626 lines
20 KiB
C
626 lines
20 KiB
C
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/*
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$Log$
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Revision 1.16 2004/06/26 03:50:14 markster
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Merge source cleanups (bug #1911)
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Revision 1.15 2003/09/19 01:20:22 markster
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Code cleanups (bug #66)
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Revision 1.2 2003/09/19 01:20:22 markster
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Code cleanups (bug #66)
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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 20:22:39 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_decoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_decoder_state().
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*
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* Revision 1.1 1996/08/19 22:32:38 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 "f2c.h"
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#ifdef P_R_O_T_O_T_Y_P_E_S
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extern int decode_(integer *ipitv, integer *irms, integer *irc, integer *voice, integer *pitch, real *rms, real *rc, struct lpc10_decoder_state *st);
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/* comlen contrl_ 12 */
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/*:ref: ham84_ 14 3 4 4 4 */
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/*:ref: median_ 4 3 4 4 4 */
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#endif
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/* Common Block Declarations */
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extern struct {
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integer order, lframe;
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logical corrp;
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} contrl_;
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#define contrl_1 contrl_
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/* Table of constant values */
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static integer c__2 = 2;
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/* ***************************************************************** */
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/* DECODE Version 54 */
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/* $Log$
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* Revision 1.16 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 1.15 2003/09/19 01:20:22 markster
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* Code cleanups (bug #66)
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*
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* Revision 1.2 2003/09/19 01:20:22 markster
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* Code cleanups (bug #66)
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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 20:22:39 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_decoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_decoder_state().
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*
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* Revision 1.1 1996/08/19 22:32:38 jaf
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* Initial revision
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* */
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/* Revision 1.5 1996/05/23 20:06:03 jaf */
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/* Assigned PITCH a "default" value on the first call, since otherwise it */
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/* would be left uninitialized. */
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/* Revision 1.4 1996/03/26 19:35:18 jaf */
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/* Commented out trace statements. */
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/* Revision 1.3 1996/03/21 21:10:50 jaf */
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/* Added entry INITDECODE to reinitialize the local state of subroutine */
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/* DECODE. */
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/* Revision 1.2 1996/03/21 21:04:50 jaf */
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/* Determined which local variables should be saved from one invocation */
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/* to the next, and guessed initial values for some that should have been */
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/* saved, but weren't given initial values. Many of the arrays are */
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/* "constants", and many local variables are only used if the "global" */
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/* variable CORRP is .TRUE. */
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/* Added comments explaining which indices of array arguments are read or */
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/* written. */
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/* Revision 1.1 1996/02/12 03:21:10 jaf */
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/* Initial revision */
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/* ***************************************************************** */
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/* This subroutine provides error correction and decoding */
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/* for all LPC parameters */
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/* Input: */
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/* IPITV - Index value of pitch */
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/* IRMS - Coded Energy */
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/* CORRP - Error correction: */
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/* If FALSE, parameters are decoded directly with no delay. If TRUE, */
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/* most important parameter bits are protected by Hamming code and */
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/* median smoothed. This requires an additional frame of delay. */
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/* Input/Output: */
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/* IRC - Coded Reflection Coefficients */
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/* Indices 1 through ORDER always read, then written. */
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/* Output: */
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/* VOICE - Half frame voicing decisions */
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/* Indices 1 through 2 written. */
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/* PITCH - Decoded pitch */
