I'm trying to call C++ method in Java coding.
I received the Android NDK : Aborting. Stop when defined the Android.mk file as below :
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := libs/ffmpeg.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := ffmpeg.cpp
LOCAL_SHARED_LIBRARIES := ffmpeg
include $(BUILD_SHARED_LIBRARY)
But if I defined like this, it run successfully :
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := libs/ffmpeg.so
include $(BUILD_SHARED_LIBRARY)
Questions :
1 - How to fix this error?
2 - In Android.mk file, Can not call libs/ffmpeg.so and ffmpeg.cpp in the same time?
People who know this,
Please tell me,
Thanks,
p/s : Project structure :
When seeing the Android.mk structure.
I think I need change Android.mk file like this :
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg
LOCAL_SRC_FILES := libs/ffmpeg.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := final_ffmpeg
LOCAL_SRC_FILES := ffmpeg.cpp
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog
LOCAL_PREBUILTS := libs/ffmpeg.so
#libavformat libavcodec libswscale libavutil
include $(BUILD_SHARED_LIBRARY)
The result will help me :
It still be exactly when you need call the C++ function in C++ file from Java file.
Related
I'm trying to use FFMPEG to crop a video using the Android NDK. I can successfully build ffmpeg, but I'm having problems with libavfilter. As soon as I include it in my LOCAL_SHARED_LIBRARIES in Android.mk, then I get this UnsatisfiedLinkError:
java.lang.UnsatisfiedLinkError: dlopen failed: could not load library "libavfilter.so" needed by "videocrop.so"; caused by cannot locate symbol "avcodec_find_best_pix_fmt_of_2" referenced by "libavfilter.so"...
at java.lang.Runtime.loadLibrary(Runtime.java:371)
at java.lang.System.loadLibrary(System.java:989)
(I'm trying to load my library in a static initializer on the Java side with System.loadLibrary).
The "avcodec_find_best_pix_fmt_of_2" function exists in libavcodec/avcodec.h, so I don't know why it can't locate it. The libavfilter.so file (as well as all the other libraries) seems to be building just fine and is located in the libs/ folder. I've tried editing the FFMPEG configuration and rebuilding, and also tried changing the the LOCAL_C_INCLUDES in Android.mk to include libavcodec's header files, but no luck with anything.
Here's my Android.mk for my module:
LOCAL_PATH:= $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := videocrop
LOCAL_CFLAGS :=
LOCAL_SRC_FILES := VideoCrop.c
LOCAL_C_INCLUDES += $(LOCAL_PATH)/../ffmpeg/ffmpeg/$(TARGET_ARCH)/include/libavcodec/
LOCAL_SHARED_LIBRARIES := libavformat libavutil libavcodec libavfilter
LOCAL_LDLIBS := -llog
LOCAL_LDFLAGS +=-ljnigraphics
include $(BUILD_SHARED_LIBRARY)
And here's my Android.mk for the ffmpeg libraries themselves, although its pretty straightforward:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := libavfilter
LOCAL_SRC_FILES := ffmpeg/$(TARGET_ARCH_ABI)/lib/$(LOCAL_MODULE).so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/ffmpeg/$(TARGET_ARCH_ABI)/include
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := libswscale
LOCAL_SRC_FILES := ffmpeg/$(TARGET_ARCH_ABI)/lib/$(LOCAL_MODULE).so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/ffmpeg/$(TARGET_ARCH_ABI)/include
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := libavcodec
LOCAL_SRC_FILES := ffmpeg/$(TARGET_ARCH_ABI)/lib/$(LOCAL_MODULE).so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/ffmpeg/$(TARGET_ARCH_ABI)/include
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := libavformat
LOCAL_SRC_FILES := ffmpeg/$(TARGET_ARCH_ABI)/lib/$(LOCAL_MODULE).so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/ffmpeg/$(TARGET_ARCH_ABI)/include
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := libavutil
LOCAL_SRC_FILES := ffmpeg/$(TARGET_ARCH_ABI)/lib/$(LOCAL_MODULE).so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/ffmpeg/$(TARGET_ARCH_ABI)/include
include $(PREBUILT_SHARED_LIBRARY)
LOCAL_PATH:= $(call my-dir)
I'm at wit's end. If anyone has any ideas it would be much appreciated.
You need to load the libraries in reverse dependency order, e.g. like this:
System.loadLibrary("avutil");
System.loadLibrary("avcodec");
System.loadLibrary("avformat");
System.loadLibrary("swscale");
System.loadLibrary("avfilter");
System.loadLibrary("videocrop");
See e.g. this post for more details: Loading shared libs that depend on other shared libs
I have an Android.mk file that has a number of files for which LOCAL_CFLAGS get applied to them. I would like to apply a different flag to only one of the files out of the many. How can this be accomplished?
