What s New in Core Audio
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- Archibald Elliott
- 9 years ago
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1 Media #WWDC15 What s New in Core Audio Session 507 Akshatha Nagesh AudioEngine er Torrey Holbrook Walker Senior New Feature Salesperson 2015 Apple Inc. All rights reserved. Redistribution or public display not permitted without written permission from Apple.
2 Agenda AVAudioEngine Recap What s New Inter-device Audio AVAudioSession What s New Audio Unit Extensions Nob Hill Thursday 11:00 AM
3 AVAudioEngine Recap
4 Core Audio Stack ios and OS X AVAudioEngine Introduced in ios 8.0/OS X Application AVFoundation Refer to WWDC14 session 502 AVAudioEngine in Practice OpenAL AVAudioSession AVAudioPlayer AVAudioRecorder AVAudioEngine MIDI AudioToolbox Audio Codecs CoreAudio and Drivers
5 AVAudioEngine Goals Provide powerful, feature-rich API set Achieve simple as well as complex tasks Simplify real-time audio
6 AVAudioEngine Features Objective-C / Swift API set Low latency, real-time audio Play and record audio Connect audio processing blocks Capture audio at any point in the processing chain Implement 3D audio for games
7 AVAudioEngine Building blocks Node-AVAudioNode Source nodes: Provide data for rendering Processing nodes: Process data Destination node: Terminating node connected to output hardware
8 Sample Engine Setup Karaoke InputNode EffectNode (Delay) PlayerNode (Backing Track) MixerNode OutputNode NodeTapBlock (Analyze) PlayerNode (Sound Effects)
9 Sample Engine Setup Karaoke Source nodes InputNode EffectNode (Delay) PlayerNode (Backing Track) MixerNode OutputNode NodeTapBlock (Analyze) PlayerNode (Sound Effects)
10 Sample Engine Setup Karaoke Processing nodes InputNode EffectNode (Delay) PlayerNode (Backing Track) MixerNode OutputNode NodeTapBlock (Analyze) PlayerNode (Sound Effects)
11 Sample Engine Setup Karaoke Destination node InputNode EffectNode (Delay) PlayerNode (Backing Track) MixerNode OutputNode NodeTapBlock (Analyze) PlayerNode (Sound Effects)
12 Mixer Nodes AVAudioMixerNode Performs sample rate conversion, up/down mixing of channels Supports mono, stereo and multichannel inputs AVAudioEnvironmentNode Simulates a 3D space (listener is implicit) Supports mono and stereo inputs Spatializes only mono inputs
13 AVAudioMixing Protocol Defines properties for a mixer input bus Source nodes conform to this protocol Properties cached when not connected to a mixer Properties applied on connection to a mixer
14 AVAudioMixing Protocol Properties Common (all mixer nodes) volume - player.volume = 0.5 Stereo (AVAudioMixerNode) pan - player.pan = D (AVAudioEnvironmentNode) position - player.position = AVAudioMake3DPoint(-2.0, 0.0, 5.0) obstruction, occlusion, renderingalgorithm and more
15 AVAudioMixing Protocol Sample setup MixerNode PlayerNode MixerNode (Main Mixer) EnvironmentNode
16 AVAudioMixing Protocol Sample setup properties are cached MixerNode PlayerNode Mixing Settings volume = 0.5 pan = -1.0 position = (-1, 2, -5) MixerNode (Main Mixer) EnvironmentNode
17 AVAudioMixing Protocol Sample setup volume and pan take effect Mixing Settings MixerNode PlayerNode volume = 0.5 pan = -1.0 position = (-1, 2, -5) MixerNode (Main Mixer) EnvironmentNode
18 AVAudioMixing Protocol Sample setup MixerNode PlayerNode Mixing Settings volume = 0.5 pan = -1.0 position = (-1, 2, -5) MixerNode (Main Mixer) EnvironmentNode volume and position take effect
19 Handling Multichannel Audio Hardware setup OS X ios AVAudioEngine setup
20 Handling Multichannel Audio Hardware setup: OS X User can configure the hardware through Audio MIDI Setup
21 Handling Multichannel Audio Hardware setup: ios Configure AVAudioSession Playback use case: - Activate audio session - Check maximumoutputnumberofchannels - Set preferredoutputnumberofchannels - Verify actual outputnumberofchannels
22 Handling Multichannel Audio Hardware setup: ios-code example // example: audio playback use case do { let desirednumchannels = 6 // for 5.1 rendering let audiosession = AVAudioSession.sharedInstance() let category = AVAudioSessionCategoryPlayback try audiosession.setcategory(category) try audiosession.setactive(true) // check maximum available output number of channels let maxchannels = audiosession.maximumoutputnumberofchannels
