Android

How can I change tempo of a jetfile in android?

public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_live_counting_vr);
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
            cardboardView = (GvrView) findViewById(R.id.cardboard_view);
            cardboardView.setRenderer(this);
            setGvrView(cardboardView);
    }

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
 
    <com.google.vrtoolkit.cardboard.CardboardView
        android:id="@+id/cardboard_view"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true" />
 
</RelativeLayout>

// these lines are only in the test app
InputStream inS = getResources ().getAssets ().open ("testmp4.mp4");

int length = inS.available ();
byte[] data = new byte[length];
inS.read (data);
inS.close ();

// in the real world, the other stuff gives me a byte[] array and my code starts here
m_memFile = new MemoryFile (null, length);
m_memFile.writeBytes (data, 0, 0, length);

Method getFD = MemoryFile.class.getMethod ("getFileDescriptor");
m_memFileFD = (FileDescriptor) getFD.invoke (m_memFile);

if (m_player == null)
{
    m_player = new MyPlayer (MainActivity.this.m_events, MainActivity.this.m_memFileFD, MainActivity.this.m_memFile.length (), (SurfaceView) findViewById (R.id.viewerMediaVideo));
}
m_player.play ();

protected MediaExtractor m_extractor  = null;
protected PlayerStates   m_state     = PlayerStates.STOPPED;
private SurfaceHolder    m_surface     = null;
protected FileDescriptor m_memFileFD  = null;
protected long           m_memFileLen = 0;

public MyPlayer (PlayerEvents ev, FileDescriptor fd, long len, SurfaceView s)
{
    m_events = ev;
    m_memFileFD = fd;
    m_memFileLen = len;
    m_surface = s.getHolder ();
}

public void play ()
{
    if (m_state == PlayerStates.STOPPED)
    {
        m_stop = false;
        new Thread (this).start ();
    }
    ...
}

public void run ()
{
    android.os.Process.setThreadPriority (Process.THREAD_PRIORITY_URGENT_AUDIO);

    m_extractor = new MediaExtractor ();
    try
    {
        m_extractor.setDataSource (m_memFileFD, 0, m_memFileLen);
    }
    catch (final Exception excp)
    {
        m_extractor.release ();
        m_extractor = null;

        m_handler.post (new Runnable (){public void run ()
                       {m_events.onError ("can't create extractor: " + excp.getMessage ()); } });
        return;
    }
    ....
}