[英]Comparing two unsigned char buffers
我有两个CVImageBufferRef缓冲区,它们分别对应于AVCaptureSession依次获取的两个图像。 我想比较两者,看看是否所有像素都相同。 为了遍历帧缓冲区的所有像素并进行比较,我这样做:
unsigned char *pixelA = (unsigned char *)CVPixelBufferGetBaseAddress(pixelBufferA);
unsigned char *pixelB = (unsigned char *)CVPixelBufferGetBaseAddress(pixelBufferB);
- (BOOL) isBuffer:(unsigned char *)pixelA equalToBuffer:(unsigned char *)pixelB {
for( int row = 0; row < bufferHeight; row++ ) {
for( int column = 0; column < bufferWidth; column++ ) {
if ((pixelA[0] != pixelB[0]) ||
(pixelA[1] != pixelB[1]) ||
(pixelA[2] != pixelB[2]) ){
return NO;
// means at some point pixelA is not equal to pixelB, so
// pixelBufferA is not equal to pixelBufferB
}
pixelA += BYTES_PER_PIXEL;
pixelB += BYTES_PER_PIXEL;
}
}
// if the method reached here, pixelBufferA is equal to pixelBufferB, so
return YES; // are equal
}
显然,它在比较中崩溃了。 如何比较pixelA中的所有值与pixelB? 谢谢
我从来没有真正做过您正在做的事情,但是,有一个原因,您不能只与memcmp
一次性比较缓冲区吗?
- (BOOL) isBuffer:(unsigned char*)pixelA equalToBuffer:(unsigned char*)pixelB
{
size_t bufferSize = bufferWidth * bufferHeight * BYTES_PER_PIXEL;
return memcmp( pixelA, pixelB, bufferSize ) == 0;
}
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