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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 { | |
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->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
74 | st->codec->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(&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 | }; |