FFmpeg
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 #include "mux.h"
26 
28 {
29  AVCodecParameters *par = s->streams[0]->codecpar;
30  AVRational framerate = s->streams[0]->avg_frame_rate;
31 
32  if (s->nb_streams != 1 || par->codec_id != AV_CODEC_ID_MICRODVD) {
33  av_log(s, AV_LOG_ERROR, "Exactly one MicroDVD stream is needed.\n");
34  return -1;
35  }
36 
37  if (par->extradata && par->extradata_size > 0) {
38  avio_write(s->pb, "{DEFAULT}{}", 11);
39  avio_write(s->pb, par->extradata, par->extradata_size);
40  avio_w8(s->pb, '\n');
41  }
42 
43  avpriv_set_pts_info(s->streams[0], 64, framerate.num, framerate.den);
44  return 0;
45 }
46 
48 {
49  avio_printf(avf->pb, "{%"PRId64"}", pkt->pts);
50  if (pkt->duration < 0)
51  avio_write(avf->pb, "{}", 2);
52  else
53  avio_printf(avf->pb, "{%"PRId64"}", pkt->pts + pkt->duration);
54  avio_write(avf->pb, pkt->data, pkt->size);
55  avio_w8(avf->pb, '\n');
56  return 0;
57 }
58 
60  .p.name = "microdvd",
61  .p.long_name = NULL_IF_CONFIG_SMALL("MicroDVD subtitle format"),
62  .p.mime_type = "text/x-microdvd",
63  .p.extensions = "sub",
64  .p.flags = AVFMT_NOTIMESTAMPS,
65  .p.subtitle_codec = AV_CODEC_ID_MICRODVD,
66  .write_header = microdvd_write_header,
67  .write_packet = microdvd_write_packet,
68 };
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:69
AVOutputFormat::name
const char * name
Definition: avformat.h:511
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:47
AVFMT_NOTIMESTAMPS
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:480
AVPacket::data
uint8_t * data
Definition: packet.h:522
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:540
FFOutputFormat::p
AVOutputFormat p
The public AVOutputFormat.
Definition: mux.h:36
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:843
pkt
AVPacket * pkt
Definition: movenc.c:59
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:198
AVFormatContext
Format I/O context.
Definition: avformat.h:1363
internal.h
framerate
float framerate
Definition: av1_levels.c:29
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVFormatContext::pb
AVIOContext * pb
I/O context.
Definition: avformat.h:1405
FFOutputFormat
Definition: mux.h:32
avio_w8
void avio_w8(AVIOContext *s, int b)
Definition: aviobuf.c:226
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:73
microdvd_write_packet
static int microdvd_write_packet(AVFormatContext *avf, AVPacket *pkt)
Definition: microdvdenc.c:47
AVPacket::size
int size
Definition: packet.h:523
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:106
microdvd_write_header
static int microdvd_write_header(struct AVFormatContext *s)
Definition: microdvdenc.c:27
avio_write
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:248
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:515
avformat.h
avio_printf
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2
Writes a formatted string to the context.
AV_CODEC_ID_MICRODVD
@ AV_CODEC_ID_MICRODVD
Definition: codec_id.h:561
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:499
ff_microdvd_muxer
const FFOutputFormat ff_microdvd_muxer
Definition: microdvdenc.c:59
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
mux.h