265 lines
8.4 KiB
C
265 lines
8.4 KiB
C
/*
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$Log: placev.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 2001/10/16 21:21:14 yurik
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Removed warnings on Windows CE. Submitted by 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 1.1 1996/08/19 22:31:02 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 placev_(integer *osbuf, integer *osptr, integer *oslen, integer *obound, integer *vwin, integer *af, integer *lframe, integer *minwin, integer *maxwin, integer *dvwinl, integer *dvwinh);
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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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/* PLACEV Version 48 */
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/* $Log: placev.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 2001/10/16 21:21:14 yurik
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* Removed warnings on Windows CE. Submitted by 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 1.1 1996/08/19 22:31:02 jaf
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* Initial revision
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*
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*/
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/* Revision 1.6 1996/03/19 20:42:19 jaf */
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/* Added some conditions satisfied by the output values in VWIN. */
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/* Revision 1.5 1996/03/19 18:37:56 jaf */
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/* Strengthened the specification of which indices of VWIN are read and */
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/* written. */
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/* Revision 1.4 1996/03/15 16:38:33 jaf */
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/* One tiny comment added. */
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/* Revision 1.3 1996/03/15 16:36:13 jaf */
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/* Added comments giving In/Out status of arguments. */
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/* Revision 1.2 1996/03/12 23:56:01 jaf */
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/* Comments added explaining that none of the local variables of this */
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/* subroutine need to be saved from one invocation to the next. */
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/* Revision 1.1 1996/02/07 14:48:39 jaf */
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/* Initial revision */
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/* ****************************************************************** */
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/* Input: */
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/* OSBUF Buffer which holds sorted indexes of onsets */
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/* I believe that only indices 1 through OSPTR-1 can be read. */
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/* OSLEN */
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/* OSPTR Free pointer into OSBUF */
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/* AF */
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/* LFRAME */
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/* MINWIN */
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/* MAXWIN */
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/* DVWINL */
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/* DVWINH (This argument is never used. Should it be?) */
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/* Input/Output: */
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/* VWIN Buffer of Voicing Window Positions (Modified) */
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/* Index (2,AF-1) is read. */
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/* Indices (1,AF) and (2,AF) are written, */
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/* and then possibly read. */
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/* All other indices are unused. */
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/* In all cases, the final values will satsify the condition:*/
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/* VWIN(2,AF)-VWIN(1,AF)+1 .LE. MAXWIN */
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/* I'm not certain yet, but they may also satisfy: */
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/* MINWIN .LE. VWIN(2,AF)-VWIN(1,AF)+1 */
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/* Output: */
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/* OBOUND This variable is set by this procedure and used */
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/* in placing analysis windows (PLACEA). Bit 1 */
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/* indicates whether an onset bounds the left side */
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/* of the voicing window, and bit 2 indicates whether */
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/* an onset bounds the right side of the voicing window. */
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/* This subroutine has no local state. */
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/* Subroutine */ int placev_(integer *osbuf, integer *osptr, integer *oslen,
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integer *obound, integer *vwin, integer *af, integer *lframe, integer
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*minwin, integer *maxwin, integer *dvwinl, integer *dvwinh)
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{
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/* System generated locals */
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integer i__1, i__2;
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/* Local variables */
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logical crit;
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integer i__, q, osptr1, hrange, lrange;
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/* Arguments */
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/* Local variables that need not be saved */
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/* Variables */
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/* LRANGE, HRANGE Range in which window is placed */
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/* OSPTR1 OSPTR excluding samples in 3F */
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/* Local state */
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/* None */
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/* Voicing Window Placement */
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/* __________________ __________________ ______________ */
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/* | | | */
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/* | 1F | 2F | 3F ... */
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/* |__________________|__________________|______________ */
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/* Previous | */
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/* Window | */
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/* ...________| */
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/* | | */
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/* ------>| This window's placement range |<------ */
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/* | | */
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/* There are three cases. Note that these are different from those */
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/* given in the LPC-10e phase 1 report. */
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/* 1. If there are no onsets in this range, then the voicing window */
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/* is centered in the pitch window. If such a placement is not within
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*/
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/* the window's placement range, then the window is placed in the left-
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*/
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/* most portion of the placement range. Its length is always MAXWIN. */
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/* 2. If the first onset is in 2F and there is sufficient room to place
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*/
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/* the window immediately before this onset, then the window is placed
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*/
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/* there, and its length is set to the maximum possible under these */
