View Aimcat from ELECTRONIC EE at Delhi Technological University. 2 of Time aimcat Provide me with the package information related to AIMCAT Package for CAT ?. To address this, we will be conducting the AIMCATs & again during the CAT window. This change has been made to enable you to schedule your.
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Sign Up Sign In. Remarks This property offers a way for appiications to set the owner of the video window.
AIMCAT 1201 (please do not open if you have not taken the test yet)
This is often used when aicmat videos in compound documents. Q Microsoft Corporation. Focus Long vaiue that specifies whether the video window will have focus. A value of —1 gives the window focus and 0 does not. ActiveMovie Control Page of Sets the position of the video window not the client rectangle position in device coordinates.
Left Specifies the x—axis origin of the window. Top Specifies the y—axis origin of the window. Wicith Specifies the width of the window. Height Specifies the height of the window. Remarks Specify, in window coordinates, where the video should appear. For exampie, setting a destination of ,SO, positions the video piayback at an origin of pixels from the ieft of the client area, 50 pixeis from the top, and with an overall size of x pixels.
Simiiariy, if the video is larger than the destination rectangle, the video is compressed into the visibie aimvat. There are fairly severe performance penaities if an appiication does not keep the source and destination rectangies the same size. Under typical circumstances, when no destination rectangle has been set, the video fiiis the entire visiple ciient window area regardiess of how much the user has stretched the window.
Also, the destination rectangie properties correctly return the size of the video window client area. This method has the same effect as individnaiiy setting the Left, lop, Width, and Height properties. ActiveMovie Control Page of oijideoWindow.
Remarks Caiiing this method does not affect the height of the video window. Remarks The Width property is independent of the video window’s Height property the x-coordinate. DirectShow Basics Page 1 of aumcat DirectShow Basics This section contains articles covering basic DirectShow concepts, such as filter graph architecture and data flow, how to use the Filter Graph Editor tooi, and a list of the fiiters and sample filters supplied with DirectShow.
You can use this ximcat as a high-ievei introduction to DirectShow.
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You need only a general understanding of programming and media to understand the topics in this section. You can also use the set of media streaming interfaces to stream media data without creating fiiters. The DirectShow run time is a controi.
The video and audio capture capabiiity iets you programmaticaiiy controi your system’s video and audio capture hardware, as weii as video and audio compressors and decompressors codecs. The Piug and Piay capabiiity iets Aimca automatically retrieve and use your fiiters, once you register their properties.
However, libraries will continue to be avaiiabie and supported for appiications that use the earlier Microsoft multimedia playback services, such as Microsoft Video for Windows. Contents of this article: The fiiters have input or output pins, or both, and are connected to each other in a configuration called a filter graph.
Applications use an object caiied the fifter graph manager to assemble the fiiter graph and move data through it. By default, the filter graph manager automaticaiiy handies data fiow for you; for example, it automaticaiiy inserts the proper codec if needed, and aimat automatically connects a transform filter’s output pin to the default rendering filter. You can aiways specify your own fiiters and connections if you don’t want to use the default configuration.
The filter graph manager provides a set of Component Object Modei COM interfaces so that appiications can access the filter graph.
Applications can directiy caii the 101 graph manager interfaces to control the media stream or retrieve fiiter events, or they can use the ActiveMovie Control to piay back media files. Chewing the Right Fragrammirig Model thireotShow ia aooeaaihie at aeyerai ieyeia, and the aaaroaoh you uae deeehda oh what you need ahd how much erodrammihd you waht to do.
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C or C-i- i- erodrammera can write iiitera that change or enhance muitimedia data aiready mahaded hy exiatiho fiiter graeha. Your choice deeehda oh the aeryioea the aeeiieatioh uaea and your ooaia. Eh the majority of eaaea, thia wiii he a atraightforward uedrade that maihtaiha hut eiaytiaei: DirectShow Ximcat Page 4 of 62 graph manager. If your application must process the media stream in some way or capture a media stream, you can incorporate both the filter graph manager and a custom filter into your application.
The instantiated filter graph manager generates and manages the filter graph. You can insert the custom filter into a preconfigured filter graph which you create and save by using the Filter Graph Editor tool in the DirectShow SDK.
You also could insert the filter into an existing filter graph at run time. Realmtime playback means that the ActiveMovie Control can play video or audio files over the Internet while the file is downloading, rather than requiring the user to wait until the whole file is downloaded to begin playback.
