[PD-cvs] externals/freeverb~ LICENSE, NONE, 1.1 README, NONE, 1.1 freeverb~.cpp, NONE, 1.1 freeverb~.dsp, NONE, 1.1

Hans-Christoph Steiner eighthave at users.sourceforge.net
Thu Nov 10 15:35:15 CET 2005


Update of /cvsroot/pure-data/externals/freeverb~
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv17107

Added Files:
	LICENSE README freeverb~.cpp freeverb~.dsp 
Log Message:
imported Olaf Matthes' Max version 1.2

--- NEW FILE: README ---
freeverb~ version 1.2
reverb external for Pure Data and Max/MSP
written by Olaf Matthes <olaf.matthes at gmx.de>

based on Freeverb, the free, studio-quality reverb SOURCE CODE in the public 
domain, Written by Jezar at Dreampoint - http://www.dreampoint.co.uk

This software is published under GPL terms, see file LICENSE.

This is software with ABSOLUTELY NO WARRANTY.
Use it at your OWN RISK. It's possible to damage e.g. hardware or your hearing
due to a bug or for other reasons. 

Recent changes:
- added check for NANs
- added a hand unrolled version of the perform routine for DSP vector sizes that
  are a multiple of 8. This should speed up things a bit


Below some notes taken from Freeverb readme:
-------------------------------------------------------------------------------------

Note that this version of Freeverb doesn't contain predelay, or any EQ. I thought 
that might make it difficult to understand the "reverb" part of the code. Once you 
figure out how Freeverb works, you should find it trivial to add such features with 
little CPU overhead.

Technical Explanation 
---------------------

Freeverb is a simple implementation of the standard Schroeder/Moorer reverb model. 
I guess the only reason why it sounds better than other reverbs, is simply because 
I spent a long while doing listening tests in order to create the values found in "tuning.h". It uses 8 comb filters on both the left and right channels), and you 
might possibly be able to get away with less if CPU power is a serious constraint 
for you. It then feeds the result of the reverb through 4 allpass filters on both 
the left and right channels. These "smooth" the sound. Adding more than four allpasses 
doesn't seem to add anything significant to the sound, and if you use less, the sound 
gets a bit "grainy". The filters on the right channel are slightly detuned compared 
to the left channel in order to create a stereo effect.


--- NEW FILE: freeverb~.cpp ---
/* -------------------------- freeverb~ --------------------------------------- */
/*                                                                              */
/* Tilde object that implements the Schroeder/Moorer reverb model.              */
/* Written by Olaf Matthes <olaf.matthes at gmx.de>.                               */
/* Get source at http://www.akustische-kunst.org/                               */
/*                                                                              */
/* 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.  */
/*                                                                              */
/* Based on PureData by Miller Puckette and others.                             */
/* Also compiles for Max/MSP.                                                   */
/*                                                                              */
/* ---------------------------------------------------------------------------- */

#ifdef NT
#pragma warning( disable : 4091 )
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif

#ifdef PD
#include "m_pd.h"
#else	// Max/MSP
#include "ext.h"
#include "z_dsp.h"
#define t_floatarg double
#endif

#include <math.h>
#include <string.h>

#define LOGTEN 2.302585092994

#define	numcombs		8
#define	numallpasses	4
#define	muted			0
#define	fixedgain		0.015
#define scalewet		3.0
#define scaledry		2.0
#define scaledamp		0.4
#define scaleroom		0.28
#define offsetroom		0.7
#define initialroom		0.5
#define initialdamp		0.5
#define initialwet		1.0/scalewet
#define initialdry		0.0
#define initialwidth	1.0
#define initialmode		0
#define initialbypass   0
#define freezemode		0.5
#define	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.                */
static const int combtuningL[numcombs]
                     = { 1116, 1188, 1277, 1356, 1422, 1491, 1557, 1617 };
static const int combtuningR[numcombs]
                     = { 1116+stereospread, 1188+stereospread, 1277+stereospread, 1356+stereospread,
					     1422+stereospread, 1491+stereospread, 1557+stereospread, 1617+stereospread };

static const int allpasstuningL[numallpasses]
                     = { 556, 441, 341, 225 };
static const int allpasstuningR[numallpasses]
                     = { 556+stereospread, 441+stereospread, 341+stereospread, 225+stereospread };

static char *version = "freeverb~ v1.2";

#ifdef PD
static t_class *freeverb_class;

typedef struct _freeverb
{
    t_object x_obj;
#else	// Max/MSP
void *freeverb_class;

typedef struct _freeverb
{
	t_pxobject x_obj;
#endif
		/* freeverb stuff */
	t_float	x_gain;
	t_float	x_roomsize,x_roomsize1;
	t_float	x_damp,x_damp1;
	t_float	x_wet,x_wet1,x_wet2;
	t_float	x_dry;
	t_float	x_width;
	t_float	x_mode;
	t_float x_bypass;
	int     x_skip;

	t_float	x_allpassfeedback;			/* feedback of allpass filters */
	t_float	x_combfeedback;				/* feedback of comb filters */
	t_float x_combdamp1;
	t_float x_combdamp2;
	t_float x_filterstoreL[numcombs];	/* stores last sample value */
	t_float x_filterstoreR[numcombs];

