OpenCV: Intel VA-API/OpenCL (CL-VA) interoperability

| OpenCV 3.4.2 Open Source Computer Vision

Namespaces | Functions
Intel VA-API/OpenCL (CL-VA) interoperability
Core functionality

## Namespaces
| cv::va_intel::ocl

## Functions
void | cv::va_intel::convertFromVASurface (VADisplay display, VASurfaceID surface, Size size, OutputArray dst)
| Converts VASurfaceID object to OutputArray. More...
void | cv::va_intel::convertToVASurface (VADisplay display, InputArray src, VASurfaceID surface, Size size)
| Converts InputArray to VASurfaceID object. More...

## Detailed Description

This section describes Intel VA-API/OpenCL (CL-VA) interoperability.

To enable CL-VA interoperability support, configure OpenCV using CMake with WITH_VA_INTEL=ON . Currently VA-API is supported on Linux only. You should also install Intel Media Server Studio (MSS) to use this feature. You may have to specify the path(s) to MSS components for cmake in environment variables: VA_INTEL_MSDK_ROOT for Media SDK (default is "/opt/intel/mediasdk"), and VA_INTEL_IOCL_ROOT for Intel OpenCL (default is "/opt/intel/opencl").

To use CL-VA interoperability you should first create VADisplay (libva), and then call initializeContextFromVA() function to create OpenCL context and set up interoperability.

## Function Documentation

## ◆ convertFromVASurface()

void cv::va_intel::convertFromVASurface | ( | VADisplay | display,
|  | VASurfaceID | surface,
|  | Size | size,
|  | OutputArray | dst
| ) |  |

Converts VASurfaceID object to OutputArray.

Parameters

  display | - VADisplay object.
  surface | - source VASurfaceID object.
  size | - size of image represented by VASurfaceID object.
  dst | - destination OutputArray.

## ◆ convertToVASurface()

void cv::va_intel::convertToVASurface | ( | VADisplay | display,
|  | InputArray | src,
|  | VASurfaceID | surface,
|  | Size | size
| ) |  |

Converts InputArray to VASurfaceID object.

Parameters

  display | - VADisplay object.
  src | - source InputArray.
  surface | - destination VASurfaceID object.
  size | - size of image represented by VASurfaceID object.