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我在互联网上找到了一些代码:
- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer { NSLog(@"imageFromSampleBuffer: called"); // Get a CMSampleBuffer's Core Video image buffer for the media data CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); // Lock the base address of the pixel buffer CVPixelBufferLockBaseAddress(imageBuffer,0); // Get the number of bytes per row for the pixel buffer void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer); // Get the number of bytes per row for the pixel buffer size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer); // Get the pixel buffer width and height size_t width = CVPixelBufferGetWidth(imageBuffer); size_t height = CVPixelBufferGetHeight(imageBuffer); // Create a device-dependent RGB color space CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); // Create a bitmap graphics context with the sample buffer data CGContextRef context = CGBitmapContextCreate(baseAddress,width,height,8,bytesPerRow,colorSpace,kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst); // Create a Quartz image from the pixel data in the bitmap graphics context CGImageRef quartzImage = CGBitmapContextCreateImage(context); // Unlock the pixel buffer CVPixelBufferUnlockBaseAddress(imageBuffer,0); // Free up the context and color space CGContextRelease(context); CGColorSpaceRelease(colorSpacE); // Create an image object from the Quartz image UIImage *image = [UIImage imageWithCGImage:quartzImage]; // Release the Quartz image CGImageRelease(quartzImagE); return (imagE); }
但是我遇到了一些错误:
videoSettings
到一个
specifies the pixel format you want的字典,你需要设置为RGB的一些CGBitmapContext可以处理的变体.
文档有a list of all of the pixel formats that Core Video can process.CGBitmapContext只支持其中的一小部分.您在互联网上找到的代码所期望的格式是kCVPixelFormatType_32BGRA,但这可能是针对Macs-on iOS设备编写的,kCVPixelFormatType_32ARGB(big-endian)可能更快.在设备上尝试它们,并比较帧速率.
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