ref: e187dd1f838a8d63b8460cc8abbda85912ebef70
parent: 9bee769ba88a72b69915ed4a2062bfdf2fff67dd
author: menno <menno>
date: Sun Feb 25 13:41:16 EST 2001
Added calculation of KBD window
--- a/frontend/faacgui.dsp
+++ b/frontend/faacgui.dsp
@@ -25,7 +25,7 @@
# PROP AllowPerConfigDependencies 0
# PROP Scc_ProjName ""
# PROP Scc_LocalPath ""
-CPP=cl.exe
+CPP=xicl6.exe
MTL=midl.exe
RSC=rc.exe
@@ -51,7 +51,7 @@
BSC32=bscmake.exe
# ADD BASE BSC32 /nologo
# ADD BSC32 /nologo
-LINK32=link.exe
+LINK32=xilink6.exe
# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386
# ADD LINK32 libsndfile.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /machine:I386
# SUBTRACT LINK32 /profile
@@ -78,7 +78,7 @@
BSC32=bscmake.exe
# ADD BASE BSC32 /nologo
# ADD BSC32 /nologo
-LINK32=link.exe
+LINK32=xilink6.exe
# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /pdbtype:sept
# ADD LINK32 libsndfile.lib kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /debug /machine:I386 /pdbtype:sept
--- a/frontend/maingui.c
+++ b/frontend/maingui.c
@@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
- * $Id: maingui.c,v 1.5 2001/02/12 14:39:14 menno Exp $
+ * $Id: maingui.c,v 1.6 2001/02/25 18:41:16 menno Exp $
*/
#include <windows.h>
@@ -24,7 +24,7 @@
#include <commctrl.h>
#include <stdio.h>
-#include <sndfile.h>
+#include <sndfile.h> /* http://www.zip.com.au/~erikd/libsndfile/ */
#include "faac.h"
#include "resource.h"
--- a/libfaac/filtbank.c
+++ b/libfaac/filtbank.c
@@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
- * $Id: filtbank.c,v 1.2 2001/01/17 15:51:15 menno Exp $
+ * $Id: filtbank.c,v 1.3 2001/02/25 18:41:16 menno Exp $
*/
/*
@@ -35,10 +35,9 @@
#include "frame.h"
#include "fft.h"
-#include "kbd_win.h"
-
#define TWOPI 6.28318530717958647692
+
void FilterBankInit(faacEncHandle hEncoder)
{unsigned int i, channel;
@@ -51,13 +50,16 @@
hEncoder->sin_window_long = (double*)malloc(BLOCK_LEN_LONG*sizeof(double));
hEncoder->sin_window_short = (double*)malloc(BLOCK_LEN_SHORT*sizeof(double));
- hEncoder->kbd_window_long = kbd_window_long;
- hEncoder->kbd_window_short = kbd_window_short;
+ hEncoder->kbd_window_long = (double*)malloc(BLOCK_LEN_LONG*sizeof(double));
+ hEncoder->kbd_window_short = (double*)malloc(BLOCK_LEN_SHORT*sizeof(double));
for( i=0; i<BLOCK_LEN_LONG; i++ )
hEncoder->sin_window_long[i] = sin((M_PI/(2*BLOCK_LEN_LONG)) * (i + 0.5));
for( i=0; i<BLOCK_LEN_SHORT; i++ )
hEncoder->sin_window_short[i] = sin((M_PI/(2*BLOCK_LEN_SHORT)) * (i + 0.5));
+
+ CalculateKBDWindow(hEncoder->kbd_window_long, 4, BLOCK_LEN_LONG*2);
+ CalculateKBDWindow(hEncoder->kbd_window_short, 6, BLOCK_LEN_SHORT*2);
}
void FilterBankEnd(faacEncHandle hEncoder)
@@ -71,6 +73,8 @@
if (hEncoder->sin_window_long) free(hEncoder->sin_window_long);
if (hEncoder->sin_window_short) free(hEncoder->sin_window_short);
+ if (hEncoder->kbd_window_long) free(hEncoder->kbd_window_long);
+ if (hEncoder->kbd_window_short) free(hEncoder->kbd_window_short);
}
void FilterBank(faacEncHandle hEncoder,
@@ -187,6 +191,52 @@
xlowpass = (lowpass < specLen) ? lowpass : specLen ;
memset(freqBuff+xlowpass,0,(specLen-xlowpass)*sizeof(double));
+}
+
+static double Izero(double x)
+{+ const double IzeroEPSILON = 1E-41; /* Max error acceptable in Izero */
+ double sum, u, halfx, temp;
+ int n;
+
+ sum = u = n = 1;
+ halfx = x/2.0;
+ do {+ temp = halfx/(double)n;
+ n += 1;
+ temp *= temp;
+ u *= temp;
+ sum += u;
+ } while (u >= IzeroEPSILON*sum);
+
+ return(sum);
+}
+
+static void CalculateKBDWindow(double* win, double alpha, int length)
+{+ int i;
+ double IBeta;
+ double tmp;
+ double sum = 0.0;
+
+ alpha *= M_PI;
+ IBeta = 1.0/Izero(alpha);
+
+ /* calculate lower half of Kaiser Bessel window */
+ for(i=0; i<(length>>1); i++) {+ tmp = 4.0*(double)i/(double)length - 1.0;
+ win[i] = Izero(alpha*sqrt(1.0-tmp*tmp))*IBeta;
+ sum += win[i];
