Rocky
128aab1b02
- Add iCloud key-value settings sync (engine/language/polish/Flow prefs); API keys stay on-device. New "Sync settings via iCloud" toggle. - Redesign cold-start handoff: bottom-bar left-to-right swipe guidance, auto-dismiss on app switch, tap-anywhere to close, retained return link. - Harden keyboard->app handoff with host-disconnected hint. - Include prior Unreleased ASR fixes (route-change crash, fallback warning, multi-utterance recognition, local ASR diagnostics). Release 0.5.0 (build 18).
636 lines
25 KiB
Swift
636 lines
25 KiB
Swift
// ASRService.swift
|
|
// OSGKeyboard · Shared
|
|
//
|
|
// Speech-to-text abstraction. As of iOS 26 being the minimum
|
|
// deployment target, the only ASR backend is `SpeechAnalyzer` +
|
|
// `DictationTranscriber` — always on-device, no cloud fallback, no
|
|
// `requiresOnDevice` toggle. The previous legacy recognizer path is
|
|
// gone; if a future platform ever needs it back,
|
|
// reintroduce as a sibling class in `ASRServiceFactory.make()`.
|
|
//
|
|
// Lives in `OSGKeyboardShared` (not the keyboard extension target) so
|
|
// that the host app's `KeyboardPreviewSheet` can run the same ASR
|
|
// pipeline against real iOS audio — without it, the in-app preview
|
|
// was a static mock that never actually called `SFSpeechRecognizer`,
|
|
// and "did you actually wire up ASR?" was a fair review note.
|
|
|
|
import Foundation
|
|
import AVFoundation
|
|
import CoreMedia
|
|
import Speech
|
|
import os
|
|
|
|
// MARK: - Sendable conformance
|
|
|
|
// `AVAudioPCMBuffer` and `SpeechAnalyzer` are not Sendable. We only
|
|
// ever access them serially — the PCM buffer is built and consumed
|
|
// inside a single Task, and the analyzer is cancelled but never
|
|
// shared concurrently — so an unchecked conformance is sound here.
|
|
extension AVAudioPCMBuffer: @unchecked @retroactive Sendable {}
|
|
|
|
// MARK: - Protocol
|
|
|
|
public protocol ASRService: Sendable {
|
|
/// Start a transcription session. The returned stream emits `.partial`
|
|
/// updates and exactly one `.final` (or `.error`) before finishing.
|
|
/// `SpeechAnalyzer` is always fully on-device, so there is no
|
|
/// `requiresOnDevice` flag — that legacy cloud-fallback control
|
|
/// doesn't apply to the iOS 26 `SpeechAnalyzer` path.
|
|
func transcribe(
|
|
stream: AsyncStream<AudioBufferSnapshot>,
|
|
locale: Locale
|
|
) -> AsyncStream<ASREvent>
|
|
|
|
/// Cancel any in-flight recognition and tear down its tasks.
|
|
func cancel()
|
|
|
|
/// Clears cancellation / cached session state before a new utterance.
|
|
func resetForNewUtterance()
|
|
|
|
/// Pre-load locale assets and analyzer format for lower first-chunk latency.
|
|
func warmup(locale: Locale) async
|
|
|
|
/// Transcribe one PCM chunk (Flow pipelined path). Default wraps `transcribe(stream:)`.
|
|
func transcribeChunk(samples: [Float], locale: Locale) async -> ASRChunkResult
|
|
}
|
|
|
|
public enum ASRChunkResult: Sendable, Equatable {
|
|
case success(String)
|
|
case failure(String)
|
|
case cancelled
|
|
}
|
|
|
|
extension ASRService {
|
|
public func resetForNewUtterance() {}
|
|
|
|
public func warmup(locale: Locale) async {}
|
|
|
|
public func transcribeChunk(samples: [Float], locale: Locale) async -> ASRChunkResult {
|
|
guard !samples.isEmpty else { return .success("") }
|
|
if Task.isCancelled { return .cancelled }
|
|
|
|
let snapshot = AudioBufferSnapshot(samples: samples, sampleRate: 16_000)
|
|
let (stream, continuation) = AsyncStream<AudioBufferSnapshot>.makeStream()
|
|
continuation.yield(snapshot)
|
|
continuation.finish()
|
|
|
|
var lastPartial = ""
|
|
var finalText = ""
|
|
var failure: String?
