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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 "all_pass.h"
#include <stdlib.h>
#include <string.h>
#define SAMPLE_RATE 44100
void all_pass_next_buffer(all_pass *this)
{
this->next = 1;
}
sample *all_pass_get_buffer(all_pass *this)
{
int i;
sample *i_buf;
if (this->next) {
this->next = 0;
i_buf = this->input->get_buffer(this->input);
for(i = 0; i < TBASS_BUFF_SIZE;i++)
{
sample s;
if(this->d_index >= this->delay_size)
this->d_index = 0;
/* this->buffer[i] =
(long)this->delay_buffer[this->d_index] *
(MAX_FEEDBACK * MAX_FEEDBACK - this->feedback * this->feedback) /
(MAX_FEEDBACK * MAX_FEEDBACK) +
(i_buf[i] * -this->feedback / MAX_FEEDBACK);
*/
/*I just changed this...I believe this is now what an all pass
should actually d0 -toph */
this->buffer[i] =
(long)this->delay_buffer[this->d_index] +
(i_buf[i] * -this->feedback / MAX_FEEDBACK);
s = i_buf[i] + (long)this->delay_buffer[this->d_index] *
this->feedback / MAX_FEEDBACK;
this->delay_buffer[this->d_index] = s;
this->d_index++;
}
}
return this->buffer;
}
void all_pass_set_time(all_pass *this,double delay_time_milli)
{
this->delay_time_milli = delay_time_milli;
this->delay_size = delay_time_milli * SAMPLE_RATE / 1000;
if(this->delay_size > this->biggest_size)
{
this->delay_buffer = realloc(this->delay_buffer,sizeof(sample) *
this->delay_size);
memset(this->delay_buffer + this->biggest_size,
0,sizeof(sample) * (this->delay_size - this->biggest_size));
this->biggest_size = this->delay_size;
}
}
void all_pass_set_feedback(all_pass *this,int feedback)
{
this->feedback = feedback;
}
static sample_producer **get_children(all_pass *this)
{
return &(this->input);
}
static char **get_header(all_pass *this)
{
static char *header[] = {
"int $n_i = ((all_pass *)$t)->d_index;",
"int $n_size = ((all_pass *)$t)->delay_size;",
"int $n_feedback = ((all_pass *)$t)->feedback;",
"sample *$n_buf = ((all_pass *)$t)->delay_buffer;",
NULL
};
return header;
}
static char **get_code(all_pass *this)
{
static char *code[] = {
"if ($n_i >= $n_size)",
" $n_i = 0;",
/*"$o = (long)$n_buf[$n_i] *",
" (MAX_FEEDBACK * MAX_FEEDBACK - $n_feedback * $n_feedback) /",
" (MAX_FEEDBACK * MAX_FEEDBACK) +",
" ($i0 * -$n_feedback / MAX_FEEDBACK);",
*/
"$o = (long)$n_buf[$n_i] +",
" ($i0 * -$n_feedback / MAX_FEEDBACK);",
"$n_buf[$n_i] = $i0 + (long)$n_buf[$n_i] * $n_feedback / MAX_FEEDBACK;",
"$n_i++;",
NULL
};
return code;
}
static char **get_footer(all_pass *this)
{
static char *footer[] = {
"((all_pass *)$t)->d_index = $n_i;",
NULL
};
return footer;
}
all_pass *all_pass_new(double delay_time_milli,int feedback,
sample_producer *input)
{
all_pass *out = (all_pass *)malloc(sizeof(all_pass));
out->get_buffer = all_pass_get_buffer;
out->next_buffer = all_pass_next_buffer;
out->get_children = get_children;
out->get_header = get_header;
out->get_code = get_code;
out->get_footer = get_footer;
out->next = 0;
out->input = input;
out->unused = NULL;
out->feedback = feedback;
out->delay_time_milli = delay_time_milli;
out->delay_size = delay_time_milli * SAMPLE_RATE / 1000;
out->delay_buffer = (sample *)malloc(sizeof(sample)*out->delay_size);
memset(out->delay_buffer,0,sizeof(sample)*out->delay_size);
out->buffer = (sample *)malloc(sizeof(sample) * TBASS_BUFF_SIZE);
memset(out->buffer,0,sizeof(sample) * TBASS_BUFF_SIZE);
out->d_index = 0;
out->biggest_size = out->delay_size;
return out;
}
/*
Local Variables:
mode: font-lock
End:
*/
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