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supenc.c
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1 /*
2  * SUP muxer
3  * Copyright (c) 2014 Petri Hintukainen <phintuka@users.sourceforge.net>
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 "internal.h"
24 #include "libavutil/intreadwrite.h"
25 
26 #define SUP_PGS_MAGIC 0x5047 /* "PG", big endian */
27 
29 {
30  uint8_t *data = pkt->data;
31  size_t size = pkt->size;
32  uint32_t pts = 0, dts = 0;
33 
34  if (pkt->pts != AV_NOPTS_VALUE) {
35  pts = (uint32_t)pkt->pts;
36  }
37  if (pkt->dts != AV_NOPTS_VALUE) {
38  dts = (uint32_t)pkt->dts;
39  }
40 
41  /*
42  Split frame to segments.
43  mkvmerge stores multiple segments in one frame.
44  */
45  while (size > 2) {
46  size_t len = AV_RB16(data + 1) + 3;
47 
48  if (len > size) {
49  av_log(s, AV_LOG_ERROR, "Not enough data, skipping %d bytes\n",
50  (int)size);
51  return AVERROR_INVALIDDATA;
52  }
53 
54  /* header */
56  avio_wb32(s->pb, pts);
57  avio_wb32(s->pb, dts);
58 
59  avio_write(s->pb, data, len);
60 
61  data += len;
62  size -= len;
63  }
64 
65  if (size > 0) {
66  av_log(s, AV_LOG_ERROR, "Skipping %d bytes after last segment in frame\n",
67  (int)size);
68  return AVERROR_INVALIDDATA;
69  }
70 
71  return 0;
72 }
73 
75 {
76  if (s->nb_streams != 1) {
77  av_log(s, AV_LOG_ERROR, "%s files have exactly one stream\n",
78  s->oformat->name);
79  return AVERROR(EINVAL);
80  }
81 
82  avpriv_set_pts_info(s->streams[0], 32, 1, 90000);
83 
84  return 0;
85 }
86 
88  .name = "sup",
89  .long_name = NULL_IF_CONFIG_SMALL("raw HDMV Presentation Graphic Stream subtitles"),
90  .extensions = "sup",
91  .mime_type = "application/x-pgs",
92  .subtitle_codec = AV_CODEC_ID_HDMV_PGS_SUBTITLE,
93  .write_header = sup_write_header,
94  .write_packet = sup_write_packet,
96 };
const char * s
Definition: avisynth_c.h:768
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
static int sup_write_header(AVFormatContext *s)
Definition: supenc.c:74
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
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:4737
int size
Definition: avcodec.h:1680
static AVPacket pkt
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_WB32 unsigned int_TMPL AV_WB24 unsigned int_TMPL AV_RB16
Definition: bytestream.h:87
#define AVFMT_TS_NONSTRICT
Format does not require strictly increasing timestamps, but they must still be monotonic.
Definition: avformat.h:496
Format I/O context.
Definition: avformat.h:1349
#define SUP_PGS_MAGIC
Definition: supenc.c:26
uint8_t
static int sup_write_packet(AVFormatContext *s, AVPacket *pkt)
Definition: supenc.c:28
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1417
uint8_t * data
Definition: avcodec.h:1679
ptrdiff_t size
Definition: opengl_enc.c:101
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:216
#define av_log(a,...)
struct AVOutputFormat * oformat
The output container format.
Definition: avformat.h:1368
#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:179
AVOutputFormat ff_sup_muxer
Definition: supenc.c:87
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1405
const char * name
Definition: avformat.h:524
AVIOContext * pb
I/O context.
Definition: avformat.h:1391
static int64_t pts
Global timestamp for the audio frames.
void avio_wb16(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:480
Main libavformat public API header.
#define AVFMT_VARIABLE_FPS
Format allows variable fps.
Definition: avformat.h:489
int len
int64_t dts
Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1678
void avio_wb32(AVIOContext *s, unsigned int val)
Definition: aviobuf.c:382
This structure stores compressed data.
Definition: avcodec.h:1656
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1672
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248