System Microphone selection

open_wearable/lib/models/audio_input_source.dart

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+/// Describes an audio input that can be used for local audio recordings.
+///
+/// The app owns this model instead of exposing the recorder plugin's device
+/// type through the UI. That keeps persisted selections and widgets isolated
+/// from platform plugin implementation details.
+class AudioInputSource {
+  /// Stable identifier used by the platform recorder to select this source.
+  final String id;
+
+  /// Human-readable label surfaced by the platform.
+  final String label;
+
+  /// Coarse category used for icons and explanatory UI.
+  final AudioInputSourceKind kind;
+
+  /// Whether this option delegates source selection to the operating system.
+  final bool isSystemDefault;
+
+  const AudioInputSource({
+    required this.id,
+    required this.label,
+    required this.kind,
+    this.isSystemDefault = false,
+  });
+
+  /// The synthetic source that lets the OS pick its current default input.
+  static const systemDefault = AudioInputSource(
+    id: '__system_default_audio_input__',
+    label: 'System Default',
+    kind: AudioInputSourceKind.systemDefault,
+    isSystemDefault: true,
+  );
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+    return other is AudioInputSource &&
+        other.id == id &&
+        other.label == label &&
+        other.kind == kind &&
+        other.isSystemDefault == isSystemDefault;
+  }
+
+  @override
+  int get hashCode => Object.hash(id, label, kind, isSystemDefault);
+}
+
+/// Coarse audio input categories used to keep UI copy and icons consistent.
+enum AudioInputSourceKind {
+  systemDefault,
+  builtIn,
+  bluetooth,
+  wearable,
+  external,
+  unknown,
+}
+
+/// Classifies a platform microphone label for display purposes.
+AudioInputSourceKind classifyAudioInputSourceLabel(String label) {
+  final normalized = label.toLowerCase();
+  if (normalized.contains('openearable') ||
+      normalized.contains('open earable') ||
+      normalized.contains('wearable')) {
+    return AudioInputSourceKind.wearable;
+  }
+  if (normalized.contains('bluetooth') ||
+      normalized.contains('ble') ||
+      normalized.contains('headset') ||
+      normalized.contains('airpods')) {
+    return AudioInputSourceKind.bluetooth;
+  }
+  if (normalized.contains('built-in') ||
+      normalized.contains('builtin') ||
+      RegExp(r'\bphone\b').hasMatch(normalized) ||
+      normalized.contains('internal')) {
+    return AudioInputSourceKind.builtIn;
+  }
+  if (normalized.contains('usb') ||
+      normalized.contains('external') ||
+      normalized.contains('line in')) {
+    return AudioInputSourceKind.external;
+  }
+  return AudioInputSourceKind.unknown;
+}