Build error with cygwin+NDKr4b about ffmpeg

[havlenapetr]

these two libs are wrappers to android native AudioTrack and surface flinger so they couldn't be build in ndk. So I have build them in android build system and copy them into my ffmpeg project. They are in libs dir, if you copy them into 'ndk_dir/out/apps/your_ffmpeg_project_name/ then ggc will link them corectlly'

[Seasky]

Thanks havlenapetr, as what you said, after I copy the two *.so files into \ffmpeg\obj\local\armeabi\objs\ dictory, this build error disappeared.

But I still meet a new problem as following:
$ $NDK/ndk-build
SharedLibrary : libffmpeg_jni.so
/cygdrive/c/android-ndk-r4b/samples/ffmpeg/obj/local/armeabi/objs/ffmpeg_jni/com_media_ffmpeg_FFMpegAVFormatContext.o: In function AVFormatContext_re lease': /cygdrive/c/android-ndk-r4b/samples/ffmpeg/jni/jni/com_media_ffmpeg_FFMpegAVFormatContext.c:85: undefined reference to__android_log_print'

I think this is because __android_log_print need external definition in android source code, but my build environment has only cygwin+NDK.

[havlenapetr]

sorry I don't know which branch are you building? Try debug branch and __android_log_print is defined in liblog.so which is in NDK, you can see this linkage in my Makefiles (LOCAL_LDLIBS := -llog)

[andjoy]

Dear Havlenapetr, i build this project in the same environment as seasky's, cygwin v2.721 + NDKr4b + Android SDK2.2, but i met some errors as following:
1,/cygdrive/e/cygwin/android-ndk-r4b/samples/havlenapetr-FFMpeg-ndk/jni/jni/../include/drivers_map.h:32: error: invalid conversion from 'int ()()' to 'int ()(JN
IEnv_, jobject)'
fixed as:typedef int (*audioDriver_register_t) ();
2,__android_log_print(ANDROID_LOG_INFO, TAG, "releasing FFMpegAVFormatContext"),
3,MediaPlayerControl mMediaPlayerControl = new MediaPlayerControl()
Multiple markers at this line
- The type new MediaController.MediaPlayerControl(){} must implement the inherited abstract method
MediaController.MediaPlayerControl.canSeekForward()
- The type new MediaController.MediaPlayerControl(){} must implement the inherited abstract method
MediaController.MediaPlayerControl.canSeekBackward()
- The type new MediaController.MediaPlayerControl(){} must implement the inherited abstract method MediaController.MediaPlayerControl.canPause()
fixed as: add unimplemented methods
4,\jni\jni\Android.mk
ifeq ($(IN_NDK),true)
LOCAL_LDLIBS := -llog
else
LOCAL_PRELINK_MODULE := false
LOCAL_SHARED_LIBRARIES := liblog
endif
fixed as:
ifeq ($(IN_NDK),true)
LOCAL_LDLIBS := -llog
else
LOCAL_PRELINK_MODULE := false
LOCAL_SHARED_LIBRARIES := liblog
LOCAL_LDLIBS := -L$(SYSROOT)/usr/lib -llog
endif

I tried to fix these issues, but the final apk doesn't work well. the app can only play some special mp4 files, and the size of libffmpeg_jni.so is only 3,329K Bytes. would you please tell me the right procedure to build this project?

[ashcairo]

Hi, I've currently gotten as far as the

SharedLibrary : libffmpeg_jni.so
/cygdrive/c/android-ndk-r4b/samples/ffmpeg/obj/local/armeabi/objs/ffmpeg_jni/com_media_ffmpeg_FFMpegAVFormatContext.o: In function AVFormatContext_re
lease':
/cygdrive/c/android-ndk-r4b/samples/ffmpeg/jni/jni/com_media_ffmpeg_FFMpegAVFormatContext.c:85: undefined reference to__android_log_print'

error.

Have you had any luck in finding a solution with getting the project to run?

[Seasky]

You can try put the liblog.so into the obj directory. Good Luck!

Date: Tue, 17 May 2011 07:41:37 -0700
From: [email protected]
To: [email protected]
Subject: Re: [FFMpeg] Build error with cygwin+NDKr4b (#1)

Hi, I've currently gotten as far as the

SharedLibrary : libffmpeg_jni.so
/cygdrive/c/android-ndk-r4b/samples/ffmpeg/obj/local/armeabi/objs/ffmpeg_jni/com_media_ffmpeg_FFMpegAVFormatContext.o: In function AVFormatContext_re
lease':
/cygdrive/c/android-ndk-r4b/samples/ffmpeg/jni/jni/com_media_ffmpeg_FFMpegAVFormatContext.c:85: undefined reference to__android_log_print'

error.

Have you had any luck in finding a solution with getting the project to run?

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