dyptrk.c

sloedgy open sip stack source code

/*

$Log: dyptrk.c,v $
Revision 1.1  2006/06/26 03:02:52  joegenbaclor
I have decided to include the latest development realease  of OPAL tagged Deimos Devel 1 (June 8 2006) as inegrated classes to opensipstack to avoid future version conflicts due to the fast pace in OPAL development.   This move is also aimed to reduce the size of projects using OPAL componets such as the soon to be relased OpenSIPPhone.

Revision 2.2  2005/08/08 03:28:42  dereksmithies
Eradicate all "/ * within comments" messages from GCC compilations.

Revision 2.1  2003/03/14 09:53:27  robertj
Updated to openH323 v1.11.7

Revision 1.1  2000/06/05 04:45:12  robertj
Added LPC-10 2400bps codec

 * Revision 1.2  1996/08/20  20:25:29  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  22:32:26  jaf
 * Initial revision
 *

*/

#ifdef P_R_O_T_O_T_Y_P_E_S
extern int dyptrk_(real *amdf, integer *ltau, integer *minptr, integer *voice, integer *pitch, integer *midx, struct lpc10_encoder_state *st);
/* comlen contrl_ 12 */
#endif

/*  -- translated by f2c (version 19951025).
   You must link the resulting object file with the libraries:
	-lf2c -lm   (in that order)
*/

#include "f2c.h"

/* Common Block Declarations */

extern struct {
    integer order, lframe;
    logical corrp;
} contrl_;

#define contrl_1 contrl_

/* ********************************************************************* */

/* 	DYPTRK Version 52 */

/*
 * $Log: dyptrk.c,v $
 * Revision 1.1  2006/06/26 03:02:52  joegenbaclor
 * I have decided to include the latest development realease  of OPAL tagged Deimos Devel 1 (June 8 2006) as inegrated classes to opensipstack to avoid future version conflicts due to the fast pace in OPAL development.   This move is also aimed to reduce the size of projects using OPAL componets such as the soon to be relased OpenSIPPhone.
 *
 * Revision 2.2  2005/08/08 03:28:42  dereksmithies
 * Eradicate all "/ * within comments" messages from GCC compilations.
 *
 * Revision 2.1  2003/03/14 09:53:27  robertj
 * Updated to openH323 v1.11.7
 *
 * Revision 1.1  2000/06/05 04:45:12  robertj
 * Added LPC-10 2400bps codec
 *
 * Revision 1.2  1996/08/20  20:25:29  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  22:32:26  jaf
 * Initial revision
 * */
/* Revision 1.5  1996/03/26  19:35:35  jaf */
/* Commented out trace statements. */

/* Revision 1.4  1996/03/19  18:03:22  jaf */
/* Replaced the initialization "DATA P/60*DEPTH*0/" with "DATA P/120*0/", */
/* because apparently Fortran (or at least f2c) can't handle expressions */
/* like that. */

/* Revision 1.3  1996/03/19  17:38:32  jaf */
/* Added comments about the local variables that should be saved from one */
/* invocation to the next.  None of them were given initial values in the */
/* original code, but from my testing, it appears that initializing them */
/* all to 0 works. */

/* Added entry INITDYPTRK to reinitialize these local variables. */

/* Revision 1.2  1996/03/13  16:32:17  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. */

/* Revision 1.1  1996/02/07 14:45:14  jaf */
/* Initial revision */


/* ********************************************************************* */

/*   Dynamic Pitch Tracker */

/* Input: */
/*  AMDF   - Average Magnitude Difference Function array */
/*           Indices 1 through LTAU read, and MINPTR */
/*  LTAU   - Number of lags in AMDF */
/*  MINPTR - Location of minimum AMDF value */
/*  VOICE  - Voicing decision */
/* Output: */
/*  PITCH  - Smoothed pitch value, 2 frames delayed */
/*  MIDX   - Initial estimate of current frame pitch */
/* Compile time constant: */
/*  DEPTH  - Number of frames to trace back */

/* 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 */
/* INITDYPTRK. */

/* Subroutine */ int dyptrk_(real *amdf, integer *ltau, integer *
	minptr, integer *voice, integer *pitch, integer *midx,
			       struct lpc10_encoder_state *st)
{
    /* Initialized data */

    real *s;
    integer *p;
    integer *ipoint;
    real *alphax;

    /* System generated locals */
    integer i__1;

    /* Local variables */
    integer pbar;
    real sbar;
    integer path[2], iptr, i__, j;
    real alpha, minsc, maxsc;

/*       Arguments
 * $Log: dyptrk.c,v $
 * Revision 1.1  2006/06/26 03:02:52  joegenbaclor
 * I have decided to include the latest development realease  of OPAL tagged Deimos Devel 1 (June 8 2006) as inegrated classes to opensipstack to avoid future version conflicts due to the fast pace in OPAL development.   This move is also aimed to reduce the size of projects using OPAL componets such as the soon to be relased OpenSIPPhone.
 *
 * Revision 2.2  2005/08/08 03:28:42  dereksmithies
 * Eradicate all "/ * within comments" messages from GCC compilations.
 *
 * Revision 2.1  2003/03/14 09:53:27  robertj
 * Updated to openH323 v1.11.7
 *
 * Revision 1.1  2000/06/05 04:45:12  robertj
 * Added LPC-10 2400bps codec
 *
 * Revision 1.2  1996/08/20  20:25:29  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  22:32:26  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 */
/*       Note that PATH is only used for debugging purposes, and can be */
/*       removed. */
/*       Local state */
/*       It would be a bit more "general" to define S(LTAU), if Fortran */
/*       allows the argument of a function to be used as the dimension of 
*/
/*       a local array variable. */
/*       IPOINT is always in the range 0 to DEPTH-1. */
/*       WARNING! */

