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;
}
