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    /*
    
    $Log$
    
    Revision 1.16  2004/06/26 03:50:14  markster
    Merge source cleanups (bug #1911)
    
    
    Revision 1.15  2003/09/27 02:45:37  markster
    Fix various compiler warnings (bug #322)
    
    Revision 1.2  2003/09/27 02:45:37  markster
    Fix various compiler warnings (bug #322)
    
    
    Revision 1.1.1.1  2003/02/12 13:59:15  matteo
    mer feb 12 14:56:57 CET 2003
    
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    Revision 1.2  2000/01/05 08:20:39  markster
    Some OSS fixes and a few lpc changes to make it actually work
    
     * Revision 1.2  1996/08/20  20:42:59  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  22:30:33  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"
    
    
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    #ifdef P_R_O_T_O_T_Y_P_E_S
    extern int synths_(integer *voice, integer *pitch, real *rms, real *rc, real *speech, integer *k, struct lpc10_decoder_state *st);
    /* comlen contrl_ 12 */
    /*:ref: pitsyn_ 14 12 4 4 4 6 6 4 4 4 6 6 4 6 */
    /*:ref: irc2pc_ 14 5 6 6 4 6 6 */
    /*:ref: bsynz_ 14 7 6 4 4 6 6 6 6 */
    /*:ref: deemp_ 14 2 6 4 */
    /*:ref: initpitsyn_ 14 0 */
    /*:ref: initbsynz_ 14 0 */
    /*:ref: initdeemp_ 14 0 */
    #endif
    
    /* Common Block Declarations */
    
    extern struct {
        integer order, lframe;
        logical corrp;
    } contrl_;
    
    #define contrl_1 contrl_
    
    /* Table of constant values */
    
    static real c_b2 = .7f;
    
    /* ***************************************************************** */
    
    /* 	SYNTHS Version 54 */
    
    /* $Log$
    
     * Revision 1.16  2004/06/26 03:50:14  markster
     * Merge source cleanups (bug #1911)
    
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     *
    
     * Revision 1.15  2003/09/27 02:45:37  markster
     * Fix various compiler warnings (bug #322)
     *
     * Revision 1.2  2003/09/27 02:45:37  markster
     * Fix various compiler warnings (bug #322)
     *
     * 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 08:20:39  markster
     * Some OSS fixes and a few lpc changes to make it actually work
     *
    
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     * Revision 1.2  1996/08/20  20:42:59  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  22:30:33  jaf
     * Initial revision
     * */
    /* Revision 1.5  1996/03/26  19:31:58  jaf */
    /* Commented out trace statements. */
    
    /* Revision 1.4  1996/03/25  19:41:01  jaf */
    /* Changed so that MAXFRM samples are always returned in the output array */
    /* SPEECH. */
    
    /* This required delaying the returned samples by MAXFRM sample times, */
    /* and remembering any "left over" samples returned by PITSYN from one */
    /* call of SYNTHS to the next. */
    
    /* Changed size of SPEECH from 2*MAXFRM to MAXFRM.  Removed local */
    /* variable SOUT.  Added local state variables BUF and BUFLEN. */
    
    /* Revision 1.3  1996/03/25  19:20:10  jaf */
    /* Added comments about the range of possible return values for argument */
    /* K, and increased the size of the arrays filled in by PITSYN from 11 to */
    /* 16, as has been already done inside of PITSYN. */
    
    /* Revision 1.2  1996/03/22  00:18:18  jaf */
    /* Added comments explaining meanings of input and output parameters, and */
    /* indicating which array indices can be read or written. */
    
    /* Added entry INITSYNTHS, which does nothing except call the */
    /* corresponding initialization entries for subroutines PITSYN, BSYNZ, */
    /* and DEEMP. */
    
    /* Revision 1.1  1996/02/07 14:49:44  jaf */
    /* Initial revision */
    
    
    /* ***************************************************************** */
    
    /* The note below is from the distributed version of the LPC10 coder. */
    /* The version of the code below has been modified so that SYNTHS always */
    /* has a constant frame length output of MAXFRM. */
    
    /* Also, BSYNZ and DEEMP need not be modified to work on variable */
    /* positions within an array.  It is only necessary to pass the first */
    /* index desired as the array argument.  What actually gets passed is the */
    /* address of that array position, which the subroutine treats as the */
    /* first index of the array. */
    
    /* This technique is used in subroutine ANALYS when calling PREEMP, so it */
    /* appears that multiple people wrote different parts of this LPC10 code, */
    /* and that they didn't necessarily have equivalent knowledge of Fortran */
    /* (not surprising). */
    
    /*  NOTE: There is excessive buffering here, BSYNZ and DEEMP should be */
    /*        changed to operate on variable positions within SOUT.  Also, */
    /*        the output length parameter is bogus, and PITSYN should be */
    /*        rewritten to allow a constant frame length output. */
    
    /* Input: */
    /*  VOICE  - Half frame voicing decisions */
    /*           Indices 1 through 2 read. */
    /* Input/Output: */
    /*  PITCH  - Pitch */
    /*           PITCH is restricted to range 20 to 156, inclusive, */
    /*           before calling subroutine PITSYN, and then PITSYN */
    /*           can modify it further under some conditions. */
    /*  RMS    - Energy */
    /*           Only use is for debugging, and passed to PITSYN. */
    /*           See comments there for how it can be modified. */
    /*  RC     - Reflection coefficients */
    /*           Indices 1 through ORDER restricted to range -.99 to .99, */
    /*           before calling subroutine PITSYN, and then PITSYN */
    /*           can modify it further under some conditions. */
    /* Output: */
    /*  SPEECH - Synthesized speech samples. */
    /*           Indices 1 through the final value of K are written. */
    /*  K      - Number of samples placed into array SPEECH. */
    /*           This is always MAXFRM. */
    
