mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/*
|
|
* VAG demuxer
|
|
* Copyright (c) 2015 Paul B Mahol
|
|
*
|
|
* 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/channel_layout.h"
|
|
#include "avformat.h"
|
|
#include "internal.h"
|
|
|
|
static int vag_probe(AVProbeData *p)
|
|
{
|
|
if (memcmp(p->buf, "VAGp\0\0\0", 7))
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int vag_read_header(AVFormatContext *s)
|
|
{
|
|
AVStream *st;
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
avio_skip(s->pb, 4);
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->codec_id = AV_CODEC_ID_ADPCM_PSX;
|
|
st->codec->channels = 1 + (avio_rb32(s->pb) == 0x00000004);
|
|
avio_skip(s->pb, 4);
|
|
if (st->codec->channels > 1) {
|
|
st->duration = avio_rb32(s->pb);
|
|
} else {
|
|
st->duration = avio_rb32(s->pb) / 16 * 28;
|
|
}
|
|
st->codec->sample_rate = avio_rb32(s->pb);
|
|
if (st->codec->sample_rate <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
avio_seek(s->pb, 0x1000, SEEK_SET);
|
|
if (avio_rl32(s->pb) == MKTAG('V','A','G','p')) {
|
|
st->codec->block_align = 0x1000 * st->codec->channels;
|
|
avio_seek(s->pb, 0, SEEK_SET);
|
|
st->duration = st->duration / 16 * 28;
|
|
} else {
|
|
st->codec->block_align = 16 * st->codec->channels;
|
|
avio_seek(s->pb, st->codec->channels > 1 ? 0x80 : 0x30, SEEK_SET);
|
|
}
|
|
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vag_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVCodecContext *codec = s->streams[0]->codec;
|
|
|
|
return av_get_packet(s->pb, pkt, codec->block_align);
|
|
}
|
|
|
|
AVInputFormat ff_vag_demuxer = {
|
|
.name = "vag",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Sony PS2 VAG"),
|
|
.read_probe = vag_probe,
|
|
.read_header = vag_read_header,
|
|
.read_packet = vag_read_packet,
|
|
.extensions = "vag",
|
|
};
|