www.pudn.com > AVS_M_ver10.rar > rnd_ph16.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
* license fee or royalty on an "as is" basis. The AVS disclaims
* any and all warranties, whether express, implied, or statutory,
* including any implied warranties of merchantability or of fitness
* 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.
*
* 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
* subject to royalty fees to patent holders. Information regarding
* the AVS patent policy is available from the AVS Web site at
* http://www.avs.org.cn
*
* THIS IS NOT A GRANT OF PATENT RIGHTS - SEE THE AVS PATENT POLICY.
************************************************************************
*/
/*------------------------------------------------------------------*
* function rnd_ph16 *
* ~~~~~~~~~~~~~~~~~ *
* phase random generator (16 phasef, output lg/2 real+imag) *
*------------------------------------------------------------------*/
#include "../include/amr_plus.h"
void rnd_ph16(short *seed, float *xri, int lg)
{
int i;
unsigned short phase;
for (i=0; i<lg; i+=2)
{
/* random phase from 0 to 15 */
phase = ((unsigned short)E_UTIL_random(seed)) >> 12;
xri[i] = sin20[phase+4];
xri[i+1] = sin20[phase];
}
return;
}