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
|
/*
* Diverse Bristol audio routines.
* Copyright (c) by Nick Copeland <nickycopeland@hotmail.com> 1996,2012
*
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
/*#define BRISTOL_DBG */
/*
* Need to have basic template for an operator. Will consist of
*
* noiseinit()
* operate()
* reset()
* destroy()
*
* destroy() is in the library.
*
* Operate will be called when all the inputs have been loaded, and the result
* will be an output buffer written to the next operator.
*/
#include <stdlib.h>
#include "bristol.h"
#include "noise.h"
/*
* The name of this operator, IO count, and IO names.
*/
#define OPNAME "Noise"
#define OPDESCRIPTION "Noise Generator"
#define PCOUNT 3
#define IOCOUNT 1
/* Improves with buffer size since smaller sizes are less random */
#define NOISESIZE 65536
#define NOISE_OUT_IND 0
/*
* Reset any local memory information.
*/
static int destroy(bristolOP *operator)
{
#ifdef BRISTOL_DBG
printf("reset(%x)\n", operator);
#endif
/*
* Unmalloc anything we added to this structure
*/
bristolfree(operator->specs);
/*
* Free any local memory. We should also free ourselves, since we did the
* initial allocation.
*/
cleanup(operator);
return(0);
}
/*
* Reset any local memory information.
*/
static int reset(bristolOP *operator, bristolOPParams *param)
{
#ifdef BRISTOL_DBG
printf("noisereset(%x)\n", operator);
#endif
param->param[0].float_val = 0.000001;
param->param[1].int_val = 0;
param->param[2].int_val = 0.25;
param->param[3].int_val = 1.0;
return(0);
}
/*
* Alter an internal parameter of an operator.
*/
static int param(bristolOP *operator, bristolOPParams *param,
unsigned char index, float value)
{
#ifdef BRISTOL_DBG
printf("noiseparam(%i, %f)\n", index, value);
#endif
if (index == 0)
param->param[index].float_val = value * 0.00025;
if (index == 1)
{
if (value == 0)
param->param[index].int_val = 0;
else
param->param[index].int_val = 1;
}
if (index == 2)
param->param[index].float_val = value;
return(0);
}
/*
static static float scale = 2.0f / 0xffffffff;
static float scale = 24.0f / 0xffffffff;
*/
static float scale = 0.0001;
int x1 = 0x67452301;
int x2 = 0xefcdab89;
static int
gennoise(register bristolOP *operator, bristolVoice *voice,
bristolOPParams *param,
void *lcl)
{
bristolNOISE *specs = (bristolNOISE *) operator->specs;
register int i = specs->spec.io[NOISE_OUT_IND].samplecount;
register float level, *ob;
bristolNOISElocal * local = lcl;
register float lp, lsv;
ob = specs->spec.io[NOISE_OUT_IND].buf;
level = param->param[0].float_val * scale;
while (i-=4)
{
x1 ^= x2; *ob++ += x2 * level; x2 += x1;
x1 ^= x2; *ob++ += x2 * level; x2 += x1;
x1 ^= x2; *ob++ += x2 * level; x2 += x1;
x1 ^= x2; *ob++ += x2 * level; x2 += x1;
}
if (param->param[1].int_val == 0)
return(0);
lp = param->param[2].float_val;
lsv = local->coff;
for (i = specs->spec.io[NOISE_OUT_IND].samplecount,
ob = specs->spec.io[NOISE_OUT_IND].buf;
i > 0;
i--, ob++)
*ob = (lsv += ((*ob - lsv) * lp));
local->coff = lsv;
return(0);
}
/*
* Setup any variables in our OP structure, in our IO structures, and malloc
* any memory we need.
*/
bristolOP *
noiseinit(bristolOP **operator, int index, int samplerate, int samplecount)
{
bristolNOISE *specs;
#ifdef BRISTOL_DBG
printf("noiseinit(%x(%x), %i, %i, %i)\n",
operator, *operator, index, samplerate, samplecount);
#endif
*operator = bristolOPinit(operator, index, samplecount);
/*
* Then the local parameters specific to this operator. These will be
* the same for each operator, but must be inited in the local code.
*/
(*operator)->operate = gennoise;
(*operator)->destroy = destroy;
(*operator)->reset = reset;
(*operator)->param = param;
specs = (bristolNOISE *) bristolmalloc0(sizeof(bristolNOISE));
(*operator)->specs = (bristolOPSpec *) specs;
(*operator)->size = sizeof(bristolNOISE);
/*
* These are specific to this operator, and will need to be altered for
* each operator.
*/
specs->spec.opname = OPNAME;
specs->spec.description = OPDESCRIPTION;
specs->spec.pcount = PCOUNT;
specs->spec.iocount = IOCOUNT;
specs->spec.localsize = sizeof(bristolNOISElocal);
specs->spec.param[0].pname = "gain";
specs->spec.param[0].description = "output gain on signal";
specs->spec.param[0].type = BRISTOL_FLOAT;
specs->spec.param[0].low = 0;
specs->spec.param[0].high = 1;
specs->spec.param[0].flags = BRISTOL_ROTARY|BRISTOL_SLIDER;
specs->spec.param[1].pname = "White/Pink";
specs->spec.param[1].description = "white pink";
specs->spec.param[1].type = BRISTOL_ENUM;
specs->spec.param[1].low = 0;
specs->spec.param[1].high = 1;
specs->spec.param[1].flags = BRISTOL_BUTTON;
specs->spec.param[2].pname = "White/Pink";
specs->spec.param[2].description = "white pink filtering";
specs->spec.param[2].type = BRISTOL_FLOAT;
specs->spec.param[2].low = 0;
specs->spec.param[2].high = 1;
specs->spec.param[2].flags = BRISTOL_ROTARY|BRISTOL_SLIDER;
/*
* Now fill in the dco IO specs.
*/
specs->spec.io[0].ioname = "output";
specs->spec.io[0].description = "Noise Output Signal";
specs->spec.io[0].samplerate = samplerate;
specs->spec.io[0].samplecount = samplecount;
specs->spec.io[0].flags = BRISTOL_AC|BRISTOL_OUTPUT;
return(*operator);
}
|