23 Handling Multichannel Audio Hardware setup: ios-code example // example: audio playback use case do { let desirednumchannels = 6 // for 5.1 rendering let audiosession = AVAudioSession.sharedInstance() let category = AVAudioSessionCategoryPlayback try audiosession.setcategory(category) try audiosession.setactive(true) // check maximum available output number of channels let maxchannels = audiosession.maximumoutputnumberofchannels
24 Handling Multichannel Audio Hardware setup: ios-code example // example: audio playback use case do { let desirednumchannels = 6 // for 5.1 rendering let audiosession = AVAudioSession.sharedInstance() let category = AVAudioSessionCategoryPlayback try audiosession.setcategory(category) try audiosession.setactive(true) // check maximum available output number of channels let maxchannels = audiosession.maximumoutputnumberofchannels
25 Handling Multichannel Audio Hardware setup: ios-code example if maxchannels >= desirednumchannels { // set preferred number of output channels try audiosession.setpreferredoutputnumberofchannels(desirednumchannels) } let actualchannelcount = audiosession.outputnumberofchannels // adapt to the actual number of output channels.. } catch { // handle errors }
26 Handling Multichannel Audio Hardware setup: ios-code example if maxchannels >= desirednumchannels { // set preferred number of output channels try audiosession.setpreferredoutputnumberofchannels(desirednumchannels) } let actualchannelcount = audiosession.outputnumberofchannels // adapt to the actual number of output channels.. } catch { // handle errors }
27 Handling Multichannel Audio AVAudioEngine setup: ios / OS X Multichannel content AVAudioMixerNode Spatialized content (games) AVAudioEnvironmentNode
28 Handling Multichannel Audio AVAudioEngine setup: multichannel content Multichannel Content (5.1) PlayerNode MixerNode OutputNode Multichannel Hardware (5.1)
29 Handling Multichannel Audio AVAudioEngine setup: multichannel content set connection format get hardware format Multichannel Content (5.1) PlayerNode MixerNode OutputNode Multichannel Hardware (5.1)
30 Handling Multichannel Audio AVAudioEngine setup: multichannel content set connection format get hardware format Multichannel Content (5.1) PlayerNode MixerNode OutputNode Multichannel Hardware (5.1) // get output hardware format let output = engine.outputnode let outputhwformat = output.outputformatforbus(0) // connect mixer to output let mainmixer = engine.mainmixernode engine.connect(mainmixer, to: output, format: outputhwformat)
31 Handling Multichannel Audio AVAudioEngine setup: multichannel content set connection format get hardware format Multichannel Content (5.1) PlayerNode MixerNode OutputNode Multichannel Hardware (5.1) // get output hardware format let output = engine.outputnode let outputhwformat = output.outputformatforbus(0) // connect mixer to output let mainmixer = engine.mainmixernode engine.connect(mainmixer, to: output, format: outputhwformat)
32 Handling Multichannel Audio AVAudioEngine setup: multichannel content get content format set connection format Multichannel Content (5.1) PlayerNode MixerNode OutputNode Multichannel Hardware (5.1)
33 Handling Multichannel Audio AVAudioEngine setup: multichannel content get content format set connection format Multichannel Content (5.1) PlayerNode MixerNode OutputNode Multichannel Hardware (5.1) do { // open multichannel file for reading let mcfile = try AVAudioFile(forReading: fileurl) // connect player to mixer engine.connect(player, to: mainmixer, format: mcfile.processingformat) } catch {.. }
34 Handling Multichannel Audio AVAudioEngine setup: multichannel content Multichannel Content (5.1) PlayerNode MixerNode OutputNode Multichannel Hardware (5.1) channel mapping // schedule file on player // start engine // start player
35 Handling Multichannel Audio AVAudioEngine setup: spatialized content Mono Content PlayerNode Environment Node OutputNode Multichannel Hardware (5.1)
36 Handling Multichannel Audio AVAudioEngine setup: spatialized content set compatible format get hardware format Mono Content PlayerNode Environment Node OutputNode Multichannel Hardware (5.1)