|
|
|
|
for await event in transcribe(stream: stream, locale: locale) {
|
|
if Task.isCancelled { return .cancelled }
|
|
switch event {
|
|
case .capability:
|
|
break
|
|
case .partial(let text):
|
|
lastPartial = text
|
|
case .final(let text):
|
|
finalText = text
|
|
case .error(let message):
|
|
failure = message
|
|
}
|
|
}
|
|
|
|
if let failure {
|
|
return .failure(failure)
|
|
}
|
|
let trimmed = finalText.trimmingCharacters(in: .whitespacesAndNewlines)
|
|
if !trimmed.isEmpty {
|
|
return .success(trimmed)
|
|
}
|
|
let partial = lastPartial.trimmingCharacters(in: .whitespacesAndNewlines)
|
|
if !partial.isEmpty {
|
|
return .success(partial)
|
|
}
|
|
return .success("")
|
|
}
|
|
}
|
|
|
|
public enum ASREvent: Sendable, Equatable {
|
|
/// Emitted exactly once at the start of every `transcribe` call, so
|
|
/// the UI can flag non-on-device locales (e.g. ja-JP on devices that
|
|
/// only ship on-device ASR for en/zh). The ASR session continues
|
|
/// either way — we fall back to cloud automatically.
|
|
case capability(onDeviceSupported: Bool)
|
|
case partial(String)
|
|
case final(String)
|
|
case error(String)
|
|
}
|
|
|
|
// MARK: - Factory
|
|
|
|
public enum ASRServiceFactory {
|
|
/// Returns on-device SpeechAnalyzer for `local`, or the user's cloud
|
|
/// ASR provider when `engineMode == "cloud"`.
|
|
public static func make(store: AppGroupStore = AppGroupStore()) -> ASRService {
|
|
if store.engineMode == "cloud" {
|
|
return CloudASRService(store: store)
|
|
}
|
|
return SpeechAnalyzerASR()
|
|
}
|
|
}
|
|
|
|
// MARK: - PCM format conversion (testable helpers)
|
|
//
|
|
// Extracted from the audio-thread hot path so the scaling + clipping
|
|
// math can be exercised in unit tests without instantiating the
|
|
// full ASR pipeline. See `OSGKeyboardTests/ASRConversionTests.swift`.
|
|
extension ASRServiceFactory {
|
|
|
|
/// Convert a Float32 PCM buffer (`-1.0...1.0`) to an Int16 PCM
|
|
/// buffer (`-32768...32767`).
|
|
///
|
|
/// - Parameters:
|
|
/// - source: Pointer to `sourceCount` `Float` samples. May be
|
|
/// `nil` when `sourceCount == 0`.
|
|
/// - sourceCount: Number of samples to convert. A `0` count
|
|
/// turns the call into a no-op regardless of the pointers.
|
|
/// - destination: Pointer to at least `sourceCount` slots of
|
|
/// `Int16`. May be `nil` when `sourceCount == 0`.
|
|
///
|
|
/// Per-sample: `Int16(round(clamp(s * 32767, -32768, 32767)))`.
|
|
/// The explicit clip matters: without it, `s == 1.0` would map
|
|
/// to `+32767` (fine) but `s == 1.5` (which can show up at the
|
|
/// audio engine boundary under gain) would wrap to a negative
|
|
/// value after the implicit Float→Int16 conversion. The
|
|
/// `round()` (rather than truncate) preserves DC balance — `0.5`
|
|
/// quantises to `+16384`, not `+16383`, matching what most audio
|
|
/// DAW round-trips expect.
|
|
static func convertFloat32ToInt16(
|
|
source: UnsafePointer<Float>?,
|
|
sourceCount: Int,
|
|
destination: UnsafeMutablePointer<Int16>?
