blob: 532fa6aefad86a6a2ebf806d31501f269fc3c694
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->codecpar->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 | }; |
102 |