37 Handling Multichannel Audio AVAudioEngine setup: spatialized content set compatible format get hardware format Mono Content PlayerNode Environment Node OutputNode Multichannel Hardware (5.1) // map output hardware channel layout to a compatible layout let layouttag = kaudiochannellayouttag_audiounit_5_0 // for 5.1 HW layout let layout = AVAudioChannelLayout(layoutTag: layouttag) let envoutputformat = AVAudioFormat( standardformatwithsamplerate: outputhwformat.samplerate, channellayout: layout); engine.connect(envnode, to: output, format: envoutputformat)
38 Handling Multichannel Audio AVAudioEngine setup: spatialized content set compatible format get hardware format Mono Content PlayerNode Environment Node OutputNode Multichannel Hardware (5.1) // map output hardware channel layout to a compatible layout let layouttag = kaudiochannellayouttag_audiounit_5_0 // for 5.1 HW layout let layout = AVAudioChannelLayout(layoutTag: layouttag) let envoutputformat = AVAudioFormat( standardformatwithsamplerate: outputhwformat.samplerate, channellayout: layout); engine.connect(envnode, to: output, format: envoutputformat)
39 Handling Multichannel Audio AVAudioEngine setup: spatialized content set compatible format get hardware format Mono Content PlayerNode Environment Node OutputNode Multichannel Hardware (5.1) // map output hardware channel layout to a compatible layout let layouttag = kaudiochannellayouttag_audiounit_5_0 // for 5.1 HW layout let layout = AVAudioChannelLayout(layoutTag: layouttag) let envoutputformat = AVAudioFormat( standardformatwithsamplerate: outputhwformat.samplerate, channellayout: layout); engine.connect(envnode, to: output, format: envoutputformat)
40 Handling Multichannel Audio AVAudioEngine setup: spatialized content get content format set connection format Mono Content PlayerNode Environment Node OutputNode Multichannel Hardware (5.1)
41 Handling Multichannel Audio AVAudioEngine setup: spatialized content get content format set connection format Mono Content PlayerNode Environment Node OutputNode Multichannel Hardware (5.1) let file = try AVAudioFile(forReading: fileurl) engine.connect(player, to: envnode, format: file.processingformat) // set multichannel rendering algorithm player.renderingalgorithm = AVAudio3DMixingRenderingAlgorithm.SoundField
42 Handling Multichannel Audio AVAudioEngine setup: spatialized content get content format set connection format Mono Content PlayerNode Environment Node OutputNode Multichannel Hardware (5.1) let file = try AVAudioFile(forReading: fileurl) engine.connect(player, to: envnode, format: file.processingformat) // set multichannel rendering algorithm player.renderingalgorithm = AVAudio3DMixingRenderingAlgorithm.SoundField
43 Handling Multichannel Audio AVAudioEngine setup: spatialized content Mono Content PlayerNode Environment Node OutputNode Multichannel Hardware (5.1) spatial mapping // schedule file on player // start engine // start player
44 AVAudioEngine What s new
45 AVAudioEngine What s new Splitting support Audio format conversion support AVAudioCompressedBuffer AVAudioConverter AVAudioSequencer
46 AVAudioEngine What s new Splitting support Audio format conversion support AVAudioCompressedBuffer AVAudioConverter AVAudioSequencer
47 Splitting Support Sample setup PlayerNode EffectNode MixerNode
48 Splitting Support Sample setup PlayerNode EffectNode MixerNode Only one-to-one connections were supported
49 Splitting Support Sample setup PlayerNode MixerNode
50 Splitting Support Sample setup EffectNode 1 PlayerNode MixerNode EffectNode 2
51 Splitting Support Code example EffectNode 1 PlayerNode MixerNode EffectNode 2
52 Splitting Support Code example EffectNode 1 PlayerNode MixerNode EffectNode 2 Connection points AVAudioConnectionPoint [node, bus]
53 Splitting Support Code example // Create an array of player connection points let connpoints = [ AVAudioConnectionPoint(node: effect1, bus: 0), AVAudioConnectionPoint(node: mixer, bus: 1), AVAudioConnectionPoint(node: effect2, bus: 0)]
54 Splitting Support Code example // Create an array of player connection points let connpoints = [ AVAudioConnectionPoint(node: effect1, bus: 0), AVAudioConnectionPoint(node: mixer, bus: 1), AVAudioConnectionPoint(node: effect2, bus: 0)] // Make player connections engine.connect(player, toconnectionpoints: connpoints, frombus: 0, format: playerformat) // Make effect nodes to mixer connections..