|
|
) {
|
|
guard sourceCount > 0, let source, let destination else { return }
|
|
for i in 0..<sourceCount {
|
|
let scaled = source[i] * 32767.0
|
|
let clipped = Swift.max(-32768.0, Swift.min(32767.0, scaled))
|
|
destination[i] = Int16(clipped.rounded())
|
|
}
|
|
}
|
|
}
|
|
|
|
// MARK: - SpeechAnalyzer implementation (iOS 26+)
|
|
|
|
/// ASR backend that uses the iOS 26 `SpeechAnalyzer` + `DictationTranscriber`
|
|
/// APIs. This engine is always fully on-device.
|
|
final class SpeechAnalyzerASR: ASRService, @unchecked Sendable {
|
|
|
|
private let lock = OSAllocatedUnfairLock()
|
|
private var analyzer: SpeechAnalyzer?
|
|
private var analyzerTask: Task<Void, Never>?
|
|
private var analyzerFinished = false
|
|
/// Reused across pipelined chunks within one utterance (assets + format).
|
|
private var chunkPreparedLocaleID: String?
|
|
private var chunkAnalyzerFormat: AVAudioFormat?
|
|
|
|
func resetForNewUtterance() {
|
|
// Keep chunk format / asset cache warm across utterances in one Flow session.
|
|
}
|
|
|
|
func invalidateChunkPreparationCache() {
|
|
lock.withLock {
|
|
chunkPreparedLocaleID = nil
|
|
chunkAnalyzerFormat = nil
|
|
}
|
|
}
|
|
|
|
func warmup(locale: Locale) async {
|
|
guard let resolvedLocale = await DictationTranscriber.supportedLocale(equivalentTo: locale) else {
|
|
Self.debug("warmup locale unsupported requested=\(locale.identifier(.bcp47))")
|
|
return
|
|
}
|
|
let localeID = resolvedLocale.identifier(.bcp47)
|
|
let cachedLocaleID = lock.withLock { chunkPreparedLocaleID }
|
|
if cachedLocaleID == localeID, lock.withLock({ chunkAnalyzerFormat != nil }) {
|
|
Self.debug("warmup cache hit locale=\(localeID)")
|
|
return
|
|
}
|
|
|
|
let setup = Self.makeDiagnosticTranscriber(locale: resolvedLocale)
|
|
Self.debug(
|
|
"warmup start locale=\(localeID) customLMEnabled=\(setup.customLanguageModelEnabled) " +
|
|
"customLMAttached=\(setup.usesCustomLanguageModel) " +
|
|
"clmState=\(Self.describeCLMState(setup.clmState))"
|
|
)
|
|
|
|
do {
|
|
try await Self.prepareAssetsIfNeeded(for: setup.transcriber, locale: resolvedLocale)
|
|
guard let format = await SpeechAnalyzer.bestAvailableAudioFormat(
|
|
compatibleWith: [setup.transcriber],
|
|
considering: Self.captureFormat
|
|
) else {
|
|
Self.debug("warmup format unsupported locale=\(localeID)")
|
|
return
|
|
}
|
|
lock.withLock {
|
|
chunkPreparedLocaleID = localeID
|
|
chunkAnalyzerFormat = format
|
|
}
|
|
Self.debug("warmup ready locale=\(localeID)")
|
|
} catch {
|
|
Self.debug("warmup failed: \(error.localizedDescription)")
|
|
}
|
|
}
|
|
|
|
func transcribeChunk(samples: [Float], locale: Locale) async -> ASRChunkResult {
|
|
guard !samples.isEmpty else { return .success("") }
|
|
if Task.isCancelled { return .cancelled }
|
|
|
|
let startedAt = Date()
|
|
let rms = Self.rms(of: samples)
|
|
Self.debug(
|
|
"chunk start samples=\(samples.count) rms=\(String(format: "%.4f", rms)) " +
|
|
"locale=\(locale.identifier(.bcp47))"
|
|
)
|
|
do {
|
|
let text = try await transcribeSamples(samples, locale: locale, reuseChunkPrep: true)
|
|
let trimmed = text.trimmingCharacters(in: .whitespacesAndNewlines)
|
|
Self.debug(
|
|
"chunk success textLen=\(trimmed.count) elapsed=\(Self.elapsed(startedAt))s " +
|
|
"empty=\(trimmed.isEmpty)"
|
|
)
|
|
return trimmed.isEmpty ? .success("") : .success(trimmed)
|
|
} catch is CancellationError {
|
|
Self.debug("chunk cancelled elapsed=\(Self.elapsed(startedAt))s")
|
|
return .cancelled
|
|
} catch {
|
|
Self.debug("chunk failed elapsed=\(Self.elapsed(startedAt))s error=\(error.localizedDescription)")
|
|
return .failure(error.localizedDescription)
|
|
}
|
|
}
|
|
|
|
/// Analyze a single PCM buffer without the streaming `transcribe` wrapper.