/*       In the original version of this subroutine, IPOINT, ALPHAX, */
/*       every element of S, and potentially any element of P with the */
/*       second index value .NE. IPTR were read without being given */
/*       initial values (all indices of P with second index equal to */
/*       IPTR are all written before being read in this subroutine). */

/*       From examining the code carefully, it appears that all of these 
*/
/*       should be saved from one invocation to the next. */

/*       I've run lpcsim with the "-l 6" option to see all of the */
/*       debugging information that is printed out by this subroutine */
/*       below, and it appears that S, P, IPOINT, and ALPHAX are all */
/*       initialized to 0 (these initial values would likely be different 
*/
/*       on different platforms, compilers, etc.).  Given that the output 
*/
/*       of the coder sounds reasonable, I'm going to initialize these */
/*       variables to 0 explicitly. */

    s = &(st->s[0]);
    p = &(st->p[0]);
    ipoint = &(st->ipoint);
    alphax = &(st->alphax);


    /* Parameter adjustments */
    if (amdf) {
	--amdf;
	}

    /* Function Body */

/*   Calculate the confidence factor ALPHA, used as a threshold slope in 
*/
/*   SEESAW.  If unvoiced, set high slope so that every point in P array 
*/
/*  is marked as a potential pitch frequency.  A scaled up version (ALPHAX
)*/
/*   is used to maintain arithmetic precision. */
    if (*voice == 1) {
	*alphax = *alphax * .75f + amdf[*minptr] / 2.f;
    } else {
	*alphax *= .984375f;
    }
    alpha = *alphax / 16;
    if (*voice == 0 && *alphax < 128.f) {
	alpha = 8.f;
    }
/* SEESAW: Construct a pitch pointer array and intermediate winner functio
n*/
/*   Left to right pass: */
    iptr = *ipoint + 1;
    p[iptr * 60 - 60] = 1;
    i__ = 1;
    pbar = 1;
    sbar = s[0];
    i__1 = *ltau;
    for (i__ = 1; i__ <= i__1; ++i__) {
	sbar += alpha;
	if (sbar < s[i__ - 1]) {
	    s[i__ - 1] = sbar;
	    p[i__ + iptr * 60 - 61] = pbar;
	} else {
	    sbar = s[i__ - 1];
	    p[i__ + iptr * 60 - 61] = i__;
	    pbar = i__;
	}
    }
/*   Right to left pass: */
    i__ = pbar - 1;
    sbar = s[i__];
    while(i__ >= 1) {
	sbar += alpha;
	if (sbar < s[i__ - 1]) {
	    s[i__ - 1] = sbar;
	    p[i__ + iptr * 60 - 61] = pbar;
	} else {
	    pbar = p[i__ + iptr * 60 - 61];
	    i__ = pbar;
	    sbar = s[i__ - 1];
	}
	--i__;
    }
/*   Update S using AMDF */
/*   Find maximum, minimum, and location of minimum */
    s[0] += amdf[1] / 2;
    minsc = s[0];
    maxsc = minsc;
    *midx = 1;
    i__1 = *ltau;
    for (i__ = 2; i__ <= i__1; ++i__) {
	s[i__ - 1] += amdf[i__] / 2;
	if (s[i__ - 1] > maxsc) {
	    maxsc = s[i__ - 1];
	}
	if (s[i__ - 1] < minsc) {
	    *midx = i__;
	    minsc = s[i__ - 1];
	}
    }
/*   Subtract MINSC from S to prevent overflow */
    i__1 = *ltau;
    for (i__ = 1; i__ <= i__1; ++i__) {
	s[i__ - 1] -= minsc;
    }
    maxsc -= minsc;
/*   Use higher octave pitch if significant null there */
    j = 0;
    for (i__ = 20; i__ <= 40; i__ += 10) {
	if (*midx > i__) {
	    if (s[*midx - i__ - 1] < maxsc / 4) {
		j = i__;
	    }
	}
    }
    *midx -= j;
/*   TRACE: look back two frames to find minimum cost pitch estimate */
    j = *ipoint;
    *pitch = *midx;
    for (i__ = 1; i__ <= 2; ++i__) {
	j = j % 2 + 1;
	*pitch = p[*pitch + j * 60 - 61];
	path[i__ - 1] = *pitch;
    }

/*       The following statement subtracts one from IPOINT, mod DEPTH.  I 
*/
/*       think the author chose to add DEPTH-1, instead of subtracting 1, 
*/
/*       because then it will work even if MOD doesn't work as desired on 
*/
/*       negative arguments. */

    *ipoint = (*ipoint + 1) % 2;
    return 0;
} /* dyptrk_ */