Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavformat / mpsubdec.c
... / ...
CommitLineData
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
30typedef struct {
31 FFDemuxSubtitlesQueue q;
32} MPSubContext;
33
34static 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
54static 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 float multiplier = 100.0;
62 float 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 float 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 = 1.0;
80 } else if (sscanf(line, "%f %f", &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->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
104 st->codec->codec_id = AV_CODEC_ID_TEXT;
105
106 ff_subtitles_queue_finalize(&mpsub->q);
107
108end:
109 av_bprint_finalize(&buf, NULL);
110 return res;
111}
112
113static 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
119static 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
127static 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
134AVInputFormat 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};