Overhauled audio system, now with internal mixing and sample-rate-conversion

lib/audiodev/AudioVoiceEngine.hpp

@@ -0,0 +1,51 @@
+#ifndef BOO_AUDIOVOICEENGINE_HPP
+#define BOO_AUDIOVOICEENGINE_HPP
+
+#include "boo/audiodev/IAudioVoiceEngine.hpp"
+#include "AudioVoice.hpp"
+
+namespace boo
+{
+
+/** Pertinent information from audio backend about optimal mixed-audio representation */
+struct AudioVoiceEngineMixInfo
+{
+    double m_sampleRate;
+    soxr_datatype_t m_sampleFormat;
+    unsigned m_bitsPerSample;
+    AudioChannelSet m_channels;
+    ChannelMap m_channelMap;
+    size_t m_periodFrames;
+};
+
+/** Base class for managing mixing and sample-rate-conversion amongst active voices */
+class BaseAudioVoiceEngine : public IAudioVoiceEngine
+{
+protected:
+    friend class AudioVoice;
+    AudioVoiceEngineMixInfo m_mixInfo;
+    std::list<AudioVoice*> m_activeVoices;
+
+    void _pumpAndMixVoices(size_t frames, int16_t* dataOut);
+    void _pumpAndMixVoices(size_t frames, int32_t* dataOut);
+    void _pumpAndMixVoices(size_t frames, float* dataOut);
+
+public:
+    BaseAudioVoiceEngine(const std::function<AudioVoiceEngineMixInfo()>& getEngineMixInfo);
+
+    std::unique_ptr<IAudioVoice> allocateNewMonoVoice(double sampleRate,
+                                                      IAudioVoiceCallback* cb,
+                                                      bool dynamicPitch=false);
+
+    std::unique_ptr<IAudioVoice> allocateNewStereoVoice(double sampleRate,
+                                                        IAudioVoiceCallback* cb,
+                                                        bool dynamicPitch=false);
+
+    const AudioVoiceEngineMixInfo& mixInfo() const {return m_mixInfo;}
+    AudioChannelSet getAvailableSet() {return m_mixInfo.m_channels;}
+    void pumpAndMixVoices() {}
+};
+
+}
+
+#endif // BOO_AUDIOVOICEENGINE_HPP