Fix various multi-bus issues and add support for consistent surround channel ordering

examples/PlugInSamples/Surround/Source/SurroundProcessor.cpp

@@ -0,0 +1,133 @@
+/*
+ ==============================================================================
+
+ This file is part of the JUCE library.
+ Copyright (c) 2015 - ROLI Ltd.
+
+ Permission is granted to use this software under the terms of either:
+ a) the GPL v2 (or any later version)
+ b) the Affero GPL v3
+
+ Details of these licenses can be found at: www.gnu.org/licenses
+
+ JUCE is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ ------------------------------------------------------------------------------
+
+ To release a closed-source product which uses JUCE, commercial licenses are
+ available: visit www.juce.com for more information.
+
+ ==============================================================================
+ */
+
+#include "../JuceLibraryCode/JuceHeader.h"
+#include "SurroundEditor.h"
+
+//==============================================================================
+/**
+ */
+class SurroundProcessor  : public AudioProcessor, public ChannelClickListener
+{
+public:
+
+    //==============================================================================
+    SurroundProcessor()
+    {
+    }
+
+    ~SurroundProcessor() {}
+
+    //==============================================================================
+    void prepareToPlay (double sampleRate, int samplesPerBlock) override
+    {
+        channelClicked = 0;
+        sampleOffset = static_cast<int> (std::ceil (sampleRate));
+
+        ignoreUnused (samplesPerBlock);
+    }
+
+    void releaseResources() override {}
+
+    void processBlock (AudioSampleBuffer& buffer, MidiBuffer&) override
+    {
+        buffer.clear();
+
+        const int fillSamples
+            = jmin (static_cast<int> (std::ceil (getSampleRate())) - sampleOffset, buffer.getNumSamples());
+
+        float* channelBuffer = buffer.getWritePointer (channelClicked);
+        const float freq = 440.f / static_cast<float> (getSampleRate());
+
+        for (int i = 0; i < fillSamples; ++i)
+            channelBuffer[i] = std::sin (2.0f * static_cast<float> (M_PI) * freq * static_cast<float> (sampleOffset++));
+    }
+
+    //==============================================================================
+    AudioProcessorEditor* createEditor() override { return new SurroundEditor (*this); }
+    bool hasEditor() const override               { return true;   }
+
+    //==============================================================================
+    bool setPreferredBusArrangement (bool isInputBus, int busIndex,
+                                     const AudioChannelSet& preferred) override
+    {
+        if  (   preferred == AudioChannelSet::mono()
+             || preferred == AudioChannelSet::stereo()
+             || preferred == AudioChannelSet::createLCR()
+             || preferred == AudioChannelSet::createLCRS()
+             || preferred == AudioChannelSet::quadraphonic()
+             || preferred == AudioChannelSet::pentagonal()
+             || preferred == AudioChannelSet::hexagonal()
+             || preferred == AudioChannelSet::octagonal()
+             || preferred == AudioChannelSet::ambisonic()
+             || preferred == AudioChannelSet::create5point0()
+             || preferred == AudioChannelSet::create5point1()
+             || preferred == AudioChannelSet::create6point0()
+             || preferred == AudioChannelSet::create6point1()
+             || preferred == AudioChannelSet::create7point0()
+             || preferred == AudioChannelSet::create7point1()
+             || preferred == AudioChannelSet::createFront7point0()
+             || preferred == AudioChannelSet::createFront7point1())
+            return AudioProcessor::setPreferredBusArrangement (isInputBus, busIndex, preferred);
+
+        return false;
+    }
+
+    //==============================================================================
+    const String getName() const override               { return "Surround PlugIn"; }
+    bool acceptsMidi() const override                   { return false; }
+    bool producesMidi() const override                  { return false; }
+    bool silenceInProducesSilenceOut() const override   { return true; }
+    double getTailLengthSeconds() const override        { return 0; }
+
+    //==============================================================================
+    int getNumPrograms() override                          { return 1; }
+    int getCurrentProgram() override                       { return 0; }
+    void setCurrentProgram (int) override                  {}
+    const String getProgramName (int) override             { return String(); }
+    void changeProgramName (int , const String& ) override { }
+
+    //==============================================================================
+    void getStateInformation (MemoryBlock&) override {}
+    void setStateInformation (const void* , int) override {}
+
+    void channelButtonClicked (int channelIndex) override
+    {
+        channelClicked = channelIndex;
+        sampleOffset = 0;
+    }
+
+private:
+    int channelClicked;
+    int sampleOffset;
+    //==============================================================================
+    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SurroundProcessor)
+};
+
+//==============================================================================
+// This creates new instances of the plugin..
+AudioProcessor* JUCE_CALLTYPE createPluginFilter()
+{
+    return new SurroundProcessor();
+}