Problem with using ffmpeg on Android

I am using ffmpeg on Android for play audio. But it doesn't work well.

This is my Java code.

public class AudioPlayerActivity extends Activity 
{ 
private AudioTrack track; 
private FileOutputStream os; 
/** Called when the activity is first created. */ 
@Override 
public void onCreate(Bundle savedInstanceState) 
{ 
    super.onCreate(savedInstanceState);

    setContentView(R.layout.main); 

    createEngine(); 

    //MediaPlayer mp = new MediaPlayer(); 

    //mp.start(); 

    int bufSize = AudioTrack.getMinBufferSize(44100, 
                                              AudioFormat.CHANNEL_CONFIGURATION_STEREO,  
                                              AudioFormat.ENCODING_PCM_16BIT); 


    track = new AudioTrack(AudioManager.STREAM_MUSIC,  
                           44100,  
                           AudioFormat.CHANNEL_CONFIGURATION_STEREO,  
                           AudioFormat.ENCODING_PCM_16BIT,  
                           bufSize, 
                           AudioTrack.MODE_STREAM); 

    byte[] bytes = new byte[bufSize]; 

    try { 
        os = new FileOutputStream("/mnt/sdcard/test.out",false); 
    } catch (FileNotFoundException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
    } 

    //loadFile("/mnt/sdcard/test.mp3", bytes);
    String file = "/mnt/sdcard/Wildlife.WMV";
    //String file = "/mnt/sdcard/test.mp3";
    loadFile(file, bytes);

    try { 
        os.close(); 
    } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
    } 

} 

void playSound(byte[] buf, int size) {   
    //android.util.Log.v("ROHAUPT", "RAH Playing"); 
    if(track.getPlayState()!=AudioTrack.PLAYSTATE_PLAYING) {   
        Log.d("test", "aaaaaaaaaaaaaaaaaaaaa");
        track.play();
        Log.d("test", "aaaaaaaaaaaaaaaaaaaaa");
    }
    track.write(buf, 0, size); 

    try { 
        os.write(buf,0,size); 
    } catch (IOException e) { 
        // TODO Auto-generated catch block 
        e.printStackTrace(); 
    } 
} 


private native void createEngine(); 
private native int loadFile(String file, byte[] array); 

/** Load jni .so on initialization*/  
static { 
    System.loadLibrary("audioplayer");
} 
} 

And this is my C code.

jint Java_team_tj_audio_AudioPlayerActivity_loadFile(JNIEnv* env, jobject obj, jstring     file, jbyteArray array)
{
AVFormatContext *gFormatCtx = NULL;

AVCodecContext *gAudioCodecCtx = NULL;
AVCodec *gAudioCodec = NULL;
int gAudioStreamIdx = -1;
char *gAudioBuffer = NULL;

int i, outsize = 0;
AVPacket packet;
PacketQueue audioq;

const char *str;

str = (*env)->GetStringUTFChars(env, file, NULL);

jclass cls = (*env)->GetObjectClass(env, obj);

jmethodID play = (*env)->GetMethodID(env, cls, "playSound", "([BI)V");

if (gFormatCtx != NULL)
    return -1;

if (av_open_input_file(&gFormatCtx, str, NULL, 0, NULL) != 0)
    return -2;

if (av_find_stream_info(gFormatCtx) < 0)
    return -3;

for (i = 0; i < gFormatCtx->nb_streams; i++) {
    if (gFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
        gAudioStreamIdx = i;

        break;
    }
}

if (gAudioStreamIdx == -1)
    return -4;

gAudioCodecCtx = gFormatCtx->streams[gAudioStreamIdx]->codec;

gAudioCodec = avcodec_find_decoder(gAudioCodecCtx->codec_id);

if (gAudioCodec == NULL)
    return -5;

if (avcodec_open(gAudioCodecCtx, gAudioCodec) < 0)
    return -6;

gAudioBuffer =  (char *) av_malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE * 2);

while (av_read_frame(gFormatCtx, &packet) >= 0) {
    if (packet.stream_index == gAudioStreamIdx)
    {
        packet_queue_put(&audioq, &packet);
        int data_size = AVCODEC_MAX_AUDIO_FRAME_SIZE * 2;
        int size=packet.size;
        while(size > 0)
        {
       开发者_运维知识库     int len = avcodec_decode_audio3(gFormatCtx->streams[packet.stream_index]->codec,
                    (int16_t *) gAudioBuffer, &data_size, &packet);
            __android_log_print(ANDROID_LOG_INFO, "JNI", "bbbbbbbbbbbbbbbbb %d", len);
            size = packet.size-len;
            __android_log_print(ANDROID_LOG_INFO, "JNI", "bbbbbbbbbbbbbbbbb %d", packet.size);
            __android_log_print(ANDROID_LOG_INFO, "JNI", "bbbbbbbbbbbbbbbbb %d", data_size);
            if (data_size > 0) {
                jbyte *bytes = (*env)->GetByteArrayElements(env, array, NULL);
                memcpy(bytes, gAudioBuffer, data_size); //

                (*env)->ReleaseByteArrayElements(env, array, bytes, 0);

                (*env)->CallVoidMethod(env, obj, play, array, data_size);
            }

        }
    }
    else
        av_free_packet(&packet);
}

return 0;
}

What I did wrong?