		/* buffers for the combs */
	t_float	*x_bufcombL[numcombs];
	t_float	*x_bufcombR[numcombs];
	int x_combidxL[numcombs];
	int x_combidxR[numcombs];

		/* buffers for the allpasses */
	t_float	*x_bufallpassL[numallpasses];
	t_float	*x_bufallpassR[numallpasses];
	int x_allpassidxL[numallpasses];
	int x_allpassidxR[numallpasses];

		/* we'll make local copies adjusted to fit our sample rate */
	int x_combtuningL[numcombs];
	int x_combtuningR[numcombs];

	int x_allpasstuningL[numallpasses];
	int x_allpasstuningR[numallpasses];

#ifdef PD
	t_float x_float;
#endif
} t_freeverb;

#ifndef IRIX
#define IS_DENORM_FLOAT(v)              ((((*(unsigned long*)&(v))&0x7f800000)==0)&&((v)!=0.f))
#define IS_NAN_FLOAT(v)                 (((*(unsigned long*)&(v))&0x7f800000)==0x7f800000)
#define IS_DENORM_NAN_FLOAT(v)          (IS_DENORM_FLOAT(v)||IS_NAN_FLOAT(v))
#define FIX_DENORM_NAN_FLOAT(v)         ((v)=IS_DENORM_NAN_FLOAT(v)?0.f:(v))
#else
#define FIX_DENORM_NAN_FLOAT(v);
#endif

	/* we need prototypes for Mac for everything */
static void comb_setdamp(t_freeverb *x, t_floatarg val);
static void comb_setfeedback(t_freeverb *x, t_floatarg val);
static inline t_float comb_processL(t_freeverb *x, int filteridx, t_float input);
static inline t_float comb_processR(t_freeverb *x, int filteridx, t_float input);
static void allpass_setfeedback(t_freeverb *x, t_floatarg val);
static inline t_float allpass_processL(t_freeverb *x, int filteridx, t_float input);
static inline t_float allpass_processR(t_freeverb *x, int filteridx, t_float input);
t_int *freeverb_perform(t_int *w);
t_int *freeverb_perf8(t_int *w);
static void dsp_add_freeverb(t_freeverb *x, t_sample *in1, t_sample *in2, t_sample *out1, t_sample *out2, int n);
void freeverb_dsp(t_freeverb *x, t_signal **sp);
static void freeverb_update(t_freeverb *x);
static void freeverb_setroomsize(t_freeverb *x, t_floatarg value);
static float freeverb_getroomsize(t_freeverb *x);
static void freeverb_setdamp(t_freeverb *x, t_floatarg value);
static float freeverb_getdamp(t_freeverb *x);
static void freeverb_setwet(t_freeverb *x, t_floatarg value);
static float freeverb_getwet(t_freeverb *x);
static void freeverb_setdry(t_freeverb *x, t_floatarg value);
static float freeverb_getdry(t_freeverb *x);
static void freeverb_setwidth(t_freeverb *x, t_floatarg value);
static float freeverb_getwidth(t_freeverb *x);
static void freeverb_setmode(t_freeverb *x, t_floatarg value);
static float freeverb_getmode(t_freeverb *x);
static void freeverb_setbypass(t_freeverb *x, t_floatarg value);
static void freeverb_mute(t_freeverb *x);
static float freeverb_getdb(float f);
static void freeverb_print(t_freeverb *x);
#ifndef PD
void freeverb_assist(t_freeverb *x, void *b, long m, long a, char *s);
#endif
static void freeverb_free(t_freeverb *x);
void *freeverb_new(t_floatarg val);

/* -------------------- comb filter stuff ----------------------- */
static void comb_setdamp(t_freeverb *x, t_floatarg val) 
{
	x->x_combdamp1 = val; 
	x->x_combdamp2 = 1-val;
}

static void comb_setfeedback(t_freeverb *x, t_floatarg val) 
{
	x->x_combfeedback = val;
}

// Big to inline - but crucial for speed
static inline t_float comb_processL(t_freeverb *x, int filteridx, t_float input)
{
	t_float output;
	int bufidx = x->x_combidxL[filteridx];

	output = x->x_bufcombL[filteridx][bufidx];
	FIX_DENORM_NAN_FLOAT(output);

	x->x_filterstoreL[filteridx] = (output*x->x_combdamp2) + (x->x_filterstoreL[filteridx]*x->x_combdamp1);
	FIX_DENORM_NAN_FLOAT(x->x_filterstoreL[filteridx]);

	x->x_bufcombL[filteridx][bufidx] = input + (x->x_filterstoreL[filteridx]*x->x_combfeedback);

	if(++x->x_combidxL[filteridx] >= x->x_combtuningL[filteridx]) x->x_combidxL[filteridx] = 0;

	return output;
}

static inline t_float comb_processR(t_freeverb *x, int filteridx, t_float input)
{
	t_float output;
	int bufidx = x->x_combidxR[filteridx];

	output = x->x_bufcombR[filteridx][bufidx];
	FIX_DENORM_NAN_FLOAT(output);

	x->x_filterstoreR[filteridx] = (output*x->x_combdamp2) + (x->x_filterstoreR[filteridx]*x->x_combdamp1);
	FIX_DENORM_NAN_FLOAT(x->x_filterstoreR[filteridx]);

	x->x_bufcombR[filteridx][bufidx] = input + (x->x_filterstoreR[filteridx]*x->x_combfeedback);

	if(++x->x_combidxR[filteridx] >= x->x_combtuningR[filteridx]) x->x_combidxR[filteridx] = 0;

	return output;
}

/* -------------------- allpass filter stuff ----------------------- */
static void allpass_setfeedback(t_freeverb *x, t_floatarg val) 
{
	x->x_allpassfeedback = val;
}

// Big to inline - but crucial for speed
static inline t_float allpass_processL(t_freeverb *x, int filteridx, t_float input)
{
	t_float output;
	t_float bufout;
	int bufidx = x->x_allpassidxL[filteridx];
	
	bufout = (t_float)x->x_bufallpassL[filteridx][bufidx];
	FIX_DENORM_NAN_FLOAT(bufout);
	
	output = -input + bufout;
	x->x_bufallpassL[filteridx][bufidx] = input + (bufout*x->x_allpassfeedback);

	if(++x->x_allpassidxL[filteridx] >= x->x_allpasstuningL[filteridx])
		x->x_allpassidxL[filteridx] = 0;

	return output;
}

static inline t_float allpass_processR(t_freeverb *x, int filteridx, t_float input)
{
	t_float output;
	t_float bufout;
	int bufidx = x->x_allpassidxR[filteridx];
	
	bufout = (t_float)x->x_bufallpassR[filteridx][bufidx];
	FIX_DENORM_NAN_FLOAT(bufout);
	
	output = -input + bufout;
	x->x_bufallpassR[filteridx][bufidx] = input + (bufout*x->x_allpassfeedback);

	if(++x->x_allpassidxR[filteridx] >= x->x_allpasstuningR[filteridx])
		x->x_allpassidxR[filteridx] = 0;

	return output;
}

/* -------------------- general DSP stuff ----------------------- */
t_int *freeverb_perform(t_int *w)
{
	// assign from parameters
    t_freeverb *x = (t_freeverb *)(w[1]);
    t_float *in1 = (t_float *)(w[2]);
    t_float *in2 = (t_float *)(w[3]);
    t_float *out1 = (t_float *)(w[4]);
    t_float *out2 = (t_float *)(w[5]);
    int n = (int)(w[6]);
	int i;
	t_float outL, outR, inL, inR, input;
    
#ifndef PD
    if (x->x_obj.z_disabled)
    	goto out;    	 
#endif

	if(x->x_bypass)
	{
		// Bypass, so just copy input to output
		while(n--)
		{
			inL = *in1++;	// We have to copy first before we can write to output
			inR = *in2++;	// since this might be at the same memory position
			*out1++ = inL;
			*out2++ = inR;
		}
	}
	else
	{
    	// DSP loop
		while(n--)
		{
			outL = outR = 0.;
			inL = *in1++;
			inR = *in2++;
			input = (inL + inR) * x->x_gain;

			// Accumulate comb filters in parallel
			for(i=0; i < numcombs; i++)
			{
				outL += comb_processL(x, i, input);
				outR += comb_processR(x, i, input);
			}

			// Feed through allpasses in series
			for(i=0; i < numallpasses; i++)
			{
				outL = allpass_processL(x, i, outL);
				outR = allpass_processR(x, i, outR);
			}

			// Calculate output REPLACING anything already there
			*out1++ = outL*x->x_wet1 + outR*x->x_wet2 + inL*x->x_dry;
			*out2++ = outR*x->x_wet1 + outL*x->x_wet2 + inR*x->x_dry;
		}
	}
#ifndef PD
out:
#endif
	return(w + 7);
}

