0,0 → 1,110 |
/* |
* MD STUDIO audio demuxer |
* |
* Copyright (c) 2009 Benjamin Larsson |
* |
* 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 "libavutil/intreadwrite.h" |
#include "avformat.h" |
#include "pcm.h" |
|
#define AT1_SU_SIZE 212 |
|
static int aea_read_probe(AVProbeData *p) |
{ |
if (p->buf_size <= 2048+212) |
return 0; |
|
/* Magic is '00 08 00 00' in Little Endian*/ |
if (AV_RL32(p->buf)==0x800) { |
int ch, i; |
ch = p->buf[264]; |
|
if (ch != 1 && ch != 2) |
return 0; |
|
/* Check so that the redundant bsm bytes and info bytes are valid |
* the block size mode bytes have to be the same |
* the info bytes have to be the same |
*/ |
for (i = 2048; i + 211 < p->buf_size; i+= 212) { |
int bsm_s, bsm_e, inb_s, inb_e; |
bsm_s = p->buf[0]; |
inb_s = p->buf[1]; |
inb_e = p->buf[210]; |
bsm_e = p->buf[211]; |
|
if (bsm_s != bsm_e || inb_s != inb_e) |
return 0; |
} |
return AVPROBE_SCORE_MAX / 4 + 1; |
} |
return 0; |
} |
|
static int aea_read_header(AVFormatContext *s) |
{ |
AVStream *st = avformat_new_stream(s, NULL); |
if (!st) |
return AVERROR(ENOMEM); |
|
/* Parse the amount of channels and skip to pos 2048(0x800) */ |
avio_skip(s->pb, 264); |
st->codec->channels = avio_r8(s->pb); |
avio_skip(s->pb, 1783); |
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
st->codec->codec_id = AV_CODEC_ID_ATRAC1; |
st->codec->sample_rate = 44100; |
st->codec->bit_rate = 292000; |
|
if (st->codec->channels != 1 && st->codec->channels != 2) { |
av_log(s,AV_LOG_ERROR,"Channels %d not supported!\n",st->codec->channels); |
return AVERROR_INVALIDDATA; |
} |
|
st->codec->channel_layout = (st->codec->channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO; |
|
st->codec->block_align = AT1_SU_SIZE * st->codec->channels; |
return 0; |
} |
|
static int aea_read_packet(AVFormatContext *s, AVPacket *pkt) |
{ |
int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align); |
|
pkt->stream_index = 0; |
if (ret <= 0) |
return AVERROR(EIO); |
|
return ret; |
} |
|
AVInputFormat ff_aea_demuxer = { |
.name = "aea", |
.long_name = NULL_IF_CONFIG_SMALL("MD STUDIO audio"), |
.read_probe = aea_read_probe, |
.read_header = aea_read_header, |
.read_packet = aea_read_packet, |
.read_seek = ff_pcm_read_seek, |
.flags = AVFMT_GENERIC_INDEX, |
.extensions = "aea", |
}; |