/*****************************************************************************/
/* This software module was originally developed by                          */
/*   Naoki Iwakami (NTT)                                                     */
/* and edited by                                                             */
/*   Naoki Iwakami and Satoshi Miki (NTT) on 1996-05-01,                     */
/*   Naoki Iwakami (NTT) on 1996-08-27,                                      */
/*   Naoki Iwakami (NTT) on 1997-04-18,                                      */
/* in the course of development of the                                       */
/* MPEG-2 NBC/MPEG-4 Audio standard ISO/IEC 13818-7, 14496-1,2 and 3.        */
/* This software module is an implementation of a part of one or more        */
/* MPEG-2 NBC/MPEG-4 Audio tools as specified by the MPEG-2 NBC/MPEG-4 Audio */
/* standard. ISO/IEC  gives users of the MPEG-2 NBC/MPEG-4 Audio standards   */
/* free license to this software module or modifications thereof for use in  */
/* hardware or software products claiming conformance to the MPEG-2 NBC/     */
/* MPEG-4 Audio  standards. Those intending to use this software module in   */
/* hardware or software products are advised that this use may infringe      */
/* existing patents. The original developer of this software module and      */
/* his/her company, the subsequent editors and their companies, and ISO/IEC  */
/* have no liability for use of this software module or modifications        */
/* thereof in an implementation. Copyright is not released for non           */
/* MPEG-2 NBC/MPEG-4 Audio conforming products. The original developer       */
/* retains full right to use the code for his/her  own purpose, assign or    */
/* donate the code to a third party and to inhibit third party from using    */
/* the code for non MPEG-2 NBC/MPEG-4 Audio conforming products.             */
/* This copyright notice must be included in all copies or derivative works. */
/* Copyright (c)1996.                                                        */
/*****************************************************************************/

/* 18-apr-97  NI  merged long, medium, & short procedure into single module */

#include "ntt_conf.h"

void ntt_tf_requantize_spectrum(/* Input */
				ntt_INDEX *indexp,
				/* Output */
				double flat_spectrum[])
{
  int    vq_bits, bits_avail_fr, bits_side_info, n_sf, cb_len_max;
  double *sp_cv0, *sp_cv1;
  static int used_bits = 0;
  
  /*--- Parameter settings ---*/
  switch(indexp->w_type){
  case ONLY_LONG_WINDOW:
  case LONG_SHORT_WINDOW:
  case SHORT_LONG_WINDOW:
  case LONG_MEDIUM_WINDOW:
  case MEDIUM_LONG_WINDOW:
    /* available bits */
    vq_bits = ntt_VQTOOL_BITS;
    /* codebooks */
    sp_cv0 = (double *)ntt_codev0; sp_cv1 = (double *)ntt_codev1;
    cb_len_max = ntt_CB_LEN_READ + ntt_CB_LEN_MGN;
    /* number of subframes in a frame */
    n_sf = ntt_N_SUP;
    break;
  case ONLY_MEDIUM_WINDOW:
  case MEDIUM_SHORT_WINDOW:
  case SHORT_MEDIUM_WINDOW:
    /* available bits */
    vq_bits = ntt_VQTOOL_BITS_M;
    /* codebooks */
    sp_cv0 = (double *)ntt_codev0m; sp_cv1 = (double *)ntt_codev1m;
    cb_len_max = ntt_CB_LEN_READ_M + ntt_CB_LEN_MGN;
    /* number of subframes in a frame */
    n_sf = ntt_N_SUP * ntt_N_MID;
    break;
  case ONLY_SHORT_WINDOW:
    /* available bits */
    vq_bits = ntt_VQTOOL_BITS_S;
    /* codebooks */
    sp_cv0 = (double *)ntt_codev0s; sp_cv1 = (double *)ntt_codev1s;
    cb_len_max = ntt_CB_LEN_READ_S + ntt_CB_LEN_MGN;
    /* number of subframes in a frame */
    n_sf = ntt_N_SUP * ntt_N_SHRT;
    break;
  default:
    fprintf(stderr, "ntt_tf_requantize_spectrum(): %d: No such window type.\n",
	    indexp->w_type);
    exit(1);
  }
  
  /*--- Reconstruction ---*/
  ntt_vex_pn(indexp->wvq,
	     sp_cv0, sp_cv1, cb_len_max,
	     n_sf, ntt_N_FR*ntt_N_SUP,
	     vq_bits,
	     flat_spectrum);
}
