private void InitARFrameBuffer()
{
mImage = new UnityARImageFrameData();
int yBufSize = mARCamera.videoParams.yWidth * mARCamera.videoParams.yHeight;
mImage.y.data = Marshal.AllocHGlobal(yBufSize);
mImage.y.width = (ulong)mARCamera.videoParams.yWidth;
mImage.y.height = (ulong)mARCamera.videoParams.yHeight;
mImage.y.stride = (ulong)mARCamera.videoParams.yWidth;
// This does assume the YUV_NV21 format
int vuBufSize = mARCamera.videoParams.yWidth * mARCamera.videoParams.yWidth / 2;
mImage.vu.data = Marshal.AllocHGlobal(vuBufSize);
mImage.vu.width = (ulong)mARCamera.videoParams.yWidth / 2;
mImage.vu.height = (ulong)mARCamera.videoParams.yHeight / 2;
mImage.vu.stride = (ulong)mARCamera.videoParams.yWidth;
mSession.SetCapturePixelData(true, mImage.y.data, mImage.vu.data);
}