RTL271_1/evrcc/code/mdfyorig.c

/**********************************************************************
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*******************************************************************/
 
/*======================================================================*/
/*     Enhanced Variable Rate Codec - Bit-Exact C Specification         */
/*     Copyright (C) 1997-1998 Telecommunications Industry Association. */
/*     All rights reserved.                                             */
/*----------------------------------------------------------------------*/
/* Note:  Reproduction and use of this software for the design and      */
/*     development of North American Wideband CDMA Digital              */
/*     Cellular Telephony Standards is authorized by the TIA.           */
/*     The TIA does not authorize the use of this software for any      */
/*     other purpose.                                                   */
/*                                                                      */
/*     The availability of this software does not provide any license   */
/*     by implication, estoppel, or otherwise under any patent rights   */
/*     of TIA member companies or others covering any use of the        */
/*     contents herein.                                                 */
/*                                                                      */
/*     Any copies of this software or derivative works must include     */
/*     this and all other proprietary notices.                          */
/*======================================================================*/
/*  Memory Usage:                                                       */
/*      ROM:                0                                           */
/*      Static/Global RAM:  24                                          */
/*      Stack/Local RAM:    141                                         */
/*----------------------------------------------------------------------*/
#include <stdio.h>
#include "e_globs.h"
#include "macro.h"
#include "mathadv.h"
#include "mathdp31.h"
//#include "mathevrc.h"
#include "dsp_math.h"
#include "mallocSw.h"
void modifyorig(INT16 *residualm,
				INT16 *accshift,
				INT16 beta,
				INT16 *dpm,
				INT16 shiftrange,
				INT16 resolution,
				INT16 *TARGET,
				INT16 *residual,
				INT16 dp,
				INT16 sfend)
{
	static INT16 FirstTime = 1;
	INT16 best;
	INT16 tmp;
	INT32 ex0y[(RSHIFT * 2 + 2) * RRESOLUTION + 1];	/* Fraction sampled correlation function */
	INT32 ex0y2[RSHIFT * 2 + 2];	/* Integer sampled correlation function */
	INT16 Residual[2 * SubFrameSize + 2 * RSHIFT + 1];
	static INT16 a1[RRESOLUTION];
	static INT16 a2[RRESOLUTION];
	static INT16 a3[RRESOLUTION];
	register INT16 i, j, k, n;
	INT16 sfstart, length, shiftrangel, shiftranger;
	INT32 e01, e02;
	INT16 shft_fctr1, shft_fctr2, shft_fctr3;
	INT32 ltmp;
	INT32 laccshift;
	INT32 y;

/****** INITIALIZATION *****/
	if (FirstTime)
	{
		FirstTime = 0;

		/* Calculate interpolation coefficients */
		a1[0] = 12288;
		a1[1] = 8448;
		a1[2] = 5120;
		a1[3] = 2304;
		a1[4] = 0;
		a1[5] = -1792;
		a1[6] = -3072;
		a1[7] = -3840;

		a2[0] = 24576;
		a2[1] = 28160;
		a2[2] = 30720;
		a2[3] = 32256;
		a2[4] = 32767;
		a2[5] = 32256;
		a2[6] = 30720;
		a2[7] = 28160;

		a3[0] = -4096;
		a3[1] = -3840;
		a3[2] = -3072;
		a3[3] = -1792;
		a3[4] = 0;
		a3[5] = 2304;
		a3[6] = 5120;
		a3[7] = 8448;
	}

	/********************
	* CORRELATION MATCH *
	********************/
	length = sub(sfend, dp);
	sfstart = dp;

	/*laccshift = L_shl(L_deposit_h(*accshift), 8); */
	laccshift = L_deposit_h(*accshift);		/* accshift scaled by 8 */
	/* Perform before if
	 * * statement.
	 */
	if (shiftrange != 0)
	{
		/* Limit the search range to control accshift */
		shiftrangel = shiftranger = shiftrange;
		if (*accshift < 0)
			shiftrangel = add(shiftrangel, 1);
		if (*accshift > 0)
			shiftranger = add(shiftranger, 1);

		tmp = abs_s(*accshift);
		/* For non-periodic signals */
		if ((beta < 6554 && tmp > 15 * 256) || (beta < 9830 && tmp > 30 * 256))
		{
			if (*accshift < 0)
				shiftranger = 1;
			else
				shiftrangel = 1;
		}

		if (add(shiftrangel, shr(*accshift, 8)) > 72)
		{
			shiftrangel = sub(72, shr(*accshift, 8));
			wfprintf(stderr, "mdfyorig:*** Buffer limit. shiftrangel is:%d\n", shiftrangel);
		}
		if (sub(shiftranger, shr(*accshift, 8)) > 72)
		{
			shiftranger = add(72, shr(*accshift, 8));
			wfprintf(stderr, "mdfyorig:*** Buffer limit. shiftranger is:%d\n", shiftranger);
		}

