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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6148 | serge | 1 | /* |
| 2 | * Copyright (C) 2010 David Conrad |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #include "libavcodec/bytestream.h" |
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| 22 | #include "avformat.h" |
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| 23 | #include "internal.h" |
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| 24 | #include "oggdec.h" |
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| 25 | |||
| 26 | static int skeleton_header(AVFormatContext *s, int idx) |
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| 27 | { |
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| 28 | struct ogg *ogg = s->priv_data; |
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| 29 | struct ogg_stream *os = ogg->streams + idx; |
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| 30 | AVStream *st = s->streams[idx]; |
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| 31 | uint8_t *buf = os->buf + os->pstart; |
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| 32 | int version_major, version_minor; |
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| 33 | int64_t start_num, start_den; |
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| 34 | uint64_t start_granule; |
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| 35 | int target_idx, start_time; |
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| 36 | |||
| 37 | strcpy(st->codec->codec_name, "skeleton"); |
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| 38 | st->codec->codec_type = AVMEDIA_TYPE_DATA; |
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| 39 | |||
| 40 | if ((os->flags & OGG_FLAG_EOS) && os->psize == 0) |
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| 41 | return 1; |
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| 42 | |||
| 43 | if (os->psize < 8) |
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| 44 | return -1; |
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| 45 | |||
| 46 | if (!strncmp(buf, "fishead", 8)) { |
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| 47 | if (os->psize < 64) |
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| 48 | return -1; |
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| 49 | |||
| 50 | version_major = AV_RL16(buf+8); |
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| 51 | version_minor = AV_RL16(buf+10); |
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| 52 | |||
| 53 | if (version_major != 3 && version_major != 4) { |
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| 54 | av_log(s, AV_LOG_WARNING, "Unknown skeleton version %d.%d\n", |
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| 55 | version_major, version_minor); |
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| 56 | return -1; |
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| 57 | } |
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| 58 | |||
| 59 | // This is the overall start time. We use it for the start time of |
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| 60 | // of the skeleton stream since if left unset lavf assumes 0, |
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| 61 | // which we don't want since skeleton is timeless |
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| 62 | // FIXME: the real meaning of this field is "start playback at |
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| 63 | // this time which can be in the middle of a packet |
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| 64 | start_num = AV_RL64(buf+12); |
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| 65 | start_den = AV_RL64(buf+20); |
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| 66 | |||
| 67 | if (start_den > 0 && start_num > 0) { |
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| 68 | int base_den; |
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| 69 | av_reduce(&start_time, &base_den, start_num, start_den, INT_MAX); |
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| 70 | avpriv_set_pts_info(st, 64, 1, base_den); |
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| 71 | os->lastpts = |
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| 72 | st->start_time = start_time; |
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| 73 | } |
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| 74 | } else if (!strncmp(buf, "fisbone", 8)) { |
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| 75 | if (os->psize < 52) |
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| 76 | return -1; |
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| 77 | |||
| 78 | target_idx = ogg_find_stream(ogg, AV_RL32(buf+12)); |
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| 79 | start_granule = AV_RL64(buf+36); |
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| 80 | if (target_idx < 0) { |
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| 81 | av_log(s, AV_LOG_WARNING, "Serial number in fisbone doesn't match any stream\n"); |
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| 82 | return 1; |
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| 83 | } |
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| 84 | os = ogg->streams + target_idx; |
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| 85 | if (os->start_granule != OGG_NOGRANULE_VALUE) { |
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| 86 | av_log(s, AV_LOG_WARNING, "Multiple fisbone for the same stream\n"); |
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| 87 | return 1; |
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| 88 | } |
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| 89 | if (start_granule != OGG_NOGRANULE_VALUE) { |
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| 90 | os->start_granule = start_granule; |
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| 91 | } |
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| 92 | } |
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| 93 | |||
| 94 | return 1; |
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| 95 | } |
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| 96 | |||
| 97 | const struct ogg_codec ff_skeleton_codec = { |
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| 98 | .magic = "fishead", |
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| 99 | .magicsize = 8, |
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| 100 | .header = skeleton_header, |
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| 101 | .nb_header = 0, |
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| 102 | }; |