ௌ͍ͯ࿩͢iOS ݱ࣮ੈքͷʮԻʯͱͷ࿈ܞ iOSDC Japan 2023 ͨ·Ͷ͗ (@_chocoyama)

ࣗݾ঺հ • LayerX ← STORES ← Ϡϑʔ • iOSͱFlutterΛΑ͘৮Δ • స৬ͯ͠1ϲ݄൒ͷϐνϐν ͨ·Ͷ͗

ࣗݾ঺հ ࣮͸3೥࿈ଓొஃ

ձࣾ঺հ

ԻΛ׆༻ͨ͠ػೳ࣮૷͸ɺ ؆୯͔ͭڧྗʹͳ͍ͬͯΔ ͱ͍͏͜ͱΛ࿩͠·͢

ΞδΣϯμ • ද୊ʹؔ͢ΔiOSඪ४ػೳͷ ಛ௃ͱ࢖͍ํ • ࣮૷ͨ͠σϞͷ঺հ ࿩͢͜ͱ ࿩͞ͳ͍͜ͱ • ཁૉٕज़ͷৄࡉͳղઆ • ࢓૊Έͷਂ͍ཧղ

ΞδΣϯμ 1. ݱ࣮ੈքͷʮԻʯΛ׆༻ͨ͠ػೳ 2. Ի੠ೝࣝͱτϥϯεΫϦϓτ 3. ൃ࿩ʹΑΔϑΟʔυόοΫ 4. Ի੠Ϛονϯά 5. Ի੠෼ྨ 6. ·ͱΊ

ݱ࣮ੈքͷ ʮԻʯΛ׆༻ͨ͠ػೳ

• Siri • FaceTime • Shazam • ϊΠζݕ஌ • Voice Control • VoiceOver • Ի੠ೖྗ • Ի੠ಡΈ্͛ • Ի੠ϝϞ ࣮͸ଟ༷ͳඪ४ػೳ • AVFoundation • CallKit • Core Audio • ShazamKit • SiriKit • SoundAnalysis • Speech ਐԽ͢ΔFramework

• ଟ͘ͷAppͰ͸׆༻͍ͯ͠ͳ͍ • ԻΛ׆༻ͨ͠ମݧઃܭ͸ك • ΩϟονΞοϓͷϞνϕʔγϣϯ΋্͕ΓͮΒ͍ ࣮ࡍͷͱ͜Ζ… ʮ࣮ݱͰ͖Δ͜ͱʯʮ׆༻Ͱ͖ͦ͏ͳ͜ͱʯΛΠϝʔδ͠΍͘͢͢Δ

Ի੠ೝࣝͱτϥϯεΫϦϓτ

• ϚΠΫ΍Ի੠ϑΝΠϧʹΑͬ ͯԻ੠σʔλΛऔΓࠐΈ • γεςϜ͕Ի੠Λղੳ͠ɺς Ωετσʔλʹม׵ • AppଆͰ݁Ռͷ஋Λ׆༻ Ի੠ೝࣝ

• Ի੠ೝࣝͷͨΊͷAPI • Ի੠σʔλΛςΩετʹม׵ ͨ͠Γɺಛ௃൑அʹ΋׆༻Ͱ ͖Δ • iOS17Ҏ߱͸ɺݴޠϞσϧͷ ΧελϚΠζΛαϙʔτ SFSpeechRecognizer

ࣄલ४උ̍ɿAudioEngineͷϔϧύʔ struct AudioEngine { private let audioEngine = AVAudioEngine() func start( bufferSize: AVAudioFrameCount, handler: @escaping (AVAudioPCMBuffer, AVAudioTime) -> Void ) throws { // Ի੠ೝࣝͷ৔߹ͷΦʔσΟΦઃఆ let audioSession = AVAudioSession.sharedInstance() try audioSession.setCategory(.record, mode: .measurement, options: []) try audioSession.setActive(true) // Ի੠ೖྗͷ४උ audioEngine.inputNode.installTap( onBus: 0, bufferSize: bufferSize, format: audioEngine.inputNode.outputFormat(forBus: 0), block: handler ) audioEngine.prepare() try audioEngine.start() } }

