Core Audio Overview

《Core Audio Overview》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、CoreAudioOverviewContentsIntroduction7OrganizationofThisDocument7SeeAlso8WhatIsCoreAudio?9CoreAudioiniOSandOSX9ALittleAboutDigitalAudioandLinearPCM11AudioUnits11TheHardwareAbstractionLayer13MIDISupportinOSX14TheAudioMIDISetupApplication14AMacCoreAudioRecordingStudio15MacDevelopmentUsingt

2、heCoreAudioSDK17CoreAudioEssentials18APIArchitecturalLayers18Frameworks20ProxyObjects20Properties,Scopes,andElements21CallbackFunctions:InteractingwithCoreAudio22AudioDataFormats24UniversalDataTypesinCoreAudio24ObtainingaSoundFile’sDataFormat25CanonicalAudioDataFormats26MagicCookies27Aud

3、ioDataPackets28DataFormatConversion30SoundFiles31CreatingaNewSoundFile32OpeningaSoundFile32ReadingFromandWritingToaSoundFile33ExtendedAudioFileServices33iPhoneAudioFileFormats33CAFFiles342008-11-13

4、Copyright©2008AppleInc.AllRightsReserved.2ContentsSoundStreams34AudioSessions:Cooperatingw

5、ithCoreAudio35AudioSessionDefaultBehavior36Interruptions:DeactivationandActivation37DeterminingifAudioInputisAvailable37UsingYourAudioSession38PlaybackusingtheAVAudioPlayerClass38RecordingandPlaybackusingAudioQueueServices41AudioQueueCallbackFunctionsforRecordingandPlayback41CreatinganAu

6、dioQueueObject42ControllingAudioQueuePlaybackLevel44IndicatingAudioQueuePlaybackLevel45PlayingMultipleSoundsSimultaneously45PlaybackwithPositioningUsingOpenAL46SystemSounds:AlertsandSoundEffects46CoreAudioPlug-ins:AudioUnitsandCodecs48AudioUnits49Codecs50AudioProcessingGraphs52MIDIServic

7、esinOSX54MusicPlayerServicesinOSX57TimingServicesinOSX57CommonTasksinOSX59ReadingandWritingAudioData59ConvertingAudioDataFormats60InterfacingwithHardware61DefaultandSystemI/OUnits61TheAUHALUnit62UsingAggregateDevices63CreatingAudioUnits64HostingAudioUnits65HandlingMIDIData67HandlingAudio

8、andMIDIDataTogether71CoreAudioFrameworks72FrameworksAvailableiniOSandOSX72AudioToolbox.framework72AudioUnit.framework73CoreAudio.framework742008-11-13

9、Copyright©2008AppleInc.AllRightsReserved.3ContentsOpenAL.framework74FrameworksAvailableiniOSOnly75AVFoundation.framework7