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https://gitee.com/openharmony/third_party_ffmpeg
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5b0103590c
We can handle v4 just fine, the parts we currently use are the same for v3 and v4. v4 can in addition contain an index which we so far do not use though. Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/*
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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 "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, 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 && version_major != 4) {
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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 (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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