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 {
33 FFDemuxSubtitlesQueue q;
34 } PJSContext;
35
pjs_probe(const AVProbeData * p)36 static int pjs_probe(const 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
read_ts(char ** line,int * duration)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, "\"");
57 *line += !!**line;
58 if (end < start || end - (uint64_t)start > INT_MAX)
59 return AV_NOPTS_VALUE;
60 *duration = end - start;
61 return start;
62 }
63 return AV_NOPTS_VALUE;
64 }
65
pjs_read_header(AVFormatContext * s)66 static int pjs_read_header(AVFormatContext *s)
67 {
68 PJSContext *pjs = s->priv_data;
69 AVStream *st = avformat_new_stream(s, NULL);
70 int res = 0;
71
72 if (!st)
73 return AVERROR(ENOMEM);
74 avpriv_set_pts_info(st, 64, 1, 10);
75 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
76 st->codecpar->codec_id = AV_CODEC_ID_PJS;
77
78 while (!avio_feof(s->pb)) {
79 char line[4096];
80 char *p = line;
81 const int64_t pos = avio_tell(s->pb);
82 int len = ff_get_line(s->pb, line, sizeof(line));
83 int64_t pts_start;
84 int duration;
85
86 if (!len)
87 break;
88
89 line[strcspn(line, "\r\n")] = 0;
90
91 pts_start = read_ts(&p, &duration);
92 if (pts_start != AV_NOPTS_VALUE) {
93 AVPacket *sub;
94
95 p[strcspn(p, "\"")] = 0;
96 sub = ff_subtitles_queue_insert(&pjs->q, p, strlen(p), 0);
97 if (!sub) {
98 ff_subtitles_queue_clean(&pjs->q);
99 return AVERROR(ENOMEM);
100 }
101 sub->pos = pos;
102 sub->pts = pts_start;
103 sub->duration = duration;
104 }
105 }
106
107 ff_subtitles_queue_finalize(s, &pjs->q);
108 return res;
109 }
110
pjs_read_packet(AVFormatContext * s,AVPacket * pkt)111 static int pjs_read_packet(AVFormatContext *s, AVPacket *pkt)
112 {
113 PJSContext *pjs = s->priv_data;
114 return ff_subtitles_queue_read_packet(&pjs->q, pkt);
115 }
116
pjs_read_seek(AVFormatContext * s,int stream_index,int64_t min_ts,int64_t ts,int64_t max_ts,int flags)117 static int pjs_read_seek(AVFormatContext *s, int stream_index,
118 int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
119 {
120 PJSContext *pjs = s->priv_data;
121 return ff_subtitles_queue_seek(&pjs->q, s, stream_index,
122 min_ts, ts, max_ts, flags);
123 }
124
pjs_read_close(AVFormatContext * s)125 static int pjs_read_close(AVFormatContext *s)
126 {
127 PJSContext *pjs = s->priv_data;
128 ff_subtitles_queue_clean(&pjs->q);
129 return 0;
130 }
131
132 AVInputFormat ff_pjs_demuxer = {
133 .name = "pjs",
134 .long_name = NULL_IF_CONFIG_SMALL("PJS (Phoenix Japanimation Society) subtitles"),
135 .priv_data_size = sizeof(PJSContext),
136 .read_probe = pjs_probe,
137 .read_header = pjs_read_header,
138 .read_packet = pjs_read_packet,
139 .read_seek2 = pjs_read_seek,
140 .read_close = pjs_read_close,
141 .extensions = "pjs",
142 };
143