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vplayerdec.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  * VPlayer subtitles format demuxer
24  */
25 
26 #include "avformat.h"
27 #include "internal.h"
28 #include "subtitles.h"
29 
30 typedef struct {
33 
34 static int vplayer_probe(AVProbeData *p)
35 {
36  char c;
37  const unsigned char *ptr = p->buf;
38 
39  if ((sscanf(ptr, "%*3d:%*2d:%*2d.%*2d%c", &c) == 1 ||
40  sscanf(ptr, "%*3d:%*2d:%*2d%c", &c) == 1) && strchr(": =", c))
41  return AVPROBE_SCORE_MAX;
42  return 0;
43 }
44 
45 static int64_t read_ts(char **line)
46 {
47  char c;
48  int hh, mm, ss, ms, n, len;
49 
50  if (((n = sscanf(*line, "%d:%d:%d.%d%c%n", &hh, &mm, &ss, &ms, &c, &len)) >= 5 ||
51  (n = sscanf(*line, "%d:%d:%d%c%n", &hh, &mm, &ss, &c, &len)) >= 4) && strchr(": =", c)) {
52  *line += len;
53  return (hh*3600LL + mm*60LL + ss) * 100LL + (n < 5 ? 0 : ms);
54  }
55  return AV_NOPTS_VALUE;
56 }
57 
59 {
60  VPlayerContext *vplayer = s->priv_data;
62 
63  if (!st)
64  return AVERROR(ENOMEM);
65  avpriv_set_pts_info(st, 64, 1, 100);
68 
69  while (!avio_feof(s->pb)) {
70  char line[4096];
71  char *p = line;
72  const int64_t pos = avio_tell(s->pb);
73  int len = ff_get_line(s->pb, line, sizeof(line));
74  int64_t pts_start;
75 
76  if (!len)
77  break;
78 
79  line[strcspn(line, "\r\n")] = 0;
80 
81  pts_start = read_ts(&p);
82  if (pts_start != AV_NOPTS_VALUE) {
83  AVPacket *sub;
84 
85  sub = ff_subtitles_queue_insert(&vplayer->q, p, strlen(p), 0);
86  if (!sub)
87  return AVERROR(ENOMEM);
88  sub->pos = pos;
89  sub->pts = pts_start;
90  sub->duration = -1;
91  }
92  }
93 
94  ff_subtitles_queue_finalize(s, &vplayer->q);
95  return 0;
96 }
97 
99 {
100  VPlayerContext *vplayer = s->priv_data;
101  return ff_subtitles_queue_read_packet(&vplayer->q, pkt);
102 }
103 
104 static int vplayer_read_seek(AVFormatContext *s, int stream_index,
105  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
106 {
107  VPlayerContext *vplayer = s->priv_data;
108  return ff_subtitles_queue_seek(&vplayer->q, s, stream_index,
109  min_ts, ts, max_ts, flags);
110 }
111 
113 {
114  VPlayerContext *vplayer = s->priv_data;
115  ff_subtitles_queue_clean(&vplayer->q);
116  return 0;
117 }
118 
120  .name = "vplayer",
121  .long_name = NULL_IF_CONFIG_SMALL("VPlayer subtitles"),
122  .priv_data_size = sizeof(VPlayerContext),
126  .read_seek2 = vplayer_read_seek,
128  .extensions = "txt",
129 };
#define NULL
Definition: coverity.c:32
const char * s
Definition: avisynth_c.h:768
FFDemuxSubtitlesQueue q
Definition: vplayerdec.c:31
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1620
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:4549
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3969
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
Remove and destroy all the subtitles packets.
Definition: subtitles.c:297
static AVPacket pkt
Format I/O context.
Definition: avformat.h:1330
int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt)
Generic read_packet() callback for subtitles demuxers using this queue system.
Definition: subtitles.c:208
int64_t duration
Duration of this packet in AVStream->time_base units, 0 if unknown.
Definition: avcodec.h:1618
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4182
static int vplayer_read_close(AVFormatContext *s)
Definition: vplayerdec.c:112
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
static int vplayer_probe(AVProbeData *p)
Definition: vplayerdec.c:34
static av_always_inline int64_t avio_tell(AVIOContext *s)
ftell() equivalent for AVIOContext.
Definition: avio.h:511
static int64_t read_ts(char **line)
Definition: vplayerdec.c:45
AVInputFormat ff_vplayer_demuxer
Definition: vplayerdec.c:119
#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:176
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3965
Definition: graph2dot.c:48
static int vplayer_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: vplayerdec.c:98
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:463
static int read_probe(AVProbeData *pd)
Definition: jvdec.c:55
static int vplayer_read_header(AVFormatContext *s)
Definition: vplayerdec.c:58
int n
Definition: avisynth_c.h:684
int ff_get_line(AVIOContext *s, char *buf, int maxlen)
Read a whole line of text from AVIOContext.
Definition: aviobuf.c:765
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:514
Stream structure.
Definition: avformat.h:881
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:245
AVIOContext * pb
I/O context.
Definition: avformat.h:1372
#define ss
This structure contains the data a format has to probe a file.
Definition: avformat.h:461
static int flags
Definition: cpu.c:47
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:473
Main libavformat public API header.
static double c[64]
static int vplayer_read_seek(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
Definition: vplayerdec.c:104
int len
void * priv_data
Format private data.
Definition: avformat.h:1358
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:662
AVCodecParameters * codecpar
Definition: avformat.h:1233
int avio_feof(AVIOContext *s)
feof() equivalent for AVIOContext.
Definition: aviobuf.c:328
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:1577
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:193
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1593
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:242