www.pudn.com > g.726.rar > private.h, change:2002-11-20,size:1897b


/** 
 * 
 * $Log: private.h,v $ 
 * Revision 1.4  2002/11/20 04:29:13  robertj 
 * Included optimisations for G.711 and G.726 codecs, thanks Ted Szoczei 
 * 
 * Revision 1.1  2002/02/11 23:24:23  robertj 
 * Updated to openH323 v1.8.0 
 * 
 * Revision 1.2  2002/02/10 21:14:54  dereks 
 * Add cvs log history to head of the file. 
 * Ensure file is terminated by a newline. 
 * 
 * 
 * 
 */ 
#if !defined G726_PRIVATE 
#define G726_PRIVATE 
 
int linear2ulaw(int pcm_val); 
int ulaw2linear(int u_val); 
int linear2alaw(int pcm_val); 
int alaw2linear(int u_val); 
 
static int fmult(int an, int srn); 
int predictor_zero(	g726_state *state_ptr); 
int predictor_pole(	g726_state *state_ptr); 
int step_size(	g726_state *state_ptr); 
int quantize(	int		d,	/* Raw difference signal sample */ 
	int		y,	/* Step size multiplier */ 
	int *	table,	/* quantization table */ 
	int		size);	/* table size of short integers */ 
int reconstruct(	int		sign,	/* 0 for non-negative value */ 
	int		dqln,	/* G.72x codeword */ 
	int		y);	/* Step size multiplier */ 
void 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 */ 
	g726_state *state_ptr);	/* coder state pointer */ 
int tandem_adjust_alaw( 
	int		sr,	/* decoder output linear PCM sample */ 
	int		se,	/* predictor estimate sample */ 
	int		y,	/* quantizer step size */ 
	int		i,	/* decoder input code */ 
	int		sign, 
	int *	qtab); 
int tandem_adjust_ulaw( 
	int		sr,	/* decoder output linear PCM sample */ 
	int		se,	/* predictor estimate sample */ 
	int		y,	/* quantizer step size */ 
	int		i,	/* decoder input code */ 
	int		sign, 
	int *	qtab); 
 
#endif // G726_PRIVATE