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/* RMS - Energy */
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/* RC - Reflection coefficients */
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/* Indices 1 through ORDER written. */
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/* NOTE: Zero RC's should be done more directly, but this would affect */
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/* coded parameter printout. */
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/* This subroutine maintains local state from one call to the next. If */
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/* you want to switch to using a new audio stream for this filter, or */
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/* reinitialize its state for any other reason, call the ENTRY */
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/* INITDECODE. */
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/* Subroutine */ int decode_(integer *ipitv, integer *irms,
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integer *irc, integer *voice, integer *pitch, real *rms, real *rc,
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struct lpc10_decoder_state *st)
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{
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/* Initialized data */
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logical *first;
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static integer ethrs = 2048;
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static integer ethrs1 = 128;
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static integer ethrs2 = 1024;
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static integer ethrs3 = 2048;
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static integer ivtab[32] = { 24960,24960,24960,24960,25480,25480,25483,
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25480,16640,1560,1560,1560,16640,1816,1563,1560,24960,24960,24859,
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24856,26001,25881,25915,25913,1560,1560,7800,3640,1561,1561,3643,
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3641 };
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static real corth[32] /* was [4][8] */ = { 32767.f,10.f,5.f,0.f,
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32767.f,8.f,4.f,0.f,32.f,6.4f,3.2f,0.f,32.f,6.4f,3.2f,0.f,32.f,
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11.2f,6.4f,0.f,32.f,11.2f,6.4f,0.f,16.f,5.6f,3.2f,0.f,16.f,5.6f,
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3.2f,0.f };
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static integer detau[128] = { 0,0,0,3,0,3,3,31,0,3,3,21,3,3,29,30,0,3,3,
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20,3,25,27,26,3,23,58,22,3,24,28,3,0,3,3,3,3,39,33,32,3,37,35,36,
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3,38,34,3,3,42,46,44,50,40,48,3,54,3,56,3,52,3,3,1,0,3,3,108,3,78,
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100,104,3,84,92,88,156,80,96,3,3,74,70,72,66,76,68,3,62,3,60,3,64,
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3,3,1,3,116,132,112,148,152,3,3,140,3,136,3,144,3,3,1,124,120,128,
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3,3,3,3,1,3,3,3,1,3,1,1,1 };
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static integer rmst[64] = { 1024,936,856,784,718,656,600,550,502,460,420,
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384,352,328,294,270,246,226,206,188,172,158,144,132,120,110,102,
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92,84,78,70,64,60,54,50,46,42,38,34,32,30,26,24,22,20,18,17,16,15,
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14,13,12,11,10,9,8,7,6,5,4,3,2,1,0 };
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static integer detab7[32] = { 4,11,18,25,32,39,46,53,60,66,72,77,82,87,92,
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96,101,104,108,111,114,115,117,119,121,122,123,124,125,126,127,
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127 };
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static real descl[8] = { .6953f,.625f,.5781f,.5469f,.5312f,.5391f,.4688f,
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.3828f };
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integer *ivp2h;
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static integer deadd[8] = { 1152,-2816,-1536,-3584,-1280,-2432,768,-1920 }
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;
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static integer qb[8] = { 511,511,1023,1023,1023,1023,2047,4095 };
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static integer nbit[10] = { 8,8,5,5,4,4,4,4,3,2 };
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static integer zrc[10] = { 0,0,0,0,0,3,0,2,0,0 };
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static integer bit[5] = { 2,4,8,16,32 };
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integer *iovoic;
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integer *iavgp;
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integer *iptold;
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integer *erate;
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integer *drc;
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integer *dpit;
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integer *drms;
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/* System generated locals */
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integer i__1, i__2;
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/* Builtin functions */
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integer pow_ii(integer *, integer *);
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/* Local variables */
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extern /* Subroutine */ int ham84_(integer *, integer *, integer *);
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integer ipit, iout, i__, icorf, index, ivoic, ixcor, i1, i2, i4;
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extern integer median_(integer *, integer *, integer *);
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integer ishift, errcnt, lsb;
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/* $Log$
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* Revision 1.16 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 1.15 2003/09/19 01:20:22 markster
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* Code cleanups (bug #66)
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*
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* Revision 1.2 2003/09/19 01:20:22 markster
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* Code cleanups (bug #66)
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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 20:22:39 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_decoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_decoder_state().