55 AVAudioMixing Protocol With splitting EffectNode (Reverb) PlayerNode MixerNode EffectNode (Distortion)
56 AVAudioMixing Protocol With splitting EffectNode (Reverb) volume = 0.5 PlayerNode Mixing Settings volume = 0.5 MixerNode EffectNode (Distortion) volume = 0.5 // set player s global mixing setting player.volume = 0.5
57 AVAudioMixing Protocol With splitting volume = 0.8 (override) EffectNode (Reverb) Mixing Settings volume = 0.8 PlayerNode Mixing Settings volume = 0.5 MixerNode EffectNode (Distortion) volume = 0.5 // override mixing settings of mixer bus0 if let mxdest0 = player.destinationformixer(mixer, bus: 0) { mxdest0.volume = 0.8 }
58 AVAudioMixing Protocol With splitting EffectNode (Reverb) Mixing Settings volume = 0.8 PlayerNode Mixing Settings volume = 0.5 MixerNode EffectNode (Distortion) Mixing Settings volume = 0.2 volume = 0.2 (override) // override mixing settings of mixer bus1 if let mxdest1 = player.destinationformixer(mixer, bus: 1) { mxdest1.volume = 0.2 }
59 AVAudioMixing Protocol With splitting EffectNode (Reverb) Mixing Settings volume = 0.8 PlayerNode Mixing Settings volume = 0.5 MixerNode EffectNode (Distortion) Mixing Settings volume = 0.2 settings lost // disconnect mixer bus1 input, corresponding mixing settings are lost engine.disconnectnodeinput(mixer, bus: 1)
60 AVAudioMixing Protocol With splitting EffectNode (Reverb) Mixing Settings volume = 0.8 PlayerNode Mixing Settings volume = 0.5 MixerNode EffectNode (Distortion)
61 AVAudioMixing Protocol With splitting EffectNode (Reverb) Mixing Settings volume = 0.8 PlayerNode Mixing Settings volume = 0.5 MixerNode EffectNode (Distortion) volume = 0.5 (global settings) // make a new connection, player s global mixing settings take effect engine.connect(effect2, to:mixer, frombus: 0, tobus: 1, format: format)
62 AVAudioMixing Protocol With splitting Source node with multiple mixer connections Properties changed on source node - Applied to all existing/new mixer connections Properties on individual mixer connections - Can be overridden - Not preserved on disconnections
63 Splitting support Restrictions From the split node to the mixer where all split paths terminate: Cannot have AVAudioUnitTimeEffect Cannot have any rate conversion
64 AVAudioEngine What s new Splitting support Audio format conversion support AVAudioCompressedBuffer AVAudioConverter AVAudioSequencer
65 AVAudioBuffer AVAudioPCMBuffer Uncompressed (PCM) audio data AVAudioCompressedBuffer (new in ios 9.0 / OS X El Capitan) Compressed audio data Used with AVAudioConverter
66 AVAudioConverter Utility class, higher-level equivalent for AudioConverter Audio format conversion PCM to PCM - Integer/float, bit depth, interleave/deinterleave, sample rate conversion PCM to/from compressed - Encoding - Decoding Can be used in conjunction with AVAudioEngine
67 AVAudioConverter With AVAudioEngine: sample use case AVAudioEngine PlayerNode EffectNode OutputNode
68 AVAudioConverter With AVAudioEngine: sample use case AVAudioEngine PlayerNode EffectNode OutputNode Compressed Audio Stream
69 AVAudioConverter With AVAudioEngine: sample use case AVAudioEngine PlayerNode EffectNode OutputNode PCMBuffer 1 Compressed Audio Stream PCMBuffer 2 PCMBuffer 3
70 AVAudioConverter With AVAudioEngine: sample use case AVAudioEngine PlayerNode EffectNode OutputNode PCMBuffer 1 Compressed Audio Stream AVAudio Converter PCMBuffer 2 PCMBuffer 3