I searched the internet from the Android perspective, but didn't find a whole lot. Considering the following example I would like to apply flag TEST3 to file test3.c only. I looked at Per-file CPPFLAGS in Android.mk, but I couldn't find anything as far as how to use PRIVATE_CPPFLAGS to one file. Any ideas?
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := test
LOCAL_SRC_FILES := test1.c test2.c test3.c
LOCAL_CFLAGS := -DTEST1_2_AND_3
include $(BUILD_SHARED_LIBRARY)
The supported way to achieve your goal is to use a separate static library for C/CPP files that need different parameters. In this particular case, the fix would be as easy as
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := test3
LOCAL_SRC_FILES := test3.c
LOCAL_CFLAGS := -DTEST1_2_AND_3 -DTEST3
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := test
LOCAL_SRC_FILES := test1.c test2.c
LOCAL_CFLAGS := -DTEST1_2_AND_3
LOCAL_WHOLE_STATIC_LIBRARIES := test3
include $(BUILD_SHARED_LIBRARY)
There is another approach, similar to one I forged a while ago
LOCAL_PATH := $(call my-dir)
TARGET-process-src-files-tags += $(call add-src-files-target-cflags, $(LOCAL_TEST3_SRC_FILES), $(LOCAL_TEST3_CFLAGS))
include $(CLEAR_VARS)
LOCAL_MODULE := test
LOCAL_SRC_FILES := test1.c test2.c test3.c
LOCAL_CFLAGS := -DTEST1_2_AND_3
LOCAL_TEST3_SRC_FILES := test3.c
LOCAL_TEST3_CFLAGS := -DTEST3
include $(BUILD_SHARED_LIBRARY)
If -Dtest3 would do, you can use another hack:
LOCAL_PATH := $(call my-dir)
get-src-file-target-cflags = $(LOCAL_SRC_FILES_TARGET_CFLAGS.$1) -D$(basename $1)_DEFINE
include $(CLEAR_VARS)
LOCAL_MODULE := test
LOCAL_SRC_FILES := test1.c test2.c test3.c
LOCAL_CFLAGS := -DTEST1_2_AND_3
include $(BUILD_SHARED_LIBRARY)
See more in How to dynamically get the current compiler target file name in Android.mk's LOCAL_CFLAGS?.
I want to build an shared library. To build it, I need to call another shared library. Here is what I did:
1.Create one Android project,named "BuildLib",and add a new folder "jni" under the project directory. Contents of jni folder:
jni-->Android.mk
-->Application.mk
-->add.cpp
-->add.h add.cpp just do two numbers addition:
add.h:
int add(int a,int b);
add.cpp:
#include "add.h"
int add(int a,int b){
return a+b;}
Android.mk:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := add.cpp
LOCAL_MODULE := add
include $(BUILD_SHARED_LIBRARY)
After build the project,I got libadd.so under directory $(BUILDLIB)/libs/armeabi/.
Create another Android project, named "CallLib". Copy libadd.so and add.h to jni folder, create Android.mk, Application.mk, and call_add.cpp.
Android.mk:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := libadd.so
LOCAL_MODULE := add_prebuilt
include $(PREBUILD_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_C_INCLUDES := $(LOCAL_PATH）
LOCAL_SRC_FILES := call_add.cpp
LOCAL_MODULE := native
LOCAL_SHARED_LIBRARIES := add_prebuilt
include $(BUILD_SHARED_LIBRARY)
call_add.cpp:
#include "add.h"
int call_add(){return add(1,2);}
After all above, I build the CallLib project, but got the error:
undefined reference to 'add(int, int)';
I think the libadd.so can not be found, but I don't know how to modify. Does anyone know how I can fix this? Any help will be appreciated.
In your second Android.mk, try replacing the first module with:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_SRC_FILES := libadd.so
LOCAL_MODULE := add_prebuilt
LOCAL_EXPORT_C_INCLUDES := add.h
include $(PREBUILD_SHARED_LIBRARY)
The LOCAL_EXPORT_C_INCLUDES flag should attach the header information to the add_prebuilt module, so it can be linked with your final library.