|
|
private func transcribeSamples(
|
|
_ samples: [Float],
|
|
locale: Locale,
|
|
reuseChunkPrep: Bool
|
|
) async throws -> String {
|
|
guard let resolvedLocale = await DictationTranscriber.supportedLocale(equivalentTo: locale) else {
|
|
throw ASRChunkError.localeUnsupported
|
|
}
|
|
let localeID = resolvedLocale.identifier(.bcp47)
|
|
let setup = Self.makeDiagnosticTranscriber(locale: resolvedLocale)
|
|
Self.debug(
|
|
"chunk setup locale=\(localeID) customLMEnabled=\(setup.customLanguageModelEnabled) " +
|
|
"customLMAttached=\(setup.usesCustomLanguageModel) " +
|
|
"clmState=\(Self.describeCLMState(setup.clmState))"
|
|
)
|
|
|
|
let analyzerFormat: AVAudioFormat
|
|
let cachedPrep = lock.withLock { (chunkPreparedLocaleID, chunkAnalyzerFormat) }
|
|
if reuseChunkPrep,
|
|
cachedPrep.0 == localeID,
|
|
let cached = cachedPrep.1 {
|
|
analyzerFormat = cached
|
|
Self.debug(
|
|
"chunk using cached analyzer format sr=\(Int(cached.sampleRate)) " +
|
|
"channels=\(cached.channelCount) common=\(cached.commonFormat.rawValue)"
|
|
)
|
|
} else {
|
|
try await Self.prepareAssetsIfNeeded(for: setup.transcriber, locale: resolvedLocale)
|
|
guard let format = await SpeechAnalyzer.bestAvailableAudioFormat(
|
|
compatibleWith: [setup.transcriber],
|
|
considering: Self.captureFormat
|
|
) else {
|
|
throw ASRChunkError.formatUnsupported
|
|
}
|
|
analyzerFormat = format
|
|
lock.withLock {
|
|
chunkPreparedLocaleID = localeID
|
|
chunkAnalyzerFormat = format
|
|
}
|
|
Self.debug(
|
|
"chunk prepared analyzer format sr=\(Int(format.sampleRate)) " +
|
|
"channels=\(format.channelCount) common=\(format.commonFormat.rawValue)"
|
|
)
|
|
}
|
|
|
|
let snapshot = AudioBufferSnapshot(samples: samples, sampleRate: 16_000)
|
|
guard let pcm = Self.makeAnalyzerPCMBuffer(from: snapshot, format: analyzerFormat) else {
|
|
throw ASRChunkError.formatUnsupported
|
|
}
|
|
|
|
let analyzer = SpeechAnalyzer(modules: [setup.transcriber])
|
|
try await analyzer.prepareToAnalyze(in: analyzerFormat)
|
|
|
|
let resultsTask = Task<String, Error> {
|
|
var accumulator = ProgressiveDictationTranscriptAccumulator()
|
|
for try await result in setup.transcriber.results {
|
|
if Task.isCancelled { break }
|
|
let text = String(result.text.characters)
|
|
_ = accumulator.ingest(range: result.range, text: text)
|
|
}
|
|
return accumulator.finalize()
|
|
}
|
|
|
|
let inputStream = AsyncStream<AnalyzerInput> { continuation in
|
|
continuation.yield(AnalyzerInput(buffer: pcm))
|
|
continuation.finish()
|
|
}
|
|
|
|
let lastSampleTime = try await analyzer.analyzeSequence(inputStream)
|
|
if let lastSampleTime {
|
|
try await analyzer.finalizeAndFinish(through: lastSampleTime)
|
|
} else {
|
|
await analyzer.cancelAndFinishNow()
|
|
}
|
|
|
|
return try await resultsTask.value
|
|
}
|
|
|
|
private enum ASRChunkError: LocalizedError {
|
|
case localeUnsupported
|
|
case formatUnsupported
|
|
|
|
var errorDescription: String? {
|
|
switch self {
|
|
case .localeUnsupported:
|
|
return SharedL10n.string("error.asr.localeUnsupported")
|
|
case .formatUnsupported:
|
|
return SharedL10n.string("error.asr.formatUnsupported")
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Canonical capture format: 16 kHz mono Float32 from `AudioCaptureService`
|
|
/// / `PreviewASRController` before it reaches SpeechAnalyzer.
