ref: 15701a1215303f4be0f064d47dd9c17aa2b6e92c
dir: /lpc10/pitsyn.c/
/*
* Revision 1.2 1996/08/20 20:40:12 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:31:12 jaf
* Initial revision
*
*/
/* -- translated by f2c (version 19951025).
You must link the resulting object file with the libraries:
-lf2c -lm (in that order)
*/
#include "f2c.h"
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);
/* ***************************************************************** */
/* PITSYN Version 53 */
/*
* Revision 1.2 1996/08/20 20:40:12 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_decoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_decoder_state().
*
* Revision 1.1 1996/08/19 22:31:12 jaf
* Initial revision
* */
/* Revision 1.2 1996/03/25 18:49:07 jaf */
/* Added commments about which indices of array arguments are read or */
/* written. */
/* Rearranged local variable declarations to indicate which need to be */
/* saved from one invocation to the next. Added entry INITPITSYN to */
/* reinitialize local state variables, if desired. */
/* Added lots of comments about proving that the maximum number of pitch */
/* periods (NOUT) that can be returned is 16. The call to STOP that */
/* could happen if NOUT got too large was removed as a result. */
/* Also proved that the total number of samples returned from N calls, */
/* each with identical values of LFRAME, will always be in the range */
/* N*LFRAME-MAXPIT+1 to N*LFRAME. */
/* Revision 1.1 1996/02/07 14:48:18 jaf */
/* Initial revision */
/* ***************************************************************** */
/* Synthesize a single pitch epoch */
/* Input: */
/* ORDER - Synthesis order (number of RC's) */
/* VOICE - Half frame voicing decisions */
/* Indices 1 through 2 read. */
/* LFRAME - Length of speech buffer */
/* Input/Output: */
/* PITCH - Pitch */
/* This value should be in the range MINPIT (20) to MAXPIT */
/* (156), inclusive. */
/* PITCH can be modified under some conditions. */
/* RMS - Energy (can be modified) */
/* RMS is changed to 1 if the value passed in is less than 1. */
/* RC - Reflection coefficients */
/* Indices 1 through ORDER can be temporarily overwritten with */
/* RCO, and then replaced with original values, under some */
/* conditions. */
/* Output: */
/* IVUV - Pitch epoch voicing decisions */
/* Indices (I) of IVUV, IPITI, and RMSI are written, */
/* and indices (J,I) of RCI are written, */
/* where I ranges from 1 to NOUT, and J ranges from 1 to ORDER. */
/* IPITI - Pitch epoch length */
/* RMSI - Pitch epoch energy */
/* RCI - Pitch epoch RC's */
/* NOUT - Number of pitch periods in this frame */
/* This is at least 0, at least 1 if MAXPIT .LT. LFRAME (this */
/* is currently true on every call), and can never be more than */
/* (LFRAME+MAXPIT-1)/PITCH, which is currently 16 with */
/* LFRAME=180, MAXPIT=156, and PITCH .GE. 20, as SYNTHS */
/* guarantees when it calls this subroutine. */
/* RATIO - Previous to present energy ratio */
/* Always assigned a value. */
/* Subroutine */ 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)
{
/* Initialized data */
real *rmso;
logical *first;
/* System generated locals */
integer rci_dim1 = 0, rci_offset, i__1, i__2;
real r__1;
/* Builtin functions */
double log(doublereal), exp(doublereal);
/* Local variables */
real alrn, alro, yarc[10], prop;
integer i__, j, vflag, jused, lsamp;
integer *jsamp;
real slope;
integer *ipito;
real uvpit;
integer ip, nl, ivoice;
integer *ivoico;
integer istart;
real *rco;
real xxy;
/* Arguments */
/* LPC Configuration parameters: */
/* Frame size, Prediction order, Pitch period */
/* Local variables that need not be saved */
/* LSAMP is initialized in the IF (FIRST) THEN clause, but it is */
/* not used the first time through, and it is given a value before
*/
