comparison audioio/AudioGenerator.h @ 0:db6fcbd4405c

initial import

+/* -*- c-basic-offset: 4 -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    A waveform viewer and audio annotation editor.
+    Chris Cannam, Queen Mary University of London, 2005
+    
+    This is experimental software.  Not for distribution.
+*/
+
+#ifndef _AUDIO_GENERATOR_H_
+#define _AUDIO_GENERATOR_H_
+
+class Model;
+class ViewManager;
+class DenseTimeValueModel;
+class SparseOneDimensionalModel;
+class RealTimePluginInstance;
+
+#include <set>
+#include <map>
+
+class AudioGenerator
+{
+public:
+    AudioGenerator(ViewManager *);
+    virtual ~AudioGenerator();
+
+    /**
+     * Add a data model to be played from and initialise any
+     * necessary audio generation code.
+     */
+    virtual void addModel(Model *model);
+
+    /**
+     * Remove a model.
+     */
+    virtual void removeModel(Model *model);
+
+    /**
+     * Remove all models.
+     */
+    virtual void clearModels();
+
+    /**
+     * Reset playback, clearing plugins and the like.
+     */
+    virtual void reset();
+
+    /**
+     * Set the target channel count.  The buffer parameter to mixModel
+     * must always point to at least this number of arrays.
+     */
+    virtual void setTargetChannelCount(size_t channelCount);
+
+    /**
+     * Return the internal processing block size.  The frameCount
+     * argument to all mixModel calls must be a multiple of this
+     * value.
+     */
+    virtual size_t getBlockSize() const;
+
+    /**
+     * Mix a single model into an output buffer.
+     */
+    virtual size_t mixModel(Model *model, size_t startFrame, size_t frameCount,
+			    float **buffer);
+
+protected:
+    ViewManager *m_viewManager;
+    size_t       m_sourceSampleRate;
+    size_t       m_targetChannelCount;
+
+    struct NoteOff {
+
+	int pitch;
+	size_t frame;
+
+	struct Comparator {
+	    bool operator()(const NoteOff &n1, const NoteOff &n2) const {
+		return n1.frame < n2.frame;
+	    }
+	};
+    };
+
+    typedef std::map<SparseOneDimensionalModel *,
+		     RealTimePluginInstance *> PluginMap;
+
+    typedef std::set<NoteOff, NoteOff::Comparator> NoteOffSet;
+    typedef std::map<SparseOneDimensionalModel *, NoteOffSet> NoteOffMap;
+
+    PluginMap m_synthMap;
+    NoteOffMap m_noteOffs;
+
+    virtual size_t mixDenseTimeValueModel
+    (DenseTimeValueModel *model, size_t startFrame, size_t frameCount,
+     float **buffer, float gain, float pan);
+
+    virtual size_t mixSparseOneDimensionalModel
+    (SparseOneDimensionalModel *model, size_t startFrame, size_t frameCount,
+     float **buffer, float gain, float pan);
+
+    static const size_t m_pluginBlockSize;
+};
+
+#endif
+