    /* Subroutine */ int synths_(integer *voice, integer *pitch, real *
    	rms, real *rc, real *speech, integer *k, struct lpc10_decoder_state *st)
    {
        /* Initialized data */
    
        real *buf;
        integer *buflen;
    
        /* System generated locals */
        integer i__1;
        real r__1, r__2;
    
        /* Local variables */
        real rmsi[16];
        integer nout, ivuv[16], i__, j;
        extern /* Subroutine */ int deemp_(real *, integer *, struct lpc10_decoder_state *);
        real ratio;
        integer ipiti[16];
        real g2pass;
        real pc[10];
        extern /* Subroutine */ int pitsyn_(integer *, integer *, integer *, real 
    	    *, real *, integer *, integer *, integer *, real *, real *, 
    	    integer *, real *, struct lpc10_decoder_state *);
        real rci[160]	/* was [10][16] */;
    
    /* $Log$
    
     * Revision 1.16  2004/06/26 03:50:14  markster
     * Merge source cleanups (bug #1911)
    
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     *
    
     * Revision 1.15  2003/09/27 02:45:37  markster
     * Fix various compiler warnings (bug #322)
     *
     * Revision 1.2  2003/09/27 02:45:37  markster
     * Fix various compiler warnings (bug #322)
     *
     * 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 08:20:39  markster
     * Some OSS fixes and a few lpc changes to make it actually work
     *
    
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     * Revision 1.2  1996/08/20  20:42:59  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  22:30:33  jaf
     * Initial revision
     * */
    /* Revision 1.3  1996/03/29  22:03:47  jaf */
    /* Removed definitions for any constants that were no longer used. */
    
    /* Revision 1.2  1996/03/26  19:34:33  jaf */
    /* Added comments indicating which constants are not needed in an */
    /* application that uses the LPC-10 coder. */
    
    /* Revision 1.1  1996/02/07  14:43:51  jaf */
    /* Initial revision */
    
    /*   LPC Configuration parameters: */
    /* Frame size, Prediction order, Pitch period */
    /*       Arguments */
    /* $Log$
    
     * Revision 1.16  2004/06/26 03:50:14  markster
     * Merge source cleanups (bug #1911)
    
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    Mark Spencer committed
     *
    
     * Revision 1.15  2003/09/27 02:45:37  markster
     * Fix various compiler warnings (bug #322)
     *
     * Revision 1.2  2003/09/27 02:45:37  markster
     * Fix various compiler warnings (bug #322)
     *
     * 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 08:20:39  markster
     * Some OSS fixes and a few lpc changes to make it actually work
     *
    
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     * Revision 1.2  1996/08/20  20:42:59  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  22:30:33  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 */
    /*       Local variables that need not be saved */
    /*       Local state */
    /*       BUF is a buffer of speech samples that would have been returned 
    */
    /*       by the older version of SYNTHS, but the newer version doesn't, */
    /*       so that the newer version can always return MAXFRM samples on */
    /*       every call.  This has the effect of delaying the return of */
    /*       samples for one additional frame time. */
    
    /*       Indices 1 through BUFLEN contain samples that are left over from 
    */
    /*       the last call to SYNTHS.  Given the way that PITSYN works, */
    /*       BUFLEN should always be in the range MAXFRM-MAXPIT+1 through */
    /*       MAXFRM, inclusive, after a call to SYNTHS is complete. */
    
    /*       On the first call to SYNTHS (or the first call after */
    /*       reinitializing with the entry INITSYNTHS), BUFLEN is MAXFRM, and 
    */
    /*       a frame of silence is always returned. */
        /* Parameter adjustments */
        if (voice) {
    	--voice;
    	}
        if (rc) {
    	--rc;
    	}
        if (speech) {
    	--speech;
    	}
    
        /* Function Body */
        buf = &(st->buf[0]);
        buflen = &(st->buflen);
    
    /* Computing MAX */
        i__1 = min(*pitch,156);
        *pitch = max(i__1,20);
        i__1 = contrl_1.order;
        for (i__ = 1; i__ <= i__1; ++i__) {
    /* Computing MAX */
    /* Computing MIN */
    	r__2 = rc[i__];
    	r__1 = min(r__2,.99f);
    	rc[i__] = max(r__1,-.99f);
        }
        pitsyn_(&contrl_1.order, &voice[1], pitch, rms, &rc[1], &contrl_1.lframe, 
    	    ivuv, ipiti, rmsi, rci, &nout, &ratio, st);
        if (nout > 0) {
    	i__1 = nout;
    	for (j = 1; j <= i__1; ++j) {
    
    /*             Add synthesized speech for pitch period J to the en
    d of */
    /*             BUF. */
    
    	    irc2pc_(&rci[j * 10 - 10], pc, &contrl_1.order, &c_b2, &g2pass);
    	    bsynz_(pc, &ipiti[j - 1], &ivuv[j - 1], &buf[*buflen], &rmsi[j - 1]
    		    , &ratio, &g2pass, st);
    	    deemp_(&buf[*buflen], &ipiti[j - 1], st);
    	    *buflen += ipiti[j - 1];
    	}
    
    /*          Copy first MAXFRM samples from BUF to output array SPEECH 
    */
    /*          (scaling them), and then remove them from the beginning of
     */
    /*          BUF. */
    
    	for (i__ = 1; i__ <= 180; ++i__) {
    	    speech[i__] = buf[i__ - 1] / 4096.f;
    	}
    	*k = 180;
    	*buflen += -180;
    	i__1 = *buflen;
    	for (i__ = 1; i__ <= i__1; ++i__) {
    	    buf[i__ - 1] = buf[i__ + 179];
    	}
        }
        return 0;
    } /* synths_ */