Transform filters may be better known to you as codecs - compression-decompression. Although the filters may step into each others' territory at times, There are three basic kinds: source filters for input, transform filters for any intermediate processing This processing is accomplished through software modules that DirectShow calls Filters of which To enhance or otherwise modify the original input. Original sound will be rendered correctly.Ĭompression is really just a necessary evil to 'fit' the data for a given length of audio or video into an acceptableĪmount of bandwidth or storage space but media can be processed in an almost unlimited number of ways The 'inverse' of the same formula (Algorithm) is used further along the stream to de-compress the data, the Represent several samples which have been combined using a specific mathematical formula. Instead of samples representing the actual audio amplitude, compressed audio uses data to

Recorded and played back (rendered) at 44.1 kHz. For example, CD quality audio uses 16-bits to represent each sample and the samples are The number of samples taken in a given period depends on the required audio Programmer is able to ensure the data stream is processed correctly and is displayed (rendered)Īudio streams consist of sequences of samples each representing the amplitude of the sound at a By choosing the correct software 'modules', the Represent the original images in compressed form. Video streams are either a sequence of uncompressed RGB bitmaps or a set of numerical values that generally the soundcard, the video monitor or a file. Streams on their passage from the input device - webcam, capture card, etc - to the output device

Treated as data 'streams' and software 'modules' are able to control and interact with these The versatility of DirectShow is due, in part, to its modular approach. DirectShow canĪlso be used to play media files and, in the DirectShow model, the media file is simply treated like This article is translated to Serbo-Croatian language by Jovana Milutinovich from .ĭirectShow is a Microsoft Windows Application Programming Interface (API) that enables WindowsĪpplications to interact with and control Windows 'Media' input devices such asĬamcorders, webcams, DVD drives, TV Tuner cards and Analogue Video capture cards.

Directshow video