QMemoryVideoBuffer Class Reference

The QMemoryVideoBuffer class provides a system memory allocated video data buffer. More...

#include <qmemoryvideobuffer_p.h>

Inheritance diagram for QMemoryVideoBuffer:

Public Functions
uchar *	map (MapMode mode, int *numBytes, int *bytesPerLine)
	Reimplemented Function More...
MapMode	mapMode () const
	Reimplemented Function More...
	QMemoryVideoBuffer (const QByteArray &data, int bytesPerLine)
	Constructs a video buffer with an image stride of bytesPerLine from a byte array. More...
void	unmap ()
	Reimplemented Function More...
	~QMemoryVideoBuffer ()
	Destroys a system memory allocated video buffer. More...
Public Functions inherited from QAbstractVideoBuffer
virtual QVariant	handle () const
	Returns a type specific handle to the data buffer. More...
HandleType	handleType () const
	Returns the type of a video buffer's handle. More...
	QAbstractVideoBuffer (HandleType type)
	Constructs an abstract video buffer of the given type. More...
virtual	~QAbstractVideoBuffer ()
	Destroys an abstract video buffer. More...

Additional Inherited Members
Public Types inherited from QAbstractVideoBuffer
enum	HandleType {   NoHandle, GLTextureHandle, XvShmImageHandle, CoreImageHandle,   QPixmapHandle, UserHandle = 1000 }
	Identifies the type of a video buffers handle. More...
enum	MapMode { NotMapped = 0x00, ReadOnly = 0x01, WriteOnly = 0x02, ReadWrite = ReadOnly | WriteOnly }
	Enumerates how a video buffer's data is mapped to memory. More...
Protected Functions inherited from QAbstractVideoBuffer
	QAbstractVideoBuffer (QAbstractVideoBufferPrivate &dd, HandleType type)
Protected Variables inherited from QAbstractVideoBuffer
QAbstractVideoBufferPrivate *	d_ptr

Detailed Description

The QMemoryVideoBuffer class provides a system memory allocated video data buffer.

Warning

This function is not part of the public interface.

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.

Definition at line 66 of file qmemoryvideobuffer_p.h.

Constructors and Destructors

QMemoryVideoBuffer()

QMemoryVideoBuffer::QMemoryVideoBuffer	(	const QByteArray &	data,
		int	bytesPerLine
	)

Constructs a video buffer with an image stride of bytesPerLine from a byte array.

Definition at line 78 of file qmemoryvideobuffer.cpp.

    : QAbstractVideoBuffer(*new QMemoryVideoBufferPrivate, NoHandle)
{
    Q_D(QMemoryVideoBuffer);

    d->data = array;
    d->bytesPerLine = bytesPerLine;
}

~QMemoryVideoBuffer()

QMemoryVideoBuffer::~QMemoryVideoBuffer

(

)

Destroys a system memory allocated video buffer.

Definition at line 90 of file qmemoryvideobuffer.cpp.

{
}

Functions

map()

uchar * QMemoryVideoBuffer::map ( MapMode  mode, int *  numBytes, int *  bytesPerLine  )

virtual

Reimplemented Function

Implements QAbstractVideoBuffer.

Definition at line 105 of file qmemoryvideobuffer.cpp.

{
    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;
    }
}

mapMode()

QAbstractVideoBuffer::MapMode QMemoryVideoBuffer::mapMode ( ) const

virtual

Reimplemented Function

Implements QAbstractVideoBuffer.

Definition at line 97 of file qmemoryvideobuffer.cpp.

{
    return d_func()->mapMode;
}

unmap()

void QMemoryVideoBuffer::unmap ( )

virtual

Reimplemented Function

Implements QAbstractVideoBuffer.

Definition at line 127 of file qmemoryvideobuffer.cpp.

{
    d_func()->mapMode = NotMapped;
}

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The documentation for this class was generated from the following files:

• /src/multimedia/video/qmemoryvideobuffer_p.h
• /src/multimedia/video/qmemoryvideobuffer.cpp