mirror of https://git.videolan.org/git/ffmpeg.git
81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/*
|
|
* SVAG 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 "avformat.h"
|
|
#include "demux.h"
|
|
#include "internal.h"
|
|
|
|
static int svag_probe(const AVProbeData *p)
|
|
{
|
|
if (memcmp(p->buf, "Svag", 4))
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int svag_read_header(AVFormatContext *s)
|
|
{
|
|
unsigned size, align;
|
|
AVStream *st;
|
|
|
|
avio_skip(s->pb, 4);
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
size = avio_rl32(s->pb);
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
|
|
st->codecpar->sample_rate = avio_rl32(s->pb);
|
|
if (st->codecpar->sample_rate <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
st->codecpar->ch_layout.nb_channels = avio_rl32(s->pb);
|
|
if (st->codecpar->ch_layout.nb_channels <= 0 ||
|
|
st->codecpar->ch_layout.nb_channels > 8)
|
|
return AVERROR_INVALIDDATA;
|
|
st->duration = size / (16 * st->codecpar->ch_layout.nb_channels) * 28;
|
|
align = avio_rl32(s->pb);
|
|
if (align <= 0 || align > INT_MAX / st->codecpar->ch_layout.nb_channels)
|
|
return AVERROR_INVALIDDATA;
|
|
st->codecpar->block_align = align * st->codecpar->ch_layout.nb_channels;
|
|
avio_skip(s->pb, 0x800 - avio_tell(s->pb));
|
|
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int svag_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVCodecParameters *par = s->streams[0]->codecpar;
|
|
|
|
return av_get_packet(s->pb, pkt, par->block_align);
|
|
}
|
|
|
|
const FFInputFormat ff_svag_demuxer = {
|
|
.p.name = "svag",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("Konami PS2 SVAG"),
|
|
.p.extensions = "svag",
|
|
.read_probe = svag_probe,
|
|
.read_header = svag_read_header,
|
|
.read_packet = svag_read_packet,
|
|
};
|