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Encyclopedia > DirectX Media Objects

DirectX Media Objects (DMOs) are COM-based multimedia and data-streaming components. In some respects, DMOs are similar to DirectShow filters. Like DirectShow filters, DMOs take input data and use it to produce output data. As the APIs for DMOs are much simpler than the corresponding APIs for DirectShow, they are easier to create, test, and use. For encoding/decoding, audio capture, audio processing and video processing effects, Microsoft encourages developers to write a DMO instead of a DirectShow filter. DMOs can be used in many scenarios: Component Object Model (COM) is a platform for software componentry introduced by Microsoft in 1993. ... Logo of the DirectX Media SDK - the first time DirectShow was distributed under its current name. ... Microsoft Corporation, (NASDAQ: MSFT, HKSE: 4338) is a multinational computer technology corporation with global annual revenue of US$44. ...

  • Applications based on DirectShow can use DMOs through a DirectShow filter called the DMO Wrapper filter. The distinction between filters and DMOs is transparent to the application. The application does not directly call the DMO APIs.
  • Applications based on DirectSound can use audio effect DMOs. Again, the application is shielded from the low-level DMO APIs by the higher-level DirectSound APIs.
  • Applications can also use DMOs directly, such as DMOs for video effects, audio capture effects etc.
  • The Windows Media SDK and ASF framework support DMO-based codecs. The codecs shipping as part of Windows Media Player/Encoder are not DirectShow filters but DMOs. Through the DMO wrapper filter, they are usable in DirectShow.

Windows Media-based software encoders from Microsoft use DMO-based codecs through encoder profiles. Windows Movie Maker can also use encoder profiles. Only Microsoft tools use DMOs. Third party DMO codecs are very rare or almost non-existent, unlike Video for Windows, ACM or DirectShow codecs. The Leadtools, for example, install DMO-based H.264 codecs. Using the Windows Media Profile Editor (part of Encoder 9 Series), an encoder profile which uses such third party codecs instead of the Windows Media codecs can be created. Then, Windows Media Encoder and Windows Movie Maker would be able to export WMV/ASF files with non-Microsoft codecs. DirectSound is software supplied by Microsoft that resides on a computer with the Windows operating system. ... Windows Media is a multimedia framework for media creation and distribution for Microsoft Windows. ... Advanced Systems Format (formerly Advanced Streaming Format) is Microsofts proprietary digital audio/digital video container format, especially meant for streaming media. ... Windows Media is a multimedia framework for media creation and distribution for Microsoft Windows. ... “Movie maker” redirects here. ... Video for Windows was a multimedia technology developed by Microsoft that allowed Microsoft Windows to play digital video. ... Audio Compression Manager is the Windows Multimedia software component that manages audio codecs (compressor/decompressors). ... Logo of the DirectX Media SDK - the first time DirectShow was distributed under its current name. ... H.264 is a high compression digital video codec standard written by the ITU-T Video Coding Experts Group (VCEG) together with the ISO/IEC Moving Picture Experts Group (MPEG) as the product of a collective partnership effort known as the Joint Video Team (JVT). ... Codec is a portmanteau of coder/decoder, which describes a device or program capable of performing transformations on a data stream or signal. ... Windows Media Video (WMV) is a generic name for the set of video codec technologies developed by Microsoft. ...

Media Foundation Transforms (MFTs) have replaced DMOs as developers transition from DirectShow to Media Foundation. Microsoft Media Foundation (MF) is a COM-based multimedia framework pipeline and infrastructure platform for digital media in Windows Vista and not Windows XP and earlier versions. ...

See also

  Results from FactBites:
DirectX - Wikipedia, the free encyclopedia (1983 words)
The various components of DirectX are in the form of COM-compliant objects.
As of DirectX 9.0c, however, neither XInput nor XACT have all of the capabilities of DirectInput or DirectSound, and according to MS documentation on XInput, XInput is specifically designed for the Xbox 360 controllers.
DirectX is, however, still required to build the DirectShow samples [1].
DirectX (404 words)
DirectX was developed internally at Microsoft around 1994-1995 as a follow-up and improvement to the game API subset called WinG[?] for the Win16 operating systems.
DirectX was primarily by the team of Alex St. John[?], Craig Eisler, and Eric Engstrom.
When DirectX was first being created in the 1990s, Microsoft had already started including OpenGL on their Windows NT platform.
  More results at FactBites »



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