livoxG1: StagingBuff: add getClEngineIovec

stimBuffApis/livoxGen1/stagingBuffer.h

@@ -106,6 +106,18 @@ public:
 		return iov;
 	}
 
+	/**	EXPLANATION:
+	 * Returns an iovec for OpenCL engine buffer access.
+	 * The buffer is mmap()-allocated and suitable for CL_MEM_USE_HOST_PTR.
+	 */
+	struct iovec getClEngineIovec() const
+	{
+		struct iovec iov;
+		iov.iov_base = buffer.get();
+		iov.iov_len = bufferNBytes;
+		return iov;
+	}
+
 	inline std::string stringify() const
 	{
 		std::ostringstream oss;