_data;
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AVCodecParameters *par;
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uint32_t v4l2_pixfmt;
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if (s1->flags & AVFMT_FLAG_NONBLOCK)
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flags |= O_NONBLOCK;
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s->fd = open(s1->url, flags);
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if (s->fd < 0) {
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res = AVERROR(errno);
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av_log(s1, AV_LOG_ERROR, "Unable to open V4L2 device '%s'\n", s1->url);
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return res;
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}
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if (s1->nb_streams != 1 ||
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s1->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO ||
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s1->streams[0]->codecpar->codec_id != AV_CODEC_ID_RAWVIDEO) {
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av_log(s1, AV_LOG_ERROR,
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"V4L2 output device supports only a single raw video stream\n");
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return AVERROR(EINVAL);
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}
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par = s1->streams[0]->codecpar;
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v4l2_pixfmt = ff_fmt_ff2v4l(par->format, AV_CODEC_ID_RAWVIDEO);
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if (!v4l2_pixfmt) { // XXX: try to force them one by one?
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av_log(s1, AV_LOG_ERROR, "Unknown V4L2 pixel format equivalent for %s\n",
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av_get_pix_fmt_name(par->format));
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return AVERROR(EINVAL);
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}
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if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
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res = AVERROR(errno);
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av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res));
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return res;
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}
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fmt.fmt.pix.width = par->width;
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fmt.fmt.pix.height = par->height;
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fmt.fmt.pix.pixelformat = v4l2_pixfmt;
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fmt.fmt.pix.sizeimage = av_image_get_buffer_size(par->format, par->width, par->height, 1);
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if (ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0) {
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res = AVERROR(errno);
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av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_FMT): %s\n", av_err2str(res));
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return res;
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}
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return res;
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}
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static int write_packet(AVFormatContext *s1, AVPacket *pkt)
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{
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const V4L2Context *s = s1->priv_data;
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if (write(s->fd, pkt->data, pkt->size) == -1)
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return AVERROR(errno);
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return 0;
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}
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static int write_trailer(AVFormatContext *s1)
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{
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const V4L2Context *s = s1->priv_data;
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close(s->fd);
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return 0;
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}
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static const AVClass v4l2_class = {
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.class_name = "V4L2 outdev",
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.item_name = av_default_item_name,
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.version = LIBAVUTIL_VERSION_INT,
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.category = AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
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};
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AVOutputFormat ff_v4l2_muxer = {
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.name = "v4l2",
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.long_name = NULL_IF_CONFIG_SMALL("Video4Linux2 output device"),
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.priv_data_size = sizeof(V4L2Context),
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.audio_codec = AV_CODEC_ID_NONE,
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.video_codec = AV_CODEC_ID_RAWVIDEO,
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.write_header = write_header,
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.write_packet = write_packet,
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.write_trailer = write_trailer,
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.flags = AVFMT_NOFILE,
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.priv_class = &v4l2_class,
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};
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