juce/source/extras/JuceDemo/Source/demos/AudioDemoSynthPage.cpp

   1 /*
   2   ==============================================================================
   3
   4   This is an automatically generated file created by the Jucer!
   5
   6   Creation date:  1 May 2011 12:06:00pm
   7
   8   Be careful when adding custom code to these files, as only the code within
   9   the "//[xyz]" and "//[/xyz]" sections will be retained when the file is loaded
  10   and re-saved.
  11
  12   Jucer version: 1.12
  13
  14   ------------------------------------------------------------------------------
  15
  16   The Jucer is part of the JUCE library - "Jules' Utility Class Extensions"
  17   Copyright 2004-6 by Raw Material Software ltd.
  18
  19   ==============================================================================
  20 */
  21
  22 //[Headers] You can add your own extra header files here...
  23 //[/Headers]
  24
  25 #include "AudioDemoSynthPage.h"
  26
  27
  28 //[MiscUserDefs] You can add your own user definitions and misc code here...
  29
  30 //==============================================================================
  31 /** Our demo synth sound is just a basic sine wave..
  32 */
  33 class SineWaveSound : public SynthesiserSound
  34 {
  35 public:
  36     SineWaveSound()
  37     {
  38     }
  39
  40     bool appliesToNote (const int /*midiNoteNumber*/)           { return true; }
  41     bool appliesToChannel (const int /*midiChannel*/)           { return true; }
  42 };
  43
  44
  45 //==============================================================================
  46 /** Our demo synth voice just plays a sine wave..
  47 */
  48 class SineWaveVoice  : public SynthesiserVoice
  49 {
  50 public:
  51     SineWaveVoice()
  52         : angleDelta (0.0),
  53           tailOff (0.0)
  54     {
  55     }
  56
  57     bool canPlaySound (SynthesiserSound* sound)
  58     {
  59         return dynamic_cast <SineWaveSound*> (sound) != 0;
  60     }
  61
  62     void startNote (const int midiNoteNumber, const float velocity,
  63                     SynthesiserSound* /*sound*/, const int /*currentPitchWheelPosition*/)
  64     {
  65         currentAngle = 0.0;
  66         level = velocity * 0.15;
  67         tailOff = 0.0;
  68
  69         double cyclesPerSecond = MidiMessage::getMidiNoteInHertz (midiNoteNumber);
  70         double cyclesPerSample = cyclesPerSecond / getSampleRate();
  71
  72         angleDelta = cyclesPerSample * 2.0 * double_Pi;
  73     }
  74
  75     void stopNote (const bool allowTailOff)
  76     {
  77         if (allowTailOff)
  78         {
  79             // start a tail-off by setting this flag. The render callback will pick up on
  80             // this and do a fade out, calling clearCurrentNote() when it's finished.
  81
  82             if (tailOff == 0.0) // we only need to begin a tail-off if it's not already doing so - the
  83                                 // stopNote method could be called more than once.
  84                 tailOff = 1.0;
  85         }
  86         else
  87         {
  88             // we're being told to stop playing immediately, so reset everything..
  89
  90             clearCurrentNote();
  91             angleDelta = 0.0;
  92         }
  93     }
  94
  95     void pitchWheelMoved (const int /*newValue*/)
  96     {
  97         // can't be bothered implementing this for the demo!
  98     }
  99
 100     void controllerMoved (const int /*controllerNumber*/, const int /*newValue*/)
 101     {
 102         // not interested in controllers in this case.
 103     }
 104
 105     void renderNextBlock (AudioSampleBuffer& outputBuffer, int startSample, int numSamples)
 106     {
 107         if (angleDelta != 0.0)
 108         {
 109             if (tailOff > 0)
 110             {
 111                 while (--numSamples >= 0)
 112                 {
 113                     const float currentSample = (float) (sin (currentAngle) * level * tailOff);
 114
 115                     for (int i = outputBuffer.getNumChannels(); --i >= 0;)
 116                         *outputBuffer.getSampleData (i, startSample) += currentSample;
 117
 118                     currentAngle += angleDelta;
 119                     ++startSample;
 120
 121                     tailOff *= 0.99;
 122
 123                     if (tailOff <= 0.005)
 124                     {
 125                         clearCurrentNote();
 126
 127                         angleDelta = 0.0;
 128                         break;
 129                     }
 130                 }
 131             }
 132             else
 133             {
 134                 while (--numSamples >= 0)
 135                 {
 136                     const float currentSample = (float) (sin (currentAngle) * level);
 137
 138                     for (int i = outputBuffer.getNumChannels(); --i >= 0;)
 139                         *outputBuffer.getSampleData (i, startSample) += currentSample;
 140
 141                     currentAngle += angleDelta;
 142                     ++startSample;
 143                 }
 144             }
 145         }
 146     }
 147
 148 private:
 149     double currentAngle, angleDelta, level, tailOff;
 150 };
 151
 152
 153 // This is an audio source that streams the output of our demo synth.
