comparison data/fileio/AudioFileReader.h @ 0:fc9323a41f5a

start base : Sonic Visualiser sv1-1.0rc1

+/* -*- 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 _AUDIO_FILE_READER_H_
+#define _AUDIO_FILE_READER_H_
+
+#include <QString>
+#include "model/Model.h" // for SampleBlock
+
+class AudioFileReader : public QObject
+{
+    Q_OBJECT
+
+public:
+    virtual ~AudioFileReader() { }
+
+    bool isOK() const { return (m_channelCount > 0); }
+
+    virtual QString getError() const { return ""; }
+
+    size_t getFrameCount() const { return m_frameCount; }
+    size_t getChannelCount() const { return m_channelCount; }
+    size_t getSampleRate() const { return m_sampleRate; }
+    
+    /** 
+     * 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(size_t start, size_t count,
+				      SampleBlock &frames) const = 0;
+
+    virtual bool isUpdating() const { return false; }
+
+signals:
+    void frameCountChanged();
+    
+protected:
+    size_t m_frameCount;
+    size_t m_channelCount;
+    size_t m_sampleRate;
+};
+
+#endif