568 lines
18 KiB
C
568 lines
18 KiB
C
/*
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$Log: pitsyn.c,v $
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Revision 1.1 2004/05/04 11:16:43 csoutheren
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Initial version
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Revision 1.2 2002/02/15 03:57:55 yurik
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Warnings removed during compilation, patch courtesy of Jehan Bing, jehan@bravobrava.com
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Revision 1.1 2000/06/05 04:45:12 robertj
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Added LPC-10 2400bps codec
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* Revision 1.2 1996/08/20 20:40:12 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 22:31:12 jaf
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* Initial revision
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*
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*/
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#ifdef P_R_O_T_O_T_Y_P_E_S
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extern int pitsyn_(integer *order, integer *voice, integer *pitch, real *rms, real *rc, integer *lframe, integer *ivuv, integer *ipiti, real *rmsi, real *rci, integer *nout, real *ratio, struct lpc10_decoder_state *st);
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#endif
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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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/* ***************************************************************** */
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/* PITSYN Version 53 */
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/* $Log: pitsyn.c,v $
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* Revision 1.1 2004/05/04 11:16:43 csoutheren
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* Initial version
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*
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* Revision 1.2 2002/02/15 03:57:55 yurik
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* Warnings removed during compilation, patch courtesy of Jehan Bing, jehan@bravobrava.com
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*
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* Revision 1.1 2000/06/05 04:45:12 robertj
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* Added LPC-10 2400bps codec
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*
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* Revision 1.2 1996/08/20 20:40:12 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 22:31:12 jaf
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* Initial revision
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*
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*/
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/* Revision 1.2 1996/03/25 18:49:07 jaf */
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/* Added commments about which indices of array arguments are read or */
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/* written. */
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/* Rearranged local variable declarations to indicate which need to be */
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/* saved from one invocation to the next. Added entry INITPITSYN to */
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/* reinitialize local state variables, if desired. */
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/* Added lots of comments about proving that the maximum number of pitch */
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/* periods (NOUT) that can be returned is 16. The call to STOP that */
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/* could happen if NOUT got too large was removed as a result. */
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/* Also proved that the total number of samples returned from N calls, */
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/* each with identical values of LFRAME, will always be in the range */
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/* N*LFRAME-MAXPIT+1 to N*LFRAME. */
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/* Revision 1.1 1996/02/07 14:48:18 jaf */
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/* Initial revision */
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/* ***************************************************************** */
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/* Synthesize a single pitch epoch */
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/* Input: */
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/* ORDER - Synthesis order (number of RC's) */
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/* VOICE - Half frame voicing decisions */
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/* Indices 1 through 2 read. */
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/* LFRAME - Length of speech buffer */
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/* Input/Output: */
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/* PITCH - Pitch */
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/* This value should be in the range MINPIT (20) to MAXPIT */
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/* (156), inclusive. */
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/* PITCH can be modified under some conditions. */
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/* RMS - Energy (can be modified) */
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/* RMS is changed to 1 if the value passed in is less than 1. */
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/* RC - Reflection coefficients */
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/* Indices 1 through ORDER can be temporarily overwritten with */
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/* RCO, and then replaced with original values, under some */
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/* conditions. */
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/* Output: */
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/* IVUV - Pitch epoch voicing decisions */
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/* Indices (I) of IVUV, IPITI, and RMSI are written, */
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/* and indices (J,I) of RCI are written, */
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/* where I ranges from 1 to NOUT, and J ranges from 1 to ORDER. */
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/* IPITI - Pitch epoch length */
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/* RMSI - Pitch epoch energy */
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/* RCI - Pitch epoch RC's */
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/* NOUT - Number of pitch periods in this frame */
