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maziggy
ce5f4e5f1a
Obico polling could freeze the live camera stream within seconds of opening the viewer. Cause: when the buffer-reuse path in obico_detection._capture_frame saw an empty _last_frames[printer_id] entry (stream startup before the first JPEG lands, or upstream mid-reconnect after a 30s read timeout), it fell through to capture_camera_frame_bytes() and opened a second RTSP socket. On firmwares that allow only one camera connection, that second socket forced the printer to drop the live fan-out connection - the viewer's ffmpeg then hit its own 30s timeout, looped through 30 reconnects at 0.2s, all racing the next Obico poll, and the broadcaster pump exited. Widen the gate from "do we have a buffered frame?" to "is any fan-out stream registered for this printer?". New is_stream_active() helper checks _active_streams / _active_chamber_streams independently of buffer state. _capture_frame consults it first: if a viewer is attached, it returns the buffered frame when available or None (skip this poll cycle) when not. Never opens a competing socket while a viewer is connected. Cost: at most one missed Obico detection cycle per viewer-attach (~10s lag). Benefit: zero competing-socket events while any viewer is connected. try_get_active_buffered_frame() refactored to delegate to is_stream_active() so the two helpers stay in lockstep. The /camera/snapshot caller is unchanged behaviorally (snapshot is a user-initiated single-shot; falling through to fresh capture on an empty buffer is the desired behavior there).