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asterisk/codecs/lpc10/voicin.c

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v18.15.1
2023-05-25 18:45:57 +00:00
/*
$Log$
Revision 1.16 2004/06/26 03:50:14 markster
Merge source cleanups (bug #1911)
Revision 1.15 2003/11/23 22:14:32 markster
Various warning cleanups
Revision 1.14 2003/02/12 13:59:15 matteo
mer feb 12 14:56:57 CET 2003
Revision 1.1.1.1 2003/02/12 13:59:15 matteo
mer feb 12 14:56:57 CET 2003
Revision 1.2 2000/01/05 08:20:40 markster
Some OSS fixes and a few lpc changes to make it actually work
* Revision 1.2 1996/08/20 20:45:00 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:30:14 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"
#ifdef P_R_O_T_O_T_Y_P_E_S
extern int voicin_(integer *vwin, real *inbuf, real *lpbuf, integer *buflim, integer *half, real *minamd, real *maxamd, integer *mintau, real *ivrc, integer *obound, integer *voibuf, integer *af, struct lpc10_encoder_state *st);
/* comlen contrl_ 12 */
/*:ref: vparms_ 14 14 4 6 6 4 4 6 4 4 4 4 6 6 6 6 */
#endif
/* Common Block Declarations */
extern struct {
integer order, lframe;
logical corrp;
} contrl_;
#define contrl_1 contrl_
/****************************************************************************/
/* VOICIN Version 52 */
/* $Log$
* Revision 1.16 2004/06/26 03:50:14 markster
* Merge source cleanups (bug #1911)
*
* Revision 1.15 2003/11/23 22:14:32 markster
* Various warning cleanups
*
* Revision 1.14 2003/02/12 13:59:15 matteo
* mer feb 12 14:56:57 CET 2003
*
* Revision 1.1.1.1 2003/02/12 13:59:15 matteo
* mer feb 12 14:56:57 CET 2003
*
* Revision 1.2 2000/01/05 08:20:40 markster
* Some OSS fixes and a few lpc changes to make it actually work
*
* Revision 1.2 1996/08/20 20:45:00 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:30:14 jaf
* Initial revision
* */
/* Revision 1.10 1996/03/29 17:59:14 jaf */
/* Avoided using VALUE(9), although it shouldn't affect the function of */
/* the code at all, because it was always multiplied by VDC(9,SNRL), */
/* which is 0 for all values of SNRL. Still, if VALUE(9) had an initial */
/* value of IEEE NaN, it might cause trouble (I don't know how IEEE */
/* defines Nan * 0. It should either be NaN or 0.) */
/* Revision 1.9 1996/03/29 17:54:46 jaf */
/* Added a few comments about the accesses made to argument array VOIBUF */
/* and the local saved array VOICE. */
/* Revision 1.8 1996/03/27 18:19:54 jaf */
/* Added an assignment to VSTATE that does not affect the function of the */
/* program at all. The only reason I put it in was so that the tracing */
/* statements at the end, when enabled, will print a consistent value for */
/* VSTATE when HALF .EQ. 1, rather than a garbage value that could change */
/* from one call to the next. */
/* Revision 1.7 1996/03/26 20:00:06 jaf */
/* Removed the inclusion of the file "vcomm.fh", and put its contents */
/* into this file. It was included nowhere else but here. */
/* Revision 1.6 1996/03/26 19:38:09 jaf */
/* Commented out trace statements. */
/* Revision 1.5 1996/03/19 20:43:45 jaf */
/* Added comments about which indices of OBOUND and VOIBUF can be */
/* accessed, and whether they are read or written. VOIBUF is fairly */
/* messy. */
/* Revision 1.4 1996/03/19 15:00:58 jaf */
/* Moved the DATA statements for the *VDC* variables later, as it is */
/* apparently illegal to have DATA statements before local variable */
/* declarations. */
/* Revision 1.3 1996/03/19 00:10:49 jaf */
/* Heavily commented the local variables that are saved from one */
/* invocation to the next, and how the local variable FIRST is used to */
/* avoid the need to assign most of them initial values with DATA */
/* statements. */
/* A few should be initialized, but aren't. I've guessed initial values */