/* use whenever FIRST is .FALSE., so it appears unnecessary to */
/* assign it a value when FIRST is .TRUE. */
/* Local state */
/* FIRST - .TRUE. only on first call to PITSYN. */
/* IVOICO - Previous VOICE(2) value. */
/* IPITO - Previous PITCH value. */
/* RMSO - Previous RMS value. */
/* RCO - Previous RC values. */
/* JSAMP - If this routine is called N times with identical values of */
/* LFRAME, then the total length of all pitch periods returned */
/* is always N*LFRAME-JSAMP, and JSAMP is always in the range 0
*/
/* to MAXPIT-1 (see below for why this is so). Thus JSAMP is */
/* the number of samples "left over" from the previous call to */
/* PITSYN, that haven't been "used" in a pitch period returned */
/* from this subroutine. Every time this subroutine is called,
*/
/* it returns pitch periods with a total length of at most */
/* LFRAME+JSAMP. */
/* IVOICO, IPITO, RCO, and JSAMP need not be assigned an initial value */
/* with a DATA statement, because they are always initialized on the */
/* first call to PITSYN. */
/* FIRST and RMSO should be initialized with DATA statements, because */
/* even on the first call, they are used before being initialized. */
/* Parameter adjustments */
if (rc) {
--rc;
}
if (rci) {
rci_dim1 = *order;
rci_offset = rci_dim1 + 1;
rci -= rci_offset;
}
if (voice) {
--voice;
}
if (ivuv) {
--ivuv;
}
if (ipiti) {
--ipiti;
}
if (rmsi) {
--rmsi;
}
/* Function Body */
ivoico = &(st->ivoico);
ipito = &(st->ipito);
rmso = &(st->rmso);
rco = &(st->rco[0]);
jsamp = &(st->jsamp);
first = &(st->first_pitsyn);
if (*rms < 1.f) {
*rms = 1.f;
}
if (*rmso < 1.f) {
*rmso = 1.f;
}
uvpit = 0.f;
*ratio = *rms / (*rmso + 8.f);
if (*first) {
lsamp = 0;
ivoice = voice[2];
if (ivoice == 0) {
*pitch = *lframe / 4;
}
*nout = *lframe / *pitch;
*jsamp = *lframe - *nout * *pitch;
/* SYNTHS only calls this subroutine with PITCH in the range
20 */
/* to 156. LFRAME = MAXFRM = 180, so NOUT is somewhere in th
e */
/* range 1 to 9. */
/* JSAMP is "LFRAME mod PITCH", so it is in the range 0 to */
/* (PITCH-1), or 0 to MAXPIT-1=155, after the first call. */
i__1 = *nout;
for (i__ = 1; i__ <= i__1; ++i__) {
i__2 = *order;
for (j = 1; j <= i__2; ++j) {
rci[j + i__ * rci_dim1] = rc[j];
}
ivuv[i__] = ivoice;
ipiti[i__] = *pitch;
rmsi[i__] = *rms;
}
*first = FALSE_;
} else {
vflag = 0;
lsamp = *lframe + *jsamp;
slope = (*pitch - *ipito) / (real) lsamp;
*nout = 0;
jused = 0;
istart = 1;
if (voice[1] == *ivoico && voice[2] == voice[1]) {
if (voice[2] == 0) {
/* SSUV - - 0 , 0 , 0 */
*pitch = *lframe / 4;
*ipito = *pitch;
if (*ratio > 8.f) {
*rmso = *rms;
}
}
/* SSVC - - 1 , 1 , 1 */
slope = (*pitch - *ipito) / (real) lsamp;
ivoice = voice[2];
} else {
if (*ivoico != 1) {
if (*ivoico == voice[1]) {
/* UV2VC2 - - 0 , 0 , 1 */
nl = lsamp - *lframe / 4;
} else {
/* UV2VC1 - - 0 , 1 , 1 */
nl = lsamp - *lframe * 3 / 4;
}
ipiti[1] = nl / 2;
ipiti[2] = nl - ipiti[1];
ivuv[1] = 0;
ivuv[2] = 0;
rmsi[1] = *rmso;
rmsi[2] = *rmso;
i__1 = *order;
for (i__ = 1; i__ <= i__1; ++i__) {
rci[i__ + rci_dim1] = rco[i__ - 1];
rci[i__ + (rci_dim1 << 1)] = rco[i__ - 1];
rco[i__ - 1] = rc[i__];
}
slope = 0.f;
*nout = 2;
*ipito = *pitch;
jused = nl;
istart = nl + 1;
ivoice = 1;
} else {
if (*ivoico != voice[1]) {
/* VC2UV1 - - 1 , 0 , 0 */
lsamp = *lframe / 4 + *jsamp;
} else {
/* VC2UV2 - - 1 , 1 , 0 */
lsamp = *lframe * 3 / 4 + *jsamp;
}
i__1 = *order;
for (i__ = 1; i__ <= i__1; ++i__) {
yarc[i__ - 1] = rc[i__];
rc[i__] = rco[i__ - 1];
}
ivoice = 1;
slope = 0.f;
vflag = 1;
}
}
/* Here is the value of most variables that are used below, depending
on */
/* the values of IVOICO, VOICE(1), and VOICE(2). VOICE(1) and VOICE(2
) */
/* are input arguments, and IVOICO is the value of VOICE(2) on the */
/* previous call (see notes for the IF (NOUT .NE. 0) statement near th
e */
