Question

我使用bambuser的文件编译了FFMPEG for android。编译运行正常。没有错误。我还确保在build.sh中更改包名称。但是，一旦我尝试链接到文件，手机就会抛出UnsatisfiedLinkError。这是Androkd.mk文件：

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)
MY_LIB_PATH := ffmpeg-android/build/ffmpeg/armeabi/lib
LOCAL_MODULE := bambuser-libavcore
LOCAL_SRC_FILES := $(MY_LIB_PATH)/libavcore.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := bambuser-libavformat
LOCAL_SRC_FILES := $(MY_LIB_PATH)/libavformat.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := bambuser-libavcodec
LOCAL_SRC_FILES := $(MY_LIB_PATH)/libavcodec.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := bambuser-libavdevice
LOCAL_SRC_FILES := $(MY_LIB_PATH)/libavdevice.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := bambuser-libavfilter
LOCAL_SRC_FILES := $(MY_LIB_PATH)/libavfilter.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := bambuser-libavutil
LOCAL_SRC_FILES := $(MY_LIB_PATH)/libavutil.so
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := bambuser-libswscale
LOCAL_SRC_FILES := $(MY_LIB_PATH)/libswscale.so
include $(PREBUILT_SHARED_LIBRARY)


#local_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := libtest_jni
LOCAL_SRC_FILES := libtest/video.c

LOCAL_C_INCLUDES := \
    $(LOCAL_PATH)/include \
        $(LOCAL_PATH)/ffmpeg-android/ffmpeg 
        LOCAL_LDLIBS := -L$(NDK_PLATFORMS_ROOT)/$(TARGET_PLATFORM)/arch-arm/usr/lib -L$(LOCAL_PATH) -L$(LOCAL_PATH)/ffmpeg-android/build/ffmpeg/armeabi/lib/ -lavformat -lavcodec -lavdevice -lavfilter -lavutil -lswscale -llog -lz -lm
        #dl -lgcc

        include $(BUILD_SHARED_LIBRARY)

Video.c很简单：

#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>

#include <jni.h>  
#include <string.h>  
#include <stdio.h>
#include <android/log.h>  

void Java_com_bukabros_videolivewallpaper_Opengl2Renderer_loadNthFrame3
       (JNIEnv * env, jobject this, jstring fileName)  {

       jboolean isCopy;  
         const char * szLogThis = (*env)->GetStringUTFChars(env, fileName, &isCopy);  

          __android_log_print(ANDROID_LOG_DEBUG, "NDK: ", "NDK:LC: [%s]", szLogThis); 
          }

相应的Java代码也很简单：

 private native void loadNthFrame3(String fileName);

 static {  
System.loadLibrary("libtest_jni");  
 }

但是我收到了这个错误：

E/AndroidRuntime(11489): FATAL EXCEPTION: main

E/AndroidRuntime(11489): java.lang.ExceptionInInitializerError

E/AndroidRuntime(11489):    at com.bukabros.videolivewallpaper.VideoLiveWallpaper$CubeEngine.<init>(VideoLiveWallpaper.java:147)

E/AndroidRuntime(11489):    at com.bukabros.videolivewallpaper.VideoLiveWallpaper.onCreateEngine(VideoLiveWallpaper.java:120)

E/AndroidRuntime(11489):    at android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessage(WallpaperService.java:814)

E/AndroidRuntime(11489):    at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61)

E/AndroidRuntime(11489):    at android.os.Handler.dispatchMessage(Handler.java:99)

E/AndroidRuntime(11489):    at android.os.Looper.loop(Looper.java:123)

E/AndroidRuntime(11489):    at android.app.ActivityThread.main(ActivityThread.java:4627)

E/AndroidRuntime(11489):    at java.lang.reflect.Method.invokeNative(Native Method)

E/AndroidRuntime(11489):    at java.lang.reflect.Method.invoke(Method.java:521)

E/AndroidRuntime(11489):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)

E/AndroidRuntime(11489):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)

E/AndroidRuntime(11489):    at dalvik.system.NativeStart.main(Native Method)

E/AndroidRuntime(11489): Caused by: java.lang.UnsatisfiedLinkError: Library libtest_jni not found

E/AndroidRuntime(11489):    at java.lang.Runtime.loadLibrary(Runtime.java:461)

E/AndroidRuntime(11489):    at java.lang.System.loadLibrary(System.java:557)

E/AndroidRuntime(11489):    at com.bukabros.videolivewallpaper.Opengl2Renderer.<clinit>(Opengl2Renderer.java:389)

E/AndroidRuntime(11489):    ... 12 more

我尝试用Java手动加载预建的共享库（bambuser文件）（使用System.loadLibrary），但后来它告诉我找不到文件。

如果有帮助，这里是readelf的输出：

 0x00000001 (NEEDED)                     Shared library: [libc.so]
  0x00000001 (NEEDED)                     Shared library: [libstdc++.so]
   0x00000001 (NEEDED)                     Shared library: [libm.so]
    0x00000001 (NEEDED)                     Shared library: [/data/data/com.bukabros.videolivewallpaper/lib/libavformat.so]
     0x00000001 (NEEDED)                     Shared library: [/data/data/com.bukabros.videolivewallpaper/lib/libavcodec.so]
      0x00000001 (NEEDED)                     Shared library: [/data/data/com.bukabros.videolivewallpaper/lib/libavdevice.so]
       0x00000001 (NEEDED)                     Shared library: [/data/data/com.bukabros.videolivewallpaper/lib/libavfilter.so]
        0x00000001 (NEEDED)                     Shared library: [/data/data/com.bukabros.videolivewallpaper/lib/libavutil.so]
     0x00000001 (NEEDED)                     Shared library: [/data/data/com.bukabros.videolivewallpaper/lib/libswscale.so]
      0x00000001 (NEEDED)                     Shared library: [liblog.so]
       0x00000001 (NEEDED)                     Shared library: [libz.so]
        0x00000001 (NEEDED)                     Shared library: [libdl.so]
         0x0000000e (SONAME)                     Library soname: [libtest_jni.so]
          0x00000010 (SYMBOLIC)                   0x0
           0x00000004 (HASH)                       0xd4
            0x00000005 (STRTAB)                     0x250
         0x00000006 (SYMTAB)                     0x130
          0x0000000a (STRSZ)                      712 (bytes)
           0x0000000b (SYMENT)                     16 (bytes)
            0x00000003 (PLTGOT)                     0x174c
             0x00000002 (PLTRELSZ)                   32 (bytes)
              0x00000014 (PLTREL)                     REL
               0x00000017 (JMPREL)                     0x55c
                0x6ffffffe (VERNEED)                    0x53c
             0x6fffffff (VERNEEDNUM)                 1
              0x6ffffff0 (VERSYM)                     0x518
               0x00000000 (NULL)                       0x0

噢，是的。我正在使用ndk r5。

Answer 1

看起来我找到了答案。问题是当您使用Java（System.loadLibrary）加载库时，不能使用“lib”前缀。我还必须在Java中手动加载ffmpeg库。故事的寓意是你应该总是阅读文档而不要放弃:-)这是正确的代码：

 static {  
System.loadLibrary("avcore");
System.loadLibrary("avformat");
System.loadLibrary("avcodec");
System.loadLibrary("avdevice");
System.loadLibrary("avfilter");
System.loadLibrary("avutil");
System.loadLibrary("swscale");
System.loadLibrary("test_jni");  
 }

不满意的LIKError使用NDK链接到FFMPEG

1 个答案: