/*
* JBoss, Home of Professional Open Source
* Copyright 2011, Red Hat, Inc. and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.restcomm.media.codec.g729;
public class DecGain {
float past_qua_en[]=new float[]{(float)-14.0,(float)-14.0,(float)-14.0,(float)-14.0};
public void dec_gain(
int index, /* input : quantizer index */
float code[], /* input : fixed code book vector */
int l_subfr, /* input : subframe size */
int bfi, /* input : bad frame indicator good = 0 */
FloatPointer gain_pit, /* output: quantized acb gain */
FloatPointer gain_code /* output: quantized fcb gain */
)
{
int index1,index2;
float g_code;
FloatPointer gcode0 = new FloatPointer();
/*----------------- Test erasure ---------------*/
if (bfi != 0)
{
gain_pit.value *= (float)0.9;
if(gain_pit.value > (float)0.9) gain_pit.value=(float)0.9;
gain_code.value *= (float)0.98;
/*----------------------------------------------*
* update table of past quantized energies *
* (frame erasure) *
*----------------------------------------------*/
GainPred.gain_update_erasure(past_qua_en);
return;
}
/*-------------- Decode pitch gain ---------------*/
index1 = TabLD8k.imap1[index/LD8KConstants.NCODE2] ;
index2 = TabLD8k.imap2[index%LD8KConstants.NCODE2] ;
gain_pit.value = TabLD8k.gbk1[index1][0]+TabLD8k.gbk2[index2][0] ;
/*-------------- Decode codebook gain ---------------*/
/*---------------------------------------------------*
*- energy due to innovation -*
*- predicted energy -*
*- predicted codebook gain => gcode0[exp_gcode0] -*
*---------------------------------------------------*/
GainPred.gain_predict( past_qua_en, code, l_subfr, gcode0);
/*-----------------------------------------------------------------*
* *gain_code = (gbk1[indice1][1]+gbk2[indice2][1]) * gcode0; *
*-----------------------------------------------------------------*/
g_code = TabLD8k.gbk1[index1][1]+TabLD8k.gbk2[index2][1];
gain_code.value = g_code * gcode0.value;
/*----------------------------------------------*
* update table of past quantized energies *
*----------------------------------------------*/
GainPred.gain_update( past_qua_en, g_code);
return;
}
}