234 lines
7.1 KiB
C
234 lines
7.1 KiB
C
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/*
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$Log$
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Revision 1.15 2004/06/26 03:50:14 markster
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Merge source cleanups (bug #1911)
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Revision 1.14 2003/02/12 13:59:14 matteo
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mer feb 12 14:56:57 CET 2003
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Revision 1.1.1.1 2003/02/12 13:59:14 matteo
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mer feb 12 14:56:57 CET 2003
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Revision 1.2 2000/01/05 08:20:39 markster
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Some OSS fixes and a few lpc changes to make it actually work
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* Revision 1.2 1996/08/20 20:20:24 jaf
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* Removed all static local variables that were SAVE'd in the Fortran
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* code, and put them in struct lpc10_encoder_state that is passed as an
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* argument.
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*
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* Revision 1.1 1996/08/19 22:40:31 jaf
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* Initial revision
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*
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*/
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/* -- translated by f2c (version 19951025).
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You must link the resulting object file with the libraries:
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-lf2c -lm (in that order)
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*/
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#include <stdlib.h>
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#include "f2c.h"
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/* *********************************************************************** */
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/* CHANL Version 49 */
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/* $Log$
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* Revision 1.15 2004/06/26 03:50:14 markster
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* Merge source cleanups (bug #1911)
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*
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* Revision 1.14 2003/02/12 13:59:14 matteo
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* mer feb 12 14:56:57 CET 2003
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*
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* Revision 1.1.1.1 2003/02/12 13:59:14 matteo
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* mer feb 12 14:56:57 CET 2003
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*
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* Revision 1.2 2000/01/05 08:20:39 markster
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* Some OSS fixes and a few lpc changes to make it actually work
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*
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* Revision 1.2 1996/08/20 20:20:24 jaf
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* Removed all static local variables that were SAVE'd in the Fortran
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* code, and put them in struct lpc10_encoder_state that is passed as an
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* argument.
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*
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* Revision 1.1 1996/08/19 22:40:31 jaf
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* Initial revision
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* */
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/* Revision 1.3 1996/03/21 15:14:57 jaf */
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/* Added comments about which indices of argument arrays are read or */
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/* written, and about the one bit of local state in CHANWR. CHANRD */
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/* has no local state. */
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/* Revision 1.2 1996/03/13 18:55:10 jaf */
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/* Comments added explaining which of the local variables of this */
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/* subroutine need to be saved from one invocation to the next, and which */
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/* do not. */
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/* Revision 1.1 1996/02/07 14:43:31 jaf */
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/* Initial revision */
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/* *********************************************************************** */
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/* CHANWR: */
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/* Place quantized parameters into bitstream */
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/* Input: */
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/* ORDER - Number of reflection coefficients (not really variable) */
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/* IPITV - Quantized pitch/voicing parameter */
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/* IRMS - Quantized energy parameter */
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/* IRC - Quantized reflection coefficients */
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/* Indices 1 through ORDER read. */
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/* Output: */
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/* IBITS - Serial bitstream */
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/* Indices 1 through 54 written. */
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/* Bit 54, the SYNC bit, alternates from one call to the next. */
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/* Subroutine CHANWR maintains one bit of local state from one call to */
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/* the next, in the variable ISYNC. I believe that this one bit is only */
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/* intended to allow a receiver to resynchronize its interpretation of */
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/* the bit stream, by looking for which of the 54 bits alternates every */
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/* frame time. This is just a simple framing mechanism that is not */
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/* useful when other, higher overhead framing mechanisms are used to */
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/* transmit the coded frames. */
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/* I'm not going to make an entry to reinitialize this bit, since it */
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/* doesn't help a receiver much to know whether the first sync bit is a 0 */
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/* or a 1. It needs to examine several frames in sequence to have */
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/* reasonably good assurance that its framing is correct. */
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/* CHANRD: */
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/* Reconstruct parameters from bitstream */
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/* Input: */
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/* ORDER - Number of reflection coefficients (not really variable) */
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/* IBITS - Serial bitstream */
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/* Indices 1 through 53 read (SYNC bit is ignored). */
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/* Output: */
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/* IPITV - Quantized pitch/voicing parameter */
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/* IRMS - Quantized energy parameter */
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/* IRC - Quantized reflection coefficients */
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/* Indices 1 through ORDER written */
