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Multimedia Systems[多媒体系统](PPT-46).ppt

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MultimediaSystemsCS-pressionandbandwidthProcessorschedulingFile,disk,workmanagement Tanenbaum,Chapter7Silbershatz,Chapter20Whatdowemeanby“multimedia”putersystemCD’s&DVD’sComputerharddriveLivebroadcast&webcastsWebcams,Skype,…VideoondemandPause,fastforward,reverse,-wayaudioTeleconferencingInteractivegaming…Requirements“Smooth”audioandvideoDeteriorationinquality>>jerkyplaybackNote:humanismoresensitivetojitterinaudiothantojitterinvideo!Audio/videoonPC’sdoingsomethingelseMultipleconcurrentstreamsVideo&multimediaserversTiVo,:Datapathsforaudio/putationaldatapathsModernFastsystembus,CPU,devicesVideoserverDiskfarmandmultiplestreamsaudiostreamCD-anization(simple)SeparatedatapathforaudiostreamMainsystembusandCPUweretoobusy/slowtohandlereal-timeaudioCPUMemorymemorybusDeviceSoundcardvideostreamviaISA&bridgetographicscardaudiostreamviaISAbridgetoanization(typicalPentium)ISAbridgeIDEdiskMainMemoryCPULevel2cacheBridgeMoni-torGraphicscardUSBKey-boardMouseEther-netSCSIModemSoundcardPrinterPCIbusISAbusAGPPortVideoServerMultipleCPUsDiskfarm1000sofdisksMultiplehigh-pression?–CD-qualityaudio22,050Hz44,100samples/sec16bitspersampleTwochannels176,000bytes/sec (speed)oriPod(space)!MP-3(10:1)pressionratiovarieswithtypeofmusic

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