source: downloads/openal-0.0.8/src/audioconvert/ac_adpcm.h @ 17

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Copyright 1992 by Stichting Mathematisch Centrum, Amsterdam, The
Netherlands.

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/*
 *
 * ac_adpcm.h
 *
 * This file contains prototypes and definitions for the ADPCM
 * decoders in audioconvert.
 *
 * For more information, please see ac_adpcm.c
 */
#ifndef _AC_ADPCM_H_
#define _AC_ADPCM_H_

#include "al_siteconfig.h"

#include <AL/al.h>
#include <AL/alext.h>

typedef struct adpcm_state_s {
    ALshort     valprev;        /* Previous output value */
    ALbyte      index;          /* Index into stepsize table */
} adpcm_state_t;

void ac_adpcm_coder   (short [], char [], int, adpcm_state_t *);
void ac_adpcm_decoder (char [], short [], int, adpcm_state_t *, int pos);

int msadpcm_decode(ALubyte *encoded, ALubyte *decoded, ALuint audio_len,
                           alMSADPCM_state_LOKI *dstate, int offset);

ALint MS_ADPCM_nibble(alMSADPCM_decodestate_LOKI *state,
                                        ALubyte nybble, ALshort *coeff);

int InitIMA_ADPCM(alIMAADPCM_state_LOKI *state, alWaveFMT_LOKI *format);
int IMA_ADPCM_decode_FULL(alIMAADPCM_state_LOKI *state,
                        ALubyte **audio_buf, ALuint *audio_len);
int IMA_ADPCM_decode(ALubyte *indata, ALubyte *outdata,
                ALuint len, alIMAADPCM_state_LOKI *istate, int offset);

#endif /* _AC_ADPCM_H_ */