Hi All,
I asked Kyle Buza (of mmonoplayer) about adding the sources for his
console soundchip emulator externals to Pd-CVS so that they could be
included in Pd-Extended. He's sending me the sources as he digs them
up. Most of them are written for Max, but I was hoping that someone
would be interested in helping me try to convert those to Pd.
I don't have Dev access, so someone else will have to actually put
them in CVS, in say externals/mmonoplayer.
The first is attached. This is of course already for Pd.
/*****************************************************************************/
/* */
/* TIA Chip Sound Simulator for PD */
/* Purpose: To emulate the sound generation hardware of the Atari TIA chip. */
/* Author(s): Kyle Buza, Ron Fries */
/* */
/*****************************************************************************/
#include <stdlib.h>
#include "m_pd.h"
static t_class *atari_2600_class;
typedef signed char Int8;
typedef signed int Int16;
#ifdef WIN32
#define int8 char
#define int16 short
#define int32 int
#else
#define int8 char
#define int16 int
#define int32 long
#endif
#define uint8 unsigned int8
#define uint16 unsigned int16
#define uint32 unsigned int32
/* definitions for AUDCx (15, 16) */
#define SET_TO_1 0x00 /* 0000 */
#define POLY4 0x01 /* 0001 */
#define DIV31_POLY4 0x02 /* 0010 */
#define POLY5_POLY4 0x03 /* 0011 */
#define PURE 0x04 /* 0100 */
#define PURE2 0x05 /* 0101 */
#define DIV31_PURE 0x06 /* 0110 */
#define POLY5_2 0x07 /* 0111 */
#define POLY9 0x08 /* 1000 */
#define POLY5 0x09 /* 1001 */
#define DIV31_POLY5 0x0a /* 1010 */
#define POLY5_POLY5 0x0b /* 1011 */
#define DIV3_PURE 0x0c /* 1100 */
#define DIV3_PURE2 0x0d /* 1101 */
#define DIV93_PURE 0x0e /* 1110 */
#define DIV3_POLY5 0x0f /* 1111 */
#define DIV3_MASK 0x0c
#define AUDC0 0x15
#define AUDC1 0x16
#define AUDF0 0x17
#define AUDF1 0x18
#define AUDV0 0x19
#define AUDV1 0x1a
/* the size (in entries) of the 4 polynomial tables */
#define POLY4_SIZE 0x000f
#define POLY5_SIZE 0x001f
#define POLY9_SIZE 0x01ff
/* channel definitions */
#define CHAN1 0
#define CHAN2 1
#define FALSE 0
#define TRUE 1
/* Initialze the bit patterns for the polynomials. */
/* The 4bit and 5bit patterns are the identical ones used in the tia chip. */
/* Though the patterns could be packed with 8 bits per byte, using only a */
/* single bit per byte keeps the math simple, which is important for */
/* efficient processing. */
static uint8 Bit4[POLY4_SIZE] =
{ 1,1,0,1,1,1,0,0,0,0,1,0,1,0,0 };
static uint8 Bit5[POLY5_SIZE] =
{ 0,0,1,0,1,1,0,0,1,1,1,1,1,0,0,0,1,1,0,1,1,1,0,1,0,1,0,0,0,0,1 };
/* I've treated the 'Div by 31' counter as another polynomial because of */
/* the way it operates. It does not have a 50% duty cycle, but instead */
/* has a 13:18 ratio (of course, 13+18 = 31). This could also be */
/* implemented by using counters. */
static uint8 Div31[POLY5_SIZE] =
{ 0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0 };
typedef struct _atari_2600
{
t_object x_obj;
t_float x15;
t_float x16;
t_float x17;
t_float x18;
t_float x19;
t_float x1a;
long Bit9[POLY9_SIZE];
long P4[2];
long P5[2];
long P9[2];
long Div_n_cnt[2];
long Div_n_max[2];
long AUDC[2];
long AUDF[2];
long AUDV[2];
long Outvol[2];
long volume;
} t_atari_2600;
void *atari_2600_new(void);
t_int *atari_2600_perform(t_int *w);
void atari_2600_dsp(t_atari_2600 *x, t_signal **sp, short *count);
void Tia_sound_init(t_atari_2600 *x, uint16 sample_freq, uint16 playback_freq);
void Update_tia_sound(t_atari_2600 *x, uint16 addr, uint8 val);
void Tia_process (t_atari_2600 *x, t_float *buffer, uint16 n);
void atari_2600_tilde_setup(void)
{
atari_2600_class = class_new(gensym("atari_2600~"),
