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1 /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
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2
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3 /*
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4 Sonic Visualiser
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5 An audio file viewer and annotation editor.
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6 Centre for Digital Music, Queen Mary, University of London.
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7 This file copyright 2006 Chris Cannam.
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8
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9 This program is free software; you can redistribute it and/or
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10 modify it under the terms of the GNU General Public License as
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11 published by the Free Software Foundation; either version 2 of the
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12 License, or (at your option) any later version. See the file
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13 COPYING included with this distribution for more information.
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14 */
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15
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16 #ifndef _AUDIO_CALLBACK_PLAY_TARGET_H_
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17 #define _AUDIO_CALLBACK_PLAY_TARGET_H_
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18
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19 #include <QObject>
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20
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21 class AudioCallbackPlaySource;
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22
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23 class AudioCallbackPlayTarget : public QObject
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24 {
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25 Q_OBJECT
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26
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27 public:
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28 AudioCallbackPlayTarget(AudioCallbackPlaySource *source);
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29 virtual ~AudioCallbackPlayTarget();
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30
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31 virtual bool isOK() const = 0;
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32
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33 virtual void shutdown() = 0;
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34
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35 virtual double getCurrentTime() const = 0;
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36
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37 float getOutputGain() const {
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38 return m_outputGain;
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39 }
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40
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41 public slots:
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42 /**
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43 * Set the playback gain (0.0 = silence, 1.0 = levels unmodified)
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44 */
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45 virtual void setOutputGain(float gain);
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46
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47 /**
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48 * The main source model (providing the playback sample rate) has
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49 * been changed. The target should query the source's sample
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50 * rate, set its output sample rate accordingly, and call back on
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51 * the source's setTargetSampleRate to indicate what sample rate
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52 * it succeeded in setting at the output. If this differs from
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53 * the model rate, the source will resample.
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54 */
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55 virtual void sourceModelReplaced() = 0;
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56
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57 protected:
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58 AudioCallbackPlaySource *m_source;
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59 float m_outputGain;
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60 };
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61
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62 #endif
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63
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