8e952e4d |
/*
* CRYO APC audio format demuxer
* Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
*
* 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
*/
|
f38c6c6c |
#include <string.h> |
39f0e9b8 |
#include "libavutil/channel_layout.h" |
8e952e4d |
#include "avformat.h" |
a807c682 |
#include "internal.h" |
8e952e4d |
static int apc_probe(AVProbeData *p)
{
if (!strncmp(p->buf, "CRYO_APC", 8))
return AVPROBE_SCORE_MAX;
return 0;
}
|
6e9651d1 |
static int apc_read_header(AVFormatContext *s) |
8e952e4d |
{ |
471fe57e |
AVIOContext *pb = s->pb; |
8e952e4d |
AVStream *st;
|
e63a3628 |
avio_rl32(pb); /* CRYO */
avio_rl32(pb); /* _APC */
avio_rl32(pb); /* 1.20 */ |
8e952e4d |
|
3b3bbdd3 |
st = avformat_new_stream(s, NULL); |
8e952e4d |
if (!st) |
769e10f0 |
return AVERROR(ENOMEM); |
8e952e4d |
|
72415b2a |
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
36ef5369 |
st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_APC; |
8e952e4d |
|
e63a3628 |
avio_rl32(pb); /* number of samples */
st->codec->sample_rate = avio_rl32(pb); |
8e952e4d |
/* initial predictor values for adpcm decoder */ |
9e5fa1e5 |
if (ff_get_extradata(st->codec, pb, 2 * 4) < 0)
return AVERROR(ENOMEM); |
8e952e4d |
|
39f0e9b8 |
if (avio_rl32(pb)) {
st->codec->channels = 2;
st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
} else {
st->codec->channels = 1;
st->codec->channel_layout = AV_CH_LAYOUT_MONO;
} |
8e952e4d |
|
dd1c8f3e |
st->codec->bits_per_coded_sample = 4;
st->codec->bit_rate = st->codec->bits_per_coded_sample * st->codec->channels |
8e952e4d |
* st->codec->sample_rate;
st->codec->block_align = 1;
return 0;
}
#define MAX_READ_SIZE 4096
static int apc_read_packet(AVFormatContext *s, AVPacket *pkt)
{ |
899681cd |
if (av_get_packet(s->pb, pkt, MAX_READ_SIZE) <= 0) |
6f3e0b21 |
return AVERROR(EIO); |
7effbee6 |
pkt->flags &= ~AV_PKT_FLAG_CORRUPT; |
8e952e4d |
pkt->stream_index = 0;
return 0;
}
|
66355be3 |
AVInputFormat ff_apc_demuxer = { |
dfc2c4d9 |
.name = "apc", |
6774247a |
.long_name = NULL_IF_CONFIG_SMALL("CRYO APC"), |
dfc2c4d9 |
.read_probe = apc_probe,
.read_header = apc_read_header,
.read_packet = apc_read_packet, |
8e952e4d |
}; |