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/*
* PCM time-domain equalizer
*
* Copyright (C) 2002-2005 Felipe Rivera <liebremx at users sourceforge net>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: iir.c,v 1.15 2005/10/17 01:57:59 liebremx Exp $
*/
#include <math.h>
#include "iir.h"
/* Coefficients */
sIIRCoefficients *iir_cf;
/* Volume gain
* values should be between 0.0 and 1.0
* Use the preamp from XMMS for now
* */
float preamp[EQ_CHANNELS];
#ifdef BENCHMARK
#include "benchmark.h"
double timex = 0.0;
int count = 0;
unsigned int blength = 0;
#endif
/*
* Global vars
*/
int rate;
int band_count;
void set_preamp(int chn, float val)
{
preamp[chn] = val;
}
/* Init the filters */
void init_iir()
{
calc_coeffs();
#if 0
band_count = cfg.band_num;
#endif
band_count = 10;
rate = 44100;
iir_cf = get_coeffs(&band_count, rate);
clean_history();
}
#ifdef ARCH_X86
/* Round function provided by Frank Klemm which saves around 100K
* CPU cycles in my PIII for each call to the IIR function with 4K samples
*/
__inline__ int round_trick(float floatvalue_to_round)
{
float floattmp ;
int rounded_value ;
floattmp = (int) 0x00FD8000L + (floatvalue_to_round);
rounded_value = *(int*)(&floattmp) - (int)0x4B7D8000L;
if ( rounded_value != (short) rounded_value )
rounded_value = ( rounded_value >> 31 ) ^ 0x7FFF;
return rounded_value;
}
#endif
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