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/* ScummVM - Scumm Interpreter
* Copyright (C) 2004 The ScummVM project
* Copyright (C) 2000 Jezar at Dreampoint
*
* This code is public domain
*
* Parts of this code are:
*
* 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.
*
* $Header$
*
*/
// Macro for killing denormalled numbers
//
// Written by Jezar at Dreampoint, June 2000
// http://www.dreampoint.co.uk
// Based on IS_DENORMAL macro by Jon Watte
// This code is public domain
#ifndef FREEVERB_H
#define FREEVERB_H
#define undenormalise(sample) if (((*(unsigned int*)&sample) & 0x7f800000) == 0) sample = 0.0f
// Comb filter class declaration
class comb {
public:
comb();
void setbuffer(float *buf, int size);
inline float process(float inp);
void mute();
void setdamp(float val);
float getdamp();
void setfeedback(float val);
float getfeedback();
private:
float feedback;
float filterstore;
float damp1;
float damp2;
float *buffer;
int bufsize;
int bufidx;
};
// Big to inline - but crucial for speed
inline float comb::process(float input) {
float output;
output = buffer[bufidx];
undenormalise(output);
filterstore = (output * damp2) + (filterstore * damp1);
undenormalise(filterstore);
buffer[bufidx] = input + (filterstore * feedback);
if (++bufidx >= bufsize)
bufidx = 0;
return output;
}
// Allpass filter declaration
class allpass {
public:
allpass();
void setbuffer(float *buf, int size);
inline float process(float inp);
void mute();
void setfeedback(float val);
float getfeedback();
private:
float feedback;
float *buffer;
int bufsize;
int bufidx;
};
// Big to inline - but crucial for speed
inline float allpass::process(float input) {
float output;
float bufout;
bufout = buffer[bufidx];
undenormalise(bufout);
output = -input + bufout;
buffer[bufidx] = input + (bufout * feedback);
if (++bufidx >= bufsize)
bufidx = 0;
return output;
}
// Reverb model tuning values
const int numcombs = 8;
const int numallpasses = 4;
const float muted = 0;
const float fixedgain = 0.015f;
const float scalewet = 3;
const float scaledry = 2;
const float scaledamp = 0.4f;
const float scaleroom = 0.28f;
const float offsetroom = 0.7f;
const float initialroom = 0.5f;
const float initialdamp = 0.5f;
const float initialwet = 1 / scalewet;
const float initialdry = 0;
const float initialwidth = 1;
const float initialmode = 0;
const float freezemode = 0.5f;
const int stereospread = 23;
// These values assume 44.1KHz sample rate
// they will probably be OK for 48KHz sample rate
// but would need scaling for 96KHz (or other) sample rates.
// The values were obtained by listening tests.
const int combtuningL1 = 1116;
const int combtuningR1 = 1116 + stereospread;
const int combtuningL2 = 1188;
const int combtuningR2 = 1188 + stereospread;
const int combtuningL3 = 1277;
const int combtuningR3 = 1277 + stereospread;
const int combtuningL4 = 1356;
const int combtuningR4 = 1356 + stereospread;
const int combtuningL5 = 1422;
const int combtuningR5 = 1422 + stereospread;
const int combtuningL6 = 1491;
const int combtuningR6 = 1491 + stereospread;
const int combtuningL7 = 1557;
const int combtuningR7 = 1557 + stereospread;
const int combtuningL8 = 1617;
const int combtuningR8 = 1617 + stereospread;
const int allpasstuningL1 = 556;
const int allpasstuningR1 = 556 + stereospread;
const int allpasstuningL2 = 441;
const int allpasstuningR2 = 441 + stereospread;
const int allpasstuningL3 = 341;
const int allpasstuningR3 = 341 + stereospread;
const int allpasstuningL4 = 225;
const int allpasstuningR4 = 225 + stereospread;
// Reverb model declaration
class revmodel {
public:
revmodel();
void mute();
void processmix(float *inputL, float *inputR, float *outputL, float *outputR, long numsamples, int skip);
void processreplace(float *inputL, float *inputR, float *outputL, float *outputR, long numsamples, int skip);
void setroomsize(float value);
float getroomsize();
void setdamp(float value);
float getdamp();
void setwet(float value);
float getwet();
void setdry(float value);
float getdry();
void setwidth(float value);
float getwidth();
void setmode(float value);
float getmode();
private:
void update();
float gain;
float roomsize, roomsize1;
float damp, damp1;
float wet, wet1, wet2;
float dry;
float width;
float mode;
// The following are all declared inline
// to remove the need for dynamic allocation
// with its subsequent error-checking messiness
// Comb filters
comb combL[numcombs];
comb combR[numcombs];
// Allpass filters
allpass allpassL[numallpasses];
allpass allpassR[numallpasses];
// Buffers for the combs
float bufcombL1[combtuningL1];
float bufcombR1[combtuningR1];
float bufcombL2[combtuningL2];
float bufcombR2[combtuningR2];
float bufcombL3[combtuningL3];
float bufcombR3[combtuningR3];
float bufcombL4[combtuningL4];
float bufcombR4[combtuningR4];
float bufcombL5[combtuningL5];
float bufcombR5[combtuningR5];
float bufcombL6[combtuningL6];
float bufcombR6[combtuningR6];
float bufcombL7[combtuningL7];
float bufcombR7[combtuningR7];
float bufcombL8[combtuningL8];
float bufcombR8[combtuningR8];
// Buffers for the allpasses
float bufallpassL1[allpasstuningL1];
float bufallpassR1[allpasstuningR1];
float bufallpassL2[allpasstuningL2];
float bufallpassR2[allpasstuningR2];
float bufallpassL3[allpasstuningL3];
float bufallpassR3[allpasstuningR3];
float bufallpassL4[allpasstuningL4];
float bufallpassR4[allpasstuningR4];
};
#endif
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