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1 /**************************************************************************** |
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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 ** 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 #include "directshowpinenum.h" |
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43 |
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44 #include <QtMultimedia> |
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45 |
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46 DirectShowPinEnum::DirectShowPinEnum(const QList<IPin *> &pins) |
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47 : m_ref(1) |
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48 , m_pins(pins) |
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49 , m_index(0) |
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50 { |
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51 foreach (IPin *pin, m_pins) |
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52 pin->AddRef(); |
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53 } |
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54 |
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55 DirectShowPinEnum::~DirectShowPinEnum() |
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56 { |
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57 foreach (IPin *pin, m_pins) |
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58 pin->Release(); |
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59 } |
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60 |
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61 HRESULT DirectShowPinEnum::QueryInterface(REFIID riid, void **ppvObject) |
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62 { |
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63 if (riid == IID_IUnknown |
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64 || riid == IID_IEnumPins) { |
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65 AddRef(); |
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66 |
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67 *ppvObject = static_cast<IEnumPins *>(this); |
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68 |
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69 return S_OK; |
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70 } else { |
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71 *ppvObject = 0; |
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72 |
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73 return E_NOINTERFACE; |
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74 } |
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75 } |
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76 |
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77 ULONG DirectShowPinEnum::AddRef() |
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78 { |
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79 return InterlockedIncrement(&m_ref); |
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80 } |
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81 |
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82 ULONG DirectShowPinEnum::Release() |
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83 { |
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84 ULONG ref = InterlockedDecrement(&m_ref); |
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85 |
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86 if (ref == 0) { |
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87 delete this; |
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88 } |
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89 |
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90 return ref; |
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91 } |
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92 |
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93 HRESULT DirectShowPinEnum::Next(ULONG cPins, IPin **ppPins, ULONG *pcFetched) |
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94 { |
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95 if (ppPins && (pcFetched || cPins == 1)) { |
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96 ULONG count = qBound<ULONG>(0, cPins, m_pins.count() - m_index); |
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97 |
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98 for (ULONG i = 0; i < count; ++i, ++m_index) { |
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99 ppPins[i] = m_pins.at(m_index); |
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100 ppPins[i]->AddRef(); |
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101 } |
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102 |
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103 if (pcFetched) |
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104 *pcFetched = count; |
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105 |
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106 return count == cPins ? S_OK : S_FALSE; |
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107 } else { |
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108 return E_POINTER; |
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109 } |
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110 } |
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111 |
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112 HRESULT DirectShowPinEnum::Skip(ULONG cPins) |
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113 { |
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114 m_index = qMin(int(m_index + cPins), m_pins.count()); |
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115 |
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116 return m_index < m_pins.count() ? S_OK : S_FALSE; |
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117 } |
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118 |
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119 HRESULT DirectShowPinEnum::Reset() |
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120 { |
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121 m_index = 0; |
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122 |
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123 return S_OK; |
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124 } |
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125 |
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126 HRESULT DirectShowPinEnum::Clone(IEnumPins **ppEnum) |
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127 { |
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128 if (ppEnum) { |
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129 *ppEnum = new DirectShowPinEnum(m_pins); |
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130 |
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131 return S_OK; |
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132 } else { |
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133 return E_POINTER; |
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134 } |
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135 } |