Problems with opencv libraries

gmv · Postby **gmv** » 31 Jul 2013 11:57

Hi,
I'm working with VLC for Android, and i've compiled it to get a project in Eclipse.
I'm trying to develope a new module which it uses the header files of opencv.

I've implemented a .c program in the folder home/virginia/workspace/android/vlc/input and its header file.
In the begining of the program, i've included the next headers:

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#include <opencv2/core/core_c.h>
#include <opencv2/imgproc/imgproc_c.h>
#include <opencv2/imgproc/types_c.h>
#include <opencv2/highgui/highgui_c.h>
#include <opencv2/photo/photo_c.h>

But i'm not sure where to indicate to the compiler that the libraries and the headers file are located. I've included the next instructions in the configure.sh file (home/virginia/workspace/android/configure.sh):

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CPPFLAGS="-I${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++${CXXSTL}/include -I${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++${CXXSTL}/libs/${ANDROID_ABI}/include -I/home/virginia/workspace/OpenCV-2.4.5-android-sdk/sdk/native/jni/include "
LDFLAGS="$LDFLAGS -L${ANDROID_NDK}/sources/cxx-stl/gnu-libstdc++${CXXSTL}/libs/${ANDROID_ABI} -L/home/virginia/workspace/OpenCV-2.4.5-android-sdk/sdk/native/libs/${ANDROID_ABI}"

So the headers are located in the next path: home/virginia/workspace/OpenCV-2.4.5-android-sdk/sdk/native/jni/include in the folders opencv and opencv2 and the libraries (.so and .a) are located in the next path:/home/virginia/workspace/OpenCV-2.4.5-android-sdk/sdk/native/libs/${ANDROID_ABI}

The errors that i'm getting are :

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/home/virginia/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function virtualJNI:../../src/input/virtual.c:103: error: undefined reference to 'cvGetSize'
/home/virginia/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function virtualJNI:../../src/input/virtual.c:103: error: undefined reference to 'cvCreateImage'
/home/virginia/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function virtualJNI:../../src/input/virtual.c:103: error: undefined reference to 'cvCloneImage'

I know that it's a problem related with to link libraries, but i don't know that file or files i must modify.

Thanks for the help!

Postby **Jean-Baptiste Kempf** » 31 Jul 2013 16:32

You're missing the -l option in the Android.mk

gmv · Postby **gmv** » 01 Aug 2013 04:07

Ok, thanks!

But i have got some problems yet.

I've downloaded the code again . Then, i've implemented a .cpp program in the next path: home/virginia/android/vlc/src/input/virtual.cpp

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/*
*  virtual.cpp
*/
#include <stdlib.h>

#include <jni.h>
#include <math.h>

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/imgproc/types_c.h>
#include <opencv2/highgui/highgui_c.h>
#include <opencv2/photo/photo.hpp>

#include <android/log.h>

extern "C" {
	#include "virtual.h"
}
#define  LOG_TAG    "VLC - Imagen 3D -  JNI"
#define  LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
#define  LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)

using namespace cv;
using namespace std;

extern "C" int camino(void){... }

This programs calls to the opencv functions.

virtual.h ( home/virginia/android/vlc/src/input/virtual.h)
/*
* virtual.h
*/

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#ifndef __VIRTUAL_H
#define __VIRTUAL_H

int camino(void);

#endif /*__VIRTUAL_H*/

And Android.mk ( home/virginia/android/vlc-android/jni/Android.mk) file:

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include $(CLEAR_VARS)

OPENCV_LIB_TYPE:=STATIC
OPENCV_INSTALL_MODULES:=on

include /home/virginia/workspace/OpenCV-2.4.5-android-sdk/sdk/native/jni/OpenCV.mk
include $(OPENCV_MK_PATH)

