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