Ի੠ೝࣝؔ࿈ͷΠϯελϯεͱϦΫΤετΛ࡞੒ class Transcriptor: ObservableObject { // Ի੠ೝࣝΛ࣮ߦ͢ΔΠϯελϯε private let speechRecognizer = SFSpeechRecognizer(locale: Locale(identifier: “ja-JP"))! // ϦΞϧλΠϜೖྗͰ͸ͳ͘ϑΝΠϧೖྗͷ৔߹͸ɺSFSpeechURLRecognitionRequestΛ࢖͏ private let request = SFSpeechAudioBufferRecognitionRequest() private let audioEngine = AudioEngine() // ೝࣝ݁ՌΛར༻ଆʹ௨஌ @Published private(set) var bestTranscription: SFTranscription? init() { // ϦΫΤετͷηοτΞοϓΛߦ͏ if speechRecognizer.supportsOnDeviceRecognition { // ΦϯσόΠε࣮ߦɿར༻੍ݶ͕ͳ͘ɺϓϥΠόγʔ΋อͨΕΔ // αʔόʔ࣮ߦɿར༻੍ݶ͕͋ΓɺσόΠε֎ʹσʔλ͕ૹ৴͞ΕΔ͕ɺਫ਼౓͕ߴ͍ request.requiresOnDeviceRecognition = true } request.shouldReportPartialResults = true } }

ϨίʔσΟϯάͷ։࢝ func startRecording() async throws { // ར༻Մ൱ͷνΣοΫ guard case .authorized = await withCheckedContinuation({ SFSpeechRecognizer.requestAuthorization($0.resume(returning:)) }), speechRecognizer.isAvailable else { throw TranscriptorError.unavailable } // ΦʔσΟΦΤϯδϯͷىಈ try audioEngine.start(bufferSize: 2048) { buffer, _ in // όοϑΝαΠζ͝ͱͷσʔλΛೝࣝϦΫΤετʹ௥Ճ͍ͯ͘͠ request.append(buffer) } // ೝࣝॲཧͷ։࢝ speechRecognizer.recognitionTask(with: request) { result, _ in DispatchQueue.main.async { self.bestTranscription = result?.bestTranscription } } }

DEMOɿೝࣝͨ͠Ի੠Λදࣔ struct ContentView: View { @StateObject private var transcriptor = Transcriptor() private var recognizedText: String? { // Ի੠ೝࣝ݁Ռ͔ΒϑΥʔϚοτࡁΈจࣈྻΛऔಘ transcriptor.bestTranscription?.formattedString } var body: some View { VStack { if let recognizedText { Text(recognizedText) } RecordingButton { try await transcriptor.startRecording() } } } }

• LayerX͸ϞόΠϧνʔϜ্ཱͪ͛ͨ͹͔Γ • iOSϝΠϯͷΤϯδχΞ͕ࣗ෼1ਓ • ࣸਅΛࡱΓʹདྷͯ͘Ε͍ͯΔਓ΋͍ͳ͍ • ʮ͸͍ɺνʔζʂʯͰγϟολʔΛ੾ΔࣗࡱΓΞϓϦΛ࡞͖ͬͯͨ ࿩͸มΘΔ͕…

࠾༻৘ใ ࠾༻ϙʔλϧɿhttps://jobs.layerx.co.jp/

ൃ࿩ʹΑΔϑΟʔυόοΫ

• จষΛԻ੠ʹม׵͢Δٕज़ • ΞΫηγϏϦςΟπʔϧ΍ Ϣʔβʔ΁ͷϑΟʔυόοΫ IFͱͯ͠׆༻͞ΕΔ Ի੠ൃ࿩ʢText to Speechʣ

• iOSͷςΩετԻ੠ม׵API • ϓϨʔϯςΩετ΍SSMLܗࣜͷσʔλΛೖྗʹͱΔ 
 ※ Speech Synthesis Markup LanguageʢԻ੠߹੒ϚʔΫΞοϓݴޠʣ • ൃ࿩ݴޠ΍εϐʔυͳͲΛίϯτϩʔϧՄೳ • iOS17͔Β͸ύʔιφϧϘΠεʹରԠʢӳޠͷΈʣ AVSpeechSynthesizer