/* for two of these, SFBUE and SLBUE, and I've convinced myself that for */
/* VOICE, the effects of uninitialized values will die out after 2 or 3 */
/* frame times. It would still be good to choose initial values for */
/* these, but I don't know what reasonable values would be (0 comes to */
/* mind). */
/* Revision 1.2 1996/03/13 16:09:28 jaf */
/* Comments added explaining which of the local variables of this */
/* subroutine need to be saved from one invocation to the next, and which */
/* do not. */
/* WARNING! Some of them that should are never given initial values in */
/* this code. Hopefully, Fortran 77 defines initial values for them, but */
/* even so, giving them explicit initial values is preferable. */
/* WARNING! VALUE(9) is used, but never assigned a value. It should */
/* probably be eliminated from the code. */
/* Revision 1.1 1996/02/07 14:50:28 jaf */
/* Initial revision */
/****************************************************************************/
/* Voicing Detection (VOICIN) makes voicing decisions for each half */
/* frame of input speech. Tentative voicing decisions are made two frames*/
/* in the future (2F) for each half frame. These decisions are carried */
/* through one frame in the future (1F) to the present (P) frame where */
/* they are examined and smoothed, resulting in the final voicing */
/* decisions for each half frame. */
/* The voicing parameter (signal measurement) column vector (VALUE) */
/* is based on a rectangular window of speech samples determined by the */
/* window placement algorithm. The voicing parameter vector contains the*/
/* AMDF windowed maximum-to-minimum ratio, the zero crossing rate, energy*/
/* measures, reflection coefficients, and prediction gains. The voicing */
/* window is placed to avoid contamination of the voicing parameter vector*/
/* with speech onsets. */
/* The input signal is then classified as unvoiced (including */
/* silence) or voiced. This decision is made by a linear discriminant */
/* function consisting of a dot product of the voicing decision */
/* coefficient (VDC) row vector with the measurement column vector */
/* (VALUE). The VDC vector is 2-dimensional, each row vector is optimized*/
/* for a particular signal-to-noise ratio (SNR). So, before the dot */
/* product is performed, the SNR is estimated to select the appropriate */
/* VDC vector. */
/* The smoothing algorithm is a modified median smoother. The */
/* voicing discriminant function is used by the smoother to determine how*/
/* strongly voiced or unvoiced a signal is. The smoothing is further */
/* modified if a speech onset and a voicing decision transition occur */
/* within one half frame. In this case, the voicing decision transition */
/* is extended to the speech onset. For transmission purposes, there are*/
/* constraints on the duration and transition of voicing decisions. The */
/* smoother takes these constraints into account. */
/* Finally, the energy estimates are updated along with the dither */
/* threshold used to calculate the zero crossing rate (ZC). */
/* Inputs: */
/* VWIN - Voicing window limits */
/* The indices read of arrays VWIN, INBUF, LPBUF, and BUFLIM */
/* are the same as those read by subroutine VPARMS. */
/* INBUF - Input speech buffer */
/* LPBUF - Low-pass filtered speech buffer */
/* BUFLIM - INBUF and LPBUF limits */
/* HALF - Present analysis half frame number */
/* MINAMD - Minimum value of the AMDF */
/* MAXAMD - Maximum value of the AMDF */
/* MINTAU - Pointer to the lag of the minimum AMDF value */
/* IVRC(2) - Inverse filter's RC's */
/* Only index 2 of array IVRC read under normal operation. */
/* (Index 1 is also read when debugging is turned on.) */
/* OBOUND - Onset boundary descriptions */
/* Indices 1 through 3 read if (HALF .NE. 1), otherwise untouched.