 154 class SynthAudioSource  : public AudioSource
 155 {
 156 public:
 157     //==============================================================================
 158     // this collects real-time midi messages from the midi input device, and
 159     // turns them into blocks that we can process in our audio callback
 160     MidiMessageCollector midiCollector;
 161
 162     // this represents the state of which keys on our on-screen keyboard are held
 163     // down. When the mouse is clicked on the keyboard component, this object also
 164     // generates midi messages for this, which we can pass on to our synth.
 165     MidiKeyboardState& keyboardState;
 166
 167     // the synth itself!
 168     Synthesiser synth;
 169
 170     //==============================================================================
 171     SynthAudioSource (MidiKeyboardState& keyboardState_)
 172         : keyboardState (keyboardState_)
 173     {
 174         // add some voices to our synth, to play the sounds..
 175         for (int i = 4; --i >= 0;)
 176         {
 177             synth.addVoice (new SineWaveVoice());   // These voices will play our custom sine-wave sounds..
 178             synth.addVoice (new SamplerVoice());    // and these ones play the sampled sounds
 179         }
 180
 181         // and add some sounds for them to play...
 182         setUsingSineWaveSound();
 183     }
 184
 185     void setUsingSineWaveSound()
 186     {
 187         synth.clearSounds();
 188         synth.addSound (new SineWaveSound());
 189     }
 190
 191     void setUsingSampledSound()
 192     {
 193         synth.clearSounds();
 194
 195         WavAudioFormat wavFormat;
 196
 197         ScopedPointer<AudioFormatReader> audioReader (wavFormat.createReaderFor (new MemoryInputStream (BinaryData::cello_wav,
 198                                                                                                         BinaryData::cello_wavSize,
 199                                                                                                         false),
 200                                                                                  true));
 201
 202         BigInteger allNotes;
 203         allNotes.setRange (0, 128, true);
 204
 205         synth.addSound (new SamplerSound ("demo sound",
 206                                           *audioReader,
 207                                           allNotes,
 208                                           74,   // root midi note
 209                                           0.1,  // attack time
 210                                           0.1,  // release time
 211                                           10.0  // maximum sample length
 212                                           ));
 213     }
 214
 215     void prepareToPlay (int /*samplesPerBlockExpected*/, double sampleRate)
 216     {
 217         midiCollector.reset (sampleRate);
 218
 219         synth.setCurrentPlaybackSampleRate (sampleRate);
 220     }
 221
 222     void releaseResources()
 223     {
 224     }
 225
 226     void getNextAudioBlock (const AudioSourceChannelInfo& bufferToFill)
 227     {
 228         // the synth always adds its output to the audio buffer, so we have to clear it
 229         // first..
 230         bufferToFill.clearActiveBufferRegion();
 231
 232         // fill a midi buffer with incoming messages from the midi input.
 233         MidiBuffer incomingMidi;
 234         midiCollector.removeNextBlockOfMessages (incomingMidi, bufferToFill.numSamples);
 235
 236         // pass these messages to the keyboard state so that it can update the component
 237         // to show on-screen which keys are being pressed on the physical midi keyboard.
 238         // This call will also add midi messages to the buffer which were generated by
 239         // the mouse-clicking on the on-screen keyboard.
 240         keyboardState.processNextMidiBuffer (incomingMidi, 0, bufferToFill.numSamples, true);
 241
 242         // and now get the synth to process the midi events and generate its output.
 243         synth.renderNextBlock (*bufferToFill.buffer, incomingMidi, 0, bufferToFill.numSamples);
 244     }
 245 };
 246
 247 //[/MiscUserDefs]
 248
 249 //==============================================================================
 250 AudioDemoSynthPage::AudioDemoSynthPage (AudioDeviceManager& deviceManager_)
 251     : deviceManager (deviceManager_),
 252       keyboardComponent (0),
 253       sineButton (0),
 254       sampledButton (0),
 255       liveAudioDisplayComp (0)
 256 {
 257     addAndMakeVisible (keyboardComponent = new MidiKeyboardComponent (keyboardState, MidiKeyboardComponent::horizontalKeyboard));
 258
 259     addAndMakeVisible (sineButton = new ToggleButton (String::empty));
 260     sineButton->setButtonText (L"Use sine wave");
 261     sineButton->setRadioGroupId (321);
 262     sineButton->addListener (this);
 263     sineButton->setToggleState (true, false);
 264
 265     addAndMakeVisible (sampledButton = new ToggleButton (String::empty));
 266     sampledButton->setButtonText (L"Use sampled sound");
 267     sampledButton->setRadioGroupId (321);
 268     sampledButton->addListener (this);
 269
 270     addAndMakeVisible (liveAudioDisplayComp = new LiveAudioInputDisplayComp());
 271
 272
 273     //[UserPreSize]
 274     //[/UserPreSize]
 275
 276     setSize (600, 400);
 277
 278
 279     //[Constructor] You can add your own custom stuff here..