+ }
+
+ sum = 1.0/sum;
+ tmp = 0.0;
+
+ /* calculate lower half of window */
+ for(i=0; i<(length>>1); i++) {+ tmp += win[i];
+ win[i] = sqrt(tmp*sum);
+ }
}
static void MDCT(double *data, int N)
--- a/libfaac/filtbank.h
+++ b/libfaac/filtbank.h
@@ -16,7 +16,7 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
- * $Id: filtbank.h,v 1.3 2001/02/04 17:50:47 oxygene2000 Exp $
+ * $Id: filtbank.h,v 1.4 2001/02/25 18:41:16 menno Exp $
*/
#ifndef FILTBANK_H
@@ -58,6 +58,8 @@
int specLen
);
+static void CalculateKBDWindow(double* win, double alpha, int length);
+static double Izero(double x);
static void MDCT(double *data, int N);
static void IMDCT(double *data, int N);
--- a/libfaac/kbd_win.h
+++ /dev/null
@@ -1,1185 +1,0 @@
-/*
- * FAAC - Freeware Advanced Audio Coder
- * Copyright (C) 2001 Menno Bakker
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- * $Id: kbd_win.h,v 1.1 2001/01/17 11:21:40 menno Exp $
- */
-
-#ifndef _SHAPE_WIN_H_
-#define _SHAPE_WIN_H_
-
-double kbd_window_long[BLOCK_LEN_LONG] = {- 0.00029256153896361,
- 0.00042998567353047,
- 0.00054674074589540,
- 0.00065482304299792,
- 0.00075870195068747,
- 0.00086059331713336,
- 0.00096177541439010,
- 0.0010630609410878,
- 0.0011650036308132,
- 0.0012680012194148,
- 0.0013723517232956,
- 0.0014782864109136,
- 0.0015859901976719,
- 0.0016956148252373,
- 0.0018072876903517,
- 0.0019211179405514,
- 0.0020372007924215,
- 0.0021556206591754,
- 0.0022764534599614,
- 0.0023997683540995,
- 0.0025256290631156,
- 0.0026540948920831,
- 0.0027852215281403,
- 0.0029190616715331,
- 0.0030556655443223,
- 0.0031950812943391,
- 0.0033373553240392,
- 0.0034825325586930,
- 0.0036306566699199,
- 0.0037817702604646,
- 0.0039359150179719,
- 0.0040931318437260,
- 0.0042534609610026,
- 0.0044169420066964,
- 0.0045836141091341,
- 0.0047535159544086,
- 0.0049266858431214,
- 0.0051031617390698,
- 0.0052829813111335,
- 0.0054661819693975,
- 0.0056528008963682,
- 0.0058428750739943,
- 0.0060364413070882,
- 0.0062335362436492,
- 0.0064341963925079,
- 0.0066384581386503,
- 0.0068463577565218,
- 0.0070579314215715,
- 0.0072732152202559,
- 0.0074922451586909,
- 0.0077150571701162,
- 0.0079416871213115,
- 0.0081721708180857,
- 0.0084065440099458,
- 0.0086448423940363,
- 0.0088871016184291,
- 0.0091333572848345,
- 0.0093836449507939,
- 0.0096380001314086,
- 0.0098964583006517,
- 0.010159054892306,
- 0.010425825300561,
- 0.010696804880310,
- 0.010972028947167,
- 0.011251532777236,
- 0.011535351606646,
- 0.011823520630897,
- 0.012116075003993,
- 0.012413049837429,
- 0.012714480198999,
- 0.013020401111478,
- 0.013330847551161,
- 0.013645854446288,
- 0.013965456675352,
- 0.014289689065314,
- 0.014618586389712,
- 0.014952183366697,
- 0.015290514656976,
- 0.015633614861688,
- 0.015981518520214,
- 0.016334260107915,
- 0.016691874033817,
- 0.017054394638241,
- 0.017421856190380,
- 0.017794292885832,
- 0.018171738844085,
- 0.018554228105962,
- 0.018941794631032,
- 0.019334472294980,
- 0.019732294886947,
- 0.020135296106839,
- 0.020543509562604,
- 0.020956968767488,
- 0.021375707137257,
- 0.021799757987407,
- 0.022229154530343,
- 0.022663929872540,
- 0.023104117011689,
- 0.023549748833816,
- 0.024000858110398,
- 0.024457477495451,
- 0.024919639522613,
- 0.025387376602207,
- 0.025860721018295,
- 0.026339704925726,
- 0.026824360347160,
- 0.027314719170100,
- 0.027810813143900,
- 0.028312673876775,
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- 0.029333821328905,
- 0.029853170531859,
- 0.030378411455255,
- 0.030909574956490,
- 0.031446691733739,
- 0.031989792322926,
- 0.032538907094693,
- 0.033094066251369,
- 0.033655299823935,
- 0.034222637668991,
- 0.034796109465717,
- 0.035375744712844,
- 0.035961572725616,
- 0.036553622632758,
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-#endif
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