71 AVAudioConverter Code example: encoding // Input format: 44.1 khz, 2 channel, non-interleaved, 16-bit signed integer let informat = AVAudioFormat( commonformat: AVAudioCommonFormat.PCMFormatInt16, samplerate: 44100, channels: 2, interleaved: false) // Output format: 44.1 khz, 2 channel, AAC var outdesc = AudioStreamBasicDescription( msamplerate: 44100, mformatid: kaudioformatmpeg4aac, mformatflags: 0, mbytesperpacket: 0, mframesperpacket: 0, mbytesperframe: 0, mchannelsperframe: 2, mbitsperchannel: 0, mreserved: 0) let outformat = AVAudioFormat(streamDescription: &outdesc)
72 AVAudioConverter Code example: encoding // Input format: 44.1 khz, 2 channel, non-interleaved, 16-bit signed integer let informat = AVAudioFormat( commonformat: AVAudioCommonFormat.PCMFormatInt16, samplerate: 44100, channels: 2, interleaved: false) // Output format: 44.1 khz, 2 channel, AAC var outdesc = AudioStreamBasicDescription( msamplerate: 44100, mformatid: kaudioformatmpeg4aac, mformatflags: 0, mbytesperpacket: 0, mframesperpacket: 0, mbytesperframe: 0, mchannelsperframe: 2, mbitsperchannel: 0, mreserved: 0) let outformat = AVAudioFormat(streamDescription: &outdesc)
73 AVAudioConverter Code example: encoding // Create a converter let converter = AVAudioConverter(fromFormat: informat, toformat: outformat) // Allocate an input PCM buffer let inbuffer = AVAudioPCMBuffer(PCMFormat: informat, framecapacity: 1024) // Allocate an output compressed buffer let outbuffer = AVAudioCompressedBuffer( format: outformat, packetcapacity: 8, maximumpacketsize: converter.maximumoutputpacketsize)
74 AVAudioConverter Code example: encoding // Create a converter let converter = AVAudioConverter(fromFormat: informat, toformat: outformat) // Allocate an input PCM buffer let inbuffer = AVAudioPCMBuffer(PCMFormat: informat, framecapacity: 1024) // Allocate an output compressed buffer let outbuffer = AVAudioCompressedBuffer( format: outformat, packetcapacity: 8, maximumpacketsize: converter.maximumoutputpacketsize)
75 AVAudioConverter Code example: encoding // Create a converter let converter = AVAudioConverter(fromFormat: informat, toformat: outformat) // Allocate an input PCM buffer let inbuffer = AVAudioPCMBuffer(PCMFormat: informat, framecapacity: 1024) // Allocate an output compressed buffer let outbuffer = AVAudioCompressedBuffer( format: outformat, packetcapacity: 8, maximumpacketsize: converter.maximumoutputpacketsize)
76 AVAudioConverter Code example: encoding // Create an input block that s called when converter needs input let inputblock : AVAudioConverterInputBlock = { innumpackets, outstatus in if (<no_data_available>) { outstatus.memory = AVAudioConverterInputStatus.NoDataNow; return nil; } else if (<end_of_stream>) { outstatus.memory = AVAudioConverterInputStatus.EndOfStream; return nil; } else {.. outstatus.memory = AVAudioConverterInputStatus.HaveData; return inbuffer; // fill and return input buffer } }
77 AVAudioConverter Code example: encoding // Create an input block that s called when converter needs input let inputblock : AVAudioConverterInputBlock = { innumpackets, outstatus in if (<no_data_available>) { outstatus.memory = AVAudioConverterInputStatus.NoDataNow; return nil; } else if (<end_of_stream>) { outstatus.memory = AVAudioConverterInputStatus.EndOfStream; return nil; } else {.. outstatus.memory = AVAudioConverterInputStatus.HaveData; return inbuffer; // fill and return input buffer } }
78 AVAudioConverter Code example: encoding // Create an input block that s called when converter needs input let inputblock : AVAudioConverterInputBlock = { innumpackets, outstatus in if (<no_data_available>) { outstatus.memory = AVAudioConverterInputStatus.NoDataNow; return nil; } else if (<end_of_stream>) { outstatus.memory = AVAudioConverterInputStatus.EndOfStream; return nil; } else {.. outstatus.memory = AVAudioConverterInputStatus.HaveData; return inbuffer; // fill and return input buffer } }