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*
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* Revision 1.1 1996/08/19 22:32:38 jaf
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* Initial revision
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* */
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/* Revision 1.3 1996/03/29 22:03:47 jaf */
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/* Removed definitions for any constants that were no longer used. */
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/* Revision 1.2 1996/03/26 19:34:33 jaf */
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/* Added comments indicating which constants are not needed in an */
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/* application that uses the LPC-10 coder. */
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/* Revision 1.1 1996/02/07 14:43:51 jaf */
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/* Initial revision */
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/* LPC Configuration parameters: */
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/* Frame size, Prediction order, Pitch period */
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/* Arguments */
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/* $Log$
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* Revision 1.16 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 1.15 2003/09/19 01:20:22 markster
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* Code cleanups (bug #66)
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*
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* Revision 1.2 2003/09/19 01:20:22 markster
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* Code cleanups (bug #66)
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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 20:22:39 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_decoder_state that is passed as an
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* argument.
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*
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* Removed init function, since all initialization is now done in
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* init_lpc10_decoder_state().
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*
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* Revision 1.1 1996/08/19 22:32:38 jaf
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* Initial revision
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* */
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/* Revision 1.3 1996/03/29 22:05:55 jaf */
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/* Commented out the common block variables that are not needed by the */
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/* embedded version. */
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/* Revision 1.2 1996/03/26 19:34:50 jaf */
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/* Added comments indicating which constants are not needed in an */
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/* application that uses the LPC-10 coder. */
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/* Revision 1.1 1996/02/07 14:44:09 jaf */
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/* Initial revision */
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/* LPC Processing control variables: */
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/* *** Read-only: initialized in setup */
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/* Files for Speech, Parameter, and Bitstream Input & Output, */
