Initial stubs and basic Engine implementation

lib/BooBackend.cpp

@@ -0,0 +1,49 @@
+#include "amuse/BooBackend.hpp"
+#include "amuse/Voice.hpp"
+
+namespace amuse
+{
+
+size_t BooBackendVoice::VoiceCallback::supplyAudio(boo::IAudioVoice&,
+                                                   size_t frames, int16_t* data)
+{
+    return m_parent.m_clientVox.supplyAudio(frames, data);
+}
+
+BooBackendVoice::BooBackendVoice(boo::IAudioVoiceEngine& engine, Voice& clientVox,
+                                 double sampleRate, bool dynamicPitch)
+: m_clientVox(clientVox), m_cb(*this),
+  m_booVoice(engine.allocateNewMonoVoice(sampleRate, &m_cb, dynamicPitch))
+{}
+
+void BooBackendVoice::setMatrixCoefficients(const float coefs[8])
+{
+    m_booVoice->setMonoMatrixCoefficients(coefs);
+}
+
+void BooBackendVoice::setPitchRatio(double ratio)
+{
+    m_booVoice->setPitchRatio(ratio);
+}
+
+void BooBackendVoice::start()
+{
+    m_booVoice->start();
+}
+
+void BooBackendVoice::stop()
+{
+    m_booVoice->stop();
+}
+
+BooBackendVoiceAllocator::BooBackendVoiceAllocator(boo::IAudioVoiceEngine& booEngine)
+: m_booEngine(booEngine)
+{}
+
+std::unique_ptr<IBackendVoice>
+BooBackendVoiceAllocator::allocateVoice(Voice& clientVox, double sampleRate, bool dynamicPitch)
+{
+    return std::make_unique<BooBackendVoice>(m_booEngine, clientVox, sampleRate, dynamicPitch);
+}
+
+}