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/*
* PCM time-domain equalizer
*
* Copyright (C) 2002-2006 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.h,v 1.13 2006/01/15 00:26:32 liebremx Exp $
*/
#ifndef IIR_H
#define IIR_H
#include <string.h>
#include "iir_cfs.h"
/*
* Flush-to-zero to avoid flooding the CPU with underflow exceptions
*/
#ifdef SSE_MATH
#define FTZ 0x8000
#define FTZ_ON { \
unsigned int mxcsr; \
__asm__ __volatile__ ("stmxcsr %0" : "=m" (*&mxcsr)); \
mxcsr |= FTZ; \
__asm__ __volatile__ ("ldmxcsr %0" : : "m" (*&mxcsr)); \
}
#define FTZ_OFF { \
unsigned int mxcsr; \
__asm__ __volatile__ ("stmxcsr %0" : "=m" (*&mxcsr)); \
mxcsr &= ~FTZ; \
__asm__ __volatile__ ("ldmxcsr %0" : : "m" (*&mxcsr)); \
}
#else
#define FTZ_ON
#define FTZ_OFF
#endif
/*
* Function prototypes
*/
void init_iir(void);
void config_iir(int srate, int bands, int original);
void clean_history(void);
void set_gain(int index, int chn, float val);
void set_preamp(int chn, float val);
int iir(void *d, int length, int nch, int extra_filtering);
#ifdef ARCH_X86
int round_trick(float floatvalue_to_round);
#endif
#ifdef ARCH_PPC
int round_ppc(float x);
#endif
#define EQ_CHANNELS 2
#define EQ_MAX_BANDS 31
extern float preamp[EQ_CHANNELS];
extern sIIRCoefficients *iir_cf;
extern int rate;
extern int band_count;
#ifdef BENCHMARK
extern double timex;
extern int count;
extern unsigned int blength;
#endif
#endif /* #define IIR_H */
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