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/* Freebirth
* Copyright (C) 1999 topher lafata <topher@topher.com>,
* Jake Donham <jake@bitmechanic.com>
*
* 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 (see COPYING); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "mixer.h"
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
void mixer_set_amplitude(mixer *this,int amp,int index)
{
/* make sure we don't run off the end of the array */
if(index >= this->length || index < 0)
return;
if(amp == MUTE_SWITCH)
this->mute_map[index] = - (this->mute_map[index]);
else
this->amplitude[index] = amp;
}
void mixer_next_buffer(mixer *this) {
this->next = 1;
}
extern mixer *aux_1;
sample *mixer_get_buffer(mixer *this)
{
int i,x;
if (this->next) {
this->next = 0;
for(x = 0; x < this->length;x++)
this->bufs[x] = this->source[x]->get_buffer(this->source[x]);
for(i = 0; i < TBASS_BUFF_SIZE;i++) {
long tmp = 0;
for (x = 0; x < this->length; x++)
tmp += (((long)(this->bufs[x][i] * this->amplitude[x]))/ MIX_MAX_AMP);
/*PATCH BY: scott manley <spm@star.arm.ac.uk> */
this->buffer[i] = tmp;
}
}
return this->buffer;
}
static sample_producer **get_children(mixer *this)
{
return this->source;
}
static char **get_header(mixer *this)
{
if (!this->header) {
int i;
int hdr_size;
hdr_size = this->length * 2; /*one for amp vals, one for mix_map vals */
this->header = (char **)malloc(sizeof(char *) * (hdr_size + 1));
for (i=0; i < this->length; i++) {
this->header[i] = (char *)malloc(sizeof(char) * 80);
sprintf(this->header[i],
"int $n_amp%d = ((mixer *)$t)->amplitude[%d];",
i, i);
}
for(i = 0; i< this->length;i++)
{
int index = this->length + i;
this->header[index] = (char *)malloc(sizeof(char) * 80);
sprintf(this->header[index],
"int $n_mute%d = ((mixer *)$t)->mute_map[%d];",
i, i);
}
this->header[hdr_size] = NULL;
}
return this->header;
}
static char **get_code(mixer *this)
{
if (!this->code) {
int i;
char *cp;
this->code = (char **)malloc(sizeof(char *) * 3);
// XXX make sure this is enough memory
this->code[0] = (char *)malloc(sizeof(char) * (this->length * 40 + 50));
cp = this->code[0];
for(i = 0; i < this->length;i++)
cp += sprintf(cp,"if($n_mute%d > 0)\n\t $n_amp%d = 0;\n",i,i);
this->code[1] = (char *)malloc(sizeof(char) * (this->length * 40 + 50));
cp = this->code[1];
cp += sprintf(cp, "$o = ");
for (i=0; i < this->length; i++) {
cp += sprintf(cp, "($i%d * $n_amp%d / MIX_MAX_AMP)%s",
i, i, (i == this->length - 1) ? "" : " + ");
}
sprintf(cp, ";");
this->code[2] = NULL;
}
return this->code;
}
static char **get_footer(mixer *this)
{
static char *footer[] = { NULL };
return footer;
}
mixer* mixer_new(sample_producer **sources)
{
int i;
sample_producer **tmp = sources;
mixer* out = (mixer *)malloc(sizeof(mixer));
out->source = sources;
out->length = 0;
while (*tmp++) out->length++;
out->amplitude = (int *)malloc(sizeof(int) * out->length);
out->get_buffer = mixer_get_buffer;
out->next_buffer = mixer_next_buffer;
out->get_children = get_children;
out->get_header = get_header;
out->get_code = get_code;
out->get_footer = get_footer;
out->header = NULL;
out->code = NULL;
out->next = 0;
out->buffer = (sample*)malloc(sizeof(sample) * TBASS_BUFF_SIZE);
out->bufs = (sample **)malloc(sizeof(sample *) * out->length);
out->mute_map = (int *) malloc(sizeof(int) * out->length);
for(i=0; i < out->length; i++)
{
out->amplitude[i] = 0;
out->mute_map[i] = -1;
}
return out;
}
/*
Local Variables:
mode: font-lock
End:
*/
/*compression stuff? */
/* if(tmp >=0)
this->buffer[i] = MIX_MAX_AMP * pow((double)tmp/(double)MIX_MAX_AMP,0.9);
else
this->buffer[i] = -MIX_MAX_AMP * pow((double)-tmp/(double)MIX_MAX_AMP,0.9);
*/
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