|
|
private static let captureFormat = AVAudioFormat(
|
|
commonFormat: .pcmFormatFloat32,
|
|
sampleRate: 16_000,
|
|
channels: 1,
|
|
interleaved: false
|
|
)!
|
|
|
|
func transcribe(
|
|
stream: AsyncStream<AudioBufferSnapshot>,
|
|
locale: Locale
|
|
) -> AsyncStream<ASREvent> {
|
|
AsyncStream { continuation in
|
|
continuation.yield(.capability(onDeviceSupported: true))
|
|
|
|
let task = Task { [weak self] in
|
|
guard let self else { return }
|
|
self.lock.withLock { self.analyzerFinished = false }
|
|
defer {
|
|
self.lock.withLock {
|
|
self.analyzer = nil
|
|
self.analyzerTask = nil
|
|
self.analyzerFinished = true
|
|
}
|
|
}
|
|
|
|
do {
|
|
guard let resolvedLocale = await DictationTranscriber.supportedLocale(equivalentTo: locale) else {
|
|
Self.debug("locale unsupported: \(locale.identifier(.bcp47))")
|
|
continuation.yield(.error(SharedL10n.string("error.asr.localeUnsupported")))
|
|
continuation.finish()
|
|
return
|
|
}
|
|
// Each pipelined chunk is ≤ 30 s; long dictation preset keeps a
|
|
// single chunk coherent (Flow utterances run up to 3 min).
|
|
let setup = Self.makeDiagnosticTranscriber(locale: resolvedLocale)
|
|
Self.debug(
|
|
"stream setup locale=\(resolvedLocale.identifier(.bcp47)) " +
|
|
"customLMEnabled=\(setup.customLanguageModelEnabled) " +
|
|
"customLMAttached=\(setup.usesCustomLanguageModel) " +
|
|
"clmState=\(Self.describeCLMState(setup.clmState))"
|
|
)
|
|
do {
|
|
try await Self.prepareAssetsIfNeeded(for: setup.transcriber, locale: resolvedLocale)
|
|
} catch {
|
|
Self.debug("asset prepare failed: \(error.localizedDescription)")
|
|
continuation.yield(.error(SharedL10n.string("error.asr.assetsNotReady")))
|
|
continuation.finish()
|
|
return
|
|
}
|
|
|
|
let newAnalyzer = SpeechAnalyzer(modules: [setup.transcriber])
|
|
self.lock.withLock { self.analyzer = newAnalyzer }
|
|
|
|
guard let analyzerFormat = await SpeechAnalyzer.bestAvailableAudioFormat(
|
|
compatibleWith: [setup.transcriber],
|
|
considering: Self.captureFormat
|
|
) else {
|
|
continuation.yield(.error(SharedL10n.string("error.asr.formatUnsupported")))
|
|
continuation.finish()
|
|
return
|
|
}
|
|
|
|
try await newAnalyzer.prepareToAnalyze(in: analyzerFormat)
|
|
|
|
let inputStream = self.makeInputStream(from: stream, analyzerFormat: analyzerFormat)
|
|
|
|
// Apple recommends consuming `transcriber.results` concurrently
|
|
// while `analyzeSequence` drains the input stream.
