Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * Copyright (c) 2013 Clément Bœsch
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include "v4l2-common.h"
  22. #include "avdevice.h"
  23.  
  24. typedef struct {
  25.     int fd;
  26. } V4L2Context;
  27.  
  28. static av_cold int write_header(AVFormatContext *s1)
  29. {
  30.     int res = 0, flags = O_RDWR;
  31.     struct v4l2_format fmt = {
  32.         .type = V4L2_BUF_TYPE_VIDEO_OUTPUT
  33.     };
  34.     V4L2Context *s = s1->priv_data;
  35.     AVCodecContext *enc_ctx;
  36.     uint32_t v4l2_pixfmt;
  37.  
  38.     if (s1->flags & AVFMT_FLAG_NONBLOCK)
  39.         flags |= O_NONBLOCK;
  40.  
  41.     s->fd = open(s1->filename, flags);
  42.     if (s->fd < 0) {
  43.         res = AVERROR(errno);
  44.         av_log(s1, AV_LOG_ERROR, "Unable to open V4L2 device '%s'\n", s1->filename);
  45.         return res;
  46.     }
  47.  
  48.     if (s1->nb_streams != 1 ||
  49.         s1->streams[0]->codec->codec_type != AVMEDIA_TYPE_VIDEO ||
  50.         s1->streams[0]->codec->codec_id   != AV_CODEC_ID_RAWVIDEO) {
  51.         av_log(s1, AV_LOG_ERROR,
  52.                "V4L2 output device supports only a single raw video stream\n");
  53.         return AVERROR(EINVAL);
  54.     }
  55.  
  56.     enc_ctx = s1->streams[0]->codec;
  57.  
  58.     v4l2_pixfmt = avpriv_fmt_ff2v4l(enc_ctx->pix_fmt, AV_CODEC_ID_RAWVIDEO);
  59.     if (!v4l2_pixfmt) { // XXX: try to force them one by one?
  60.         av_log(s1, AV_LOG_ERROR, "Unknown V4L2 pixel format equivalent for %s\n",
  61.                av_get_pix_fmt_name(enc_ctx->pix_fmt));
  62.         return AVERROR(EINVAL);
  63.     }
  64.  
  65.     if (ioctl(s->fd, VIDIOC_G_FMT, &fmt) < 0) {
  66.         res = AVERROR(errno);
  67.         av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_G_FMT): %s\n", av_err2str(res));
  68.         return res;
  69.     }
  70.  
  71.     fmt.fmt.pix.width       = enc_ctx->width;
  72.     fmt.fmt.pix.height      = enc_ctx->height;
  73.     fmt.fmt.pix.pixelformat = v4l2_pixfmt;
  74.     fmt.fmt.pix.sizeimage   = av_image_get_buffer_size(enc_ctx->pix_fmt, enc_ctx->width, enc_ctx->height, 1);
  75.  
  76.     if (ioctl(s->fd, VIDIOC_S_FMT, &fmt) < 0) {
  77.         res = AVERROR(errno);
  78.         av_log(s1, AV_LOG_ERROR, "ioctl(VIDIOC_S_FMT): %s\n", av_err2str(res));
  79.         return res;
  80.     }
  81.  
  82.     return res;
  83. }
  84.  
  85. static int write_packet(AVFormatContext *s1, AVPacket *pkt)
  86. {
  87.     const V4L2Context *s = s1->priv_data;
  88.     if (write(s->fd, pkt->data, pkt->size) == -1)
  89.         return AVERROR(errno);
  90.     return 0;
  91. }
  92.  
  93. static int write_trailer(AVFormatContext *s1)
  94. {
  95.     const V4L2Context *s = s1->priv_data;
  96.     close(s->fd);
  97.     return 0;
  98. }
  99.  
  100. AVOutputFormat ff_v4l2_muxer = {
  101.     .name           = "v4l2",
  102.     .long_name      = NULL_IF_CONFIG_SMALL("Video4Linux2 output device"),
  103.     .priv_data_size = sizeof(V4L2Context),
  104.     .audio_codec    = AV_CODEC_ID_NONE,
  105.     .video_codec    = AV_CODEC_ID_RAWVIDEO,
  106.     .write_header   = write_header,
  107.     .write_packet   = write_packet,
  108.     .write_trailer  = write_trailer,
  109.     .flags          = AVFMT_NOFILE,
  110. };
  111.