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• undefined reference to 'main' in Android.mk file with NDK

  25 juillet 2015, par Laurent Gorse

  I’m trying to recompile a native ffmpeg (with rtmp) library with PIE for Android 5.0 compatibility.

  The library works fine without -pie, but when I try to recompile it with the following flags :

  LOCAL_CFLAGS += -fPIE
  
  LOCAL_LDFLAGS += -fPIE -pie

  the following error gets thrown :

  /Users/lgorse/Android_Libraries/android-ndk-r10e/platforms/android-21/arch-arm/usr/lib/crtbegin_dynamic.o:crtbrand.c:function _start: error: undefined reference to 'main'
  
  Error:error: ld returned 1 exit status
  
  make: *** [obj/local/armeabi/libffmpegbridge.so] Error 1
  
  make: Leaving directory `/Users/lgorse/Android_Libraries/ffmpegbridge/app/src/main'
  
  :app:ndkBuild FAILED
  
  Error:Execution failed for task ':app:ndkBuild'.
  
  > Process 'command '/Users/lgorse/Android_Libraries/android-ndk-r10e/ndk-build'' finished with non-zero exit value 2

  It seems that the ndk-build is trying to access a .main method from within crtbegin_dynamic. Those files are built-in with the NDK so I assume there’s nothing fundamentally wrong with them, and I’m attempting to run my configuration in the wrong way.

  Here is the Android.mk file :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  
  
  LOCAL_MODULE := ffmpegbridge
  
  LOCAL_SRC_FILES := ffmpegbridge.c ffmpegbridge_context.c logdump.c
  
  LOCAL_CFLAGS := -I$(LOCAL_PATH)/include -I$(LOCAL_PATH)/../prebuilt/include
  
  LOCAL_CFLAGS += -fPIE
  
  LOCAL_LDFLAGS += -fPIE -pie
  
  LOCAL_LDLIBS += -llog
  
  LOCAL_LDLIBS += -L$(LOCAL_PATH)/../prebuilt/lib
  
  LOCAL_LDLIBS += -lcrypto -lssl -lrtmp-1 -lavcodec-56 -lavdevice-56 -lavfilter-5 -lavformat-56 -lavutil-54 -lswresample-1 -lswscale-3
  
  
  
  include $(BUILD_SHARED_LIBRARY)

  Here is my Gradle file (it contains the build instructions for ndkBuild) :

  apply plugin: 'android'
  
  
  
  android {
  
      compileSdkVersion 19
  
      buildToolsVersion "19.1.0"
  
  
  
      defaultConfig {
  
          applicationId "io.cine.ffmpegbridge"
  
          minSdkVersion 18
  
          targetSdkVersion 19
  
          versionCode 1
  
          versionName "1.0"
  
      }
  
  
  
      buildTypes {
  
          release {
  
              minifyEnabled false
  
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
  
          }
  
      }
  
      sourceSets.main {
  
          jniLibs.srcDir 'src/main/libs'
  
          jni.srcDirs = [] // disable NDK-auto-build
  
      }
  
  
  
      Properties properties = new Properties()
  
      properties.load(project.rootProject.file('local.properties').newDataInputStream())
  
  
  
      task ndkBuild(type: Exec) {
  
          def ndkDir = properties.getProperty('ndk.dir')
  
          commandLine "$ndkDir/ndk-build", '-C', file('src/main').absolutePath
  
      }
  
  
  
      task cleanNdkBuild(type: Exec) {
  
          def ndkDir = properties.getProperty('ndk.dir')
  
          commandLine "$ndkDir/ndk-build", '-C', file('src/main').absolutePath, "clean"
  
      }
  
  
  
      tasks.withType(JavaCompile) { compileTask -> compileTask.dependsOn ndkBuild }
  
      clean.dependsOn cleanNdkBuild
  
  }
  
  
  
  dependencies {
  
      compile fileTree(dir: 'libs', include: ['*.jar'])
  
  }

  I’ll be watching this question closely so feel free to ask for follow-ups. I’m definitely around !

• aacenc : do not reject AAC-Main profile

  21 août 2015, par Rostislav Pehlivanov

  aacenc : do not reject AAC-Main profile
  This commit permits for the use of the Main profile
  
  in encoding. The functionality of that profile will
  
  be added in the commits following. By itself, this
  
  commit does not alter anything.
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/aacenc.c
  • [DH] libavcodec/aacenc.h

• aacenc : reset special bands in the main frame encoding function

  21 août 2015, par Rostislav Pehlivanov

  aacenc : reset special bands in the main frame encoding function
  This commit moves the resetting of special bands (above RESERVED_BT)
  
  to the main frame encoding function rather than the way it was done
  
  previously in their corresponding search_for_... functions.
  The reason why special bands need to be reset is that while normal
  
  bands get chosen for every frame by the coder (twoloop by default)
  
  the coders do not touch any special sfbs and will therefore
  
  make them persist throughout the file.
  If we zero them out any bands left unmarked will be chosen by
  
  the second part of the coder (the trellis function in aaccoder.c).
  Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
  

  • [DH] libavcodec/aaccoder.c
  • [DH] libavcodec/aacenc.c