// This is a hand unrolled version of the perform routine for
// DSP vector sizes that are multiples of 8
t_int *freeverb_perf8(t_int *w)
{
	// assign from parameters
    t_freeverb *x = (t_freeverb *)(w[1]);
    t_float *in1 = (t_float *)(w[2]);
    t_float *in2 = (t_float *)(w[3]);
    t_float *out1 = (t_float *)(w[4]);
    t_float *out2 = (t_float *)(w[5]);
    int n = (int)(w[6]);
	int i;
	t_float outL[8], outR[8], inL[8], inR[8], input[8];
    
#ifndef PD
    if (x->x_obj.z_disabled)
    	goto out;    	 
#endif

	if(x->x_bypass)
	{
		// Bypass, so just copy input to output
		for(; n; n -= 8, out1 += 8, out2 += 8, in1 += 8, in2 += 8)
		{
			inL[0] = in1[0];	// We have to copy first before we can write to output
			inR[0] = in2[0];	// since this might be at the same memory position
			out1[0] = inL[0];
			out2[0] = inR[0];
			inL[1] = in1[1];
			inR[1] = in2[1];
			out1[1] = inL[1];
			out2[1] = inR[1];
			inL[2] = in1[2];
			inR[2] = in2[2];
			out1[2] = inL[2];
			out2[2] = inR[2];
			inL[3] = in1[3];
			inR[3] = in2[3];
			out1[3] = inL[3];
			out2[3] = inR[3];
			inL[4] = in1[4];
			inR[4] = in2[4];
			out1[4] = inL[4];
			out2[4] = inR[4];
			inL[5] = in1[5];
			inR[5] = in2[5];
			out1[5] = inL[5];
			out2[5] = inR[5];
			inL[6] = in1[6];
			inR[6] = in2[6];
			out1[6] = inL[6];
			out2[6] = inR[6];
			inL[7] = in1[7];
			inR[7] = in2[7];
			out1[7] = inL[7];
			out2[7] = inR[7];
		}
	}
	else
	{
    	// DSP loop
		for(; n; n -= 8, out1 += 8, out2 += 8, in1 += 8, in2 += 8)
		{
			outL[0] = outR [0]= 0.;
			inL[0] = in1[0];
			inR[0] = in2[0];
			input[0] = (inL[0] + inR[0]) * x->x_gain;

			outL[1] = outR [1]= 0.;
			inL[1] = in1[1];
			inR[1] = in2[1];
			input[1] = (inL[1] + inR[1]) * x->x_gain;

			outL[2] = outR [2]= 0.;
			inL[2] = in1[2];
			inR[2] = in2[2];
			input[2] = (inL[2] + inR[2]) * x->x_gain;

			outL[3] = outR [3]= 0.;
			inL[3] = in1[3];
			inR[3] = in2[3];
			input[3] = (inL[3] + inR[3]) * x->x_gain;

			outL[4] = outR [4]= 0.;
			inL[4] = in1[4];
			inR[4] = in2[4];
			input[4] = (inL[4] + inR[4]) * x->x_gain;

			outL[5] = outR [5]= 0.;
			inL[5] = in1[5];
			inR[5] = in2[5];
			input[5] = (inL[5] + inR[5]) * x->x_gain;

			outL[6] = outR [6]= 0.;
			inL[6] = in1[6];
			inR[6] = in2[6];
			input[6] = (inL[6] + inR[6]) * x->x_gain;

			outL[7] = outR [7]= 0.;
			inL[7] = in1[7];
			inR[7] = in2[7];
			input[7] = (inL[7] + inR[7]) * x->x_gain;

			// Accumulate comb filters in parallel
			for(i=0; i < numcombs; i++)
			{
				outL[0] += comb_processL(x, i, input[0]);
				outR[0] += comb_processR(x, i, input[0]);
				outL[1] += comb_processL(x, i, input[1]);
				outR[1] += comb_processR(x, i, input[1]);
				outL[2] += comb_processL(x, i, input[2]);
				outR[2] += comb_processR(x, i, input[2]);
				outL[3] += comb_processL(x, i, input[3]);
				outR[3] += comb_processR(x, i, input[3]);
				outL[4] += comb_processL(x, i, input[4]);
				outR[4] += comb_processR(x, i, input[4]);
				outL[5] += comb_processL(x, i, input[5]);
				outR[5] += comb_processR(x, i, input[5]);
				outL[6] += comb_processL(x, i, input[6]);
				outR[6] += comb_processR(x, i, input[6]);
				outL[7] += comb_processL(x, i, input[7]);
				outR[7] += comb_processR(x, i, input[7]);
			}