		/* Create a buffer of modify residual for match at low cut-off frequency */
		tmp = add(length, shiftrangel);
		tmp = add(tmp, shiftranger);

		ltmp = L_deposit_h(add(*accshift, shl(shiftrangel, 8)));
		for (i = 0; i <= tmp; i++)
		{
			/* POINTER ADDITION NOT CONVERTED -- NEED UNSIGNED ADDITION */
			bl_intrp(Residual + i, residual + dp + i, ltmp, 16384, 3);
		}

		tmp = add(shiftrangel, shiftranger);

		/* Search for all integer delays of residual */
		for (n = 0; n <= tmp; n++)
		{
			ex0y2[n] = 0;
			for (i = 0; i < length; i++)
			{
				ex0y2[n] = L_mac(ex0y2[n], Residual[n + i], TARGET[sfstart + i]);
			}
			ex0y2[n] = L_shr(ex0y2[n], 1);

		}

		/* Do quadratic interpolation of ex0y */
		for (n = 1, k = 0; n < shiftrangel + shiftranger; n++)
		{
			for (j = 0; j < resolution; j++)
			{
				ex0y[k] = L_mpy_ls(ex0y2[n - 1], a1[j]);
				ltmp = L_mpy_ls(ex0y2[n], a2[j]);
				ex0y[k] = L_add(ex0y[k], ltmp);
				ltmp = L_mpy_ls(ex0y2[n + 1], a3[j]);
				ex0y[k] = L_add(ex0y[k], ltmp);
				k++;
			}
		}

		/* Find maximum with positive correlation */
		y = 0;
		best = sub(shl(shiftrangel, 3), 4);
		for (n = 0; n < k; n++)
		{
			if (ex0y[n] > y)
			{
				y = ex0y[n];
				best = n;
			}
		}
/* best value not very accurate since ex0y[] calculation not percise. To correct
 * Residual[] should have more percision. This error does not seem to affect the
 * final output using the test data. 
 */
		/* Calculate energy in selected shift index */
		e01 = e02 = 0;
		for (i = shiftrangel; i < length + shiftrangel; i++)
			e01 = L_mac(e01, Residual[i], Residual[i]);

		for (i = 0; i < length; i++)
			e02 = L_mac(e02, TARGET[i + sfstart], TARGET[i + sfstart]);

		if (e01 == 0 || e02 == 0)
			y = 0;
		else
		{
			shft_fctr1 = norm_l(y);
			y = L_shl(y, shft_fctr1);
			y = L_mpy_ll(y, y);
			/* TO RECOVER Y VALUE:
			 * y = L_shl(y, 31-2*shft_fctr1) */

			shft_fctr2 = norm_l(e01);
			e01 = L_shl(e01, shft_fctr2);

			shft_fctr3 = norm_l(e02);
			e02 = L_shl(e02, shft_fctr3);
			ltmp = L_mpy_ll(e01, e02);
			ltmp = L_mpy_ls(ltmp, 16056);

			ltmp = L_shl(ltmp, shl(shft_fctr1, 1) - add(add(2, shft_fctr2), shft_fctr3));

			if (y > ltmp)
			{
				/*tmp = shl(shr(*accshift,8) + shiftrangel, 3) - (best + 4); */
				tmp = *accshift + shl(shiftrangel, 8) - shl((best + 4), 5);
                *accshift = tmp;
				laccshift = L_deposit_h(tmp);
/**accshift = shift_r(tmp, -3);*/
				/*
				 * if (laccshift == -75497472)
				 * laccshift = -88080384;
				 */
			}
		}
	}

	for (k = 0; k < length; k++)
	{
		bl_intrp(residualm + dp + k, residual + dp + k, laccshift, BLFREQ, BLPRECISION);

	}

	*dpm = add(dp, length);

}