onset.c

sloedgy open sip stack source code

/*

$Log: onset.c,v $
Revision 1.1  2006/06/26 03:02:54  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 1.2  2002/02/15 03:57:55  yurik
Warnings removed during compilation, patch courtesy of Jehan Bing, [e-mail]

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

 * Revision 1.2  1996/08/20  20:37:55  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  22:31:18  jaf
 * Initial revision
 *

*/

#ifdef P_R_O_T_O_T_Y_P_E_S
extern int onset_(real *pebuf, integer *osbuf, integer *osptr, integer *oslen, integer *sbufl, integer *sbufh, integer *lframe, struct lpc10_encoder_state *st);
#endif

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

#include "f2c.h"

/* Table of constant values */

static real c_b2 = 1.f;

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

/* 	ONSET Version 49 

 * $Log: onset.c,v $
 * Revision 1.1  2006/06/26 03:02:54  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 1.2  2002/02/15 03:57:55  yurik
 * Warnings removed during compilation, patch courtesy of Jehan Bing, [e-mail]
 *
 * Revision 1.1  2000/06/05 04:45:12  robertj
 * Added LPC-10 2400bps codec
 *
 * Revision 1.2  1996/08/20  20:37:55  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  22:31:18  jaf
 * Initial revision
 * */
/* Revision 1.5  1996/03/15  16:41:01  jaf */
/* Just rearranged INITONSET assignment orders to be consistent with */
/* order of DATA statements in ONSET. */

/* Revision 1.4  1996/03/15  15:48:27  jaf */
/* Changed some comments, and only reordered the DATA statements (their */
/* meaning wasn't changed). */

/* Revision 1.3  1996/03/14  23:53:06  jaf */
/* Added an entry INITONSET that reinitializes the local state variables */
/* of subroutine ONSET. */

/* Rearranged quite a few comments, adding more explaining which */
/* arguments were inputs, and how the modified ones can be changed. */

/* Revision 1.2  1996/03/12  23:53:00  jaf */
/* Lots of comments added about the local state of this subroutine that */
/* must be saved from one invocation to the next. */

/* One constant 180 replaced with LFRAME, which should be "more general", */
/* even though it would probably require many more changes than this to */
/* get this coder to work for other frame sizes. */

/* Revision 1.1  1996/02/07 14:48:09  jaf */
/* Initial revision */


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

/* 	Floating point version */


/*   Detection of onsets in (or slightly preceding) the futuremost frame */
/*   of speech. */


/* Input: */
/*  PEBUF(SBUFL:SBUFH)  - Preemphasized speech */
/*                        Indices SBUFH-LFRAME through SBUFH are read. */
/*  OSLEN  - Maximum number of onsets that can be stored in OSBUF. */
/*  SBUFL, SBUFH        - Range of PEBUF */
/*  LFRAME              - length of a frame, in samples */
/* Input/Output: */
/*  OSBUF(OSLEN) - Buffer which holds sorted indexes of onsets */
/*                 Indices A through B are modified, where A */
/*                 is the original value of OSPTR, and B is the final */
/*                 value of OSPTR-1.  B is at most OSLEN. */
/*  OSPTR        - Free pointer into OSBUF */
/*                 Initial value should be .LE. OSLEN+1. */
/*                 If so, final value grows by one for each new onset */
/*                 found, and final value will be .LE. OSLEN+1. */

/* This subroutine maintains local state from one call to the next.  If */
/* you want to switch to using a new audio stream for this subroutine, or */
/* reinitialize its state for any other reason, call the ENTRY INITONSET. */

/* Subroutine */ int onset_(real *pebuf, integer *osbuf, integer *
	osptr, integer *oslen, integer *sbufl, integer *sbufh, integer *
	lframe, struct lpc10_encoder_state *st)
{
    /* Initialized data */

    real *n;
    real *d__;
    real *l2buf;
    real *l2sum1;
    integer *l2ptr1;
    integer *l2ptr2;
    logical *hyst;

    /* System generated locals */
    integer pebuf_offset, i__1;
    real r__1;

    /* Builtin functions */
    double r_sign(real *, real *);

    /* Local variables */
    integer i__;
    integer *lasti;
    real l2sum2;
    real *fpc;

