步驟：CMSampleBufferRef --->CVImageBufferRef--->CGImageRef--->UIImage

(UIImage *)convertSampleBufferToImage:(CMSampleBufferRef)sampleBuffer { //制作 CVImageBufferRef CVImageBufferRef buffer; buffer = CMSampleBufferGetImageBuffer(sampleBuffer);

CVPixelBufferLockBaseAddress(buffer, 0);

//從 CVImageBufferRef 取得影像的細部信息 uint8_t *base; size_t width, height, bytesPerRow; base = CVPixelBufferGetBaseAddress(buffer); width = CVPixelBufferGetWidth(buffer); height = CVPixelBufferGetHeight(buffer); bytesPerRow = CVPixelBufferGetBytesPerRow(buffer);

//利用取得影像細部信息格式化 CGContextRef CGColorSpaceRef colorSpace; CGContextRef cgContext; colorSpace = CGColorSpaceCreateDeviceRGB(); cgContext = CGBitmapContextCreate(base, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst); CGColorSpaceRelease(colorSpace);

//透過 CGImageRef 將 CGContextRef 轉換成 UIImage CGImageRef cgImage; UIImage *image; cgImage = CGBitmapContextCreateImage(cgContext); image = [UIImage imageWithCGImage:cgImage]; CGImageRelease(cgImage); CGContextRelease(cgContext);

CVPixelBufferUnlockBaseAddress(buffer, 0);

return image; }

總結

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