FFmpeg
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 
33 // set the actual fps
34  for(n=0;n<s->nb_streams;n++) {
36  unsigned int fps;
37 
38  if (s->streams[n]->avg_frame_rate.den != 1) {
39  av_log(s, AV_LOG_ERROR, "Frame rate must be integer\n");
40  return AVERROR(EINVAL);
41  }
42 
43  if ((fps=s->streams[n]->avg_frame_rate.num) > 255) {
44  av_log(s, AV_LOG_ERROR, "Frame rate may not exceed 255fps\n");
45  return AVERROR(EINVAL);
46  }
47 
48  if (fps != 30) {
49  av_log(s, AV_LOG_WARNING, "For vintage compatibility fps must be 30\n");
50  }
51 
52  header[6] = fps;
53  break;
54  }
55  }
56 
57  avio_write(s->pb, header, 8);
58  avio_flush(s->pb);
59 
60  return 0;
61 }
62 
64  .name = "roq",
65  .long_name = NULL_IF_CONFIG_SMALL("raw id RoQ"),
66  .extensions = "roq",
67  .audio_codec = AV_CODEC_ID_ROQ_DPCM,
68  .video_codec = AV_CODEC_ID_ROQ,
69  .write_header = roq_write_header,
70  .write_packet = ff_raw_write_packet,
71 };
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
int num
Numerator.
Definition: rational.h:59
Format I/O context.
Definition: avformat.h:1358
uint8_t
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
static const uint8_t header[24]
Definition: sdr2.c:67
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:218
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:954
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1414
AVOutputFormat ff_roq_muxer
Definition: idroqenc.c:63
const char * name
Definition: avformat.h:505
#define s(width, name)
Definition: cbs_vp9.c:257
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawenc.c:29
int n
Definition: avisynth_c.h:760
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:238
Main libavformat public API header.
int den
Denominator.
Definition: rational.h:60
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
static int roq_write_header(struct AVFormatContext *s)
Definition: idroqenc.c:26
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions