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[Camera] Add method to switch to a specific video device #42

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Merged
YuAo merged 1 commit into from
Mar 12, 2022
Merged

[Camera] Add method to switch to a specific video device #42

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51 changes: 30 additions & 21 deletions Sources/VideoIO/Camera.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ public class Camera {
case cannotAddInput
case cannotAddOutput
case metadataObjectTypeNotAvailable
case noRequiredMediaTypeFoundOnDevice
}

public struct Configurator {
Expand Down Expand Up @@ -125,32 +126,40 @@ public class Camera {
}
let discoverySession = AVCaptureDevice.DiscoverySession(deviceTypes: deviceTypes, mediaType: .video, position: position)
if let device = discoverySession.devices.first {
let newVideoDeviceInput = try AVCaptureDeviceInput(device: device)
self.captureSession.beginConfiguration()
if let currentVideoDeviceInput = self.videoDeviceInput {
self.captureSession.removeInput(currentVideoDeviceInput)
}
if self.captureSession.canAddInput(newVideoDeviceInput) {
self.captureSession.addInput(newVideoDeviceInput)
self.videoDeviceInput = newVideoDeviceInput
} else {
self.captureSession.commitConfiguration()
throw Error.cannotAddInput
}

if let connection = self.videoCaptureConnection {
self.configurator.videoConnectionConfigurator(self, connection)
}
self.captureSession.commitConfiguration()

try device.lockForConfiguration()
self.configurator.videoDeviceConfigurator(self, device)
device.unlockForConfiguration()
try self.switchToVideoCaptureDevice(device)
} else {
throw Error.noDeviceFound
}
}

public func switchToVideoCaptureDevice(_ device: AVCaptureDevice) throws {
guard device.hasMediaType(.video) else {
throw Error.noRequiredMediaTypeFoundOnDevice
}

let newVideoDeviceInput = try AVCaptureDeviceInput(device: device)
self.captureSession.beginConfiguration()
if let currentVideoDeviceInput = self.videoDeviceInput {
self.captureSession.removeInput(currentVideoDeviceInput)
}
if self.captureSession.canAddInput(newVideoDeviceInput) {
self.captureSession.addInput(newVideoDeviceInput)
self.videoDeviceInput = newVideoDeviceInput
} else {
self.captureSession.commitConfiguration()
throw Error.cannotAddInput
}

if let connection = self.videoCaptureConnection {
self.configurator.videoConnectionConfigurator(self, connection)
}
self.captureSession.commitConfiguration()

try device.lockForConfiguration()
self.configurator.videoDeviceConfigurator(self, device)
device.unlockForConfiguration()
}

public var videoCaptureConnection: AVCaptureConnection? {
return self.videoDataOutput?.connection(with: .video)
}
Expand Down