Added chatterbox connections

labs/glitch_odin/gm/lib/teddy_audio_web.dart

@@ -0,0 +1,62 @@
+// ignore_for_file: deprecated_member_use
+import 'dart:html' as html;
+import 'dart:convert';
+import 'dart:typed_data';
+import 'dart:math' as math;
+
+class TeddyAudio {
+  final html.AudioElement _audio = html.AudioElement();
+  bool enabled = false;
+  String status = 'Audio disabled on this device';
+  String? _url;
+  int _generation = 0;
+  TeddyAudio() {
+    _audio.onEnded.listen((_) { status = 'Cue finished'; });
+    _audio.onError.listen((_) { status = 'Browser audio error ${_audio.error?.code}. Use Play current hint here to retry.'; });
+  }
+  Future<void> enable() async {
+    // Unlock this exact media element in the user's tap handler (required on phones).
+    final data = ByteData(16044);
+    void text(int offset, String value) { for (var i=0;i<value.length;i++) { data.setUint8(offset+i,value.codeUnitAt(i)); } }
+    text(0,'RIFF'); data.setUint32(4,16036,Endian.little); text(8,'WAVEfmt ');
+    data.setUint32(16,16,Endian.little); data.setUint16(20,1,Endian.little);
+    data.setUint16(22,1,Endian.little); data.setUint32(24,8000,Endian.little);
+    data.setUint32(28,16000,Endian.little); data.setUint16(32,2,Endian.little);
+    data.setUint16(34,16,Endian.little); text(36,'data'); data.setUint32(40,16000,Endian.little);
+    for (var i=0;i<8000;i++) { data.setInt16(44+i*2,(4000*math.sin(2*math.pi*440*i/8000)).round(),Endian.little); }
+    _audio.src = 'data:audio/wav;base64,${base64Encode(data.buffer.asUint8List())}';
+    try {
+      await _audio.play();
+      enabled = true;
+      _url = null;
+      status = 'Speaker test playing (one-second tone)';
+    } catch (_) {
+      enabled = false;
+      status = 'Browser blocked audio. Tap Enable audio again.';
+    }
+  }
+  void playNow(String url) { enabled = true; sync(url, force:true); }
+  void sync(String? url, {bool force=false}) {
+    if (!enabled || (!force && url == _url)) return;
+    _generation++;
+    final generation = _generation;
+    _audio.pause();
+    _url = url;
+    if (url == null) { status = 'Waiting for Teddy'; return; }
+    _audio.src = url;
+    status = 'Loading Teddy audio';
+    _audio.play().then((_) {
+      if (generation == _generation) status = 'Playing on this device';
+    }).catchError((Object error) {
+      if (generation == _generation) status = 'Playback blocked or unavailable. Tap Play current hint here.';
+    });
+  }
+  void disable() {
+    _generation++;
+    enabled = false;
+    _url = null;
+    _audio.pause();
+    status = 'Audio disabled on this device';
+  }
+  void dispose() { disable(); _audio.src = ''; }
+}