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VisionCamera

Classes​

Interfaces​

Type Aliases​

AutoFocusSystem​

Ƭ AutoFocusSystem: "contrast-detection" | "phase-detection" | "none"

Indicates a format's autofocus system.

  • "none": Indicates that autofocus is not available
  • "contrast-detection": Indicates that autofocus is achieved by contrast detection. Contrast detection performs a focus scan to find the optimal position
  • "phase-detection": Indicates that autofocus is achieved by phase detection. Phase detection has the ability to achieve focus in many cases without a focus scan. Phase detection autofocus is typically less visually intrusive than contrast detection autofocus

Defined in​

CameraDevice.ts:35

CameraPermissionRequestResult​

Ƭ CameraPermissionRequestResult: "granted" | "denied"

Defined in​

Camera.tsx:18

CameraPermissionStatus​

Ƭ CameraPermissionStatus: "granted" | "not-determined" | "denied" | "restricted"

Defined in​

Camera.tsx:17

CameraPosition​

Ƭ CameraPosition: "front" | "back" | "external"

Represents the camera device position.

  • "back": Indicates that the device is physically located on the back of the phone
  • "front": Indicates that the device is physically located on the front of the phone
  • "external": The camera device is an external camera, and has no fixed facing relative to the phone. (e.g. USB or Continuity Cameras)

Defined in​

CameraDevice.ts:11

CaptureError​

Ƭ CaptureError: "capture/recording-in-progress" | "capture/no-recording-in-progress" | "capture/file-io-error" | "capture/create-temp-file-error" | "capture/create-recorder-error" | "capture/insufficient-storage" | "capture/recorder-error" | "capture/video-not-enabled" | "capture/photo-not-enabled" | "capture/frame-invalid" | "capture/aborted" | "capture/focus-canceled" | "capture/timed-out" | "capture/unknown"

Defined in​

CameraError.ts:34

CodeScannerError​

Ƭ CodeScannerError: "code-scanner/not-compatible-with-outputs" | "code-scanner/code-type-not-supported" | "code-scanner/cannot-load-model"

Defined in​

CameraError.ts:30

CodeType​

Ƭ CodeType: "code-128" | "code-39" | "code-93" | "codabar" | "ean-13" | "ean-8" | "itf" | "upc-e" | "upc-a" | "qr" | "pdf-417" | "aztec" | "data-matrix"

The type of the code to scan.

Defined in​

CodeScanner.ts:6

DeviceError​

Ƭ DeviceError: "device/configuration-error" | "device/no-device" | "device/invalid-device" | "device/microphone-unavailable" | "device/pixel-format-not-supported" | "device/low-light-boost-not-supported" | "device/focus-not-supported" | "device/camera-not-available-on-simulator"

Defined in​

CameraError.ts:7

FormatError​

Ƭ FormatError: "format/invalid-fps" | "format/invalid-video-hdr" | "format/invalid-video-stabilization-mode" | "format/incompatible-pixel-format-with-hdr-setting" | "format/invalid-format" | "format/format-required"

Defined in​

CameraError.ts:16

FrameProcessor​

Ƭ FrameProcessor: Object

Type declaration​

NameType
frameProcessor(frame: Frame) => void
type"frame-processor"

Defined in​

CameraProps.ts:8

Orientation​

Ƭ Orientation: "portrait" | "portrait-upside-down" | "landscape-left" | "landscape-right"

Represents Orientation. Depending on the context, this might be a sensor orientation (relative to the phone's orentation), or view orientation.