79 AVAudioConverter Code example: encoding // Create an input block that s called when converter needs input let inputblock : AVAudioConverterInputBlock = { innumpackets, outstatus in if (<no_data_available>) { outstatus.memory = AVAudioConverterInputStatus.NoDataNow; return nil; } else if (<end_of_stream>) { outstatus.memory = AVAudioConverterInputStatus.EndOfStream; return nil; } else {.. outstatus.memory = AVAudioConverterInputStatus.HaveData; return inbuffer; // fill and return input buffer } }
80 AVAudioConverter Code example: encoding // Conversion loop outerror = nil while (true) { let status = converter.converttobuffer(outbuffer, error: outerror, withinputfromblock: inputblock) if status == AVAudioConverterOutputStatus.EndOfStream status == AVAudioConverterOutputStatus.Error { break } // outbuffer contains output data.. }
81 AVAudioConverter Code example: encoding // Conversion loop outerror = nil while (true) { let status = converter.converttobuffer(outbuffer, error: outerror, withinputfromblock: inputblock) if status == AVAudioConverterOutputStatus.EndOfStream status == AVAudioConverterOutputStatus.Error { break } // outbuffer contains output data.. }
82 AVAudioConverter Code example: encoding // Conversion loop outerror = nil while (true) { let status = converter.converttobuffer(outbuffer, error: outerror, withinputfromblock: inputblock) if status == AVAudioConverterOutputStatus.EndOfStream status == AVAudioConverterOutputStatus.Error { break } // outbuffer contains output data.. }
83 AVAudioEngine What s new Splitting support Audio format conversion support AVAudioCompressedBuffer AVAudioConverter AVAudioSequencer
84 AVAudioSequencer Plays MIDI files Associated with an AVAudioEngine during instantiation Sends MIDI events to AVAudioUnitMIDIInstrument nodes in the engine
85 AVAudioSequencer Sample setup AVAudioEngine InstrumentNode MixerNode OutputNode
86 AVAudioSequencer Sample setup AVAudioEngine InstrumentNode AVAudioSequencer MixerNode OutputNode
87 AVAudioSequencer Sample setup AVAudioEngine InstrumentNode AVAudioSequencer MixerNode OutputNode
88 AVAudioSequencer Code example: AVAudioEngine setup do { // setup instrument node (e.g. sampler) let sampler = AVAudioUnitSampler() engine.attachnode(sampler) engine.connect(sampler, to: engine.mainmixernode, format: format) try sampler.loadinstrumentaturl(insturl) // start the engine try engine.start() } catch { // handle errors }
89 AVAudioSequencer Code example: AVAudioEngine setup do { // setup instrument node (e.g. sampler) let sampler = AVAudioUnitSampler() engine.attachnode(sampler) engine.connect(sampler, to: engine.mainmixernode, format: format) try sampler.loadinstrumentaturl(insturl) // start the engine try engine.start() } catch { // handle errors }
90 AVAudioSequencer Code example: AVAudioSequencer setup do { // create sequencer and associate with engine let sequencer = AVAudioSequencer(audioEngine: engine) // load MIDI file try sequencer.loadfromurl(fileurl, options: AVMusicSequenceLoadOptions.SMF_PreserveTracks) // start sequencer sequencer.preparetoplay() try sequencer.start() // audio will start playing } catch { // handle error }
91 AVAudioSequencer Code example: AVAudioSequencer setup do { // create sequencer and associate with engine let sequencer = AVAudioSequencer(audioEngine: engine) // load MIDI file try sequencer.loadfromurl(fileurl, options: AVMusicSequenceLoadOptions.SMF_PreserveTracks) // start sequencer sequencer.preparetoplay() try sequencer.start() // audio will start playing } catch { // handle error }
