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/VideoEditorAudioPlayer.h b/libvideoeditor/lvpp/VideoEditorAudioPlayer.h
index 450a70a..2eab4c5 100755
--- a/libvideoeditor/lvpp/VideoEditorAudioPlayer.h
+++ b/libvideoeditor/lvpp/VideoEditorAudioPlayer.h
@@ -27,7 +27,7 @@
 #include "M4OSA_FileReader.h"
 #include "VideoEditorBGAudioProcessing.h"
 #include "AudioPlayerBase.h"
-#include "PreviewPlayerBase.h"
+#include "PreviewPlayer.h"
 
 namespace android {
 
@@ -44,7 +44,7 @@
     };
 
     VideoEditorAudioPlayer(const sp<MediaPlayerBase::AudioSink> &audioSink,
-        PreviewPlayerBase *audioObserver = NULL);
+        PreviewPlayer *audioObserver = NULL);
 
     virtual ~VideoEditorAudioPlayer();
 
@@ -58,7 +58,7 @@
         M4OSA_UInt32 pBGAudioCurrentMediaBeginCutTS,
         M4OSA_UInt32 pBGAudioCurrentMediaVolumeVal);
 
-    void setObserver(PreviewPlayerBase *observer);
+    void setObserver(PreviewPlayer *observer);
     void setSource(const sp<MediaSource> &source);
     sp<MediaSource> getSource();