My problem is how to cancel echo using jni in android between two devices. I tried to use the code in this link Speex echo cancellation configuration but it didn't work to me! in this code
#include <jni.h>
#include "speex/speex_echo.h"
#include "speex/speex_preprocess.h"
SpeexEchoState *st;
SpeexPreprocessState *den;
JNIEXPORT void JNICALL Java_speex_EchoCanceller_open
(JNIEnv *env, jobject jObj, jint jSampleRate, jint jBufSize, jint jTotalSize)
{
//init
int sampleRate=jSampleRate;
st = speex_echo_state_init(jBufSize, jTotalSize);
den = speex_preprocess_state_init(jBufSize, sampleRate);
speex_echo_ctl(st, SPEEX_ECHO_SET_SAMPLING_RATE, &sampleRate);
speex_preprocess_ctl(den, SPEEX_PREPROCESS_SET_ECHO_STATE, st);
}
JNIEXPORT jshortArray JNICALL Java_speex_EchoCanceller_process
(JNIEnv * env, jobject jObj, jshortArray input_frame, jshortArray echo_frame)
{
//create native shorts from java shorts
jshort *native_input_frame = (*env)->GetShortArrayElements(env, input_frame, NULL);
jshort *native_echo_frame = (*env)->GetShortArrayElements(env, echo_frame, NULL);
//allocate memory for output data
jint length = (*env)->GetArrayLength(env, input_frame);
jshortArray temp = (*env)->NewShortArray(env, length);
jshort *native_output_frame = (*env)->GetShortArrayElements(env, temp, 0);
//call echo cancellation
speex_echo_cancellation(st, native_input_frame, native_echo_frame, native_output_frame);
//preprocess output frame
speex_preprocess_run(den, native_output_frame);
//convert native output to java layer output
jshortArray output_shorts = (*env)->NewShortArray(env, length);
(*env)->SetShortArrayRegion(env, output_shorts, 0, length, native_output_frame);
//cleanup and return
(*env)->ReleaseShortArrayElements(env, input_frame, native_input_frame, 0);
(*env)->ReleaseShortArrayElements(env, echo_frame, native_echo_frame, 0);
(*env)->ReleaseShortArrayElements(env, temp, native_output_frame, 0);
return output_shorts;
}
JNIEXPORT void JNICALL Java_speex_EchoCanceller_close
(JNIEnv *env, jobject jObj)
{
//close
speex_echo_state_destroy(st);
speex_preprocess_state_destroy(den);
}
And the Android.mk is
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := SendAudio2
LOCAL_SRC_FILES := speex.c
include $(BUILD_SHARED_LIBRARY)
When I build my project i get error
/home/Develop/AndroidNDK/android-ndk-r9d/ndk-build all
Android NDK: WARNING: APP_PLATFORM android-19 is larger than android:minSdkVersion 8 in ./AndroidManifest.xml
[armeabi] Compile thumb : SendAudio2 <= speex.c
[armeabi] SharedLibrary : libSendAudio2.so
/home/Develop/AndroidNDK/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/SendAudio2/speex.o: in function Java_speex_EchoCanceller_open:jni/speex.c:15: error: undefined reference to 'speex_echo_state_init'
/home/Develop/AndroidNDK/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/SendAudio2/speex.o: in function Java_speex_EchoCanceller_open:jni/speex.c:16: error: undefined reference to 'speex_preprocess_state_init'
/home/Develop/AndroidNDK/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/SendAudio2/speex.o: in function Java_speex_EchoCanceller_open:jni/speex.c:17: error: undefined reference to 'speex_echo_ctl'
/home/Develop/AndroidNDK/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/SendAudio2/speex.o: in function Java_speex_EchoCanceller_open:jni/speex.c:18: error: undefined reference to 'speex_preprocess_ctl'
/home/Develop/AndroidNDK/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/SendAudio2/speex.o: in function Java_speex_EchoCanceller_process:jni/speex.c:34: error: undefined reference to 'speex_echo_cancellation'
/home/Develop/AndroidNDK/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/SendAudio2/speex.o: in function Java_speex_EchoCanceller_process:jni/speex.c:36: error: undefined reference to 'speex_preprocess_run'
/home/Develop/AndroidNDK/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/SendAudio2/speex.o: in function Java_speex_EchoCanceller_close:jni/speex.c:54: error: undefined reference to 'speex_echo_state_destroy'
/home/Develop/AndroidNDK/android-ndk-r9d/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: ./obj/local/armeabi/objs/SendAudio2/speex.o: in function Java_speex_EchoCanceller_close:jni/speex.c:55: error: undefined reference to 'speex_preprocess_state_destroy'
collect2: ld returned 1 exit status
make: *** [obj/local/armeabi/libSendAudio2.so] Error 1
How can i resolve this? thanks!!
