| 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 | }; |