/* * 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.c * * Common routines for G.721 and G.723 conversions. */ #include <stdio.h>#include "g72x.h"#include "private.h"static short power2 [15] = {	1, 2, 4, 8, 0x10, 0x20, 0x40, 0x80,	0x100, 0x200, 0x400, 0x800, 0x1000, 0x2000, 0x4000} ;/* * quan() * * quantizes the input val against the table of size short integers. * It returns i if table[i - 1] <= val < table[i]. * * Using linear search for simple coding. */static int quan (int val, short *table, int size){	int		i;	for (i = 0; i < size; i++)		if (val < *table++)			break;	return (i);}/* * fmult() * * returns the integer product of the 14-bit integer "an" and * "floating point" representation (4-bit exponent, 6-bit mantessa) "srn". */static int fmult (int an, int srn){	short		anmag, anexp, anmant;	short		wanexp, wanmant;	short		retval;	anmag = (an > 0) ? an : ((-an) & 0x1FFF);	anexp = quan(anmag, power2, 15) - 6;	anmant = (anmag == 0) ? 32 :	    (anexp >= 0) ? anmag >> anexp : anmag << -anexp;	wanexp = anexp + ((srn >> 6) & 0xF) - 13;	wanmant = (anmant * (srn & 077) + 0x30) >> 4;	retval = (wanexp >= 0) ? ((wanmant << wanexp) & 0x7FFF) :	    (wanmant >> -wanexp);	return (((an ^ srn) < 0) ? -retval : retval);}/* * private_init_state() * * This routine initializes and/or resets the G72x_PRIVATE structure * pointed to by 'state_ptr'. * All the initial state values are specified in the CCITT G.721 document. */staticvoid private_init_state (G72x_STATE *state_ptr){	int		cnta;	state_ptr->yl = 34816;	state_ptr->yu = 544;	state_ptr->dms = 0;	state_ptr->dml = 0;	state_ptr->ap = 0;	for (cnta = 0; cnta < 2; cnta++) {		state_ptr->a[cnta] = 0;		state_ptr->pk[cnta] = 0;		state_ptr->sr[cnta] = 32;	}	for (cnta = 0; cnta < 6; cnta++) {		state_ptr->b[cnta] = 0;		state_ptr->dq[cnta] = 32;	}	state_ptr->td = 0;}	/* private_init_state */int g72x_reader_init (G72x_DATA *data, int codec){	G72x_STATE *pstate ;	if (sizeof (data->private) < sizeof (G72x_STATE))	{	/* This is for safety only. */		return 1 ;		} ;	memset (data, 0, sizeof (G72x_DATA)) ;		pstate = (G72x_STATE*) data->private ;	private_init_state (pstate) ;			pstate->encoder = NULL ;		switch (codec)	{	case G723_16_BITS_PER_SAMPLE : /* 2 bits per sample. */				pstate->decoder = g723_16_decoder ;				data->blocksize = G723_16_BYTES_PER_BLOCK ;				data->samplesperblock = G723_16_SAMPLES_PER_BLOCK ;				pstate->codec_bits = 2 ;				break ;						case G723_24_BITS_PER_SAMPLE : /* 3 bits per sample. */ 				pstate->decoder = g723_24_decoder ;				data->blocksize = G723_24_BYTES_PER_BLOCK ;				data->samplesperblock = G723_24_SAMPLES_PER_BLOCK ;				pstate->codec_bits = 3 ;				break ;						case G721_32_BITS_PER_SAMPLE : /* 4 bits per sample. */				pstate->decoder = g721_decoder ;				data->blocksize = G721_32_BYTES_PER_BLOCK ;				data->samplesperblock = G721_32_SAMPLES_PER_BLOCK ;				pstate->codec_bits = 4 ;				break ;						case G721_40_BITS_PER_SAMPLE : /* 5 bits per sample. */				pstate->decoder = g723_40_decoder ;				data->blocksize = G721_40_BYTES_PER_BLOCK ;				data->samplesperblock = G721_40_SAMPLES_PER_BLOCK ;				pstate->codec_bits = 5 ;				break ;						default : return 1 ;		} ;	return 0 ;}	/* g72x_reader_init */int g72x_writer_init (G72x_DATA *data, int codec){	G72x_STATE *pstate ;	if (sizeof (data->private) < sizeof (G72x_STATE))	{	/* This is for safety only. Gets optimised out. */		return 1 ;		} ;	memset (data, 0, sizeof (G72x_DATA)) ;		pstate = (G72x_STATE*) data->private ;	private_init_state (pstate) ;			pstate->decoder = NULL ;		switch (codec)	{	case G723_16_BITS_PER_SAMPLE : /* 2 bits per sample. */				pstate->encoder = g723_16_encoder ;				data->blocksize = G723_16_BYTES_PER_BLOCK ;				data->samplesperblock = G723_16_SAMPLES_PER_BLOCK ;				pstate->codec_bits = 2 ;				break ;						case G723_24_BITS_PER_SAMPLE : /* 3 bits per sample. */ 				pstate->encoder = g723_24_encoder ;				data->blocksize = G723_24_BYTES_PER_BLOCK ;				data->samplesperblock = G723_24_SAMPLES_PER_BLOCK ;				pstate->codec_bits = 3 ;				break ;						case G721_32_BITS_PER_SAMPLE : /* 4 bits per sample. */				pstate->encoder = g721_encoder ;				data->blocksize = G721_32_BYTES_PER_BLOCK ;				data->samplesperblock = G721_32_SAMPLES_PER_BLOCK ;				pstate->codec_bits = 4 ;				break ;						case G721_40_BITS_PER_SAMPLE : /* 5 bits per sample. */				pstate->encoder = g723_40_encoder ;				data->blocksize = G721_40_BYTES_PER_BLOCK ;				data->samplesperblock = G721_40_SAMPLES_PER_BLOCK ;				pstate->codec_bits = 5 ;				break ;						default : return 1 ;		} ;	return 0 ;}	/* g72x_writer_init */staticint unpack_bytes (G72x_DATA *data, int bits){	unsigned int    in_buffer = 0 ;	unsigned char	in_byte ;	int				k, in_bits = 0, bindex = 0 ;		for (k = 0 ; bindex <= data->blocksize && k < G72x_BLOCK_SIZE ; k++)	{	if (in_bits < bits) 		{	in_byte = data->block [bindex++] ;			in_buffer |= (in_byte << in_bits);			in_bits += 8;			}		data->samples [k] = in_buffer & ((1 << bits) - 1);		in_buffer >>= bits;		in_bits -= bits;		} ;			return k ;} /* unpack_bytes */int g72x_decode_block (G72x_DATA *data){	G72x_STATE *pstate ;	int	k, count ;		pstate = (G72x_STATE*) data->private ;		count = unpack_bytes (data, pstate->codec_bits) ;		for (k = 0 ; k < count ; k++)		data->samples [k] = pstate->decoder (data->samples [k], pstate) ;		return 0 ;}	/* g72x_decode_block */staticint pack_bytes (G72x_DATA *data, int bits){	unsigned int	out_buffer = 0 ;	int				k, bindex = 0, out_bits = 0 ;	unsigned char	out_byte ;	for (k = 0 ; k < G72x_BLOCK_SIZE ; k++)	{	out_buffer |= (data->samples [k] << out_bits) ;		out_bits += bits ;		if (out_bits >= 8) 		{	out_byte = out_buffer & 0xFF ;			out_bits -= 8 ;			out_buffer >>= 8 ;			data->block [bindex++] = out_byte ;			}		} ;	return bindex ;} /* pack_bytes */int g72x_encode_block (G72x_DATA *data){	G72x_STATE *pstate ;	int k, count ;	pstate = (G72x_STATE*) data->private ;		for (k = 0 ; k < data->samplesperblock ; k++)		data->samples [k] = pstate->encoder (data->samples [k], pstate) ;		count = pack_bytes (data, pstate->codec_bits) ;		return count ;}	/* g72x_encode_block *//* * predictor_zero() * * computes the estimated signal from 6-zero predictor. * */int  predictor_zero (G72x_STATE *state_ptr){	int		i;	int		sezi;	sezi = fmult(state_ptr->b[0] >> 2, state_ptr->dq[0]);	for (i = 1; i < 6; i++)			/* ACCUM */		sezi += fmult(state_ptr->b[i] >> 2, state_ptr->dq[i]);	return (sezi);}/* * predictor_pole() * * computes the estimated signal from 2-pole predictor. * */int  predictor_pole(G72x_STATE *state_ptr)