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1 | /* |
2 | * Copyright (C) 2010 David Conrad | |
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 | #include "libavcodec/bytestream.h" | |
22 | #include "avformat.h" | |
23 | #include "internal.h" | |
24 | #include "oggdec.h" | |
25 | ||
26 | static int skeleton_header(AVFormatContext *s, int idx) | |
27 | { | |
28 | struct ogg *ogg = s->priv_data; | |
29 | struct ogg_stream *os = ogg->streams + idx; | |
30 | AVStream *st = s->streams[idx]; | |
31 | uint8_t *buf = os->buf + os->pstart; | |
32 | int version_major, version_minor; | |
33 | int64_t start_num, start_den; | |
34 | uint64_t start_granule; | |
35 | int target_idx, start_time; | |
36 | ||
37 | st->codec->codec_type = AVMEDIA_TYPE_DATA; | |
38 | ||
39 | if ((os->flags & OGG_FLAG_EOS) && os->psize == 0) | |
40 | return 1; | |
41 | ||
42 | if (os->psize < 8) | |
43 | return -1; | |
44 | ||
45 | if (!strncmp(buf, "fishead", 8)) { | |
46 | if (os->psize < 64) | |
47 | return -1; | |
48 | ||
49 | version_major = AV_RL16(buf+8); | |
50 | version_minor = AV_RL16(buf+10); | |
51 | ||
52 | if (version_major != 3 && version_major != 4) { | |
53 | av_log(s, AV_LOG_WARNING, "Unknown skeleton version %d.%d\n", | |
54 | version_major, version_minor); | |
55 | return -1; | |
56 | } | |
57 | ||
58 | // This is the overall start time. We use it for the start time of | |
59 | // of the skeleton stream since if left unset lavf assumes 0, | |
60 | // which we don't want since skeleton is timeless | |
61 | // FIXME: the real meaning of this field is "start playback at | |
62 | // this time which can be in the middle of a packet | |
63 | start_num = AV_RL64(buf+12); | |
64 | start_den = AV_RL64(buf+20); | |
65 | ||
66 | if (start_den > 0 && start_num > 0) { | |
67 | int base_den; | |
68 | av_reduce(&start_time, &base_den, start_num, start_den, INT_MAX); | |
69 | avpriv_set_pts_info(st, 64, 1, base_den); | |
70 | os->lastpts = | |
71 | st->start_time = start_time; | |
72 | } | |
73 | } else if (!strncmp(buf, "fisbone", 8)) { | |
74 | if (os->psize < 52) | |
75 | return -1; | |
76 | ||
77 | target_idx = ogg_find_stream(ogg, AV_RL32(buf+12)); | |
78 | start_granule = AV_RL64(buf+36); | |
79 | if (target_idx < 0) { | |
80 | av_log(s, AV_LOG_WARNING, "Serial number in fisbone doesn't match any stream\n"); | |
81 | return 1; | |
82 | } | |
83 | os = ogg->streams + target_idx; | |
84 | if (os->start_granule != OGG_NOGRANULE_VALUE) { | |
85 | av_log(s, AV_LOG_WARNING, "Multiple fisbone for the same stream\n"); | |
86 | return 1; | |
87 | } | |
88 | if (start_granule != OGG_NOGRANULE_VALUE) { | |
89 | os->start_granule = start_granule; | |
90 | } | |
91 | } | |
92 | ||
93 | return 1; | |
94 | } | |
95 | ||
96 | const struct ogg_codec ff_skeleton_codec = { | |
97 | .magic = "fishead", | |
98 | .magicsize = 8, | |
99 | .header = skeleton_header, | |
100 | .nb_header = 0, | |
101 | }; |