将照片保存到相机胶卷时,AVCaptureMovieFileOutput导致方向错误

Question

我对captureStillImageAsynchronouslyFromConnection有一个奇怪的问题.如果在镜像视频时使用jpegStillImageNSDataRepresentation保存图像,则相机胶卷中的图像顺时针旋转90度.但是,如果它没有镜像,则方向很好.我会发布代码,其他人有这个问题/知道修复？

更新:刚刚运行了一些测试,高度和宽度(640x480)很好,反映了设备的方向.当我以肖像拍照时,它会报告UIImageOrientationLeft并在镜像时报告UIImageOrientationLeftMirrored.

更新2:当我在相机胶卷中查看已保存的照片时,图像预览的方向正确,在照片之间滑动时图像也是如此,但是当照片完全加载时,它会旋转90度.这可能是相机胶卷问题吗？(我在4.3.3)

- (void) captureImageAndSaveToCameraRoll
{
    AVCaptureConnection *stillImageConnection = [AVCamUtilities connectionWithMediaType:AVMediaTypeVideo fromConnections:[[self stillImageOutput] connections]];
    if ([stillImageConnection isVideoOrientationSupported])
        [stillImageConnection setVideoOrientation:[self orientation]];

    [[self stillImageOutput] captureStillImageAsynchronouslyFromConnection:stillImageConnection
                                                         completionHandler:^(CMSampleBufferRef imageDataSampleBuffer, NSError *error) {

                                                             ALAssetsLibraryWriteImageCompletionBlock completionBlock = ^(NSURL *assetURL, NSError *error) {
                                                                 if (error) {
                                                                     if ([[self delegate] respondsToSelector:@selector(captureManager:didFailWithError:)]) {
                                                                         [[self delegate] captureManager:self didFailWithError:error];
                                                                     }
                                                                 }
                                                             };

                                                             if (imageDataSampleBuffer != NULL) {
                                                                 NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:imageDataSampleBuffer];
                                                                 ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

                                                                 UIImage *image = [[UIImage alloc] initWithData:imageData];
                                                                 [library writeImageToSavedPhotosAlbum:[image CGImage]
                                                                                           orientation:(ALAssetOrientation)[image imageOrientation]
                                                                                       completionBlock:completionBlock];
                                                                 [image release];

                                                                 [library release];
                                                             }
                                                             else
                                                                 completionBlock(nil, error);

                                                             if ([[self delegate] respondsToSelector:@selector(captureManagerStillImageCaptured:)]) {
                                                                 [[self delegate] captureManagerStillImageCaptured:self];
                                                             }
                                                         }];
}

Answer 1

我想知道您新创建的图像是否真的具有您在这里假设的方向设置：

[library writeImageToSavedPhotosAlbum:[image CGImage] orientation: (ALAssetOrientation) [image imageOrientation] completionBlock:completionBlock];

[image imageOrientation]特别是似乎可能是问题的根源，尤其是需要演员阵容......

你说你在某处看到图像方向，是在使用[image imageOrientation]以下命令创建之后不久的吗？

NSData *imageData = [AVCaptureStillImageOutput jpegStillImageNSDataRepresentation: imageDataSampleBuffer];
UIImage *image = [[UIImage alloc] initWithData:imageData];

我想知道您是否假设该元数据是imageData从AVCaptureStillImageOutput jpegStillImageNSDataRepresentation:实际上仅包含图像像素数据本身的情况返回的？