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/* and message and debug outputs. */
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/* Here are the only files which use these variables: */
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/* lpcsim.f setup.f trans.f error.f vqsetup.f */
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/* Many files which use fdebug are not listed, since it is only used in */
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/* those other files conditionally, to print trace statements. */
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/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
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/* LPC order, Frame size, Quantization rate, Bits per frame, */
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/* Error correction */
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/* Subroutine SETUP is the only place where order is assigned a value, */
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/* and that value is 10. It could increase efficiency 1% or so to */
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/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
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*/
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/* a variable in a COMMON block, since it is used in many places in the */
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/* core of the coding and decoding routines. Actually, I take that back.
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*/
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/* At least when compiling with f2c, the upper bound of DO loops is */
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/* stored in a local variable before the DO loop begins, and then that is
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*/
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/* compared against on each iteration. */
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/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
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/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
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/* is used in only a few places, and never in the core coding and */
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/* decoding routines, so it could be eliminated entirely. */
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/* nbits is similar to quant, and is given a value of 54 in SETUP. */
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/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
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/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
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/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
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*/
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/* a constant or a variable, since it is only examined once per frame. */
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/* Leaving it as a variable that is set to .TRUE. seems like a good */
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/* idea, since it does enable some error-correction capability for */
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/* unvoiced frames, with no change in the coding rate, and no noticeable
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*/
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/* quality difference in the decoded speech. */
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|
|
/* integer quant, nbits */