			// Feed through allpasses in series
			for(i=0; i < numallpasses; i++)
			{
				outL[0] = allpass_processL(x, i, outL[0]);
				outR[0] = allpass_processR(x, i, outR[0]);
				outL[1] = allpass_processL(x, i, outL[1]);
				outR[1] = allpass_processR(x, i, outR[1]);
				outL[2] = allpass_processL(x, i, outL[2]);
				outR[2] = allpass_processR(x, i, outR[2]);
				outL[3] = allpass_processL(x, i, outL[3]);
				outR[3] = allpass_processR(x, i, outR[3]);
				outL[4] = allpass_processL(x, i, outL[4]);
				outR[4] = allpass_processR(x, i, outR[4]);
				outL[5] = allpass_processL(x, i, outL[5]);
				outR[5] = allpass_processR(x, i, outR[5]);
				outL[6] = allpass_processL(x, i, outL[6]);
				outR[6] = allpass_processR(x, i, outR[6]);
				outL[7] = allpass_processL(x, i, outL[7]);
				outR[7] = allpass_processR(x, i, outR[7]);
			}

			// Calculate output REPLACING anything already there
			out1[0] = outL[0]*x->x_wet1 + outR[0]*x->x_wet2 + inL[0]*x->x_dry;
			out2[0] = outR[0]*x->x_wet1 + outL[0]*x->x_wet2 + inR[0]*x->x_dry;

			out1[1] = outL[1]*x->x_wet1 + outR[1]*x->x_wet2 + inL[1]*x->x_dry;
			out2[1] = outR[1]*x->x_wet1 + outL[1]*x->x_wet2 + inR[1]*x->x_dry;
			out1[2] = outL[2]*x->x_wet1 + outR[2]*x->x_wet2 + inL[2]*x->x_dry;
			out2[2] = outR[2]*x->x_wet1 + outL[2]*x->x_wet2 + inR[2]*x->x_dry;
			out1[3] = outL[3]*x->x_wet1 + outR[3]*x->x_wet2 + inL[3]*x->x_dry;
			out2[3] = outR[3]*x->x_wet1 + outL[3]*x->x_wet2 + inR[3]*x->x_dry;
			out1[4] = outL[4]*x->x_wet1 + outR[4]*x->x_wet2 + inL[4]*x->x_dry;
			out2[4] = outR[4]*x->x_wet1 + outL[4]*x->x_wet2 + inR[4]*x->x_dry;
			out1[5] = outL[5]*x->x_wet1 + outR[5]*x->x_wet2 + inL[5]*x->x_dry;
			out2[5] = outR[5]*x->x_wet1 + outL[5]*x->x_wet2 + inR[5]*x->x_dry;
			out1[6] = outL[6]*x->x_wet1 + outR[6]*x->x_wet2 + inL[6]*x->x_dry;
			out2[6] = outR[6]*x->x_wet1 + outL[6]*x->x_wet2 + inR[6]*x->x_dry;
			out1[7] = outL[7]*x->x_wet1 + outR[7]*x->x_wet2 + inL[7]*x->x_dry;
			out2[7] = outR[7]*x->x_wet1 + outL[7]*x->x_wet2 + inR[7]*x->x_dry;
			}
	}
#ifndef PD
out:
#endif
	return(w + 7);
}

static void dsp_add_freeverb(t_freeverb *x, t_sample *in1, t_sample *in2, 
							 t_sample *out1, t_sample *out2, int n)
{
	if(n & 7)	// check whether block size is multiple of 8
		dsp_add(freeverb_perform, 6, x, in1, in2, out1, out2, n);
	else
		dsp_add(freeverb_perf8, 6, x, in1, in2, out1, out2, n);
}

void freeverb_dsp(t_freeverb *x, t_signal **sp)
{
    dsp_add_freeverb(x, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec, sp[0]->s_n);
}

// ----------- general parameter & calculation stuff -----------

	// recalculate internal values after parameter change
static void freeverb_update(t_freeverb *x)
{

	int i;

	x->x_wet1 = x->x_wet*(x->x_width/2 + 0.5);
	x->x_wet2 = x->x_wet*((1-x->x_width)/2);

	if (x->x_mode >= freezemode)
	{
		x->x_roomsize1 = 1.;
		x->x_damp1 = 0.;
		x->x_gain = muted;
	}
	else
	{
		x->x_roomsize1 = x->x_roomsize;
		x->x_damp1 = x->x_damp;
		x->x_gain = (float)fixedgain;
	}

	comb_setfeedback(x, x->x_roomsize1);
	comb_setdamp(x, x->x_damp1);
}

	// the following functions set / get the parameters
static void freeverb_setroomsize(t_freeverb *x, t_floatarg value)
{
	x->x_roomsize = (value*scaleroom) + offsetroom;
	freeverb_update(x);
}

static float freeverb_getroomsize(t_freeverb *x)
{
	return (x->x_roomsize-offsetroom)/scaleroom;
}

static void freeverb_setdamp(t_freeverb *x, t_floatarg value)
{
	x->x_damp = value*scaledamp;
	freeverb_update(x);
}