LOCAL_MODULE    := virtual
LOCAL_SRC_FILES := ../../vlc/src/input/virtual.cpp


LOCAL_C_INCLUDES := \
	$(ANDROID_NDK)/platforms/android-8/arch-arm/usr/include \
	$(ANDROID_NDK)/platforms/android-8/arch-arm/usr/include/android \
	/home/virginia/workspace/OpenCV-2.4.5-android-sdk/sdk/native/jni/include \
	$(VLC_SRC_DIR)/include \
	
LOCAL_LDLIBS := -L/home/virginia/workspace/OpenCV-2.4.5-android-sdk/sdk/native/libs/$(ANDROID_ABI) \
	-lopencv_highgui -lopencv_imgproc -lopencv_photo -lopencv_core \
	$(CPP_STATIC)

include $(BUILD_SHARED_LIBRARY)
...

and Application.mk:

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APP_PLATFORM := android-9
APP_ABI := $(ANDROID_ABI)
NDK_TOOLCHAIN_VERSION=4.6

APP_STL := gnustl_static

APP_MODULES := vlcjni iomx-gingerbread iomx-hc iomx-ics virtual

But the problem is that i need to call to "camino" function from decoder.c (( home/virginia/android/vlc/src/input/decoder.c):

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#include "virtual.h"

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>

...
static void DecoderPlayVideo( decoder_t *p_dec, picture_t *p_picture,
                              int *pi_played_sum, int *pi_lost_sum ){

...
            int res = camino();
            msg_Warn( p_dec, "Llamada a virtualJNI devuelve %d", &res );
            vout_PutPicture( p_vout, p_picture );
...
}
...

I'm getting the next error:

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SharedLibrary  : libvlcjni.so
/home/virginia/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(decoder.o): in function DecoderDecodeVideo:../../src/input/decoder.c:1501: error: undefined reference to 'camino'
collect2: ld returned 1 exit status
make[1]: *** [obj/local/armeabi-v7a/libvlcjni.so] Error 1
make[1]: Leaving directory `/home/virginia/android/vlc-android'
make: *** [vlc-android/obj/local/armeabi-v7a/libvlcjni.so] Error 2

Thanks so much!

rakhilkt · Postby **rakhilkt** » 01 Aug 2013 08:05

I don't know much on Android, But is comfortable with OpenCV programming

For compiling a OpenCV program you need to add the following while compiling:
Include the path :
-I/usr/local/include/opencv -I/usr/local/include

Include the shared libraries needed :
/usr/local/lib/libopencv_calib3d.so /usr/local/lib/libopencv_contrib.so /usr/local/lib/libopencv_core.so /usr/local/lib/libopencv_features2d.so /usr/local/lib/libopencv_flann.so /usr/local/lib/libopencv_gpu.so /usr/local/lib/libopencv_highgui.so /usr/local/lib/libopencv_imgproc.so /usr/local/lib/libopencv_legacy.so /usr/local/lib/libopencv_ml.so /usr/local/lib/libopencv_nonfree.so /usr/local/lib/libopencv_objdetect.so /usr/local/lib/libopencv_photo.so /usr/local/lib/libopencv_stitching.so /usr/local/lib/libopencv_superres.so /usr/local/lib/libopencv_ts.so /usr/local/lib/libopencv_video.so /usr/local/lib/libopencv_videostab.so

Or it is enough that you can just compile it using -->
`pkg-config --libs opencv` and `pkg-config --cflags opencv`
Eg :
g++ opencv_file.cpp `pkg-config --libs opencv` `pkg-config --cflags opencv` -o opencv_executable

If you try 'echo' command along with the above tag in the command line you can see the the above includes and shared libraries.

gmv · Postby **gmv** » 03 Sep 2013 13:12

Thanks!

I know that the file must be compiled so:
g++ opencv_file.cpp `pkg-config --libs opencv` `pkg-config --cflags opencv` -o opencv_executable

But it is a big project and the compilation of the files isn't written for each file explicitly, one by one.

