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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 };
const char * s
Definition: avisynth_c.h:631
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int num
numerator
Definition: rational.h:44
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1630
Format I/O context.
Definition: avformat.h:1273
uint8_t
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1341
static const uint8_t header[24]
Definition: sdr2.c:67
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:178
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define AVERROR(e)
Definition: error.h:43
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:175
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1329
AVOutputFormat ff_roq_muxer
Definition: idroqenc.c:64
int void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:198
const char * name
Definition: avformat.h:513
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawenc.c:26
int n
Definition: avisynth_c.h:547
AVIOContext * pb
I/O context.
Definition: avformat.h:1315
main external API structure.
Definition: avcodec.h:1501
Main libavformat public API header.
int den
denominator
Definition: rational.h:45
static int roq_write_header(struct AVFormatContext *s)
Definition: idroqenc.c:26