|
|
let resultsTask = Task<String, Error> {
|
|
var accumulator = ProgressiveDictationTranscriptAccumulator()
|
|
for try await result in setup.transcriber.results {
|
|
if Task.isCancelled { break }
|
|
let text = String(result.text.characters)
|
|
guard let full = accumulator.ingest(range: result.range, text: text) else {
|
|
continue
|
|
}
|
|
continuation.yield(.partial(full))
|
|
}
|
|
return accumulator.finalize()
|
|
}
|
|
|
|
let lastSampleTime = try await newAnalyzer.analyzeSequence(inputStream)
|
|
|
|
if let lastSampleTime {
|
|
try await newAnalyzer.finalizeAndFinish(through: lastSampleTime)
|
|
} else {
|
|
await newAnalyzer.cancelAndFinishNow()
|
|
}
|
|
|
|
let lastText: String
|
|
do {
|
|
lastText = try await resultsTask.value
|
|
} catch {
|
|
Self.debug("transcriber results failed: \(error.localizedDescription)")
|
|
continuation.yield(.error(error.localizedDescription))
|
|
continuation.finish()
|
|
return
|
|
}
|
|
|
|
let trimmed = lastText.trimmingCharacters(in: .whitespacesAndNewlines)
|
|
if trimmed.isEmpty {
|
|
continuation.yield(.error(SharedL10n.string("error.asr.noSpeech")))
|
|
} else {
|
|
continuation.yield(.final(trimmed))
|
|
}
|
|
continuation.finish()
|
|
} catch is CancellationError {
|
|
continuation.finish()
|
|
} catch {
|
|
Self.debug("SpeechAnalyzer failed: \(error.localizedDescription)")
|
|
continuation.yield(.error(error.localizedDescription))
|
|
continuation.finish()
|
|
}
|
|
}
|
|
self.lock.withLock { self.analyzerTask = task }
|
|
|
|
continuation.onTermination = { @Sendable [weak self] _ in
|
|
self?.cancel()
|
|
}
|
|
}
|
|
}
|
|
|
|
private struct DiagnosticTranscriber {
|
|
let transcriber: DictationTranscriber
|
|
let customLanguageModelEnabled: Bool
|
|
let usesCustomLanguageModel: Bool
|
|
let clmState: CustomLanguageModelManager.PrepareState
|
|
}
|
|
|
|
private static func makeDiagnosticTranscriber(locale: Locale) -> DiagnosticTranscriber {
|
|
let defaults = AppGroup.defaultsIfAvailable
|
|
let clmKey = AppGroupConfiguration.Keys.localASRCustomLanguageModelEnabled
|
|
let clmEnabled = defaults?.object(forKey: clmKey) == nil
|
|
? true
|
|
: (defaults?.bool(forKey: clmKey) ?? true)
|
|
let clmState = CustomLanguageModelManager.shared.currentState()
|
|
let lmConfiguration = clmEnabled
|
|
? CustomLanguageModelManager.shared.configurationForTranscription(locale: locale)
|
|
: nil
|
|
let transcriber = CustomLanguageModelManager.makeDictationTranscriber(
|
|
locale: locale,
|
|
lmConfiguration: lmConfiguration
|
|
)
|
|
return DiagnosticTranscriber(
|
|
transcriber: transcriber,
|
|
customLanguageModelEnabled: clmEnabled,
|
|
usesCustomLanguageModel: lmConfiguration != nil,
|
|
clmState: clmState
|
|
)
|
|
}
|
|
|
|
private static func describeCLMState(_ state: CustomLanguageModelManager.PrepareState) -> String {
|
|
switch state {
|
|
case .idle:
|
|
return "idle"
|
|
case .preparing:
|
|
return "preparing"
|
|
case .ready:
|
|
return "ready"
|
|
case .failed(let message):
|
|
return "failed(\(message))"
|
|
}
|
|
}
|
|
|
|
private static func rms(of samples: [Float]) -> Float {
|
|
guard !samples.isEmpty else { return 0 }
|
|
var sum: Float = 0
|
|
for sample in samples {
|
|
sum += sample * sample
|
|
}
|
|
return sqrtf(sum / Float(samples.count))
|
|
}
|
|
|
|
private static func elapsed(_ start: Date) -> String {
|
|
String(format: "%.2f", Date().timeIntervalSince(start))
|
|
}
|
|
|
|
private static func debug(_ message: String) {
|
|
OSGLog.asr.info("\(message, privacy: .public)")
|
|
}
|
|
|
|
private static func prepareAssetsIfNeeded(
|
|
for transcriber: DictationTranscriber,
|
|
locale: Locale
|
|
) async throws {
|
|
let localeID = locale.identifier(.bcp47)
|
|
let startedAt = Date()
|
|
do {
|
|
_ = try await AssetInventory.reserve(locale: locale)
|
|
Self.debug("asset reserve ok locale=\(localeID)")
|
|
} catch {
|
|
// Reservation may already exist or slots are full; continue, but
|
|
// log it so local-ASR setup failures are not hidden behind a later
|
|
// "no speech" timeout.
