src/calf/modules_delay.h

   1 /* Calf DSP plugin pack
   2  * Modulation effect plugins
   3  *
   4  * Copyright (C) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen and others
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General
  17  * Public License along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19  * Boston, MA  02110-1301  USA
  20  */
  21
  22 #ifndef CALF_MODULES_DELAY_H
  23 #define CALF_MODULES_DELAY_H
  24
  25 #include <assert.h>
  26 #include <limits.h>
  27 #include "biquad.h"
  28 #include "inertia.h"
  29 #include "audio_fx.h"
  30 #include "giface.h"
  31 #include "metadata.h"
  32 #include "loudness.h"
  33 #include <math.h>
  34 #include "plugin_tools.h"
  35
  36 namespace calf_plugins {
  37
  38 struct ladspa_plugin_info;
  39
  40 /**********************************************************************
  41  * REVERB by Krzysztof Foltman
  42 **********************************************************************/
  43
  44 class reverb_audio_module: public audio_module<reverb_metadata>
  45 {
  46     vumeters meters;
  47 public:
  48     dsp::reverb reverb;
  49     dsp::simple_delay<131072, dsp::stereo_sample<float> > pre_delay;
  50     dsp::onepole<float> left_lo, right_lo, left_hi, right_hi;
  51     uint32_t srate;
  52     dsp::gain_smoothing amount, dryamount;
  53     int predelay_amt;
  54     float meter_wet, meter_out;
  55     uint32_t clip;
  56
  57     void params_changed();
  58     uint32_t process(uint32_t offset, uint32_t numsamples, uint32_t inputs_mask, uint32_t outputs_mask);
  59     void activate();
  60     void set_sample_rate(uint32_t sr);
  61     void deactivate();
  62 };
  63
  64 /**********************************************************************
  65  * VINTAGE DELAY by Krzysztof Foltman
  66 **********************************************************************/
  67
  68 class vintage_delay_audio_module: public audio_module<vintage_delay_metadata>
  69 {
  70 public:
  71     // 1MB of delay memory per channel... uh, RAM is cheap
  72     enum { MAX_DELAY = 262144, ADDR_MASK = MAX_DELAY - 1 };
  73     enum { MIXMODE_STEREO, MIXMODE_PINGPONG, MIXMODE_LR, MIXMODE_RL };
  74     float buffers[2][MAX_DELAY];
  75     int bufptr, deltime_l, deltime_r, mixmode, medium, old_medium;
  76     /// number of table entries written (value is only important when it is less than MAX_DELAY, which means that the buffer hasn't been totally filled yet)
  77     int age;
  78
  79     dsp::gain_smoothing amt_left, amt_right, fb_left, fb_right, dry, chmix;
  80
  81     dsp::biquad_d2 biquad_left[2], biquad_right[2];
  82
  83     uint32_t srate;
  84
  85     vintage_delay_audio_module();
  86
  87     void params_changed();
  88     void activate();
  89     void deactivate();
  90     void set_sample_rate(uint32_t sr);
  91     void calc_filters();
  92     uint32_t process(uint32_t offset, uint32_t numsamples, uint32_t inputs_mask, uint32_t outputs_mask);
  93
  94     long _tap_avg;
  95     long _tap_last;
  96 };
  97
  98 /**********************************************************************
  99  * COMPENSATION DELAY LINE by Vladimir Sadovnikov
 100 **********************************************************************/
 101
 102 // The maximum distance for knobs
 103 #define COMP_DELAY_MAX_DISTANCE            (100.0 * 100.0 + 100.0 * 1.0 + 1.0)
 104 // The actual speed of sound in normal conditions
 105 #define COMP_DELAY_SOUND_SPEED_KM_H(temp)  1.85325 * (643.95 * std::pow(((temp + 273.15) / 273.15), 0.5))
 106 #define COMP_DELAY_SOUND_SPEED_CM_S(temp)  (COMP_DELAY_SOUND_SPEED_KM_H(temp) * (1000.0 * 100.0) /* cm/km */ / (60.0 * 60.0) /* s/h */)
 107 #define COMP_DELAY_SOUND_FRONT_DELAY(temp) (1.0 / COMP_DELAY_SOUND_SPEED_CM_S(temp))
 108 // The maximum delay may be reached by this plugin
 109 #define COMP_DELAY_MAX_DELAY               (COMP_DELAY_MAX_DISTANCE*COMP_DELAY_SOUND_FRONT_DELAY(50))
 110
 111 class comp_delay_audio_module: public audio_module<comp_delay_metadata>
 112 {
 113 public:
 114     float *buffer;
 115     uint32_t srate;
 116     uint32_t buf_size; // guaranteed to be power of 2
 117     uint32_t delay;
 118     uint32_t write_ptr;
 119
 120     comp_delay_audio_module();
 121     virtual ~comp_delay_audio_module();
 122
 123     void params_changed();
 124     void activate();
 125     void deactivate();
 126     void set_sample_rate(uint32_t sr);
 127     uint32_t process(uint32_t offset, uint32_t numsamples, uint32_t inputs_mask, uint32_t outputs_mask);
 128 };
 129
 130 };
 131 #endif