|
||
|
|
/* *** Read/write: variables for debugging, not needed for LPC algorithm
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* Current frame, Unstable frames, Output clip count, Max onset buffer,
|
||
|
|
*/
|
||
|
|
/* Debug listing detail level, Line count on listing page */
|
||
|
|
|
||
|
|
/* nframe is not needed for an embedded LPC10 at all. */
|
||
|
|
/* nunsfm is initialized to 0 in SETUP, and incremented in subroutine */
|
||
|
|
/* ERROR, which is only called from RCCHK. When LPC10 is embedded into */
|
||
|
|
/* an application, I would recommend removing the call to ERROR in RCCHK,
|
||
|
|
*/
|
||
|
|
/* and remove ERROR and nunsfm completely. */
|
||
|
|
/* iclip is initialized to 0 in SETUP, and incremented in entry SWRITE in
|
||
|
|
*/
|
||
|
|
/* sread.f. When LPC10 is embedded into an application, one might want */
|
||
|
|
/* to cause it to be incremented in a routine that takes the output of */
|
||
|
|
/* SYNTHS and sends it to an audio device. It could be optionally */
|
||
|
|
/* displayed, for those that might want to know what it is. */
|
||
|
|
/* maxosp is never initialized to 0 in SETUP, although it probably should
|
||
|
|
*/
|
||
|
|
/* be, and it is updated in subroutine ANALYS. I doubt that its value */
|
||
|
|
/* would be of much interest to an application in which LPC10 is */
|
||
|
|
/* embedded. */
|
||
|
|
/* listl and lincnt are not needed for an embedded LPC10 at all. */
|
||
|
|
/* integer nframe, nunsfm, iclip, maxosp, listl, lincnt */
|
||
|
|
/* common /contrl/ fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
|
||
|
|
/* common /contrl/ quant, nbits */
|
||
|
|
/* common /contrl/ nframe, nunsfm, iclip, maxosp, listl, lincnt */
|
||
|
|
/* Function return value definitions */
|
||
|
|
|
||
|
|
/* Parameters/constants */
|
||
|
|
|
||
|
|
/* The variables below that are not Fortran PARAMETER's are */
|
||
|
|
/* initialized with DATA statements, and then never modified. */
|
||
|
|
/* The following are used regardless of CORRP's value. */
|
||
|
|
|
||
|
|
/* DETAU, NBIT, QB, DEADD, DETAB7, RMST, DESCL */
|
||
|
|
|
||
|
|
/* The following are used only if CORRP is .TRUE. */
|
||
|
|
|
||
|
|
/* ETHRS, ETHRS1, ETHRS2, ETHRS3, IVTAB, BIT, CORTH, ZRC */
|
||
|
|
|
||
|
|
/* Local variables that need not be saved */
|
||
|
|
|
||
|
|
/* The following are used regardless of CORRP's value */
|
||
|
|
/* The following are used only if CORRP is .TRUE. */
|
||
|
|
|
||
|
|
/* Local state */
|
||
|
|
|
||
|
|
/* The following are used regardless of CORRP's value */
|
||
|
|
/* The following are used only if CORRP is .TRUE. */
|
||
|
|
/* I am guessing the initial values for IVP2H, IOVOIC, DRC, DPIT, */
|
||
|
|
/* and DRMS. They should be checked to see if they are reasonable.
|
||
|
|
*/
|
||
|
|
/* I'm also guessing for ERATE, but I think 0 is the right initial
|
||
|
|
*/
|
||
|
|
/* value. */
|
||
|
|
/* Parameter adjustments */
|
||
|
|
if (irc) {
|
||
|
|
--irc;
|
||
|
|
}
|
||
|
|
if (voice) {
|
||
|
|
--voice;
|
||
|
|
}
|
||
|
|
if (rc) {
|
||
|
|
--rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Function Body */
|
||
|
|
|
||
|
|
iptold = &(st->iptold);
|
||
|
|
first = &(st->first);
|
||
|
|
ivp2h = &(st->ivp2h);
|
||
|
|
iovoic = &(st->iovoic);
|
||
|
|
iavgp = &(st->iavgp);
|
||
|
|
erate = &(st->erate);
|
||
|
|
drc = &(st->drc[0]);
|
||
|
|
dpit = &(st->dpit[0]);
|
||
|
|
drms = &(st->drms[0]);
|
||
|
|
|
||
|
|
/* DATA statements for "constants" defined above. */
|
||
|
|
/* IF (LISTL.GE.3) WRITE(FDEBUG,800) IPITV,IRMS,(IRC(J),J=1,ORDER) */
|
||
|
|
/* 800 FORMAT(1X,' <<ERRCOR IN>>',T32,6X,I6,I5,T50,10I8) */
|
||
|
|
