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

   1 /*
   2   ==============================================================================
   3
   4   This is an automatically generated file created by the Jucer!
   5
   6   Creation date:  1 May 2011 12:08:25pm
   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 "AudioDemoRecordPage.h"
  26
  27
  28 //[MiscUserDefs] You can add your own user definitions and misc code here...
  29
  30
  31 //==============================================================================
  32 /** A simple class that acts as an AudioIODeviceCallback and writes the
  33     incoming audio data to a WAV file.
  34 */
  35 class AudioRecorder  : public AudioIODeviceCallback
  36 {
  37 public:
  38     AudioRecorder()
  39         : backgroundThread ("Audio Recorder Thread"),
  40           sampleRate (0), activeWriter (0)
  41     {
  42         backgroundThread.startThread();
  43     }
  44
  45     ~AudioRecorder()
  46     {
  47         stop();
  48     }
  49
  50     //==============================================================================
  51     void startRecording (const File& file)
  52     {
  53         stop();
  54
  55         if (sampleRate > 0)
  56         {
  57             // Create an OutputStream to write to our destination file...
  58             file.deleteFile();
  59             ScopedPointer<FileOutputStream> fileStream (file.createOutputStream());
  60
  61             if (fileStream != 0)
  62             {
  63                 // Now create a WAV writer object that writes to our output stream...
  64                 WavAudioFormat wavFormat;
  65                 AudioFormatWriter* writer = wavFormat.createWriterFor (fileStream, sampleRate, 1, 16, StringPairArray(), 0);
  66
  67                 if (writer != 0)
  68                 {
  69                     fileStream.release(); // (passes responsibility for deleting the stream to the writer object that is now using it)
  70
  71                     // Now we'll create one of these helper objects which will act as a FIFO buffer, and will
  72                     // write the data to disk on our background thread.
  73                     threadedWriter = new AudioFormatWriter::ThreadedWriter (writer, backgroundThread, 32768);
  74
  75                     // And now, swap over our active writer pointer so that the audio callback will start using it..
  76                     const ScopedLock sl (writerLock);
  77                     activeWriter = threadedWriter;
  78                 }
  79             }
  80         }
  81     }
  82
  83     void stop()
  84     {
  85         // First, clear this pointer to stop the audio callback from using our writer object..
  86         {
  87             const ScopedLock sl (writerLock);
  88             activeWriter = 0;
  89         }
  90
  91         // Now we can delete the writer object. It's done in this order because the deletion could
  92         // take a little time while remaining data gets flushed to disk, so it's best to avoid blocking
  93         // the audio callback while this happens.
  94         threadedWriter = 0;
  95     }
  96
  97     bool isRecording() const
  98     {
  99         return activeWriter != 0;
 100     }
 101
 102     //==============================================================================
 103     void audioDeviceAboutToStart (AudioIODevice* device)
 104     {
 105         sampleRate = device->getCurrentSampleRate();
 106     }
 107
 108     void audioDeviceStopped()
 109     {
 110         sampleRate = 0;
 111     }
 112
 113     void audioDeviceIOCallback (const float** inputChannelData, int /*numInputChannels*/,
 114                                 float** outputChannelData, int numOutputChannels,
 115                                 int numSamples)
 116     {
 117         const ScopedLock sl (writerLock);
 118
 119         if (activeWriter != 0)
 120             activeWriter->write (inputChannelData, numSamples);
 121
 122         // We need to clear the output buffers, in case they're full of junk..
 123         for (int i = 0; i < numOutputChannels; ++i)
 124             if (outputChannelData[i] != 0)
 125                 zeromem (outputChannelData[i], sizeof (float) * numSamples);
 126     }
 127
 128 private:
 129     TimeSliceThread backgroundThread; // the thread that will write our audio data to disk
 130     ScopedPointer<AudioFormatWriter::ThreadedWriter> threadedWriter; // the FIFO used to buffer the incoming data
 131     double sampleRate;
 132
 133     CriticalSection writerLock;
 134     AudioFormatWriter::ThreadedWriter* volatile activeWriter;
 135 };
 136
 137 //[/MiscUserDefs]
 138
 139 //==============================================================================
 140 AudioDemoRecordPage::AudioDemoRecordPage (AudioDeviceManager& deviceManager_)
 141     : deviceManager (deviceManager_),
 142       liveAudioDisplayComp (0),
 143       explanationLabel (0),
 144       recordButton (0)
 145 {
 146     addAndMakeVisible (liveAudioDisplayComp = new LiveAudioInputDisplayComp());
 147
 148     addAndMakeVisible (explanationLabel = new Label (String::empty,
 149                                                      L"This page demonstrates how to record a wave file from the live audio input..\n\nPressing record will start recording a file in your \"Documents\" folder."));
 150     explanationLabel->setFont (Font (15.0000f, Font::plain));
 151     explanationLabel->setJustificationType (Justification::topLeft);
 152     explanationLabel->setEditable (false, false, false);
 153     explanationLabel->setColour (TextEditor::textColourId, Colours::black);
 154     explanationLabel->setColour (TextEditor::backgroundColourId, Colour (0x0));
 155
 156     addAndMakeVisible (recordButton = new TextButton (String::empty));
 157     recordButton->setButtonText (L"Record");
 158     recordButton->addListener (this);
 159     recordButton->setColour (TextButton::buttonColourId, Colour (0xffff5c5c));
 160     recordButton->setColour (TextButton::textColourOnId, Colours::black);
 161
 162
 163     //[UserPreSize]
 164     //[/UserPreSize]
 165
 166     setSize (600, 400);
 167
 168
 169     //[Constructor] You can add your own custom stuff here..
