Using libmp3lame in Android

Hi,
I have no idea whether this is the right place to ask a development question regarding the use of libmp3lame on Android. I'm having some trouble decoding mp3 using the hip_decode() function and could use a little bit of help. If this is not the right place to ask such a question, don't read the following email :). 
I'm trying to code an Android Application which receives mp3 audio chunks through a WebSocket (audio is a live-stream voice encoded with libmp3lame).The Android app is supposed to play each small audio chunks received, thus making the app able to "listen" to the broadcaster in real-time. 
I'm using AudioTrack in Android, which allows me to "write" into the track a byte array every time I receive one, and play it instantly. The only problem is that Audio Track does not accept MP3. So I need to decode each little audio chunk from MP3 to PCM. I first used JLayer, which worked, but had some "robotic effect" while trying to listen to the live stream. I figured it was a decoding problem. Since the MP3 is firstly encoded using libmp3lame, I figured using the same library to decode the signal might be smarter. 
I finally implemented the libmp3lame in my Android NDK and I'm currently trying to decode each small audio chunks into PCM using the hip_decode function. I'm currently doing this : 
JNIEXPORT jshortArray JNICALL Java_com_example_jneb_myapplication_AudioTrackClass_decoderInit(JNIEnv *env, jobject jobj,
                                                                                     jbyteArray data, jint size) {
    jsize mp3Len =  (*env)->GetArrayLength(env, data);
    // Print the data.length = 96
    LOGI("JNI integer: %d", mp3Len);
    // mp3 contains all 96 values
    jbyte *mp3 = (*env)->GetByteArrayElements(env, data, 0);

    // Trying to decode mp3 into PCM
    int x = hip_decode(hip, (unsigned char*) mp3, (size_t) mp3Len, pcm_l, pcm_r);

    jshortArray pcmBuffer;
    pcmBuffer = (*env)->NewShortArray(env, mp3Len);
    (*env)->SetShortArrayRegion(env, pcmBuffer, 0, mp3Len, pcm_l);
    // Releasing byte array
    (*env)->ReleaseByteArrayElements(env, data, mp3, 0);

    // Returning
    return pcmBuffer;}I have a byte array in the input of the function, and I need the decoded PCM sample in the output. Right now when I read the pcmBuffer value in my Java-Side application, all data are "0". So here I'm stuck. I don't know what I'm doing wrong since my C skills are really really bad, and I couldn't find a lot of MP3 decoding example on the web.


I apologize in advance if it's not the right place to ask a question.
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