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/* Entry CHANRD has no local state. */
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/* IBITS is 54 bits of LPC data ordered as follows: */
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/* R1-0, R2-0, R3-0, P-0, A-0, */
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/* R1-1, R2-1, R3-1, P-1, A-1, */
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/* R1-2, R4-0, R3-2, A-2, P-2, R4-1, */
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/* R1-3, R2-2, R3-3, R4-2, A-3, */
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/* R1-4, R2-3, R3-4, R4-3, A-4, */
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/* P-3, R2-4, R7-0, R8-0, P-4, R4-4, */
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/* R5-0, R6-0, R7-1,R10-0, R8-1, */
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/* R5-1, R6-1, R7-2, R9-0, P-5, */
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/* R5-2, R6-2,R10-1, R8-2, P-6, R9-1, */
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/* R5-3, R6-3, R7-3, R9-2, R8-3, SYNC */
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/* Subroutine */ int chanwr_0_(int n__, integer *order, integer *ipitv,
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integer *irms, integer *irc, integer *ibits,
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struct lpc10_encoder_state *st)
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{
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/* Initialized data */
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integer *isync;
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static integer bit[10] = { 2,4,8,8,8,8,16,16,16,16 };
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static integer iblist[53] = { 13,12,11,1,2,13,12,11,1,2,13,10,11,2,1,10,
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13,12,11,10,2,13,12,11,10,2,1,12,7,6,1,10,9,8,7,4,6,9,8,7,5,1,9,8,
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4,6,1,5,9,8,7,5,6 };
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/* System generated locals */
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integer i__1;
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/* Local variables */
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integer itab[13], i__;
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/* Arguments */
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/* Parameters/constants */
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/* These arrays are not Fortran PARAMETER's, but they are defined */
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/* by DATA statements below, and their contents are never altered.
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*/
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/* Local variables that need not be saved */
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/* Local state */
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/* ISYNC is only used by CHANWR, not by ENTRY CHANRD. */
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/* Parameter adjustments */
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--irc;
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--ibits;
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/* Function Body */
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switch(n__) {
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case 1: goto L_chanrd;
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}
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isync = &(st->isync);
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/* ***********************************************************************
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*/
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/* Place quantized parameters into bitstream */
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/* ***********************************************************************
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*/
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/* Place parameters into ITAB */
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itab[0] = *ipitv;
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itab[1] = *irms;
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itab[2] = 0;
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i__1 = *order;
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for (i__ = 1; i__ <= i__1; ++i__) {
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itab[i__ + 2] = irc[*order + 1 - i__] & 32767;
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}
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/* Put 54 bits into IBITS array */
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for (i__ = 1; i__ <= 53; ++i__) {
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ibits[i__] = itab[iblist[i__ - 1] - 1] & 1;
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itab[iblist[i__ - 1] - 1] /= 2;
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}
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ibits[54] = *isync & 1;
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*isync = 1 - *isync;
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return 0;
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/* ***********************************************************************
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*/
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/* Reconstruct parameters from bitstream */
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/* ***********************************************************************
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*/
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L_chanrd:
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/* Reconstruct ITAB */
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for (i__ = 1; i__ <= 13; ++i__) {
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itab[i__ - 1] = 0;
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}
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for (i__ = 1; i__ <= 53; ++i__) {
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itab[iblist[54 - i__ - 1] - 1] = (itab[iblist[54 - i__ - 1] - 1] << 1)
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+ ibits[54 - i__];
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}
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/* Sign extend RC's */
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i__1 = *order;
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for (i__ = 1; i__ <= i__1; ++i__) {
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if ((itab[i__ + 2] & bit[i__ - 1]) != 0) {
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itab[i__ + 2] -= bit[i__ - 1] << 1;
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}
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}
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/* Restore variables */
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*ipitv = itab[0];
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*irms = itab[1];
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i__1 = *order;
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for (i__ = 1; i__ <= i__1; ++i__) {
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irc[i__] = itab[*order + 4 - i__ - 1];
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}
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return 0;
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} /* chanwr_ */
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/* Subroutine */ int chanwr_(integer *order, integer *ipitv, integer *irms,
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integer *irc, integer *ibits, struct lpc10_encoder_state *st)
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{
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return chanwr_0_(0, order, ipitv, irms, irc, ibits, st);
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}
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/* Subroutine */ int chanrd_(integer *order, integer *ipitv, integer *irms,
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integer *irc, integer *ibits)
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{
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return chanwr_0_(1, order, ipitv, irms, irc, ibits, NULL);
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}
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