svapp  1.9
AudioCallbackPlayTarget.h
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00001 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
00002 
00003 /*
00004     Sonic Visualiser
00005     An audio file viewer and annotation editor.
00006     Centre for Digital Music, Queen Mary, University of London.
00007     This file copyright 2006 Chris Cannam.
00008     
00009     This program is free software; you can redistribute it and/or
00010     modify it under the terms of the GNU General Public License as
00011     published by the Free Software Foundation; either version 2 of the
00012     License, or (at your option) any later version.  See the file
00013     COPYING included with this distribution for more information.
00014 */
00015 
00016 #ifndef _AUDIO_CALLBACK_PLAY_TARGET_H_
00017 #define _AUDIO_CALLBACK_PLAY_TARGET_H_
00018 
00019 #include <QObject>
00020 
00021 class AudioCallbackPlaySource;
00022 
00023 class AudioCallbackPlayTarget : public QObject
00024 {
00025     Q_OBJECT
00026 
00027 public:
00028     AudioCallbackPlayTarget(AudioCallbackPlaySource *source);
00029     virtual ~AudioCallbackPlayTarget();
00030 
00031     virtual bool isOK() const = 0;
00032 
00033     virtual void shutdown() = 0;
00034 
00035     virtual double getCurrentTime() const = 0;
00036 
00037     float getOutputGain() const {
00038         return m_outputGain;
00039     }
00040 
00041 public slots:
00045     virtual void setOutputGain(float gain);
00046 
00055     virtual void sourceModelReplaced() = 0;
00056 
00057 protected:
00058     AudioCallbackPlaySource *m_source;
00059     float m_outputGain;
00060 };
00061 
00062 #endif
00063