Android NDK:获取 java.lang.UnsatisfiedLinkError:dlopen 失败:找不到符号“信号"由“libffmpeg.so"引用; [英] Android NDK : Getting java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "signal" referenced by "libffmpeg.so"
问题描述
我有一个视频修剪器应用程序代码.
I have a video trimmer application code .
其Android.mk文件代码如下:
Its Android.mk file code is mentioned below:
MY_LOCAL_PATH := $(call my-dir)
包括 $(all-subdir-makefiles)
include $(all-subdir-makefiles)
LOCAL_PATH :=$(MY_LOCAL_PATH)
include $(CLEAR_VARS)
LOCAL_MODULE := video-trimmer
LOCAL_SRC_FILES := video-trimmer.c
LOCAL_C_INCLUDES := $(MY_LOCAL_PATH) $(MY_LOCAL_PATH)/ffmpeg
LOCAL_SHARED_LIBRARIES := ffmpeg
LOCAL_LDLIBS += -lz -llog
include $(BUILD_SHARED_LIBRARY)
Application.mk 文件代码为:
and Application.mk file code is :
APP_MODULES := ffmpeg video-trimmer
APP_OPTIM := debug
当我尝试运行此应用程序时,出现以下错误:
When I try to run this application, I get following error :
02-26 16:06:05.779: E/AndroidRuntime(4092): FATAL EXCEPTION: main
02-26 16:06:05.779: E/AndroidRuntime(4092): Process: net.video.trimmer, PID: 4092
02-26 16:06:05.779: E/AndroidRuntime(4092): java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "signal" referenced by "libffmpeg.so"...
02-26 16:06:05.779: E/AndroidRuntime(4092): at java.lang.Runtime.loadLibrary(Runtime.java:364)
02-26 16:06:05.779: E/AndroidRuntime(4092): at java.lang.System.loadLibrary(System.java:526)
02-26 16:06:05.779: E/AndroidRuntime(4092): at net.video.trimmer.service.VideoTrimmingService.onCreate(VideoTrimmingService.java:29)
02-26 16:06:05.779: E/AndroidRuntime(4092): at android.app.ActivityThread.handleCreateService(ActivityThread.java:2585)
02-26 16:06:05.779: E/AndroidRuntime(4092): at android.app.ActivityThread.access$1800(ActivityThread.java:139)
02-26 16:06:05.779: E/AndroidRuntime(4092): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)
02-26 16:06:05.779: E/AndroidRuntime(4092): at android.os.Handler.dispatchMessage(Handler.java:102)
02-26 16:06:05.779: E/AndroidRuntime(4092): at android.os.Looper.loop(Looper.java:136)
02-26 16:06:05.779: E/AndroidRuntime(4092): at android.app.ActivityThread.main(ActivityThread.java:5086)
02-26 16:06:05.779: E/AndroidRuntime(4092): at java.lang.reflect.Method.invokeNative(Native Method)
02-26 16:06:05.779: E/AndroidRuntime(4092): at java.lang.reflect.Method.invoke(Method.java:515)
02-26 16:06:05.779: E/AndroidRuntime(4092): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
02-26 16:06:05.779: E/AndroidRuntime(4092): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
02-26 16:06:05.779: E/AndroidRuntime(4092): at dalvik.system.NativeStart.main(Native Method)
我的 video-trimmer.so 和 ffmpeg.so 是在 libsarmeabi
中生成的.
My video-trimmer.so and ffmpeg.so are generated in libsarmeabi
.
提前致谢.
推荐答案
signal
在平台 android-21 之前是内联函数,现在不再是内联函数了.
signal
was an inline function until platform android-21, now it's not inline anymore.
当您使用 ndk r10 时,默认使用 android-21,但它与运行旧 Android 版本的设备不完全兼容.在您的情况下,您的设备上找不到信号(但它可以在 Lollipop 上正常运行).
When you use the ndk r10, android-21 is used by default but it's not fully retro-compatible with devices running former Android versions. In your case, signal can't be found on your device (but it would run properly on Lollipop).
在使用 NDK 时,您应该使用与您的 android:minSdkVersion
对应的平台(APP_PLATFORM:=android-XX
).
When using the NDK, you should use the platform (APP_PLATFORM:=android-XX
) that corresponds to your android:minSdkVersion
.
所以这里你可以在Application.mk Makefile中设置APP_PLATFORM:=android-15
,你的lib会使用signal的内联版本,所以看起来不会为它在运行时的符号.
So here you can set APP_PLATFORM:=android-15
inside Application.mk Makefile, and your lib will use the inline version of signal, so it will not look for its symbol at runtime.
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