Codec's Explained: A codec is a piece of software on either a device or computer capable of encoding and/or decoding video and/or audio data from files, streams and broadcasts. The word Codec is a portmanteau of 'compressor-decompressor' Compression types that you will be able to play include.
Download Digital Video Decoder and Multiplexer Hotfix for DirectX 9.0, 9.0a, and 9.0b (KB831937) from Official Microsoft Download Center.

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Logo of the DirectX Media SDK – the first time DirectShow was distributed under its current name.^{[citation needed]}

DirectShow (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. It is the replacement for Microsoft's earlier Video for Windows technology.^[1] Based on the Microsoft WindowsComponent 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. The DirectShow development tools and documentation were originally distributed as part of the DirectXSDK.^[2] Currently, they are distributed as part of the Windows SDK (formerly known as the Platform SDK).^[3]

Microsoft plans to completely replace DirectShow gradually with Media Foundation in future Windows versions. One reason cited by Microsoft is to provide 'much more robust support for content protection systems'^[4] (see digital rights management). Microsoft's MSFT 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. And there are still DirectShow features that aren't (yet) in Media Foundation'.^[5] As described in the Media Foundation article, Windows Vista and Windows 7 applications use Media Foundation instead of DirectShow for several media related tasks.

6Reception

History[edit]

The direct predecessor of DirectShow, ActiveMovie (codenamed Quartz), was originally chartered to provide MPEG-1 file playback support for Windows.^{[citation needed]} It was also intended as a future replacement for media processing frameworks like Video for Windows, which had never been designed to handle codecs that put video frames into a different order during the compression process, and the Media Control Interface, which had never been fully ported to a 32-bit environment and did not utilize COM.^[1]

The Quartz team started with an existing project called Clockwork.^{[citation needed]} Clockwork was a modular media processing framework in which semi-independent components worked together to process digital media streams, and had previously been used in several projects, including the Microsoft Interactive Television (MITV) project and another project named Tiger.^[6]

ActiveMovie was announced in March 1996, and released in May 1996, bundled with the beta version of Internet Explorer 3.0.^[7]^[8] 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.^[9]^[10]^[11] DirectShow became a standard component of all Windows operating systems starting with Windows 98;^[12] however it is available on Windows 95 by installing the latest available DirectX redistributable.^[13] In DirectX version 8.0, DirectShow became part of the mainline distribution of the DirectX SDK and was placed alongside other DirectX APIs.^[14]

In October 2004, DirectShow was removed from the main DirectX distribution and relocated to the DirectX Extras download.^{[citation needed]} 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.^[3] The DirectX SDK was, however, still required to build some of the DirectShow samples.^[15]

Since November 2007, DirectShow APIs are part of the Windows SDK. It includes several new enhancements, codecs and filter updates such as the Enhanced Video Renderer (EVR) and DXVA 2.0 (DirectX Video Acceleration).^[16]

Architecture[edit]

DirectShow divides a complex multimedia task (e.g. video playback) into a sequence of fundamental processing steps known as filters.^[17]^[18] 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. The generic nature of this connection mechanism enables filters to be connected in various ways so as to implement different complex functions.^[19] To implement a specific complex task, a developer must first build a filter graph by creating instances of the required filters, and then connecting the filters together.^[20]

There are three main types of filters:

Source filters: These provide the source streams of data. For example, reading raw bytes from any media file.
Transform filters: These transform data that is provided from other filter's output. For example, doing a transform such as adding text on top of video or uncompressing an MPEG frame.
Renderer filters: These render the data. For example, sending audio to the sound card, drawing video on the screen or writing data to a file.

During the rendering process, the filter graph searches the Windows Registry for registered filters and builds its graph of filters based on the locations provided. After this, it connects the filters together, and, at the developer's request, executes (i.e., plays, pauses, etc.) the created graph.^{[citation needed]} DirectShow filter graphs are widely used in video playback (in which the filters implement functions such as file parsing, video and audio demultiplexing, decompressing and rendering) as well as for video and audio recording, editing, encoding, transcoding or network transmission of media. Interactive tasks such as DVD navigation may also be controlled by DirectShow.^{[citation needed]}

Filter graph of an mp3 file, as rendered by the DirectShow sample in GraphEdit, an application with a GUI for DirectShow used to visually build and test filter graphs.^[21] In this picture the boxes represent filters and the grey dots appearing on the sides of the filters represent pins.

In the above example, from left to right, the graph contains a source filter to read an MP3 file, stream splitter and decoder filters to parse and decode the audio, and a rendering filter to play the raw audio samples. Each filter has one or more pins that can be used to connect that filter to other filters. Every pin functions either as an output or input source for data to flow from one filter

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