如何将CMSampleBuffer转换为std :: vector< char> ;? [英] How to convert CMSampleBuffer to std::vector<char>?
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问题描述
我的AVCaptureVideoDataOutputSampleBufferDelegate
方法具有图像流:
- (void)captureOutput:(AVCaptureOutput )captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection )connection;
然后我要使用sampleBuffer
并将其提供给C ++ openalrp
库,以识别哪个需要图像字节或原始像素数据.我应该使用什么功能以及如何将sampleBuffer
转换为合适的输入类型std::vector<char>
或unsigned char* pixelData
?
Then I want to take sampleBuffer
and provide it for C++ openalrp
library to recognize which takes image bytes or raw pixel data. What function should I use and how to convert sampleBuffer
to suitable input type, std::vector<char>
or unsigned char* pixelData
?
来自alpr.h
文件:
// Recognize from an image on disk
AlprResults recognize(std::string filepath);
// Recognize from byte data representing an encoded image (e.g., BMP, PNG, JPG, GIF etc).
AlprResults recognize(std::vector<char> imageBytes);
// Recognize from byte data representing an encoded image (e.g., BMP, PNG, JPG, GIF etc).
AlprResults recognize(std::vector<char> imageBytes, std::vector<AlprRegionOfInterest> regionsOfInterest);
// Recognize from raw pixel data.
AlprResults recognize(unsigned char* pixelData, int bytesPerPixel, int imgWidth, int imgHeight, std::vector<AlprRegionOfInterest> regionsOfInterest);
推荐答案
最后,我找到了答案:
CVPixelBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
CVPixelBufferLockBaseAddress(imageBuffer, 0);
unsigned char *tempAddress = (unsigned char *)CVPixelBufferGetBaseAddress(imageBuffer);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef newContext = CGBitmapContextCreate(tempAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
CGImageRef newImage = CGBitmapContextCreateImage(newContext);
CGContextRelease(newContext);
CGColorSpaceRelease(colorSpace);
UIImage *image = [UIImage imageWithCGImage:newImage];
NSData *data = UIImagePNGRepresentation(image);
if (data) {
unsigned long int len = data.length;
std::vector<char> v((char *)data.bytes, (char *)data.bytes + len);
alpr::AlprResults results = delegate->recognize(v);
}
CGImageRelease(newImage);
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