Addresses an issue where certain USB cameras, specifically the ArduCam OV9281, would freeze when attempting to stream on macOS.
The previous logic started the AVCaptureSession (startRunning) before locking the device for configuration (lockForConfiguration). While this works for many cameras, it causes the OV9281 to become unresponsive.
Further investigation revealed:
- Moving startRunning to after unlockForConfiguration resulted in macOS overriding the custom format and frame rate settings applied within the lock.
- The reliable solution, inspired by findings shared in the community (e.g., Stack Overflow), is to lock the device, apply the configuration, start the session, and then unlock the device.
This commit reorders the operations within deviceStreamOn in UsbCameraImplObjc.mm to follow the sequence: lockForConfiguration -> apply settings -> startRunning -> unlockForConfiguration. This ensures the desired camera configuration is applied correctly without causing device freezes on problematic hardware like the OV9281.
The main restriction is there must be an event loop running on the main thread.
No special action is required for GUI applications, but for non-GUI applications, a
RunOsxRunLoop() function is provided that needs to be called from the main thread.
