Microsoft supports both software and hardware decrypters by way of the DVD navigator/splitter, which oversees the authentication sequence between the decoders and the DVD-ROM drives in a computer. For software decoders, the accelerated graphics port (AGP) bus can be used to transfer the decoded video to the VGA.Ĭopyright protection for DVD is provided by encrypting sectors on a disc and then decrypting those sectors before decoding them. Microsoft provides software support for these interfaces by using the DirectDraw hardware abstraction layer (HAL) with video port extensions (VPE) to pass video that was decoded in hardware to the video graphics array (VGA). These filters enable playback of video using hardware video ports, and provide support for blending low-bandwidth video streams, such as the closed caption decoder output stream.ĭedicated buses transfer decoded video streams from an MPEG-2 decoder to the display card. This filter converts closed-caption data in a DVD video stream into text images.ĭirectShow Video Port Manager and Rendering Filters This filter supports plug-ins that allow expansion for new interfaces.ĭirectShow Closed-Caption Decoding Filter It creates (that is, instantiates) a device object for each data type to be decoded in hardware, such as audio and video data types. This filter converts DirectShow interfaces to WDM connection and streaming architecture properties. The filter responds to commands in the stream and handles all user input. This filter reads the DVD stream directly from a DVD disc and produces individual media type outputs, such as audio, video, and subpicture.

The DVD navigator/splitter filter interprets the programming language embedded in DVD movies, parental control, multiple languages, and processes most DVD-specific data structures. This installable file system supports UDF-formatted DVD discs.ĭirectShow filters and related support include a DVD navigator/splitter, proxy filters for interfacing with the hardware decoder minidrivers for video, subpicture and audio streams, line21 decoder (closed caption), a video mixer, video renderer, and an audio renderer. NT-based operating systems provide a UDF-installable file system, similar to FAT and NTFS. This class driver provides the ability to read data sectors from a DVD-ROM drive. Support for the DVD-ROM command set, including commands for copyright protection and regionalization, is provided in Windows XP by an updated CD-ROM class driver.

Vendors must supply either a DirectShow-compatible software decoder for each required DVD data stream, or provide a WDM streaming-compatible DVD decoder minidriver to support their DVD hardware decoders. Microsoft does not provide MPEG-2 or AC-3 software/hardware decoder filters with Windows XP.

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