File: delay.c

package info (click to toggle)
freebirth 0.3.2-9.2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid, stretch
  • size: 3,632 kB
  • ctags: 640
  • sloc: ansic: 4,724; makefile: 89; sh: 1
file content (157 lines) | stat: -rw-r--r-- 3,968 bytes parent folder | download | duplicates (4)
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
/* 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 "delay.h"
#include <stdlib.h>
#include <string.h>

#define SAMPLE_RATE 44100

void delay_next_buffer(delay *this)
{
  this->next = 1;
}

sample *delay_get_buffer(delay *this)
{
  int i;
  
  sample *i_buf;

  if (this->delay_size == 0)/*pass the signal through */
    return this->input->get_buffer(this->input);

  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] = this->delay_buffer[this->d_index];
	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 delay_set_time(delay *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 delay_set_feedback(delay *this,int feedback)
{
  this->feedback = feedback;
}



static sample_producer **get_children(delay *this)
{
  return &(this->input);
}

static char **get_header(delay *this)
{
  static char *header[] = {
    "int $n_i = ((delay *)$t)->d_index;",
    "int $n_size = ((delay *)$t)->delay_size;",
    "int $n_feedback = ((delay *)$t)->feedback;",
    "sample *$n_buf = ((delay *)$t)->delay_buffer;",
    NULL
  };
  return header;
}

static char **get_code(delay *this)
{
  static char *code[] = {
    "if ($n_i >= $n_size)",
    "  $n_i = 0;",
    "$o = $n_buf[$n_i];",
    "$n_buf[$n_i] = $i0 + $n_buf[$n_i] * $n_feedback / MAX_FEEDBACK;",
    "$n_i++;",
    NULL
  };
  return code;
}

static char **get_footer(delay *this)
{
  static char *footer[] = {
    "((delay *)$t)->d_index = $n_i;",
    NULL
  };
  return footer;
}

delay *delay_new(double delay_time_milli,int feedback, sample_producer *input)
{
  delay *out = (delay *)malloc(sizeof(delay));
  
  out->get_buffer       = delay_get_buffer;
  out->next_buffer      = delay_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:
*/