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codec_g711.h

/*
 * FILE:    codec_g711.h
 * PROGRAM: RAT
 * AUTHOR:  Orion Hodson
 *
 * Copyright (c) 1995-2001 University College London
 * All rights reserved.
 *
 * $Id: codec_g711.h,v 1.10 2001/01/08 20:29:56 ucaccsp Exp $
 */

#ifndef CODEC_G711_H
#define CODEC_G711_H

extern short    mulawtolin[256];
extern unsigned char lintomulaw[65536];

extern short    alawtolin[256];
extern unsigned char lintoalaw[8192]; 

#define s2u(x)    lintomulaw[((unsigned short)(x))]
#define u2s(x)    mulawtolin[((unsigned char)(x))]
#define s2a(x)  lintoalaw[((unsigned short)(x))>>3]
#define a2s(x)  alawtolin[((unsigned char)(x))]

struct s_coded_unit;

void g711_init(void);

uint16_t                      g711_get_formats_count (void);
const struct s_codec_format* g711_get_format (uint16_t idx);
int                          g711_encode     (uint16_t idx, 
                                              u_char *state, 
                                              sample  *in, 
                                              struct s_coded_unit *out);
int                          g711_decode     (uint16_t idx, 
                                              u_char *state, 
                                              struct s_coded_unit *in, 
                                              sample     *out);

#endif

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