src/synth.cpp

   1 /* Calf DSP Library
   2  * Generic polyphonic synthesizer framework.
   3  *
   4  * Copyright (C) 2007 Krzysztof Foltman
   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., 59 Temple Place, Suite 330,
  19  * Boston, MA 02111-1307, USA.
  20  */
  21 #include <config.h>
  22 #include <assert.h>
  23 #include <memory.h>
  24 #if USE_JACK
  25 #include <jack/jack.h>
  26 #endif
  27 #include <calf/giface.h>
  28 #include <calf/synth.h>
  29
  30 using namespace dsp;
  31 using namespace std;
  32
  33 void basic_synth::kill_note(int note, int vel, bool just_one)
  34 {
  35     for (list<dsp::voice *>::iterator it = active_voices.begin(); it != active_voices.end(); it++) {
  36         // preserve sostenuto notes
  37         if ((*it)->get_current_note() == note && !(sostenuto && (*it)->sostenuto)) {
  38             (*it)->note_off(vel);
  39             if (just_one)
  40                 return;
  41         }
  42     }
  43 }
  44
  45 dsp::voice *basic_synth::give_voice()
  46 {
  47     if (active_voices.size() >= polyphony_limit)
  48     {
  49         dsp::voice *stolen = steal_voice();
  50         if (stolen)
  51             return stolen;
  52     }
  53     if (unused_voices.empty())
  54         return alloc_voice();
  55     else {
  56         dsp::voice *v = unused_voices.top();
  57         unused_voices.pop();
  58         v->reset();
  59         return v;
  60     }
  61 }
  62
  63 dsp::voice *basic_synth::steal_voice()
  64 {
  65     std::list<dsp::voice *>::iterator found = active_voices.end();
  66     float priority = 10000;
  67     for(std::list<dsp::voice *>::iterator i = active_voices.begin(); i != active_voices.end(); i++)
  68     {
  69         if ((*i)->get_priority() < priority)
  70         {
  71             priority = (*i)->get_priority();
  72             found = i;
  73         }
  74     }
  75     if (found == active_voices.end())
  76         return NULL;
  77
  78     (*found)->steal();
  79     return NULL;
  80 }
  81
  82 void basic_synth::trim_voices()
  83 {
  84     // count stealable voices
  85     unsigned int count = 0;
  86     for(std::list<dsp::voice *>::iterator i = active_voices.begin(); i != active_voices.end(); i++)
  87     {
  88         if ((*i)->get_priority() < 10000)
  89             count++;
  90     }
  91     // printf("Count=%d limit=%d\n", count, polyphony_limit);
  92     // steal any voices above polyphony limit
  93     if (count > polyphony_limit) {
  94         for (unsigned int i = 0; i < count - polyphony_limit; i++)
  95             steal_voice();
  96     }
  97 }
  98
  99 void basic_synth::note_on(int note, int vel)
 100 {
 101     if (!vel) {
 102         note_off(note, 0);
 103         return;
 104     }
 105     bool perc = check_percussion();
 106     dsp::voice *v = give_voice();
 107     v->setup(sample_rate);
 108     v->released = false;
 109     v->sostenuto = false;
 110     gate.set(note);
 111     v->note_on(note, vel);
 112     active_voices.push_back(v);
 113     if (perc) {
 114         percussion_note_on(note, vel);
 115     }
 116 }
 117
 118 void basic_synth::note_off(int note, int vel)
 119 {
 120     gate.reset(note);
 121     if (!hold)
 122         kill_note(note, vel, false);
 123 }
 124
 125 #define for_all_voices(iter) for (std::list<dsp::voice *>::iterator iter = active_voices.begin(); iter != active_voices.end(); iter++)
 126
 127 void basic_synth::on_pedal_release()
 128 {
 129     for_all_voices(i)
 130     {
 131         int note = (*i)->get_current_note();
 132         if (note < 0 || note > 127)
 133             continue;
 134         bool still_held = gate[note];
 135         // sostenuto pedal released
 136         if ((*i)->sostenuto && !sostenuto)
 137         {
 138             // mark note as non-sostenuto
 139             (*i)->sostenuto = false;
 140             // if key still pressed or hold pedal used, hold the note (as non-sostenuto so it can be released later by releasing the key or pedal)
 141             // if key has been released and hold pedal is not depressed, release the note
 142             if (!still_held && !hold)
 143                 (*i)->note_off(127);
 144         }
 145         else if (!hold && !still_held && !(*i)->released)
 146         {
 147             (*i)->released = true;
 148             (*i)->note_off(127);
 149         }
 150     }
 151 }
 152
 153 void basic_synth::control_change(int ctl, int val)
 154 {
 155     if (ctl == 64) { // HOLD controller
 156         bool prev = hold;
 157         hold = (val >= 64);
 158         if (!hold && prev && !sostenuto) {
 159             on_pedal_release();
 160         }
 161     }
 162     if (ctl == 66) { // SOSTENUTO controller
 163         bool prev = sostenuto;
 164         sostenuto = (val >= 64);
 165         if (sostenuto && !prev) {
 166             // SOSTENUTO was pressed - move all notes onto sustain stack
 167             for_all_voices(i) {
 168                 (*i)->sostenuto = true;
 169             }
 170         }
 171         if (!sostenuto && prev) {
 172             // SOSTENUTO was released - release all keys which were previously held
 173             on_pedal_release();
 174         }
 175     }
 176     if (ctl == 123 || ctl == 120) { // all notes off, all sounds off
 177         vector<int> notes;
 178         notes.reserve(128);
 179         if (ctl == 120) { // for "all sounds off", automatically release hold and sostenuto pedal
 180             control_change(66, 0);
 181             control_change(64, 0);
 182         }
 183         for_all_voices(i)
 184         {
 185             (*i)->note_off(127);
 186         }
 187     }
 188     if (ctl == 121) {
 189         control_change(1, 0);
 190         control_change(7, 100);
 191         control_change(10, 64);
 192         control_change(11, 127);
 193         // release hold..hold2
 194         for (int i = 64; i <= 69; i++)
 195             control_change(i, 0);
 196     }
 197 }
 198
 199 void basic_synth::render_to(float (*output)[2], int nsamples)
 200 {
 201     // render voices, eliminate ones that aren't sounding anymore
 202     for (list<dsp::voice *>::iterator i = active_voices.begin(); i != active_voices.end();) {
 203         dsp::voice *v = *i;
 204         v->render_to(output, nsamples);
 205         if (!v->get_active()) {
 206             i = active_voices.erase(i);
 207             unused_voices.push(v);
 208             continue;
 209         }
 210         i++;
 211     }
 212 }
 213
 214 basic_synth::~basic_synth()
 215 {
 216     while(!unused_voices.empty()) {
 217         delete unused_voices.top();
 218         unused_voices.pop();
 219     }
 220     for (list<voice *>::iterator i = active_voices.begin(); i != active_voices.end(); i++)
 221         delete *i;
 222 }
 223