*/
/* AF - The analysis frame number */
/* Output: */
/* VOIBUF(2,0:AF) - Buffer of voicing decisions */
/* Index (HALF,3) written. */
/* If (HALF .EQ. 1), skip down to "Read (HALF,3)" below. */
/* Indices (1,2), (2,1), (1,2), and (2,2) read. */
/* One of the following is then done: */
/* read (1,3) and possibly write (1,2) */
/* read (1,3) and write (1,2) or (2,2) */
/* write (2,1) */
/* write (2,1) or (1,2) */
/* read (1,0) and (1,3) and then write (2,2) or (1,1) */
/* no reads or writes on VOIBUF */
/* Finally, read (HALF,3) */
/* Internal: */
/* QS - Ratio of preemphasized to full-band energies */
/* RC1 - First reflection coefficient */
/* AR_B - Product of the causal forward and reverse pitch prediction gain
s*/
/* AR_F - Product of the noncausal forward and rev. pitch prediction gain
s*/
/* ZC - Zero crossing rate */
/* DITHER - Zero crossing threshold level */
/* MAXMIN - AMDF's 1 octave windowed maximum-to-minimum ratio */
/* MINPTR - Location of minimum AMDF value */
/* NVDC - Number of elements in each VDC vector */
/* NVDCL - Number of VDC vectors */
/* VDCL - SNR values corresponding to the set of VDC's */
/* VDC - 2-D voicing decision coefficient vector */
/* VALUE(9) - Voicing Parameters */
/* VOICE(2,3)- History of LDA results */
/* On every call when (HALF .EQ. 1), VOICE(*,I+1) is */
/* shifted back to VOICE(*,I), for I=1,2. */
/* VOICE(HALF,3) is written on every call. */
/* Depending on several conditions, one or more of */
/* (1,1), (1,2), (2,1), and (2,2) might then be read. */
/* LBE - Ratio of low-band instantaneous to average energies */
/* FBE - Ratio of full-band instantaneous to average energies */
/* LBVE - Low band voiced energy */
/* LBUE - Low band unvoiced energy */
/* FBVE - Full band voiced energy */
/* FBUE - Full band unvoiced energy */
/* OFBUE - Previous full-band unvoiced energy */
/* OLBUE - Previous low-band unvoiced energy */
/* REF - Reference energy for initialization and DITHER threshold */
/* SNR - Estimate of signal-to-noise ratio */
/* SNR2 - Estimate of low-band signal-to-noise ratio */
/* SNRL - SNR level number */
/* OT - Onset transition present */
/* VSTATE - Decimal interpretation of binary voicing classifications */
/* FIRST - First call flag */
/* This subroutine maintains local state from one call to the next. If */
/* you want to switch to using a new audio stream for this filter, or */
/* reinitialize its state for any other reason, call the ENTRY */
/* INITVOICIN. */
/* Subroutine */ int voicin_(integer *vwin, real *inbuf, real *
lpbuf, integer *buflim, integer *half, real *minamd, real *maxamd,
integer *mintau, real *ivrc, integer *obound, integer *voibuf,
integer *af, struct lpc10_encoder_state *st)
{
/* Initialized data */
real *dither;
static real vdc[100] /* was [10][10] */ = { 0.f,1714.f,-110.f,
334.f,-4096.f,-654.f,3752.f,3769.f,0.f,1181.f,0.f,874.f,-97.f,
300.f,-4096.f,-1021.f,2451.f,2527.f,0.f,-500.f,0.f,510.f,-70.f,
250.f,-4096.f,-1270.f,2194.f,2491.f,0.f,-1500.f,0.f,500.f,-10.f,
200.f,-4096.f,-1300.f,2e3f,2e3f,0.f,-2e3f,0.f,500.f,0.f,0.f,
-4096.f,-1300.f,2e3f,2e3f,0.f,-2500.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,
0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,
0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,
0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f,0.f };
static integer nvdcl = 5;
static real vdcl[10] = { 600.f,450.f,300.f,200.f,0.f,0.f,0.f,0.f,0.f,0.f }
;
/* System generated locals */
integer inbuf_offset = 0, lpbuf_offset = 0, i__1, i__2;
real r__1, r__2;
/* Builtin functions */
integer i_nint(real *);
double sqrt(doublereal);
/* Local variables */
real ar_b__, ar_f__;
integer *lbve, *lbue, *fbve, *fbue;
integer snrl, i__;
integer *ofbue, *sfbue;
real *voice;
integer *olbue, *slbue;
real value[9];
integer zc;
logical ot;
real qs;
real *maxmin;
integer vstate;
real rc1;
extern /* Subroutine */ int vparms_(integer *, real *, real *, integer *,
integer *, real *, integer *, integer *, integer *, integer *,
real *, real *, real *, real *);
integer fbe, lbe;
real *snr;
real snr2;
/* Global Variables: */
/* Arguments */
/* $Log$
* Revision 1.16 2004/06/26 03:50:14 markster
* Merge source cleanups (bug #1911)
*
* Revision 1.15 2003/11/23 22:14:32 markster
* Various warning cleanups
*
* Revision 1.14 2003/02/12 13:59:15 matteo
* mer feb 12 14:56:57 CET 2003
*
* Revision 1.1.1.1 2003/02/12 13:59:15 matteo
* mer feb 12 14:56:57 CET 2003
*
* Revision 1.2 2000/01/05 08:20:40 markster
* Some OSS fixes and a few lpc changes to make it actually work
*
* Revision 1.2 1996/08/20 20:45:00 jaf
* Removed all static local variables that were SAVE'd in the Fortran
* code, and put them in struct lpc10_encoder_state that is passed as an
* argument.
