터치 모드에서 iPhone X 플래시를 시작할 수 없습니다.

Question

토치 모드에서 iPhone X 플래시를 실행하는 데 문제가 있습니다.

돌아 가기 AVCaptureDeviceTypeBuiltInTelephotoCamera 캡처 장치로 선택 : 나는

[self.captureDevice lockForConfiguration:nil]; 
BOOL result = [self.captureDevice setTorchModeOnWithLevel:1 error:&error]; 
[self.captureDevice unlockForConfiguration]; 

와 토치 모드로 플래시 빛을 전환하기 위해 노력하고있어

[self.captureDevice isTorchModeSupported:AVCaptureTorchModeOn] 

:

com.apple.avfoundation.avcapturedevice.built-in_video:2' - 
AVCaptureDeviceTypeBuiltInTelephotoCamera 

와 터치 모드 가용성을 확인 후

이 호출은 성공한 것입니다. 결과 == 예, 오류 == nil. 그러나 플래시 표시등이 한 번 깜박이면 꺼집니다.

iPhone X에서이 동작을 직접 보았습니다. iPhone 8 및 iPhone 8 Plus 소유자와 동일한 동작에 대한 보고서가 있습니다. 일부 사용자는 iOS 11.1로 업데이트 한 후에이 문제가 발생한다고 말합니다. 그러나 나는 iPhone 8로 직접 재생산 할 수 없었습니다.

이 문제를 수정하거나 디버그하는 방법에 대한 아이디어가 있습니까? 내 응용 프로그램에서

전체 코드는 다음과 같습니다 :

// Retrieve the back camera 
    if ([AVCaptureDeviceDiscoverySession class]) { 
     DDLogDebug(@"Search camera with AVCaptureDeviceDiscoverySession"); 
     AVCaptureDevice* camera = 
     [AVCaptureDeviceDiscoverySession 
     discoverySessionWithDeviceTypes: @[AVCaptureDeviceTypeBuiltInTelephotoCamera] 
     mediaType:AVMediaTypeVideo 
     position:AVCaptureDevicePositionBack].devices.firstObject; 

     if (!camera) { 
      camera = [AVCaptureDeviceDiscoverySession 
         discoverySessionWithDeviceTypes: @[AVCaptureDeviceTypeBuiltInTelephotoCamera] 
         mediaType:AVMediaTypeVideo 
         position:AVCaptureDevicePositionBack].devices.firstObject; 
     } 
     DDLogDebug(@"Did find %@ camera", camera); 
     self.captureDevice = camera; 
    } else { 
     DDLogDebug(@"Haven't found camera device with AVCaptureDeviceDiscoverySession"); 
    } 

    if (!self.captureDevice) { 
     DDLogDebug(@"Searching at [AVCaptureDevice devices], where %lu devices available", (unsigned long)AVCaptureDevice.devices.count); 
     for (AVCaptureDevice *device in [AVCaptureDevice devices]) { 
      if ([device hasMediaType:AVMediaTypeVideo] && [device hasTorch]) { 
       self.captureDevice = device; 
       break; 
      } 
     } 
    } 

    if (!self.captureDevice) { 
     NSError* error = [NSError buildError:^(MRErrorBuilder *builder) { 
      builder.localizedDescription = NSLocalizedString(@"There is no camera devices able to measure heart rate", nil); 
      builder.domain    = kWTCameraHeartRateMonitorError; 
      builder.code     = 27172; 
     }]; 
     DDLogError(@"%@", error); 
     self.session = nil; 
     self.handler(0, 0, error); 
     return NO; 
    } 

    NSError *error; 
    AVCaptureDeviceInput *input = [[AVCaptureDeviceInput alloc] initWithDevice:self.captureDevice 
                     error:&error]; 
    if (error) { 
     DDLogError(@"%@", error); 
     self.session = nil; 
     self.handler(0, 0, error); 
     return NO; 
    } 


    NSString* deviceType = [self.captureDevice respondsToSelector:@selector(deviceType)] ? self.captureDevice.deviceType : @"Unknown"; 

    DDLogDebug(@"Configurating camera '%@'/'%@' - %@ id %@ at %ld connected: %@", self.captureDevice.localizedName, self.captureDevice.modelID, deviceType, self.captureDevice.uniqueID, (long)self.captureDevice.position, self.captureDevice.connected?@"YES":@"NO"); 

    self.session    = [[AVCaptureSession alloc] init]; 
    NSString* preset = [self.session canSetSessionPreset:AVCaptureSessionPresetLow] ? AVCaptureSessionPresetLow : nil; 
    if (preset) { 
     self.session.sessionPreset = preset; 
    } 

    [self.session beginConfiguration]; 
    [self.session addInput:input]; 

    // Find the max frame rate we can get from the given device 
    AVCaptureDeviceFormat *currentFormat; 
    for (AVCaptureDeviceFormat *format in self.captureDevice.formats) 
    { 
     NSArray *ranges = format.videoSupportedFrameRateRanges; 
     AVFrameRateRange *frameRates = ranges[0]; 

     // Find the lowest resolution format at the frame rate we want. 
     if (frameRates.maxFrameRate == FRAMES_PER_SECOND && (!currentFormat || (CMVideoFormatDescriptionGetDimensions(format.formatDescription).width < CMVideoFormatDescriptionGetDimensions(currentFormat.formatDescription).width && CMVideoFormatDescriptionGetDimensions(format.formatDescription).height < CMVideoFormatDescriptionGetDimensions(currentFormat.formatDescription).height))) 
     { 
      currentFormat = format; 
     } 
    } 

    if (![self.captureDevice isTorchModeSupported:AVCaptureTorchModeOn]) { 
     NSError* error = [NSError buildError:^(MRErrorBuilder *builder) { 
      builder.localizedDescription = NSLocalizedString(@"Torch mode is not supported for your camera", nil); 
      builder.domain    = kWTCameraHeartRateMonitorError; 
      builder.code     = 28633; 
     }]; 
     self.session = nil; 
     DDLogError(@"%@", error); 
     self.session = nil; 
     self.handler(0, 0, error); 
     return NO; 
    } 

