startRealtimeSession method
Create and start a real-time audio session
Returns a session object for managing the real-time interaction. Throws UnsupportedError if not supported. Check supportedFeatures first.
Implementation
@override
Future<RealtimeAudioSession> startRealtimeSession(
RealtimeAudioConfig config) {
// ElevenLabs supports real-time audio processing
// This would need to be implemented based on their WebSocket API
throw UnsupportedError('Real-time audio session implementation pending');
}