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/* This is at least 0, at least 1 if MAXPIT .LT. LFRAME (this */
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/* is currently true on every call), and can never be more than */
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/* (LFRAME+MAXPIT-1)/PITCH, which is currently 16 with */
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/* LFRAME=180, MAXPIT=156, and PITCH .GE. 20, as SYNTHS */
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/* guarantees when it calls this subroutine. */
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/* RATIO - Previous to present energy ratio */
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/* Always assigned a value. */
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/* Subroutine */ int pitsyn_(integer *order, integer *voice,
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integer *pitch, real *rms, real *rc, integer *lframe, integer *ivuv,
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integer *ipiti, real *rmsi, real *rci, integer *nout, real *ratio,
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struct lpc10_decoder_state *st)
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{
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/* Initialized data */
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real *rmso;
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logical *first;
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/* System generated locals */
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integer rci_dim1, rci_offset, i__1, i__2;
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real r__1;
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/* Builtin functions */
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double log(doublereal), exp(doublereal);
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/* Local variables */
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real alrn, alro, yarc[10], prop;
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integer i__, j, vflag, jused, lsamp;
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integer *jsamp;
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real slope;
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integer *ipito;
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real uvpit;
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integer ip, nl, ivoice;
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integer *ivoico;
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integer istart;
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real *rco;
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real xxy;
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/* Arguments */
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/* $Log: pitsyn.c,v $
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* Revision 1.1 2004/05/04 11:16:43 csoutheren
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* Initial version
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*
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* Revision 1.2 2002/02/15 03:57:55 yurik
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* Warnings removed during compilation, patch courtesy of Jehan Bing, jehan@bravobrava.com
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*
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* Revision 1.1 2000/06/05 04:45:12 robertj
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* Added LPC-10 2400bps codec
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*
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* Revision 1.2 1996/08/20 20:40:12 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 22:31:12 jaf
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* Initial revision
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*
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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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/* Local variables that need not be saved */
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/* LSAMP is initialized in the IF (FIRST) THEN clause, but it is */
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/* not used the first time through, and it is given a value before
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*/
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/* use whenever FIRST is .FALSE., so it appears unnecessary to */
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/* assign it a value when FIRST is .TRUE. */
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/* Local state */
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/* FIRST - .TRUE. only on first call to PITSYN. */
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/* IVOICO - Previous VOICE(2) value. */
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/* IPITO - Previous PITCH value. */
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/* RMSO - Previous RMS value. */
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/* RCO - Previous RC values. */
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/* JSAMP - If this routine is called N times with identical values of */
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/* LFRAME, then the total length of all pitch periods returned */
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/* is always N*LFRAME-JSAMP, and JSAMP is always in the range 0
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*/
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/* to MAXPIT-1 (see below for why this is so). Thus JSAMP is */
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/* the number of samples "left over" from the previous call to */
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/* PITSYN, that haven't been "used" in a pitch period returned */
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/* from this subroutine. Every time this subroutine is called,
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*/
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/* it returns pitch periods with a total length of at most */
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/* LFRAME+JSAMP. */
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/* IVOICO, IPITO, RCO, and JSAMP need not be assigned an initial value */
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/* with a DATA statement, because they are always initialized on the */
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/* first call to PITSYN. */
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/* FIRST and RMSO should be initialized with DATA statements, because */
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/* even on the first call, they are used before being initialized. */
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/* Parameter adjustments */
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if (rc) {
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--rc;
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}