/* If no error correction, do pitch and voicing then jump to decode */
|
||
|
|
i4 = detau[*ipitv];
|
||
|
|
if (! contrl_1.corrp) {
|
||
|
|
voice[1] = 1;
|
||
|
|
voice[2] = 1;
|
||
|
|
if (*ipitv <= 1) {
|
||
|
|
voice[1] = 0;
|
||
|
|
}
|
||
|
|
if (*ipitv == 0 || *ipitv == 2) {
|
||
|
|
voice[2] = 0;
|
||
|
|
}
|
||
|
|
*pitch = i4;
|
||
|
|
if (*pitch <= 4) {
|
||
|
|
*pitch = *iptold;
|
||
|
|
}
|
||
|
|
if (voice[1] == 1 && voice[2] == 1) {
|
||
|
|
*iptold = *pitch;
|
||
|
|
}
|
||
|
|
if (voice[1] != voice[2]) {
|
||
|
|
*pitch = *iptold;
|
||
|
|
}
|
||
|
|
goto L900;
|
||
|
|
}
|
||
|
|
/* Do error correction pitch and voicing */
|
||
|
|
if (i4 > 4) {
|
||
|
|
dpit[0] = i4;
|
||
|
|
ivoic = 2;
|
||
|
|
*iavgp = (*iavgp * 15 + i4 + 8) / 16;
|
||
|
|
} else {
|
||
|
|
ivoic = i4;
|
||
|
|
dpit[0] = *iavgp;
|
||
|
|
}
|
||
|
|
drms[0] = *irms;
|
||
|
|
i__1 = contrl_1.order;
|
||
|
|
for (i__ = 1; i__ <= i__1; ++i__) {
|
||
|
|
drc[i__ * 3 - 3] = irc[i__];
|
||
|
|
}
|
||
|
|
/* Determine index to IVTAB from V/UV decision */
|
||
|
|
/* If error rate is high then use alternate table */
|
||
|
|
index = (*ivp2h << 4) + (*iovoic << 2) + ivoic + 1;
|
||
|
|
i1 = ivtab[index - 1];
|
||
|
|
ipit = i1 & 3;
|
||
|
|
icorf = i1 / 8;
|
||
|
|
if (*erate < ethrs) {
|
||
|
|
icorf /= 64;
|
||
|
|
}
|
||
|
|
/* Determine error rate: 4=high 1=low */
|
||
|
|
ixcor = 4;
|
||
|
|
if (*erate < ethrs3) {
|
||
|
|
ixcor = 3;
|
||
|
|
}
|
||
|
|
if (*erate < ethrs2) {
|
||
|
|
ixcor = 2;
|
||
|
|
}
|
||
|
|
if (*erate < ethrs1) {
|
||
|
|
ixcor = 1;
|
||
|
|
}
|
||
|
|
/* Voice/unvoice decision determined from bits 0 and 1 of IVTAB */
|
||
|
|
voice[1] = icorf / 2 & 1;
|
||
|
|
voice[2] = icorf & 1;
|
||
|
|
/* Skip decoding on first frame because present data not yet available */
|
||
|
|
if (*first) {
|
||
|
|
*first = FALSE_;
|
||
|
|
/* Assign PITCH a "default" value on the first call, since */
|
||
|
|
/* otherwise it would be left uninitialized. The two lines
|
||
|
|
*/
|
||
|
|
/* below were copied from above, since it seemed like a */
|
||
|
|
/* reasonable thing to do for the first call. */
|
||
|
|
*pitch = i4;
|
||
|
|
if (*pitch <= 4) {
|
||
|
|
*pitch = *iptold;
|
||
|
|
}
|
||
|
|
goto L500;
|
||
|
|
}
|
||
|
|
/* If bit 4 of ICORF is set then correct RMS and RC(1) - RC(4). */
|
||
|
|
/* Determine error rate and correct errors using a Hamming 8,4 code */
|
||
|
|
/* during transition or unvoiced frame. If IOUT is negative, */
|
||
|
|
/* more than 1 error occurred, use previous frame's parameters. */
|
||
|
|
if ((icorf & bit[3]) != 0) {
|
||
|
|
errcnt = 0;
|
||
|
|
lsb = drms[1] & 1;
|
||
|
|
index = (drc[22] << 4) + drms[1] / 2;
|
||
|
|
ham84_(&index, &iout, &errcnt);
|
||
|
|
drms[1] = drms[2];
|
||
|
|
if (iout >= 0) {
|
||
|
|
drms[1] = (iout << 1) + lsb;
|
||
|
|
}
|
||
|
|
for (i__ = 1; i__ <= 4; ++i__) {
|
||
|
|
if (i__ == 1) {
|
||
|
|
i1 = ((drc[25] & 7) << 1) + (drc[28] & 1);
|
||
|
|
} else {
|
||
|
|
i1 = drc[(9 - i__) * 3 - 2] & 15;
|
||
|
|
}
|
||
|
|
i2 = drc[(5 - i__) * 3 - 2] & 31;
|
||
|
|
lsb = i2 & 1;
|
||
|
|
index = (i1 << 4) + i2 / 2;
|
||
|
|
ham84_(&index, &iout, &errcnt);
|
||
|
|
if (iout >= 0) {
|
||
|
|
iout = (iout << 1) + lsb;
|
||
|
|
if ((iout & 16) == 16) {
|
||
|
|
iout += -32;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
iout = drc[(5 - i__) * 3 - 1];
|
||
|
|
}
|
||
|
|
drc[(5 - i__) * 3 - 2] = iout;
|
||
|
|
}
|
||
|
|
/* Determine error rate */
|
||
|
|
*erate = (integer)(*erate * .96875f + errcnt * 102);
|
||
|
|
}
|
||
|
|
/* Get unsmoothed RMS, RC's, and PITCH */
|
||
|
|
*irms = drms[1];
|
||
|
|
i__1 = contrl_1.order;
|
||
|
|