Just in case anyone needs it:
A bit hackish way to keep the linker happy:
LOCAL_LDLIBS := -llog
or
LOCAL_LDLIBS := -L$(LOCAL_PATH)/lib -lMyStuff
Less hackish:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := xyz
LOCAL_SRC_FILES += xyz/xyz.c
LOCAL_LDLIBS := -llog
include $(BUILD_SHARED_LIBRARY) # this builds libxyz.so
include $(CLEAR_VARS)
LOCAL_MODULE := abc
LOCAL_SHARED_LIBRARIES := xyz # <=== !!! this makes libabc.so dependent on libxyz.so
LOCAL_SRC_FILES := abc/abc.c
#LOCAL_LDLIBS := ...
include $(BUILD_SHARED_LIBRARY) # this builds libabc.so
Is this the correct format to specify the Android.mk?Is there any syntax errors? I couldnt find any source for clearing this doubt.Thanking you in advance.
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := imageprocessing
LOCAL_SRC_FILES := imageprocessing.c
LOCAL_LDLIBS := -lm -llog -ljnigraphics
include $(BUILD_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := libfreeimage
LOCAL_SRC_FILES := libfreeimage.so
include $(PREBUILT_SHARED_LIBRARY)
and in the C code have
#include <android/libfreeimage.h>
since u r creating a shared library from an existing shared library: So u need to first give the pre-built shared library part first then u can create ur own library. so ur code should look like this:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := libfreeimage
LOCAL_SRC_FILES := libfreeimage.so
include $(PREBUILT_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := imageprocessing
LOCAL_SRC_FILES := imageprocessing.c
LOCAL_LDLIBS := -lm -llog -ljnigraphics
include $(BUILD_SHARED_LIBRARY)
Well,
I got the solution from
http://www.kandroid.org/ndk/docs/PREBUILTS.html
Thank you for your valuable time Subrat nayak,thanks a lot
i'm wrapping a native API to Android by NDK.
But when building it don't find the header files.
I have the following structure.
project/jni
Android.mk
LOCAL_PATH := $(call my-dir)
include $(call all-subdir-makefiles)
LOCAL_PATH :=/home/marcos/dev/workspace/rmsdk.native.wraper/jni
include $(CLEAR_VARS)
LOCAL_LDLIBS := -llog
LOCAL_MODULE := ndk1
LOCAL_SRC_FILES := native.c DelegateDRMProcessorClient.cpp
LOCAL_STATIC_LIBRARY := adept cryptopenssl dp expat fonts hobbes jpeg mschema png t3 xml zlib
include $(BUILD_SHARED_LIBRARY)
project/jni/prereqs/
Android.mk (Used to call all subdirs Android.mk files)
LOCAL_PATH := $(call my-dir)
include $(call all-subdir-makefiles)
include $(CLEAR_VARS)
project/jni/prereqs/%lib%/
Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE :=dp
LOCAL_SRC_FILES :=libdp.a
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
include $(PREBUILT_STATIC_LIBRARY)
And there's a include folder on each %lib% folder.
When using ndk-build I get a
"/home/marcos/dev/workspace/rmsdk.native.wraper/jni/DelegateDRMProcessorClient.h:18:20: error: dp_all.h: No such file or directory"
Anyone knows how to include these header to be available to the compiler?
I solve it, getting all the headers in a folder and including the following line in the Android.mk
LOCAL_C_INCLUDES := $(LOCAL_PATH)/include-all
This works, but not looks like the best approach.
I'm a bit late to this party, but ran into the same issue and might have an answer for your comment:
"This works, but not looks like the best approach"
There;s a sample in the NDK called "module-exports"
It shows how to construct an Android.mk file which respects header files living in their proper directories and not all dumped into a single include directory.
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := foo
LOCAL_SRC_FILES := foo/foo.c
LOCAL_CFLAGS := -DFOO=2
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/foo
LOCAL_EXPORT_CFLAGS := -DFOO=1
LOCAL_EXPORT_LDLIBS := -llog
include $(BUILD_STATIC_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := bar
LOCAL_SRC_FILES := bar/bar.c
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/bar
LOCAL_STATIC_LIBRARIES := foo
include $(BUILD_SHARED_LIBRARY)
include $(CLEAR_VARS)
LOCAL_MODULE := zoo
LOCAL_SRC_FILES := zoo/zoo.c
LOCAL_SHARED_LIBRARIES := bar
include $(BUILD_SHARED_LIBRARY)
Years later...
To export the include directory instead of individual files, I use the following:
LOCAL_EXPORT_C_INCLUDE_DIRS := $(MY_DIRECTORY_PATH)
For example, for the above question the export for "foo" would look like:
LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/foo
For new people's convenience, I just want to add that move all your header files in folder which is referred by LOCAL_C_INCLUDES := $(LOCAL_PATH) and then save android.mk and restart eclipse. After trying all the above solutions, that worked for me.