Integrate QAbstractVideoSurface API.

This introduces a QAbstractVideoSurface interface for implementing arbitrary
video outputs, and a QVideoFrame type.  Also included is the
QVideoSurfaceFormat class which is used to configure the input to a video
surface, and the QAbstractVideoBuffer class which allows QVideoFrames
to be constructed from non-native frame types.

Reviewed-by: Dmytro Poplavskiy

1 files changed, 129 insertions, 0 deletions

diff --git a/src/multimedia/video/qmemoryvideobuffer.cpp b/src/multimedia/video/qmemoryvideobuffer.cpp
new file mode 100644
index 0000000..f457820
--- /dev/null
+++ b/src/multimedia/video/qmemoryvideobuffer.cpp
@@ -0,0 +1,129 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtMultimedia module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://qt.nokia.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qmemoryvideobuffer_p.h"
+
+#include <private/qabstractvideobuffer_p.h>
+#include <qbytearray.h>
+
+QT_BEGIN_NAMESPACE
+
+class QMemoryVideoBufferPrivate : public QAbstractVideoBufferPrivate
+{
+public:
+    QMemoryVideoBufferPrivate()
+        : bytesPerLine(0)
+        , mapMode(QAbstractVideoBuffer::NotMapped)
+    {
+    }
+
+    int bytesPerLine;
+    QAbstractVideoBuffer::MapMode mapMode;
+    QByteArray data;
+};
+
+/*!
+    \class QMemoryVideoBuffer
+    \brief The QMemoryVideoBuffer class provides a system memory allocated video data buffer.
+    \internal
+
+    QMemoryVideoBuffer is the default video buffer for allocating system memory.  It may be used to
+    allocate memory for a QVideoFrame without implementing your own QAbstractVideoBuffer.
+*/
+
+/*!
+    Constructs a video buffer with an image stride of \a bytesPerLine from a byte \a array.
+*/
+QMemoryVideoBuffer::QMemoryVideoBuffer(const QByteArray &array, int bytesPerLine)
+    : QAbstractVideoBuffer(*new QMemoryVideoBufferPrivate, NoHandle)
+{
+    Q_D(QMemoryVideoBuffer);
+
+    d->data = array;
+    d->bytesPerLine = bytesPerLine;
+}
+
+/*!
+    Destroys a system memory allocated video buffer.
+*/
+QMemoryVideoBuffer::~QMemoryVideoBuffer()
+{
+}
+
+/*!
+    \reimp
+*/
+QAbstractVideoBuffer::MapMode QMemoryVideoBuffer::mapMode() const
+{
+    return d_func()->mapMode;
+}
+
+/*!
+    \reimp
+*/
+uchar *QMemoryVideoBuffer::map(MapMode mode, int *numBytes, int *bytesPerLine)
+{
+    Q_D(QMemoryVideoBuffer);
+
+    if (d->mapMode == NotMapped && d->data.data() && mode != NotMapped) {
+        d->mapMode = mode;
+
+        if (numBytes)
+            *numBytes = d->data.size();
+
+        if (bytesPerLine)
+            *bytesPerLine = d->bytesPerLine;
+
+        return reinterpret_cast<uchar *>(d->data.data());
+    } else {
+        return 0;
+    }
+}
+
+/*!
+    \reimp
+*/
+void QMemoryVideoBuffer::unmap()
+{
+    d_func()->mapMode = NotMapped;
+}
+
+QT_END_NAMESPACE