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