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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 // |
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43 // W A R N I N G |
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44 // ------------- |
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45 // |
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46 // This file is not part of the Qt API. It exists for the convenience |
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47 // of other Qt classes. This header file may change from version to |
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48 // version without notice, or even be removed. |
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49 // |
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50 // We mean it. |
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51 // |
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52 |
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53 |
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54 #ifndef QAUDIO_MAC_P_H |
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55 #define QAUDIO_MAC_P_H |
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56 |
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57 #include <CoreAudio/CoreAudio.h> |
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58 |
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59 #include <QtCore/qdebug.h> |
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60 #include <QtCore/qatomic.h> |
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61 |
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62 #include <qaudioformat.h> |
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63 |
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64 QT_BEGIN_HEADER |
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65 |
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66 QT_BEGIN_NAMESPACE |
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67 |
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68 |
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69 extern QDebug operator<<(QDebug dbg, const QAudioFormat& audioFormat); |
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70 |
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71 extern QAudioFormat toQAudioFormat(const AudioStreamBasicDescription& streamFormat); |
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72 extern AudioStreamBasicDescription toAudioStreamBasicDescription(QAudioFormat const& audioFormat); |
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73 |
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74 class QAudioRingBuffer |
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75 { |
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76 public: |
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77 typedef QPair<char*, int> Region; |
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78 |
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79 QAudioRingBuffer(int bufferSize); |
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80 ~QAudioRingBuffer(); |
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81 |
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82 Region acquireReadRegion(int size) |
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83 { |
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84 const int used = m_bufferUsed.fetchAndAddAcquire(0); |
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85 |
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86 if (used > 0) { |
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87 const int readSize = qMin(size, qMin(m_bufferSize - m_readPos, used)); |
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88 |
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89 return readSize > 0 ? Region(m_buffer + m_readPos, readSize) : Region(0, 0); |
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90 } |
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91 |
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92 return Region(0, 0); |
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93 } |
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94 |
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95 void releaseReadRegion(Region const& region) |
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96 { |
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97 m_readPos = (m_readPos + region.second) % m_bufferSize; |
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98 |
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99 m_bufferUsed.fetchAndAddRelease(-region.second); |
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100 } |
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101 |
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102 Region acquireWriteRegion(int size) |
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103 { |
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104 const int free = m_bufferSize - m_bufferUsed.fetchAndAddAcquire(0); |
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105 |
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106 if (free > 0) { |
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107 const int writeSize = qMin(size, qMin(m_bufferSize - m_writePos, free)); |
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108 |
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109 return writeSize > 0 ? Region(m_buffer + m_writePos, writeSize) : Region(0, 0); |
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110 } |
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111 |
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112 return Region(0, 0); |
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113 } |
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114 |
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115 void releaseWriteRegion(Region const& region) |
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116 { |
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117 m_writePos = (m_writePos + region.second) % m_bufferSize; |
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118 |
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119 m_bufferUsed.fetchAndAddRelease(region.second); |
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120 } |
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121 |
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122 int used() const; |
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123 int free() const; |
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124 int size() const; |
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125 |
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126 void reset(); |
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127 |
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128 private: |
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129 int m_bufferSize; |
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130 int m_readPos; |
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131 int m_writePos; |
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132 char* m_buffer; |
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133 QAtomicInt m_bufferUsed; |
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134 }; |
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135 |
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136 QT_END_NAMESPACE |
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137 |
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138 QT_END_HEADER |
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139 |
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140 #endif // QAUDIO_MAC_P_H |
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141 |
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142 |