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 = CODEC_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_sample = 4;
66 st->codec->bit_rate = st->codec->bits_per_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"),