diff audioio/AudioGenerator.h @ 0:cd5d7ff8ef38

* Reorganising code base.  This revision will not compile.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/audioio/AudioGenerator.h	Mon Jul 31 12:03:45 2006 +0000
@@ -0,0 +1,144 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    This file copyright 2006 Chris Cannam.
+    
+    This program is free software; you can redistribute it and/or
+    modify it under the terms of the GNU General Public License as
+    published by the Free Software Foundation; either version 2 of the
+    License, or (at your option) any later version.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _AUDIO_GENERATOR_H_
+#define _AUDIO_GENERATOR_H_
+
+class Model;
+class NoteModel;
+class DenseTimeValueModel;
+class SparseOneDimensionalModel;
+class RealTimePluginInstance;
+
+#include <QObject>
+#include <QMutex>
+
+#include <set>
+#include <map>
+
+class AudioGenerator : public QObject
+{
+    Q_OBJECT
+
+public:
+    AudioGenerator();
+    virtual ~AudioGenerator();
+
+    /**
+     * Return true if the given model is of a type that we generally
+     * know how to play.  This doesn't guarantee that a specific
+     * AudioGenerator will actually produce sounds for it (for
+     * example, it may turn out that a vital plugin is missing).
+     */
+    static bool canPlay(const Model *model);
+
+    static QString getDefaultPlayPluginId(const Model *model);
+    static QString getDefaultPlayPluginConfiguration(const Model *model);
+
+    /**
+     * Add a data model to be played from and initialise any necessary
+     * audio generation code.  Returns true if the model will be
+     * played.  (The return value test here is stricter than that for
+     * canPlay, above.)  The model will be added regardless of the
+     * return value.
+     */
+    virtual bool 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, size_t fadeIn = 0, size_t fadeOut = 0);
+
+protected slots:
+    void playPluginIdChanged(const Model *, QString);
+    void playPluginConfigurationChanged(const Model *, QString);
+
+protected:
+    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<const Model *, RealTimePluginInstance *> PluginMap;
+
+    typedef std::set<NoteOff, NoteOff::Comparator> NoteOffSet;
+    typedef std::map<const Model *, NoteOffSet> NoteOffMap;
+
+    QMutex m_mutex;
+    PluginMap m_synthMap;
+    NoteOffMap m_noteOffs;
+    static QString m_sampleDir;
+
+    virtual RealTimePluginInstance *loadPluginFor(const Model *model);
+    virtual RealTimePluginInstance *loadPlugin(QString id, QString program);
+    static QString getSampleDir();
+    static void setSampleDir(RealTimePluginInstance *plugin);
+
+    virtual size_t mixDenseTimeValueModel
+    (DenseTimeValueModel *model, size_t startFrame, size_t frameCount,
+     float **buffer, float gain, float pan, size_t fadeIn, size_t fadeOut);
+
+    virtual size_t mixSparseOneDimensionalModel
+    (SparseOneDimensionalModel *model, size_t startFrame, size_t frameCount,
+     float **buffer, float gain, float pan, size_t fadeIn, size_t fadeOut);
+
+    virtual size_t mixNoteModel
+    (NoteModel *model, size_t startFrame, size_t frameCount,
+     float **buffer, float gain, float pan, size_t fadeIn, size_t fadeOut);
+
+    static const size_t m_pluginBlockSize;
+};
+
+#endif
+