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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the Qt Mobility Components. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 #ifndef WAVEDECODER_H |
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43 #define WAVEDECODER_H |
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44 |
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45 // |
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46 // W A R N I N G |
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47 // ------------- |
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48 // |
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49 // This file is not part of the Qt API. It exists for the convenience |
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50 // of other Qt classes. This header file may change from version to |
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51 // version without notice, or even be removed. |
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52 // |
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53 // We mean it. |
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54 // |
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55 |
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56 #include <QtCore/qiodevice.h> |
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57 #include <qaudioformat.h> |
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58 |
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59 |
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60 QT_BEGIN_HEADER |
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61 |
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62 QT_BEGIN_NAMESPACE |
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63 |
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64 |
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65 class WaveDecoder : public QIODevice |
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66 { |
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67 Q_OBJECT |
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68 |
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69 public: |
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70 explicit WaveDecoder(QIODevice *source, QObject *parent = 0); |
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71 ~WaveDecoder(); |
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72 |
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73 QAudioFormat audioFormat() const; |
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74 int duration() const; |
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75 |
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76 qint64 size() const; |
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77 bool isSequential() const; |
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78 qint64 bytesAvailable() const; |
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79 |
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80 Q_SIGNALS: |
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81 void formatKnown(); |
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82 void invalidFormat(); |
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83 |
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84 private Q_SLOTS: |
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85 void handleData(); |
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86 |
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87 private: |
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88 qint64 readData(char *data, qint64 maxlen); |
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89 qint64 writeData(const char *data, qint64 len); |
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90 |
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91 struct chunk |
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92 { |
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93 char id[4]; |
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94 quint32 size; |
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95 }; |
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96 struct RIFFHeader |
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97 { |
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98 chunk descriptor; |
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99 char type[4]; |
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100 }; |
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101 struct WAVEHeader |
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102 { |
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103 chunk descriptor; |
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104 quint16 audioFormat; |
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105 quint16 numChannels; |
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106 quint32 sampleRate; |
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107 quint32 byteRate; |
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108 quint16 blockAlign; |
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109 quint16 bitsPerSample; |
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110 }; |
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111 struct DATAHeader |
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112 { |
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113 chunk descriptor; |
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114 }; |
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115 struct CombinedHeader |
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116 { |
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117 RIFFHeader riff; |
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118 WAVEHeader wave; |
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119 }; |
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120 |
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121 bool haveFormat; |
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122 qint64 dataSize; |
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123 qint64 remaining; |
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124 QAudioFormat format; |
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125 QIODevice *source; |
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126 CombinedHeader header; |
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127 }; |
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128 |
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129 QT_END_NAMESPACE |
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130 |
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131 QT_END_HEADER |
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132 |
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133 #endif // WAVEDECODER_H |