Intel Media SDK Library Distribution and Dispatching Process

Intel Media SDK Library Distribution and Dispatching Process
Intel® Media SDK Library Distribution and
Dispatching Process
Overview
Dispatching Procedure
Software Libraries
Platform-Specific Libraries
Legal Information
Overview
This document describes the Intel® Media SDK libraries distribution and dispatching process.
As illustrated in Figure 1, the Intel Media SDK Dispatcher (further abbreviated as the
Dispatcher) is at the core of the Intel® Media SDK architecture, between an application and any
platform-specific libraries. The application must link the Dispatcher, a static library, during build
time.
At runtime, when the application initializes a session, the Dispatcher locates the appropriate
platform-specific library, and redirects subsequent function calls to the same functions in it. If
an appropriate library is not found, the Dispatcher selects the software library and redirects
subsequent function calls to the same functions in the selected library.
Application
SDK API Dispatcher Library
( ENCODE/DECODE/VPP)
SDK Library 1
(CPU Optimized)
SDK Library 2
(Platform 1)
SDK Library 3
(Platform 2)
Figure 1: Intel® Media SDK Library Dispatching Mechanism
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Dispatching Procedure
The following describes the Intel® Media SDK dispatching procedure:
1. If the application initializes a MFX_IMPL_HW or MFX_IMPL_AUTO session, the following
procedure follows:
a. The Dispatcher tries to locate the platform-specific library. If successful, the
dispatching procedure is complete.
b. If the session is a MFX_IMPL_HW session, the session initialization fails. The
Dispatcher returns MFX_ERR_UNSUPPORTED to the application.
2. The Dispatcher tries to locate the software library. If successful, the dispatching
procedure is complete.
3. The session initialization fails. The Dispatcher returns MFX_ERR_UNSUPPORTED to the
application.
The following sections describe different libraries mentioned in the above procedure.
Software Libraries
Intel® Media SDK software libraries are functionally backwards compatible for applications
running on any legacy platforms that do not have the same level of hardware acceleration. The
libraries also function as a CPU workload when the application runs multiple transcoding
sessions.
The software libraries usually reside in the application’s local folder, or any folder that is part of
the OS default library search paths. The Dispatcher locates the software libraries by their
reserved names:
Library Name
Intel® Media SDK Software Implementation
libmfxsw32.dll
Software library for IA-32 architecture
libmfxsw64.dll
Software library for Intel® 64 architecture
The application must package the software libraries as needed in its installation package. If the
application uses only the platform-specific libraries, the application does not have to carry the
software libraries.
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Platform-Specific Libraries
Intel® Media SDK platform-specific libraries implement hardware acceleration on corresponding
platforms. The platform-specific libraries are part of the platform graphic driver package.
Hence, installing the platform graphic driver also installs the platform-specific libraries.
Applications do not need to carry any platform-specific libraries.
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Legal Information
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Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for
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Microprocessor-dependent optimizations in this product are intended for use with Intel
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microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for
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Notice revision #20110804
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