public boolean isPlaying() {
        if(mCurrentState.ordinal() >= State.RELEASING.ordinal()) {
            mCurrentState = State.ERROR;
            throw new IllegalStateException();
        }

        return mPlaybackThread != null && !mPlaybackThread.isPaused();
    }
Gets the current playback speed. See {@link #setPlaybackSpeed(float)} for details.
@return the current playback speed
MediaPlayer/src/main/java/net/protyposis/android/mediaplayer/MediaPlayer.java