使用AVCaptureSessionPresetPhoto时，来自CMSampleBufferRef的损坏的cv：Mat

Question

我正在使用此代码从CMSampleBufferRef创建一个cv :: Mat。它适用于AVCaptureSessionPreset（高，中，低），但是当我使用AVCaptureSessionPresetPhoto时，它会输出一个乱码图像。

- (cv::Mat) matFromSampleBuffer:(CMSampleBufferRef) sampleBuffer {
    CVImageBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);

    CVPixelBufferLockBaseAddress( pixelBuffer, 0 );

    int bufferWidth = CVPixelBufferGetWidth(pixelBuffer);
    int bufferHeight = CVPixelBufferGetHeight(pixelBuffer);
    unsigned char *pixel = (unsigned char *)CVPixelBufferGetBaseAddress(pixelBuffer);

    cv::Mat mat(bufferHeight,bufferWidth,CV_8UC4,pixel);

    CVPixelBufferUnlockBaseAddress( pixelBuffer, 0 );

    return mat;
}

当我使用AVCaptureSessionPresetPhoto时，它会产生：

但是其他配置文件创建了一个cv：Mat就好了。有人可以帮忙吗？

Answer 1

解决了，我错过了以字节为单位的步长：

- (cv::Mat) matFromSampleBuffer:(CMSampleBufferRef) sampleBuffer {
    CVImageBufferRef pixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);

    CVPixelBufferLockBaseAddress( pixelBuffer, 0 );

    int bufferWidth = CVPixelBufferGetWidth(pixelBuffer);
    int bufferHeight = CVPixelBufferGetHeight(pixelBuffer);
    int bytesPerRow = CVPixelBufferGetBytesPerRow(pixelBuffer);
    unsigned char *pixel = (unsigned char *)CVPixelBufferGetBaseAddress(pixelBuffer);

    cv::Mat mat(bufferHeight,bufferWidth,CV_8UC4,pixel,bytesPerRow);

    CVPixelBufferUnlockBaseAddress( pixelBuffer, 0 );

    return mat;
}