device.format

Reads from AVCaptureDevice and CMVideoFormatDescriptionGetDimensions. One reading per active camera, whenever the format it is running changes.


Delivery	stream, onChange
Mechanism	kvo
Requires	iOS 17+, hardware only, no simulator, basset 0.1.1+

Real output from basset request get, captured against a running AVCaptureSession:

CAPTURED                  ELAPSED  INSTRUMENT

launch 11331933422406966707
2026-08-23T13:13:04.919Z  +0.0s    camera.device.format(captureDevice)
├─ instanceId                  1
├─ deviceType                  AVCaptureDeviceTypeBuiltInWideAngleCamera
├─ devicePosition              back
├─ deviceUniqueId              com.apple.avfoundation.avcapturedevice.built-in_video:0
├─ formatWidthPixels           1920
├─ formatHeightPixels          1080
├─ formatPixelFormat           420v
├─ formatMinFramesPerSecond    3.0
├─ formatMaxFramesPerSecond    30.0
├─ formatMultiCamSupported     true
├─ formatCount                 50
├─ activeColorSpace            sRGB
├─ systemPressureLevel         AVCaptureSystemPressureLevelNominal
├─ outputPixelFormat           420v
├─ outputPixelFormatSupported  true
├─ videoRotationDegrees        0.0
└─ videoMirrored               false

Getting Started

SDK

CLI

Instruments

Reference