You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
157 lines
4.7 KiB
157 lines
4.7 KiB
/* 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.
|
|
*
|
|
* SUN SOURCE CODE IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING
|
|
* THE WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
|
|
*
|
|
* Sun source code is provided with no support and without any obligation on
|
|
* the part of Sun Microsystems, Inc. to assist in its use, correction,
|
|
* modification or enhancement.
|
|
*
|
|
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
|
|
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY THIS SOFTWARE
|
|
* OR ANY PART THEREOF.
|
|
*
|
|
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
|
|
* or profits or other special, indirect and consequential damages, even if
|
|
* Sun has been advised of the possibility of such damages.
|
|
*
|
|
* Sun Microsystems, Inc.
|
|
* 2550 Garcia Avenue
|
|
* Mountain View, California 94043
|
|
*/
|
|
|
|
/*
|
|
* g72x.h
|
|
*
|
|
* Header file for CCITT conversion routines.
|
|
*
|
|
*/
|
|
#ifndef _G72X_H
|
|
#define _G72X_H
|
|
|
|
/* aliases */
|
|
#define g721_decoder lsx_g721_decoder
|
|
#define g721_encoder lsx_g721_encoder
|
|
#define g723_24_decoder lsx_g723_24_decoder
|
|
#define g723_24_encoder lsx_g723_24_encoder
|
|
#define g723_40_decoder lsx_g723_40_decoder
|
|
#define g723_40_encoder lsx_g723_40_encoder
|
|
#define g72x_init_state lsx_g72x_init_state
|
|
#define predictor_pole lsx_g72x_predictor_pole
|
|
#define predictor_zero lsx_g72x_predictor_zero
|
|
#define quantize lsx_g72x_quantize
|
|
#define reconstruct lsx_g72x_reconstruct
|
|
#define step_size lsx_g72x_step_size
|
|
#define tandem_adjust_alaw lsx_g72x_tandem_adjust_alaw
|
|
#define tandem_adjust_ulaw lsx_g72x_tandem_adjust_ulaw
|
|
#define update lsx_g72x_update
|
|
|
|
#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_16_encoder(
|
|
int sample,
|
|
int in_coding,
|
|
struct g72x_state *state_ptr);
|
|
extern int g723_16_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);
|
|
|
|
int predictor_zero(struct g72x_state *state_ptr);
|
|
int predictor_pole(struct g72x_state *state_ptr);
|
|
int step_size(struct g72x_state *state_ptr);
|
|
int quantize(int d,
|
|
int y,
|
|
short const *table,
|
|
int size);
|
|
int reconstruct(int sign,
|
|
int dqln,
|
|
int y);
|
|
void update(int code_size,
|
|
int y,
|
|
int wi,
|
|
int fi,
|
|
int dq,
|
|
int sr,
|
|
int dqsez,
|
|
struct g72x_state *state_ptr);
|
|
int tandem_adjust_alaw(int sr,
|
|
int se,
|
|
int y,
|
|
int i,
|
|
int sign,
|
|
short const *qtab);
|
|
int tandem_adjust_ulaw(int sr,
|
|
int se,
|
|
int y,
|
|
int i,
|
|
int sign,
|
|
short const *qtab);
|
|
#endif /* !_G72X_H */
|
|
|