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.cpp b/libvideoeditor/lvpp/VideoEditorAudioPlayer.cpp
index b3d63ed..0b642ac 100755
--- a/libvideoeditor/lvpp/VideoEditorAudioPlayer.cpp
+++ b/libvideoeditor/lvpp/VideoEditorAudioPlayer.cpp
@@ -34,7 +34,7 @@
 
 VideoEditorAudioPlayer::VideoEditorAudioPlayer(
         const sp<MediaPlayerBase::AudioSink> &audioSink,
-        PreviewPlayerBase *observer)
+        PreviewPlayer *observer)
     : AudioPlayerBase(audioSink, observer) {
 
     ALOGV("VideoEditorAudioPlayer");
@@ -96,7 +96,7 @@
     return mSource;
 }
 
-void VideoEditorAudioPlayer::setObserver(PreviewPlayerBase *observer) {
+void VideoEditorAudioPlayer::setObserver(PreviewPlayer *observer) {
     ALOGV("setObserver");
     //CHECK(!mStarted);
     mObserver = observer;