diff options
Diffstat (limited to 'lib/equ')
| -rw-r--r-- | lib/equ/iir.c | 85 | ||||
| -rw-r--r-- | lib/equ/iir.h | 84 | ||||
| -rw-r--r-- | lib/equ/iir_cfs.c | 237 | ||||
| -rw-r--r-- | lib/equ/iir_cfs.h | 39 | ||||
| -rw-r--r-- | lib/equ/iir_fpu.c | 210 | ||||
| -rw-r--r-- | lib/equ/iir_fpu.h | 39 |
6 files changed, 0 insertions, 694 deletions
diff --git a/lib/equ/iir.c b/lib/equ/iir.c deleted file mode 100644 index 9d826b86c..000000000 --- a/lib/equ/iir.c +++ /dev/null @@ -1,85 +0,0 @@ -/* - * 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 diff --git a/lib/equ/iir.h b/lib/equ/iir.h deleted file mode 100644 index e7ea5ef1a..000000000 --- a/lib/equ/iir.h +++ /dev/null @@ -1,84 +0,0 @@ -/* - * 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.h,v 1.12 2005/10/17 01:57:59 liebremx Exp $ - */ -#ifndef IIR_H -#define IIR_H - -//#include <glib.h> -//#include "main.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 clean_history(); -void set_gain(int index, int chn, float val); -void set_preamp(int chn, float val); - - - int iir(void * d, int length, int nch); - -#ifdef ARCH_X86 -__inline__ int round_trick(float floatvalue_to_round); -#endif -#ifdef ARCH_PPC -__inline__ int round_ppc(float x); -#endif - -#define EQ_CHANNELS 2 -#define EQ_MAX_BANDS 10 - -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 */ - diff --git a/lib/equ/iir_cfs.c b/lib/equ/iir_cfs.c deleted file mode 100644 index f8e6f88a6..000000000 --- a/lib/equ/iir_cfs.c +++ /dev/null @@ -1,237 +0,0 @@ -/* - * 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. - * - * - * Coefficient stuff - * - * $Id: iir_cfs.c,v 1.1 2005/10/17 01:57:59 liebremx Exp $ - */ - -#include "iir_cfs.h" -#include <stdio.h> -#include <math.h> - -/*************************** - * IIR filter coefficients * - ***************************/ -static sIIRCoefficients iir_cf10_11k_11025[10] __attribute__((aligned)); -static sIIRCoefficients iir_cf10_22k_22050[10] __attribute__((aligned)); -static sIIRCoefficients iir_cforiginal10_44100[10] __attribute__((aligned)); -static sIIRCoefficients iir_cforiginal10_48000[10] __attribute__((aligned)); -static sIIRCoefficients iir_cf10_44100[10] __attribute__((aligned)); -static sIIRCoefficients iir_cf10_48000[10] __attribute__((aligned)); -static sIIRCoefficients iir_cf15_44100[15] __attribute__((aligned)); -static sIIRCoefficients iir_cf15_48000[15] __attribute__((aligned)); -static sIIRCoefficients iir_cf25_44100[25] __attribute__((aligned)); -static sIIRCoefficients iir_cf25_48000[25] __attribute__((aligned)); -static sIIRCoefficients iir_cf31_44100[31] __attribute__((aligned)); -static sIIRCoefficients iir_cf31_48000[31] __attribute__((aligned)); - -/****************************************************************** - * Definitions and data structures to calculate the coefficients - ******************************************************************/ -static const double band_f011k[] = -{ 31, 62, 125, 250, 500, 1000, 2000, 3000, 4000, 5500 -}; -static