avcodec: add a new codec_id for CRYO APC IMA ADPCM.
[libav.git] / libavformat / apc.c
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1/*
2 * CRYO APC audio format demuxer
3 * Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
4 *
2912e87a 5 * This file is part of Libav.
8e952e4d 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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.
11 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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.
16 *
17 * You should have received a copy of the GNU Lesser General Public
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
f38c6c6c 22#include <string.h>
8e952e4d 23#include "avformat.h"
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24
25static int apc_probe(AVProbeData *p)
26{
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27 if (!strncmp(p->buf, "CRYO_APC", 8))
28 return AVPROBE_SCORE_MAX;
29
30 return 0;
31}
32
33static int apc_read_header(AVFormatContext *s, AVFormatParameters *ap)
34{
ae628ec1 35 AVIOContext *pb = s->pb;
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36 AVStream *st;
37
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38 avio_rl32(pb); /* CRYO */
39 avio_rl32(pb); /* _APC */
40 avio_rl32(pb); /* 1.20 */
8e952e4d 41
3b3bbdd3 42 st = avformat_new_stream(s, NULL);
8e952e4d 43 if (!st)
769e10f0 44 return AVERROR(ENOMEM);
8e952e4d 45
72415b2a 46 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
220506d2 47 st->codec->codec_id = CODEC_ID_ADPCM_IMA_APC;
8e952e4d 48
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49 avio_rl32(pb); /* number of samples */
50 st->codec->sample_rate = avio_rl32(pb);
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51
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)
769e10f0 56 return AVERROR(ENOMEM);
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57
58 /* initial predictor values for adpcm decoder */
b7effd4e 59 avio_read(pb, st->codec->extradata, 2 * 4);
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60
61 st->codec->channels = 1;
b7effd4e 62 if (avio_rl32(pb))
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63 st->codec->channels = 2;
64
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65 st->codec->bits_per_coded_sample = 4;
66 st->codec->bit_rate = st->codec->bits_per_coded_sample * st->codec->channels
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67 * st->codec->sample_rate;
68 st->codec->block_align = 1;
69
70 return 0;
71}
72
73#define MAX_READ_SIZE 4096
74
75static int apc_read_packet(AVFormatContext *s, AVPacket *pkt)
76{
899681cd 77 if (av_get_packet(s->pb, pkt, MAX_READ_SIZE) <= 0)
6f3e0b21 78 return AVERROR(EIO);
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79 pkt->stream_index = 0;
80 return 0;
81}
82
c6610a21 83AVInputFormat ff_apc_demuxer = {
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84 .name = "apc",
85 .long_name = NULL_IF_CONFIG_SMALL("CRYO APC format"),
86 .read_probe = apc_probe,
87 .read_header = apc_read_header,
88 .read_packet = apc_read_packet,
8e952e4d 89};