FFmpeg
idroqenc.c
Go to the documentation of this file.
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++) {
35  if (s->streams[n]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
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 
59  return 0;
60 }
61 
63  .name = "roq",
64  .long_name = NULL_IF_CONFIG_SMALL("raw id RoQ"),
65  .extensions = "roq",
66  .audio_codec = AV_CODEC_ID_ROQ_DPCM,
67  .video_codec = AV_CODEC_ID_ROQ,
68  .write_header = roq_write_header,
69  .write_packet = ff_raw_write_packet,
70 };
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
AVOutputFormat::name
const char * name
Definition: avformat.h:496
AVERROR
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
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
s
#define s(width, name)
Definition: cbs_vp9.c:257
ff_raw_write_packet
int ff_raw_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: rawenc.c:29
ff_roq_muxer
const AVOutputFormat ff_roq_muxer
Definition: idroqenc.c:62
AVFormatContext
Format I/O context.
Definition: avformat.h:1107
AV_CODEC_ID_ROQ_DPCM
@ AV_CODEC_ID_ROQ_DPCM
Definition: codec_id.h:413
AV_CODEC_ID_ROQ
@ AV_CODEC_ID_ROQ
Definition: codec_id.h:88
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:116
header
static const uint8_t header[24]
Definition: sdr2.c:67
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:215
rawenc.h
AVOutputFormat
Definition: avformat.h:495
roq_write_header
static int roq_write_header(struct AVFormatContext *s)
Definition: idroqenc.c:26
avformat.h
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28