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87 lines
2.8 KiB
87 lines
2.8 KiB
/* |
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* Copyright (C) 2010 David Conrad |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavcodec/bytestream.h" |
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#include "avformat.h" |
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#include "oggdec.h" |
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static int skeleton_header(AVFormatContext *s, int idx) |
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{ |
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struct ogg *ogg = s->priv_data; |
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struct ogg_stream *os = ogg->streams + idx; |
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AVStream *st = s->streams[idx]; |
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uint8_t *buf = os->buf + os->pstart; |
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int version_major, version_minor; |
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int64_t start_num, start_den, start_granule; |
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int target_idx, start_time; |
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strcpy(st->codec->codec_name, "skeleton"); |
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st->codec->codec_type = CODEC_TYPE_DATA; |
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if (os->psize < 8) |
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return -1; |
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if (!strncmp(buf, "fishead", 8)) { |
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if (os->psize < 64) |
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return -1; |
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version_major = AV_RL16(buf+8); |
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version_minor = AV_RL16(buf+10); |
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if (version_major != 3) { |
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av_log(s, AV_LOG_WARNING, "Unknown skeleton version %d.%d\n", |
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version_major, version_minor); |
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return -1; |
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} |
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// This is the overall start time. We use it for the start time of |
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// of the skeleton stream since if left unset lavf assumes 0, |
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// which we don't want since skeleton is timeless |
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// FIXME: the real meaning of this field is "start playback at |
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// this time which can be in the middle of a packet |
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start_num = AV_RL64(buf+12); |
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start_den = AV_RL64(buf+20); |
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if (start_den) { |
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av_reduce(&start_time, &st->time_base.den, start_num, start_den, INT_MAX); |
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st->time_base.num = 1; |
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os->lastpts = |
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st->start_time = start_time; |
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} |
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} else if (!strncmp(buf, "fisbone", 8)) { |
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if (os->psize < 52) |
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return -1; |
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target_idx = ogg_find_stream(ogg, AV_RL32(buf+12)); |
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start_granule = AV_RL64(buf+36); |
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if (target_idx >= 0 && start_granule != -1) { |
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ogg->streams[target_idx].lastpts = |
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s->streams[target_idx]->start_time = ogg_gptopts(s, target_idx, start_granule, NULL); |
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} |
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} |
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return 1; |
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} |
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const struct ogg_codec ff_skeleton_codec = { |
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.magic = "fishead", |
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.magicsize = 8, |
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.header = skeleton_header, |
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};
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