chanwr.c

sloedgy open sip stack source code

/*

$Log: chanwr.c,v $
Revision 1.1  2006/06/26 03:02:51  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 03:28:41  dereksmithies
Eradicate all "/ * within comments" messages from GCC compilations.

Revision 2.1  2003/03/14 09:53:26  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  20:20:24  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.
 *
 * Revision 1.1  1996/08/19  22:40:31  jaf
 * Initial revision
 *

*/

#ifdef P_R_O_T_O_T_Y_P_E_S
extern int chanwr_(integer *order, integer *ipitv, integer *irms, integer *irc, integer *ibits, struct lpc10_encoder_state *st);
extern int chanrd_(integer *order, integer *ipitv, integer *irms, integer *irc, integer *ibits);
#endif

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

#include "f2c.h"

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

/* 	CHANL Version 49 */

/*
 * $Log: chanwr.c,v $
 * Revision 1.1  2006/06/26 03:02:51  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 03:28:41  dereksmithies
 * Eradicate all "/ * within comments" messages from GCC compilations.
 *
 * Revision 2.1  2003/03/14 09:53:26  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  20:20:24  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.
 *
 * Revision 1.1  1996/08/19  22:40:31  jaf
 * Initial revision
 * */
/* Revision 1.3  1996/03/21  15:14:57  jaf */
/* Added comments about which indices of argument arrays are read or */
/* written, and about the one bit of local state in CHANWR.  CHANRD */
/* has no local state. */

/* Revision 1.2  1996/03/13  18:55:10  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. */

/* Revision 1.1  1996/02/07 14:43:31  jaf */
/* Initial revision */


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

/* CHANWR: */
/*   Place quantized parameters into bitstream */

/* Input: */
/*  ORDER  - Number of reflection coefficients (not really variable) */
/*  IPITV  - Quantized pitch/voicing parameter */
/*  IRMS   - Quantized energy parameter */
/*  IRC    - Quantized reflection coefficients */
/*           Indices 1 through ORDER read. */
/* Output: */
/*  IBITS  - Serial bitstream */
/*           Indices 1 through 54 written. */
/*           Bit 54, the SYNC bit, alternates from one call to the next. */

/* Subroutine CHANWR maintains one bit of local state from one call to */
/* the next, in the variable ISYNC.  I believe that this one bit is only */
/* intended to allow a receiver to resynchronize its interpretation of */
/* the bit stream, by looking for which of the 54 bits alternates every */
/* frame time.  This is just a simple framing mechanism that is not */
/* useful when other, higher overhead framing mechanisms are used to */
/* transmit the coded frames. */

/* I'm not going to make an entry to reinitialize this bit, since it */
/* doesn't help a receiver much to know whether the first sync bit is a 0 */
/* or a 1.  It needs to examine several frames in sequence to have */
/* reasonably good assurance that its framing is correct. */


/* CHANRD: */
/*   Reconstruct parameters from bitstream */

/* Input: */
/*  ORDER  - Number of reflection coefficients (not really variable) */
/*  IBITS  - Serial bitstream */
/*           Indices 1 through 53 read (SYNC bit is ignored). */
/* Output: */
/*  IPITV  - Quantized pitch/voicing parameter */
/*  IRMS   - Quantized energy parameter */
/*  IRC    - Quantized reflection coefficients */
/*           Indices 1 through ORDER written */

/* Entry CHANRD has no local state. */



/*   IBITS is 54 bits of LPC data ordered as follows: */
/* 	R1-0, R2-0, R3-0,  P-0,  A-0, */
/* 	R1-1, R2-1, R3-1,  P-1,  A-1, */
/* 	R1-2, R4-0, R3-2,  A-2,  P-2, R4-1, */
/* 	R1-3, R2-2, R3-3, R4-2,  A-3, */
/* 	R1-4, R2-3, R3-4, R4-3,  A-4, */
/* 	 P-3, R2-4, R7-0, R8-0,  P-4, R4-4, */
/* 	R5-0, R6-0, R7-1,R10-0, R8-1, */
/* 	R5-1, R6-1, R7-2, R9-0,  P-5, */
/* 	R5-2, R6-2,R10-1, R8-2,  P-6, R9-1, */
/* 	R5-3, R6-3, R7-3, R9-2, R8-3, SYNC */
/* Subroutine */ int chanwr_0_(int n__, integer *order, integer *ipitv, 
	integer *irms, integer *irc, integer *ibits,
			       struct lpc10_encoder_state *st)
{
    /* Initialized data */

