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localnav-scrim" data-sticky role="navigation"> <div class="localnav-wrapper"> <div class="localnav-background"></div> <div class="localnav-content"> <h2 class="localnav-title"> <a href="/av-foundation/">Audio and Video</a> </h2> <div class="localnav-menu"> <a href="#localnav-menustate" class="localnav-menucta-anchor localnav-menucta-anchor-open" id="localnav-menustate-open"> <span class="localnav-menucta-anchor-label">Open Menu</span> </a> <a href="#" class="localnav-menucta-anchor localnav-menucta-anchor-close" id="localnav-menustate-close"> <span class="localnav-menucta-anchor-label">Close Menu</span> </a> <div class="localnav-menu-tray"> <ul class="localnav-menu-items"> <li class="localnav-menu-item"> <a href="/av-foundation/" class="localnav-menu-link">AVFoundation</a> </li> <li class="localnav-menu-item"> <a href="/audio/" class="localnav-menu-link">Audio</a> </li> <li class="localnav-menu-item"> <a href="/airplay/" class="localnav-menu-link">AirPlay</a> </li> </ul> </div> <div class="localnav-actions"> <div class="localnav-action localnav-action-menucta" aria-hidden="true"> <label for="localnav-menustate" class="localnav-menucta"> <span class="localnav-menucta-chevron"></span> </label> </div> </div> </div> </div> </div> </nav> <label id="localnav-curtain" for="localnav-menustate"></label> <script src="/assets/scripts/ac-localnav.built.js"></script> <script type="text/javascript" src="/assets/scripts/localnav.js"></script> <main id="main" class="main" role="main"> <section class="section section-hero bg-light overflow"> <div class="section-content"> <div class="row"> <div class="column large-10 large-centered small-12 text-center"> <figure class="icon-audio center"></figure> <h1 class="typography-headline">Working with Audio</h1> <p class="typography-intro">Apple platforms provide a comprehensive set of audio frameworks and technologies that are essential to creating a rich app experience. Use them to immerse your users in multichannel audio with spatial rendering, process sound in realtime using AVAudioEngine, and engage the creativity of enthusiasts and professionals through <span class="nowrap">Audio Unit Extensions.</span></p> </div> </div> </div> <figure class="image-hero"></figure> </section> <section class="section section-videos" data-hires="false"> <div class="section-content"> <div class="row"> <div class="column large-5 medium-6 small-12"> <img class="thumbnail center" src="https://devimages-cdn.apple.com/wwdc-services/images/49/3430/3430_wide_250x141_2x.jpg" width="330" height="auto" alt="" /> </div> <div class="column large-6 small-12"> <h4>Session Videos</h4> <p>See the latest in audio technologies for Apple platforms presented at WWDC.</p> <p><a href="/videos/audio-video/" class="nowrap icon icon-after icon-playcircle">Watch the videos</a></p> </div> </div> </div> </section> <section class="section section-resources"> <div class="section-content divider-top"> <div class="row headline-row"> <div class="column large-12 small-12"> <h3>Documentation and Sample Code</h3> </div> </div> <div class="row"> <div id="resources" class="column large-6 small-12"> <h4>Audio Session</h4> <p>Communicate to the system how you intend to use audio in your app.</p> <h5 class="typography-headline-body">Documentation</h5> <ul class="links small"> <li class="document"><a href="/library/archive/documentation/Audio/Conceptual/AudioSessionProgrammingGuide/Introduction/Introduction.html">Audio Session Programming Guide</a></li> <li class="document"><a href="/library/archive/qa/qa1749/_index.html#apple_ref/doc/uid/DTS40011192/">AVAudioSessionMediaServicesWereResetNotification</a></li> </ul> <h4>Playing Audio</h4> <p>Play audio files in your apps with APIs such as Media Player and AVPlayer.</p> <h5 class="typography-headline-body">Documentation</h5> <ul class="links small"> <li class="document"><a href="/documentation/mediaplayer/">Media Player Framework</a></li> <li class="document"><a href="/documentation/avfoundation/avplayer/">AVPlayer Framework</a></li> </ul> <h4>Audio Files and Format Conversion</h4> <p>Open, read, and write to audio files. Convert between different sample rates from your app.</p> <h5 class="typography-headline-body">Sample Code</h5> <ul class="links small"> <li class="sample-code"><a href="/documentation/audiotoolbox/audio_converter_services/encoding_and_decoding_audio/">Encoding and Decoding Audio</a></li> <li class="sample-code"><a href="/library/archive/samplecode/ConvertFile/Introduction/Intro.html#apple_ref/doc/uid/DTS40008649/">Audio Toolbox Convert File</a></li> <li class="sample-code"><a href="/library/archive/samplecode/iPhoneExtAudioFileConvertTest/Introduction/Intro.html#apple_ref/doc/uid/DTS40009222/">Extended Audio File Conversion Test</a></li> </ul> <h4>Recording and Processing Audio</h4> <p>Record and process audio in real-time or offline with AVFoundation APIs.