成功调用我的方法didOutputSampleBuffer
,直到我使用此功能切换摄像机:
func switchCameras() {
captureSession.beginConfiguration()
captureSession.sessionPreset = AVCaptureSessionPresetMedium
var error : NSError? = nil
for input in captureSession.inputs {
captureSession.removeInput(input as! AVCaptureInput)
}
if currentCamera == "back" {
currentCamera = "front"
if captureSession.canAddInput(AVCaptureDeviceInput(device: frontCamera, error: &error)) {
captureSession.addInput(AVCaptureDeviceInput(device: frontCamera, error: &error))
} else {
print(error)
}
} else {
currentCamera = "back"
if captureSession.canAddInput(AVCaptureDeviceInput(device: backCamera, error: &error)) {
captureSession.addInput(AVCaptureDeviceInput(device: backCamera, error: &error))
} else {
}
}
print("chagned")
captureSession.commitConfiguration()
}
切换后,这种方法有时会丢帧,所以我无法拍照。大约5秒钟后,帧会回来。
func captureOutput(captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, fromConnection connection: AVCaptureConnection!) {
connection.videoOrientation = AVCaptureVideoOrientation.Portrait
if capture == true {
self.capture = false
var newBuffer = sampleBuffer
self.capturePicture(newBuffer)
}
}
如果您需要更多代码,请告诉我。
答案 0 :(得分:1)
我通过将输出队列更改为DISPATCH_QUEUE_SERIAL
来解决此问题。
let output = AVCaptureVideoDataOutput()
output.videoSettings = [kCVPixelBufferPixelFormatTypeKey as NSString:kCVPixelFormatType_32BGRA]
let queue = dispatch_queue_create("cameraQueue", DISPATCH_QUEUE_SERIAL)
output.setSampleBufferDelegate(self, queue: dispatch_get_main_queue())