Ios CoreVideo/iSurface:未知像素格式
我尝试使用Ios CoreVideo/iSurface:未知像素格式,ios,core-video,iosurface,Ios,Core Video,Iosurface,我尝试使用CVPixelBufferCreateWithIOSurface和从IOSurfaceGetBaseAddressOfPlane读取像素来捕获IOSurface 但是,在较新的设备(iPhone XS)上,我得到了一个未知的像素格式&wq2(再次使用IOSurfaceGetPixelFormat和cvpixelbuffergetpixelformatype) CVPixelFormatDescriptionCreateWithPixelFormatType返回以下内容: @"{\n
CVPixelBufferCreateWithIOSurface
和从IOSurfaceGetBaseAddressOfPlane
读取像素来捕获IOSurface
但是,在较新的设备(iPhone XS)上,我得到了一个未知的像素格式&wq2
(再次使用IOSurfaceGetPixelFormat
和cvpixelbuffergetpixelformatype
)
CVPixelFormatDescriptionCreateWithPixelFormatType
返回以下内容:
@"{\n BitsPerComponent = 10;\n ComponentRange = FullRange;\n ContainsAlpha = 1;\n ContainsGrayscale = 0;\n ContainsRGB = 1;\n ContainsYCbCr = 0;\n PixelFormat = 645346401;\n Planes = (\n {\n BitsPerBlock = 64;\n CompressionType = 2;\n TileHeight = 16;\n TileWidth = 16;\n }\n );\n}"
我的代码在较旧的设备上运行得很好(它以像素格式返回
BGRA
),但在我假设的较新设备上出现故障。如何从这种未记录的格式中解组像素。我有一个回答自己问题的坏习惯
要将此IOSurface
转换为具有已知像素类型的IOSurface
,应使用IOAccelerator
CFMutableDictionary dict = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);;
char pixelFormat[4] = {'A', 'R', 'G', 'B'};
CFDictionarySetValue(dict, kIOSurfaceBytesPerRow, CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &bytesPerRow));
CFDictionarySetValue(dict, kIOSurfaceBytesPerElement, CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &bytesPerElement));
CFDictionarySetValue(dict, kIOSurfaceWidth, CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &width));
CFDictionarySetValue(dict, kIOSurfaceHeight, CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &height));
CFDictionarySetValue(dict, kIOSurfacePixelFormat, CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, pixelFormat));
CFDictionarySetValue(dict, kIOSurfaceAllocSize, CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &bufferSize));
IOSurfaceRef surface = IOSurfaceCreate(dict);
auto const didCreateAccelerator = IOSurfaceAcceleratorCreate(kCFAllocatorDefault, 0, &accelerator);