supportsExposureModeCustom(lensAperture:duration:iso:)

Reports if the given set of exposure parameters are supported by this format.

Declaration

func supportsExposureModeCustom(lensAperture: Float, duration: CMTime, iso ISO: Float) -> Bool

Discussion

The intended use of this method is to query which combinations of “Auto” parameters (AVFCapture/AVCaptureLensApertureAuto, AVFCapture/AVCaptureExposureDurationAuto, AVFCapture/AVCaptureISOAuto) are supported by this format. If you pass a numeric constant it will be range checked against the parameter’s supported min and max. However you can also pass the “Current” constants (AVFCapture/AVCaptureLensApertureCurrent, AVFCapture/AVCaptureExposureDurationCurrent, AVFCapture/AVCaptureISOCurrent) to generically query locked vs. auto parameter support without picking arbitrary lock values.

note:

To query support for “shutter priority” where the exposure duration is locked but auto-exposure continues to manage aperture and ISO:

format.supportsExposureModeCustom(lensAperture: AVCaptureDevice.autoLensAperture, duration: AVCaptureDevice.currentExposureDuration, iso: AVCaptureDevice.autoISO)

Devices that have fixed aperture will have equivalent support for AVFCapture/AVCaptureLensApertureAuto and AVFCapture/AVCaptureLensApertureCurrent.