QGstVideoBuffer Class Reference

#include <qgstvideobuffer_p.h>

Inheritance diagram for QGstVideoBuffer:

Collaboration diagram for QGstVideoBuffer:

Public Member Functions
	QGstVideoBuffer (QGstBufferHandle buffer, const GstVideoInfo &info, QGstreamerVideoSink *sink, const QVideoFrameFormat &frameFormat, QGstCaps::MemoryFormat format)
	~QGstVideoBuffer () override
MapData	map (QVideoFrame::MapMode mode) override
	Maps the planes of a video buffer to memory.
void	unmap () override
	Releases the memory mapped by the map() function.
bool	isDmaBuf () const override
QVideoFrameTexturesUPtr	mapTextures (QRhi &, QVideoFrameTexturesUPtr &) override
Public Member Functions inherited from QHwVideoBuffer
	QHwVideoBuffer (QVideoFrame::HandleType type, QRhi *rhi=nullptr)
	~QHwVideoBuffer () override
QVideoFrame::HandleType	handleType () const
virtual QRhi *	rhi () const
QVideoFrameFormat	format () const override
	Gets \l QVideoFrameFormat of the underlying video buffer.
virtual QMatrix4x4	externalTextureMatrix () const
virtual void	initTextureConverter (QRhi &)
Public Member Functions inherited from QAbstractVideoBuffer
virtual	~QAbstractVideoBuffer ()
	\variable QAbstractVideoBuffer::MapData::planeCount
Public Member Functions inherited from QVideoFrameTexturesHandles
virtual	~QVideoFrameTexturesHandles ()
virtual quint64	textureHandle (QRhi &, int)

Additional Inherited Members
Protected Attributes inherited from QHwVideoBuffer
QVideoFrame::HandleType	m_type
QRhi *	m_rhi = nullptr

Detailed Description

Definition at line 29 of file qgstvideobuffer_p.h.

Constructor & Destructor Documentation

QGstVideoBuffer()

QGstVideoBuffer::QGstVideoBuffer	(	QGstBufferHandle	buffer,
		const GstVideoInfo &	info,
		QGstreamerVideoSink *	sink,
		const QVideoFrameFormat &	frameFormat,
		QGstCaps::MemoryFormat	format )

Definition at line 43 of file qgstvideobuffer.cpp.

References QGstVideoBuffer().

Referenced by QGstVideoBuffer().

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~QGstVideoBuffer()

QGstVideoBuffer::~QGstVideoBuffer ( )

override

Definition at line 66 of file qgstvideobuffer.cpp.

Member Function Documentation

isDmaBuf()

bool QGstVideoBuffer::isDmaBuf ( ) const

overridevirtual

Reimplemented from QHwVideoBuffer.

Definition at line 114 of file qgstvideobuffer.cpp.

References QGstCaps::DMABuf.

map()

QAbstractVideoBuffer::MapData QGstVideoBuffer::map ( QVideoFrame::MapMode mode )

overridevirtual

Maps the planes of a video buffer to memory.

Returns a \l MapData structure that contains information about the plane layout of the mapped current video data. If the mapping fails, the method returns the default structure. For CPU memory buffers, the data is considered as already mapped, so the function just returns the plane layout of the preallocated underlying data.

The map mode indicates whether the contents of the mapped memory should be read from and/or written to the buffer. If the map mode includes the QVideoFrame::ReadOnly flag the mapped memory will be populated with the content of the buffer when initially mapped. If the map mode includes the QVideoFrame::WriteOnly flag the content of the possibly modified mapped memory will be written back to the buffer when unmapped.

When access to the data is no longer needed, the \l unmap function is called to release the mapped memory and possibly update the buffer contents.

If the format of the video data is multiplanar, the method may map the whole pixel data as a single plane. In this case, mapping a buffer with \l QVideoFrame will calculate additional planes from the specified line stride of the first plane, the frame height, and the data size.

Implements QAbstractVideoBuffer.

Definition at line 71 of file qgstvideobuffer.cpp.

mapTextures()

QVideoFrameTexturesUPtr QGstVideoBuffer::mapTextures ( QRhi & rhi, QVideoFrameTexturesUPtr &  )

overridevirtual

Reimplemented from QHwVideoBuffer.

Definition at line 466 of file qgstvideobuffer.cpp.

unmap()

void QGstVideoBuffer::unmap ( )

overridevirtual

Releases the memory mapped by the map() function.

If the \l {QVideoFrame::MapMode}{MapMode} included the QVideoFrame::WriteOnly flag this will write the current content of the mapped memory back to the video frame.

For CPU video buffers, the function may be not overridden. The default implementation of unmap does nothing.

See also

map()

Reimplemented from QAbstractVideoBuffer.

Definition at line 103 of file qgstvideobuffer.cpp.

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

• qtmultimedia/src/plugins/multimedia/gstreamer/common/qgstvideobuffer_p.h (0b48eb12dcfd686196fb181c72676f564b037ddc)
• qtmultimedia/src/plugins/multimedia/gstreamer/common/qgstvideobuffer.cpp (0b48eb12dcfd686196fb181c72676f564b037ddc)