Added AudioAppExample file in examples

Examples/AudioAppExample/Source/Main.cpp

@@ -0,0 +1,101 @@
+/*
+  ==============================================================================
+
+    This file was auto-generated by the Introjucer!
+
+    It contains the basic startup code for a Juce application.
+
+  ==============================================================================
+*/
+
+#include "../JuceLibraryCode/JuceHeader.h"
+
+Component* createMainContentComponent();
+
+//==============================================================================
+class AudioAppExampleApplication  : public JUCEApplication
+{
+public:
+    //==============================================================================
+    AudioAppExampleApplication() {}
+
+    const String getApplicationName() override       { return ProjectInfo::projectName; }
+    const String getApplicationVersion() override    { return ProjectInfo::versionString; }
+    bool moreThanOneInstanceAllowed() override       { return true; }
+
+    //==============================================================================
+    void initialise (const String& commandLine) override
+    {
+        // This method is where you should put your application's initialisation code..
+
+        mainWindow = new MainWindow (getApplicationName());
+    }
+
+    void shutdown() override
+    {
+        // Add your application's shutdown code here..
+
+        mainWindow = nullptr; // (deletes our window)
+    }
+
+    //==============================================================================
+    void systemRequestedQuit() override
+    {
+        // This is called when the app is being asked to quit: you can ignore this
+        // request and let the app carry on running, or call quit() to allow the app to close.
+        quit();
+    }
+
+    void anotherInstanceStarted (const String& commandLine) override
+    {
+        // When another instance of the app is launched while this one is running,
+        // this method is invoked, and the commandLine parameter tells you what
+        // the other instance's command-line arguments were.
+    }
+
+    //==============================================================================
+    /*
+        This class implements the desktop window that contains an instance of
+        our MainContentComponent class.
+    */
+    class MainWindow    : public DocumentWindow
+    {
+    public:
+        MainWindow (String name)  : DocumentWindow (name,
+                                                    Colours::lightgrey,
+                                                    DocumentWindow::allButtons)
+        {
+            setUsingNativeTitleBar (true);
+            setContentOwned (createMainContentComponent(), true);
+            setResizable (true, true);
+
+            centreWithSize (getWidth(), getHeight());
+            setVisible (true);
+        }
+
+        void closeButtonPressed() override
+        {
+            // This is called when the user tries to close this window. Here, we'll just
+            // ask the app to quit when this happens, but you can change this to do
+            // whatever you need.
+            JUCEApplication::getInstance()->systemRequestedQuit();
+        }
+
+        /* Note: Be careful if you override any DocumentWindow methods - the base
+           class uses a lot of them, so by overriding you might break its functionality.
+           It's best to do all your work in your content component instead, but if
+           you really have to override any DocumentWindow methods, make sure your
+           subclass also calls the superclass's method.
+        */
+
+    private:
+        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MainWindow)
+    };
+
+private:
+    ScopedPointer<MainWindow> mainWindow;
+};
+
+//==============================================================================
+// This macro generates the main() routine that launches the app.
+START_JUCE_APPLICATION (AudioAppExampleApplication)

Examples/AudioAppExample/Source/MainComponent.cpp

@@ -0,0 +1,159 @@
+/*
+  ==============================================================================
+
+    This file was auto-generated!
+
+  ==============================================================================
+*/
+
+#ifndef MAINCOMPONENT_H_INCLUDED
+#define MAINCOMPONENT_H_INCLUDED
+
+#include "../JuceLibraryCode/JuceHeader.h"
+
+//==============================================================================
+/*
+    This component lives inside our window, and this is where you should put all
+    your controls and content.
+*/
+class MainContentComponent   : public AudioAppComponent
+{
+public:
+    //==============================================================================
+
+
+    MainContentComponent()   : phase (0.0f),
+                            delta (0.0f),
+                            frequency (5000.0f),
+                            amplitude (0.2f),
+                            sampleRate (0.0)
+    
+    {
+        setSize (500, 400);
+        // the the input and output channels (currently Mono in and out)
+        setAudioChannels (1, 1);
+    }
+
+    ~MainContentComponent()
+    {
+        shutdownAudio();
+    }
+    
+    //=======================================================================
+    // HANDLE AUDIO
+    
+    void prepareToPlay (int samplesPerBlockExpected, double newSampleRate) override
+    {
+        sampleRate = newSampleRate;
+    }
+    
+    
+    /* This is where the audio is created. In this example we 
+     fill the audio buffer with a sine wave whose frequency is
+     controlled by the mouse Y position and whose volume is 
+     controlled by the mouse X potition.
+     */
+    void getNextAudioBlock (const AudioSourceChannelInfo& bufferToFill)
+    {
+        bufferToFill.clearActiveBufferRegion();
+        
+        // iterate over each sample of the sample buffer
+        for (int i = bufferToFill.startSample; i < bufferToFill.numSamples + bufferToFill.startSample; ++i)
+        {
+            bufferToFill.buffer->getWritePointer (0)[i] = amplitude * sinf (phase);
+            
+            // increment the phase step for the next sample
+            phase += delta;
+            
+            // reset the phase when it reaches 2PI to avoid large numbers
+            while (phase >= 2.0f * float_Pi) phase -= 2.0f * float_Pi;
+        }
+    }
+    
+    void releaseResources() override
+    {
+        // This gets automatically called when audio device paramters change
+        // or device is restarted.
+    }
+    
+    
+    //=======================================================================
+    // HANDLE DRAWING
+    
+    void paint (Graphics& g)
+    {
+        // fill background
+        g.fillAll (Colours::black);
+        
+        // Set the drawing colour to white
+        g.setColour (Colours::white);
+        
+        // Draw an ellipse based on the mouse position and audio volume
+        int radius = amplitude * 200;
+        g.fillEllipse  (mouse.x - radius/2, mouse.y - radius/2, radius, radius);
+        
+        // draw a representative sinewave
+        Path wave;
+        for (int i = 0; i < getWidth(); i++)
+        {
+            if (i == 0) wave.startNewSubPath (0, getHeight()/2);
+            else wave.lineTo (i, getHeight()/2 + amplitude * getHeight() * 2.0f * sin (i*frequency*0.0001f));
+        }
+        g.strokePath (wave, PathStrokeType (2));
+
+    }
+    
+    // Mouse handling
+    void mouseUp(const MouseEvent& e) override
+    {
+        amplitude = 0.0f;
+    }
+    
+    void mouseDown (const MouseEvent& e) override
+    {
+        mouseDrag (e);
+    }
+
+    void mouseDrag (const MouseEvent& e) override
+    {
+        // Update the mouse position variable
+        mouse.setXY (e.x, e.y);
+        repaint();
+        
+        frequency = (getHeight() - e.y) * 10.0f;
+        amplitude = e.x/float(getWidth()) * 0.2f;
+        
+        delta = 2.0f * float_Pi * frequency / sampleRate;
+    }
+    
+    
+    void resized()
+    {
+        // This is called when the MainContentComponent is resized.
+        // If you add any child components, this is where you should
+        // update their positions.
+    }
+
+
+private:
+    //==============================================================================
+    
+    // private member variables
+    
+    float phase;
+    float delta;
+    float frequency;
+    float amplitude;
+    
+    double sampleRate;
+                        
+    Point<int> mouse;
+    
+    
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MainContentComponent)
+};
+
+
+Component* createMainContentComponent() { return new MainContentComponent(); };
+
+#endif  // MAINCOMPONENT_H_INCLUDED