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/* constraints. */
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/* "Critical Region Exception": If there is another onset in 2F */
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/* such that a window can be placed between the two onsets, the */
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/* window is placed there (ie, as in case 3). */
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/* 3. Otherwise, the window is placed immediately after the onset. The
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*/
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/* window's length */
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/* is the longest length that can fit in the range under these constraint
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s,*/
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/* except that the window may be shortened even further to avoid overlapp
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ing*/
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/* other onsets in the placement range. In any case, the window's length
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*/
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/* is at least MINWIN. */
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/* Note that the values of MINWIN and LFRAME must be chosen such */
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/* that case 2 = false implies case 3 = true. This means that */
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/* MINWIN <= LFRAME/2. If this were not the case, then a fourth case */
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/* would have to be added for when the window cannot fit either before
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*/
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/* or after the onset. */
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/* Note also that onsets which weren't in 2F last time may be in 1F this
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*/
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/* time, due to the filter delays in computing onsets. The result is tha
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t*/
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/* occasionally a voicing window will overlap that onset. The only way
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*/
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/* to circumvent this problem is to add more delay in processing input
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*/
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/* speech. In the trade-off between delay and window-placement, window
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*/
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/* placement lost. */
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/* Compute the placement range */
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/* Parameter adjustments */
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--osbuf;
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vwin -= 3;
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/* Function Body */
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/* Computing MAX */
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i__1 = vwin[((*af - 1) << 1) + 2] + 1, i__2 = (*af - 2) * *lframe + 1;
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lrange = max(i__1,i__2);
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hrange = *af * *lframe;
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/* Compute OSPTR1, so the following code only looks at relevant onsets. */
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for (osptr1 = *osptr - 1; osptr1 >= 1; --osptr1) {
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if (osbuf[osptr1] <= hrange) {
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goto L90;
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}
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}
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L90:
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++osptr1;
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/* Check for case 1 first (fast case): */
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if (osptr1 <= 1 || osbuf[osptr1 - 1] < lrange) {
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/* Computing MAX */
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i__1 = vwin[((*af - 1) << 1) + 2] + 1;
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vwin[(*af << 1) + 1] = max(i__1,*dvwinl);
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vwin[(*af << 1) + 2] = vwin[(*af << 1) + 1] + *maxwin - 1;
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*obound = 0;
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} else {
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/* Search backward in OSBUF for first onset in range. */
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/* This code relies on the above check being performed first. */
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for (q = osptr1 - 1; q >= 1; --q) {
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if (osbuf[q] < lrange) {
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goto L100;
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}
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}
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L100:
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++q;
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/* Check for case 2 (placement before onset): */
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/* Check for critical region exception: */
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i__1 = osptr1 - 1;
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for (i__ = q + 1; i__ <= i__1; ++i__) {
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if (osbuf[i__] - osbuf[q] >= *minwin) {
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crit = TRUE_;
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goto L105;
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}
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}
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crit = FALSE_;
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L105:
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/* Computing MAX */
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i__1 = (*af - 1) * *lframe, i__2 = lrange + *minwin - 1;
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if (! crit && osbuf[q] > max(i__1,i__2)) {
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vwin[(*af << 1) + 2] = osbuf[q] - 1;
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/* Computing MAX */
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i__1 = lrange, i__2 = vwin[(*af << 1) + 2] - *maxwin + 1;
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vwin[(*af << 1) + 1] = max(i__1,i__2);
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*obound = 2;
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/* Case 3 (placement after onset) */
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} else {
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vwin[(*af << 1) + 1] = osbuf[q];
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L110:
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++q;
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if (q >= osptr1) {
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goto L120;
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}
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if (osbuf[q] > vwin[(*af << 1) + 1] + *maxwin) {
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goto L120;
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}
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if (osbuf[q] < vwin[(*af << 1) + 1] + *minwin) {
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goto L110;
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}
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vwin[(*af << 1) + 2] = osbuf[q] - 1;
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*obound = 3;
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return 0;
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L120:
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/* Computing MIN */
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i__1 = vwin[(*af << 1) + 1] + *maxwin - 1;
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vwin[(*af << 1) + 2] = min(i__1,hrange);
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*obound = 1;
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}
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}
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return 0;
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} /* placev_ */
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