gsm/src/decode.c File Reference

#include <stdio.h>
#include "private.h"
#include "gsm.h"
#include "proto.h"

Include dependency graph for gsm/src/decode.c:

Go to the source code of this file.

Functions
static void Postprocessing	P2 ((S, s), struct gsm_state *S, register word *s)
void Gsm_Decoder	P8 ((S, LARcr, Ncr, bcr, Mcr, xmaxcr, xMcr, s), struct gsm_state *S, word *LARcr, word *Ncr, word *bcr, word *Mcr, word *xmaxcr, word *xMcr, word *s)

Function Documentation

P2()

static void Postprocessing P2 ( (S, s)  , struct gsm_state *  S, register word *  s  )

static

Definition at line 19 of file gsm/src/decode.c.

{
    register int        k;
    register word       msr = S->msr;
    register word       tmp;
 
    for (k = 160; k--; s++) {
        tmp = (word)GSM_MULT_R( msr, 28180 );
        msr = GSM_ADD(*s, tmp);        /* Deemphasis         */
        *s  = GSM_ADD(msr, msr) & 0xFFF8;  /* Truncation & Upscaling */
    }
    S->msr = msr;
}

References GSM_ADD(), GSM_MULT_R, S, and tmp().

P8()

void Gsm_Decoder P8	(	(S, LARcr, Ncr, bcr, Mcr, xmaxcr, xMcr, s)	,
		struct gsm_state *	S,
		word *	LARcr,
		word *	Ncr,
		word *	bcr,
		word *	Mcr,
		word *	xmaxcr,
		word *	xMcr,
		word *	s
	)

Definition at line 35 of file gsm/src/decode.c.

{
    int     j, k;
    word        erp[40], wt[160];
    word        * drp = S->dp0 + 120;
 
    for (j=0; j <= 3; j++, xmaxcr++, bcr++, Ncr++, Mcr++, xMcr += 13) {
 
        Gsm_RPE_Decoding( S, *xmaxcr, *Mcr, xMcr, erp );
        Gsm_Long_Term_Synthesis_Filtering( S, *Ncr, *bcr, erp, drp );
 
        for (k = 0; k <= 39; k++) wt[ j * 40 + k ] =  drp[ k ];
    }
 
    Gsm_Short_Term_Synthesis_Filter( S, LARcr, wt, s );
    Postprocessing(S, s);
}

References S.