feat: migrate on-device Qwen3 ASR to CoreML for background Flow dictation

Replace MLX GPU inference with CoreML bundles so transcription continues while the host app is backgrounded. Adds model download and warm-up, vendored Qwen3Speech, and updates onboarding, settings, and copy for the ~1.6 GB CoreML package (iOS 18+).
2026-06-23 00:46:58 +08:00
parent 5e5122f172
commit df1c5ff32c
160 changed files with 22080 additions and 492 deletions
@@ -0,0 +1,42 @@
+// UtteranceStreamChunkerTests.swift
+// OSGKeyboardTests
+
+import XCTest
+@testable import OSGKeyboardShared
+
+final class UtteranceStreamChunkerTests: XCTestCase {
+
+    private let config = FlowUtteranceChunkConfig(
+        maxChunkDurationSeconds: 1,
+        overlapDurationSeconds: 0.1,
+        pauseExtensionMaxSeconds: 0.2,
+        pauseRMSThreshold: 0.02,
+        sampleRate: 1_000
+    )
+
+    func testPauseAwareSplitPrefersSilenceNearWindowEnd() {
+        var buffer = [Float](repeating: 0.2, count: 900)
+        buffer.append(contentsOf: [Float](repeating: 0.001, count: 50))
+        buffer.append(contentsOf: [Float](repeating: 0.2, count: 100))
+
+        let split = UtteranceStreamChunker.pauseAwareSplitIndex(in: buffer, config: config)
+        XCTAssertGreaterThanOrEqual(split, config.maxChunkSamples)
+        XCTAssertLessThanOrEqual(split, config.maxChunkSamples + config.pauseExtensionSamples)
+    }
+
+    func testChunksEmitMultipleSegmentsForLongStream() async {
+        let sampleCount = config.maxChunkSamples * 2 + 100
+        let samples = [Float](repeating: 0.05, count: sampleCount)
+        let (stream, continuation) = AsyncStream<AudioBufferSnapshot>.makeStream()
+        continuation.yield(AudioBufferSnapshot(samples: samples, sampleRate: Double(config.sampleRate)))
+        continuation.finish()
+
+        var received: [UtteranceAudioChunk] = []
+        for await chunk in UtteranceStreamChunker.chunks(from: stream, config: config) {
+            received.append(chunk)
+        }
+
+        XCTAssertGreaterThanOrEqual(received.count, 2)
+        XCTAssertTrue(received.last?.isLast == true)
+    }
+}