ref: 277210ab0b851fe9d87806db2777852374e4bcac
dir: /src/speech/g72x.h/
/*************************************************************************/
/* */
/* Language Technologies Institute */
/* Carnegie Mellon University */
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/*************************************************************************/
/* Author: Alan W Black (awb@cs.cmu.edu) */
/* Date: March 2001 */
/*************************************************************************/
/* */
/* Minor fixes to make it properly ansi and fit into cst */
/* */
/*************************************************************************/
/*
* This source code is a product of Sun Microsystems, Inc. and is provided
* for unrestricted use. Users may copy or modify this source code without
* charge.
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/*
* g72x.h
*
* Header file for CCITT conversion routines.
*
*/
#ifndef _G72X_H
#define _G72X_H
#include "cst_wave.h"
#define AUDIO_ENCODING_ULAW (1) /* ISDN u-law */
#define AUDIO_ENCODING_ALAW (2) /* ISDN A-law */
#define AUDIO_ENCODING_LINEAR (3) /* PCM 2's-complement (0-center) */
/*
* The following is the definition of the state structure
* used by the G.721/G.723 encoder and decoder to preserve their internal
* state between successive calls. The meanings of the majority
* of the state structure fields are explained in detail in the
* CCITT Recommendation G.721. The field names are essentially indentical
* to variable names in the bit level description of the coding algorithm
* included in this Recommendation.
*/
struct g72x_state {
long yl; /* Locked or steady state step size multiplier. */
short yu; /* Unlocked or non-steady state step size multiplier. */
short dms; /* Short term energy estimate. */
short dml; /* Long term energy estimate. */
short ap; /* Linear weighting coefficient of 'yl' and 'yu'. */
short a[2]; /* Coefficients of pole portion of prediction filter. */
short b[6]; /* Coefficients of zero portion of prediction filter. */
short pk[2]; /*
* Signs of previous two samples of a partially
* reconstructed signal.
*/
short dq[6]; /*
* Previous 6 samples of the quantized difference
* signal represented in an internal floating point
* format.
*/
short sr[2]; /*
* Previous 2 samples of the quantized difference
* signal represented in an internal floating point
* format.
*/
char td; /* delayed tone detect, new in 1988 version */
};
/* External function definitions. */
extern void g72x_init_state(struct g72x_state *);
extern int g721_encoder(
int sample,
int in_coding,
struct g72x_state *state_ptr);
extern int g721_decoder(
int code,
int out_coding,
struct g72x_state *state_ptr);
extern int g723_24_encoder(
int sample,
int in_coding,
struct g72x_state *state_ptr);
extern int g723_24_decoder(
int code,
int out_coding,
struct g72x_state *state_ptr);
extern int g723_40_encoder(
int sample,
int in_coding,
struct g72x_state *state_ptr);
extern int g723_40_decoder(
int code,
int out_coding,
struct g72x_state *state_ptr);
/* Internal functions */
int g72x_predictor_zero(struct g72x_state *state_ptr);
int g72x_predictor_pole(struct g72x_state *state_ptr);
int g72x_step_size(struct g72x_state *state_ptr);
int
g72x_quantize(
int d, /* Raw difference signal sample */
int y, /* Step size multiplier */
short *table, /* quantization table */
int size); /* table size of short integers */
int
g72x_reconstruct(
int sign, /* 0 for non-negative value */
int dqln, /* G.72x codeword */
int y); /* Step size multiplier */
void
g72x_update(
int code_size, /* distinguish 723_40 with others */
int y, /* quantizer step size */
int wi, /* scale factor multiplier */
int fi, /* for long/short term energies */
int dq, /* quantized prediction difference */
int sr, /* reconstructed signal */
int dqsez, /* difference from 2-pole predictor */
struct g72x_state *state_ptr); /* coder state pointer */
#endif /* !_G72X_H */