summaryrefslogtreecommitdiff
path: root/muse_qt4_evolution/synti/zynaddsubfx/Effects/Echo.C
blob: a35ee1bad6fdf4a4dd88a7c4a6e5be88f297f429 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
/*
  ZynAddSubFX - a software synthesizer
 
  Echo.C - Echo effect
  Copyright (C) 2002-2005 Nasca Octavian Paul
  Author: Nasca Octavian Paul

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License 
  as published by the Free Software Foundation.

  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 (version 2) for more details.

  You should have received a copy of the GNU General Public License (version 2)
  along with this program; if not, write to the Free Software Foundation,
  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

*/

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "Echo.h"

Echo::Echo(int insertion_,REALTYPE *efxoutl_,REALTYPE *efxoutr_){
    efxoutl=efxoutl_;
    efxoutr=efxoutr_;
    filterpars=NULL;

    insertion=insertion_;
    //default values
    Ppreset=0;
    Pvolume=50;
    Ppanning=64; 
    Pdelay=60;
    Plrdelay=100; 
    Plrcross=100; 
    Pfb=40;
    Phidamp=60;
    
    ldelay=NULL;
    rdelay=NULL;
    lrdelay=0;

    setpreset(Ppreset);    	   
    cleanup();
};

Echo::~Echo(){
    delete[] ldelay;
    delete[] rdelay;
};

/*
 * Cleanup the effect
 */
void Echo::cleanup(){
    int i;
    for (i=0;i<dl;i++) ldelay[i]=0.0;
    for (i=0;i<dr;i++) rdelay[i]=0.0;
    oldl=0.0;
    oldr=0.0;
};


/*
 * Initialize the delays
 */
void Echo::initdelays(){
    kl=0;kr=0;
    dl=delay-lrdelay;if (dl<1) dl=1;
    dr=delay+lrdelay;if (dr<1) dr=1;
    
    if (ldelay!=NULL) delete [] ldelay;
    if (rdelay!=NULL) delete [] rdelay;
    ldelay=new REALTYPE[dl];
    rdelay=new REALTYPE[dr];

    cleanup();
};

/*
 * Effect output
 */
void Echo::out(REALTYPE *smpsl,REALTYPE *smpsr){
    int i;
    REALTYPE l,r,ldl,rdl;

    for (i=0;i<SOUND_BUFFER_SIZE;i++){
	ldl=ldelay[kl];
	rdl=rdelay[kr];
	l=ldl*(1.0-lrcross)+rdl*lrcross;
	r=rdl*(1.0-lrcross)+ldl*lrcross;
	ldl=l;rdl=r;
	
	efxoutl[i]=ldl*2.0;
	efxoutr[i]=rdl*2.0;
	ldl=smpsl[i]*panning-ldl*fb;
	rdl=smpsr[i]*(1.0-panning)-rdl*fb;

	//LowPass Filter
	ldelay[kl]=ldl=ldl*hidamp+oldl*(1.0-hidamp);
	rdelay[kr]=rdl=rdl*hidamp+oldr*(1.0-hidamp);
	oldl=ldl;
	oldr=rdl;

	if (++kl>=dl) kl=0;
	if (++kr>=dr) kr=0;
    };
    
};


/*
 * Parameter control
 */
void Echo::setvolume(unsigned char Pvolume){
    this->Pvolume=Pvolume;

    if (insertion==0) {
	outvolume=pow(0.01,(1.0-Pvolume/127.0))*4.0;
	volume=1.0;
    } else {
	volume=outvolume=Pvolume/127.0;
    };
    if (Pvolume==0) cleanup();

};

void Echo::setpanning(unsigned char Ppanning){
    this->Ppanning=Ppanning;
    panning=(Ppanning+0.5)/127.0;
};

void Echo::setdelay(unsigned char Pdelay){
    this->Pdelay=Pdelay;
    delay=1+(int)(Pdelay/127.0*SAMPLE_RATE*1.5);//0 .. 1.5 sec
    initdelays();
};

void Echo::setlrdelay(unsigned char Plrdelay){
    REALTYPE tmp;
    this->Plrdelay=Plrdelay;    
    tmp=(pow(2,fabs(Plrdelay-64.0)/64.0*9)-1.0)/1000.0*SAMPLE_RATE;
    if (Plrdelay<64.0) tmp=-tmp;
    lrdelay=(int) tmp;
    initdelays();
};

void Echo::setlrcross(unsigned char Plrcross){
    this->Plrcross=Plrcross;
    lrcross=Plrcross/127.0*1.0;
};

void Echo::setfb(unsigned char Pfb){
    this->Pfb=Pfb;
    fb=Pfb/128.0;
};

void Echo::sethidamp(unsigned char Phidamp){
    this->Phidamp=Phidamp;
    hidamp=1.0-Phidamp/127.0;
};

void Echo::setpreset(unsigned char npreset){
    const int PRESET_SIZE=7;
    const int NUM_PRESETS=9;
    unsigned char presets[NUM_PRESETS][PRESET_SIZE]={
	//Echo 1
	{67,64,35,64,30,59,0},
	//Echo 2
	{67,64,21,64,30,59,0},
	//Echo 3
	{67,75,60,64,30,59,10},
	//Simple Echo
	{67,60,44,64,30,0,0},
	//Canyon
	{67,60,102,50,30,82,48},
	//Panning Echo 1
	{67,64,44,17,0,82,24},
	//Panning Echo 2
	{81,60,46,118,100,68,18},
	//Panning Echo 3
	{81,60,26,100,127,67,36},
	//Feedback Echo
	{62,64,28,64,100,90,55}};


    if (npreset>=NUM_PRESETS) npreset=NUM_PRESETS-1;
    for (int n=0;n<PRESET_SIZE;n++) changepar(n,presets[npreset][n]);
    if (insertion!=0) changepar(0,presets[npreset][0]/2);//lower the volume if this is insertion effect
    Ppreset=npreset;
};


void Echo::changepar(int npar,unsigned char value){
    switch (npar){
	case 0: setvolume(value);
		break;
	case 1: setpanning(value);
		break;
	case 2: setdelay(value);
		break;
	case 3: setlrdelay(value);
		break;
	case 4: setlrcross(value);
		break;
	case 5: setfb(value);
		break;
	case 6: sethidamp(value);
		break;
    };
};

unsigned char Echo::getpar(int npar){
    switch (npar){
	case 0: return(Pvolume);
		break;
	case 1: return(Ppanning);
		break;
	case 2: return(Pdelay);
		break;
	case 3: return(Plrdelay);
		break;
	case 4: return(Plrcross);
		break;
	case 5: return(Pfb);
		break;
	case 6: return(Phidamp);
		break;
    };
    return(0);//in case of bogus parameter number
};