static float freeverb_getdamp(t_freeverb *x)
{
	return x->x_damp/scaledamp;
}

static void freeverb_setwet(t_freeverb *x, t_floatarg value)
{
	x->x_wet = value*scalewet;
	freeverb_update(x);
}

static float freeverb_getwet(t_freeverb *x)
{
	return (x->x_wet/scalewet);
}

static void freeverb_setdry(t_freeverb *x, t_floatarg value)
{
	x->x_dry = value*scaledry;
}

static float freeverb_getdry(t_freeverb *x)
{
	return (x->x_dry/scaledry);
}

static void freeverb_setwidth(t_freeverb *x, t_floatarg value)
{
	x->x_width = value;
	freeverb_update(x);
}

static float freeverb_getwidth(t_freeverb *x)
{
	return x->x_width;
}

static void freeverb_setmode(t_freeverb *x, t_floatarg value)
{
	x->x_mode = value;
	freeverb_update(x);
}

static float freeverb_getmode(t_freeverb *x)
{
	if (x->x_mode >= freezemode)
		return 1;
	else
		return 0;
}

static void freeverb_setbypass(t_freeverb *x, t_floatarg value)
{
	x->x_bypass = value;
	if(x->x_bypass)freeverb_mute(x);
}

	// fill delay lines with silence
static void freeverb_mute(t_freeverb *x)
{
	int i;

	if (freeverb_getmode(x) >= freezemode)
		return;

	for (i=0;i<numcombs;i++)
	{
		memset(x->x_bufcombL[i], 0x0, x->x_combtuningL[i]*sizeof(t_float));
		memset(x->x_bufcombR[i], 0x0, x->x_combtuningR[i]*sizeof(t_float));
	}
	for (i=0;i<numallpasses;i++)
	{
		memset(x->x_bufallpassL[i], 0x0, x->x_allpasstuningL[i]*sizeof(t_float));
		memset(x->x_bufallpassR[i], 0x0, x->x_allpasstuningR[i]*sizeof(t_float));
	}
}

	// convert gain factor into dB
static float freeverb_getdb(float f)
{
    if (f <= 0)	// equation does not work for 0...
	{
		return (-96);	// ...so we output max. damping
	}
    else
    {
    	float val = (20./LOGTEN * log(f));
    	return (val);
    }
}

static void freeverb_print(t_freeverb *x)
{
	post("freeverb~:");
	if(x->x_bypass) {
		post("  bypass: on");
	} else post("  bypass: off");
	if(!freeverb_getmode(x)) {
		post("  mode: normal");
	} else post("  mode: freeze");
	post("  roomsize: %g", freeverb_getroomsize(x)*scaleroom+offsetroom);
	post("  damping: %g %%", freeverb_getdamp(x)*100);
	post("  width: %g %%", x->x_width * 100);
	post("  wet level: %g dB", freeverb_getdb(freeverb_getwet(x)*scalewet));
	post("  dry level: %g dB", freeverb_getdb(freeverb_getdry(x)*scaledry));
}

	// clean up
static void freeverb_free(t_freeverb *x)    
{
	int i;
#ifndef PD
	dsp_free((t_pxobject *)x);		// Free the object
#endif
	// free memory used by delay lines
	for(i = 0; i < numcombs; i++)
	{
		t_freebytes(x->x_bufcombL[i], x->x_combtuningL[i]*sizeof(t_float));
		t_freebytes(x->x_bufcombR[i], x->x_combtuningR[i]*sizeof(t_float));
	}

	for(i = 0; i < numallpasses; i++)
	{
		t_freebytes(x->x_bufallpassL[i], x->x_allpasstuningL[i]*sizeof(t_float));
		t_freebytes(x->x_bufallpassR[i], x->x_allpasstuningR[i]*sizeof(t_float));
	}
}

void *freeverb_new(t_floatarg f)
{
	int i;
	int sr = (int)sys_getsr();

#ifdef PD
    t_freeverb *x = (t_freeverb *)pd_new(freeverb_class);

	// add additional signal inlets and signal outlets
	inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);

    outlet_new(&x->x_obj, gensym("signal"));
    outlet_new(&x->x_obj, gensym("signal"));
#else	// Max/MSP
    t_freeverb *x = (t_freeverb *)newobject(freeverb_class);
    
    // zero out the struct, to be careful
    if(x)
    {
    	for(i = sizeof(t_pxobject); i < sizeof(t_freeverb); i++)
    		((char*)x)[i] = 0;
    }
    
    dsp_setup((t_pxobject *)x,2);	// two signal inlets
    
    // two signal outlets
    outlet_new((t_object *)x, "signal");
    outlet_new((t_object *)x, "signal");
#endif	
	// recalculate the reverb parameters in case we don't run at 44.1kHz
	for(i = 0; i < numcombs; i++)
	{
		x->x_combtuningL[i] = (int)(combtuningL[i] * sr / 44100);
		x->x_combtuningR[i] = (int)(combtuningR[i] * sr / 44100);
	}
	for(i = 0; i < numallpasses; i++)
	{
		x->x_allpasstuningL[i] = (int)(allpasstuningL[i] * sr / 44100);
		x->x_allpasstuningR[i] = (int)(allpasstuningL[i] * sr / 44100);
	}