*
* Removed init function, since all initialization is now done in
* init_lpc10_encoder_state().
*
* Revision 1.1 1996/08/19 22:30:14 jaf
* Initial revision
* */
/* Revision 1.3 1996/03/29 22:05:55 jaf */
/* Commented out the common block variables that are not needed by the */
/* embedded version. */
/* Revision 1.2 1996/03/26 19:34:50 jaf */
/* Added comments indicating which constants are not needed in an */
/* application that uses the LPC-10 coder. */
/* Revision 1.1 1996/02/07 14:44:09 jaf */
/* Initial revision */
/* LPC Processing control variables: */
/* *** Read-only: initialized in setup */
/* Files for Speech, Parameter, and Bitstream Input & Output, */
/* and message and debug outputs. */
/* Here are the only files which use these variables: */
/* lpcsim.f setup.f trans.f error.f vqsetup.f */
/* Many files which use fdebug are not listed, since it is only used in */
/* those other files conditionally, to print trace statements. */
/* integer fsi, fso, fpi, fpo, fbi, fbo, pbin, fmsg, fdebug */
/* LPC order, Frame size, Quantization rate, Bits per frame, */
/* Error correction */
/* Subroutine SETUP is the only place where order is assigned a value, */
/* and that value is 10. It could increase efficiency 1% or so to */
/* declare order as a constant (i.e., a Fortran PARAMETER) instead of as
*/
/* a variable in a COMMON block, since it is used in many places in the */
/* core of the coding and decoding routines. Actually, I take that back.
*/
/* At least when compiling with f2c, the upper bound of DO loops is */
/* stored in a local variable before the DO loop begins, and then that is
*/
/* compared against on each iteration. */
/* Similarly for lframe, which is given a value of MAXFRM in SETUP. */
/* Similarly for quant, which is given a value of 2400 in SETUP. quant */
/* is used in only a few places, and never in the core coding and */
/* decoding routines, so it could be eliminated entirely. */
/* nbits is similar to quant, and is given a value of 54 in SETUP. */
/* corrp is given a value of .TRUE. in SETUP, and is only used in the */
/* subroutines ENCODE and DECODE. It doesn't affect the speed of the */
/* coder significantly whether it is .TRUE. or .FALSE., or whether it is
*/
/* a constant or a variable, since it is only examined once per frame. */
/* Leaving it as a variable that is set to .TRUE. seems like a good */
/* idea, since it does enable some error-correction capability for */
/* unvoiced frames, with no change in the coding rate, and no noticeable
*/
/* quality difference in the decoded speech. */
/* 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 */
/* Parameters/constants */
/* Voicing coefficient and Linear Discriminant Analysis variables:
*/
/* Max number of VDC's and VDC levels */
/* The following are not Fortran PARAMETER's, but they are */
/* initialized with DATA statements, and never modified. */
/* Actual number of VDC's and levels */
/* Local variables that need not be saved */
/* Note: */
/* VALUE(1) through VALUE(8) are assigned values, but VALUE(9) */
/* never is. Yet VALUE(9) is read in the loop that begins "DO I =
*/
/* 1, 9" below. I believe that this doesn't cause any problems in
*/
/* this subroutine, because all VDC(9,*) array elements are 0, and
*/
/* this is what is multiplied by VALUE(9) in all cases. Still, it
*/
/* would save a multiplication to change the loop to "DO I = 1, 8".