I have got this in the Android.mk file:

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LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

OPENCV_LIB_TYPE:=STATIC
OPENCV_INSTALL_MODULES:=on

include /home/vmg/workspace/OpenCV-2.4.5-android-sdk/sdk/native/jni/OpenCV.mk
include $(OPENCV_MK_PATH)

LOCAL_MODULE    := virtual
LOCAL_SRC_FILES := ../../vlc/src/input/virtual.cpp


LOCAL_C_INCLUDES := \
   $(ANDROID_NDK)/platforms/android-8/arch-arm/usr/include \
   $(ANDROID_NDK)/platforms/android-8/arch-arm/usr/include/android \
   /home/vmg/workspace/OpenCV-2.4.5-android-sdk/sdk/native/jni/include \
   $(VLC_SRC_DIR)/include \
   
LOCAL_LDLIBS := -L/home/vmg/workspace/OpenCV-2.4.5-android-sdk/sdk/native/libs/$(ANDROID_ABI) \
   -L/usr/lib \
   -lopencv_highgui -lopencv_imgproc -lopencv_photo -lopencv_core \
   $(CPP_STATIC)

include $(BUILD_SHARED_LIBRARY)

And in home/vmg/workspace/OpenCV-2.4.5-android-sdk/sdk/native/libs/armeabi-v7a, there are the next libraries:

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vmg@bakio:~/workspace/OpenCV-2.4.5-android-sdk/sdk/native/libs/armeabi-v7a$ ls
libnative_camera_r2.2.0.so  libopencv_contrib.a     libopencv_ml.a
libnative_camera_r2.3.3.so  libopencv_core.a        libopencv_objdetect.a
libnative_camera_r3.0.1.so  libopencv_features2d.a  libopencv_photo.a
libnative_camera_r4.0.0.so  libopencv_flann.a       libopencv_stitching.a
libnative_camera_r4.0.3.so  libopencv_highgui.a     libopencv_ts.a
libnative_camera_r4.1.1.so  libopencv_imgproc.a     libopencv_video.a
libnative_camera_r4.2.0.so  libopencv_info.so       libopencv_videostab.a
libopencv_androidcamera.a   libopencv_java.so
libopencv_calib3d.a         libopencv_legacy.a

I don't know because i get the error:

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/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function camino:../../src/input/virtual.cpp:294: error: undefined reference to 'cv::Mat::operator _IplImage() const'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function camino:../../src/input/virtual.cpp:294: error: undefined reference to 'cvGetSize'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function camino:../../src/input/virtual.cpp:294: error: undefined reference to 'cvCreateImage'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function camino:../../src/input/virtual.cpp:294: error: undefined reference to 'cvCloneImage'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function camino:../../src/input/virtual.cpp:294: error: undefined reference to 'cvSmooth'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function camino:../../src/input/virtual.cpp:413: error: undefined reference to 'cvSplit'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function camino:../../src/input/virtual.cpp:413: error: undefined reference to 'cvMerge'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function camino:../../src/input/virtual.cpp:413: error: undefined reference to 'cvInpaint'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function camino:../../src/input/virtual.cpp:413: error: undefined reference to 'cvCvtColor'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function camino:../../src/input/virtual.cpp:413: error: undefined reference to 'cvReleaseImage'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function camino:../../src/input/virtual.cpp:413: error: undefined reference to 'cv::fastFree(void*)'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function camino:../../src/input/virtual.cpp:413: error: undefined reference to 'cv::Mat::deallocate()'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function cv::Mat::~Mat():../../include/opencv2/core/mat.hpp:382: error: undefined reference to 'cv::fastFree(void*)'
/home/vmg/android/android-ndk-r8c/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ../vlc/android/src/.libs/libvlccore.a(virtual.o): in function cv::Mat::~Mat():../../include/opencv2/core/mat.hpp:382: error: undefined reference to 'cv::Mat::deallocate()'

The virtual.cpp file doesn't include JNI code, I don't know if this script must include JNI code to include it in the Android.mk file.

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