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if (rci) {
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rci_dim1 = *order;
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rci_offset = rci_dim1 + 1;
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rci -= rci_offset;
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}
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if (voice) {
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--voice;
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}
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if (ivuv) {
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--ivuv;
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}
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if (ipiti) {
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--ipiti;
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}
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if (rmsi) {
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--rmsi;
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}
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/* Function Body */
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ivoico = &(st->ivoico);
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ipito = &(st->ipito);
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rmso = &(st->rmso);
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rco = &(st->rco[0]);
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jsamp = &(st->jsamp);
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first = &(st->first_pitsyn);
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if (*rms < 1.f) {
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*rms = 1.f;
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}
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if (*rmso < 1.f) {
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*rmso = 1.f;
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}
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uvpit = 0.f;
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*ratio = *rms / (*rmso + 8.f);
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if (*first) {
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lsamp = 0;
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ivoice = voice[2];
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if (ivoice == 0) {
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*pitch = *lframe / 4;
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}
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*nout = *lframe / *pitch;
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*jsamp = *lframe - *nout * *pitch;
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/* SYNTHS only calls this subroutine with PITCH in the range
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20 */
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/* to 156. LFRAME = MAXFRM = 180, so NOUT is somewhere in th
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e */
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/* range 1 to 9. */
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/* JSAMP is "LFRAME mod PITCH", so it is in the range 0 to */
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/* (PITCH-1), or 0 to MAXPIT-1=155, after the first call. */
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i__1 = *nout;
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for (i__ = 1; i__ <= i__1; ++i__) {
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i__2 = *order;
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for (j = 1; j <= i__2; ++j) {
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rci[j + i__ * rci_dim1] = rc[j];
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}
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ivuv[i__] = ivoice;
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ipiti[i__] = *pitch;
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rmsi[i__] = *rms;
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}
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*first = FALSE_;
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} else {
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vflag = 0;
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lsamp = *lframe + *jsamp;
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slope = (*pitch - *ipito) / (real) lsamp;
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*nout = 0;
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jused = 0;
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istart = 1;
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if (voice[1] == *ivoico && voice[2] == voice[1]) {
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if (voice[2] == 0) {
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/* SSUV - - 0 , 0 , 0 */
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*pitch = *lframe / 4;
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*ipito = *pitch;
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if (*ratio > 8.f) {
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*rmso = *rms;
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}
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}
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/* SSVC - - 1 , 1 , 1 */
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slope = (*pitch - *ipito) / (real) lsamp;
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ivoice = voice[2];
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} else {
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if (*ivoico != 1) {
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if (*ivoico == voice[1]) {
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/* UV2VC2 - - 0 , 0 , 1 */
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nl = lsamp - *lframe / 4;
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} else {
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/* UV2VC1 - - 0 , 1 , 1 */
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nl = lsamp - *lframe * 3 / 4;
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}
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ipiti[1] = nl / 2;
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ipiti[2] = nl - ipiti[1];
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ivuv[1] = 0;
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ivuv[2] = 0;
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rmsi[1] = *rmso;
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rmsi[2] = *rmso;
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i__1 = *order;
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for (i__ = 1; i__ <= i__1; ++i__) {
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rci[i__ + rci_dim1] = rco[i__ - 1];
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rci[i__ + (rci_dim1 << 1)] = rco[i__ - 1];
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rco[i__ - 1] = rc[i__];