*/
/* Local state */
/* WARNING! */
/* VOICE, SFBUE, and SLBUE should be saved from one invocation to */
/* the next, but they are never given an initial value. */
/* Does Fortran 77 specify some default initial value, like 0, or */
/* is it undefined? If it is undefined, then this code should be */
/* corrected to specify an initial value. */
/* For VOICE, note that it is "shifted" in the statement that */
/* begins "IF (HALF .EQ. 1) THEN" below. Also, uninitialized */
/* values in the VOICE array can only affect entries in the VOIBUF
*/
/* array that are for the same frame, or for an older frame. Thus
*/
/* the effects of uninitialized values in VOICE cannot linger on */
/* for more than 2 or 3 frame times. */
/* For SFBUE and SLBUE, the effects of uninitialized values can */
/* linger on for many frame times, because their previous values */
/* are exponentially decayed. Thus it is more important to choose
*/
/* initial values for these variables. I would guess that a */
/* reasonable initial value for SFBUE is REF/16, the same as used */
/* for FBUE and OFBUE. Similarly, SLBUE can be initialized to */
/* REF/32, the same as for LBUE and OLBUE. */
/* These guessed initial values should be validated by re-running */
/* the modified program on some audio samples. */
/* Declare and initialize filters: */
dither = (&st->dither);
snr = (&st->snr);
maxmin = (&st->maxmin);
voice = (&st->voice[0]);
lbve = (&st->lbve);
lbue = (&st->lbue);
fbve = (&st->fbve);
fbue = (&st->fbue);
ofbue = (&st->ofbue);
olbue = (&st->olbue);
sfbue = (&st->sfbue);
slbue = (&st->slbue);
/* Parameter adjustments */
if (vwin) {
--vwin;
}
if (buflim) {
--buflim;
}
if (inbuf) {
inbuf_offset = buflim[1];
inbuf -= inbuf_offset;
}
if (lpbuf) {
lpbuf_offset = buflim[3];
lpbuf -= lpbuf_offset;
}
if (ivrc) {
--ivrc;
}
if (obound) {
--obound;
}
if (voibuf) {
--voibuf;
}
/* Function Body */
/* The following variables are saved from one invocation to the */
/* next, but are not initialized with DATA statements. This is */
/* acceptable, because FIRST is initialized ot .TRUE., and the */
/* first time that this subroutine is then called, they are all */
/* given initial values. */
/* SNR */
/* LBVE, LBUE, FBVE, FBUE, OFBUE, OLBUE */
/* MAXMIN is initialized on the first call, assuming that HALF */
/* .EQ. 1 on first call. This is how ANALYS calls this subroutine.
*/
/* Voicing Decision Parameter vector (* denotes zero coefficient): */
/* * MAXMIN */
/* LBE/LBVE */
/* ZC */
/* RC1 */
/* QS */
/* IVRC2 */
/* aR_B */
/* aR_F */
/* * LOG(LBE/LBVE) */
/* Define 2-D voicing decision coefficient vector according to the voicin
g*/
/* parameter order above. Each row (VDC vector) is optimized for a speci
fic*/
/* SNR. The last element of the vector is the constant. */
/* E ZC RC1 Qs IVRC2 aRb aRf c */
/* The VOICE array contains the result of the linear discriminant functio
n*/
/* (analog values). The VOIBUF array contains the hard-limited binary
*/
/* voicing decisions. The VOICE and VOIBUF arrays, according to FORTRAN
*/
/* memory allocation, are addressed as: */
/* (half-frame number, future-frame number) */
/* | Past | Present | Future1 | Future2 | */
/* | 1,0 | 2,0 | 1,1 | 2,1 | 1,2 | 2,2 | 1,3 | 2,3 | ---> time */
/* Update linear discriminant function history each frame: */
if (*half == 1) {
voice[0] = voice[2];
voice[1] = voice[3];
voice[2] = voice[4];
voice[3] = voice[5];
*maxmin = *maxamd / max(*minamd,1.f);
}
/* Calculate voicing parameters twice per frame: */
vparms_(&vwin[1], &inbuf[inbuf_offset], &lpbuf[lpbuf_offset], &buflim[1],
half, dither, mintau, &zc, &lbe, &fbe, &qs, &rc1, &ar_b__, &
ar_f__);
/* Estimate signal-to-noise ratio to select the appropriate VDC vector.
