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1 /* This file is part of the KDE project. |
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2 |
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3 Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 |
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5 This library is free software: you can redistribute it and/or modify |
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6 it under the terms of the GNU Lesser General Public License as published by |
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7 the Free Software Foundation, either version 2.1 or 3 of the License. |
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8 |
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9 This library is distributed in the hope that it will be useful, |
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10 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 GNU Lesser General Public License for more details. |
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13 |
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14 You should have received a copy of the GNU Lesser General Public License |
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15 along with this library. If not, see <http://www.gnu.org/licenses/>. |
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16 |
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17 */ |
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18 |
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19 #ifndef PHONON_MMF_AUDIOOUTPUT_H |
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20 #define PHONON_MMF_AUDIOOUTPUT_H |
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21 |
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22 #include <QHash> |
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23 |
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24 #include "mmf_medianode.h" |
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25 #include <phonon/audiooutputinterface.h> |
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26 |
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27 QT_BEGIN_NAMESPACE |
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28 |
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29 namespace Phonon |
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30 { |
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31 namespace MMF |
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32 { |
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33 class Backend; |
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34 class VolumeObserver; |
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35 |
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36 /** |
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37 * @short AudioOutputInterface implementation for MMF. |
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38 * |
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39 * Forwards volume commands to the VolumeObserver instance, |
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40 * which is provided by the backend when MediaNode objects are |
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41 * connected. |
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42 * |
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43 * \section volume Volume |
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44 * |
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45 * Phonon's concept on volume is from 0.0 to 1.0, and from 1< it does |
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46 * voltage multiplication. CDrmPlayerUtility goes from 1 to |
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47 * CDrmPlayerUtility::MaxVolume(). We apply some basic math to convert |
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48 * between the two. |
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49 * |
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50 * @author Frans Englich<frans.englich@nokia.com> |
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51 */ |
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52 class AudioOutput : public MediaNode |
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53 , public AudioOutputInterface |
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54 { |
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55 Q_OBJECT |
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56 Q_INTERFACES(Phonon::AudioOutputInterface) |
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57 |
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58 public: |
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59 AudioOutput(Backend *backend, QObject *parent); |
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60 virtual qreal volume() const; |
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61 virtual void setVolume(qreal volume); |
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62 |
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63 virtual int outputDevice() const; |
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64 |
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65 /** |
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66 * Has no effect. |
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67 */ |
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68 virtual bool setOutputDevice(int); |
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69 |
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70 static QHash<QByteArray, QVariant> audioOutputDescription(int index); |
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71 |
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72 enum Constants |
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73 { |
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74 AudioOutputDeviceID = 0 |
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75 }; |
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76 |
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77 protected: |
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78 virtual bool activateOnMediaObject(MediaObject *mo); |
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79 |
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80 Q_SIGNALS: |
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81 void volumeChanged(qreal volume); |
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82 void audioDeviceFailed(); |
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83 |
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84 private: |
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85 |
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86 void setVolumeObserver(VolumeObserver* observer); |
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87 |
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88 qreal m_volume; |
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89 |
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90 // Not owned |
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91 VolumeObserver* m_observer; |
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92 }; |
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93 } |
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94 } |
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95 |
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96 QT_END_NAMESPACE |
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97 |
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98 #endif |