Android NDK:获取 java.lang.UnsatisfiedLinkError:dlopen 失败:无法定位符号“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)

包含 $(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)

和Application.mk文件代码是:

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 之前是一个内联函数，现在它不再内联了.

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 版本的设备并不完全兼容.就您而言，在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).

使用NDK时，您应该使用与您的android:minSdkVersion相对应的平台(APP_PLATFORM:=android-XX).

When using the NDK, you should use the platform (APP_PLATFORM:=android-XX) that corresponds to your android:minSdkVersion.

所以在这里你可以在Application.mk Makefile中设置APP_PLATFORM:=android-15，你的lib将使用信号的内联版本，所以它不会看起来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.

这篇关于Android NDK:获取 java.lang.UnsatisfiedLinkError:dlopen 失败:无法定位符号“信号"；由“libffmpeg.so"引用；的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！