FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
mpsubdec.c
Go to the documentation of this file.
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  * MPlayer subtitles format demuxer
24  */
25 
26 #include "avformat.h"
27 #include "internal.h"
28 #include "subtitles.h"
29 
30 typedef struct {
32 } MPSubContext;
33 
34 static int mpsub_probe(AVProbeData *p)
35 {
36  const char *ptr = p->buf;
37  const char *ptr_end = p->buf + p->buf_size;
38 
39  while (ptr < ptr_end) {
40  int n;
41 
42  if (!memcmp(ptr, "FORMAT=TIME", 11) ||
43  sscanf(ptr, "FORMAT=%d", &n) == 1)
44  return AVPROBE_SCORE_MAX/2;
45  ptr += strcspn(ptr, "\n") + 1;
46  }
47  return 0;
48 }
49 
51 {
52  MPSubContext *mpsub = s->priv_data;
53  AVStream *st;
54  AVBPrint buf;
55  AVRational pts_info = (AVRational){ 100, 1 }; // ts based by default
56  int res = 0;
57  float multiplier = 100.0;
58  float current_pts = 0;
59 
61 
62  while (!url_feof(s->pb)) {
63  char line[1024];
64  float start, duration;
65  int fps, len = ff_get_line(s->pb, line, sizeof(line));
66 
67  if (!len)
68  break;
69 
70  line[strcspn(line, "\r\n")] = 0;
71 
72  if (sscanf(line, "FORMAT=%d", &fps) == 1 && fps > 3 && fps < 100) {
73  /* frame based timing */
74  pts_info = (AVRational){ fps, 1 };
75  multiplier = 1.0;
76  } else if (sscanf(line, "%f %f", &start, &duration) == 2) {
77  AVPacket *sub;
78  const int64_t pos = avio_tell(s->pb);
79 
80  ff_subtitles_read_chunk(s->pb, &buf);
81  if (buf.len) {
82  sub = ff_subtitles_queue_insert(&mpsub->q, buf.str, buf.len, 0);
83  if (!sub) {
84  res = AVERROR(ENOMEM);
85  goto end;
86  }
87  sub->pts = (int64_t)(current_pts + start*multiplier);
88  sub->duration = (int)(duration * multiplier);
89  current_pts += (start + duration) * multiplier;
90  sub->pos = pos;
91  }
92  }
93  }
94 
95  st = avformat_new_stream(s, NULL);
96  if (!st)
97  return AVERROR(ENOMEM);
98  avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
101 
103 
104 end:
105  av_bprint_finalize(&buf, NULL);
106  return res;
107 }
108 
110 {
111  MPSubContext *mpsub = s->priv_data;
112  return ff_subtitles_queue_read_packet(&mpsub->q, pkt);
113 }
114 
115 static int mpsub_read_seek(AVFormatContext *s, int stream_index,
116  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
117 {
118  MPSubContext *mpsub = s->priv_data;
119  return ff_subtitles_queue_seek(&mpsub->q, s, stream_index,
120  min_ts, ts, max_ts, flags);
121 }
122 
124 {
125  MPSubContext *mpsub = s->priv_data;
126  ff_subtitles_queue_clean(&mpsub->q);
127  return 0;
128 }
129 
131  .name = "mpsub",
132  .long_name = NULL_IF_CONFIG_SMALL("MPlayer subtitles"),
133  .priv_data_size = sizeof(MPSubContext),
137  .read_seek2 = mpsub_read_seek,
139  .extensions = "sub",
140 };