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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 | * VPlayer subtitles format demuxer | |
24 | */ | |
25 | ||
26 | #include "avformat.h" | |
27 | #include "internal.h" | |
28 | #include "subtitles.h" | |
29 | ||
30 | typedef struct { | |
31 | FFDemuxSubtitlesQueue q; | |
32 | } VPlayerContext; | |
33 | ||
34 | static int vplayer_probe(AVProbeData *p) | |
35 | { | |
36 | char c; | |
37 | const unsigned char *ptr = p->buf; | |
38 | ||
39 | if (sscanf(ptr, "%*d:%*d:%*d.%*d%c", &c) == 1 && strchr(": =", c)) | |
40 | return AVPROBE_SCORE_MAX; | |
41 | return 0; | |
42 | } | |
43 | ||
44 | static int64_t read_ts(char **line) | |
45 | { | |
46 | char c; | |
47 | int hh, mm, ss, ms, len; | |
48 | ||
49 | if (sscanf(*line, "%d:%d:%d.%d%c%n", | |
50 | &hh, &mm, &ss, &ms, &c, &len) >= 5) { | |
51 | *line += len; | |
52 | return (hh*3600LL + mm*60LL + ss) * 100LL + ms; | |
53 | } | |
54 | return AV_NOPTS_VALUE; | |
55 | } | |
56 | ||
57 | static int vplayer_read_header(AVFormatContext *s) | |
58 | { | |
59 | VPlayerContext *vplayer = s->priv_data; | |
60 | AVStream *st = avformat_new_stream(s, NULL); | |
61 | ||
62 | if (!st) | |
63 | return AVERROR(ENOMEM); | |
64 | avpriv_set_pts_info(st, 64, 1, 100); | |
65 | st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
66 | st->codec->codec_id = AV_CODEC_ID_VPLAYER; | |
67 | ||
68 | while (!avio_feof(s->pb)) { | |
69 | char line[4096]; | |
70 | char *p = line; | |
71 | const int64_t pos = avio_tell(s->pb); | |
72 | int len = ff_get_line(s->pb, line, sizeof(line)); | |
73 | int64_t pts_start; | |
74 | ||
75 | if (!len) | |
76 | break; | |
77 | ||
78 | line[strcspn(line, "\r\n")] = 0; | |
79 | ||
80 | pts_start = read_ts(&p); | |
81 | if (pts_start != AV_NOPTS_VALUE) { | |
82 | AVPacket *sub; | |
83 | ||
84 | sub = ff_subtitles_queue_insert(&vplayer->q, p, strlen(p), 0); | |
85 | if (!sub) | |
86 | return AVERROR(ENOMEM); | |
87 | sub->pos = pos; | |
88 | sub->pts = pts_start; | |
89 | sub->duration = -1; | |
90 | } | |
91 | } | |
92 | ||
93 | ff_subtitles_queue_finalize(&vplayer->q); | |
94 | return 0; | |
95 | } | |
96 | ||
97 | static int vplayer_read_packet(AVFormatContext *s, AVPacket *pkt) | |
98 | { | |
99 | VPlayerContext *vplayer = s->priv_data; | |
100 | return ff_subtitles_queue_read_packet(&vplayer->q, pkt); | |
101 | } | |
102 | ||
103 | static int vplayer_read_seek(AVFormatContext *s, int stream_index, | |
104 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) | |
105 | { | |
106 | VPlayerContext *vplayer = s->priv_data; | |
107 | return ff_subtitles_queue_seek(&vplayer->q, s, stream_index, | |
108 | min_ts, ts, max_ts, flags); | |
109 | } | |
110 | ||
111 | static int vplayer_read_close(AVFormatContext *s) | |
112 | { | |
113 | VPlayerContext *vplayer = s->priv_data; | |
114 | ff_subtitles_queue_clean(&vplayer->q); | |
115 | return 0; | |
116 | } | |
117 | ||
118 | AVInputFormat ff_vplayer_demuxer = { | |
119 | .name = "vplayer", | |
120 | .long_name = NULL_IF_CONFIG_SMALL("VPlayer subtitles"), | |
121 | .priv_data_size = sizeof(VPlayerContext), | |
122 | .read_probe = vplayer_probe, | |
123 | .read_header = vplayer_read_header, | |
124 | .read_packet = vplayer_read_packet, | |
125 | .read_seek2 = vplayer_read_seek, | |
126 | .read_close = vplayer_read_close, | |
127 | .extensions = "txt", | |
128 | }; |