92 AVAudioSequencer Code example: AVAudioSequencer setup do { // create sequencer and associate with engine let sequencer = AVAudioSequencer(audioEngine: engine) // load MIDI file try sequencer.loadfromurl(fileurl, options: AVMusicSequenceLoadOptions.SMF_PreserveTracks) // start sequencer sequencer.preparetoplay() try sequencer.start() // audio will start playing } catch { // handle error }
93 AVAudioSequencer Handling multiple tracks AVAudioEngine t1 t2 InstrumentNode 1 AVAudioSequencer MixerNode OutputNode InstrumentNode 2
94 AVAudioSequencer Handling multiple tracks AVAudioEngine t1 InstrumentNode 1 AVAudioSequencer MixerNode OutputNode t2 InstrumentNode 2
95 AVAudioSequencer Code example: handling multiple tracks // create and setup engine // create sequencer // load MIDI file.. // send individual tracks to different instrument nodes in the engine let tracks = sequencer.tracks tracks[0].destinationaudiounit = sampler tracks[1].destinationaudiounit = midisynth // start sequencer..
96 AVAudioSequencer Transport controls Prepare to play, start, stop Set playback position Seconds or beats Set playback rate
97 Demo AVAudioEngine Akshatha Nagesh AudioEngine er Torrey Holbrook Walker Senior New Feature Salesperson
98 Summary AVAudioEngine Recap Handling multichannel audio What s new Splitting support Audio format conversion support - AVAudioCompressedBuffer - AVAudioConverter AVAudioSequencer
99 Inter-device Audio Mode for ios Torrey Holbrook Walker Senior New Feature Salesperson
100 Recording From ios Devices
101 Recording From ios Devices
102 Recording From ios Devices Digital USB Audio Digital USB Audio
103 Recording Audio From ios Digital recording is possible with USB host mode and USB hardware 3rd party software/frameworks Couldn t this be simpler?
104 Inter-device Audio Mode Record audio digitally over the Lighting to USB cable Stereo 48 khz stream format USB 2.0 audio class-compliant implementation
105 Inter-device Audio Mode No additional hardware No additional software No need to modify OS X or ios applications No system sounds routed to USB
106 Inter-device Audio Mode Device can charge and sync Temporarily disabled functionality Photo import Tethering QuickTime screen capture
107 Inter-device Audio Mode Accessible via Audio MIDI Setup
108 Inter-device Audio Mode
109 Demo Inter-device audio mode Torrey Holbrook Walker Senior New Feature Salesperson
110 Inter-device Audio Mode Requires OS X El Capitan and ios 9 Works on all iphones with a lightning connector Works on all ipads with a lightning connector except first-gen ipad mini Supports multiple devices simultaneously (if you ve got the hubs)
111 CoreAudioKit View weak var viewcontainer: NSView! weak var iosdeviceview: NSView? var controller : func toggleiosdeviceview(sender: NSButton) { if iosdeviceview == nil { controller = CAInterDeviceAudioViewController() iosdeviceview = controller!.view viewcontainer.addsubview(iosdeviceview!) } else { iosdeviceview!.removefromsuperview() iosdeviceview = nil controller = nil } }
112 More CoreAudioKit View Controllers CABTLEMIDIWindowController Displays UI for configuring Bluetooth LE MIDI devices NSWindowController subclass
113 CABTLEMIDIWindowController
114 More CoreAudioKit View Controllers CANetworkBrowserWindowController Displays UI for managing AVB audio devices NSWindowController subclass
115 CoreAudioKit View Controller (cont.)
116 What s New in AVAudioSession Torrey Holbrook Walker Senior New Feature Salesperson
117 Navigation Prompts and Podcasts Problem Listening to podcast while driving Navigation prompts duck podcast audio > Bad user experience!
