96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/*
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* Copyright (C) 2010 David Conrad
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "internal.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;
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uint64_t 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 = AVMEDIA_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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int base_den;
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av_reduce(&start_time, &base_den, start_num, start_den, INT_MAX);
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avpriv_set_pts_info(st, 64, 1, base_den);
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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 (os->start_granule != OGG_NOGRANULE_VALUE) {
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av_log_missing_feature(s,
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"Multiple fisbone for the same stream", 0);
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return 1;
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}
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if (target_idx >= 0 && start_granule != OGG_NOGRANULE_VALUE) {
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os->start_granule = start_granule;
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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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.nb_header = 0,
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};
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