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NV12 转YV12

Y部分直接拷贝; YV12:     NV12:   NV转YV12的UV部分 for (int i = 0; i < H/2; i++) { for (int j = 0; j < W/2; j++) { vBuffer[i * W/2 + j] = nv_uvBuf[i * UVDataPerRow + 2 * j + 1]; //v uBuffer[i * W/2 + j] = n