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Diffstat (limited to 'libs/libsndfile/src/G72x/g723_40.c')
| -rw-r--r-- | libs/libsndfile/src/G72x/g723_40.c | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/libs/libsndfile/src/G72x/g723_40.c b/libs/libsndfile/src/G72x/g723_40.c deleted file mode 100644 index 6ddb577dfb..0000000000 --- a/libs/libsndfile/src/G72x/g723_40.c +++ /dev/null @@ -1,160 +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 - */ - -/* - * g723_40.c - * - * Description: - * - * g723_40_encoder(), g723_40_decoder() - * - * These routines comprise an implementation of the CCITT G.723 40Kbps - * 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. - * - * The deviation from the bit level specification (lookup tables), - * preserves the bit level performance specifications. - * - * As outlined in the G.723 Recommendation, the algorithm is broken - * down into modules. Each section of code below is preceded by - * the name of the module which it is implementing. - * - */ - -#include "g72x.h" -#include "g72x_priv.h" - -/* - * Maps G.723_40 code word to ructeconstructed scale factor normalized log - * magnitude values. - */ -static short _dqlntab[32] = {-2048, -66, 28, 104, 169, 224, 274, 318, - 358, 395, 429, 459, 488, 514, 539, 566, - 566, 539, 514, 488, 459, 429, 395, 358, - 318, 274, 224, 169, 104, 28, -66, -2048}; - -/* Maps G.723_40 code word to log of scale factor multiplier. */ -static short _witab[32] = {448, 448, 768, 1248, 1280, 1312, 1856, 3200, - 4512, 5728, 7008, 8960, 11456, 14080, 16928, 22272, - 22272, 16928, 14080, 11456, 8960, 7008, 5728, 4512, - 3200, 1856, 1312, 1280, 1248, 768, 448, 448}; - -/* - * Maps G.723_40 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. - */ -static short _fitab[32] = {0, 0, 0, 0, 0, 0x200, 0x200, 0x200, - 0x200, 0x200, 0x400, 0x600, 0x800, 0xA00, 0xC00, 0xC00, - 0xC00, 0xC00, 0xA00, 0x800, 0x600, 0x400, 0x200, 0x200, - 0x200, 0x200, 0x200, 0, 0, 0, 0, 0}; - -static short qtab_723_40[15] = {-122, -16, 68, 139, 198, 250, 298, 339, - 378, 413, 445, 475, 502, 528, 553}; - -/* - * g723_40_encoder() - * - * Encodes a 16-bit linear PCM, A-law or u-law input sample and retuens - * the resulting 5-bit CCITT G.723 40Kbps code. - * Returns -1 if the input coding value is invalid. - */ -int g723_40_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 difference */ - - /* quantize prediction difference */ - y = step_size(state_ptr); /* adaptive quantizer step size */ - i = quantize(d, y, qtab_723_40, 15); /* i = ADPCM code */ - - dq = reconstruct(i & 0x10, _dqlntab[i], y); /* quantized diff */ - - sr = (dq < 0) ? se - (dq & 0x7FFF) : se + dq; /* reconstructed signal */ - - dqsez = sr + sez - se; /* dqsez = pole prediction diff. */ - - update(5, y, _witab[i], _fitab[i], dq, sr, dqsez, state_ptr); - - return (i); -} - -/* - * g723_40_decoder() - * - * Decodes a 5-bit CCITT G.723 40Kbps 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_40_decoder (int i, G72x_STATE *state_ptr) -{ - short sezi, sei, sez, se; /* ACCUM */ - short y ; /* MIX */ - short sr; /* ADDB */ - short dq; - short dqsez; - - i &= 0x1f; /* 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 & 0x10, _dqlntab[i], y); /* estimation diff. */ - - sr = (dq < 0) ? (se - (dq & 0x7FFF)) : (se + dq); /* reconst. signal */ - - dqsez = sr - se + sez; /* pole prediction diff. */ - - update(5, y, _witab[i], _fitab[i], dq, sr, dqsez, state_ptr); - - return (sr << 2); /* sr was of 14-bit dynamic range */ -} -/* -** Do not edit or modify anything in this comment block. -** The arch-tag line is a file identity tag for the GNU Arch -** revision control system. -** -** arch-tag: eb8d9a00-32bf-4dd2-b287-01b0336d72bf -*/ - |