95 lines
3.1 KiB
Swift
95 lines
3.1 KiB
Swift
import Foundation
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import os
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enum ConversationPhase: String {
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case idle
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case connecting
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case listening
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case thinking
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case speaking
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}
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/// Ports the web UI's `inferState` + EMA smoothing (app.js): mic/agent levels
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/// are smoothed with `prev * 0.6 + raw * 0.4`, thresholds are user > 0.035 and
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/// agent > 0.02. When remote audio ends, the state returns to listening
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/// (matching the current web reference at app.js:414-426) rather than becoming
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/// "thinking" forever.
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@MainActor
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final class ConversationStateModel: ObservableObject {
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@Published private(set) var phase: ConversationPhase = .idle
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@Published private(set) var micLevel: Double = 0
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@Published private(set) var agentLevel: Double = 0
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@Published private(set) var isThinkingChipVisible = false
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static let userThreshold = 0.035
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static let agentThreshold = 0.02
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static let thinkingDelay: Duration = .seconds(2)
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private var smoothedMic: Double = 0
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private var smoothedAgent: Double = 0
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private var lastTransition = Date()
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private var chipTask: Task<Void, Never>?
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func start() {
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stop()
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setPhase(.connecting)
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}
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func stop() {
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chipTask?.cancel()
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chipTask = nil
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smoothedMic = 0
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smoothedAgent = 0
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micLevel = 0
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agentLevel = 0
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isThinkingChipVisible = false
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setPhase(.idle)
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}
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func tick(localAudioLevel: Float, remoteAudioLevel: Float) {
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guard phase != .idle else { return }
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smoothedMic = smoothedMic * 0.6 + Double(localAudioLevel) * 0.4
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smoothedAgent = smoothedAgent * 0.6 + Double(remoteAudioLevel) * 0.4
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micLevel = smoothedMic
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agentLevel = smoothedAgent
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let userSpeaking = smoothedMic > Self.userThreshold
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let next: ConversationPhase
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if smoothedAgent > Self.agentThreshold {
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next = .speaking
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} else if userSpeaking {
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next = .listening
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} else {
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// Both silent: return to listening. The previous implementation
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// converted speaking → thinking forever, leaving the UI apparently
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// frozen after an agent response (matches current web reference).
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next = .listening
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}
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setPhase(next)
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}
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private func setPhase(_ next: ConversationPhase) {
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guard next != phase else { return }
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let old = phase
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logger.log("state \(old.rawValue, privacy: .public) -> \(next.rawValue, privacy: .public)")
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phase = next
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lastTransition = Date()
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if next == .thinking {
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chipTask?.cancel()
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chipTask = Task { [weak self] in
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try? await Task.sleep(for: Self.thinkingDelay)
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guard !Task.isCancelled, let self else { return }
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if self.phase == .thinking {
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self.isThinkingChipVisible = true
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}
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}
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} else {
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chipTask?.cancel()
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chipTask = nil
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isThinkingChipVisible = false
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}
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}
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}
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private let logger = Logger(subsystem: "dev.shane.voice", category: "state")
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