|
|
Self.debug("asset reserve non-fatal locale=\(localeID) error=\(error.localizedDescription)")
|
|
}
|
|
do {
|
|
if let request = try await AssetInventory.assetInstallationRequest(supporting: [transcriber]) {
|
|
Self.debug("asset install required locale=\(localeID)")
|
|
try await request.downloadAndInstall()
|
|
Self.debug("asset install done locale=\(localeID) elapsed=\(elapsed(startedAt))s")
|
|
} else {
|
|
Self.debug("asset already installed locale=\(localeID) elapsed=\(elapsed(startedAt))s")
|
|
}
|
|
} catch {
|
|
Self.debug("asset prepare failed locale=\(localeID) elapsed=\(elapsed(startedAt))s error=\(error.localizedDescription)")
|
|
throw error
|
|
}
|
|
}
|
|
|
|
func cancel() {
|
|
let (task, currentAnalyzer, finished) = lock.withLock { () -> (Task<Void, Never>?, SpeechAnalyzer?, Bool) in
|
|
let t = analyzerTask
|
|
let a = analyzer
|
|
let f = analyzerFinished
|
|
analyzerTask = nil
|
|
analyzer = nil
|
|
return (t, a, f)
|
|
}
|
|
task?.cancel()
|
|
guard !finished, let currentAnalyzer else { return }
|
|
Task { await currentAnalyzer.cancelAndFinishNow() }
|
|
}
|
|
|
|
/// Maps 16 kHz Float32 snapshots into `AnalyzerInput` using the format
|
|
/// returned by `bestAvailableAudioFormat(compatibleWith:considering:)`.
|
|
private func makeInputStream(
|
|
from stream: AsyncStream<AudioBufferSnapshot>,
|
|
analyzerFormat: AVAudioFormat
|
|
) -> AsyncStream<AnalyzerInput> {
|
|
AsyncStream { continuation in
|
|
Task {
|
|
for await snap in stream {
|
|
guard !snap.samples.isEmpty else { continue }
|
|
guard let pcm = Self.makeAnalyzerPCMBuffer(from: snap, format: analyzerFormat) else {
|
|
continue
|
|
}
|
|
continuation.yield(AnalyzerInput(buffer: pcm))
|
|
}
|
|
continuation.finish()
|
|
}
|
|
}
|
|
}
|
|
|
|
private static func makeAnalyzerPCMBuffer(
|
|
from snap: AudioBufferSnapshot,
|
|
format: AVAudioFormat
|
|
) -> AVAudioPCMBuffer? {
|
|
let capacity = AVAudioFrameCount(snap.samples.count)
|
|
guard capacity > 0,
|
|
let pcm = AVAudioPCMBuffer(pcmFormat: format, frameCapacity: capacity) else {
|
|
return nil
|
|
}
|
|
pcm.frameLength = capacity
|
|
|
|
switch format.commonFormat {
|
|
case .pcmFormatInt16:
|
|
guard let dst = pcm.int16ChannelData?[0] else { return nil }
|
|
snap.samples.withUnsafeBufferPointer { src in
|
|
ASRServiceFactory.convertFloat32ToInt16(
|
|
source: src.baseAddress,
|
|
sourceCount: src.count,
|
|
destination: dst
|
|
)
|
|
}
|
|
case .pcmFormatFloat32:
|
|
guard let dst = pcm.floatChannelData?[0] else { return nil }
|
|
snap.samples.withUnsafeBufferPointer { src in
|
|
guard let base = src.baseAddress else { return }
|
|
memcpy(dst, base, src.count * MemoryLayout<Float>.stride)
|
|
}
|
|
default:
|
|
return nil
|
|
}
|
|
return pcm
|
|
}
|
|
}
|