/* end). Each of these three values is either 0 or 1. These three */
/* values below are given as 3-bit long strings, in the order IVOICO,
*/
/* VOICE(1), and VOICE(2). It appears that the code above assumes tha
t */
/* the bit sequences 010 and 101 never occur, but I wonder whether a
*/
/* large enough number of bit errors in the channel could cause such a
*/
/* thing to happen, and if so, could that cause NOUT to ever go over 1
1? */
/* Note that all of the 180 values in the table are really LFRAME, but
*/
/* 180 has fewer characters, and it makes the table a little more */
/* concrete. If LFRAME is ever changed, keep this in mind. Similarly
, */
/* 135's are 3*LFRAME/4, and 45's are LFRAME/4. If LFRAME is not a */
/* multiple of 4, then the 135 for NL-JSAMP is actually LFRAME-LFRAME/
4, */
/* and the 45 for NL-JSAMP is actually LFRAME-3*LFRAME/4. */
/* Note that LSAMP-JSAMP is given as the variable. This was just for
*/
/* brevity, to avoid adding "+JSAMP" to all of the column entries. */
/* Similarly for NL-JSAMP. */
/* Variable | 000 001 011,010 111 110 100,101 */
/* ------------+-------------------------------------------------- */
/* ISTART | 1 NL+1 NL+1 1 1 1 */
/* LSAMP-JSAMP | 180 180 180 180 135 45 */
/* IPITO | 45 PITCH PITCH oldPITCH oldPITCH oldPITCH */
/* SLOPE | 0 0 0 seebelow 0 0 */
/* JUSED | 0 NL NL 0 0 0 */
/* PITCH | 45 PITCH PITCH PITCH PITCH PITCH */
/* NL-JSAMP | -- 135 45 -- -- -- */
/* VFLAG | 0 0 0 0 1 1 */
/* NOUT | 0 2 2 0 0 0 */
/* IVOICE | 0 1 1 1 1 1 */
/* while_loop | once once once once twice twice */
/* ISTART | -- -- -- -- JUSED+1 JUSED+1 */
/* LSAMP-JSAMP | -- -- -- -- 180 180 */
/* IPITO | -- -- -- -- oldPITCH oldPITCH */
/* SLOPE | -- -- -- -- 0 0 */
/* JUSED | -- -- -- -- ?? ?? */
/* PITCH | -- -- -- -- PITCH PITCH */
/* NL-JSAMP | -- -- -- -- -- -- */
/* VFLAG | -- -- -- -- 0 0 */
/* NOUT | -- -- -- -- ?? ?? */
/* IVOICE | -- -- -- -- 0 0 */
/* UVPIT is always 0.0 on the first pass through the DO WHILE (.TRUE.)
*/
/* loop below. */
/* The only possible non-0 value of SLOPE (in column 111) is */
/* (PITCH-IPITO)/FLOAT(LSAMP) */
/* Column 101 is identical to 100. Any good properties we can prove
*/
/* for 100 will also hold for 101. Similarly for 010 and 011. */
/* SYNTHS calls this subroutine with PITCH restricted to the range 20
to */
/* 156. IPITO is similarly restricted to this range, after the first
*/
/* call. IP below is also restricted to this range, given the */
/* definitions of IPITO, SLOPE, UVPIT, and that I is in the range ISTA
RT */
/* to LSAMP. */
while(TRUE_) {
/* JUSED is the total length of all pitch periods curr
ently */
/* in the output arrays, in samples. */
/* An invariant of the DO I = ISTART,LSAMP loop below,
under */
/* the condition that IP is always in the range 1 thro
ugh */
/* MAXPIT, is: */
/* (I - MAXPIT) .LE. JUSED .LE. (I-1) */
/* Note that the final value of I is LSAMP+1, so that
after */
/* the DO loop is complete, we know: */
/* (LSAMP - MAXPIT + 1) .LE. JUSED .LE. LSAMP */
i__1 = lsamp;
for (i__ = istart; i__ <= i__1; ++i__) {
r__1 = *ipito + slope * i__;
ip = r__1 + .5f;
if (uvpit != 0.f) {
ip = uvpit;
}
if (ip <= i__ - jused) {
++(*nout);
/* The following check is no longer nece
ssary, now that */
/* we can prove that NOUT will never go
over 16. */
/* IF (NOUT .GT. 16) STOP 'PITSYN: too many epochs'
*/
ipiti[*nout] = ip;
*pitch = ip;
ivuv[*nout] = ivoice;
jused += ip;
prop = (jused - ip / 2) / (real) lsamp;
i__2 = *order;
for (j = 1; j <= i__2; ++j) {
alro = log((rco[j - 1] + 1) / (1 - rco[j - 1]));
alrn = log((rc[j] + 1) / (1 - rc[j]));
xxy = alro + prop * (alrn - alro);
xxy = exp(xxy);
rci[j + *nout * rci_dim1] = (xxy - 1) / (xxy + 1);
}
rmsi[*nout] = log(*rmso) + prop * (log(*rms) - log(*rmso));
rmsi[*nout] = 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_ */