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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_LIBPCM_PCM_COMMON_H
#define CODEC_LIBPCM_PCM_COMMON_H
#include <sys/types.h>
#include <stdbool.h>
#include <inttypes.h>
/* decoded pcm sample depth (sample 28bit + sign 1bit) */
#define PCM_OUTPUT_DEPTH 29
/* 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)
/* Macro that clipping data */
#define CLIP(data, min, max) \
if ((data) > (max)) data = max; \
else if ((data) < (min)) data = min;
/* nums of msadpcm coeffs
* In many case, nNumCoef is 7.
* Depending upon the encoder, as for this value there is a possibility
* of increasing more.
* If you found the file where this value exceeds 7, please report.
*/
#define MSADPCM_NUM_COEFF 7
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;
/* the following values are format speciffic parameters */
/* microsoft adpcm: aCoeff */
int16_t coeffs[MSADPCM_NUM_COEFF][2];
};
struct pcm_pos {
uint32_t pos;
uint32_t samples;
};
struct pcm_codec {
/*
* sets the format speciffic RIFF/AIFF header information and checks the pcm_format.
*
* [In/Out] format
* the structure which supplies RIFF/AIFF header information.
*
* return
* true: RIFF/AIFF header check OK
* false: RIFF/AIFF header check NG
*/
bool (*set_format)(struct pcm_format *format);
/*
* get seek position
*
* [In] seek_time
* seek time [ms]
*
* [In] read_buffer
* the function which reads the data from the file (chunksize bytes read).
*
* return
* position after the seeking.
*/
struct pcm_pos *(*get_seek_pos)(long seek_time,
uint8_t *(*read_buffer)(size_t *realsize));
/*
* decode wave data.
*
* [In] inbuf
* the start pointer of wave data buffer.
*
* [In] inbufsize
* wave data buffer size (bytes).
*
* [Out] outbuf
* the start pointer of the buffer which supplies decoded pcm data.
*
* [Out] outbufcount
* decoded pcm data count.
*
* return
* CODEC_OK: decode succeed.
* CODEC_ERROR: decode failure.
*/
int (*decode)(const uint8_t *inbuf, size_t inbufsize,
int32_t *outbuf, int *outbufcount);
};
struct pcm_entry {
uint32_t format_tag;
const struct pcm_codec *(*get_codec)(void);
};
#endif
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