www.pudn.com > AVS_M_ver10.rar > q_gain2p.c

/* 
*********************************************************************** 
* COPYRIGHT AND WARRANTY INFORMATION 
* 
* Copyright 2007  Audio Video Coding Standard, Part ¢ú 
* 
* This software module was developed by AVS Audio sub-group 
* 
* DISCLAIMER OF WARRANTY 
* 
* These software programs are available to the users without any 
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* for a particular purpose. In no event shall the contributors or  
* the AVS be liable for any incidental, punitive, or consequential 
* damages of any kind whatsoever arising from the use of this program. 
* 
* This disclaimer of warranty extends to the user of this program 
* and user's customers, employees, agents, transferees, successors, 
* and assigns. 
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* The AVS does not represent or warrant that the program furnished 
* hereunder are free of infringement of any third-party patents. 
* Commercial implementations of AVS, including shareware, may be 
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*/ 
 
/*-------------------------------------------------------------------------* 
 * procedure q_gain2_plus                                                  * 
 * ~~~~~~~~~~~~~~~~~~~~~~                                                  * 
 * Quantization of pitch and codebook gains.                               * 
 * The following routines is Q_gains updated for AMR_WB_PLUS.              * 
 * MA prediction is removed and MEAN_ENER is now quantized with 2 bits and * 
 * transmitted once every ACELP frame to the gains decoder.                * 
 * The pitch gain and the code gain are vector quantized and the           * 
 * mean-squared weighted error criterion is used in the quantizer search.  * 
 *-------------------------------------------------------------------------*/ 
#include  
#include  
#include "../include/amr_plus.h" 
#define RANGE         64 
int q_gain2_plus(   /* (o)  : index of quantizer                      */ 
  float code[],     /* (i)  : Innovative code vector                  */ 
  int lcode,        /* (i)  : Subframe size                           */ 
  float *gain_pit,  /* (i/o): Pitch gain / Quantized pitch gain       */ 
  float *gain_code, /* (i/o): code gain / Quantized codebook gain     */ 
  float *coeff,     /* (i)  : correlations , -2,        */ 
                    /*                , -2 and 2 */ 
  float mean_ener,  /* (i)  : mean_ener defined in open-loop (2 bits) */ 
  float *g0         /* (o)  : 'correction factor'                     */ 
) 
{ 
  int   i, indice=0, min_ind, size; 
  float ener_code, gcode0; 
  float dist, dist_min, g_pitch, g_code; 
  const float *t_qua_gain, *p; 
/*-----------------------------------------------------------------* 
 * - Find the initial quantization pitch index                     * 
 * - Set gains search range                                        * 
 *-----------------------------------------------------------------*/ 
  t_qua_gain = E_ROM_qua_gain7b; 
  p = (const float *) (E_ROM_qua_gain7b + RANGE);       /* pt at 1/4th of table */ 
  min_ind = 0; 
  g_pitch = *gain_pit; 
  for (i=0; i<(NB_QUA_GAIN7B-RANGE); i++, p+=2) { 
    if (g_pitch > *p) { 
      min_ind++; 
    } 
  } 
  size = RANGE; 
  min_ind=0; 
  size=128;              
  /* innovation energy (without gain) */ 
  ener_code = 0.01F; 
  for(i=0; i