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Android NDK Native Activity: Problem using OpenCV

asked 2013-03-03 17:46:53 -0500

Dave gravatar image

updated 2013-03-03 17:49:51 -0500

Hello

I'm trying to use OpenCV VideoCapture in an Android NDK Native Activity. Unfortunately I can't find a tutorial for integrating OpenCV with Native Activity, so I was trying to discover a solution myself.

This is my Android.mk file:

LOCAL_PATH := $(call my-dir)
SELF_DIR := $(dir $(lastword $(MAKEFILE_LIST)))
OPENCV_SDK_DIR := $(SELF_DIR)/../../OpenCV-2.4.4-android-sdk

include $(CLEAR_VARS)
OPENCV_CAMERA_MODULES:=on
OPENCV_INSTALL_MODULES:=on
OPENCV_LIB_TYPE:=SHARED
include $(OPENCV_SDK_DIR)/sdk/native/jni/OpenCV.mk

LOCAL_MODULE    := CameraTest
LOCAL_SRC_FILES := AppEngine.cpp ConcreteApp.cpp main.cpp
LOCAL_LDLIBS    += -llog -landroid -lEGL -lGLESv1_CM
LOCAL_STATIC_LIBRARIES += android_native_app_glue
include $(BUILD_SHARED_LIBRARY)

$(call import-module,android/native_app_glue)

The problem is that the app is only starting, when I do static linking of OpenCV with OPENCV_LIB_TYPE := STATIC. With dynamic linking, the app doesn't even start and I get the following exception:

03-04 00:19:39.880: E/AndroidRuntime(3667): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.cameratest/android.app.NativeActivity}: java.lang.IllegalArgumentException: Unable to load native library: /data/data/com.example.cameratest/lib/libCameraTest.so

I actually wouldn't mind static linking, but I discovered other problems with this method: The video capture doesn't seem to work. I tried the camera examples in the samples folder of the OpenCV Android SDK and they all work. So the problem seems to be on my side.

As I said, the video capture doesn't work when linking statically. I get the following log messages:

03-04 00:26:59.090: D/OpenCV::camera(3818): CvCapture_Android::CvCapture_Android(0)
03-04 00:26:59.090: D/OpenCV::camera(3818): Library name: libCameraTest.so
03-04 00:26:59.090: D/OpenCV::camera(3818): Library base address: 0x80400000
03-04 00:26:59.100: D/OpenCV::camera(3818): Libraries folder found: /data/data/ch.bfh.cpvr.cameratest/lib/
03-04 00:26:59.100: D/OpenCV::camera(3818): CameraWrapperConnector::connectToLib: folderPath=/data/data/ch.bfh.cpvr.cameratest/lib/
03-04 00:26:59.100: E/OpenCV::camera(3818): ||libnative_camera_r4.2.0.so
03-04 00:26:59.100: E/OpenCV::camera(3818): ||libnative_camera_r3.0.1.so
03-04 00:26:59.100: E/OpenCV::camera(3818): ||libnative_camera_r2.3.3.so
03-04 00:26:59.100: E/OpenCV::camera(3818): ||libnative_camera_r2.2.0.so
03-04 00:26:59.100: E/OpenCV::camera(3818): ||libnative_camera_r4.0.3.so
03-04 00:26:59.100: E/OpenCV::camera(3818): ||libnative_camera_r4.1.1.so
03-04 00:26:59.100: E/OpenCV::camera(3818): ||libnative_camera_r4.0.0.so
03-04 00:26:59.100: D/OpenCV::camera(3818): try to load library 'libnative_camera_r4.2.0.so'
03-04 00:26:59.110: D/OpenCV::camera(3818): CameraWrapperConnector::connectToLib ERROR: cannot dlopen camera wrapper library /data/data/ch.bfh.cpvr.cameratest/lib/libnative_camera_r4.2.0.so, dlerror="Cannot load library: reloc_library[1311]:  1386 cannot locate '_ZN7android11BufferQueueC1EbRKNS_2spINS_19IGraphicBufferAllocEEE'...
03-04 00:26:59.110: D/OpenCV::camera(3818): "
03-04 00:26:59.110: D/OpenCV::camera(3818): try to load library 'libnative_camera_r4.1.1.so'
03-04 00:26:59.110: D/OpenCV::camera(3818): CameraWrapperConnector::connectToLib ERROR: cannot dlopen camera wrapper library /data/data/ch.bfh ...
(more)
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answered 2013-03-04 00:26:56 -0500

The reason of your application failure is linking with native OpenCV libraries in run time. There is the same question here. See Stackoverflow thread for the solution.

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Asked: 2013-03-03 17:46:53 -0500

Seen: 6,137 times

Last updated: Mar 04 '13