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• Revision c36f78b054 : Use frame index directly in get_chessboard_index The get_chessboard_index() use

  26 juillet 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_encoder.h

  
   Modify /vp9/encoder/vp9_pickmode.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
  
  Use frame index directly in get_chessboard_index

  The get_chessboard_index() used to call the entire VP9_COMMON
  struct pointer to retrieve the chessboard pattern index. This cl
  makes it call the frame index directly.

  Change-Id : I3cad9d209ea2e77a358085a04fe1ff0ddec5ba03

• Undefined references while using ffmpeg 2.1.1 for Android

  2 décembre 2013, par Kernald

  I'm building ffmpeg following the same pattern as halfninja's build : make the ffmpeg's main available from Java through JNI. I built ffmpeg with the following options :

  ./configure \
  
      --prefix=$PREFIX \
  
      --disable-shared \
  
      --enable-static \
  
      --disable-doc \
  
      --disable-ffmpeg \
  
      --disable-ffplay \
  
      --disable-ffprobe \
  
      --disable-ffserver \
  
      --disable-doc \
  
      --disable-symver \
  
      --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
      --target-os=linux \
  
      --arch=arm \
  
      --enable-cross-compile \
  
      --sysroot=$SYSROOT \
  
      --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  
      --extra-ldflags="$ADDI_LDFLAGS"

  $PREFIX, TOOLCHAIN, … being set to corresponding folders from my NDK. $ADDI_CFLAGS is set to -marm and $ADDI_LDFLAGS and $ADDITIONAL_CONFIGURE_FLAGS are both unset. The resulting static libraries are created :

  $ ls -1 android/arm/lib/
  libavcodec.a
  libavdevice.a
  libavfilter.a
  libavformat.a
  libavutil.a
  libswresample.a
  libswscale.a
  pkgconfig

  I expose them with an Android.mk file, ffmpeg being built in $NDK/sources/ffmpeg-2.1.1 :

  LOCAL_PATH:= $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavdevice
  
  LOCAL_SRC_FILES:= lib/libavdevice.a
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavcodec
  
  LOCAL_SRC_FILES:= lib/libavcodec.a
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavformat
  
  LOCAL_SRC_FILES:= lib/libavformat.a
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libswscale
  
  LOCAL_SRC_FILES:= lib/libswscale.a
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavutil
  
  LOCAL_SRC_FILES:= lib/libavutil.a
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libavfilter
  
  LOCAL_SRC_FILES:= lib/libavfilter.a
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_STATIC_LIBRARY)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_MODULE:= libwsresample
  
  LOCAL_SRC_FILES:= lib/libswresample.a
  
  LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/include
  
  include $(PREBUILT_STATIC_LIBRARY)

  So, up to there, everything looks good. Now, I try to build the ffmpeg binary equivalent as a static library. I copied (and didn't change a single character for now) ffmpeg.c, ffmpeg.h, cmdutils.c, cmdutils.h, ffmpeg_opt.cand ffmpeg_filter.c in my jni folder. I also have two directly JNI-related files in this folder (copied from halfninja's build, I just changed the package name). Here's the relevant Android.mk :

  LOCAL_PATH := $(call my-dir)
  
  
  
  include $(CLEAR_VARS)
  
  LOCAL_C_INCLUDES := /Applications/android-ndk-r9b/sources/ffmpeg-2.1.1
  
  LOCAL_CFLAGS := -Wdeprecated-declarations
  
  LOCAL_MODULE := videokit
  
  ANDROID_LIB := -landroid
  
  LOCAL_LDLIBS += -llog -ljnigraphics -lz 
  
  LOCAL_SRC_FILES := videokit/com_rfc_video_ffmpeg_Videokit.c videokit/ffmpeg.c videokit/cmdutils.c videokit/ffmpeg_opt.c videokit/ffmpeg_filter.c
  
  LOCAL_SHARED_LIBRARIES := libavdevice libavformat libavfilter libavcodec libwscale libavutil libswresample libswscale libpostproc
  
  include $(BUILD_SHARED_LIBRARY)
  
  $(call import-module,ffmpeg-2.1.1/android/arm)

  Everything compiles fine, but doesn't link. Here are the first errors :

  [armeabi] SharedLibrary : libvideokit.so
  /Applications/android-ndk-r9b/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld : ./obj/local/armeabi/objs/videokit/videokit/cmdutils.o : in function print_all_libs_info.constprop.5:jni/videokit/cmdutils.c:1063 : error : undefined reference to 'swresample_version'
  /Applications/android-ndk-r9b/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld : ./obj/local/armeabi/objs/videokit/videokit/cmdutils.o : in function print_all_libs_info.constprop.5:jni/videokit/cmdutils.c:1063 : error : undefined reference to 'swresample_configuration'
  /Applications/android-ndk-r9b/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld : ./obj/local/armeabi/objs/videokit/videokit/cmdutils.o : in function opt_default:jni/videokit/cmdutils.c:558 : error : undefined reference to 'swr_get_class'
  /Applications/android-ndk-r9b/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld : ./obj/local/armeabi/objs/videokit/videokit/cmdutils.o : in function opt_default:jni/videokit/cmdutils.c:561 : error : undefined reference to 'swr_alloc'
  /Applications/android-ndk-r9b/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld : ./obj/local/armeabi/objs/videokit/videokit/cmdutils.o : in function opt_default:jni/videokit/cmdutils.c:563 : error : undefined reference to 'swr_free'
  /Applications/android-ndk-r9b/toolchains/arm-linux-androideabi-4.6/prebuilt/darwin-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld : ./obj/local/armeabi/objs/videokit/videokit/ffmpeg_opt.o : in function show_help_default:jni/videokit/ffmpeg_opt.c:2464 : error : undefined reference to 'swr_get_class'

  What I don't understand is that these functions are defined and available in libswresample.a, which I'm linking to :

  arm-linux-androideabi-nm /Applications/android-ndk-r9b/sources/ffmpeg-2.1.1/android/arm/lib/libswresample.a  | grep -i -e swr_get_class -e swresample_version
  000001d4 T swr_get_class
  00000178 T swresample_version

  What am I doing wrong ? Is there another, maybe simpler way to expose ffmpeg as a static library available via JNI ? (I don't use halfninja's because I need at least ffmpeg 1.1, while his is in 0.9).

• ARM inline asm secrets

  6 juillet 2010, par Mans — ARM, Compilers

  Although I generally recommend against using GCC inline assembly, preferring instead pure assembly code in separate files, there are occasions where inline is the appropriate solution. Should one, at a time like this, turn to the GCC documentation for guidance, one must be prepared for a degree of disappointment. As … Continue reading →