[android-developers] Undefined Reference - ffmpeg on android ndk

I´ve spent many hours trying to figure out why I still get "undefined
reference" when trying to link to ffmpeg. I´ve already read most of
not all posts and sites about the subject, so I think I´m missing
something little here and I hope you can help me.

What I have:

I´m using windows 7 + cygwin + crystax r4. I´ve compiled FFMPEG using
RockPlayer's ffmpeg source plus some modifications I did (only to
include / exclude demuxes, decoders, encoders, ...) After compiling, I
get:

a new folder named armv5te, which includes:
a folder named "include" with all folders for each libs' .h
a folder named "lib" which includes all libs' .a
a shared library named libffmpeg.so (checked soname and it is
libffmpeg)
The shared library isn´t also placed on project/lib/armeabi/
libffmpeg.so

After compiling I tried to compile my project and link it. While
my .cpp compiles ok, I get many undefined references.

Here is my android.mk:
--------------------------------------------------
LOCAL_PATH := $(call my-dir)
#declare the prebuilt library
include $(CLEAR_VARS)
LOCAL_MODULE := ffmpeg-prebuilt
LOCAL_SRC_FILES := $(LOCAL_PATH)/ffmpeg/android/armv5te/libffmpeg.so
LOCAL_EXPORT_C_INCLUDES := $(LOCAL_PATH)/ffmpeg/android/armv5te/
include
LOCAL_PRELINK_MODULE := true
include $(PREBUILT_SHARED_LIBRARY)

include $(CLEAR_VARS)
LOCAL_MODULE := audiocodec
LOCAL_SRC_FILES := ffmpeg_audio.cpp
LOCAL_SHARED_LIBRARY := libffmpeg
LOCAL_C_INCLUDES := $(LOCAL_PATH)/ffmpeg/android/armv5te/include
LOCAL_LDLIBS := -llog -ljnigraphics -lz -lm $(LOCAL_PATH)/ffmpeg/
android/armv5te/libffmpeg.so
include $(BUILD_SHARED_LIBRARY)
--------------------------------------------------

The result:
--------------------------------------------------
Compile++ thumb: audiocodec <= /cygdrive/c/Gabriel/Desenvolvimento/
Workspace/FFM
PEG/jni/ffmpeg_audio.cpp
SharedLibrary : libaudiocodec.so
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/obj/local/armeabi/
objs/audi
ocodec/ffmpeg_audio.o: In function
`Java_gabriel_audioslower_pro_ffmpegDecoder_r
eadSamples':
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:172: u
ndefined reference to `avcodec_decode_audio3(AVCodecContext*, short*,
int*, AVPa
cket*)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:178: u
ndefined reference to `av_read_frame(AVFormatContext*, AVPacket*)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/obj/local/armeabi/
objs/audi
ocodec/ffmpeg_audio.o: In function
`Java_gabriel_audioslower_pro_ffmpegDecoder_s
eekToPosMS':
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:147: u
ndefined reference to `av_rescale_q(long long, AVRational,
AVRational)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:150: u
ndefined reference to `av_seek_frame(AVFormatContext*, int, long long,
int)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:151: u
ndefined reference to `avcodec_flush_buffers(AVCodecContext*)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:152: u
ndefined reference to `av_read_frame(AVFormatContext*, AVPacket*)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/obj/local/armeabi/
objs/audi
ocodec/ffmpeg_audio.o: In function
`Java_gabriel_audioslower_pro_ffmpegDecoder_c
loseFile':
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:82: un
defined reference to `avcodec_close(AVCodecContext*)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:83: un
defined reference to `av_free(void*)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:84: un
defined reference to `av_close_input_file(AVFormatContext*)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/obj/local/armeabi/
objs/audi
ocodec/ffmpeg_audio.o: In function
`Java_gabriel_audioslower_pro_ffmpegDecoder_o
penAudioFile':
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:37: un
defined reference to `av_open_input_file(AVFormatContext**, char
const*, AVInput
Format*, int, AVFormatParameters*)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:44: un
defined reference to `av_find_stream_info(AVFormatContext*)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:52: un
defined reference to `avcodec_find_decoder(CodecID)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:60: un
defined reference to `avcodec_open(AVCodecContext*, AVCodec*)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:67: un
defined reference to `av_malloc(unsigned int)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:70: un
defined reference to `av_read_frame(AVFormatContext*, AVPacket*)'
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/obj/local/armeabi/
objs/audi
ocodec/ffmpeg_audio.o: In function `JNI_OnLoad':
/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/jni/
ffmpeg_audio.cpp:25: un
defined reference to `av_register_all()'
collect2: ld returned 1 exit status
make: *** [/cygdrive/c/Gabriel/Desenvolvimento/Workspace/FFMPEG/obj/
local/armeab
i/libaudiocodec.so] Error 1
--------------------------------------------------

Something interesting is that some functions from ffmpeg, as
av_register_all(), do now show up on the list of undefined references.

Any ideas on what I can do to fix it? I´ve spent 3 days trying to make
things work .. Thanks!

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