  • portrait: 0° (home-button at the bottom)
  • landscape-left: 90° (home-button on the left)
  • portrait-upside-down: 180° (home-button at the top)
  • landscape-right: 270° (home-button on the right)

Defined in​

Orientation.ts:10

ParameterError​

Ƭ ParameterError: "parameter/invalid-parameter" | "parameter/unsupported-output" | "parameter/unsupported-input" | "parameter/invalid-combination"

Defined in​

CameraError.ts:2

PermissionError​

Ƭ PermissionError: "permission/microphone-permission-denied" | "permission/camera-permission-denied"

Defined in​

CameraError.ts:1

PhysicalCameraDeviceType​

Ƭ PhysicalCameraDeviceType: "ultra-wide-angle-camera" | "wide-angle-camera" | "telephoto-camera"

Indentifiers for a physical camera (one that actually exists on the back/front of the device)

  • "ultra-wide-angle-camera": A built-in camera with a shorter focal length than that of a wide-angle camera. (FOV of 94° or higher)
  • "wide-angle-camera": A built-in wide-angle camera. (FOV between 60° and 94°)
  • "telephoto-camera": A built-in camera device with a longer focal length than a wide-angle camera. (FOV of 60° or lower)

Some Camera devices consist of multiple physical devices. They can be interpreted as logical devices, for example:

  • "ultra-wide-angle-camera" + "wide-angle-camera" = dual wide-angle camera.
  • "wide-angle-camera" + "telephoto-camera" = dual camera.
  • "ultra-wide-angle-camera" + "wide-angle-camera" + "telephoto-camera" = triple camera.

Defined in​

CameraDevice.ts:26

PixelFormat​

Ƭ PixelFormat: "yuv" | "rgb" | "native" | "unknown"

Represents the pixel format of a Frame.

If you intend to read Pixels from this Frame or use an ML model for processing, make sure that you are using the expected PixelFormat, otherwise the plugin might not be able to properly understand the Frame's content.

Most ML models operate in either yuv (recommended) or rgb.

  • yuv: Frame is in YUV pixel-format (Y'CbCr 4:2:0 or NV21, 8-bit)
  • rgb: Frame is in RGB pixel-format (RGB or RGBA, 8-bit)
  • native: Frame is in the Camera's native Hardware Buffer format (PRIVATE). This is the most efficient Format.
  • unknown: Frame has unknown/unsupported pixel-format.

Defined in​

PixelFormat.ts:14

SessionError​

Ƭ SessionError: "session/camera-not-ready" | "session/camera-cannot-be-opened" | "session/camera-has-been-disconnected" | "session/audio-in-use-by-other-app" | "session/no-outputs" | "session/audio-session-failed-to-activate"

Defined in​

CameraError.ts:23

SystemError​

Ƭ SystemError: "system/camera-module-not-found" | "system/no-camera-manager" | "system/frame-processors-unavailable" | "system/view-not-found"

Defined in​

CameraError.ts:49

UnknownError​

Ƭ UnknownError: "unknown/unknown"

Defined in​

CameraError.ts:54

VideoStabilizationMode​

Ƭ VideoStabilizationMode: "off" | "standard" | "cinematic" | "cinematic-extended" | "auto"

Indicates a format's supported video stabilization mode. Enabling video stabilization may introduce additional latency into the video capture pipeline.

  • "off": No video stabilization. Indicates that video should not be stabilized
  • "standard": Standard software-based video stabilization. Standard video stabilization reduces the field of view by about 10%.
  • "cinematic": Advanced software-based video stabilization. This applies more aggressive cropping or transformations than standard.
  • "cinematic-extended": Extended software- and hardware-based stabilization that aggressively crops and transforms the video to apply a smooth cinematic stabilization.
  • "auto": Indicates that the most appropriate video stabilization mode for the device and format should be chosen automatically

Defined in​

CameraDevice.ts:46

Variables​

Templates​

• Const Templates: Record<PredefinedTemplates, FormatFilter[]>

Predefined templates for use in useCameraFormat/getCameraFormat.

Example

const format = useCameraFormat(device, Templates.Snapchat)

Defined in​

devices/Templates.ts:27

VisionCameraProxy​

• Const VisionCameraProxy: TVisionCameraProxy

Defined in​

FrameProcessorPlugins.ts:135

Functions​

createFrameProcessor​

â–¸ createFrameProcessor(frameProcessor, type): FrameProcessor

Create a new Frame Processor function which you can pass to the <Camera>. (See "Frame Processors")

Make sure to add the 'worklet' directive to the top of the Frame Processor function, otherwise it will not get compiled into a worklet.

