comparison data/model/ReadOnlyWaveFileModel.h @ 1122:b9faee02afa5 recording

Make WritableWaveFileModel a true WaveFileModel (and ReadOnlyWaveFileModel the other sort of it). Enable recording from an empty session using that.

+/* -*- 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 READ_ONLY_WAVE_FILE_MODEL_H
+#define READ_ONLY_WAVE_FILE_MODEL_H
+
+#include "WaveFileModel.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 ReadOnlyWaveFileModel : public WaveFileModel
+{
+    Q_OBJECT
+
+public:
+    ReadOnlyWaveFileModel(FileSource source, sv_samplerate_t targetRate = 0);
+    ReadOnlyWaveFileModel(FileSource source, AudioFileReader *reader);
+    ~ReadOnlyWaveFileModel();
+
+    bool isOK() const;
+    bool isReady(int *) const;
+
+    const ZoomConstraint *getZoomConstraint() const { return &m_zoomConstraint; }
+
+    sv_frame_t getFrameCount() const;
+    int getChannelCount() const;
+    sv_samplerate_t getSampleRate() const;
+    sv_samplerate_t getNativeRate() const;
+
+    QString getTitle() const;
+    QString getMaker() const;
+    QString getLocation() const;
+
+    QString getLocalFilename() const;
+
+    float getValueMinimum() const { return -1.0f; }
+    float getValueMaximum() const { return  1.0f; }
+
+    virtual sv_frame_t getStartFrame() const { return m_startFrame; }
+    virtual sv_frame_t getEndFrame() const { return m_startFrame + getFrameCount(); }
+
+    void setStartFrame(sv_frame_t startFrame) { m_startFrame = startFrame; }
+
+    virtual sv_frame_t getData(int channel, sv_frame_t start, sv_frame_t count,
+                               float *buffer) const;
+
+    virtual sv_frame_t getMultiChannelData(int fromchannel, int tochannel,
+                                           sv_frame_t start, sv_frame_t count,
+                                           float **buffers) const;
+
+    virtual int getSummaryBlockSize(int desired) const;
+
+    virtual void getSummaries(int channel, sv_frame_t start, sv_frame_t count,
+                              RangeBlock &ranges,
+                              int &blockSize) const;
+
+    virtual Range getSummary(int channel, sv_frame_t start, sv_frame_t count) const;
+
+    QString getTypeName() const { return tr("Wave File"); }
+
+    virtual void toXml(QTextStream &out,
+                       QString indent = "",
+                       QString extraAttributes = "") const;
+
+protected slots:
+    void fillTimerTimedOut();
+    void cacheFilled();
+    
+protected:
+    void initialize();
+
+    class RangeCacheFillThread : public Thread
+    {
+    public:
+        RangeCacheFillThread(ReadOnlyWaveFileModel &model) :
+	    m_model(model), m_fillExtent(0),
+            m_frameCount(model.getFrameCount()) { }
+    
+	sv_frame_t getFillExtent() const { return m_fillExtent; }
+        virtual void run();
+
+    protected:
+        ReadOnlyWaveFileModel &m_model;
+	sv_frame_t m_fillExtent;
+        sv_frame_t m_frameCount;
+    };
+         
+    void fillCache();
+
+    FileSource m_source;
+    QString m_path;
+    AudioFileReader *m_reader;
+    bool m_myReader;
+
+    sv_frame_t m_startFrame;
+
+    RangeBlock m_cache[2]; // interleaved at two base resolutions
+    mutable QMutex m_mutex;
+    RangeCacheFillThread *m_fillThread;
+    QTimer *m_updateTimer;
+    sv_frame_t m_lastFillExtent;
+    bool m_exiting;
+    static PowerOfSqrtTwoZoomConstraint m_zoomConstraint;
+
+    mutable SampleBlock m_directRead;
+    mutable sv_frame_t m_lastDirectReadStart;
+    mutable sv_frame_t m_lastDirectReadCount;
+    mutable QMutex m_directReadMutex;
+};    
+
+#endif