objective-c: cv::Mat to CVPixelBuffer

// 导入相关的头文件
#import <CoreVideo/CoreVideo.h>
#import <opencv2/opencv.hpp>

// 将cv::Mat转换为CVPixelBuffer
- (CVPixelBufferRef)convertMatToPixelBuffer:(cv::Mat&)mat {
    // 创建CVPixelBuffer的属性
    NSDictionary* options = @{
        (NSString*)kCVPixelBufferCGImageCompatibilityKey: @YES,
        (NSString*)kCVPixelBufferCGBitmapContextCompatibilityKey: @YES
    };
    
    // 创建CVPixelBuffer
    CVPixelBufferRef pixelBuffer;
    CVPixelBufferCreate(kCFAllocatorDefault, mat.cols, mat.rows, kCVPixelFormatType_32BGRA, (__bridge CFDictionaryRef)options, &pixelBuffer);
    
    // 锁定CVPixelBuffer的基地址
    CVPixelBufferLockBaseAddress(pixelBuffer, 0);
    
    // 获取指向像素数据的指针
    void* baseAddress = CVPixelBufferGetBaseAddress(pixelBuffer);
    
    // 将cv::Mat中的像素数据复制到CVPixelBuffer中
    memcpy(baseAddress, mat.data, mat.total() * mat.elemSize());
    
    // 解锁CVPixelBuffer
    CVPixelBufferUnlockBaseAddress(pixelBuffer, 0);
    
    return pixelBuffer;
}