diff data/fileio/FFTDataServer.h @ 148:1a42221a1522

* Reorganising code base.  This revision will not compile.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/data/fileio/FFTDataServer.h	Mon Jul 31 11:49:58 2006 +0000
@@ -0,0 +1,201 @@
+/* -*- 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 _FFT_DATA_SERVER_H_
+#define _FFT_DATA_SERVER_H_
+
+#include "base/Window.h"
+#include "base/Thread.h"
+
+#include <fftw3.h>
+
+#include <QMutex>
+#include <QWaitCondition>
+#include <QString>
+
+#include <vector>
+#include <deque>
+
+class DenseTimeValueModel;
+class FFTCache;
+
+class FFTDataServer
+{
+public:
+    static FFTDataServer *getInstance(const DenseTimeValueModel *model,
+                                      int channel,
+                                      WindowType windowType,
+                                      size_t windowSize,
+                                      size_t windowIncrement,
+                                      size_t fftSize,
+                                      bool polar,
+                                      size_t fillFromColumn = 0);
+
+    static FFTDataServer *getFuzzyInstance(const DenseTimeValueModel *model,
+                                           int channel,
+                                           WindowType windowType,
+                                           size_t windowSize,
+                                           size_t windowIncrement,
+                                           size_t fftSize,
+                                           bool polar,
+                                           size_t fillFromColumn = 0);
+
+    static void releaseInstance(FFTDataServer *);
+
+    const DenseTimeValueModel *getModel() const { return m_model; }
+    int        getChannel() const { return m_channel; }
+    WindowType getWindowType() const { return m_windower.getType(); }
+    size_t     getWindowSize() const { return m_windowSize; }
+    size_t     getWindowIncrement() const { return m_windowIncrement; }
+    size_t     getFFTSize() const { return m_fftSize; }
+    bool       getPolar() const { return m_polar; }
+
+    size_t     getWidth() const  { return m_width;  }
+    size_t     getHeight() const { return m_height; }
+
+    float      getMagnitudeAt(size_t x, size_t y);
+    float      getNormalizedMagnitudeAt(size_t x, size_t y);
+    float      getMaximumMagnitudeAt(size_t x);
+    float      getPhaseAt(size_t x, size_t y);
+    void       getValuesAt(size_t x, size_t y, float &real, float &imaginary);
+    bool       isColumnReady(size_t x);
+
+    void       suspend();
+
+    // Convenience functions:
+
+    bool isLocalPeak(size_t x, size_t y) {
+        float mag = getMagnitudeAt(x, y);
+        if (y > 0 && mag < getMagnitudeAt(x, y - 1)) return false;
+        if (y < getHeight()-1 && mag < getMagnitudeAt(x, y + 1)) return false;
+        return true;
+    }
+    bool isOverThreshold(size_t x, size_t y, float threshold) {
+        return getMagnitudeAt(x, y) > threshold;
+    }
+
+    size_t getFillCompletion() const;
+    size_t getFillExtent() const;
+
+private:
+    FFTDataServer(QString fileBaseName,
+                  const DenseTimeValueModel *model,
+                  int channel,
+                  WindowType windowType,
+                  size_t windowSize,
+                  size_t windowIncrement,
+                  size_t fftSize,
+                  bool polar,
+                  size_t fillFromColumn = 0);
+
+    virtual ~FFTDataServer();
+
+    FFTDataServer(const FFTDataServer &); // not implemented
+    FFTDataServer &operator=(const FFTDataServer &); // not implemented
+
+    typedef float fftsample;
+
+    QString m_fileBaseName;
+    const DenseTimeValueModel *m_model;
+    int m_channel;
+
+    Window<fftsample> m_windower;
+
+    size_t m_windowSize;
+    size_t m_windowIncrement;
+    size_t m_fftSize;
+    bool m_polar;
+
+    size_t m_width;
+    size_t m_height;
+    size_t m_cacheWidth;
+
+    typedef std::vector<FFTCache *> CacheVector;
+    CacheVector m_caches;
+    
+    typedef std::deque<int> IntQueue;
+    IntQueue m_dormantCaches;
+
+    int m_lastUsedCache;
+    FFTCache *getCache(size_t x, size_t &col) {
+        if (m_suspended) resume();
+        col   = x % m_cacheWidth;
+        int c = x / m_cacheWidth;
+        // The only use of m_lastUsedCache without a lock is to
+        // establish whether a cache has been created at all (they're
+        // created on demand, but not destroyed until the server is).
+        if (c == m_lastUsedCache) return m_caches[c];
+        else return getCacheAux(c);
+    }
+    bool haveCache(size_t x) {
+        int c = x / m_cacheWidth;
+        if (c == m_lastUsedCache) return true;
+        else return (m_caches[c] != 0);
+    }
+        
+    FFTCache *getCacheAux(size_t c);
+    QMutex m_writeMutex;
+    QWaitCondition m_condition;
+
+    fftsample *m_fftInput;
+    fftwf_complex *m_fftOutput;
+    float *m_workbuffer;
+    fftwf_plan m_fftPlan;
+
+    class FillThread : public Thread
+    {
+    public:
+        FillThread(FFTDataServer &server, size_t fillFromColumn) :
+            m_server(server), m_extent(0), m_completion(0),
+            m_fillFrom(fillFromColumn) { }
+
+        size_t getExtent() const { return m_extent; }
+        size_t getCompletion() const { return m_completion ? m_completion : 1; }
+        virtual void run();
+
+    protected:
+        FFTDataServer &m_server;
+        size_t m_extent;
+        size_t m_completion;
+        size_t m_fillFrom;
+    };
+
+    bool m_exiting;
+    bool m_suspended;
+    FillThread *m_fillThread;
+
+    void deleteProcessingData();
+    void fillColumn(size_t x);
+    void resume();
+
+    QString generateFileBasename() const;
+    static QString generateFileBasename(const DenseTimeValueModel *model,
+                                        int channel,
+                                        WindowType windowType,
+                                        size_t windowSize,
+                                        size_t windowIncrement,
+                                        size_t fftSize,
+                                        bool polar);
+
+    typedef std::pair<FFTDataServer *, int> ServerCountPair;
+    typedef std::map<QString, ServerCountPair> ServerMap;
+
+    static ServerMap m_servers;
+    static QMutex m_serverMapMutex;
+    static FFTDataServer *findServer(QString); // call with serverMapMutex held
+    static void purgeLimbo(int maxSize = 3); // call with serverMapMutex held
+};
+
+#endif