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}
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slope = 0.f;
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*nout = 2;
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*ipito = *pitch;
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jused = nl;
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istart = nl + 1;
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ivoice = 1;
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} else {
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if (*ivoico != voice[1]) {
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/* VC2UV1 - - 1 , 0 , 0 */
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lsamp = *lframe / 4 + *jsamp;
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} else {
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/* VC2UV2 - - 1 , 1 , 0 */
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lsamp = *lframe * 3 / 4 + *jsamp;
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}
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i__1 = *order;
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for (i__ = 1; i__ <= i__1; ++i__) {
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yarc[i__ - 1] = rc[i__];
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rc[i__] = rco[i__ - 1];
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}
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ivoice = 1;
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slope = 0.f;
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vflag = 1;
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}
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}
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/* Here is the value of most variables that are used below, depending
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on */
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/* the values of IVOICO, VOICE(1), and VOICE(2). VOICE(1) and VOICE(2
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) */
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/* are input arguments, and IVOICO is the value of VOICE(2) on the */
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/* previous call (see notes for the IF (NOUT .NE. 0) statement near th
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e */
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/* end). Each of these three values is either 0 or 1. These three */
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/* values below are given as 3-bit long strings, in the order IVOICO,
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*/
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/* VOICE(1), and VOICE(2). It appears that the code above assumes tha
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t */
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/* the bit sequences 010 and 101 never occur, but I wonder whether a
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*/
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/* large enough number of bit errors in the channel could cause such a
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*/
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/* thing to happen, and if so, could that cause NOUT to ever go over 1
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1? */
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/* Note that all of the 180 values in the table are really LFRAME, but
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*/
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/* 180 has fewer characters, and it makes the table a little more */
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/* concrete. If LFRAME is ever changed, keep this in mind. Similarly
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, */
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/* 135's are 3*LFRAME/4, and 45's are LFRAME/4. If LFRAME is not a */
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/* multiple of 4, then the 135 for NL-JSAMP is actually LFRAME-LFRAME/
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4, */
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/* and the 45 for NL-JSAMP is actually LFRAME-3*LFRAME/4. */
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/* Note that LSAMP-JSAMP is given as the variable. This was just for
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*/
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/* brevity, to avoid adding "+JSAMP" to all of the column entries. */
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/* Similarly for NL-JSAMP. */
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/* Variable | 000 001 011,010 111 110 100,101 */
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/* ------------+-------------------------------------------------- */
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/* ISTART | 1 NL+1 NL+1 1 1 1 */
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/* LSAMP-JSAMP | 180 180 180 180 135 45 */
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/* IPITO | 45 PITCH PITCH oldPITCH oldPITCH oldPITCH */
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/* SLOPE | 0 0 0 seebelow 0 0 */
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/* JUSED | 0 NL NL 0 0 0 */
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/* PITCH | 45 PITCH PITCH PITCH PITCH PITCH */
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/* NL-JSAMP | -- 135 45 -- -- -- */
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/* VFLAG | 0 0 0 0 1 1 */
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/* NOUT | 0 2 2 0 0 0 */
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/* IVOICE | 0 1 1 1 1 1 */
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/* while_loop | once once once once twice twice */
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/* ISTART | -- -- -- -- JUSED+1 JUSED+1 */
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/* LSAMP-JSAMP | -- -- -- -- 180 180 */
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/* IPITO | -- -- -- -- oldPITCH oldPITCH */
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/* SLOPE | -- -- -- -- 0 0 */
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/* JUSED | -- -- -- -- ?? ?? */
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/* PITCH | -- -- -- -- PITCH PITCH */
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/* NL-JSAMP | -- -- -- -- -- -- */
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/* VFLAG | -- -- -- -- 0 0 */
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/* NOUT | -- -- -- -- ?? ?? */
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/* IVOICE | -- -- -- -- 0 0 */
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/* UVPIT is always 0.0 on the first pass through the DO WHILE (.TRUE.)
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*/
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/* loop below. */
