X-Git-Url: https://scm.cri.ensmp.fr/git/Faustine.git/blobdiff_plain/e775f23a10c4ba37fc1a762299f52cd0d71593b7:/interpretor/libsndfile-1.0.25/src/G72x/g723_16.c..f1f94803668061f90a5ce88bf06ee72bba8e41a5:/interpretor/lib/src/libsndfile-1.0.25/src/G72x/static/gitweb.css diff --git a/interpretor/libsndfile-1.0.25/src/G72x/g723_16.c b/interpretor/libsndfile-1.0.25/src/G72x/g723_16.c deleted file mode 100644 index ae90b6c..0000000 --- a/interpretor/libsndfile-1.0.25/src/G72x/g723_16.c +++ /dev/null @@ -1,162 +0,0 @@ -/* - * 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 mrand@tamu.edu - * -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 "g72x_priv.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); -} -