*/
/* The SNR is estimated as the running average of the ratio of the */
/* running average full-band voiced energy to the running average */
/* full-band unvoiced energy. SNR filter has gain of 63. */
r__1 = (*snr + *fbve / (real) max(*fbue,1)) * 63 / 64.f;
*snr = (real) i_nint(&r__1);
snr2 = *snr * *fbue / max(*lbue,1);
/* Quantize SNR to SNRL according to VDCL thresholds. */
snrl = 1;
i__1 = nvdcl - 1;
for (snrl = 1; snrl <= i__1; ++snrl) {
if (snr2 > vdcl[snrl - 1]) {
goto L69;
}
}
/* (Note: SNRL = NVDCL here) */
L69:
/* Linear discriminant voicing parameters: */
value[0] = *maxmin;
value[1] = (real) lbe / max(*lbve,1);
value[2] = (real) zc;
value[3] = rc1;
value[4] = qs;
value[5] = ivrc[2];
value[6] = ar_b__;
value[7] = ar_f__;
/* Evaluation of linear discriminant function: */
voice[*half + 3] = vdc[snrl * 10 - 1];
for (i__ = 1; i__ <= 8; ++i__) {
voice[*half + 3] += vdc[i__ + snrl * 10 - 11] * value[i__ - 1];
}
/* Classify as voiced if discriminant > 0, otherwise unvoiced */
/* Voicing decision for current half-frame: 1 = Voiced; 0 = Unvoiced */
if (voice[*half + 3] > 0.f) {
voibuf[*half + 6] = 1;
} else {
voibuf[*half + 6] = 0;
}
/* Skip voicing decision smoothing in first half-frame: */
/* Give a value to VSTATE, so that trace statements below will print
*/
/* a consistent value from one call to the next when HALF .EQ. 1. */
/* The value of VSTATE is not used for any other purpose when this is
*/
/* true. */
vstate = -1;
if (*half == 1) {
goto L99;
}
/* Voicing decision smoothing rules (override of linear combination): */
/* Unvoiced half-frames: At least two in a row. */
/* -------------------- */
/* Voiced half-frames: At least two in a row in one frame. */
/* ------------------- Otherwise at least three in a row. */
/* (Due to the way transition frames are encoded) */
/* In many cases, the discriminant function determines how to smooth. */
/* In the following chart, the decisions marked with a * may be overridden
.*/
/* Voicing override of transitions at onsets: */
/* If a V/UV or UV/V voicing decision transition occurs within one-half
*/
/* frame of an onset bounding a voicing window, then the transition is */
/* moved to occur at the onset. */
/* P 1F */
/* ----- ----- */
/* 0 0 0 0 */
/* 0 0 0* 1 (If there is an onset there) */
/* 0 0 1* 0* (Based on 2F and discriminant distance) */
/* 0 0 1 1 */
/* 0 1* 0 0 (Always) */
/* 0 1* 0* 1 (Based on discriminant distance) */
/* 0* 1 1 0* (Based on past, 2F, and discriminant distance) */
/* 0 1* 1 1 (If there is an onset there) */
/* 1 0* 0 0 (If there is an onset there) */
/* 1 0 0 1 */
/* 1 0* 1* 0 (Based on discriminant distance) */
/* 1 0* 1 1 (Always) */
/* 1 1 0 0 */
/* 1 1 0* 1* (Based on 2F and discriminant distance) */
/* 1 1 1* 0 (If there is an onset there) */
/* 1 1 1 1 */
