newmdct.c

音频编码

/*
 *	MP3 window subband -> subband filtering -> mdct routine
 *
 *	Copyright (c) 1999-2000 Takehiro Tominaga
 *
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

/*
 *         Special Thanks to Patrick De Smet for your advices.
 */

/* $Id: newmdct.c,v 1.29.2.1 2005/11/20 14:08:25 bouvigne Exp $ */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "util.h"
#include "l3side.h"
#include "newmdct.h"

#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif

#define SCALE (32768.0/ 2.384e-06)

#ifndef USE_GOGO_SUBBAND
static const FLOAT enwindow[] = 
{
      -4.77e-07*0.740951125354959/2.384e-06,  1.03951e-04*0.740951125354959/2.384e-06,  9.53674e-04*0.740951125354959/2.384e-06, 2.841473e-03*0.740951125354959/2.384e-06,
  3.5758972e-02*0.740951125354959/2.384e-06, 3.401756e-03*0.740951125354959/2.384e-06,  9.83715e-04*0.740951125354959/2.384e-06,   9.9182e-05*0.740951125354959/2.384e-06, /* 15*/
     1.2398e-05*0.740951125354959/2.384e-06,  1.91212e-04*0.740951125354959/2.384e-06, 2.283096e-03*0.740951125354959/2.384e-06,1.6994476e-02*0.740951125354959/2.384e-06,
 -1.8756866e-02*0.740951125354959/2.384e-06,-2.630711e-03*0.740951125354959/2.384e-06, -2.47478e-04*0.740951125354959/2.384e-06,  -1.4782e-05*0.740951125354959/2.384e-06,
      9.063471690191471e-01,
      1.960342806591213e-01,


      -4.77e-07*0.773010453362737/2.384e-06,  1.05858e-04*0.773010453362737/2.384e-06,  9.30786e-04*0.773010453362737/2.384e-06, 2.521515e-03*0.773010453362737/2.384e-06,
  3.5694122e-02*0.773010453362737/2.384e-06, 3.643036e-03*0.773010453362737/2.384e-06,  9.91821e-04*0.773010453362737/2.384e-06,   9.6321e-05*0.773010453362737/2.384e-06, /* 14*/
     1.1444e-05*0.773010453362737/2.384e-06,  1.65462e-04*0.773010453362737/2.384e-06, 2.110004e-03*0.773010453362737/2.384e-06,1.6112804e-02*0.773010453362737/2.384e-06,
 -1.9634247e-02*0.773010453362737/2.384e-06,-2.803326e-03*0.773010453362737/2.384e-06, -2.77042e-04*0.773010453362737/2.384e-06,  -1.6689e-05*0.773010453362737/2.384e-06,
      8.206787908286602e-01,
      3.901806440322567e-01,


      -4.77e-07*0.803207531480645/2.384e-06,  1.07288e-04*0.803207531480645/2.384e-06,  9.02653e-04*0.803207531480645/2.384e-06, 2.174854e-03*0.803207531480645/2.384e-06,
  3.5586357e-02*0.803207531480645/2.384e-06, 3.858566e-03*0.803207531480645/2.384e-06,  9.95159e-04*0.803207531480645/2.384e-06,   9.3460e-05*0.803207531480645/2.384e-06, /* 13*/
     1.0014e-05*0.803207531480645/2.384e-06,  1.40190e-04*0.803207531480645/2.384e-06, 1.937389e-03*0.803207531480645/2.384e-06,1.5233517e-02*0.803207531480645/2.384e-06,
 -2.0506859e-02*0.803207531480645/2.384e-06,-2.974033e-03*0.803207531480645/2.384e-06, -3.07560e-04*0.803207531480645/2.384e-06,  -1.8120e-05*0.803207531480645/2.384e-06,
      7.416505462720353e-01,
      5.805693545089249e-01,


      -4.77e-07*0.831469612302545/2.384e-06,  1.08242e-04*0.831469612302545/2.384e-06,  8.68797e-04*0.831469612302545/2.384e-06, 1.800537e-03*0.831469612302545/2.384e-06,
  3.5435200e-02*0.831469612302545/2.384e-06, 4.049301e-03*0.831469612302545/2.384e-06,  9.94205e-04*0.831469612302545/2.384e-06,   9.0599e-05*0.831469612302545/2.384e-06, /* 12*/
      9.060e-06*0.831469612302545/2.384e-06,  1.16348e-04*0.831469612302545/2.384e-06, 1.766682e-03*0.831469612302545/2.384e-06,1.4358521e-02*0.831469612302545/2.384e-06,
 -2.1372318e-02*0.831469612302545/2.384e-06, -3.14188e-03*0.831469612302545/2.384e-06, -3.39031e-04*0.831469612302545/2.384e-06,  -1.9550e-05*0.831469612302545/2.384e-06,
      6.681786379192989e-01,
      7.653668647301797e-01,