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/* The only possible non-0 value of SLOPE (in column 111) is */
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/* (PITCH-IPITO)/FLOAT(LSAMP) */
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/* Column 101 is identical to 100. Any good properties we can prove
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*/
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/* for 100 will also hold for 101. Similarly for 010 and 011. */
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/* SYNTHS calls this subroutine with PITCH restricted to the range 20
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to */
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/* 156. IPITO is similarly restricted to this range, after the first
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*/
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/* call. IP below is also restricted to this range, given the */
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/* definitions of IPITO, SLOPE, UVPIT, and that I is in the range ISTA
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RT */
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/* to LSAMP. */
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while(TRUE_) {
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/* JUSED is the total length of all pitch periods curr
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ently */
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/* in the output arrays, in samples. */
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/* An invariant of the DO I = ISTART,LSAMP loop below,
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under */
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/* the condition that IP is always in the range 1 thro
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ugh */
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/* MAXPIT, is: */
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/* (I - MAXPIT) .LE. JUSED .LE. (I-1) */
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/* Note that the final value of I is LSAMP+1, so that
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after */
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/* the DO loop is complete, we know: */
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/* (LSAMP - MAXPIT + 1) .LE. JUSED .LE. LSAMP */
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i__1 = lsamp;
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for (i__ = istart; i__ <= i__1; ++i__) {
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r__1 = *ipito + slope * i__;
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ip = (integer)(r__1 + .5f);
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if (uvpit != 0.f) {
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ip = (integer)uvpit;
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}
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if (ip <= i__ - jused) {
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++(*nout);
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/* The following check is no longer nece
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ssary, now that */
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/* we can prove that NOUT will never go
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over 16. */
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/* IF (NOUT .GT. 16) STOP 'PITSYN: too many epochs'
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*/
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ipiti[*nout] = ip;
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*pitch = ip;
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ivuv[*nout] = ivoice;
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jused += ip;
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prop = (jused - ip / 2) / (real) lsamp;
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i__2 = *order;
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for (j = 1; j <= i__2; ++j) {
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alro = (real)log((rco[j - 1] + 1) / (1 - rco[j - 1]));
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alrn = (real)log((rc[j] + 1) / (1 - rc[j]));
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xxy = alro + prop * (alrn - alro);
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xxy = (real)exp(xxy);
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rci[j + *nout * rci_dim1] = (xxy - 1) / (xxy + 1);
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}
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rmsi[*nout] = (real)(log(*rmso) + prop * (log(*rms) - log(*rmso)));
|
|
rmsi[*nout] = (real)exp(rmsi[*nout]);
|
|
}
|
|
}
|
|
if (vflag != 1) {
|
|
goto L100;
|
|
}
|
|
|
|
/* I want to prove what range UVPIT must lie in after
|
|
the */
|
|
/* assignments to it below. To do this, I must determ
|
|
ine */
|
|
/* what range (LSAMP-ISTART) must lie in, after the */
|
|
/* assignments to ISTART and LSAMP below. */
|
|
|
|
/* Let oldLSAMP be the value of LSAMP at this point in
|
|
the */
|
|
/* execution. This is 135+JSAMP in state 110, or 45+J
|
|
SAMP in */
|
|
/* states 100 or 101. */
|
|
|
|
/* Given the loop invariant on JUSED above, we know th
|
|
at: */
|
|
|
|
/* (oldLSAMP - MAXPIT + 1) .LE. JUSED .LE. oldLSAMP */
|
|
|
|
/* ISTART is one more than this. */
|
|
|
|
/* Let newLSAMP be the value assigned to LSAMP below.
|
|
This */
|
|
/* is 180+JSAMP. Thus (newLSAMP-oldLSAMP) is either 4
|
|
5 or */
|
|
/* 135, depending on the state. */
|
|
|
|
/* Thus, the range of newLSAMP-ISTART is: */
|
|
|
|
/* (newLSAMP-(oldLSAMP+1)) .LE. newLSAMP-ISTART */
|
|
/* .LE. (newLSAMP-(oldLSAMP - MAXPIT + 2)) */
|
|
|
|
/* or: */
|
|
|
|
/* 46 .LE. newLSAMP-ISTART .LE. 133+MAXPIT .EQ. 289 */
|
|
|
|
/* Therefore, UVPIT is in the range 23 to 144 after th
|
|
e first */
|
|
/* assignment to UVPIT below, and after the conditiona
|
|
l */
|
|
/* assignment, it is in the range 23 to 90. */
|
|
|
|
/* The important thing is that it is in the range 20 t
|
|
o 156, */
|
|
/* so that in the loop above, IP is always in this ran
|
|
ge. */
|
|
|
|
vflag = 0;
|
|
istart = jused + 1;
|
|
lsamp = *lframe + *jsamp;
|
|
slope = 0.f;
|
|
ivoice = 0;
|
|
uvpit = (real) ((lsamp - istart) / 2);
|
|
if (uvpit > 90.f) {
|
|
uvpit /= 2;
|
|
}
|
|
*rmso = *rms;
|
|
i__1 = *order;
|
|
for (i__ = 1; i__ <= i__1; ++i__) {
|
|
rc[i__] = yarc[i__ - 1];
|
|
rco[i__ - 1] = yarc[i__ - 1];
|
|
}
|
|
}
|
|
L100:
|
|
*jsamp = lsamp - jused;
|
|
}
|
|
/* Given that the maximum pitch period MAXPIT .LT. LFRAME (this is
|
|
*/
|
|
/* currently true on every call, since SYNTHS always sets */
|
|
/* LFRAME=180), NOUT will always be .GE. 1 at this point. */
|
|
if (*nout != 0) {
|
|
*ivoico = voice[2];
|
|
*ipito = *pitch;
|
|
*rmso = *rms;
|
|
i__1 = *order;
|
|
for (i__ = 1; i__ <= i__1; ++i__) {
|
|
rco[i__ - 1] = rc[i__];
|
|
}
|
|
}
|
|
return 0;
|
|
} /* pitsyn_ */
|