The same filter graphs constructed to play media from files can play media from the Internet by simply changing the source filter. Take, for example, a filter graph that plays MPEG movies from a disk file. The first filter in the graph might be a file reader filter. Both file and URL reader source filters just deliver an unparsed stream of data. A parser filter pulls the data from the reader, parses it into separate streams of video, audio, text, or other data types, and pushes it downstream.
This filter remains unchanged regardless aimca whether the source filter is a file or URL reader filter. DirectShow provides this as a built—in filter. It knows how to read, but not parse, data from a URL address. Other media types have their own parser 12201 for example, a QuickTime parser.
The source filter that reads from files is the File Source Async filter. DirectShow also provides this as a built-in filter. It does no parsing on its own but simply reads data off a disk to play back. Most DirectShow filter graphs use this source filter. The architecture’s modularity allows most of the same components to be reused between file and Internet playback.
This modularity also means that if you want to render a aimcaf type of data, often you only need to write a parser and renderer, and you can still use the existing file or URL filter. However, it ia uaefui to uhdeiatahd at ieaat the baaic arihciaiea of fitter graaha if vou ever waht to configure vour owh fiiter graoh rather thah iettihg the fiiter graah rnahager configure them for you.
Moat fiitera can he categorized into ohe of the foiiowihg three tveea. Eh add itioh to theae three tvoea, there are other hihda of fiitera, for examaie, effect fiitera, which add effecta without chahgihg the data tvae, ahd garaer fiitera, which uhderatahd the format of the aource data ahd ithow how to read the correct avtea, create tiroea atafooa; ahd gerforrh aeeita.
An audio rehderer fiiter to aehd the audio to the aouhd card. But tvoicaiiv, fiitera fit ohiv one of theae three tvaea. Fiiter giaaha atrearh rhuitirhedia data through fiitera.
DirectShcw Easics Page 6 cf 62 media dawnaaeam td the next fitter. Fitter grahha can atac he hreccnftg tired, in which caae the fitter aaimcat manager dcea nct need to aearch fcr a cc nfig hraticn. When aearchtng fdr a rendering cdnftgttrattcn, the fitter grahh manager haea the fitter mahher, which firat reada the regiatry and determinea the tyhea cf fittera avaitahte.
Contact tc ahecify theae acttvttiea, and then catta the ahhmhrtate methcda an the fittera tc invche them. Fcr each atream it hand tea, it exhcaea at teaat cne gain.
DirectShow Basics Page 7 of 62 the filter graph will not automatically render that pin when an application calls IGraphBuilder: This can apply to pins that are just informational and are not meant to be rendered, or need to be enumerated so that their properties can be ajmcat. Note that intelligent connect can still be used to connect pins with this property if they implement the IPin: However, output pins of intermediate filters which are being used to complete the connection which have the tilde at the start of their name will not be connected as part of the intelligent connection attempt.
At a minimum, a filter exposes the EBaseFilter interface. This interface provides methods that allow the enumeration of the pins on the filter and return filter aimmcat. In addition, a filter might expose several other interfaces, depending on the media types supported and tasks performed.
For example, a filter can expose the E if Pr r P interface to support a property page. Pins are responsible for providing interfaces to connect with other pins and for transporting the data. The pin interfaces support the following: Pin interfaces differ slightly, depending on whether they are output pins or input pins. Aimcqt output pin typically exposes the following interfaces. The renderer passes the media aimdat information upstream to the fifter typically the source filter responsibie for queuing the stream to the appropriate position.
An input pin typically exposes the following interfaces. This interface can create a shared memory allocator object if the connected pin does not supply a transport memory allocator. The standard transport interface, IMemEnputPin, provides data transfer through shared memory buffers, although other transport interfaces can be used.
For exampie, where two components are connected directly in hardware, they can connect to each other by using the DirectShow Basics Page 8 of 62 IPin interface, and then seek a private interface that can manage the transfer of data directly between the two components. Aiimcat the stream architecture, fifters can post events that the application can retrieve, so an application can, for example, retrieve status information about a speciai fifter it has installed.
The filter graph manager exposes media control and media positioning interfaces to the appfication.
The media control interface, IMediaControi, allows the application to issue commands to run, pause, and stop the stream. The positioning interface, IMediaSeeking, fets the application specify which section of the stream to play.
Individual filters expose an IBaseFilter interface so that the filter graph manager can issue the run, pause, and stop control commands. The filter graph manager is responsible for calling these methods in the correct order on all the filters in the filter graph. The application should not do this directly. For position commands, the filter graph manager is calied by the appiication to, for exampie, play a specified length of media stream starting at some specified stream time.
However, unlike the iBaseFilter interface, onfy the renderer fifter exposes an iMediaSeeking interface.