	// get memory for delay lines
	for(i = 0; i < numcombs; i++)
	{
		x->x_bufcombL[i] = (t_float*) t_getbytes(x->x_combtuningL[i]*sizeof(t_float));
		x->x_bufcombR[i] = (t_float*) t_getbytes(x->x_combtuningR[i]*sizeof(t_float));
		x->x_combidxL[i] = 0;
		x->x_combidxR[i] = 0;
	}
	for(i = 0; i < numallpasses; i++)
	{
		x->x_bufallpassL[i] = (t_float*) t_getbytes(x->x_allpasstuningL[i]*sizeof(t_float));
		x->x_bufallpassR[i] = (t_float*) t_getbytes(x->x_allpasstuningR[i]*sizeof(t_float));
		x->x_allpassidxL[i] = 0;
		x->x_allpassidxR[i] = 0;
	}

	// set default values
	x->x_allpassfeedback = 0.5;
	x->x_skip = 1;	// we use every sample
	freeverb_setwet(x, initialwet);
	freeverb_setroomsize(x, initialroom);
	freeverb_setdry(x, initialdry);
	freeverb_setdamp(x, initialdamp);
	freeverb_setwidth(x, initialwidth);
	freeverb_setmode(x, initialmode);
	freeverb_setbypass(x, initialbypass);

	// buffers will be full of rubbish - so we MUST mute them
	freeverb_mute(x);

    return (x);
}

#ifdef PD
extern "C" void freeverb_tilde_setup(void)
{
    freeverb_class = class_new(gensym("freeverb~"), (t_newmethod)freeverb_new, (t_method)freeverb_free,
    	sizeof(t_freeverb), 0, A_DEFFLOAT, 0);
	CLASS_MAINSIGNALIN(freeverb_class, t_freeverb, x_float);
    class_addmethod(freeverb_class, (t_method)freeverb_dsp, gensym("dsp"), A_NULL);
    class_addmethod(freeverb_class, (t_method)freeverb_setroomsize, gensym("roomsize"), A_FLOAT, A_NULL);
    class_addmethod(freeverb_class, (t_method)freeverb_setdamp, gensym("damping"), A_FLOAT, A_NULL);
    class_addmethod(freeverb_class, (t_method)freeverb_setwidth, gensym("width"), A_FLOAT, A_NULL);
	class_addmethod(freeverb_class, (t_method)freeverb_setwet, gensym("wet"), A_FLOAT, A_NULL);
	class_addmethod(freeverb_class, (t_method)freeverb_setdry, gensym("dry"), A_FLOAT, A_NULL);
	class_addmethod(freeverb_class, (t_method)freeverb_setmode, gensym("freeze"), A_FLOAT, A_NULL);
	class_addmethod(freeverb_class, (t_method)freeverb_setbypass, gensym("bypass"), A_FLOAT, A_NULL);
	class_addmethod(freeverb_class, (t_method)freeverb_mute, gensym("clear"), A_NULL);
    class_addmethod(freeverb_class, (t_method)freeverb_print, gensym("print"), A_NULL);
    class_sethelpsymbol(freeverb_class, gensym("help-freeverb~.pd"));
	post(version);
}

#else
// ----------- Max/MSP -----------
void freeverb_assist(t_freeverb *x, void *b, long m, long a, char *s)
{
	switch(m) {
		case 1: // inlet
			switch(a) {
				case 0:
				sprintf(s, "(signal/message) Left Input & Control Messages");
				break;
				case 1:
				sprintf(s, "(signal) Right Input");
				break;
			}
		break;
		case 2: // outlet
			switch(a) {
				case 0:
				sprintf(s, "(signal) Left Output");
				break;
				case 1:
				sprintf(s, "(signal) Right Output");
				break;
			}
		break;
	}

}

extern "C" void main(void)
{
	setup((t_messlist **)&freeverb_class,(method)freeverb_new, (method)freeverb_free, 
		(short)sizeof(t_freeverb), 0L, A_DEFFLOAT, 0);
	addmess((method)freeverb_dsp, "dsp", A_CANT, 0);
	addmess((method)freeverb_assist, "assist", A_CANT, 0);
	addmess((method)freeverb_setroomsize, "roomsize", A_FLOAT, 0);
	addmess((method)freeverb_setdamp, "damping", A_FLOAT, 0);
	addmess((method)freeverb_setwidth, "width", A_FLOAT, 0);
	addmess((method)freeverb_setwet, "wet", A_FLOAT, 0);
	addmess((method)freeverb_setdry, "dry", A_FLOAT, 0);
	addmess((method)freeverb_setmode, "freeze", A_FLOAT, 0);
	addmess((method)freeverb_setbypass, "bypass", A_FLOAT, 0);
	addmess((method)freeverb_mute, "clear", 0);
	addmess((method)freeverb_print, "print", 0);
	dsp_initclass();
	finder_addclass("MSP Delays","freeverb~");
	post(version);
}
#endif
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--- NEW FILE: LICENSE ---
		    GNU GENERAL PUBLIC LICENSE
		       Version 2, June 1991

