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idroqenc.c
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1 /*
2  * id RoQ (.roq) File muxer
3  * Copyright (c) 2007 Vitor Sessak
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 #include "avformat.h"
23 #include "rawenc.h"
24 
25 
26 static int roq_write_header(struct AVFormatContext *s)
27 {
28  uint8_t header[] = {
29  0x84, 0x10, 0xFF, 0xFF, 0xFF, 0xFF, /* fps: */ 0x1E, 0x00
30  };
31  int n;
32  AVCodecContext *avctx;
33 
34 // set the actual fps
35  for(n=0;n<s->nb_streams;n++) {
36  if ((avctx=s->streams[n]->codec)->codec_type == AVMEDIA_TYPE_VIDEO) {
37  unsigned int fps;
38 
39  if (avctx->time_base.num != 1) {
40  av_log(avctx, AV_LOG_ERROR, "Frame rate must be integer\n");
41  return AVERROR(EINVAL);
42  }
43 
44  if ((fps=avctx->time_base.den) > 255) {
45  av_log(avctx, AV_LOG_ERROR, "Frame rate may not exceed 255fps\n");
46  return AVERROR(EINVAL);
47  }
48 
49  if (fps != 30) {
50  av_log(avctx, AV_LOG_WARNING, "For vintage compatibility fps must be 30\n");
51  }
52 
53  header[6] = fps;
54  break;
55  }
56  }
57 
58  avio_write(s->pb, header, 8);
59  avio_flush(s->pb);
60 
61  return 0;
62 }
63 
65  .name = "roq",
66  .long_name = NULL_IF_CONFIG_SMALL("raw id RoQ"),
67  .extensions = "roq",
68  .audio_codec = AV_CODEC_ID_ROQ_DPCM,
69  .video_codec = AV_CODEC_ID_ROQ,
70  .write_header = roq_write_header,
71  .write_packet = ff_raw_write_packet,
72 };