import AVFoundation // PlaneText͔ΒUtteranceͷ࡞੒ let utterance = AVSpeechUtterance(string: text) utterance.prefersAssistiveTechnologySettings = true // ΞγετઃఆҾܧ utterance.rate = 0.5 // εϐʔυ (0 ~ 1) utterance.pitchMultiplier = 1 // ϐον (0.5 ~ 2) utterance.volume = 1 // Իྔ (0 ~ 1) // SSML͔ΒUtteranceͷ࡞੒ let ssml = """ ͜Μʹͪ͸ɺͨ·Ͷ͗Ͱ͢ʂ """ let utterance = AVSpeechUtterance(ssmlRepresentation: ssml) // Voiceͷઃఆ utterance.voice = .init(language: "ja-JP") utterance.voice = .init(identifier: AVSpeechSynthesisVoiceIdentifierAlex) utterance.voice = AVSpeechSynthesisVoice.speechVoices().randomElement() • AVSpeechUtteranceʹ ൃ࿩σʔλΛηοτ • SSMLΛ࢖Θͳͯ͘ ΋ɺ֤छϓϩύςΟ͸ ઃఆՄೳ • AVSpeechSynthesisVoi ceΛηοτͯ͠ɺϏϧ τΠϯԻ੠ͷར༻΋Ͱ ͖Δ AVSpeechSynthesizerͰͷൃ࿩

// AVSpeechSynthesizerͷ࡞੒ let synthesizer = AVSpeechSynthesizer() // ࠶ੜ synthesizer.speak(utterance) // Ұ࣌ఀࢭ synthesizer.pauseSpeaking(at: .immediate) synthesizer.pauseSpeaking(at: .word) // ࠶։ synthesizer.continueSpeaking() // ఀࢭ synthesizer.stopSpeaking(at: .immediate) synthesizer.stopSpeaking(at: .word) • AVSpeechSynthesizer ʹAVSpeechUtterance Λ౉ͯ͠ൃ࿩͢Δ • ίϯτϩʔϧ༻ͷAPI Λ׆༻ͯ͠ࡉ੍͔͍ޚ ΋Ͱ͖Δ AVSpeechSynthesizerͰͷൃ࿩

DEMOɿೖྗͨ͠จࣈྻΛൃ࿩ class SpeechSynthesizer: ObservableObject { @Published var text = “͜Μʹͪ͸ɺͨ·Ͷ͗Ͱ͢ʂ” @Published var selectedVoice = AVSpeechSynthesisVoice .speechVoices() .first { $0.language == "ja-JP" }! @Published var rate: Float = 0.5 @Published var pitchMultiplier: Float = 1 @Published var volume: Float = 1 private let synthesizer: AVSpeechSynthesizer = { let s = AVSpeechSynthesizer() s.usesApplicationAudioSession = false return s }() var voices: [AVSpeechSynthesisVoice] { AVSpeechSynthesisVoice.speechVoices() } func speak() { let utterance = AVSpeechUtterance(string: text) utterance.voice = selectedVoice utterance.rate = rate utterance.pitchMultiplier = pitchMultiplier utterance.volume = volume synthesizer.speak(utterance) } }

