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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 QtMultimedia module of the Qt Toolkit. |
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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 "qabstractvideobuffer_p.h" |
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43 |
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44 #include <qvariant.h> |
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45 |
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46 QT_BEGIN_NAMESPACE |
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47 |
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48 /*! |
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49 \class QAbstractVideoBuffer |
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50 \brief The QAbstractVideoBuffer class is an abstraction for video data. |
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51 \preliminary |
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52 \since 4.6 |
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53 |
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54 The QVideoFrame class makes use of a QAbstractVideoBuffer internally to reference a buffer of |
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55 video data. Creating a subclass of QAbstractVideoBuffer will allow you to construct video |
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56 frames from preallocated or static buffers. |
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57 |
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58 The contents of a buffer can be accessed by mapping the buffer to memory using the map() |
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59 function which returns a pointer to memory containing the contents of the the video buffer. |
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60 The memory returned by map() is released by calling the unmap() function. |
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61 |
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62 The handle() of a buffer may also be used to manipulate it's contents using type specific APIs. |
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63 The type of a buffer's handle is given by the handleType() function. |
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64 |
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65 \sa QVideoFrame |
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66 */ |
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67 |
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68 /*! |
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69 \enum QAbstractVideoBuffer::HandleType |
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70 |
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71 Identifies the type of a video buffers handle. |
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72 |
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73 \value NoHandle The buffer has no handle, its data can only be accessed by mapping the buffer. |
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74 \value GLTextureHandle The handle of the buffer is an OpenGL texture ID. |
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75 \value UserHandle Start value for user defined handle types. |
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76 |
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77 \sa handleType() |
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78 */ |
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79 |
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80 /*! |
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81 \enum QAbstractVideoBuffer::MapMode |
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82 |
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83 Enumerates how a video buffer's data is mapped to memory. |
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84 |
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85 \value NotMapped The video buffer has is not mapped to memory. |
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86 \value ReadOnly The mapped memory is populated with data from the video buffer when mapped, but |
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87 the content of the mapped memory may be discarded when unmapped. |
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88 \value WriteOnly The mapped memory in unitialized when mapped, and the content will be used to |
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89 populate the video buffer when unmapped. |
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90 \value ReadWrite The mapped memory is populated with data from the video buffer, and the |
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91 video buffer is repopulated with the content of the mapped memory. |
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92 |
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93 \sa mapMode(), map() |
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94 */ |
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95 |
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96 /*! |
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97 Constructs an abstract video buffer of the given \a type. |
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98 */ |
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99 |
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100 QAbstractVideoBuffer::QAbstractVideoBuffer(HandleType type) |
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101 : d_ptr(new QAbstractVideoBufferPrivate) |
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102 { |
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103 Q_D(QAbstractVideoBuffer); |
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104 |
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105 d->handleType = type; |
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106 } |
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107 |
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108 /*! |
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109 \internal |
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110 */ |
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111 |
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112 QAbstractVideoBuffer::QAbstractVideoBuffer(QAbstractVideoBufferPrivate &dd, HandleType type) |
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113 : d_ptr(&dd) |
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114 { |
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115 Q_D(QAbstractVideoBuffer); |
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116 |
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117 d->handleType = type; |
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118 } |
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119 |
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120 /*! |
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121 Destroys an abstract video buffer. |
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122 */ |
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123 |
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124 QAbstractVideoBuffer::~QAbstractVideoBuffer() |
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125 { |
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126 delete d_ptr; |
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127 } |
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128 |
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129 /*! |
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130 Returns the type of a video buffer's handle. |
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131 |
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132 \sa handle() |
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133 */ |
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134 |
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135 QAbstractVideoBuffer::HandleType QAbstractVideoBuffer::handleType() const |
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136 { |
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137 return d_func()->handleType; |
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138 } |
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139 |
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140 /*! |
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141 \fn QAbstractVideoBuffer::mapMode() const |
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142 |
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143 Returns the mode a video buffer is mapped in. |
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144 |
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145 \sa map() |
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146 */ |
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147 |
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148 /*! |
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149 \fn QAbstractVideoBuffer::map(MapMode mode, int *numBytes, int *bytesPerLine) |
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150 |
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151 Maps the contents of a video buffer to memory. |
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152 |
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153 The map \a mode indicates whether the contents of the mapped memory should be read from and/or |
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154 written to the buffer. If the map mode includes the QAbstractVideoBuffer::ReadOnly flag the |
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155 mapped memory will be populated with the content of the video buffer when mapped. If the map |
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156 mode includes the QAbstractVideoBuffer::WriteOnly flag the content of the mapped memory will be |
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157 persisted in the buffer when unmapped. |
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158 |
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159 When access to the data is no longer needed be sure to call the unmap() function to release the |
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160 mapped memory. |
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161 |
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162 Returns a pointer to the mapped memory region, or a null pointer if the mapping failed. The |
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163 size in bytes of the mapped memory region is returned in \a numBytes, and the line stride in \a |
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164 bytesPerLine. |
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165 |
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166 When access to the data is no longer needed be sure to unmap() the buffer. |
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167 |
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168 \note Writing to memory that is mapped as read-only is undefined, and may result in changes |
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169 to shared data. |
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170 |
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171 \sa unmap(), mapMode() |
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172 */ |
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173 |
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174 /*! |
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175 \fn QAbstractVideoBuffer::unmap() |
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176 |
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177 Releases the memory mapped by the map() function |
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178 |
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179 If the \l {QAbstractVideoBuffer::MapMode}{MapMode} included the QAbstractVideoBuffer::WriteOnly |
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180 flag this will persist the current content of the mapped memory to the video frame. |
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181 |
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182 \sa map() |
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183 */ |
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184 |
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185 /*! |
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186 Returns a type specific handle to the data buffer. |
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187 |
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188 The type of the handle is given by handleType() function. |
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189 |
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190 \sa handleType() |
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191 */ |
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192 |
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193 QVariant QAbstractVideoBuffer::handle() const |
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194 { |
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195 return QVariant(); |
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196 } |
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197 |
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198 |
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199 QT_END_NAMESPACE |