Audio Queue Services Programming Guide.pdf

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1、AudioQueueServicesProgrammingGuideContentsIntroduction6WhatIsAudioQueueServices?6WhoShouldReadThisGuide?7OrganizationofThisDocument7SeeAlso7AboutAudioQueues9WhatIsanAudioQueue?9AudioQueueArchitecture9AudioQueueBuffers11TheBufferQueueandEnqueuing12TheAudioQueueCallbackFunction16U

2、singCodecsandAudioDataFormats18AudioQueueControlandState20AudioQueueParameters21RecordingAudio23DefineaCustomStructuretoManageState23WriteaRecordingAudioQueueCallback25TheRecordingAudioQueueCallbackDeclaration25WritinganAudioQueueBuffertoDisk26EnqueuinganAudioQueueBuffer27AFullR

3、ecordingAudioQueueCallback27WriteaFunctiontoDeriveRecordingAudioQueueBufferSize29SetaMagicCookieforanAudioFile31SetUpanAudioFormatforRecording32CreateaRecordingAudioQueue34CreatingaRecordingAudioQueue34GettingtheFullAudioFormatfromanAudioQueue35CreateanAudioFile36SetanAudioQueue

4、BufferSize37PrepareaSetofAudioQueueBuffers38RecordAudio39CleanUpAfterRecording402010-07-09

5、Copyright©2010AppleInc.AllRightsReserved.2ContentsPlayingAudio41DefineaCustomStructuretoManageState41WriteaPlaybackAudioQueueCallback43ThePlaybackAudioQueueCallbackDeclaration43ReadingFrom

6、aFileintoanAudioQueueBuffer44EnqueuinganAudioQueueBuffer44StoppinganAudioQueue45AFullPlaybackAudioQueueCallback46WriteaFunctiontoDerivePlaybackAudioQueueBufferSize47OpenanAudioFileforPlayback49ObtainingaCFURLObjectforanAudioFile49OpeninganAudioFile50ObtainingaFile’sAudioDataForm

7、at51CreateaPlaybackAudioQueue52SetSizesforaPlaybackAudioQueue53SettingBufferSizeandNumberofPacketstoRead53AllocatingMemoryforaPacketDescriptionsArray54SetaMagicCookieforaPlaybackAudioQueue55AllocateandPrimeAudioQueueBuffers57SetanAudioQueue’sPlaybackGain59StartandRunanAudioQueue

8、59CleanUpAfterPlaying61DocumentRevisionHistory622010-07-09

9、Copyright©2010AppleInc.AllRightsReserved.3FiguresandListingsAboutAudioQueues9Figure1-1Arecordingaudioqueue10Figure1-2Aplaybackaudioqueue11Figure1-3Therecordingprocess13Figure1-4Theplaybackprocess15Figure1-5Audioformatcon

10、versionduringrecording19Figure1-6Audioformatcon