</p> <h5 class="typography-headline-body">Documentation</h5> <ul class="links small"> <li class="document"><a href="/documentation/avfoundation/">AVFoundation Framework</a></li> <li class="document"><a href="/documentation/avfoundation/avaudioengine/">AVAudioEngine Documentation</a></li> <li class="document"><a href="/library/archive/qa/qa1716/_index.html#apple_ref/doc/uid/DTS40010276/">How do I set the volume of audio media for playback with AVPlayer on iOS</a></li> </ul> <h5 class="typography-headline-body">Sample Code</h5> <ul class="links small"> <li class="sample-code"><a href="/documentation/avfoundation/avaudiosession/capturing_stereo_audio_from_built-in_microphones/">Capturing Stereo Audio from Built-In Microphones</a></li> <li class="sample-code"><a href="/library/archive/samplecode/AVAEMixerSample/Introduction/Intro.html#apple_ref/doc/uid/TP40015134/">Using AVAudioEngine for Playback, Mixing and Recording</a></li> <li class="sample-code"><a href="/library/archive/samplecode/AVAEGamingExample/Introduction/Intro.html">AVAudioEngine 3D Audio Example</a></li> <li class="sample-code"><a href="/documentation/avfoundation/audio_track_engineering/performing_offline_audio_processing/">Performing Offline Audio Processing</a></li> <li class="sample-code"><a href="/documentation/avfoundation/audio_track_engineering/building_a_signal_generator/">Building a Signal Generator</a></li> <li class="sample-code"><a href="/documentation/avfoundation/audio_track_engineering/using_voice_processing/">Using Voice Processing</a></li> </ul> <h4>Core Audio</h4> <p>Use the Core Audio framework to interact with device’s audio hardware.</p> <h5 class="typography-headline-body">Sample Code</h5> <ul class="links small"> <li class="sample-code"><a href="/documentation/coreaudio/creating_an_audio_server_driver_plug-in/">Creating an Audio Server Driver Plug-in</a></li> <li class="sample-code"><a href="/documentation/coreaudio/building_an_audio_server_plug-in_and_driver_extension/">Building an Audio Server Plug-in and Driver Extension</a></li> </ul> <h4>Performance</h4> <p>How to fine tune and achieve the best performance in your audio applications.</p> <h5 class="typography-headline-body">Documentation</h5> <ul class="links small"> <li class="document"><a href="/documentation/audiotoolbox/workgroup_management/understanding_audio_workgroups/">Understanding Audio Workgroups</a></li> </ul> </div> <div id="related-content" class="column large-6 small-12"> <h4>Audio Unit (AU) Plug-ins</h4> <p>Create audio effects, instruments, and utilities that can be used as a plug-in within other apps or hosted by digital audio workstations (DAW). </p> <h5 class="typography-headline-body">Documentation</h5> <ul class="links small"> <li class="document"><a href="/documentation/audiotoolbox/">Audio Toolbox Framework</a></li> <li class="document"><a href="/documentation/audiounit/">Audio Unit Framework</a></li> <li class="document"><a href="/documentation/avfaudio/audio_engine/audio_units/creating_an_audio_unit_extension/">Creating an audio unit extension</a></li> <li class="document"><a href="/documentation/audiounit/debugging_out-of-process_audio_units_on_apple_silicon?language=objc">Debugging Out-of-Process Audio Units</a></li> <li class="document"><a href="/documentation/audiotoolbox/hosting_audio_unit_extensions_using_the_auv2_api/">Hosting Audio Unit Extensions Using the AUv2 API</a></li> <li class="document"><a href="/documentation/audiotoolbox/migrating_your_audio_unit_host_to_the_auv3_api/">Migrating Your Audio Unit Host to the AUv3 API</a></li> </ul> <h5 class="typography-headline-body">Sample Code</h5> <ul class="links small"> <li class="sample-code"><a href="https://github.com/apple/AudioUnit-Examples/" class="icon icon-after icon-external">Audio Unit Examples</a> <li class="sample-code"><a href="/documentation/audiotoolbox/incorporating_audio_effects_and_instruments/">Incorporating Audio Effects and Instruments</a></li> <li class="sample-code"><a href="/documentation/audiotoolbox/creating_custom_audio_effects/">Creating Custom Audio Effects</a></li> </ul> <h5 class="typography-headline-body">Utilities</h5> <ul class="links small"> <li class="download"><a href="https://github.com/apple/AudioUnitSDK/">Audio Unit SDK</a></li> </ul> <h4>MIDI</h4> <p>Communicate with MIDI (Musical Instrument Digital Interface) devices such as hardware keyboards and synthesizers.</p> <h5 class="typography-headline-body">Documentation</h5> <ul class="links small"> <li class="document"><a href="/documentation/coremidi/">Core MIDI APIs</a></li> <li class="document"><a href="/library/archive/qa/qa1831/_index.html">Adding Bluetooth LE MIDI Support</a></li> <li class="document"><a href="https://www.midi.org/specifications/item/bluetooth-le-midi/" class="icon icon-after icon-external">Bluetooth LE MIDI Specification</a></li> <li class="document"><a href="/documentation/coremidi/midi_bluetooth/">MIDI Bluetooth</a></li> </ul> <h5 class="typography-headline-body">Sample Code</h5> <ul class="links small"> <li class="sample-code"><a href="/documentation/coremidi/midi_capability_inquiry/publishing_and_discovering_midi_capabilities/">Publishing and Discovering MIDI Capabilities</a></li> <li class="sample-code"><a href="/documentation/coremidi/midi_services/incorporating_midi_2_into_your_apps/">Incorporating MIDI 2 into your apps</a></li> </ul> <h4>Immersive Audio</h4> <p>Create dynamic audio experiences for music, games, and apps that incorporate 3D space, react to events, or vary in response to environmental cues.</p> <h5 class="typography-headline-body">Documentation</h5> <ul class="links small"> <li class="document"><a href="/documentation/phase/">PHASE</a></li> </ul> <h5 class="typography-headline-body">Related articles</h5> <ul class="links small"> <li class="document"><a href="/news/?id=fakg1z5b">Explore Spatial Audio</a></li> <li class="document"><a href="/news/?id=0vz78ua8">Spotlight on: Spatial Audio</a></li> </ul> <h4>Designing Audio Experiences</h4> <p>Whether sound is a primary aspect of your app’s 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