/* Determine if there is an onset transition between P and 1F. */
/* OT (Onset Transition) is true if there is an onset between */
/* P and 1F but not after 1F. */
ot = ((obound[1] & 2) != 0 || obound[2] == 1) && (obound[3] & 1) == 0;
/* Multi-way dispatch on voicing decision history: */
vstate = (voibuf[3] << 3) + (voibuf[4] << 2) + (voibuf[5] << 1) + voibuf[
6];
switch (vstate + 1) {
case 1: goto L99;
case 2: goto L1;
case 3: goto L2;
case 4: goto L99;
case 5: goto L4;
case 6: goto L5;
case 7: goto L6;
case 8: goto L7;
case 9: goto L8;
case 10: goto L99;
case 11: goto L10;
case 12: goto L11;
case 13: goto L99;
case 14: goto L13;
case 15: goto L14;
case 16: goto L99;
}
L1:
if (ot && voibuf[7] == 1) {
voibuf[5] = 1;
}
goto L99;
L2:
if (voibuf[7] == 0 || voice[2] < -voice[3]) {
voibuf[5] = 0;
} else {
voibuf[6] = 1;
}
goto L99;
L4:
voibuf[4] = 0;
goto L99;
L5:
if (voice[1] < -voice[2]) {
voibuf[4] = 0;
} else {
voibuf[5] = 1;
}
goto L99;
/* VOIBUF(2,0) must be 0 */
L6:
if (voibuf[1] == 1 || voibuf[7] == 1 || voice[3] > voice[0]) {
voibuf[6] = 1;
} else {
voibuf[3] = 1;
}
goto L99;
L7:
if (ot) {
voibuf[4] = 0;
}
goto L99;
L8:
if (ot) {
voibuf[4] = 1;
}
goto L99;
L10:
if (voice[2] < -voice[1]) {
voibuf[5] = 0;
} else {
voibuf[4] = 1;
}
goto L99;
L11:
voibuf[4] = 1;
goto L99;
L13:
if (voibuf[7] == 0 && voice[3] < -voice[2]) {
voibuf[6] = 0;
} else {
voibuf[5] = 1;
}
goto L99;
L14:
if (ot && voibuf[7] == 0) {
voibuf[5] = 0;
}
/* GOTO 99 */
L99:
/* Now update parameters: */
/* ---------------------- */
/* During unvoiced half-frames, update the low band and full band unvoice
d*/
/* energy estimates (LBUE and FBUE) and also the zero crossing */
/* threshold (DITHER). (The input to the unvoiced energy filters is */
/* restricted to be less than 10dB above the previous inputs of the */
/* filters.) */
/* During voiced half-frames, update the low-pass (LBVE) and all-pass */
/* (FBVE) voiced energy estimates. */
if (voibuf[*half + 6] == 0) {
/* Computing MIN */
i__1 = fbe, i__2 = *ofbue * 3;
r__1 = (*sfbue * 63 + (min(i__1,i__2) << 3)) / 64.f;
*sfbue = i_nint(&r__1);
*fbue = *sfbue / 8;
*ofbue = fbe;
/* Computing MIN */
i__1 = lbe, i__2 = *olbue * 3;
r__1 = (*slbue * 63 + (min(i__1,i__2) << 3)) / 64.f;
*slbue = i_nint(&r__1);
*lbue = *slbue / 8;
*olbue = lbe;
} else {
r__1 = (*lbve * 63 + lbe) / 64.f;
*lbve = i_nint(&r__1);
r__1 = (*fbve * 63 + fbe) / 64.f;
*fbve = i_nint(&r__1);
}
/* Set dither threshold to yield proper zero crossing rates in the */
/* presence of low frequency noise and low level signal input. */
/* NOTE: The divisor is a function of REF, the expected energies. */
/* Computing MIN */
/* Computing MAX */
r__2 = (real)(sqrt((real) (*lbue * *lbve)) * 64 / 3000);
r__1 = max(r__2,1.f);
*dither = min(r__1,20.f);
/* Voicing decisions are returned in VOIBUF. */
return 0;
} /* voicin_ */