blob: 1236efa712f580ad2f3f16eb30d09391bfd0b6af
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 | * MPlayer 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 | } MPSubContext; |
33 | |
34 | static int mpsub_probe(AVProbeData *p) |
35 | { |
36 | const char *ptr = p->buf; |
37 | const char *ptr_end = p->buf + p->buf_size; |
38 | |
39 | while (ptr < ptr_end) { |
40 | int inc; |
41 | |
42 | if (!memcmp(ptr, "FORMAT=TIME", 11)) |
43 | return AVPROBE_SCORE_EXTENSION; |
44 | if (!memcmp(ptr, "FORMAT=", 7)) |
45 | return AVPROBE_SCORE_EXTENSION / 3; |
46 | inc = ff_subtitles_next_line(ptr); |
47 | if (!inc) |
48 | break; |
49 | ptr += inc; |
50 | } |
51 | return 0; |
52 | } |
53 | |
54 | static int mpsub_read_header(AVFormatContext *s) |
55 | { |
56 | MPSubContext *mpsub = s->priv_data; |
57 | AVStream *st; |
58 | AVBPrint buf; |
59 | AVRational pts_info = (AVRational){ 100, 1 }; // ts based by default |
60 | int res = 0; |
61 | int multiplier = 100; |
62 | double current_pts = 0; |
63 | |
64 | av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
65 | |
66 | while (!avio_feof(s->pb)) { |
67 | char line[1024]; |
68 | double start, duration; |
69 | int fps, len = ff_get_line(s->pb, line, sizeof(line)); |
70 | |
71 | if (!len) |
72 | break; |
73 | |
74 | line[strcspn(line, "\r\n")] = 0; |
75 | |
76 | if (sscanf(line, "FORMAT=%d", &fps) == 1 && fps > 3 && fps < 100) { |
77 | /* frame based timing */ |
78 | pts_info = (AVRational){ fps, 1 }; |
79 | multiplier = 1; |
80 | } else if (sscanf(line, "%lf %lf", &start, &duration) == 2) { |
81 | AVPacket *sub; |
82 | const int64_t pos = avio_tell(s->pb); |
83 | |
84 | ff_subtitles_read_chunk(s->pb, &buf); |
85 | if (buf.len) { |
86 | sub = ff_subtitles_queue_insert(&mpsub->q, buf.str, buf.len, 0); |
87 | if (!sub) { |
88 | res = AVERROR(ENOMEM); |
89 | goto end; |
90 | } |
91 | sub->pts = (int64_t)(current_pts + start*multiplier); |
92 | sub->duration = (int)(duration * multiplier); |
93 | current_pts += (start + duration) * multiplier; |
94 | sub->pos = pos; |
95 | } |
96 | } |
97 | } |
98 | |
99 | st = avformat_new_stream(s, NULL); |
100 | if (!st) |
101 | return AVERROR(ENOMEM); |
102 | avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num); |
103 | st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; |
104 | st->codecpar->codec_id = AV_CODEC_ID_TEXT; |
105 | |
106 | ff_subtitles_queue_finalize(s, &mpsub->q); |
107 | |
108 | end: |
109 | av_bprint_finalize(&buf, NULL); |
110 | return res; |
111 | } |
112 | |
113 | static int mpsub_read_packet(AVFormatContext *s, AVPacket *pkt) |
114 | { |
115 | MPSubContext *mpsub = s->priv_data; |
116 | return ff_subtitles_queue_read_packet(&mpsub->q, pkt); |
117 | } |
118 | |
119 | static int mpsub_read_seek(AVFormatContext *s, int stream_index, |
120 | int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
121 | { |
122 | MPSubContext *mpsub = s->priv_data; |
123 | return ff_subtitles_queue_seek(&mpsub->q, s, stream_index, |
124 | min_ts, ts, max_ts, flags); |
125 | } |
126 | |
127 | static int mpsub_read_close(AVFormatContext *s) |
128 | { |
129 | MPSubContext *mpsub = s->priv_data; |
130 | ff_subtitles_queue_clean(&mpsub->q); |
131 | return 0; |
132 | } |
133 | |
134 | AVInputFormat ff_mpsub_demuxer = { |
135 | .name = "mpsub", |
136 | .long_name = NULL_IF_CONFIG_SMALL("MPlayer subtitles"), |
137 | .priv_data_size = sizeof(MPSubContext), |
138 | .read_probe = mpsub_probe, |
139 | .read_header = mpsub_read_header, |
140 | .read_packet = mpsub_read_packet, |
141 | .read_seek2 = mpsub_read_seek, |
142 | .read_close = mpsub_read_close, |
143 | .extensions = "sub", |
144 | }; |
145 |