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/*
* 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);
}
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