j.foucher
483456728d
ElevenLabs sends two kinds of binary WebSocket frames:
1. JSON control messages (starts with '{') — decode as UTF-8, route to OnWsMessage
2. Raw PCM audio (binary, does not start with '{') — broadcast directly as audio
Previously all binary frames were decoded as UTF-8 JSON, causing
"Failed to parse WebSocket message as JSON" for every audio frame.
Fix: peek at first byte of assembled frame buffer:
- '{' → UTF-8 JSON path (null-terminated, routed to existing message handler)
- anything else → raw PCM path (broadcast directly to OnAudioReceived)
Also: improved "Failed to parse JSON" log to show first 80 chars of message,
and added verbose hex dump of binary audio frame prefix for diagnostics.
Compiles cleanly on UE 5.5 Win64.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>