FFmpeg: libavformat/supenc.c Source File

FFmpeg

libavformat

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 "mux.h"

25 #include "libavutil/intreadwrite.h"

26

27 #define SUP_PGS_MAGIC 0x5047 /* "PG", big endian */

28

29 static int sup_write_packet(AVFormatContext *s, AVPacket *pkt)

30 {

31 const uint8_t *data = pkt->data;

32 size_t size = pkt->size;

33 uint32_t pts = 0, dts = 0;

34

35 if (pkt->pts != AV_NOPTS_VALUE) {

36 pts = pkt->pts;

37 }

38 if (pkt->dts != AV_NOPTS_VALUE) {

39 dts = pkt->dts;

40 }

41

42 /*

43 Split frame to segments.

44 mkvmerge stores multiple segments in one frame.

45 */

46 while (size > 2) {

47 size_t len = AV_RB16(data + 1) + 3;

48

49 if (len > size) {

50 av_log(s, AV_LOG_ERROR, "Not enough data, skipping %"SIZE_SPECIFIER " bytes\n",

51 size);

52 return AVERROR_INVALIDDATA;

53 }

54

55 /* header */

56 avio_wb16(s->pb, SUP_PGS_MAGIC);

57 avio_wb32(s->pb, pts);

58 avio_wb32(s->pb, dts);

59

60 avio_write(s->pb, data, len);

61

62 data += len;

63 size -= len;

64 }

65

66 if (size > 0) {

67 av_log(s, AV_LOG_ERROR, "Skipping %"SIZE_SPECIFIER " bytes after last segment in frame\n",

68 size);

69 return AVERROR_INVALIDDATA;

70 }

71

72 return 0;

73 }

74

75 static av_cold int sup_init(AVFormatContext *s)

76 {

77 avpriv_set_pts_info(s->streams[0], 32, 1, 90000);

78

79 return 0;

80 }

81

82 const FFOutputFormat ff_sup_muxer = {

83 .p.name = "sup",

84 .p.long_name = NULL_IF_CONFIG_SMALL("raw HDMV Presentation Graphic Stream subtitles"),

85 .p.extensions = "sup",

86 .p.mime_type = "application/x-pgs",

87 .p.video_codec = AV_CODEC_ID_NONE,

88 .p.audio_codec = AV_CODEC_ID_NONE,

89 .p.subtitle_codec = AV_CODEC_ID_HDMV_PGS_SUBTITLE,

90 .p.flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT,

91 .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH,

92 .init = sup_init,

93 .write_packet = sup_write_packet,

94 };

AVOutputFormat::name

const char * name

Definition: avformat.h:510

AVFMT_VARIABLE_FPS

#define AVFMT_VARIABLE_FPS

Format allows variable fps.

Definition: avformat.h:482

uint8_t * data

Definition: packet.h:522

const char data[16]

Definition: mxf.c:148

AV_CODEC_ID_HDMV_PGS_SUBTITLE

@ AV_CODEC_ID_HDMV_PGS_SUBTITLE

Definition: codec_id.h:555

FFOutputFormat::p

AVOutputFormat p

The public AVOutputFormat.

Definition: mux.h:65

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:853

static int64_t pts

Definition: transcode_aac.c:643

AVPacket * pkt

Definition: movenc.c:59

#define AV_LOG_ERROR

Something went wrong and cannot losslessly be recovered.

Definition: log.h:180

#define av_cold

Definition: attributes.h:90

s

#define s(width, name)

Definition: cbs_vp9.c:198

AVFormatContext

Format I/O context.

Definition: avformat.h:1255

const FFOutputFormat ff_sup_muxer

Definition: supenc.c:82

Definition: mux.h:61

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

#define SUP_PGS_MAGIC

Definition: supenc.c:27

int size

Definition: twinvq_data.h:10344

#define AV_NOPTS_VALUE

Undefined timestamp value.

Definition: avutil.h:248

int64_t dts

Decompression timestamp in AVStream->time_base units; the time at which the packet is decompressed.

Definition: packet.h:521

void avio_write(AVIOContext *s, const unsigned char *buf, int size)

Definition: aviobuf.c:200

void avio_wb32(AVIOContext *s, unsigned int val)

Definition: aviobuf.c:364

AV_CODEC_ID_NONE

@ AV_CODEC_ID_NONE

Definition: codec_id.h:50

int64_t pts

Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...

Definition: packet.h:515

FF_OFMT_FLAG_MAX_ONE_OF_EACH

#define FF_OFMT_FLAG_MAX_ONE_OF_EACH

If this flag is set, it indicates that for each codec type whose corresponding default codec (i....

Definition: mux.h:50

int len

Definition: vorbis_enc_data.h:426

AVFMT_TS_NONSTRICT

#define AVFMT_TS_NONSTRICT

Format does not require strictly increasing timestamps, but they must still be monotonic.

Definition: avformat.h:491

#define SIZE_SPECIFIER

Definition: internal.h:141

static av_cold int sup_init(AVFormatContext *s)

Definition: supenc.c:75

sup_write_packet

static int sup_write_packet(AVFormatContext *s, AVPacket *pkt)

Definition: supenc.c:29

This structure stores compressed data.

Definition: packet.h:499

void avio_wb16(AVIOContext *s, unsigned int val)

Definition: aviobuf.c:442

#define av_log(a,...)

Definition: tableprint_vlc.h:27

AVERROR_INVALIDDATA

#define AVERROR_INVALIDDATA

Invalid data found when processing input.

Definition: error.h:61

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:98

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