g729ev_g729_util.c

最新的ITU-T的宽带语音编解码标准G.729.1,是对原先的G.729的最好的调整.码流输出速率可以进行自适应调整.满足未来通信要求.希望对大家有所帮助.

/* ITU-T G.729EV Optimization/Characterization Candidate                         */
/* Version:       1.0.a                                                          */
/* Revision Date: June 28, 2006                                                  */

/*
   ITU-T G.729EV Optimization/Characterization Candidate    ANSI-C Source Code
   Copyright (c) 2006 
   France Telecom, Matsushita Electric, Mindspeed, Siemens AG, ETRI, VoiceAge Corp.
   All rights reserved
*/

/*-------------------------------------------------------------------*
 * Function  Set zero()                                              *
 *           ~~~~~~~~~~                                              *
 * Set vector x[] to zero                                            *
 *-------------------------------------------------------------------*/

#include "stl.h"
#include "G729EV_G729_ld8k.h"
#include "G729EV_G729_DecStat.h"


void G729EV_G729_Set_zero(Word16 x[], /* (o)    : vector to clear     */
                          Word16 L    /* (i)    : length of vector    */
    )
{
  Word16    i;

  FOR(i = 0; i < L; i++)
  {
    x[i] = 0;
#ifdef WMOPS
    move16();
#endif
  }

  return;
}

/*-------------------------------------------------------------------*
 * Function  Copy:                                                   *
 *           ~~~~~                                                   *
 * Copy vector x[] to y[]                                            *
 *-------------------------------------------------------------------*/

void G729EV_G729_Copy(Word16 x[], /* (i)   : input vector   */
                      Word16 y[], /* (o)   : output vector  */
                      Word16 L    /* (i)   : vector length  */
    ) 
{
  Word16    i;

  FOR(i = 0; i < L; i++)
  {
    y[i] = x[i];
#ifdef WMOPS
    move16();
#endif
  }

  return;
}

/* Random generator  */

Word16 G729EV_G729_Random(Word16 * seed)
{
  /* seed = seed*31821 + 13849; */
  *seed = extract_l(L_add(L_shr(L_mult(*seed, 31821), 1), 13849L));
#ifdef WMOPS
  move16();
#endif

  return (*seed);
}