(t_newmethod)atari_2600_new, 0, sizeof(t_atari_2600),
CLASS_DEFAULT, A_DEFFLOAT, 0);
class_addmethod(atari_2600_class, (t_method)atari_2600_dsp, gensym("dsp"), 0);
}
void *atari_2600_new(void)
{
t_atari_2600 *x = (t_atari_2600 *)pd_new(atari_2600_class);
x->x15 = 0;
x->x16 = 0;
x->x17 = 0;
x->x18 = 0;
x->x19 = 0;
x->x1a = 0;
floatinlet_new(&x->x_obj, &x->x15);
floatinlet_new(&x->x_obj, &x->x17);
floatinlet_new(&x->x_obj, &x->x19);
floatinlet_new(&x->x_obj, &x->x16);
floatinlet_new(&x->x_obj, &x->x18);
floatinlet_new(&x->x_obj, &x->x1a);
outlet_new(&x->x_obj, &s_signal);
Tia_sound_init(x, 32000, 32000);
return (x);
}
void atari_2600_dsp(t_atari_2600 *x, t_signal **sp, short *count)
{
dsp_add(atari_2600_perform, 3, sp[0]->s_vec, sp[0]->s_n, x);
}
t_int *atari_2600_perform(t_int *w)
{
t_float *outL = (t_float *)(w[1]);
t_atari_2600 *x = (t_atari_2600 *)(w[3]);
Update_tia_sound(x, 0x15, x->x15);
Update_tia_sound(x, 0x16, x->x16);
Update_tia_sound(x, 0x17, x->x17);
Update_tia_sound(x, 0x18, x->x18);
Update_tia_sound(x, 0x19, x->x19);
Update_tia_sound(x, 0x1a, x->x1a);
Tia_process(x, outL, (int)(w[2]));
return (w + 4);
}
/*****************************************************************************/
/* */
/* Module: TIA Chip Sound Simulator */
/* Purpose: To emulate the sound generation hardware of the Atari TIA chip. */
/* Author: Ron Fries */
/* */
/* Revision History: */
/* 10-Sep-96 - V1.0 - Initial Release */
/* 14-Jan-97 - V1.1 - Cleaned up sound output by eliminating counter */
/* reset. */
/* */
/*****************************************************************************/
/* */
/* License Information and Copyright Notice */
/* ======================================== */
/* */
/* TiaSound is Copyright(c) 1996 by Ron Fries */
/* */
/* This library is free software; you can redistribute it and/or modify it */
/* under the terms of version 2 of the GNU Library General Public License */
/* as published by the Free Software Foundation. */
/* */
/* This library 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 Library */
/* General Public License for more details. */
/* To obtain a copy of the GNU Library General Public License, write to the */
/* Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
/* */
/* Any permitted reproduction of these routines, in whole or in part, must */
/* bear this legend. */
/* */
/*****************************************************************************/
void Tia_sound_init (t_atari_2600 *x, uint16 sample_freq, uint16 playback_freq)
{
uint8 chan;
int16 n;
/* fill the 9bit polynomial with random bits */
for (n=0; n<POLY9_SIZE; n++)
{
x->Bit9[n] = rand() & 0x01; /* fill poly9 with random bits */
}
/* initialize the local globals */
for (chan = CHAN1; chan <= CHAN2; chan++)
{
x->Outvol[chan] = 0;
x->Div_n_cnt[chan] = 0;
x->Div_n_max[chan] = 0;
x->AUDC[chan] = 0;
x->AUDF[chan] = 0;
x->AUDV[chan] = 0;
x->P4[chan] = 0;
x->P5[chan] = 0;
x->P9[chan] = 0;
}
x->volume = 100;
}
void Update_tia_sound(t_atari_2600 *x, uint16 addr, uint8 val)
{
uint16 new_val = 0;
uint8 chan;
/* determine which address was changed */
switch (addr)
{
case AUDC0:
x->AUDC[0] = val & 0x0f;
chan = 0;
break;
case AUDC1:
x->AUDC[1] = val & 0x0f;
chan = 1;
break;
case AUDF0:
x->AUDF[0] = val & 0x1f;
chan = 0;
break;
case AUDF1:
x->AUDF[1] = val & 0x1f;
chan = 1;
break;
case AUDV0:
x->AUDV[0] = (val & 0x0f) << 3;
chan = 0;
break;
case AUDV1:
x->AUDV[1] = (val & 0x0f) << 3;
chan = 1;
break;
default:
chan = 255;
break;
}
/* if the output value changed */
if (chan != 255)
{
/* an AUDC value of 0 is a special case */
if (x->AUDC[chan] == SET_TO_1)
{
