lspmaq.c

完整的EVRC压缩解压缩算法源码,附带一个简单的例子程序。

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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:                1           */
/*      Static/Global RAM:  0               */
/*      Stack/Local RAM:    527             */
/*----------------------------------------------------------------------*/
/*********************************************************************************
*            *****   LSP matrix quantization  ************                       *
*                                                                                *
* Input Arguments                                                                *
* ***************                                                                *
* x		Input LSP matrix  x(ndimx,kdim), i.e., kdim rows of              *
*		ndimx elements.                                                  *
*		LSP vectors row by row.                                          *
* ndim		Actual vector dimension (LSP order).  ndim <= ndimx              *
* kdim		Number of LSP vectors, i.e., number of rows in the main matrix.  *
* many		Number of sub-matrices.                                          *
* nsub		Array containing "many" sub-matrices sizes. nsub(i) is the size  *
*		of the rows in the ith sub-matrix. Sum(i)[ nsub(i) ] = ndim      *
* book		(1D). Contains "many" codebooks in series. The ith codebook      *
*		contains matices of size kdim rows by nsub(i) columns.           *
*		i.e., kdim vectors of size nsub(i) in series.                    *
* alp		Weight adjustment factor.  alp=0  no weight                      *
*                                          alp >0 input is weighted              *
* nsiz		Contain "many" size values. nsiz(i) is the number of matrices    *
*		in codebook i.                                                   *
*                                                                                *
* Output arguments                                                               *
* ****************                                                               *
* y		Output matrix. The quantized version of x (same size).           *
* index		Contains "many" indices of the best matrix from each codebook    *
* d		Aux. array, at least the size of max( nsiz(i) )                  *
*                                                                                *
*********************************************************************************/
/*===========================================================================
                        INCLUDES
===========================================================================*/
#include <fcntl.h>
#include <stdio.h>
//#include <math.h>
#include "macro.h"
#include "rom.h"
#include "mathevrc.h"
#include "mathdp31.h"

/*===========================================================================
                        GLOBAL VARIABLES
===========================================================================*/

/*===========================================================================
                        FUNCTIONS
===========================================================================*/
void
    lspmaq(short *x, short ndim, short kdim, short many, short *nsub,
		   short *nsiz, short alp, short *y, short *index, short br, short *lsptab)
{
/*===========================================================================
                         LOCAL VARIABLE DECLARATIONS
===========================================================================*/
#define SCALED_OneDivPI2 5215
        static short df = MIN_LSP_SEP;
	register short i, j, m, im, jp, jm, jpm, jj;
	short dm;
	short d[2048];
	short shft_fctr[ORDER];
	long ltemp1;
	long ltemp2;
	short stemp1;
/*===========================================================================
                         START C CODE
===========================================================================*/
	jj = 0;

	/* Find weights */
	y[0] = sub(x[1], x[0]);

	y[ndim - 1] = sub(x[ndim - 1], x[ndim - 2]);

	for (i = 1; i < ndim - 1; i++)
		y[i] = Min(sub(x[i], x[i - 1]), sub(x[i + 1], x[i]));

	for (i = 0; i < ndim; i = add(i, 1))
	{
		if (y[i] != 0)
		{
			shft_fctr[i] = norm_s(y[i]);
			y[i] = shl(y[i], shft_fctr[i]);
			y[i] = add(mult(divide_s(alp, y[i]), SCALED_OneDivPI2),
					   shr(0x4000, shft_fctr[i] - 1));
		}
		else
		{
			y[i] = 18346;
			shft_fctr[i] = 4;
		}
	}
	/* Code all sub-matrices */
	im = 0;
	jp = 0;
	for (m = 0; m < many; m = add(m, 1))
	{
		for (j = 0; j < nsiz[m]; j = add(j, 1))
			d[j] = 0;

		for (j = 0; j < nsiz[m]; j = add(j, 1))
		{
			/* jm = km * j; */
			jm = shr(extract_l(L_mult(nsub[m], j)), 1);

			ltemp2 = 0;
			jpm = add(jp, jm);

			for (i = 0; i < nsub[m]; i++)
			{
				/* Rounding instead of extracting the high word
				 * in the following statements causes an error on 
				 * input frame 141 of enc_lspmaq.in (female).
				 */
				stemp1 = sub(x[i + im], lsptab[jpm + i]);
				ltemp1 = L_shl(L_mult(y[i + im], stemp1),
							   shft_fctr[i + im]);
				ltemp2 = L_add(ltemp2,
							   L_mult(extract_h(ltemp1),
									  stemp1));
			}

			d[j] = round32(ltemp2);
		}

		if (im > 0)
		{
			for (j = 0; j < nsiz[m]; j = add(j, 1))
			{
				jm = shr(extract_l(L_mult(nsub[m], j)), 1);
				jpm = add(jp, jm);

				if (lsptab[jpm] <= add(y[im - 1], df))
				{
					d[j] = 0x7FFF;
				}
			}
		}

		dm = 0x7FFF;

		for (j = 0; j < nsiz[m]; j = add(j, 1))
		{
			if (d[j] <= dm)
			{
				dm = d[j];
				jj = j;
			}
		}

		index[m] = jj;

		jpm = add(jp, shr(extract_l(L_mult(nsub[m], index[m])), 1));

		for (i = 0; i < nsub[m]; i = add(i, 1))
		{
			y[im + i] = lsptab[jpm + i];
		}

		im = add(im, nsub[m]);

		jp = add(jp, shr(extract_l(L_mult(nsub[m], nsiz[m])), 1));
	}
}								/* END MODULE lspmaq */

/***************************************************************************
* Routine name: lspmaq_dec                                                 *
* Function: VQ of line spectral frequencies - Decoder part.                *
* Inputs:                                                                  *
*         ndim	- Actual vector dimension (LSP order).                     *
*         kdim	- Number of LSP vectors, i.e., number of rows in the main  *
*                matrix.                                                   *
*         many	- Number of sub-matrices.                                  *
*         nsub	- Array containing "many" sub-matrices sizes. nsub(i) is   *
*                the size of the rows in the ith sub-matrix.               *
*                Sum(i)[ nsub(i) ] = ndim.                                 *
*         book	- (1D). Contains "many" codebooks in series. The ith       *
*                codebook contains matices of size kdim rows by nsub(i)    *
*                columns. i.e., kdim vectors of size nsub(i) in series.    *
*         alp	- Weight adjustment factor. alp=0 no weight. alp >0 input  *
*                is weighted.                                              *
*         nsiz	- Contain "many" size values. nsiz(i) is the number of     *
*                matrices in codebook i.                                   *
*                                                                          *
* Outputs: y	- Output matrix. The quantized version of x (same size).   *
*          index - Contains "many" indices of the best matrix from each    *
*                  codebook.                                               *
*                                                                          *
*                                                                          *
*  Program written by Dror Nahumi, Dep. 45370H                             *
***************************************************************************/
void lspmaq_dec(short ndim, short kdim, short many, short *nsub,
				short *nsiz, short *y, short *index, short br, short *lsptab)
{
	register int i, m, im, jp, jpm;

	/* Code all sub-matrices */
	im = 0;
	jp = 0;
	for (m = 0; m < many; m++)
	{
		jpm = add(jp, extract_l(L_shr(L_mult(nsub[m], index[m]), 1)));
		for (i = 0; i < nsub[m]; i++)
			y[im + i] = lsptab[jpm + i];
		im = add(im, nsub[m]);
		jp = add(jp, extract_l(L_shr(L_mult(nsub[m], nsiz[m]), 1)));
	}
}