util.c

来自「这是G.723和G.729的音频编解码的源代码」· C语言 代码 · 共 64 行

/* Version 2.0    Last modified: 6/30/95 */

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

#include "typedef.h"
#include "basic_op.h"
#include "count.h"

void 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;       move16();
   }

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


void 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];         move16();
   }

   return;
}
/* Random generator  */

#include "ld8k.h"

Word16 Random()
{
  static Word16 seed = 21845;

  /* seed = seed*31821 + 13849; */
  seed = extract_l(L_add(L_shr(L_mult(seed, 31821), 1), 13849L));

  move16();
  return(seed);

}