ref: 7592cc985f084dbfab7f941100d1f09b33a43e22
dir: /common/libsndfile/src/G72x/g723_16.c/
/*
* 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
*/
/* 16kbps version created, used 24kbps code and changing as little as possible.
* G.726 specs are available from ITU's gopher or WWW site (http://www.itu.ch)
* If any errors are found, please contact me at [email protected]
* -Marc Randolph
*/
/*
* g723_16.c
*
* Description:
*
* g723_16_encoder(), g723_16_decoder()
*
* These routines comprise an implementation of the CCITT G.726 16 Kbps
* ADPCM coding algorithm. Essentially, this implementation is identical to
* the bit level description except for a few deviations which take advantage
* of workstation attributes, such as hardware 2's complement arithmetic.
*
*/
#include "g72x.h"
#include "private.h"
/*
* Maps G.723_16 code word to reconstructed scale factor normalized log
* magnitude values. Comes from Table 11/G.726
*/
static short _dqlntab[4] = { 116, 365, 365, 116};
/* Maps G.723_16 code word to log of scale factor multiplier.
*
* _witab[4] is actually {-22 , 439, 439, -22}, but FILTD wants it
* as WI << 5 (multiplied by 32), so we'll do that here
*/
static short _witab[4] = {-704, 14048, 14048, -704};
/*
* Maps G.723_16 code words to a set of values whose long and short
* term averages are computed and then compared to give an indication
* how stationary (steady state) the signal is.
*/
/* Comes from FUNCTF */
static short _fitab[4] = {0, 0xE00, 0xE00, 0};
/* Comes from quantizer decision level tables (Table 7/G.726)
*/
static short qtab_723_16[1] = {261};
/*
* g723_16_encoder()
*
* Encodes a linear PCM, A-law or u-law input sample and returns its 2-bit code.
* Returns -1 if invalid input coding value.
*/
int
g723_16_encoder(
int sl,
G72x_STATE *state_ptr)
{
short sei, sezi, se, sez; /* ACCUM */
short d; /* SUBTA */
short y; /* MIX */
short sr; /* ADDB */
short dqsez; /* ADDC */
short dq, i;
/* linearize input sample to 14-bit PCM */
sl >>= 2; /* sl of 14-bit dynamic range */
sezi = predictor_zero(state_ptr);
sez = sezi >> 1;
sei = sezi + predictor_pole(state_ptr);
se = sei >> 1; /* se = estimated signal */
d = sl - se; /* d = estimation diff. */
/* quantize prediction difference d */
y = step_size(state_ptr); /* quantizer step size */
i = quantize(d, y, qtab_723_16, 1); /* i = ADPCM code */
/* Since quantize() only produces a three level output
* (1, 2, or 3), we must create the fourth one on our own
*/
if (i == 3) /* i code for the zero region */
if ((d & 0x8000) == 0) /* If d > 0, i=3 isn't right... */
i = 0;
dq = reconstruct(i & 2, _dqlntab[i], y); /* quantized diff. */
sr = (dq < 0) ? se - (dq & 0x3FFF) : se + dq; /* reconstructed signal */
dqsez = sr + sez - se; /* pole prediction diff. */
update(2, y, _witab[i], _fitab[i], dq, sr, dqsez, state_ptr);
return (i);
}
/*
* g723_16_decoder()
*
* Decodes a 2-bit CCITT G.723_16 ADPCM code and returns
* the resulting 16-bit linear PCM, A-law or u-law sample value.
* -1 is returned if the output coding is unknown.
*/
int
g723_16_decoder(
int i,
G72x_STATE *state_ptr)
{
short sezi, sei, sez, se; /* ACCUM */
short y; /* MIX */
short sr; /* ADDB */
short dq;
short dqsez;
i &= 0x03; /* mask to get proper bits */
sezi = predictor_zero(state_ptr);
sez = sezi >> 1;
sei = sezi + predictor_pole(state_ptr);
se = sei >> 1; /* se = estimated signal */
y = step_size(state_ptr); /* adaptive quantizer step size */
dq = reconstruct(i & 0x02, _dqlntab[i], y); /* unquantize pred diff */
sr = (dq < 0) ? (se - (dq & 0x3FFF)) : (se + dq); /* reconst. signal */
dqsez = sr - se + sez; /* pole prediction diff. */
update(2, y, _witab[i], _fitab[i], dq, sr, dqsez, state_ptr);
/* sr was of 14-bit dynamic range */
return (sr << 2);
}