    integer *isync;
    static integer bit[10] = { 2,4,8,8,8,8,16,16,16,16 };
    static integer iblist[53] = { 13,12,11,1,2,13,12,11,1,2,13,10,11,2,1,10,
	    13,12,11,10,2,13,12,11,10,2,1,12,7,6,1,10,9,8,7,4,6,9,8,7,5,1,9,8,
	    4,6,1,5,9,8,7,5,6 };

    /* System generated locals */
    integer i__1;

    /* Local variables */
    integer itab[13], i__;

/*       Arguments */
/*       Parameters/constants */
/*       These arrays are not Fortran PARAMETER's, but they are defined */
/*       by DATA statements below, and their contents are never altered. 
*/
/*       Local variables that need not be saved */
/*       Local state */
/*       ISYNC is only used by CHANWR, not by ENTRY CHANRD. */

    /* Parameter adjustments */
    --irc;
    --ibits;

    /* Function Body */
    switch(n__) {
	case 1: goto L_chanrd;
	}

    isync = &(st->isync);

/* ***********************************************************************
 */
/* 	Place quantized parameters into bitstream */
/* ***********************************************************************
 */
/*   Place parameters into ITAB */
    itab[0] = *ipitv;
    itab[1] = *irms;
    itab[2] = 0;
    i__1 = *order;
    for (i__ = 1; i__ <= i__1; ++i__) {
	itab[i__ + 2] = irc[*order + 1 - i__] & 32767;
    }
/*   Put 54 bits into IBITS array */
    for (i__ = 1; i__ <= 53; ++i__) {
	ibits[i__] = itab[iblist[i__ - 1] - 1] & 1;
	itab[iblist[i__ - 1] - 1] /= 2;
    }
    ibits[54] = *isync & 1;
    *isync = 1 - *isync;
    return 0;
/* ***********************************************************************
 */
/* 	Reconstruct parameters from bitstream */
/* ***********************************************************************
 */

L_chanrd:
/*   Reconstruct ITAB */
    for (i__ = 1; i__ <= 13; ++i__) {
	itab[i__ - 1] = 0;
    }
    for (i__ = 1; i__ <= 53; ++i__) {
	itab[iblist[54 - i__ - 1] - 1] = (itab[iblist[54 - i__ - 1] - 1] << 1)
		 + ibits[54 - i__];
    }
/*   Sign extend RC's */
    i__1 = *order;
    for (i__ = 1; i__ <= i__1; ++i__) {
	if ((itab[i__ + 2] & bit[i__ - 1]) != 0) {
	    itab[i__ + 2] -= bit[i__ - 1] << 1;
	}
    }
/*   Restore variables */
    *ipitv = itab[0];
    *irms = itab[1];
    i__1 = *order;
    for (i__ = 1; i__ <= i__1; ++i__) {
	irc[i__] = itab[*order + 4 - i__ - 1];
    }
    return 0;
} /* chanwr_ */

/* Subroutine */ int chanwr_(integer *order, integer *ipitv, integer *irms, 
	integer *irc, integer *ibits, struct lpc10_encoder_state *st)
{
    return chanwr_0_(0, order, ipitv, irms, irc, ibits, st);
    }

/* Subroutine */ int chanrd_(integer *order, integer *ipitv, integer *irms, 
	integer *irc, integer *ibits)
{
    return chanwr_0_(1, order, ipitv, irms, irc, ibits, 0);
    }