 Copyright (C) 1989, 1991 Free Software Foundation, Inc.
                       59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 Everyone is permitted to copy and distribute verbatim copies
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anything that is normally distributed (in either source or binary
form) with the major components (compiler, kernel, and so on) of the
operating system on which the executable runs, unless that component
itself accompanies the executable.

If distribution of executable or object code is made by offering
access to copy from a designated place, then offering equivalent
access to copy the source code from the same place counts as
distribution of the source code, even though third parties are not
compelled to copy the source along with the object code.


  4. You may not copy, modify, sublicense, or distribute the Program
except as expressly provided under this License.  Any attempt
otherwise to copy, modify, sublicense or distribute the Program is
void, and will automatically terminate your rights under this License.
However, parties who have received copies, or rights, from you under
this License will not have their licenses terminated so long as such
parties remain in full compliance.

  5. You are not required to accept this License, since you have not
signed it.  However, nothing else grants you permission to modify or
distribute the Program or its derivative works.  These actions are
prohibited by law if you do not accept this License.  Therefore, by
modifying or distributing the Program (or any work based on the
Program), you indicate your acceptance of this License to do so, and
all its terms and conditions for copying, distributing or modifying
the Program or works based on it.

  6. Each time you redistribute the Program (or any work based on the
Program), the recipient automatically receives a license from the
original licensor to copy, distribute or modify the Program subject to
these terms and conditions.  You may not impose any further
restrictions on the recipients' exercise of the rights granted herein.
You are not responsible for enforcing compliance by third parties to
this License.

  7. If, as a consequence of a court judgment or allegation of patent
infringement or for any other reason (not limited to patent issues),
conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License.  If you cannot
distribute so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you
may not distribute the Program at all.  For example, if a patent
license would not permit royalty-free redistribution of the Program by
all those who receive copies directly or indirectly through you, then
the only way you could satisfy both it and this License would be to
refrain entirely from distribution of the Program.

If any portion of this section is held invalid or unenforceable under
any particular circumstance, the balance of the section is intended to
apply and the section as a whole is intended to apply in other
circumstances.

It is not the purpose of this section to induce you to infringe any
patents or other property right claims or to contest validity of any
such claims; this section has the sole purpose of protecting the
integrity of the free software distribution system, which is
implemented by public license practices.  Many people have made
generous contributions to the wide range of software distributed
through that system in reliance on consistent application of that
system; it is up to the author/donor to decide if he or she is willing
to distribute software through any other system and a licensee cannot
impose that choice.

This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.


  8. If the distribution and/or use of the Program is restricted in
certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
those countries, so that distribution is permitted only in or among
countries not thus excluded.  In such case, this License incorporates
the limitation as if written in the body of this License.

  9. The Free Software Foundation may publish revised and/or new versions
of the General Public License from time to time.  Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.

Each version is given a distinguishing version number.  If the Program
specifies a version number of this License which applies to it and "any
later version", you have the option of following the terms and conditions
either of that version or of any later version published by the Free
Software Foundation.  If the Program does not specify a version number of
this License, you may choose any version ever published by the Free Software
Foundation.

  10. If you wish to incorporate parts of the Program into other free
programs whose distribution conditions are different, write to the author
to ask for permission.  For software which is copyrighted by the Free
Software Foundation, write to the Free Software Foundation; we sometimes
make exceptions for this.  Our decision will be guided by the two goals
of preserving the free status of all derivatives of our free software and
of promoting the sharing and reuse of software generally.

			    NO WARRANTY

  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
REPAIR OR CORRECTION.

  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.

		     END OF TERMS AND CONDITIONS


	    How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) 19yy  <name of author>

    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


Also add information on how to contact you by electronic and paper mail.

If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:

    Gnomovision version 69, Copyright (C) 19yy name of author
    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License.  Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.

You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary.  Here is a sample; alter the names:

  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
  `Gnomovision' (which makes passes at compilers) written by James Hacker.

  <signature of Ty Coon>, 1 April 1989
  Ty Coon, President of Vice

This General Public License does not permit incorporating your program into
proprietary programs.  If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library.  If this is what you want to do, use the GNU Library General
Public License instead of this License.






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