1.

Y通道（Luminance）與 UV通道（Chrominance）分開填充資料，而且需要注意後者是UV交錯排列的。在填充資料時還需要考慮到資料對齊的問題，當視訊幀的寬高並不是某個對齊基數的倍數時（比如16），內部具體如何分配記憶體是不確定的，保險的做法就是逐行資料填充。這裡我放上填充Chrominance通道資料的例子：

size_t bytesPerRowChrominance = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, 1);

long chrominanceWidth = CVPixelBufferGetWidthOfPlane(pixelBuffer, 1);
long chrominanceHeight = CVPixelBufferGetHeightOfPlane(pixelBuffer, 1);

// Chrominance
uint8_t *uvDestPlane = (uint8_t *) CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 1);
memset(uvDestPlane, 0x80, chrominanceHeight * bytesPerRowChrominance);

for (int row = 0; row < chrominanceHeight; ++row) {
    memcpy(uvDestPlane + row * bytesPerRowChrominance,
            uvDataPtr + row * _outVideoWidth,
            _outVideoWidth);
}

free(uvDataPtr);
 



https://www.cnblogs.com/psklf/p/7700834.html