2
* CRYO APC audio format demuxer
3
* Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
5
* This file is part of FFmpeg.
7
* FFmpeg is free software; you can redistribute it and/or
8
* modify it under the terms of the GNU Lesser General Public
9
* License as published by the Free Software Foundation; either
10
* version 2.1 of the License, or (at your option) any later version.
12
* FFmpeg is distributed in the hope that it will be useful,
13
* but WITHOUT ANY WARRANTY; without even the implied warranty of
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15
* Lesser General Public License for more details.
17
* You should have received a copy of the GNU Lesser General Public
18
* License along with FFmpeg; if not, write to the Free Software
19
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25
static int apc_probe(AVProbeData *p)
27
if (!strncmp(p->buf, "CRYO_APC", 8))
28
return AVPROBE_SCORE_MAX;
33
static int apc_read_header(AVFormatContext *s, AVFormatParameters *ap)
35
ByteIOContext *pb = s->pb;
38
get_le32(pb); /* CRYO */
39
get_le32(pb); /* _APC */
40
get_le32(pb); /* 1.20 */
42
st = av_new_stream(s, 0);
44
return AVERROR(ENOMEM);
46
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
47
st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS;
49
get_le32(pb); /* number of samples */
50
st->codec->sample_rate = get_le32(pb);
52
st->codec->extradata_size = 2 * 4;
53
st->codec->extradata = av_malloc(st->codec->extradata_size +
54
FF_INPUT_BUFFER_PADDING_SIZE);
55
if (!st->codec->extradata)
56
return AVERROR(ENOMEM);
58
/* initial predictor values for adpcm decoder */
59
get_buffer(pb, st->codec->extradata, 2 * 4);
61
st->codec->channels = 1;
63
st->codec->channels = 2;
65
st->codec->bits_per_coded_sample = 4;
66
st->codec->bit_rate = st->codec->bits_per_coded_sample * st->codec->channels
67
* st->codec->sample_rate;
68
st->codec->block_align = 1;
73
#define MAX_READ_SIZE 4096
75
static int apc_read_packet(AVFormatContext *s, AVPacket *pkt)
77
if (av_get_packet(s->pb, pkt, MAX_READ_SIZE) <= 0)
79
pkt->stream_index = 0;
83
AVInputFormat apc_demuxer = {
85
NULL_IF_CONFIG_SMALL("CRYO APC format"),