More source code Clean up in video editor engine

o fixed incorrect design and got rid of PreviewPlayerBase class
o removed obsolete/unused code as much as possible and reformatted the source code
o verified and passed functional tests
o More to come ...

Change-Id: I7a89162f8b9d9ea6eabcf0457366cd2f6d970d11
diff --git a/libvideoeditor/lvpp/AudioPlayerBase.h b/libvideoeditor/lvpp/AudioPlayerBase.h
index 31b9fa2..b39d4a2 100644
--- a/libvideoeditor/lvpp/AudioPlayerBase.h
+++ b/libvideoeditor/lvpp/AudioPlayerBase.h
@@ -27,7 +27,7 @@
 
 class MediaSource;
 class AudioTrack;
-class PreviewPlayerBase;
+class PreviewPlayer;
 
 class AudioPlayerBase : public TimeSource {
 public:
@@ -37,7 +37,7 @@
     };
 
     AudioPlayerBase(const sp<MediaPlayerBase::AudioSink> &audioSink,
-                PreviewPlayerBase *audioObserver = NULL);
+                PreviewPlayer *audioObserver = NULL);
 
     virtual ~AudioPlayerBase();
 
@@ -93,7 +93,7 @@
     MediaBuffer *mFirstBuffer;
 
     sp<MediaPlayerBase::AudioSink> mAudioSink;
-    PreviewPlayerBase *mObserver;
+    PreviewPlayer *mObserver;
 
     static void AudioCallback(int event, void *user, void *info);
     void AudioCallback(int event, void *info);