IBuffer Interface

Single CVB buffer. More...

Typedefs
typedef void *	CVBUFFER
	CVB buffer handle. More...

Functions
cvbres_t	CVCBufferGetBasePtr (CVBUFFER hBuffer, void *&pBase)
	Gets the pointer to the first element in the hBuffer object's memory. More...
cvbres_t	CVCBufferGetCapacity (CVBUFFER hBuffer, size_t &Capacity)
	Gets the number of allocated bytes in the given hBuffer. More...
cvbres_t	CVCBufferGetSize (CVBUFFER hBuffer, size_t &Size)
	Gets the size of the given hBuffer in bytes. More...
cvbbool_t	CVCIsBuffer (CVBUFFER hBuffer)
	Tests whether this a CVB buffer or PFNC buffer. More...

Detailed Description

Single CVB buffer.

A buffer is simply a contiguous block of memory.

The valid block of the buffer is defined by its starting point given by the BasePtr and its Size. The Capacity might differ from Size and denotes the actual allocated chunk of memory. Size might be smaller if e.g. a camera sends variable image sizes.

Attention

One logical CVB image (IImageVPA) can consist of several buffers (e.g. one buffer per plane).

Typedef Documentation

CVBUFFER

CVBUFFER

CVB buffer handle.

The CVBUFFER is a reference counted OBJ handle. CVBUFFER objects at least provide the IBuffer or IPFNCBuffer interface.

Function Documentation

CVCBufferGetBasePtr()

cvbres_t CVCBufferGetBasePtr	(	CVBUFFER	hBuffer,
		void *&	pBase
	)

Gets the pointer to the first element in the hBuffer object's memory.

Parameters

[in]	hBuffer	Buffer handle to query.
[out]	pBase	Variable to receive the base pointer of the buffer.

Returns

• #CVC_ERROR (#CVC_E_OK) on success.
• #CVC_ERROR (#CVC_E_WRONGOBJECT) if hBuffer is not an CVBUFFER.

CVCBufferGetCapacity()

cvbres_t CVCBufferGetCapacity	(	CVBUFFER	hBuffer,
		size_t &	Capacity
	)

Gets the number of allocated bytes in the given hBuffer.

Attention

This value denotes the allocated bytes, not necessarily the valid ones. For the valid number of bytes see CVCBufferGetSize(CVBUFFER, size_t &).

Parameters

[in]	hBuffer	Buffer handle to query.
[out]	Capacity	Variable to receive the number of allocated bytes.

Returns

• #CVC_ERROR (#CVC_E_OK) on success.
• #CVC_ERROR (#CVC_E_WRONGOBJECT) if hBuffer is not an CVBUFFER.

CVCBufferGetSize()

cvbres_t CVCBufferGetSize	(	CVBUFFER	hBuffer,
		size_t &	Size
	)

Gets the size of the given hBuffer in bytes.

This value denotes the actually valid number of bytes starting from CVCBufferGetBasePtr(CVBUFFER, void * &). For the allocated size see CVCBufferGetCapacity(CVBUFFER, size_t &).

Parameters

[in]	hBuffer	Buffer handle to query.
[out]	Size	Variable to receive the number of valid bytes in the hBuffer.

Returns

• #CVC_ERROR (#CVC_E_OK) on success.
• #CVC_ERROR (#CVC_E_WRONGOBJECT) if hBuffer is not an CVBUFFER.

CVCIsBuffer()

cvbbool_t CVCIsBuffer

(

CVBUFFER

hBuffer

)

Tests whether this a CVB buffer or PFNC buffer.

A buffer is a congruent chunk of memory.

If you need to test whether the given hBuffer is of the more specialized PFNC buffer type call CVCIsPfncBuffer(CVBUFFER).

Parameters

[in]

hBuffer

Buffer handle to check.

Returns

true if hBuffer is any CVB buffer; false if not.