diff runner/MultiplexedReader.h @ 106:de76b2df518f multiplex

Start on multiplex implementation

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/runner/MultiplexedReader.h	Wed Oct 01 18:38:32 2014 +0100
@@ -0,0 +1,93 @@
+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Annotator
+    A utility for batch feature extraction from audio files.
+    Mark Levy, Chris Sutton and Chris Cannam, Queen Mary, University of London.
+    Copyright 2007-2014 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 _MULTIPLEXED_READER_H_
+#define _MULTIPLEXED_READER_H_
+
+#include "data/fileio/AudioFileReader.h"
+
+#include <QString>
+#include <QList>
+
+typedef std::vector<float> SampleBlock;
+
+class MultiplexedReader : public QObject
+{
+    Q_OBJECT
+
+public:
+    MultiplexedReader(QList<AudioFileReader *> readers);
+    virtual ~MultiplexedReader() { }
+
+    //!!! the rest of this is currently still from AudioFileReader.h! Finish!
+
+
+
+
+    bool isOK() const { return (m_channelCount > 0); }
+
+    virtual QString getError() const { return ""; }
+
+    int getFrameCount() const { return m_frameCount; }
+    int getChannelCount() const { return m_channelCount; }
+    int getSampleRate() const { return m_sampleRate; }
+
+    virtual int getNativeRate() const { return m_sampleRate; } // if resampled
+
+    /**
+     * Return true if this file supports fast seek and random
+     * access. Typically this will be true for uncompressed formats
+     * and false for compressed ones.
+     */
+    virtual bool isQuicklySeekable() const = 0;
+
+    /** 
+     * Return interleaved samples for count frames from index start.
+     * The resulting sample block will contain count *
+     * getChannelCount() samples (or fewer if end of file is reached).
+     *
+     * The subclass implementations of this function must be
+     * thread-safe -- that is, safe to call from multiple threads with
+     * different arguments on the same object at the same time.
+     */
+    virtual void getInterleavedFrames(int start, int count,
+				      SampleBlock &frames) const = 0;
+
+    /**
+     * Return de-interleaved samples for count frames from index
+     * start.  Implemented in this class (it calls
+     * getInterleavedFrames and de-interleaves).  The resulting vector
+     * will contain getChannelCount() sample blocks of count samples
+     * each (or fewer if end of file is reached).
+     */
+    virtual void getDeInterleavedFrames(int start, int count,
+                                        std::vector<SampleBlock> &frames) const;
+
+    // only subclasses that do not know exactly how long the audio
+    // file is until it's been completely decoded should implement this
+    virtual int getDecodeCompletion() const { return 100; } // %
+
+    virtual bool isUpdating() const { return false; }
+
+signals:
+    void frameCountChanged();
+    
+protected:
+    int m_frameCount;
+    int m_channelCount;
+    int m_sampleRate;
+};
+
+#endif