yading@11: /*
yading@11:  * Copyright (C) 2010 David Conrad
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavcodec/bytestream.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "oggdec.h"
yading@11: 
yading@11: static int skeleton_header(AVFormatContext *s, int idx)
yading@11: {
yading@11:     struct ogg *ogg = s->priv_data;
yading@11:     struct ogg_stream *os = ogg->streams + idx;
yading@11:     AVStream *st = s->streams[idx];
yading@11:     uint8_t *buf = os->buf + os->pstart;
yading@11:     int version_major, version_minor;
yading@11:     int64_t start_num, start_den;
yading@11:     uint64_t start_granule;
yading@11:     int target_idx, start_time;
yading@11: 
yading@11:     strcpy(st->codec->codec_name, "skeleton");
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_DATA;
yading@11: 
yading@11:     if (os->psize < 8)
yading@11:         return -1;
yading@11: 
yading@11:     if (!strncmp(buf, "fishead", 8)) {
yading@11:         if (os->psize < 64)
yading@11:             return -1;
yading@11: 
yading@11:         version_major = AV_RL16(buf+8);
yading@11:         version_minor = AV_RL16(buf+10);
yading@11: 
yading@11:         if (version_major != 3 && version_major != 4) {
yading@11:             av_log(s, AV_LOG_WARNING, "Unknown skeleton version %d.%d\n",
yading@11:                    version_major, version_minor);
yading@11:             return -1;
yading@11:         }
yading@11: 
yading@11:         // This is the overall start time. We use it for the start time of
yading@11:         // of the skeleton stream since if left unset lavf assumes 0,
yading@11:         // which we don't want since skeleton is timeless
yading@11:         // FIXME: the real meaning of this field is "start playback at
yading@11:         // this time which can be in the middle of a packet
yading@11:         start_num = AV_RL64(buf+12);
yading@11:         start_den = AV_RL64(buf+20);
yading@11: 
yading@11:         if (start_den > 0 && start_num > 0) {
yading@11:             int base_den;
yading@11:             av_reduce(&start_time, &base_den, start_num, start_den, INT_MAX);
yading@11:             avpriv_set_pts_info(st, 64, 1, base_den);
yading@11:             os->lastpts =
yading@11:             st->start_time = start_time;
yading@11:         }
yading@11:     } else if (!strncmp(buf, "fisbone", 8)) {
yading@11:         if (os->psize < 52)
yading@11:             return -1;
yading@11: 
yading@11:         target_idx = ogg_find_stream(ogg, AV_RL32(buf+12));
yading@11:         start_granule = AV_RL64(buf+36);
yading@11:         if (os->start_granule != OGG_NOGRANULE_VALUE) {
yading@11:             avpriv_report_missing_feature(s,
yading@11:                                           "Multiple fisbone for the same stream");
yading@11:             return 1;
yading@11:         }
yading@11:         if (target_idx >= 0 && start_granule != OGG_NOGRANULE_VALUE) {
yading@11:             os->start_granule = start_granule;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     return 1;
yading@11: }
yading@11: 
yading@11: const struct ogg_codec ff_skeleton_codec = {
yading@11:     .magic = "fishead",
yading@11:     .magicsize = 8,
yading@11:     .header = skeleton_header,
yading@11:     .nb_header = 0,
yading@11: };