for (i__ = 1; i__ <= i__1; ++i__) {
|
||
|
|
irc[i__] = drc[i__ * 3 - 2];
|
||
|
|
}
|
||
|
|
if (ipit == 1) {
|
||
|
|
dpit[1] = dpit[2];
|
||
|
|
}
|
||
|
|
if (ipit == 3) {
|
||
|
|
dpit[1] = dpit[0];
|
||
|
|
}
|
||
|
|
*pitch = dpit[1];
|
||
|
|
/* If bit 2 of ICORF is set then smooth RMS and RC's, */
|
||
|
|
if ((icorf & bit[1]) != 0) {
|
||
|
|
if ((i__1 = drms[1] - drms[0], (real) abs(i__1)) >= corth[ixcor + 3]
|
||
|
|
&& (i__2 = drms[1] - drms[2], (real) abs(i__2)) >= corth[
|
||
|
|
ixcor + 3]) {
|
||
|
|
*irms = median_(&drms[2], &drms[1], drms);
|
||
|
|
}
|
||
|
|
for (i__ = 1; i__ <= 6; ++i__) {
|
||
|
|
if ((i__1 = drc[i__ * 3 - 2] - drc[i__ * 3 - 3], (real) abs(i__1))
|
||
|
|
>= corth[ixcor + ((i__ + 2) << 2) - 5] && (i__2 = drc[i__ *
|
||
|
|
3 - 2] - drc[i__ * 3 - 1], (real) abs(i__2)) >= corth[
|
||
|
|
ixcor + ((i__ + 2) << 2) - 5]) {
|
||
|
|
irc[i__] = median_(&drc[i__ * 3 - 1], &drc[i__ * 3 - 2], &drc[
|
||
|
|
i__ * 3 - 3]);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/* If bit 3 of ICORF is set then smooth pitch */
|
||
|
|
if ((icorf & bit[2]) != 0) {
|
||
|
|
if ((i__1 = dpit[1] - dpit[0], (real) abs(i__1)) >= corth[ixcor - 1]
|
||
|
|
&& (i__2 = dpit[1] - dpit[2], (real) abs(i__2)) >= corth[
|
||
|
|
ixcor - 1]) {
|
||
|
|
*pitch = median_(&dpit[2], &dpit[1], dpit);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/* If bit 5 of ICORF is set then RC(5) - RC(10) are loaded with */
|
||
|
|
/* values so that after quantization bias is removed in decode */
|
||
|
|
/* the values will be zero. */
|
||
|
|
L500:
|
||
|
|
if ((icorf & bit[4]) != 0) {
|
||
|
|
i__1 = contrl_1.order;
|
||
|
|
for (i__ = 5; i__ <= i__1; ++i__) {
|
||
|
|
irc[i__] = zrc[i__ - 1];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
/* House keeping - one frame delay */
|
||
|
|
*iovoic = ivoic;
|
||
|
|
*ivp2h = voice[2];
|
||
|
|
dpit[2] = dpit[1];
|
||
|
|
dpit[1] = dpit[0];
|
||
|
|
drms[2] = drms[1];
|
||
|
|
drms[1] = drms[0];
|
||
|
|
i__1 = contrl_1.order;
|
||
|
|
for (i__ = 1; i__ <= i__1; ++i__) {
|
||
|
|
drc[i__ * 3 - 1] = drc[i__ * 3 - 2];
|
||
|
|
drc[i__ * 3 - 2] = drc[i__ * 3 - 3];
|
||
|
|
}
|
||
|
|
L900:
|
||
|
|
/* IF (LISTL.GE.3)WRITE(FDEBUG,801)VOICE,PITCH,IRMS,(IRC(J),J=1,ORDER) */
|
||
|
|
/* 801 FORMAT(1X,'<<ERRCOR OUT>>',T32,2I3,I6,I5,T50,10I8) */
|
||
|
|
/* Decode RMS */
|
||
|
|
*irms = rmst[(31 - *irms) * 2];
|
||
|
|
/* Decode RC(1) and RC(2) from log-area-ratios */
|
||
|
|
/* Protect from illegal coded value (-16) caused by bit errors */
|
||
|
|
for (i__ = 1; i__ <= 2; ++i__) {
|
||
|
|
i2 = irc[i__];
|
||
|
|
i1 = 0;
|
||
|
|
if (i2 < 0) {
|
||
|
|
i1 = 1;
|
||
|
|
i2 = -i2;
|
||
|
|
if (i2 > 15) {
|
||
|
|
i2 = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
i2 = detab7[i2 * 2];
|
||
|
|
if (i1 == 1) {
|
||
|
|
i2 = -i2;
|
||
|
|
}
|
||
|
|
ishift = 15 - nbit[i__ - 1];
|
||
|
|
irc[i__] = i2 * pow_ii(&c__2, &ishift);
|
||
|
|
}
|
||
|
|
/* Decode RC(3)-RC(10) to sign plus 14 bits */
|
||
|
|
i__1 = contrl_1.order;
|
||
|
|
for (i__ = 3; i__ <= i__1; ++i__) {
|
||
|
|
i2 = irc[i__];
|
||
|
|
ishift = 15 - nbit[i__ - 1];
|
||
|
|
i2 *= pow_ii(&c__2, &ishift);
|
||
|
|
i2 += qb[i__ - 3];
|
||
|
|
irc[i__] = (integer)(i2 * descl[i__ - 3] + deadd[i__ - 3]);
|
||
|
|
}
|
||
|
|
/* IF (LISTL.GE.3) WRITE(FDEBUG,811) IRMS, (IRC(I),I=1,ORDER) */
|
||
|
|
/* 811 FORMAT(1X,'<<DECODE OUT>>',T45,I4,1X,10I8) */
|
||
|
|
/* Scale RMS and RC's to reals */
|
||
|
|
*rms = (real) (*irms);
|
||
|
|
i__1 = contrl_1.order;
|
||
|
|
for (i__ = 1; i__ <= i__1; ++i__) {
|
||
|
|
rc[i__] = irc[i__] / 16384.f;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
} /* decode_ */
|