Phase 1: dual-track audio capture → mixed-mono 16 kHz WAV + mic VAD

AudioRecorder captures system audio (ScreenCaptureKit) + mic (AVAudioEngine) on a single serial ioQueue, one shared monotonic t0, time-driven writers (pad gaps / trim overlaps) so tracks stay aligned, and an energy mic-VAD for 'self' spans. AudioMixer sums the aligned tracks into mixed_mono_16k.wav. SessionController drives a serialized start/stop state machine, writes the session folder + self_vad.json, exposes live level meters, and finalizes on quit. Hardening from review: ioQueue single-domain (no races), stop() never hangs (mic-first teardown + bounded stopCapture), layout-agnostic mic deep-copy, discard-only video output to keep SCStream alive, VAD lockstep on committed frames, stable signing team in project.yml, single-instance enforcement.
2026-06-05 21:30:11 -05:00
parent b2ae3a62b9
commit fd7e1a5907
12 changed files with 1018 additions and 10 deletions
@@ -0,0 +1,38 @@
+import SwiftUI
+
+/// A small horizontal audio level meter. `level` is a peak amplitude (0…1);
+/// it's mapped to a dBFS scale (−60 dB … 0 dB) so normal speech is clearly visible.
+struct LevelBar: View {
+    let label: String
+    let level: Float
+
+    var body: some View {
+        HStack(spacing: 8) {
+            Text(label)
+                .font(.caption2)
+                .foregroundStyle(.secondary)
+                .frame(width: 48, alignment: .leading)
+            GeometryReader { geo in
+                ZStack(alignment: .leading) {
+                    RoundedRectangle(cornerRadius: 2).fill(Color.secondary.opacity(0.2))
+                    RoundedRectangle(cornerRadius: 2)
+                        .fill(color)
+                        .frame(width: geo.size.width * fraction)
+                }
+            }
+            .frame(height: 6)
+        }
+    }
+
+    private var fraction: CGFloat {
+        guard level > 0 else { return 0 }
+        let db = 20 * log10(Double(level))          // −∞ … 0
+        return CGFloat(min(1, max(0, (db + 60) / 60)))
+    }
+
+    private var color: Color {
+        if fraction < 0.02 { return .gray }
+        if fraction > 0.9 { return .red }
+        return .green
+    }
+}