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Media SDK dispatcher for Windows

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Nikita Pletnev edited this page Apr 1, 2020 · 1 revision

Dispatcher overview

Intel Media SDK dispatcher is a static library, a part of Media SDK package. The application must link the dispatcher during build time. At runtime, when the application initializes a session, the dispatcher locates an appropriate implementation of runtime library and redirects there subsequent Media SDK API function calls.

dispatcher overview

Dispatcher is distributed through:

  • Developer’s releases: pre-compiled library (Release configuration only) + source code
  • Media SDK GitHub repository: source code

How to build

For general build steps and requirements for Windows projects please refer Build Media SDK on Windows.
Dispatcher projects are located in “MediaSDK\api\mfx_dispatch\windows\”. Use AllBuild.sln.

  • libmfx_vs2015 is a project for dispatcher to link with desktop Windows applications. libmfx_vs2015.lib is intended to be used when the application is built via Visual Studio 2015 and higher.
  • libmfx_uwp is a dispatcher project for Universal Windows Platform applications.

Dispatching process

Media SDK dispatcher checks Intel Graphics driver install destinations for the most appropriate Media SDK runtime library to load. Additionally dispatcher checks:

  1. The directory where the current module (module that is linked with dispatcher) is located (only if the current module is a dll)
  2. The directory of the executable file of the current process (looks for software Media SDK implementation only)
  3. Default dll search, refer Dynamic-Link Library Search Order.

Dispatcher for UWP applications checks only UWP-compliant install destinations (Driver Store).
Dispatcher for UWP supports Media SDK hardware implementation only. Software implementation and plugins are not supported.

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