DEMOɿԻ੠Ͱͷର࿩ 4'4QFFDI3FDPHOJ[FS "74QFFDI4ZOUIFTJ[FS 0QFO"*"1*

Ի੠Ϛονϯά

• Ի੠ͱҰக͢ΔσʔλΛ୳͢ ٕज़ • ୺຤ͷϚΠΫ͔ΒԻ੠Λऔಘ • ର৅ͷίϯςϯπࣗମ΍ͦͷ ࠶ੜҐஔΛಛఆ͢Δ Ի੠Ϛονϯά

• ԻݯΧλϩά୳஌ • Իڹγάωνϟ͔ΒྨࣅԻݯΛಛఆ • ΧελϜΧλϩάͷ࡞੒ • ಠࣗͷΦʔσΟΦDBΛ࡞੒͠ɺ 
 Ի੠ΛϚονϯά • ϓϨΠϦετ؅ཧ • ೝָࣝͨ͠ۂͷϥΠϒϥϦಉظ ShazamKit

import ShazamKit class Matcher: ObservableObject { @Published private(set) var matchedItem: SHMatchedMediaItem? private let audioEngine = AudioEngine() func startMatching() async throws { let session = SHSession() // ϦΞϧλΠϜͳΦʔσΟΦϚονϯάͷ४උ try audioEngine.start(bufferSize: 2048) { buffer, audioTime in session.matchStreamingBuffer(buffer, at: audioTime) } // ೝࣝͨ͠ϝσΟΞΞΠςϜΛड͚औΔ for await case .match(let match) in session.results { await MainActor.run { matchedItem = match.mediaItems.first } } } } • ʢࣄલʹʣDeveloper ϙʔλϧͰAppService Λ௥Ճ • SHSessionΛ࡞੒ • ΦʔσΟΦσʔλΛ sessionʹྲྀ͠ࠐΉ • ΧλϩάσʔλͱϚο νͨ݁͠ՌΛऔಘ ָۂಛఆ

SHMatchedMediaItemͷϓϩύςΟ܈ func explore(_ mediaItem: SHMatchedMediaItem) { mediaItem.title // λΠτϧ mediaItem.subtitle // αϒλΠτϧ mediaItem.artist // ΞʔςΟετ໊ mediaItem.artworkURL // ΞʔτϫʔΫURL mediaItem.genres // δϟϯϧͷ഑ྻ mediaItem.timeRanges // ࣌ؒൣғ mediaItem.matchOffset. // ϚονՕॴ mediaItem.predictedCurrentMatchOffset // ݱࡏͷϚονՕॴͷ༧ଌ mediaItem.webURL. // ShazamΧλϩάϖʔδ΁ͷϦϯΫ mediaItem.appleMusicID // AppleMusicID mediaItem.appleMusicURL // AppleMusicϖʔδ΁ͷϦϯΫ mediaItem.songs // MusicKitͷSongΦϒδΣΫτ // etc… }

SHMatchedMediaItemͷ׆༻ // ָۂͷίϯτϩʔϧʹ͸ɺMusikKitΛ࢖͏ import MusicKit func play(_ mediaItem: SHMatchedMediaItem) async throws { guard case .authorized = await MusicAuthorization.request() else { return } // SHMatchedMediaItemͷAppleMusicؔ࿈ͷϓϩύςΟΛࢀর SystemMusicPlayer.shared.queue = .init(for: mediaItem.songs) try await SystemMusicPlayer.shared.play() }

DEMOɿฉ͖औͬͨԻݯΛಛఆ struct ContentView: View { @StateObject private var matcher = Matcher() var body: some View { VStack(spacing: 56) { if let mediaItem = matcher.matchedItem { MatchedMediaItemView(mediaItem) } else if matcher.isActive { MatchedMediaItemView.loading() } RecordingButton { try? await matcher.startMatching() } }.padding() } }

• Shazam CLIΛ࢖ͬͯ࡞ΕΔ • Իݯ͔ΒSignature (.shazamsignature)Λ࡞੒ • ೚ҙͷϝλσʔλ ΛؚΊͨϑΝΠϧ(.csv)Λ༻ҙ • SignatureͱCSVΛඥ෇͚ͯΧλϩάʢ.shazamcatalogʣΛ࡞੒ • Ի੠Ϛονϯά΍ΦϑηοτΛ༻͍ͨମݧߏஙʹ׆༻Մೳ ΧελϜΧλϩά