    // Tell the device to use the max frame rate. 
    [self.captureDevice lockForConfiguration:nil]; 
    DDLogVerbose(@"Turn on tourch mode with level 0.5"); 
    self.captureDevice.flashMode = AVCaptureFlashModeOff; 
    BOOL result = [self.captureDevice setTorchModeOnWithLevel:0.5 error:&error]; 
    if (!result) { 
     DDLogError(@"%@", error); 
     self.session = nil; 
     self.handler(0, 0, error); 
     return NO; 
    } 
    [self.captureDevice setFocusMode:AVCaptureFocusModeLocked]; 
    [self.captureDevice setFocusModeLockedWithLensPosition:1.0 
             completionHandler:nil]; 
    self.captureDevice.activeFormat = currentFormat; 
    self.captureDevice.activeVideoMinFrameDuration = CMTimeMake(1, FRAMES_PER_SECOND); 
    self.captureDevice.activeVideoMaxFrameDuration = CMTimeMake(1, FRAMES_PER_SECOND); 
    [self.captureDevice unlockForConfiguration]; 

    // Set the output 
    AVCaptureVideoDataOutput* videoOutput = [AVCaptureVideoDataOutput new]; 

    // create a queue to run the capture on 
    dispatch_queue_t captureQueue=dispatch_queue_create("catpureQueue", DISPATCH_QUEUE_SERIAL); 

    // setup our delegate 
    [videoOutput setSampleBufferDelegate:self queue:captureQueue]; 

    // configure the pixel format 

    videoOutput.videoSettings = @{(id)kCVPixelBufferPixelFormatTypeKey: @(kCVPixelFormatType_32BGRA)}; 
    videoOutput.alwaysDiscardsLateVideoFrames = NO; 

    [self.session addOutput:videoOutput]; 

    if (debugPath) { 
     NSError* error; 
     [[NSFileManager defaultManager] removeItemAtPath:debugPath 
                error:nil]; 

     BOOL result = 
     [[NSFileManager defaultManager] createDirectoryAtPath:debugPath 
            withIntermediateDirectories:YES 
                attributes:nil 
                 error:&error]; 
     if (result) { 
      [self setupDebugRecordAt:debugPath withFormat:currentFormat]; 
     } else { 
      DDLogError(@"%@", error); 
     } 

     const char* path = [debugPath cStringUsingEncoding:NSUTF8StringEncoding]; 
     self.filter->setDebugPath(path); 
    } 


    // Start the video session 
    [self.session commitConfiguration]; 

    self.frameNumber = 0; 
    [self.assetWriter startWriting]; 
    [self.assetWriter startSessionAtSourceTime:kCMTimeZero]; 
    [self.session startRunning]; 

Answer 1

마지막으로, 문제가 해결됩니다. 정확한 이유가 확실하지 않습니다. 이 문제와 관련된 모든 정보가 감사하겠습니다.

이 문제는 iOS 11.1을 실행하는 iPhone 8, 8+ 및 iPhone X에서 발생합니다. 양식 iOS를 11.0에서 11.1로 업데이트 한 후 iPhone 8에서이 동작을 재현했습니다. 내가 눈치 무엇

토치가

BOOL result = [self.captureDevice setTorchModeOnWithLevel:0.5 error:&error]; 

를 호출 한 후 켜지고

[self.captureDevice setFocusMode:AVCaptureFocusModeLocked]; 

정도

[self.session commitConfiguration]; 

꺼집니다 것입니다 해결책은 어디에 ALL 토치 구성을 수행했다 다른 세션 및 장치 구성이 완료되고 세션이 시작됩니다.

내 현재의 구현은 다음과 같습니다

// Session configuration ... 

[self.session startRunning]; 

if (![self.captureDevice isTorchModeSupported:AVCaptureTorchModeOn]) { 
    NSError* error = [NSError buildError:^(MRErrorBuilder *builder) { 
     builder.localizedDescription = NSLocalizedString(@"Torch mode is not supported for your camera", nil); 
     builder.domain    = kWTCameraHeartRateMonitorError; 
     builder.code     = 28633; 
    }]; 
    DDLogError(@"%@", error); 
    if (self.session) { 
     [self.session stopRunning]; 
    } 
    self.session = nil; 
    self.handler(0, 0, error); 
    return NO; 
} 

[self.captureDevice lockForConfiguration:nil]; 
self.captureDevice.flashMode = AVCaptureFlashModeOff; 
[self.captureDevice setFocusMode:AVCaptureFocusModeLocked]; 
[self.captureDevice setFocusModeLockedWithLensPosition:1.0 
             completionHandler:nil]; 
self.captureDevice.activeFormat = currentFormat; 
self.captureDevice.activeVideoMinFrameDuration = CMTimeMake(1, FRAMES_PER_SECOND); 
self.captureDevice.activeVideoMaxFrameDuration = CMTimeMake(1, FRAMES_PER_SECOND); 

// This call should be placed AFTER all other configurations 

BOOL result = [self.captureDevice setTorchModeOnWithLevel:0.5 error:&error]; 
if (!result) { 
    DDLogError(@"%@", error); 
    self.session = nil; 
    self.handler(0, 0, error); 
    return NO; 
} 
[self.captureDevice unlockForConfiguration];