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musx.c
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/*
* MUSX demuxer
* Copyright (c) 2016 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/avassert.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
static int musx_probe(const AVProbeData *p)
{
unsigned version;
if (AV_RB32(p->buf) != MKBETAG('M','U','S','X'))
return 0;
version = AV_RL32(p->buf + 8);
if (version != 10 &&
version != 6 &&
version != 5 &&
version != 4 &&
version != 201)
return 0;
return AVPROBE_SCORE_MAX / 5 * 2;
}
static int musx_read_header(AVFormatContext *s)
{
unsigned type, version, coding, offset;
AVStream *st;
avio_skip(s->pb, 8);
version = avio_rl32(s->pb);
if (version != 10 &&
version != 6 &&
version != 5 &&
version != 4 &&
version != 201) {
avpriv_request_sample(s, "Unsupported version: %d", version);
return AVERROR_PATCHWELCOME;
}
avio_skip(s->pb, 4);
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
if (version == 201) {
avio_skip(s->pb, 8);
offset = avio_rl32(s->pb);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
st->codecpar->channels = 2;
st->codecpar->sample_rate = 32000;
st->codecpar->block_align = 0x80 * st->codecpar->channels;
} else if (version == 10) {
type = avio_rl32(s->pb);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
offset = 0x800;
switch (type) {
case MKTAG('P', 'S', '3', '_'):
st->codecpar->channels = 2;
st->codecpar->sample_rate = 44100;
avio_skip(s->pb, 44);
coding = avio_rl32(s->pb);
if (coding == MKTAG('D', 'A', 'T', '4') ||
coding == MKTAG('D', 'A', 'T', '8')) {
avio_skip(s->pb, 4);
st->codecpar->channels = avio_rl32(s->pb);
if (st->codecpar->channels <= 0 ||
st->codecpar->channels > INT_MAX / 0x20)
return AVERROR_INVALIDDATA;
st->codecpar->sample_rate = avio_rl32(s->pb);
}
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_DAT4;
st->codecpar->block_align = 0x20 * st->codecpar->channels;
break;
case MKTAG('W', 'I', 'I', '_'):
avio_skip(s->pb, 44);
coding = avio_rl32(s->pb);
if (coding != MKTAG('D', 'A', 'T', '4') &&
coding != MKTAG('D', 'A', 'T', '8')) {
avpriv_request_sample(s, "Unsupported coding: %X", coding);
return AVERROR_PATCHWELCOME;
}
avio_skip(s->pb, 4);
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_DAT4;
st->codecpar->channels = avio_rl32(s->pb);
if (st->codecpar->channels <= 0 ||
st->codecpar->channels > INT_MAX / 0x20)
return AVERROR_INVALIDDATA;
st->codecpar->sample_rate = avio_rl32(s->pb);
st->codecpar->block_align = 0x20 * st->codecpar->channels;
break;
case MKTAG('X', 'E', '_', '_'):
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_DAT4;
st->codecpar->channels = 2;
st->codecpar->sample_rate = 32000;
st->codecpar->block_align = 0x20 * st->codecpar->channels;
break;
case MKTAG('P', 'S', 'P', '_'):
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
st->codecpar->channels = 2;
st->codecpar->sample_rate = 32768;
st->codecpar->block_align = 0x80 * st->codecpar->channels;
break;
case MKTAG('P', 'S', '2', '_'):
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
st->codecpar->channels = 2;
st->codecpar->sample_rate = 32000;
st->codecpar->block_align = 0x80 * st->codecpar->channels;
break;
default:
avpriv_request_sample(s, "Unsupported type: %X", type);
return AVERROR_PATCHWELCOME;
}
} else if (version == 6 || version == 5 || version == 4) {
type = avio_rl32(s->pb);
avio_skip(s->pb, 20);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->channels = 2;
switch (type) {
case MKTAG('G', 'C', '_', '_'):
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_DAT4;
st->codecpar->block_align = 0x20 * st->codecpar->channels;
st->codecpar->sample_rate = 32000;
offset = avio_rb32(s->pb);
break;
case MKTAG('P', 'S', '2', '_'):
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX;
st->codecpar->block_align = 0x80 * st->codecpar->channels;
st->codecpar->sample_rate = 32000;
offset = avio_rl32(s->pb);
break;
case MKTAG('X', 'B', '_', '_'):
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_DAT4;
st->codecpar->block_align = 0x20 * st->codecpar->channels;
st->codecpar->sample_rate = 44100;
offset = avio_rl32(s->pb);
break;
default:
avpriv_request_sample(s, "Unsupported type: %X", type);
return AVERROR_PATCHWELCOME;
}
} else {
av_assert0(0);
}
avio_seek(s->pb, offset, SEEK_SET);
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
return 0;
}
static int musx_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVCodecParameters *par = s->streams[0]->codecpar;
return av_get_packet(s->pb, pkt, par->block_align);
}
const AVInputFormat ff_musx_demuxer = {
.name = "musx",
.long_name = NULL_IF_CONFIG_SMALL("Eurocom MUSX"),
.read_probe = musx_probe,
.read_header = musx_read_header,
.read_packet = musx_read_packet,
.extensions = "musx",
};