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pjsdec.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  * PJS (Phoenix Japanimation Society) subtitles format demuxer
24  *
25  * @see http://subs.com.ru/page.php?al=pjs
26  */
27 
28 #include "avformat.h"
29 #include "internal.h"
30 #include "subtitles.h"
31 
32 typedef struct {
34 } PJSContext;
35 
36 static int pjs_probe(AVProbeData *p)
37 {
38  char c;
39  int64_t start, end;
40  const unsigned char *ptr = p->buf;
41 
42  if (sscanf(ptr, "%"SCNd64",%"SCNd64",%c", &start, &end, &c) == 3) {
43  size_t q1pos = strcspn(ptr, "\"");
44  size_t q2pos = q1pos + strcspn(ptr + q1pos + 1, "\"") + 1;
45  if (strcspn(ptr, "\r\n") > q2pos)
46  return AVPROBE_SCORE_MAX;
47  }
48  return 0;
49 }
50 
51 static int64_t read_ts(char **line, int *duration)
52 {
53  int64_t start, end;
54 
55  if (sscanf(*line, "%"SCNd64",%"SCNd64, &start, &end) == 2) {
56  *line += strcspn(*line, "\"") + 1;
57  *duration = end - start;
58  return start;
59  }
60  return AV_NOPTS_VALUE;
61 }
62 
64 {
65  PJSContext *pjs = s->priv_data;
66  AVStream *st = avformat_new_stream(s, NULL);
67  int res = 0;
68 
69  if (!st)
70  return AVERROR(ENOMEM);
71  avpriv_set_pts_info(st, 64, 1, 10);
74 
75  while (!url_feof(s->pb)) {
76  char line[4096];
77  char *p = line;
78  const int64_t pos = avio_tell(s->pb);
79  int len = ff_get_line(s->pb, line, sizeof(line));
80  int64_t pts_start;
81  int duration;
82 
83  if (!len)
84  break;
85 
86  line[strcspn(line, "\r\n")] = 0;
87 
88  pts_start = read_ts(&p, &duration);
89  if (pts_start != AV_NOPTS_VALUE) {
90  AVPacket *sub;
91 
92  p[strcspn(p, "\"")] = 0;
93  sub = ff_subtitles_queue_insert(&pjs->q, p, strlen(p), 0);
94  if (!sub)
95  return AVERROR(ENOMEM);
96  sub->pos = pos;
97  sub->pts = pts_start;
98  sub->duration = duration;
99  }
100  }
101 
103  return res;
104 }
105 
107 {
108  PJSContext *pjs = s->priv_data;
109  return ff_subtitles_queue_read_packet(&pjs->q, pkt);
110 }
111 
112 static int pjs_read_seek(AVFormatContext *s, int stream_index,
113  int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
114 {
115  PJSContext *pjs = s->priv_data;
116  return ff_subtitles_queue_seek(&pjs->q, s, stream_index,
117  min_ts, ts, max_ts, flags);
118 }
119 
121 {
122  PJSContext *pjs = s->priv_data;
124  return 0;
125 }
126 
128  .name = "pjs",
129  .long_name = NULL_IF_CONFIG_SMALL("PJS (Phoenix Japanimation Society) subtitles"),
130  .priv_data_size = sizeof(PJSContext),
134  .read_seek2 = pjs_read_seek,
136  .extensions = "pjs",
137 };