blob: bb587b569a1b7362a33578772c3bfb48fd0d1254
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 | |
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, "\""); |
57 | *line += !!**line; |
58 | *duration = end - start; |
59 | return start; |
60 | } |
61 | return AV_NOPTS_VALUE; |
62 | } |
63 | |
64 | static int pjs_read_header(AVFormatContext *s) |
65 | { |
66 | PJSContext *pjs = s->priv_data; |
67 | AVStream *st = avformat_new_stream(s, NULL); |
68 | int res = 0; |
69 | |
70 | if (!st) |
71 | return AVERROR(ENOMEM); |
72 | avpriv_set_pts_info(st, 64, 1, 10); |
73 | st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; |
74 | st->codecpar->codec_id = AV_CODEC_ID_PJS; |
75 | |
76 | while (!avio_feof(s->pb)) { |
77 | char line[4096]; |
78 | char *p = line; |
79 | const int64_t pos = avio_tell(s->pb); |
80 | int len = ff_get_line(s->pb, line, sizeof(line)); |
81 | int64_t pts_start; |
82 | int duration; |
83 | |
84 | if (!len) |
85 | break; |
86 | |
87 | line[strcspn(line, "\r\n")] = 0; |
88 | |
89 | pts_start = read_ts(&p, &duration); |
90 | if (pts_start != AV_NOPTS_VALUE) { |
91 | AVPacket *sub; |
92 | |
93 | p[strcspn(p, "\"")] = 0; |
94 | sub = ff_subtitles_queue_insert(&pjs->q, p, strlen(p), 0); |
95 | if (!sub) |
96 | return AVERROR(ENOMEM); |
97 | sub->pos = pos; |
98 | sub->pts = pts_start; |
99 | sub->duration = duration; |
100 | } |
101 | } |
102 | |
103 | ff_subtitles_queue_finalize(s, &pjs->q); |
104 | return res; |
105 | } |
106 | |
107 | static int pjs_read_packet(AVFormatContext *s, AVPacket *pkt) |
108 | { |
109 | PJSContext *pjs = s->priv_data; |
110 | return ff_subtitles_queue_read_packet(&pjs->q, pkt); |
111 | } |
112 | |
113 | static int pjs_read_seek(AVFormatContext *s, int stream_index, |
114 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
115 | { |
116 | PJSContext *pjs = s->priv_data; |
117 | return ff_subtitles_queue_seek(&pjs->q, s, stream_index, |
118 | min_ts, ts, max_ts, flags); |
119 | } |
120 | |
121 | static int pjs_read_close(AVFormatContext *s) |
122 | { |
123 | PJSContext *pjs = s->priv_data; |
124 | ff_subtitles_queue_clean(&pjs->q); |
125 | return 0; |
126 | } |
127 | |
128 | AVInputFormat ff_pjs_demuxer = { |
129 | .name = "pjs", |
130 | .long_name = NULL_IF_CONFIG_SMALL("PJS (Phoenix Japanimation Society) subtitles"), |
131 | .priv_data_size = sizeof(PJSContext), |
132 | .read_probe = pjs_probe, |
133 | .read_header = pjs_read_header, |
134 | .read_packet = pjs_read_packet, |
135 | .read_seek2 = pjs_read_seek, |
136 | .read_close = pjs_read_close, |
137 | .extensions = "pjs", |
138 | }; |
139 |