/* indicate the clock is zero so no processing will occur */
new_val = 0;
/* and set the output to the selected volume */
x->Outvol[chan] = x->AUDV[chan];
}
else
{
/* otherwise calculate the 'divide by N' value */
new_val = x->AUDF[chan] + 1;
/* if bits 2 & 3 are set, then multiply the 'div by n' count by 3 */
if ((x->AUDC[chan] & DIV3_MASK) == DIV3_MASK)
{
new_val *= 3;
}
}
/* only reset those channels that have changed */
if (new_val != x->Div_n_max[chan])
{
/* reset the divide by n counters */
x->Div_n_max[chan] = new_val;
/* if the channel is now volume only or was volume only */
if ((x->Div_n_cnt[chan] == 0) || (new_val == 0))
{
/* reset the counter (otherwise let it complete the previous) */
x->Div_n_cnt[chan] = new_val;
}
}
}
}
void Tia_process(t_atari_2600 *x, t_float *buffer, uint16 n)
{
uint8 audc0,audv0,audc1,audv1;
uint8 div_n_cnt0,div_n_cnt1;
uint8 p5_0, p5_1,outvol_0,outvol_1;
audc0 = x->AUDC[0];
audv0 = x->AUDV[0];
audc1 = x->AUDC[1];
audv1 = x->AUDV[1];
/* make temporary local copy */
p5_0 = x->P5[0];
p5_1 = x->P5[1];
outvol_0 = x->Outvol[0];
outvol_1 = x->Outvol[1];
div_n_cnt0 = x->Div_n_cnt[0];
div_n_cnt1 = x->Div_n_cnt[1];
/* loop until the buffer is filled */
while (n)
{
/* Process channel 0 */
if (div_n_cnt0 > 1)
{
div_n_cnt0--;
}
else if (div_n_cnt0 == 1)
{
div_n_cnt0 = x->Div_n_max[0];
/* the P5 counter has multiple uses, so we inc it here */
p5_0++;
if (p5_0 == POLY5_SIZE)
p5_0 = 0;
/* check clock modifier for clock tick */
if (((audc0 & 0x02) == 0) ||
(((audc0 & 0x01) == 0) && Div31[p5_0]) ||
(((audc0 & 0x01) == 1) && Bit5[p5_0]))
{
if (audc0 & 0x04) /* pure modified clock selected */
{
if (outvol_0) /* if the output was set */
outvol_0 = 0; /* turn it off */
else {
outvol_0 = audv0; /* else turn it on */
}
}
else if (audc0 & 0x08) /* check for p5/p9 */
{
if (audc0 == POLY9) /* check for poly9 */
{
/* inc the poly9 counter */
x->P9[0]++;
if (x->P9[0] == POLY9_SIZE)
x->P9[0] = 0;
if (x->Bit9[x->P9[0]]) {
outvol_0 = audv0;
}
else
outvol_0 = 0;
}
else /* must be poly5 */
{
if (Bit5[p5_0]) {
outvol_0 = audv0;
}
else
outvol_0 = 0;
}
}
else /* poly4 is the only remaining option */
{
/* inc the poly4 counter */
x->P4[0]++;
if (x->P4[0] == POLY4_SIZE)
x->P4[0] = 0;
if (Bit4[x->P4[0]]) {
outvol_0 = audv0;
}
else
outvol_0 = 0;
}
}
}
/* Process channel 1 */
if (div_n_cnt1 > 1)
{
div_n_cnt1--;
}
else if (div_n_cnt1 == 1)
{
div_n_cnt1 = x->Div_n_max[1];
/* the P5 counter has multiple uses, so we inc it here */
p5_1++;
if (p5_1 == POLY5_SIZE)
p5_1 = 0;
/* check clock modifier for clock tick */
if (((audc1 & 0x02) == 0) ||
(((audc1 & 0x01) == 0) && Div31[p5_1]) ||
(((audc1 & 0x01) == 1) && Bit5[p5_1]))
{
if (audc1 & 0x04) /* pure modified clock selected */
{
if (outvol_1) /* if the output was set */
outvol_1 = 0; /* turn it off */
else
outvol_1 = audv1; /* else turn it on */
}
else if (audc1 & 0x08) /* check for p5/p9 */
{
if (audc1 == POLY9) /* check for poly9 */
{
/* inc the poly9 counter */
x->P9[1]++;
if (x->P9[1] == POLY9_SIZE)
x->P9[1] = 0;
if (x->Bit9[x->P9[1]])
outvol_1 = audv1;
else
outvol_1 = 0;
}
else /* must be poly5 */
{
if (Bit5[p5_1])
outvol_1 = audv1;
else
outvol_1 = 0;
}
}
else /* poly4 is the only remaining option */
{
/* inc the poly4 counter */
x->P4[1]++;
if (x->P4[1] == POLY4_SIZE)
x->P4[1] = 0;
if (Bit4[x->P4[1]])
outvol_1 = audv1;
else
outvol_1 = 0;
}
}
}
{
uint32 val = ((((uint32)outvol_0 + (uint32)outvol_1) * x->volume)/100);
float va = (((float)val) - 100.0)/100.0;
*(buffer++) = va;
n--;
}
}
/* save for next round */
x->P5[0] = p5_0;
x->P5[1] = p5_1;
x->Outvol[0] = outvol_0;
x->Outvol[1] = outvol_1;
x->Div_n_cnt[0] = div_n_cnt0;
x->Div_n_cnt[1] = div_n_cnt1;
}