 280     deviceManager.addAudioCallback (liveAudioDisplayComp);
 281
 282     synthAudioSource = new SynthAudioSource (keyboardState);
 283     audioSourcePlayer.setSource (synthAudioSource);
 284
 285     deviceManager.addAudioCallback (&audioSourcePlayer);
 286     deviceManager.addMidiInputCallback (String::empty, &(synthAudioSource->midiCollector));
 287     //[/Constructor]
 288 }
 289
 290 AudioDemoSynthPage::~AudioDemoSynthPage()
 291 {
 292     //[Destructor_pre]. You can add your own custom destruction code here..
 293     audioSourcePlayer.setSource (0);
 294     deviceManager.removeMidiInputCallback (String::empty, &(synthAudioSource->midiCollector));
 295     deviceManager.removeAudioCallback (&audioSourcePlayer);
 296     deviceManager.removeAudioCallback (liveAudioDisplayComp);
 297     //[/Destructor_pre]
 298
 299     deleteAndZero (keyboardComponent);
 300     deleteAndZero (sineButton);
 301     deleteAndZero (sampledButton);
 302     deleteAndZero (liveAudioDisplayComp);
 303
 304
 305     //[Destructor]. You can add your own custom destruction code here..
 306     //[/Destructor]
 307 }
 308
 309 //==============================================================================
 310 void AudioDemoSynthPage::paint (Graphics& g)
 311 {
 312     //[UserPrePaint] Add your own custom painting code here..
 313     //[/UserPrePaint]
 314
 315     g.fillAll (Colours::lightgrey);
 316
 317     //[UserPaint] Add your own custom painting code here..
 318     //[/UserPaint]
 319 }
 320
 321 void AudioDemoSynthPage::resized()
 322 {
 323     keyboardComponent->setBounds (8, 96, getWidth() - 16, 64);
 324     sineButton->setBounds (16, 176, 150, 24);
 325     sampledButton->setBounds (16, 200, 150, 24);
 326     liveAudioDisplayComp->setBounds (8, 8, getWidth() - 16, 64);
 327     //[UserResized] Add your own custom resize handling here..
 328     //[/UserResized]
 329 }
 330
 331 void AudioDemoSynthPage::buttonClicked (Button* buttonThatWasClicked)
 332 {
 333     //[UserbuttonClicked_Pre]
 334     //[/UserbuttonClicked_Pre]
 335
 336     if (buttonThatWasClicked == sineButton)
 337     {
 338         //[UserButtonCode_sineButton] -- add your button handler code here..
 339         synthAudioSource->setUsingSineWaveSound();
 340         //[/UserButtonCode_sineButton]
 341     }
 342     else if (buttonThatWasClicked == sampledButton)
 343     {
 344         //[UserButtonCode_sampledButton] -- add your button handler code here..
 345         synthAudioSource->setUsingSampledSound();
 346         //[/UserButtonCode_sampledButton]
 347     }
 348
 349     //[UserbuttonClicked_Post]
 350     //[/UserbuttonClicked_Post]
 351 }
 352
 353
 354
 355 //[MiscUserCode] You can add your own definitions of your custom methods or any other code here...
 356 //[/MiscUserCode]
 357
 358
 359 //==============================================================================
 360 #if 0
 361 /*  -- Jucer information section --
 362
 363     This is where the Jucer puts all of its metadata, so don't change anything in here!
 364
 365 BEGIN_JUCER_METADATA
 366
 367 <JUCER_COMPONENT documentType="Component" className="AudioDemoSynthPage" componentName=""
 368                  parentClasses="public Component" constructorParams="AudioDeviceManager&amp; deviceManager_"
 369                  variableInitialisers="deviceManager (deviceManager_)" snapPixels="8"
 370                  snapActive="1" snapShown="1" overlayOpacity="0.330000013" fixedSize="0"
 371                  initialWidth="600" initialHeight="400">
 372   <BACKGROUND backgroundColour="ffd3d3d3"/>
 373   <GENERICCOMPONENT name="" id="86605ec4f02c4320" memberName="keyboardComponent"
 374                     virtualName="" explicitFocusOrder="0" pos="8 96 16M 64" class="MidiKeyboardComponent"
 375                     params="keyboardState, MidiKeyboardComponent::horizontalKeyboard"/>
 376   <TOGGLEBUTTON name="" id="d75101df45006ba9" memberName="sineButton" virtualName=""
 377                 explicitFocusOrder="0" pos="16 176 150 24" buttonText="Use sine wave"
 378                 connectedEdges="0" needsCallback="1" radioGroupId="321" state="1"/>
 379   <TOGGLEBUTTON name="" id="2d687b4ac3dad628" memberName="sampledButton" virtualName=""
 380                 explicitFocusOrder="0" pos="16 200 150 24" buttonText="Use sampled sound"
 381                 connectedEdges="0" needsCallback="1" radioGroupId="321" state="0"/>
 382   <GENERICCOMPONENT name="" id="7d70eb2617f56220" memberName="liveAudioDisplayComp"
 383                     virtualName="" explicitFocusOrder="0" pos="8 8 16M 64" class="LiveAudioInputDisplayComp"
 384                     params=""/>
 385 </JUCER_COMPONENT>
 386
 387 END_JUCER_METADATA
 388 */
 389 #endif