121 lines
3.2 KiB
C
121 lines
3.2 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2009 Yoshihisa Uchida
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef CODEC_LIBPCMS_PCM_COMMON_H
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#define CODEC_LIBPCMS_PCM_COMMON_H
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#include <sys/types.h>
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#include <stdbool.h>
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#include <inttypes.h>
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/*
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* PCM_CHUNK_SIZE has the size only of storing the sample at 1/50 seconds.
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* But it might not be 1/50 seconds according to the format.
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* Please confirm the source file of each format.
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*/
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#define PCM_CHUNK_SIZE (4096*2)
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/* Macro that sign extends an unsigned byte */
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#define SE(x) ((int32_t)((int8_t)(x)))
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/* Macro that shift to -0x80. (0 .. 127 to -128 .. -1, 128 .. 255 to 0 .. 127) */
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#define SFT(x) ((int32_t)x-0x80)
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struct pcm_format {
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/*
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* RIFF: wFormatTag (in 'fmt ' chunk)
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* AIFF: compressionType (in 'COMM' chunk)
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*/
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uint32_t formattag;
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/*
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* RIFF: wChannels (in 'fmt ' chunk)
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* AIFF: numChannels (in 'COMM' chunk)
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*/
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uint16_t channels;
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/*
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* RIFF: dwSamplesPerSec (in 'fmt ' chunk)
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* AIFF: sampleRate (in 'COMM' chunk)
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*/
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uint32_t samplespersec;
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/* RIFF: dwAvgBytesPerSec (in 'fmt ' chunk) */
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uint32_t avgbytespersec;
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/*
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* RIFF: wBlockAlign (in 'fmt ' chunk)
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* AIFF: blockSize (in 'SSND' chunk)
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*/
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uint16_t blockalign;
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/*
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* RIFF: wBitsPerSample (in 'fmt ' chunk)
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* AIFF: sampleSize (in 'COMM' chunk)
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*/
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uint16_t bitspersample;
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/* RIFF: wSize (in 'fmt ' chunk) */
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uint16_t size;
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/* RIFF: dSamplesPerBlock (in 'fmt ' chunk) */
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uint16_t samplesperblock;
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/* RIFF: wTotalSamples (in 'fact' chunk) */
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uint16_t totalsamples;
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/* the following values are not RIFF/AIFF chunk values */
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/* bytes per sample */
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int bytespersample;
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/* chunk size */
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long chunksize;
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/* data size */
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uint32_t numbytes;
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/*
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* data endian
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* true: little endian, false: big endian
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*/
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bool is_little_endian;
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/*
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* data signess
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* true: signed, false: unsigned
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*/
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bool is_signed;
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};
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struct pcm_codec {
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bool (*set_format)(struct pcm_format *format, const unsigned char *fmtpos);
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uint32_t (*get_seek_pos)(long seek_time);
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int (*decode)(const uint8_t *inbuf, size_t inbufsize,
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int32_t *outbuf, int *outbufsize);
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};
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struct pcm_entry {
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uint32_t format_tag;
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const struct pcm_codec *(*get_codec)(void);
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};
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#endif
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