Quicktime File Format (2012-08-14).pdf

GlossaryPCM Pulse-code modulation (PCM) is a methodused to digitally represent sampled analog signals(typically audio related in QuickTime references). Seealso LPCM.QT atom A QuickTime atom that contains otheratoms, possibly including other QT atoms and classicatoms. A data reference atom is an example of a QTatom. Compare classic atom.QTMA (QuickTime Music Architecture) The partof QuickTime that lets other code create andmanipulate music tracks in movies.QTVR track A track in a QuickTime movie thatmaintains a list of VR nodes.QuickDraw The original Mac OS two-dimensionaldrawing software, used by QuickTime.QuickTime A set of Macintosh system extensionsor a Windows dynamic-link library that other codecan use to create and manipulate time-based data.QuickTime VR A QuickTime media type that letsusers interactively explore and examinephotorealistic three-dimensional virtual worlds.QuickTime VR data structures are also calledpanoramas.rate A value that specifies the pace at which timepasses for a time base. A time base’s rate ismultiplied by the time scale to obtain the numberof time units that pass per second. For example,consider a time base that operates in a timecoordinate system that has a time scale of 60. If thattime base has a rate of 1, 60 time units are processedper second. If the rate is set to 1/2, 30 time units passper second. If the rate is 2, 120 time units pass persecond. See also time base and time unit.resource In Macintosh programming, an entity ina file or in memory that may contain executable codeor a description of a user interface item. Resourcesare loaded as needed by a resource manager, andare identified by their type and ID number.resource fork In a legacy Macintosh file, the sectionthat contains resources. The use of the resource forkfor storage of QuickTime media is deprecated in theQuickTime file format.root atom The largest atom container in a hierarchy,with atom type 'sean'.sample A single element of a sequence oftime-ordered data.sample format The format of data samples in atrack, such as a sprite track.sample number A number that identifies thesample with data for a specified time.SECAM (Systeme Electronique Couleur avecMemoire) Sequential Color With Memory; refers toa color-encoding system in which the red and bluecolor-difference information is transmitted onalternate lines, requiring a one-line memory in orderto decode green information.skip atom An atom of type 'skip', which you caninclude in a QuickTime file as a placeholder forunused space.SMPTE Acronym for Society of Motion Picture andTelevision Engineers, an organization that sets videoand movie technical standards.sound track The audio for a QuickTime file, whichis stored in a track with a media handler type of'soun'.2012-08-14 | © 2004, 2012 Apple Inc. All Rights Reserved.442