100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
|
/*
|
||
|
|
* AVR demuxer
|
||
|
|
* Copyright (c) 2012 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/intreadwrite.h"
|
||
|
|
#include "avformat.h"
|
||
|
|
#include "internal.h"
|
||
|
|
#include "pcm.h"
|
||
|
|
|
||
|
|
static int avr_probe(const AVProbeData *p)
|
||
|
|
{
|
||
|
|
if (AV_RL32(p->buf) != MKTAG('2', 'B', 'I', 'T'))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
if (!AV_RB16(p->buf+12) || AV_RB16(p->buf+12) > 256) // channels
|
||
|
|
return AVPROBE_SCORE_EXTENSION/2;
|
||
|
|
if (AV_RB16(p->buf+14) > 256) // bps
|
||
|
|
return AVPROBE_SCORE_EXTENSION/2;
|
||
|
|
|
||
|
|
return AVPROBE_SCORE_EXTENSION;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int avr_read_header(AVFormatContext *s)
|
||
|
|
{
|
||
|
|
uint16_t chan, sign, bps;
|
||
|
|
AVStream *st;
|
||
|
|
|
||
|
|
st = avformat_new_stream(s, NULL);
|
||
|
|
if (!st)
|
||
|
|
return AVERROR(ENOMEM);
|
||
|
|
|
||
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
||
|
|
|
||
|
|
avio_skip(s->pb, 4); // magic
|
||
|
|
avio_skip(s->pb, 8); // sample_name
|
||
|
|
|
||
|
|
chan = avio_rb16(s->pb);
|
||
|
|
if (!chan) {
|
||
|
|
st->codecpar->channels = 1;
|
||
|
|
} else if (chan == 0xFFFFu) {
|
||
|
|
st->codecpar->channels = 2;
|
||
|
|
} else {
|
||
|
|
avpriv_request_sample(s, "chan %d", chan);
|
||
|
|
return AVERROR_PATCHWELCOME;
|
||
|
|
}
|
||
|
|
|
||
|
|
st->codecpar->bits_per_coded_sample = bps = avio_rb16(s->pb);
|
||
|
|
|
||
|
|
sign = avio_rb16(s->pb);
|
||
|
|
|
||
|
|
avio_skip(s->pb, 2); // loop
|
||
|
|
avio_skip(s->pb, 2); // midi
|
||
|
|
avio_skip(s->pb, 1); // replay speed
|
||
|
|
|
||
|
|
st->codecpar->sample_rate = avio_rb24(s->pb);
|
||
|
|
avio_skip(s->pb, 4 * 3);
|
||
|
|
avio_skip(s->pb, 2 * 3);
|
||
|
|
avio_skip(s->pb, 20);
|
||
|
|
avio_skip(s->pb, 64);
|
||
|
|
|
||
|
|
st->codecpar->codec_id = ff_get_pcm_codec_id(bps, 0, 1, sign);
|
||
|
|
if (st->codecpar->codec_id == AV_CODEC_ID_NONE) {
|
||
|
|
avpriv_request_sample(s, "Bps %d and sign %d", bps, sign);
|
||
|
|
return AVERROR_PATCHWELCOME;
|
||
|
|
}
|
||
|
|
|
||
|
|
st->codecpar->block_align = bps * st->codecpar->channels / 8;
|
||
|
|
|
||
|
|
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
AVInputFormat ff_avr_demuxer = {
|
||
|
|
.name = "avr",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("AVR (Audio Visual Research)"),
|
||
|
|
.read_probe = avr_probe,
|
||
|
|
.read_header = avr_read_header,
|
||
|
|
.read_packet = ff_pcm_read_packet,
|
||
|
|
.read_seek = ff_pcm_read_seek,
|
||
|
|
.extensions = "avr",
|
||
|
|
.flags = AVFMT_GENERIC_INDEX,
|
||
|
|
};
|