Also make sure to memoize the returned object, so that the Camera doesn't reset the Frame Processor Context each time.

Parameters​

NameType
frameProcessor(frame: Frame) => void
type"frame-processor"

Returns​

FrameProcessor

Defined in​

hooks/useFrameProcessor.ts:14

getCameraDevice​

â–¸ getCameraDevice(devices, position, filter?): CameraDevice | undefined

Get the best matching Camera device that best satisfies your requirements using a sorting filter, or undefined if devices does not contain any devices.

Parameters​

NameTypeDescription
devicesCameraDevice[]-
positionCameraPositionThe position of the Camera device relative to the phone.
filterDeviceFilterThe filter you want to use. The Camera device that matches your filter the closest will be returned

Returns​

CameraDevice | undefined

The Camera device that matches your filter the closest, or undefined if no such Camera Device exists on the given position.

Example

const devices = Camera.getAvailableCameraDevices()
const device = getCameraDevice(devices, 'back', {
   physicalDevices: ['wide-angle-camera']
})

Defined in​

devices/getCameraDevice.ts:38

getCameraFormat​

â–¸ getCameraFormat(device, filters): CameraDeviceFormat

Get the best matching Camera format for the given device that satisfies your requirements using a sorting filter. By default, formats are sorted by highest to lowest resolution.

The filters are ranked by priority, from highest to lowest. This means the first item you pass will have a higher priority than the second, and so on.

Parameters​

NameTypeDescription
deviceCameraDeviceThe Camera Device you're currently using
filtersFormatFilter[]-

Returns​

CameraDeviceFormat

The format that matches your filter the closest.

Example

const format = getCameraFormat(device, [
  { videoResolution: { width: 3048, height: 2160 } },
  { fps: 60 }
])

Defined in​

devices/getCameraFormat.ts:125

isErrorWithCause​

â–¸ isErrorWithCause(error): error is ErrorWithCause

Checks if the given error is of type ErrorWithCause

Parameters​

NameTypeDescription
errorunknownAny unknown object to validate

Returns​

error is ErrorWithCause

true if the given error is of type ErrorWithCause

Defined in​

CameraError.ts:172

runAsync​

â–¸ runAsync(frame, func): void

Runs the given function asynchronously, while keeping a strong reference to the Frame.

For example, if you want to run a heavy face detection algorithm while still drawing to the screen at 60 FPS, you can use runAsync(...) to offload the face detection algorithm to a separate thread.

Parameters​

NameTypeDescription
frameFrameThe current Frame of the Frame Processor.
func() => voidThe function to execute.

Returns​

void

Example

const frameProcessor = useFrameProcessor((frame) => {
  'worklet'
  console.log('New Frame')
  runAsync(frame, () => {
    'worklet'
    const faces = detectFaces(frame)
    const face = [faces0]
    console.log(`Detected a new face: ${face}`)
  })
})

Defined in​

FrameProcessorPlugins.ts:236

runAtTargetFps​

â–¸ runAtTargetFps<T>(fps, func): T | undefined

Runs the given function at the given target FPS rate.

For example, if you want to run a heavy face detection algorithm only once per second, you can use runAtTargetFps(1, ...) to throttle it to 1 FPS.

Type parameters​

Name
T

Parameters​

NameTypeDescription
fpsnumberThe target FPS rate at which the given function should be executed
func() => TThe function to execute.

Returns​

T | undefined

The result of the function if it was executed, or undefined otherwise.

Example

const frameProcessor = useFrameProcessor((frame) => {
  'worklet'
  console.log('New Frame')
  runAtTargetFps(5, () => {
    'worklet'
    const faces = detectFaces(frame)
    console.log(`Detected a new face: ${faces[0]}`)
  })
})

Defined in​

FrameProcessorPlugins.ts:195

tryParseNativeCameraError​

â–¸ tryParseNativeCameraError<T>(nativeError): CameraCaptureError | CameraRuntimeError | T

Tries to parse an error coming from native to a typed JS camera error.

Type parameters​

Name
T

Parameters​

NameTypeDescription
nativeErrorTThe native error instance. This is a JSON in the legacy native module architecture.