const double band_f022k[] = -{ 31, 62, 125, 250, 500, 1000, 2000, 4000, 8000, 11000 -}; -static const double band_f010[] = -{ 31, 62, 125, 250, 500, 1000, 2000, 4000, 8000, 16000 -}; -static const double band_original_f010[] = -{ 60, 170, 310, 600, 1000, 3000, 6000, 12000, 14000, 16000 -}; -static const double band_f015[] = -{ 25,40,63,100,160,250,400,630,1000,1600,2500,4000,6300,10000,16000 -}; -static const double band_f025[] = -{ 20,31.5,40,50,80,100,125,160,250,315,400,500,800, - 1000,1250,1600,2500,3150,4000,5000,8000,10000,12500,16000,20000 -}; -static const double band_f031[] = -{ 20,25,31.5,40,50,63,80,100,125,160,200,250,315,400,500,630,800, - 1000,1250,1600,2000,2500,3150,4000,5000,6300,8000,10000,12500,16000,20000 -}; - -#define GAIN_F0 1.0 -#define GAIN_F1 GAIN_F0 / M_SQRT2 - -#define SAMPLING_FREQ 44100.0 -#define TETA(f) (2*M_PI*(double)f/bands[n].sfreq) -#define TWOPOWER(value) (value * value) - -#define BETA2(tf0, tf) \ -(TWOPOWER(GAIN_F1)*TWOPOWER(cos(tf0)) \ - - 2.0 * TWOPOWER(GAIN_F1) * cos(tf) * cos(tf0) \ - + TWOPOWER(GAIN_F1) \ - - TWOPOWER(GAIN_F0) * TWOPOWER(sin(tf))) -#define BETA1(tf0, tf) \ - (2.0 * TWOPOWER(GAIN_F1) * TWOPOWER(cos(tf)) \ - + TWOPOWER(GAIN_F1) * TWOPOWER(cos(tf0)) \ - - 2.0 * TWOPOWER(GAIN_F1) * cos(tf) * cos(tf0) \ - - TWOPOWER(GAIN_F1) + TWOPOWER(GAIN_F0) * TWOPOWER(sin(tf))) -#define BETA0(tf0, tf) \ - (0.25 * TWOPOWER(GAIN_F1) * TWOPOWER(cos(tf0)) \ - - 0.5 * TWOPOWER(GAIN_F1) * cos(tf) * cos(tf0) \ - + 0.25 * TWOPOWER(GAIN_F1) \ - - 0.25 * TWOPOWER(GAIN_F0) * TWOPOWER(sin(tf))) - -#define GAMMA(beta, tf0) ((0.5 + beta) * cos(tf0)) -#define ALPHA(beta) ((0.5 - beta)/2.0) - -struct { - sIIRCoefficients *coeffs; - const double *cfs; - double octave; - int band_count; - double sfreq; -} bands[] = { - { iir_cf10_11k_11025, band_f011k, 1.0, 10, 11025.0 }, - { iir_cf10_22k_22050, band_f022k, 1.0, 10, 22050.0 }, - { iir_cforiginal10_44100, band_original_f010, 1.0, 10, 44100.0 }, - { iir_cforiginal10_48000, band_original_f010, 1.0, 10, 48000.0 }, - { iir_cf10_44100, band_f010, 1.0, 10, 44100.0 }, - { iir_cf10_48000, band_f010, 1.0, 10, 48000.0 }, - { iir_cf15_44100, band_f015, 2.0/3.0, 15, 44100.0 }, - { iir_cf15_48000, band_f015, 2.0/3.0, 15, 48000.0 }, - { iir_cf25_44100, band_f025, 1.0/3.0, 25, 44100.0 }, - { iir_cf25_48000, band_f025, 1.0/3.0, 25, 48000.0 }, - { iir_cf31_44100, band_f031, 1.0/3.0, 31, 44100.0 }, - { iir_cf31_48000, band_f031, 1.0/3.0, 31, 48000.0 }, - { 0, 0, 0, 0, 0 } -}; - -/************* - * Functions * - *************/ - -/* Get the coeffs for a given number of bands and sampling frequency */ -sIIRCoefficients* get_coeffs(int *bands, int sfreq) -{ - sIIRCoefficients *iir_cf = 0; - switch(sfreq) - { - case 11025: iir_cf = iir_cf10_11k_11025; - *bands = 10; - break; - case 22050: iir_cf = iir_cf10_22k_22050; - *bands = 10; - break; - case 48000: - switch(*bands) - { - case 31: iir_cf = iir_cf31_48000; break; - case 25: iir_cf = iir_cf25_48000; break; - case 15: iir_cf = iir_cf15_48000; break; - default: - /*iir_cf = use_xmms_original_freqs ? - iir_cforiginal10_48000 : - iir_cf10_48000;*/ - iir_cf = iir_cforiginal10_48000; - break; - } - break; - default: - switch(*bands) - { - case 31: iir_cf = iir_cf31_44100; break; - case 25: iir_cf = iir_cf25_44100; break; - case 15: iir_cf = iir_cf15_44100; break; - default: - /*iir_cf = use_xmms_original_freqs ? - iir_cforiginal10_44100 : - iir_cf10_44100;*/ - iir_cf = iir_cforiginal10_44100; - break; - } - break; - } - return iir_cf; -} - -/* Get the freqs at both sides of F0. These will be cut at -3dB */ -static void find_f1_and_f2(double f0, double octave_percent, double *f1, double *f2) -{ - double octave_factor = pow(2.0, octave_percent/2.0); - *f1 = f0/octave_factor; - *f2 = f0*octave_factor; -} - -/* Find the quadratic root - * Always return the smallest root */ -static int find_root(double a, double b, double c, double *x0) { - double k = c-((b*b)/(4.*a)); - double h = -(b/(2.*a)); - double x1 = 0.; - if (-(k/a) < 0.) - return -1; - *x0 = h - sqrt(-(k/a)); - x1 = h + sqrt(-(k/a)); - if (x1 < *x0) - *x0 = x1; - return 0; -} - -/* Calculate all the coefficients as specified in the bands[] array */ -void calc_coeffs() -{ - int i, n; - double f1, f2; - double x0; - - n = 0; - for (; bands[n].cfs; n++) { - double *freqs = (double *)bands[n].cfs; - for (i=0; i<bands[n].band_count; i++) - { - - /* Find -3dB frequencies for the center freq */ - find_f1_and_f2(freqs[i], bands[n].octave, &f1, &f2); - /* Find Beta */ - if ( find_root( - BETA2(TETA(freqs[i]), TETA(f1)), - BETA1(TETA(freqs[i]), TETA(f1)), - BETA0(TETA(freqs[i]), TETA(f1)), - &x0) == 0) - { - /* Got a solution, now calculate the rest of the factors */ - /* Take the smallest root always (find_root returns the smallest one) - * - * NOTE: The IIR equation is - * y[n] = 2 * (alpha*(x[n]-x[n-2]) + gamma*y[n-1] - beta*y[n-2]) - * Now the 2 factor has been distributed in the coefficients - */ - /* Now store the coefficients */ - bands[n].coeffs[i].beta = 2.0 * x0; - bands[n].coeffs[i].alpha = 2.0 * ALPHA(x0); - bands[n].coeffs[i].gamma = 2.0 * GAMMA(x0, TETA(freqs[i])); -#ifdef DEBUG - printf("Freq[%d]: %f. Beta: %.10e Alpha: %.10e Gamma %.10e\n", - i, freqs[i], bands[n].coeffs[i].beta, - bands[n].coeffs[i].alpha, bands[n].coeffs[i].gamma); -#endif - } else { - /* Shouldn't happen */ - bands[n].coeffs[i].beta = 0.; - bands[n].coeffs[i].alpha = 0.; - bands[n].coeffs[i].gamma = 0.; - printf(" **** Where are the roots?\n"); - } - }// for i - }//for n -} diff --git a/lib/equ/iir_cfs.h b/lib/equ/iir_cfs.h deleted file mode 100644 index c4cc4a0fd..000000000 --- a/lib/equ/iir_cfs.h +++ /dev/null @@ -1,39 +0,0 @@ -/* - * 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_cfs.h,v 1.1 2005/10/17 01:57:59 liebremx Exp $ - */ -#ifndef IIR_CFS_H -#define IIR_CFS_H - -//#include <glib.h> - -/* Coefficients entry */ -typedef struct -{ - float beta; - float alpha; - float gamma; - float dummy; // Word alignment -}sIIRCoefficients; - -sIIRCoefficients* get_coeffs(int *bands, int sfreq); //, bool use_xmms_original_freqs); -void calc_coeffs(); - -#endif diff --git a/lib/equ/iir_fpu.c b/lib/equ/iir_fpu.c deleted file mode 100644 index ae0051fdf..000000000 --- a/lib/equ/iir_fpu.c +++ /dev/null @@ -1,210 +0,0 @@ -/* - * 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_fpu.c,v 1.3 2005/11/13 20:02:58 lisanet Exp $ - */ - -#include <strings.h> -#include <stdlib.h> -//#include <glib.h> -#include "iir.h" -#include "iir_fpu.h" - -static sXYData data_history[EQ_MAX_BANDS][EQ_CHANNELS] __attribute__((aligned)); -static sXYData data_history2[EQ_MAX_BANDS][EQ_CHANNELS] __attribute__((aligned)); -float gain[EQ_MAX_BANDS][EQ_CHANNELS] __attribute__((aligned)); -/* random noise */ -sample_t dither[256]; -int di; - -void set_gain(int index, int chn, float val) -{ - gain[index][chn] = val; -} - -void clean_history() -{ - int n; - /* Zero the history arrays */ - bzero(data_history, sizeof(sXYData) * EQ_MAX_BANDS * EQ_CHANNELS); - bzero(data_history2, sizeof(sXYData) * EQ_MAX_BANDS * EQ_CHANNELS); - /* this is only needed if we use fpu code and there's no other place for - the moment to init the dither array*/ - for (n = 0; n < 256; n++) { - dither[n] = (rand() % 4) - 2; - } - di = 0; -} - -__inline__ int iir(void * d, int length, int nch) -{ -/* FTZ_ON; */ - short *data = (short *) d; - /* Indexes for the history arrays - * These have to be kept between calls to this function - * hence they are static */ - static int i = 2, j = 1, k = 0; - - int index, band, channel; - int tempgint, halflength; - sample_t out[EQ_CHANNELS], pcm[EQ_CHANNELS]; - -#if 0 - /* Load the correct filter table according to the sampling rate if needed */ - if (srate != rate) - { - band_count = eqcfg.band_num; - rate = srate; - iir_cf = get_coeffs(&band_count, rate, eqcfg.use_xmms_original_freqs); - clean_history(); - } -#endif - -#ifdef BENCHMARK - start_counter(); -#endif /* BENCHMARK */ - - /** - * IIR filter equation is - * y[n] = 2 * (alpha*(x[n]-x[n-2]) + gamma*y[n-1] - beta*y[n-2]) - * - * NOTE: The 2 factor was introduced in the coefficients to save - * a multiplication - * - * This algorithm cascades two filters to get nice filtering - * at the expense of extra CPU cycles - */ - /* 16bit, 2 bytes per sample, so divide by two the length of - * the buffer (length is in bytes) - */ - halflength = (length >> 1); - for (index = 0; index < halflength; index+=nch) - { - /* For each channel */ - for (channel = 0; channel < nch; channel++) - { - pcm[channel] = data[index+channel] * 4; - /* Preamp gain */ - pcm[channel] *= (preamp[channel] / 2); - - /* add random noise */ - pcm[channel] += dither[di]; - - out[channel] = 0.0; - /* For each band */ - for (band = 0; band < band_count; band++) - { - /* Store Xi(n) */ - data_history[band][channel].x[i] = pcm[channel]; - /* Calculate and store Yi(n) */ - data_history[band][channel].y[i] = - ( - /* = alpha * [x(n)-x(n-2)] */ - iir_cf[band].alpha * ( data_history[band][channel].x[i] - - data_history[band][channel].x[k]) - /* + gamma * y(n-1) */ - + iir_cf[band].gamma * data_history[band][channel].y[j] - /* - beta * y(n-2) */ - - iir_cf[band].beta * data_history[band][channel].y[k] - ); - /* - * The multiplication by 2.0 was 'moved' into the coefficients to save - * CPU cycles here */ - /* Apply the gain */ - out[channel] += data_history[band][channel].y[i]*gain[band][channel]; /* * 2.0; */ - } /* For each band */ - - //if (cfg.eq_extra_filtering) - { - /* Filter the sample again */ - for (band = 0; band < band_count; band++) - { - /* Store Xi(n) */ - data_history2[band][channel].x[i] = out[channel]; - /* Calculate and store Yi(n) */ - data_history2[band][channel].y[i] = - ( - /* y(n) = alpha * [x(n)-x(n-2)] */ - iir_cf[band].alpha * (data_history2[band][channel].x[i] - - data_history2[band][channel].x[k]) - /* + gamma * y(n-1) */ - + iir_cf[band].gamma * data_history2[band][channel].y[j] - /* - beta * y(n-2) */ - - iir_cf[band].beta * data_history2[band][channel].y[k] - ); - /* Apply the gain */ - out[channel] += data_history2[band][channel].y[i]*gain[band][channel]; - } /* For each band */ - } - - /* Volume stuff - Scale down original PCM sample and add it to the filters - output. This substitutes the multiplication by 0.25 - Go back to use the floating point multiplication before the - conversion to give more dynamic range - */ - out[channel] += pcm[channel]*0.25; - - /* remove random noise */ - out[channel] -= dither[di]*0.25; - - /* Round and convert to integer */ -#ifdef ARCH_PPC - tempgint = round_ppc(out[channel]); -#else -#ifdef ARCH_X86 - tempgint = round_trick(out[channel]); -#else - tempgint = (int)out[channel]; -#endif -#endif - - /* Limit the output */ - if (tempgint < -32768) - data[index+channel] = -32768; - else if (tempgint > 32767) - data[index+channel] = 32767; - else - data[index+channel] = tempgint; - } /* For each channel */ - - /* Wrap around the indexes */ - i = (i+1)%3; - j = (j+1)%3; - k = (k+1)%3; - /* random noise index */ - di = (di + 1) % 256; - - }/* For each pair of samples */ - -#ifdef BENCHMARK - timex += get_counter(); - blength += length; - if (count++ == 1024) - { - printf("FLOATING POINT: %f %d\n",timex/1024.0, blength/1024); - blength = 0; - timex = 0.; - count = 0; - } -#endif /* BENCHMARK */ - -/* FTZ_OFF; */ - return length; -} diff --git a/lib/equ/iir_fpu.h b/lib/equ/iir_fpu.h deleted file mode 100644 index 990eebf97..000000000 --- a/lib/equ/iir_fpu.h +++ /dev/null @@ -1,39 +0,0 @@ -/* - * 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_fpu.h,v 1.2 2005/11/01 15:59:20 lisanet Exp $$ - */ -#ifndef IIR_FPU_H -#define IIR_FPU_H - -#define sample_t double - -/* - * Normal FPU implementation data structures - */ -/* Coefficient history for the IIR filter */ -typedef struct -{ - sample_t x[3]; /* x[n], x[n-1], x[n-2] */ - sample_t y[3]; /* y[n], y[n-1], y[n-2] */ - sample_t dummy1; // Word alignment - sample_t dummy2; -}sXYData; - -#endif |