Remove verbose prints from CameraServer on Linux due to being printed every second

[Calinou]

Verbose prints were looking like this, with (camera name) is no video capture device being printed once per second (in both the editor and project):

Loading resource: res://polyhaven/gray_rocks_arm_1k.jpg
Using present mode: Enabled
OBS Virtual Camera is no video capture device

OBS Virtual Camera is no video capture device

OBS Virtual Camera is no video capture device

OBS Virtual Camera is no video capture device

We could alternatively find a way to print the message only once per device name, but it would be more involved. I can look into doing this if it'd help significantly with troubleshooting webcam-related issues.

[dsnopek]

Thanks!

This makes sense to me in principle, although, I'm not personally that familiar with the CameraServer stuff.

[mhilbrunner]

Why not one of the ERR_PRINT_ONCE/WARN_PRINT_ONCE/ERR_PRINT_ONCE_ED macros? Couldn't we prepend the device to the message to make them unique? OBS Virtual Camera is no video capture device already fits this, and being printed once would potentially be useful?

[Calinou]

Why not one of the ERR_PRINT_ONCE/WARN_PRINT_ONCE/ERR_PRINT_ONCE_ED macros? Couldn't we prepend the device to the message to make them unique?

The _ONCE effect applies to the call location, not the message's contents:

godot/core/error/error_macros.h

Lines 666 to 678 in b3bcb2d

	/**
	* Prints `m_msg` once during the application lifetime.
	*/
	#define ERR_PRINT_ONCE(m_msg) \
	if (true) { \
	static bool first_print = true; \
	if (first_print) { \
	_err_print_error(FUNCTION_STR, __FILE__, __LINE__, m_msg); \
	first_print = false; \
	} \
	} else \
	((void)0)

This means that using variable contents in the message will still print the message only once per session. We could still make use of WARN_PRINT_ONCE(), but it would only warn you about the first encountered device that triggers the error message.

The more involved approach is to keep an array of discovered camera names and check if the warning has been printed for a given camera name.

[Repiteo]

Thanks!