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• UnsatisfiedLInkError Linking to FFMPEG with NDK

  28 novembre 2011, par U Avalos

  I compiled FFMPEG for android using bambuser's files. The compile runs fine. No errors.
  I also made sure to change the package name in build.sh. However, once I try to link to the files, the phone throws an UnsatisfiedLinkError. This is the Androkd.mk file :

  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 is dead simple :

  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  
  
  #include   
  
  #include   
  
  #include 
  
  #include <android></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, &amp;isCopy);  
  
  
  
            __android_log_print(ANDROID_LOG_DEBUG, "NDK: ", "NDK:LC: [%s]", szLogThis); 
  
            }   

  Tne corresponding Java code is also simple :

   private native void loadNthFrame3(String fileName);
  
  
  
   static {  
  
  System.loadLibrary("libtest_jni");  
  
   }  

  But I get this error :

  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
  
  </clinit></init>

  I tried manually loading the prebuilt shared libraries (the bambuser files) in Java (using System.loadLibrary) but then it tells me that the files are not found.

  If it helps, here's the output of readelf :

   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

  Oh yeah. I'm using ndk r5.

• Revision 5e3439bbf7 : sad_test : fix msvc compile Fixes : error C2121 : '#' : invalid character : possib

  30 mai 2013, par James Zern

  Changed Paths :
   Modify /test/sad_test.cc

  
  
  sad_test : fix msvc compile

  Fixes :
  error C2121 : '#' : invalid character : possibly the result of a macro expansion

  Change-Id : I63d7ebba29f3a3cbb546406be39270290e9dc47d
  (cherry picked from commit a91e5b4fdc4e81352fa3a65c7fc795527eee6b07)

• Webcam stream with FFMpeg on iPhone

  6 décembre 2011, par Saphrosit

  I'm trying to send and show a webcam stream from a linux server to an iPhone app. I don't know if it's the best solution, but I downloaded and installed FFMpeg on the linux server (following, for those who want to know, this tutorial).
  FFMpeg is working fine. After a lots of wandering, I managed to send a stream to the client launching

  ffmpeg  -s 320x240 -f video4linux2 -i /dev/video0 -f mpegts -vcodec libx264 udp://192.168.1.34:1234

  where 192.168.1.34 is the address of the client. Actually the client is a Mac, but it is supposed to be an iPhone. I know the stream is sent and received correctly (tested in different ways).
  However I didn't managed to watch the stream directly on the iPhone.
  I thought of different (possible) solutions :

  • first solution : store incoming data in a NSMutableData object. Then, when the stream ends, store it and then play it using a MPMoviePlayerController. Here's the code :

    [video writeToFile:@"videoStream.m4v" atomically:YES];
    
    NSURL *url = [NSURL fileURLWithPath:@"videoStream.m4v"];
    
    
    
    MPMoviePlayerController *videoController = [[MPMoviePlayerController alloc] initWithContentURL:url];
    
    
    
    [videoController.view setFrame:CGRectMake(100, 100, 150, 150)];
    
    
    
    [self.view addSubview:videoController.view];
    
    
    
    [videoController play];

    the problem of this solution is that nothing is played (I only see a black square), even if the video is saved correctly (I can play it directly from my disk using VLC). Besides, it's not such a great idea. It's just to make things work.

  • Second solution : use CMSampleBufferRef to store the incoming video. Much more problems comes with this solution : first of all, there's no CoreMedia.framework in my system. Besides I do not get well what does this class represents and what should I do to make it works : I mean if I start (somehow) filling this "SampleBuffer" with bytes I receive from UDP connection, then it will automatically call the CMSampleBufferMakeDataReadyCallback function I set during creation ? If yes, when ? When the single frame is completed or when the whole stream is received ?

  • Third solution : use AVFoundation framework (neither this is actually available on my Mac). I did not understand if it's actually possible to start recording from a remote source or even from a NSMutableData, a char* or something like that. On AVFoundation Programming Guide I didn't find any reference that say if it's possible or not.

  I don't know which one of this solution is the best for my purpose. ANY suggestion would be appreciate.

  Besides, there's also another problem : I didn't use any segmenter program to send the video. Now, if I'm not getting wrong, segmenter needs to split the source video in smaller/shorter video easier to send. If it is right, then maybe it's not strictly necessary to make things work (may be added later). However, since the server is running under linux, I cannot use Apple's mediastreamsegmeter. May someone suggest an opensource segmenter to use in association with FFMpeg ?

  ---

  UPDATE : I edited my question adding more informations on what I did since now and what my doubts are.