Returns​

CameraCaptureError | CameraRuntimeError | T

A CameraRuntimeError or CameraCaptureError, or the nativeError itself if it's not parsable

Method

Defined in​

CameraError.ts:198

useCameraDevice​

â–¸ useCameraDevice(position, filter?): CameraDevice | undefined

Get the best matching Camera device that best satisfies your requirements using a sorting filter.

Parameters​

NameTypeDescription
positionCameraPositionThe position of the Camera device relative to the phone.
filter?DeviceFilterThe filter you want to use. The Camera device that matches your filter the closest will be returned

Returns​

CameraDevice | undefined

The Camera device that matches your filter the closest, or undefined if no such Camera Device exists on the given position.

Example

const device = useCameraDevice('back', {
   physicalDevices: ['wide-angle-camera']
})

Defined in​

hooks/useCameraDevice.ts:18

useCameraDevices​

â–¸ useCameraDevices(): CameraDevice[]

Get all available Camera Devices this phone has.

Camera Devices attached to this phone (back or front) are always available, while external devices might be plugged in or out at any point, so the result of this function might update over time.

Returns​

CameraDevice[]

Defined in​

hooks/useCameraDevices.ts:12

useCameraFormat​

â–¸ useCameraFormat(device, filters): CameraDeviceFormat | undefined

Get the best matching Camera format for the given device that satisfies your requirements using a sorting filter. By default, formats are sorted by highest to lowest resolution.

The filters are ranked by priority, from highest to lowest. This means the first item you pass will have a higher priority than the second, and so on.

Parameters​

NameTypeDescription
deviceundefined | CameraDeviceThe Camera Device you're currently using
filtersFormatFilter[]-

Returns​

CameraDeviceFormat | undefined

The format that matches your filter the closest.

Example

const device = useCameraDevice(...)
const format = useCameraFormat(device, [
  { videoResolution: { width: 3048, height: 2160 } },
  { fps: 60 }
])

Defined in​

hooks/useCameraFormat.ts:23

useCameraPermission​

â–¸ useCameraPermission(): PermissionState

Returns whether the user has granted permission to use the Camera, or not.

If the user doesn't grant Camera Permission, you cannot use the <Camera>.

Returns​

PermissionState

Example

const { hasPermission, requestPermission } = useCameraPermission()

if (!hasPermission) {
  return <PermissionScreen onPress={requestPermission} />
} else {
  return <Camera ... />
}

Defined in​

hooks/useCameraPermission.ts:58

useCodeScanner​

â–¸ useCodeScanner(codeScanner): CodeScanner

Parameters​

NameType
codeScannerCodeScanner

Returns​

CodeScanner

Defined in​

hooks/useCodeScanner.ts:4

useFrameProcessor​

â–¸ useFrameProcessor(frameProcessor, dependencies): FrameProcessor

Returns a memoized Frame Processor function wich you can pass to the <Camera>. (See "Frame Processors")

Make sure to add the 'worklet' directive to the top of the Frame Processor function, otherwise it will not get compiled into a worklet.

Parameters​

NameTypeDescription
frameProcessor(frame: Frame) => voidThe Frame Processor
dependenciesDependencyListThe React dependencies which will be copied into the VisionCamera JS-Runtime.

Returns​

FrameProcessor

The memoized Frame Processor.

Example

const frameProcessor = useFrameProcessor((frame) => {
  'worklet'
  const faces = scanFaces(frame)
  console.log(`Faces: ${faces}`)
}, [])

Defined in​

hooks/useFrameProcessor.ts:54

useMicrophonePermission​

â–¸ useMicrophonePermission(): PermissionState

Returns whether the user has granted permission to use the Microphone, or not.

If the user doesn't grant Audio Permission, you can use the <Camera> but you cannot record videos with audio (the audio={..} prop).

Returns​

PermissionState

Example

const { hasPermission, requestPermission } = useMicrophonePermission()
const canRecordAudio = hasPermission

return <Camera video={true} audio={canRecordAudio} />

Defined in​

hooks/useCameraPermission.ts:76