view data/model/WaveFileModel.h @ 348:edda24bb85fc

* Skip ID3 block when reading MP3 files (so long as ID3 support is included)
* Show progress when retrieving audio file from playlist
* Avoid -- but do not actually fix -- segmentation fault on exit.  I am
  totally stumped at the moment about why both the PA and JACK audio targets
  should crash when properly shut down.  For the moment, we just don't shut
  them down...
* Fix incorrect behaviour (introduced on Friday as part of a different fix)
  when replacing main model in situation where no current main model exists

/* -*- 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;
    QString getLocation() 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;

    QString getTypeName() const { return tr("Wave File"); }

    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