annotate data/model/WaveFileModel.h @ 335:02d2ad95ea52 spectrogram-cache-rejig

* Get storage advice for each cache in an FFT data server.  Allows us to be
  more confident about the actual memory situation and cut over from memory
  to disc part way through an FFT calculation if necessary.  StorageAdviser
  is now a bit too optimistic though (it's too keen to allocate large numbers
  of small blocks in memory).

/* -*- 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 and QMUL.
    
    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 _WAVE_FILE_MODEL_H_
#define _WAVE_FILE_MODEL_H_

#include "base/Thread.h"
#include <QMutex>
#include <QTimer>

#include "data/fileio/FileSource.h"

#include "RangeSummarisableTimeValueModel.h"
#include "PowerOfSqrtTwoZoomConstraint.h"

#include <stdlib.h>

class AudioFileReader;

class WaveFileModel : public RangeSummarisableTimeValueModel
{
    Q_OBJECT

public:
    WaveFileModel(FileSource source, size_t targetRate = 0);
    WaveFileModel(FileSource source, AudioFileReader *reader);
    ~WaveFileModel();

    bool isOK() const;
    bool isReady(int *) const;

    const ZoomConstraint *getZoomConstraint() const { return &m_zoomConstraint; }

    size_t getFrameCount() const;
    size_t getChannelCount() const;
    size_t getSampleRate() const;
    size_t getNativeRate() const;

    QString getTitle() const;
    QString getMaker() const;

    virtual Model *clone() const;

    float getValueMinimum() const { return -1.0f; }
    float getValueMaximum() const { return  1.0f; }

    virtual size_t getStartFrame() const { return m_startFrame; }
    virtual size_t getEndFrame() const { return m_startFrame + getFrameCount(); }

    void setStartFrame(size_t startFrame) { m_startFrame = startFrame; }

    virtual size_t getData(int channel, size_t start, size_t count,
                           float *buffer) const;

    virtual size_t getData(int channel, size_t start, size_t count,
                           double *buffer) const;

    virtual void getSummaries(size_t channel, size_t start, size_t count,
                              RangeBlock &ranges,
                              size_t &blockSize) const;

    virtual Range getSummary(size_t channel, size_t start, size_t count) const;

    virtual void toXml(QTextStream &out,
                       QString indent = "",
                       QString extraAttributes = "") const;

signals:
    void modelChanged();
    void modelChanged(size_t, size_t);
    void completionChanged();

protected slots:
    void fillTimerTimedOut();
    void cacheFilled();
    
protected:
    void initialize();

    class RangeCacheFillThread : public Thread
    {
    public:
        RangeCacheFillThread(WaveFileModel &model) :
	    m_model(model), m_fillExtent(0),
            m_frameCount(model.getFrameCount()) { }
    
	size_t getFillExtent() const { return m_fillExtent; }
        virtual void run();

    protected:
        WaveFileModel &m_model;
	size_t m_fillExtent;
        size_t m_frameCount;
    };
         
    void fillCache();

    FileSource m_source;
    QString m_path;
    AudioFileReader *m_reader;
    bool m_myReader;

    size_t m_startFrame;

    RangeBlock m_cache[2]; // interleaved at two base resolutions
    mutable QMutex m_mutex;
    RangeCacheFillThread *m_fillThread;
    QTimer *m_updateTimer;
    size_t m_lastFillExtent;
    bool m_exiting;
    static PowerOfSqrtTwoZoomConstraint m_zoomConstraint;
};    

#endif