      -4.77e-07*0.857728610000272/2.384e-06,  1.08719e-04*0.857728610000272/2.384e-06,  8.29220e-04*0.857728610000272/2.384e-06, 1.399517e-03*0.857728610000272/2.384e-06,
  3.5242081e-02*0.857728610000272/2.384e-06, 4.215240e-03*0.857728610000272/2.384e-06,  9.89437e-04*0.857728610000272/2.384e-06,   8.7261e-05*0.857728610000272/2.384e-06, /* 11*/
      8.106e-06*0.857728610000272/2.384e-06,   9.3937e-05*0.857728610000272/2.384e-06, 1.597881e-03*0.857728610000272/2.384e-06,1.3489246e-02*0.857728610000272/2.384e-06,
 -2.2228718e-02*0.857728610000272/2.384e-06,-3.306866e-03*0.857728610000272/2.384e-06, -3.71456e-04*0.857728610000272/2.384e-06,  -2.1458e-05*0.857728610000272/2.384e-06,
      5.993769336819237e-01,
      9.427934736519954e-01,


      -4.77e-07*0.881921264348355/2.384e-06,  1.08719e-04*0.881921264348355/2.384e-06,   7.8392e-04*0.881921264348355/2.384e-06,  9.71317e-04*0.881921264348355/2.384e-06,
  3.5007000e-02*0.881921264348355/2.384e-06, 4.357815e-03*0.881921264348355/2.384e-06,  9.80854e-04*0.881921264348355/2.384e-06,   8.3923e-05*0.881921264348355/2.384e-06, /* 10*/
      7.629e-06*0.881921264348355/2.384e-06,   7.2956e-05*0.881921264348355/2.384e-06, 1.432419e-03*0.881921264348355/2.384e-06,1.2627602e-02*0.881921264348355/2.384e-06,
 -2.3074150e-02*0.881921264348355/2.384e-06,-3.467083e-03*0.881921264348355/2.384e-06, -4.04358e-04*0.881921264348355/2.384e-06,  -2.3365e-05*0.881921264348355/2.384e-06,
      5.345111359507916e-01,
      1.111140466039205e+00,


      -9.54e-07*0.903989293123443/2.384e-06,  1.08242e-04*0.903989293123443/2.384e-06,  7.31945e-04*0.903989293123443/2.384e-06,  5.15938e-04*0.903989293123443/2.384e-06,
  3.4730434e-02*0.903989293123443/2.384e-06, 4.477024e-03*0.903989293123443/2.384e-06,  9.68933e-04*0.903989293123443/2.384e-06,   8.0585e-05*0.903989293123443/2.384e-06, /* 9*/
      6.676e-06*0.903989293123443/2.384e-06,   5.2929e-05*0.903989293123443/2.384e-06, 1.269817e-03*0.903989293123443/2.384e-06,1.1775017e-02*0.903989293123443/2.384e-06,
 -2.3907185e-02*0.903989293123443/2.384e-06,-3.622532e-03*0.903989293123443/2.384e-06, -4.38213e-04*0.903989293123443/2.384e-06,  -2.5272e-05*0.903989293123443/2.384e-06,
      4.729647758913199e-01,
      1.268786568327291e+00,


      -9.54e-07*0.92387953251128675613/2.384e-06,  1.06812e-04*0.92387953251128675613/2.384e-06,  6.74248e-04*0.92387953251128675613/2.384e-06,   3.3379e-05*0.92387953251128675613/2.384e-06,
  3.4412861e-02*0.92387953251128675613/2.384e-06, 4.573822e-03*0.92387953251128675613/2.384e-06,  9.54151e-04*0.92387953251128675613/2.384e-06,   7.6771e-05*0.92387953251128675613/2.384e-06,
      6.199e-06*0.92387953251128675613/2.384e-06,   3.4332e-05*0.92387953251128675613/2.384e-06, 1.111031e-03*0.92387953251128675613/2.384e-06,1.0933399e-02*0.92387953251128675613/2.384e-06,
 -2.4725437e-02*0.92387953251128675613/2.384e-06,-3.771782e-03*0.92387953251128675613/2.384e-06, -4.72546e-04*0.92387953251128675613/2.384e-06,  -2.7657e-05*0.92387953251128675613/2.384e-06,
      4.1421356237309504879e-01,  /* tan(PI/8) */
      1.414213562373095e+00,


