The generic nature of this connection mechanism enables filters to be connected in various ways so as to implement different complex functions. Each filter – which represents one stage in the processing of the data – has input and/or output pins that may be used to connect the filter to other filters. video playback) into a sequence of fundamental processing steps known as filters. Architecture ĭirectShow divides a complex multimedia task (e.g. It includes several new enhancements, codecs and filter updates such as the Enhanced Video Renderer (EVR) and DXVA 2.0 ( DirectX Video Acceleration).
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Since November 2007, DirectShow APIs are part of the Windows SDK. The DirectX SDK was, however, still required to build some of the DirectShow samples. In April 2005, DirectShow was removed entirely from DirectX and moved to the Windows SDK starting with the Windows Server 2003 SP1 version of the SDK. In October 2004, DirectShow was removed from the main DirectX distribution and relocated to the DirectX Extras download. In DirectX version 8.0, DirectShow became part of the core DirectX SDK along with other DirectX APIs. DirectShow became a standard component of all Windows operating systems starting with Windows 98 however it is available on Windows 95 by installing the latest available DirectX redistributable. In March 1997, Microsoft announced that ActiveMovie would become part of the DirectX 5 suite of technologies, and around July started referring to it as DirectShow, reflecting Microsoft's efforts at the time to consolidate technologies that worked directly with hardware under a common naming scheme. The project was initially named "ActiveMovie", and was released in May 1996, bundled with the beta version of Internet Explorer 3.0. Clockwork haad previously been used in the Microsoft Interactive Television project.
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The development team used a pre-existing modular digital-media-processor project codenamed "Clockwork" as a basis for DirectShow. It was also intended as a future replacement for media processing frameworks like Video for Windows and the Media Control Interface, which had never been fully ported to a 32-bit environment and did not utilize COM.
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The direct predecessor of DirectShow, ActiveMovie (codenamed Quartz), was designed to provide MPEG-1 support for Windows.
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As described in the Media Foundation article, Windows Vista and Windows 7 applications use Media Foundation instead of DirectShow for several media related tasks. And there are still DirectShow features that aren't (yet) in Media Foundation". Microsoft's Becky Weiss also confirms that "you'll notice that working with the Media Foundation requires you to work at a slightly lower level than working with DirectShow would have.
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One reason cited by Microsoft is to provide "much more robust support for content protection systems" (see digital rights management). Microsoft plans to completely replace DirectShow gradually with Media Foundation in future Windows versions. Currently, they are distributed as part of the Windows SDK (formerly known as the Platform SDK). The DirectShow development tools and documentation were originally distributed as part of the DirectX SDK. Based on the Microsoft Windows Component Object Model (COM) framework, DirectShow provides a common interface for media across various programming languages, and is an extensible, filter-based framework that can render or record media files on demand at the request of the user or developer. It is the replacement for Microsoft's earlier Video for Windows technology.
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com /en-us /windows /win32 /directshow /directshowĭirectShow (sometimes abbreviated as DS or DShow), codename Quartz, is a multimedia framework and API produced by Microsoft for software developers to perform various operations with media files or streams. Logo of the DirectX Media SDK – the first time DirectShow was distributed under its current name.