FFmpeg
subviewer1dec.c
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1 /*
2  * Copyright (c) 2012 Clément Bœsch
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * SubViewer v1 subtitle demuxer
24  */
25 
26 #include "avformat.h"
27 #include "internal.h"
28 #include "subtitles.h"
29 
30 typedef struct {
33 
34 static int subviewer1_probe(const AVProbeData *p)
35 {
36  const unsigned char *ptr = p->buf;
37 
38  if (strstr(ptr, "******** START SCRIPT ********"))
40  return 0;
41 }
42 
44 {
45  int delay = 0;
46  AVPacket *sub = NULL;
47  SubViewer1Context *subviewer1 = s->priv_data;
49 
50  if (!st)
51  return AVERROR(ENOMEM);
52  avpriv_set_pts_info(st, 64, 1, 1);
55 
56  while (!avio_feof(s->pb)) {
57  char line[4096];
58  int len = ff_get_line(s->pb, line, sizeof(line));
59  int hh, mm, ss;
60 
61  if (!len)
62  break;
63 
64  if (!strncmp(line, "[DELAY]", 7)) {
65  ff_get_line(s->pb, line, sizeof(line));
66  sscanf(line, "%d", &delay);
67  }
68 
69  if (sscanf(line, "[%d:%d:%d]", &hh, &mm, &ss) == 3) {
70  const int64_t pos = avio_tell(s->pb);
71  int64_t pts_start = hh*3600LL + mm*60LL + ss + delay;
72 
73  len = ff_get_line(s->pb, line, sizeof(line));
74  line[strcspn(line, "\r\n")] = 0;
75  if (!*line) {
76  if (sub)
77  sub->duration = pts_start - sub->pts;
78  } else {
79  sub = ff_subtitles_queue_insert(&subviewer1->q, line, len, 0);
80  if (!sub) {
81  ff_subtitles_queue_clean(&subviewer1->q);
82  return AVERROR(ENOMEM);
83  }
84  sub->pos = pos;
85  sub->pts = pts_start;
86  sub->duration = -1;
87  }
88  }
89  }
90 
91  ff_subtitles_queue_finalize(s, &subviewer1->q);
92  return 0;
93 }
94 
96 {
97  SubViewer1Context *subviewer1 = s->priv_data;
98  return ff_subtitles_queue_read_packet(&subviewer1->q, pkt);
99 }
100 
101 static int subviewer1_read_seek(AVFormatContext *s, int stream_index,
102  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
103 {
104  SubViewer1Context *subviewer1 = s->priv_data;
105  return ff_subtitles_queue_seek(&subviewer1->q, s, stream_index,
106  min_ts, ts, max_ts, flags);
107 }
108 
110 {
111  SubViewer1Context *subviewer1 = s->priv_data;
112  ff_subtitles_queue_clean(&subviewer1->q);
113  return 0;
114 }
115 
117  .name = "subviewer1",
118  .long_name = NULL_IF_CONFIG_SMALL("SubViewer v1 subtitle format"),
119  .priv_data_size = sizeof(SubViewer1Context),
123  .read_seek2 = subviewer1_read_seek,
125  .extensions = "sub",
126 };
AVMEDIA_TYPE_SUBTITLE
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4526
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
subviewer1_read_close
static int subviewer1_read_close(AVFormatContext *s)
Definition: subviewer1dec.c:109
subviewer1_read_header
static int subviewer1_read_header(AVFormatContext *s)
Definition: subviewer1dec.c:43
AVPacket::duration
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: packet.h:373
subviewer1_read_seek
static int subviewer1_read_seek(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Definition: subviewer1dec.c:101
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
avio_tell
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:557
SubViewer1Context
Definition: subviewer1dec.c:30
AV_CODEC_ID_SUBVIEWER1
@ AV_CODEC_ID_SUBVIEWER1
Definition: codec_id.h:524
ss
#define ss(width, name, subs,...)
Definition: cbs_vp9.c:261
ff_subtitles_queue_seek
int ff_subtitles_queue_seek(FFDemuxSubtitlesQueue *q, AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Update current_sub_idx to emulate a seek.
Definition: subtitles.c:250
AVInputFormat
Definition: avformat.h:636
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:641
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
ff_subtitles_queue_read_packet
int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
Generic read_packet() callback for subtitles demuxers using this queue system.
Definition: subtitles.c:212
AVFormatContext
Format I/O context.
Definition: avformat.h:1335
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1012
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
subviewer1_read_packet
static int subviewer1_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: subviewer1dec.c:95
NULL
#define NULL
Definition: coverity.c:32
SubViewer1Context::q
FFDemuxSubtitlesQueue q
Definition: subviewer1dec.c:31
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
ff_subtitles_queue_insert
AVPacket * ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q, const uint8_t *event, size_t len, int merge)
Insert a new subtitle event.
Definition: subtitles.c:111
AVPROBE_SCORE_EXTENSION
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:451
subviewer1_probe
static int subviewer1_probe(const AVProbeData *p)
Definition: subviewer1dec.c:34
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:188
ff_subviewer1_demuxer
AVInputFormat ff_subviewer1_demuxer
Definition: subviewer1dec.c:116
avpriv_set_pts_info
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:4948
ff_subtitles_queue_finalize
void ff_subtitles_queue_finalize(void *log_ctx, FFDemuxSubtitlesQueue *q)
Set missing durations, sort subtitles by PTS (and then byte position), and drop duplicated events.
Definition: subtitles.c:194
FFDemuxSubtitlesQueue
Definition: subtitles.h:102
ff_subtitles_queue_clean
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:302
line
Definition: graph2dot.c:48
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:348
ff_get_line
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:786
len
int len
Definition: vorbis_enc_data.h:452
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:865
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
subtitles.h
pkt
static AVPacket pkt
Definition: demuxing_decoding.c:54
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:332
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:375
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:565
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:356