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[768] Encapsulate speech synthesizer, divorce from main queue
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,166 @@ | ||
| // | ||
| // VocableSpeechSynthesizer.swift | ||
| // Vocable | ||
| // | ||
| // Created by Chris Stroud on 4/24/24. | ||
| // Copyright © 2024 WillowTree. All rights reserved. | ||
| // | ||
|
|
||
| import Foundation | ||
| import AVFoundation | ||
| import UIKit | ||
| import Combine | ||
|
|
||
| @MainActor | ||
| protocol VocableSpeechSynthesizerDelegate: AnyObject { | ||
| func voiceProfilePreviewDidBegin(_: AVSpeechSynthesisVoice?) | ||
| func voiceProfilePreviewDidEnd() | ||
| } | ||
|
|
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| actor VocableSpeechSynthesizer: NSObject, AVSpeechSynthesizerDelegate { | ||
|
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| private let synthesizer = AVSpeechSynthesizer() | ||
|
|
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| @MainActor | ||
| private(set) var activePreviewVoice: AVSpeechSynthesisVoice? | ||
|
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| @MainActor | ||
| weak var delegate: VocableSpeechSynthesizerDelegate? | ||
|
|
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| @MainActor | ||
| static let shared = VocableSpeechSynthesizer() | ||
|
|
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| @MainActor | ||
| @Published | ||
| private(set) var isSpeaking: Bool = false | ||
|
|
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| private var synthesisOperations = [AVSpeechUtterance: AsyncStream<NSRange>.Continuation]() | ||
|
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| override init() { | ||
| super.init() | ||
| synthesizer.delegate = self | ||
|
|
||
| Task { | ||
| await speak("") | ||
| } | ||
| } | ||
|
|
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| init(delegate: VocableSpeechSynthesizerDelegate? = nil) { | ||
| self.init() | ||
| Task { @MainActor in | ||
| self.delegate = delegate | ||
| } | ||
| } | ||
|
|
||
| private func setContinuation( | ||
| _ continuation: AsyncStream<NSRange>.Continuation?, | ||
| for utterance: AVSpeechUtterance | ||
| ) { | ||
| synthesisOperations[utterance] = continuation | ||
| } | ||
|
|
||
| private func speak(utterance: AVSpeechUtterance) -> AsyncStream<NSRange> { | ||
| AsyncStream { [weak self] continuation in | ||
| Task.detached(priority: .userInitiated) { [weak self] in | ||
| guard let self else { | ||
| continuation.finish() | ||
| return | ||
| } | ||
| if synthesizer.isSpeaking { | ||
| synthesizer.stopSpeaking(at: .immediate) | ||
| } | ||
| await setContinuation(continuation, for: utterance) | ||
| synthesizer.speak(utterance) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| @discardableResult | ||
| func speak(_ string: String, language: String = AppConfig.activePreferredLanguageCode) -> AsyncStream<NSRange> { | ||
| let utterance = AVSpeechUtterance(string: string) | ||
| if let selectedVoiceID = AppConfig.selectedVoiceIdentifier { | ||
| if let voice = AVSpeechSynthesisVoice(identifier: selectedVoiceID) { | ||
| let languageLocale = NSLocale(localeIdentifier: language) | ||
| let voiceLocale = NSLocale(localeIdentifier: voice.language) | ||
|
|
||
| // Check to be sure the user-provided voice can speak this language | ||
| if languageLocale.languageCode == voiceLocale.languageCode { | ||
| utterance.voice = voice | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // fall back to previous behavior | ||
| if utterance.voice == nil { | ||
| utterance.voice = AVSpeechSynthesisVoice(language: language) | ||
| } | ||
|
|
||
| return speak(utterance: utterance) | ||
| } | ||
|
|
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| @discardableResult | ||
| func playPreview(_ voice: AVSpeechSynthesisVoice) -> AsyncStream<NSRange> { | ||
| let format = String(localized: "voice_preview.sample_audio.introducion_format") | ||
| let localizedUtterance = String.localizedStringWithFormat(format, voice.name) | ||
| let utterance = AVSpeechUtterance(string: localizedUtterance) | ||
| utterance.voice = voice | ||
| utterance.rate = 0.5 | ||
| return speak(utterance: utterance) | ||
| } | ||
|
|
||
| func stopPreview() { | ||
| synthesizer.stopSpeaking(at: .immediate) | ||
| } | ||
|
|
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| private func synthesisOperationDidEnd(utterance: AVSpeechUtterance) { | ||
| synthesisOperations[utterance]?.finish() | ||
| setContinuation(nil, for: utterance) | ||
| } | ||
|
|
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| private func synthesisOperationWillSpeak(utterance: AVSpeechUtterance, range: NSRange) { | ||
| synthesisOperations[utterance]?.yield(range) | ||
| } | ||
|
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| nonisolated | ||
| public func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didStart utterance: AVSpeechUtterance) { | ||
| Task { @MainActor in | ||
| activePreviewVoice = utterance.voice | ||
| isSpeaking = true | ||
| delegate?.voiceProfilePreviewDidBegin(utterance.voice) | ||
| } | ||
| } | ||
|
|
||
| nonisolated | ||
| public func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) { | ||
| Task { @MainActor in | ||
| activePreviewVoice = nil | ||
| isSpeaking = false | ||
| await synthesisOperationDidEnd(utterance: utterance) | ||
| delegate?.voiceProfilePreviewDidEnd() | ||
| } | ||
| } | ||
|
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| nonisolated | ||
| public func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didCancel utterance: AVSpeechUtterance) { | ||
| Task { @MainActor in | ||
| activePreviewVoice = nil | ||
| isSpeaking = false | ||
| await synthesisOperationDidEnd(utterance: utterance) | ||
| delegate?.voiceProfilePreviewDidEnd() | ||
| } | ||
| } | ||
|
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| nonisolated | ||
| public func speechSynthesizer( | ||
| _ synthesizer: AVSpeechSynthesizer, | ||
| willSpeakRangeOfSpeechString characterRange: NSRange, | ||
| utterance: AVSpeechUtterance | ||
| ) { | ||
| Task { @MainActor in | ||
| await synthesisOperationWillSpeak( | ||
| utterance: utterance, | ||
| range: characterRange | ||
| ) | ||
| } | ||
| } | ||
| } |
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