Ի੠෼ྨ

Ի੠෼ྨ • Ի੠σʔλͷύλʔϯΛࣝผ • ػցֶशϞσϧΛݩʹٕͨ͠ ज़ • ԻݯͷछྨΛಛఆͷΧςΰϦ ʹ෼͚Δ

• Ի੠෼ྨ༻ͷϑϨʔϜϫʔΫ • ΦϯσόΠεͰ࣮ߦՄೳ • iOS15Ҏ߱͸ϏϧτΠϯ͞Εͨ ϞσϧΛ࢖͑Δ • औΓࠐΜͩԻͷಛ௃΍ύλʔϯ Λೝࣝ͠ɺ໿300छྨʹ෼ྨ SoundAnalysis

SNAudioStreamAnalyzer class SoundAnalyzer: NSObject, ObservableObject { @Published private(set) var result: SNClassificationResult? private let audioEngine = AudioEngine() func startAnalyze() throws { // SNClassifySoundRequestΛ࡞੒ let request = try SNClassifySoundRequest(classifierIdentifier: .version1) // ϑΝΠϧೖྗͷ৔߹͸ɺSNAudioFileAnalyzerΛ࢖͏ let analyzer = SNAudioStreamAnalyzer(format: audioEngine.format) try analyzer.add(request, withObserver: self) try audioEngine.start(bufferSize: 2048) { buffer, time in // Ի੠σʔλΛྲྀ͜͠Ή analyzer.analyze(buffer, atAudioFramePosition: time.sampleTime) } } }

SNAudioStreamAnalyzer extension SoundAnalyzer: SNResultsObserving { // ೝࣝ݁Ռ͕௨஌͞Εͯ͘Δ func request(_ request: SNRequest, didProduce result: SNResult) { DispatchQueue.main.async { self.result = result as? SNClassificationResult self.result?.classifications.first?.identifier // ೝࣝͨ͠Ի੠ͷϥϕϧ self.result?.classifications.first?.confidence // ೝࣝͨ͠Ի੠ͷ৴པ౓ } } }

DEMOɿ ໐͍ͬͯΔָثΛಛఆ struct ContentView: View { // … @StateObject private var soundAnalyzer = SoundAnalyzer() var body: some View { ZStack(alignment: .bottom) { ScrollView { LazyVStack(spacing: 0) { // … BandImage(soundAnalyzer.result) } } RecordingButton { try? soundAnalyzer.analyze() }.padding(.vertical) } } }

DEMOɿಈըΛʮস͍੠ʯʮٽ͖੠ʯͰߜΓࠐΈ ಈըϑΝΠϧͷ63- 4/"VEJP'JMF"OBMZ[FS con fi dence >= 0.9 identi fi er == “laughter” $.5JNF3BOHF

·ͱΊ

·ͱΊ • SFSpeechRecognizerɿݴޠೝࣝ • τϥϯεΫϦϓτ΍ɺݴޠΛϑοΫʹͨ͠ΞΫγϣϯ • AVSpeechSynthesizerɿൃ࿩ • Ի੠ग़ྗʹΑΔϑΟʔυόοΫ • ShazamKitɿϚονϯά • ࣄલʹΧλϩάͷ༻ҙ͕ඞཁ • ݴޠͰ͋Δඞཁ͕ແ͘ɺOffsetͷ׆༻΋Ͱ͖Δ • SoundAnalysisɿ෼ྨ • ϏϧτΠϯϞσϧͰ͋Ε͹͙͢ʹ׆༻Մೳ • ΧελϜͷϞσϧΛ༻ҙͯ͠ɺ೚ҙͷ෼ྨ΋૊ΈࠐΊΔ

·ͱΊ • ඪ४ػೳ͚ͩͰ΋ଟ༷ͳମݧΛ࣮ݱͰ͖Δ • ঺հ͖͠Εͳ͔ͬͨػೳ΋ෳ਺ • ࢖͍ॴ͸ݶΒΕΔ͕ɺ༗ޮʹ࢖͑͹ϢχʔΫͳମݧΛఏڙͰ͖Δ

͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