 170     recorder = new AudioRecorder();
 171     deviceManager.addAudioCallback (recorder);
 172     deviceManager.addAudioCallback (liveAudioDisplayComp);
 173     //[/Constructor]
 174 }
 175
 176 AudioDemoRecordPage::~AudioDemoRecordPage()
 177 {
 178     //[Destructor_pre]. You can add your own custom destruction code here..
 179     deviceManager.removeAudioCallback (recorder);
 180     deviceManager.removeAudioCallback (liveAudioDisplayComp);
 181     recorder = 0;
 182     //[/Destructor_pre]
 183
 184     deleteAndZero (liveAudioDisplayComp);
 185     deleteAndZero (explanationLabel);
 186     deleteAndZero (recordButton);
 187
 188
 189     //[Destructor]. You can add your own custom destruction code here..
 190     //[/Destructor]
 191 }
 192
 193 //==============================================================================
 194 void AudioDemoRecordPage::paint (Graphics& g)
 195 {
 196     //[UserPrePaint] Add your own custom painting code here..
 197     //[/UserPrePaint]
 198
 199     g.fillAll (Colours::lightgrey);
 200
 201     //[UserPaint] Add your own custom painting code here..
 202     //[/UserPaint]
 203 }
 204
 205 void AudioDemoRecordPage::resized()
 206 {
 207     liveAudioDisplayComp->setBounds (8, 8, getWidth() - 16, 64);
 208     explanationLabel->setBounds (160, 88, getWidth() - 169, 216);
 209     recordButton->setBounds (8, 88, 136, 40);
 210     //[UserResized] Add your own custom resize handling here..
 211     //[/UserResized]
 212 }
 213
 214 void AudioDemoRecordPage::buttonClicked (Button* buttonThatWasClicked)
 215 {
 216     //[UserbuttonClicked_Pre]
 217     //[/UserbuttonClicked_Pre]
 218
 219     if (buttonThatWasClicked == recordButton)
 220     {
 221         //[UserButtonCode_recordButton] -- add your button handler code here..
 222         if (recorder->isRecording())
 223         {
 224             recorder->stop();
 225         }
 226         else
 227         {
 228             File file (File::getSpecialLocation (File::userDocumentsDirectory)
 229                        .getNonexistentChildFile ("Juce Demo Audio Recording", ".wav"));
 230
 231             recorder->startRecording (file);
 232         }
 233
 234         if (recorder->isRecording())
 235             recordButton->setButtonText ("Stop");
 236         else
 237             recordButton->setButtonText ("Record");
 238
 239         //[/UserButtonCode_recordButton]
 240     }
 241
 242     //[UserbuttonClicked_Post]
 243     //[/UserbuttonClicked_Post]
 244 }
 245
 246 void AudioDemoRecordPage::visibilityChanged()
 247 {
 248     //[UserCode_visibilityChanged] -- Add your code here...
 249     recorder->stop();
 250     recordButton->setButtonText ("Record");
 251     //[/UserCode_visibilityChanged]
 252 }
 253
 254
 255
 256 //[MiscUserCode] You can add your own definitions of your custom methods or any other code here...
 257 //[/MiscUserCode]
 258
 259
 260 //==============================================================================
 261 #if 0
 262 /*  -- Jucer information section --
 263
 264     This is where the Jucer puts all of its metadata, so don't change anything in here!
 265
 266 BEGIN_JUCER_METADATA
 267
 268 <JUCER_COMPONENT documentType="Component" className="AudioDemoRecordPage" componentName=""
 269                  parentClasses="public Component" constructorParams="AudioDeviceManager&amp; deviceManager_"
 270                  variableInitialisers="deviceManager (deviceManager_)" snapPixels="8"
 271                  snapActive="1" snapShown="1" overlayOpacity="0.330000013" fixedSize="0"
 272                  initialWidth="600" initialHeight="400">
 273   <METHODS>
 274     <METHOD name="visibilityChanged()"/>
 275   </METHODS>
 276   <BACKGROUND backgroundColour="ffd3d3d3"/>
 277   <GENERICCOMPONENT name="" id="7d70eb2617f56220" memberName="liveAudioDisplayComp"
 278                     virtualName="" explicitFocusOrder="0" pos="8 8 16M 64" class="LiveAudioInputDisplayComp"
 279                     params=""/>
 280   <LABEL name="" id="1162fb2599a768b4" memberName="explanationLabel" virtualName=""
 281          explicitFocusOrder="0" pos="160 88 169M 216" edTextCol="ff000000"
 282          edBkgCol="0" labelText="This page demonstrates how to record a wave file from the live audio input..&#10;&#10;Pressing record will start recording a file in your &quot;Documents&quot; folder."
 283          editableSingleClick="0" editableDoubleClick="0" focusDiscardsChanges="0"
 284          fontname="Default font" fontsize="15" bold="0" italic="0" justification="9"/>
 285   <TEXTBUTTON name="" id="2c10a0ba9fad39da" memberName="recordButton" virtualName=""
 286               explicitFocusOrder="0" pos="8 88 136 40" bgColOff="ffff5c5c"
 287               textCol="ff000000" buttonText="Record" connectedEdges="0" needsCallback="1"
 288               radioGroupId="0"/>
 289 </JUCER_COMPONENT>
 290
 291 END_JUCER_METADATA
 292 */
 293 #endif