      -9.54e-07*0.941544065183021/2.384e-06,  1.05381e-04*0.941544065183021/2.384e-06,  6.10352e-04*0.941544065183021/2.384e-06, -4.75883e-04*0.941544065183021/2.384e-06,
  3.4055710e-02*0.941544065183021/2.384e-06, 4.649162e-03*0.941544065183021/2.384e-06,  9.35555e-04*0.941544065183021/2.384e-06,   7.3433e-05*0.941544065183021/2.384e-06, /* 7*/
      5.245e-06*0.941544065183021/2.384e-06,   1.7166e-05*0.941544065183021/2.384e-06,  9.56535e-04*0.941544065183021/2.384e-06,1.0103703e-02*0.941544065183021/2.384e-06,
 -2.5527000e-02*0.941544065183021/2.384e-06,-3.914356e-03*0.941544065183021/2.384e-06, -5.07355e-04*0.941544065183021/2.384e-06,  -3.0041e-05*0.941544065183021/2.384e-06,
      3.578057213145241e-01,
      1.546020906725474e+00,


      -9.54e-07*0.956940335732209/2.384e-06,  1.02520e-04*0.956940335732209/2.384e-06,  5.39303e-04*0.956940335732209/2.384e-06,-1.011848e-03*0.956940335732209/2.384e-06,
  3.3659935e-02*0.956940335732209/2.384e-06, 4.703045e-03*0.956940335732209/2.384e-06,  9.15051e-04*0.956940335732209/2.384e-06,   7.0095e-05*0.956940335732209/2.384e-06, /* 6*/
      4.768e-06*0.956940335732209/2.384e-06,     9.54e-07*0.956940335732209/2.384e-06,  8.06808e-04*0.956940335732209/2.384e-06, 9.287834e-03*0.956940335732209/2.384e-06,
 -2.6310921e-02*0.956940335732209/2.384e-06,-4.048824e-03*0.956940335732209/2.384e-06, -5.42164e-04*0.956940335732209/2.384e-06,  -3.2425e-05*0.956940335732209/2.384e-06,
      3.033466836073424e-01,
      1.662939224605090e+00,


     -1.431e-06*0.970031253194544/2.384e-06,   9.9182e-05*0.970031253194544/2.384e-06,  4.62532e-04*0.970031253194544/2.384e-06,-1.573563e-03*0.970031253194544/2.384e-06,
  3.3225536e-02*0.970031253194544/2.384e-06, 4.737377e-03*0.970031253194544/2.384e-06,  8.91685e-04*0.970031253194544/2.384e-06,   6.6280e-05*0.970031253194544/2.384e-06,  /* 5*/
      4.292e-06*0.970031253194544/2.384e-06,  -1.3828e-05*0.970031253194544/2.384e-06,  6.61850e-04*0.970031253194544/2.384e-06, 8.487225e-03*0.970031253194544/2.384e-06,
 -2.7073860e-02*0.970031253194544/2.384e-06,-4.174709e-03*0.970031253194544/2.384e-06, -5.76973e-04*0.970031253194544/2.384e-06,  -3.4809e-05*0.970031253194544/2.384e-06,
      2.504869601913055e-01,
      1.763842528696710e+00,


     -1.431e-06*0.98078528040323/2.384e-06,   9.5367e-05*0.98078528040323/2.384e-06,  3.78609e-04*0.98078528040323/2.384e-06,-2.161503e-03*0.98078528040323/2.384e-06,
  3.2754898e-02*0.98078528040323/2.384e-06, 4.752159e-03*0.98078528040323/2.384e-06,  8.66413e-04*0.98078528040323/2.384e-06,   6.2943e-05*0.98078528040323/2.384e-06, /* 4*/
      3.815e-06*0.98078528040323/2.384e-06,   -2.718e-05*0.98078528040323/2.384e-06,  5.22137e-04*0.98078528040323/2.384e-06, 7.703304e-03*0.98078528040323/2.384e-06,
 -2.7815342e-02*0.98078528040323/2.384e-06,-4.290581e-03*0.98078528040323/2.384e-06, -6.11782e-04*0.98078528040323/2.384e-06,  -3.7670e-05*0.98078528040323/2.384e-06,
      1.989123673796580e-01,
      1.847759065022573e+00,


     -1.907e-06*0.989176509964781/2.384e-06,   9.0122e-05*0.989176509964781/2.384e-06,  2.88486e-04*0.989176509964781/2.384e-06,-2.774239e-03*0.989176509964781/2.384e-06,
  3.2248020e-02*0.989176509964781/2.384e-06, 4.748821e-03*0.989176509964781/2.384e-06,  8.38757e-04*0.989176509964781/2.384e-06,   5.9605e-05*0.989176509964781/2.384e-06, /* 3*/
      3.338e-06*0.989176509964781/2.384e-06,  -3.9577e-05*0.989176509964781/2.384e-06,  3.88145e-04*0.989176509964781/2.384e-06, 6.937027e-03*0.989176509964781/2.384e-06,
 -2.8532982e-02*0.989176509964781/2.384e-06,-4.395962e-03*0.989176509964781/2.384e-06, -6.46591e-04*0.989176509964781/2.384e-06,  -4.0531e-05*0.989176509964781/2.384e-06,
      1.483359875383474e-01,
      1.913880671464418e+00,


