iOS 10 - Objective-C: 如何实现AVCapturePhotoOutput()来捕捉图像和视频？

Question

iOS 10 - Objective-C: 如何实现AVCapturePhotoOutput()来捕捉图像和视频？

iosobjective-ciphoneios10avcapturesession

11

我正试图从我的应用程序中实现捕获图像和视频，而从iOS 10开始，"AVCaptureStillImageOutput"已被弃用。

请帮助我在Objective-C中实现AVCapturePhotoOutput。

这是我的示例代码：

_avCaptureOutput = [[AVCapturePhotoOutput alloc]init];
_avSettings = [AVCapturePhotoSettings photoSettings];


AVCaptureSession* captureSession = [[AVCaptureSession alloc] init];
[captureSession startRunning];



AVCaptureConnection *connection = [self.movieOutput connectionWithMediaType:AVMediaTypeVideo];

if (connection.active)
{
    //connection is active
    NSLog(@"Connection is active");

    id previewPixelType = _avSettings.availablePreviewPhotoPixelFormatTypes.firstObject;
    NSDictionary *format = @{(NSString*)kCVPixelBufferPixelFormatTypeKey:previewPixelType,(NSString*)kCVPixelBufferWidthKey:@160,(NSString*)kCVPixelBufferHeightKey:@160};

    _avSettings.previewPhotoFormat = format;

    [_avCaptureOutput capturePhotoWithSettings:_avSettings delegate:self];


}
else
{
    NSLog(@"Connection is not active");
    //connection is not active
    //try to change self.captureSession.sessionPreset,
    //or change videoDevice.activeFormat
}

- Anand Kore

AVCapturePhotoOutput的目的是什么？ - Jagveer Singh

你实现了 AVCapturePhotoCaptureDelegate 吗？ - ricardopereira

self.movieOutput 是什么类型？ - ricardopereira

self.movieOutput是AVCaptureMovieFileOutput类的一种。是的，我已经实现了AVCapturePhotoCaptureDelegate方法。 - Anand Kore

1个回答

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可以查看英文原文，
原文链接

- ZhangNan · Accepted Answer

_avCaptureOutput = [[AVCapturePhotoOutput alloc]init];
_avSettings = [AVCapturePhotoSettings photoSettings];

AVCaptureSession* captureSession = [[AVCaptureSession alloc] init];
[captureSession startRunning];

[self.avCaptureOutput capturePhotoWithSettings:self.avSettings delegate:self];

self 必须实现 AVCapturePhotoCaptureDelegate

#pragma mark - AVCapturePhotoCaptureDelegate
-(void)captureOutput:(AVCapturePhotoOutput *)captureOutput didFinishProcessingPhotoSampleBuffer:(CMSampleBufferRef)photoSampleBuffer previewPhotoSampleBuffer:(CMSampleBufferRef)previewPhotoSampleBuffer resolvedSettings:(AVCaptureResolvedPhotoSettings *)resolvedSettings bracketSettings:(AVCaptureBracketedStillImageSettings *)bracketSettings error:(NSError *)error
{
    if (error) {
        NSLog(@"error : %@", error.localizedDescription);
    }

    if (photoSampleBuffer) {
        NSData *data = [AVCapturePhotoOutput JPEGPhotoDataRepresentationForJPEGSampleBuffer:photoSampleBuffer previewPhotoSampleBuffer:previewPhotoSampleBuffer];
        UIImage *image = [UIImage imageWithData:data];
    }
}

现在，您已经获得了图像，并可以随心所欲地进行操作。

注意: 自iOS 11以来，-captureOutput:didFinishProcessingPhotoSampleBuffer:...已过时，需要改用-captureOutput:didFinishProcessingPhoto:error:：

- (void)captureOutput:(AVCapturePhotoOutput *)output didFinishProcessingPhoto:(AVCapturePhoto *)photo error:(nullable NSError *)error
{  
  NSData *imageData = [photo fileDataRepresentation];
  UIImage *image = [UIImage imageWithData:data];
  ...
}