/*       Arguments 
 * $Log: onset.c,v $
 * Revision 1.1  2006/06/26 03:02:54  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 1.2  2002/02/15 03:57:55  yurik
 * Warnings removed during compilation, patch courtesy of Jehan Bing, [e-mail]
 *
 * Revision 1.1  2000/06/05 04:45:12  robertj
 * Added LPC-10 2400bps codec
 *
 * Revision 1.2  1996/08/20  20:37:55  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  22:31:18  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 */
/*       Parameters/constants */
/*   Parameters for onset detection algorithm: */
/*    L2		Threshold for filtered slope of FPC (function of L2WID!) */
/*    L2LAG	Lag due to both filters which compute filtered slope of FPC */
/*    L2WID	Width of the filter which computes the slope of FPC */
/*    OSHYST	The number of samples of slope(FPC) which must be below */
/* 	        the threshold before a new onset may be declared. */
/*       Local variables that need not be saved */
/*       Local state */
/*   Variables */
/*    N, D       Numerator and denominator of prediction filters */
/*    FPC        Current prediction coefs */
/*    L2BUF, L2SUM1, L2SUM2    State of slope filter */
/*       The only "significant" change I've made is to change L2SUM2 out 
*/
/*       of the list of local variables that need to be saved, since it */
/*       didn't need to be. */
/*       L2SUM1 need not be, but avoiding saving it would require a small 
*/
/*       change to the body of the code.  See comments below for an */
/*       example of how the code could be changed to avoid saving L2SUM1. 
*/
/*       FPC and LASTI are saved from one invocation to the next, but */
/*       they are not given initial values.  This is acceptable, because 
*/
/*       FPC will be assigned a value the first time that this function */
/*       is called after D is initialized to 1, since the formula to */
/*       change D will not change it to 0 in one step, and the IF (D */
/*       .NE. 0) statement will execute its THEN part, initializing FPC. 
*/

/*       LASTI's value will not be used until HYST is .TRUE., and */
/*       whenever HYST is changed from its initial value of .FALSE., */
/*       LASTI is assigned a value. */
/*       In a C version of this coder, it would be nice if all of these */
/*       saved things, in this and all other subroutines, could be stored 
*/
/*       in a single struct lpc10_coder_state_t, initialized with a call 
*/
/*       to a function like lpc10_init(&lpc10_coder_state).  In this way, 
*/
/*       a program that used these functions could conveniently alternate 
*/
/*       coding more than one distinct audio stream. */

    n = &(st->n);
    d__ = &(st->d__);
    fpc = &(st->fpc);
    l2buf = &(st->l2buf[0]);
    l2sum1 = &(st->l2sum1);
    l2ptr1 = &(st->l2ptr1);
    l2ptr2 = &(st->l2ptr2);
    lasti = &(st->lasti);
    hyst = &(st->hyst);

    /* Parameter adjustments */
    if (osbuf) {
	--osbuf;
	}
    if (pebuf) {
	pebuf_offset = *sbufl;
	pebuf -= pebuf_offset;
	}

    /* Function Body */

/*       The following line subtracted a hard-coded "180" from LASTI, */
/*       instead of using a variable like LFRAME or a constant like */
/*       MAXFRM.  I changed it to LFRAME, for "generality". */
    if (*hyst) {
	*lasti -= *lframe;
    }
    i__1 = *sbufh;
    for (i__ = *sbufh - *lframe + 1; i__ <= i__1; ++i__) {
/*   Compute FPC; Use old FPC on divide by zero; Clamp FPC to +/- 1. 
*/
	*n = (pebuf[i__] * pebuf[i__ - 1] + (*n) * 63.f) / 64.f;
/* Computing 2nd power */
	r__1 = pebuf[i__ - 1];
	*d__ = (r__1 * r__1 + (*d__) * 63.f) / 64.f;
	if ((*d__) != 0.f) {
	    if (abs(*n) > (*d__)) {
		*fpc = (real)r_sign(&c_b2, n);
	    } else {
		*fpc = (*n) / (*d__);
	    }
	}
/*   Filter FPC */
/*       In order to allow L2SUM1 not to be saved from one invocation 
of */
/*       this subroutine to the next, one could change the sequence of
 */
/*       assignments below, up to the IF statement, to the following. 
 In */
/*       addition, the initial value of L2PTR2 should be changed to */
/*       L2WID/2 instead of L2WID/2+1. */

/*       L2SUM1 = L2BUF(L2PTR2) */
/*       L2PTR2 = MOD(L2PTR2,L2WID)+1 */
/*       L2SUM1 = L2SUM1 - L2BUF(L2PTR2) + FPC */
/*       L2BUF(L2PTR2) = L2SUM1 */

/* *       The following lines didn't change from the original: */
/*       L2SUM2 = L2BUF(L2PTR1) */
/*       L2BUF(L2PTR1) = FPC */
/*       L2PTR1 = MOD(L2PTR1,L2WID)+1 */

	l2sum2 = l2buf[*l2ptr1 - 1];
	*l2sum1 = *l2sum1 - l2buf[*l2ptr2 - 1] + *fpc;
	l2buf[*l2ptr2 - 1] = *l2sum1;
	l2buf[*l2ptr1 - 1] = *fpc;
	*l2ptr1 = *l2ptr1 % 16 + 1;
	*l2ptr2 = *l2ptr2 % 16 + 1;
	if ((r__1 = *l2sum1 - l2sum2, abs(r__1)) > 1.7f) {
	    if (! (*hyst)) {
/*   Ignore if buffer full */
		if (*osptr <= *oslen) {
		    osbuf[*osptr] = i__ - 9;
		    ++(*osptr);
		}
		*hyst = TRUE_;
	    }
	    *lasti = i__;
/*       After one onset detection, at least OSHYST sample times m
ust go */
/*       by before another is allowed to occur. */
	} else if ((*hyst) && i__ - *lasti >= 10) {
	    *hyst = FALSE_;
	}
    }
    return 0;
} /* onset_ */