mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
cea7c19cda
Those are private fields, no reason to have them exposed in a public header. Since there are some (semi-)public fields located after these, even though this section is supposed to be private, keep some dummy padding there until the next major bump to preserve ABI compatibility.
111 lines
3.4 KiB
C
111 lines
3.4 KiB
C
/*
|
|
* Creative Voice File demuxer.
|
|
* Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
|
|
*
|
|
* 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 "libavutil/intreadwrite.h"
|
|
#include "voc.h"
|
|
#include "internal.h"
|
|
|
|
static int voc_probe(const AVProbeData *p)
|
|
{
|
|
int version, check;
|
|
|
|
if (memcmp(p->buf, ff_voc_magic, sizeof(ff_voc_magic) - 1))
|
|
return 0;
|
|
version = AV_RL16(p->buf + 22);
|
|
check = AV_RL16(p->buf + 24);
|
|
if (~version + 0x1234 != check)
|
|
return 10;
|
|
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int voc_read_header(AVFormatContext *s)
|
|
{
|
|
VocDecContext *voc = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int header_size;
|
|
|
|
avio_skip(pb, 20);
|
|
header_size = avio_rl16(pb) - 22;
|
|
if (header_size != 4) {
|
|
av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size);
|
|
return AVERROR(ENOSYS);
|
|
}
|
|
avio_skip(pb, header_size);
|
|
|
|
s->ctx_flags |= AVFMTCTX_NOHEADER;
|
|
|
|
voc->remaining_size = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
if (!s->nb_streams) {
|
|
AVStream *st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
}
|
|
return ff_voc_get_packet(s, pkt, s->streams[0], 0);
|
|
}
|
|
|
|
static int voc_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t timestamp, int flags)
|
|
{
|
|
VocDecContext *voc = s->priv_data;
|
|
AVStream *st;
|
|
int index;
|
|
|
|
if (s->nb_streams < 1) {
|
|
av_log(s, AV_LOG_ERROR, "cannot seek while no stream was found yet\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
st = s->streams[stream_index];
|
|
index = av_index_search_timestamp(st, timestamp, flags);
|
|
|
|
if (index >= 0 && index < st->internal->nb_index_entries - 1) {
|
|
AVIndexEntry *e = &st->internal->index_entries[index];
|
|
avio_seek(s->pb, e->pos, SEEK_SET);
|
|
voc->pts = e->timestamp;
|
|
voc->remaining_size = e->size;
|
|
return 0;
|
|
} else if (st->internal->nb_index_entries && st->internal->index_entries[0].timestamp <= timestamp) {
|
|
AVIndexEntry *e = &st->internal->index_entries[st->internal->nb_index_entries - 1];
|
|
// prepare context for seek_frame_generic()
|
|
voc->pts = e->timestamp;
|
|
voc->remaining_size = e->size;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
AVInputFormat ff_voc_demuxer = {
|
|
.name = "voc",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Creative Voice"),
|
|
.priv_data_size = sizeof(VocDecContext),
|
|
.read_probe = voc_probe,
|
|
.read_header = voc_read_header,
|
|
.read_packet = voc_read_packet,
|
|
.read_seek = voc_read_seek,
|
|
.codec_tag = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 },
|
|
};
|