118 Navigation Prompts and Podcasts Solution Podcast and audio book apps: Use AVAudioSessionModeSpokenAudio Navigation and fitness apps: Use AVAudioSessionCategoryOptions.InterruptSpokenAudioAndMixWithOthers 1st party apps have opted in: Maps, Podcasts, ibooks
119 Navigation Application Session setup do { let audiosession = AVAudioSession.sharedInstance() let category = AVAudioSessionCategoryPlayback var categoryoptions = AVAudioSessionCategoryOptions.DuckOthers if #available(ios 9.0, *) { categoryoptions.unioninplace(.interruptspokenaudioandmixwithothers) } try audiosession.setcategory(category, withoptions: categoryoptions) } catch { // handle errors... }
120 Navigation Application Starting navigation prompts func startnavprompt(promptpath : NSURL) { do { let audiosession = AVAudioSession.sharedInstance() let player = try AVAudioPlayer(contentsOfURL: promptpath) player.delegate = self try audiosession.setactive(true) player.play() } catch { // handle errors... } }
121 Navigation Application Completing navigation prompts // AVAudioPlayerDelegate method func audioplayerdidfinishplaying(player: AVAudioPlayer, successfully flag: Bool) { do { let audiosession = AVAudioSession.sharedInstance() try audiosession.setactive(false, withoptions:.optionnotifyothersondeactivation) } catch { // handle errors... } }
122 Podcast Application Session setup do { let audiosession = AVAudioSession.sharedInstance() let category = AVAudioSessionCategoryPlayback var mode = AVAudioSessionModeDefault if #available(ios 9.0, *) { mode = AVAudioSessionModeSpokenAudio } try audiosession.setcategory(category) try audiosession.setmode(mode)...
123 Podcast Application Session setup... // add interruption handler NSNotificationCenter.defaultCenter().addObserver(self, selector: "handleinterruption:", name:avaudiosessioninterruptionnotification, object: audiosession) // register for other important notifications } catch { } // handle errors...
124 Podcast Application Interruption handling func handleinterruption(notification: NSNotification) { let userinfo = notification.userinfo as! [String: AnyObject] let type = userinfo[avaudiosessioninterruptiontypekey] as! AVAudioSessionInterruptionType switch type { case.began: // update UI to indicate that playback has stopped if (state == isplaying) { wasplaying = true state = stopped }...
125 Podcast Application Interruption handling (cont.)... case.ended: if let flag = userinfo[avaudiosessioninterruptionoptionkey] as? AVAudioSessionInterruptionOptions { if flag ==.OptionShouldResume && wasplaying { // rewind the audio a little player.play() state = isplaying // and update the UI to reflect that playback has resumed } } } // end switch } // end func
126 Recap Enhanced AVAudioEngine Inter-device audio mode CoreAudioKit View Controllers for IDAM, BLE MIDI, and AVB AVAudioSessionModeSpokenAudio AVAudioSessionCategoryOptions.InterruptSpokenAudioAndMixWithOthers
127 Related Sessions Audio Unit Extensions Nob Hill Thursday 11:00 AM What's New in SpriteKit Mission Wednesday 10:00 AM Enhancements to SceneKit Mission Wednesday 2:30 PM
128 Related Labs Audio Lab Audio Lab Graphics, Games, and Media Lab A Graphics, Games, and Media Lab A Thursday 9:00 AM Thursday 1:30 PM
129 More Information Technical Support Developer Technical Support Apple Developer Forums Bugs General Inquiries Craig Keithley, Technologies Evangelist
130
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