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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 
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  return AVERROR(ENOMEM);
82  sub->pos = pos;
83  sub->pts = pts_start;
84  sub->duration = -1;
85  }
86  }
87  }
88 
89  ff_subtitles_queue_finalize(&subviewer1->q);
90  return 0;
91 }
92 
94 {
95  SubViewer1Context *subviewer1 = s->priv_data;
96  return ff_subtitles_queue_read_packet(&subviewer1->q, pkt);
97 }
98 
99 static int subviewer1_read_seek(AVFormatContext *s, int stream_index,
100  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
101 {
102  SubViewer1Context *subviewer1 = s->priv_data;
103  return ff_subtitles_queue_seek(&subviewer1->q, s, stream_index,
104  min_ts, ts, max_ts, flags);
105 }
106 
108 {
109  SubViewer1Context *subviewer1 = s->priv_data;
110  ff_subtitles_queue_clean(&subviewer1->q);
111  return 0;
112 }
113 
115  .name = "subviewer1",
116  .long_name = NULL_IF_CONFIG_SMALL("SubViewer v1 subtitle format"),
117  .priv_data_size = sizeof(SubViewer1Context),
121  .read_seek2 = subviewer1_read_seek,
123  .extensions = "sub",
124 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:631
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1447
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:4075
static int subviewer1_read_close(AVFormatContext *s)
static int subviewer1_read_header(AVFormatContext *s)
Definition: subviewer1dec.c:43
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:270
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1273
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:99
int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
Generic read_packet() callback for subtitles demuxers using this queue system.
Definition: subtitles.c:181
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3741
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:390
int duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1440
#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:175
static int subviewer1_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: subviewer1dec.c:93
Definition: graph2dot.c:48
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:861
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:450
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
void ff_subtitles_queue_finalize(FFDemuxSubtitlesQueue *q)
Set missing durations and sort subtitles by PTS, and then byte position.
Definition: subtitles.c:169
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:698
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:620
AVInputFormat ff_subviewer1_demuxer
Stream structure.
Definition: avformat.h:842
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
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:218
enum AVMediaType codec_type
Definition: avcodec.h:1509
enum AVCodecID codec_id
Definition: avcodec.h:1518
AVIOContext * pb
I/O context.
Definition: avformat.h:1315
static int subviewer1_probe(AVProbeData *p)
Definition: subviewer1dec.c:34
#define AVPROBE_SCORE_EXTENSION
score for file extension
Definition: avformat.h:458
This structure contains the data a format has to probe a file.
Definition: avformat.h:448
static int flags
Definition: cpu.c:47
Main libavformat public API header.
int len
FFDemuxSubtitlesQueue q
Definition: subviewer1dec.c:31
void * priv_data
Format private data.
Definition: avformat.h:1301
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:628
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:301
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
This structure stores compressed data.
Definition: avcodec.h:1399
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1415