     -1.907e-06*0.995184726672197/2.384e-06,   8.4400e-05*0.995184726672197/2.384e-06,  1.91689e-04*0.995184726672197/2.384e-06,-3.411293e-03*0.995184726672197/2.384e-06,
  3.1706810e-02*0.995184726672197/2.384e-06, 4.728317e-03*0.995184726672197/2.384e-06,  8.09669e-04*0.995184726672197/2.384e-06,    5.579e-05*0.995184726672197/2.384e-06,
      3.338e-06*0.995184726672197/2.384e-06,  -5.0545e-05*0.995184726672197/2.384e-06,  2.59876e-04*0.995184726672197/2.384e-06, 6.189346e-03*0.995184726672197/2.384e-06,
 -2.9224873e-02*0.995184726672197/2.384e-06,-4.489899e-03*0.995184726672197/2.384e-06, -6.80923e-04*0.995184726672197/2.384e-06,  -4.3392e-05*0.995184726672197/2.384e-06,
      9.849140335716425e-02,
      1.961570560806461e+00,


     -2.384e-06*0.998795456205172/2.384e-06,   7.7724e-05*0.998795456205172/2.384e-06,   8.8215e-05*0.998795456205172/2.384e-06,-4.072189e-03*0.998795456205172/2.384e-06,
      3.1132698e-02*0.998795456205172/2.384e-06, 4.691124e-03*0.998795456205172/2.384e-06,  7.79152e-04*0.998795456205172/2.384e-06,   5.2929e-05*0.998795456205172/2.384e-06,
      2.861e-06*0.998795456205172/2.384e-06,  -6.0558e-05*0.998795456205172/2.384e-06,  1.37329e-04*0.998795456205172/2.384e-06, 5.462170e-03*0.998795456205172/2.384e-06,
      -2.9890060e-02*0.998795456205172/2.384e-06,-4.570484e-03*0.998795456205172/2.384e-06, -7.14302e-04*0.998795456205172/2.384e-06,  -4.6253e-05*0.998795456205172/2.384e-06,
      4.912684976946725e-02,
      1.990369453344394e+00,


      3.5780907e-02 * SQRT2*0.5/2.384e-06,1.7876148e-02 * SQRT2*0.5/2.384e-06, 3.134727e-03 * SQRT2*0.5/2.384e-06, 2.457142e-03 * SQRT2*0.5/2.384e-06,
      9.71317e-04 * SQRT2*0.5/2.384e-06,  2.18868e-04 * SQRT2*0.5/2.384e-06,  1.01566e-04 * SQRT2*0.5/2.384e-06,   1.3828e-05 * SQRT2*0.5/2.384e-06,

      3.0526638e-02/2.384e-06, 4.638195e-03/2.384e-06,  7.47204e-04/2.384e-06,   4.9591e-05/2.384e-06,
      4.756451e-03/2.384e-06,   2.1458e-05/2.384e-06,  -6.9618e-05/2.384e-06,/*    2.384e-06/2.384e-06*/
};
#endif


#define NS 12
#define NL 36

static const FLOAT win[4][NL] = {
  {
    2.382191739347913e-13,
    6.423305872147834e-13,
    9.400849094049688e-13,
    1.122435026096556e-12,
    1.183840321267481e-12,
    1.122435026096556e-12,
    9.400849094049690e-13,
    6.423305872147839e-13,
    2.382191739347918e-13,

    5.456116108943412e-12,
    4.878985199565852e-12,
    4.240448995017367e-12,
    3.559909094758252e-12,
    2.858043359288075e-12,
    2.156177623817898e-12,
    1.475637723558783e-12,
    8.371015190102974e-13,
    2.599706096327376e-13,

    -5.456116108943412e-12,
    -4.878985199565852e-12,
    -4.240448995017367e-12,
    -3.559909094758252e-12,
    -2.858043359288076e-12,
    -2.156177623817898e-12,
    -1.475637723558783e-12,
    -8.371015190102975e-13,
    -2.599706096327376e-13,

    -2.382191739347923e-13,
    -6.423305872147843e-13,
    -9.400849094049696e-13,
    -1.122435026096556e-12,
    -1.183840321267481e-12,
    -1.122435026096556e-12,
    -9.400849094049694e-13,
    -6.423305872147840e-13,
    -2.382191739347918e-13,
  },
  {
    2.382191739347913e-13,
    6.423305872147834e-13,
    9.400849094049688e-13,
    1.122435026096556e-12,
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