setPreviewCallbackWithBuffer  670 applications/osmo4_android_studio/app/src/main/java/com/gpac/Osmo4/Preview.java 	                setPreviewCallbackWithBuffer(this);
setPreviewCallbackWithBuffer  681 applications/osmo4_android_studio/app/src/main/java/com/gpac/Osmo4/Preview.java 		            setPreviewCallbackWithBuffer(null);