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microdvdenc.c
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1 /*
2  * MicroDVD subtitle muxer
3  * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
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 <inttypes.h>
23 #include "avformat.h"
24 #include "internal.h"
25 
27 {
28  AVCodecParameters *par = s->streams[0]->codecpar;
29  AVRational framerate = s->streams[0]->avg_frame_rate;
30 
31  if (s->nb_streams != 1 || par->codec_id != AV_CODEC_ID_MICRODVD) {
32  av_log(s, AV_LOG_ERROR, "Exactly one MicroDVD stream is needed.\n");
33  return -1;
34  }
35 
36  if (par->extradata && par->extradata_size > 0) {
37  avio_write(s->pb, "{DEFAULT}{}", 11);
38  avio_write(s->pb, par->extradata, par->extradata_size);
39  avio_flush(s->pb);
40  }
41 
42  avpriv_set_pts_info(s->streams[0], 64, framerate.num, framerate.den);
43  return 0;
44 }
45 
47 {
48  avio_printf(avf->pb, "{%"PRId64"}", pkt->pts);
49  if (pkt->duration < 0)
50  avio_write(avf->pb, "{}", 2);
51  else
52  avio_printf(avf->pb, "{%"PRId64"}", pkt->pts + pkt->duration);
53  avio_write(avf->pb, pkt->data, pkt->size);
54  avio_write(avf->pb, "\n", 1);
55  return 0;
56 }
57 
59  .name = "microdvd",
60  .long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"),
61  .mime_type = "text/x-microdvd",
62  .extensions = "sub",
63  .write_header = microdvd_write_header,
64  .write_packet = microdvd_write_packet,
65  .flags = AVFMT_NOTIMESTAMPS,
66  .subtitle_codec = AV_CODEC_ID_MICRODVD,
67 };
const char * s
Definition: avisynth_c.h:768
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4581
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3981
int num
Numerator.
Definition: rational.h:59
int size
Definition: avcodec.h:1602
static AVPacket pkt
This struct describes the properties of an encoded stream.
Definition: avcodec.h:3973
Format I/O context.
Definition: avformat.h:1338
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1619
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1406
uint8_t * data
Definition: avcodec.h:1601
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:204
#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:176
AVOutputFormat ff_microdvd_muxer
Definition: microdvdenc.c:58
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:967
int extradata_size
Size of the extradata content in bytes.
Definition: avcodec.h:3999
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1394
int void avio_flush(AVIOContext *s)
Force flushing of buffered data.
Definition: aviobuf.c:224
const char * name
Definition: avformat.h:524
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:486
AVIOContext * pb
I/O context.
Definition: avformat.h:1380
Rational number (pair of numerator and denominator).
Definition: rational.h:58
Main libavformat public API header.
static int microdvd_write_packet(AVFormatContext *avf, AVPacket *pkt)
Definition: microdvdenc.c:46
int den
Denominator.
Definition: rational.h:60
static int microdvd_write_header(struct AVFormatContext *s)
Definition: microdvdenc.c:26
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: avcodec.h:3995
AVCodecParameters * codecpar
Definition: avformat.h:1241
This structure stores compressed data.
Definition: avcodec.h:1578
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1594
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2