Use audio_format_t consistently

Change-Id: Idb08c49fe1a2c87ea2bb080815a5a6f95409834c
diff --git a/libvideoeditor/lvpp/VideoEditorPlayer.h b/libvideoeditor/lvpp/VideoEditorPlayer.h
index 6b10b36..684a2e6 100755
--- a/libvideoeditor/lvpp/VideoEditorPlayer.h
+++ b/libvideoeditor/lvpp/VideoEditorPlayer.h
@@ -50,7 +50,7 @@
 
         virtual status_t        open(
                 uint32_t sampleRate, int channelCount,
-                int format, int bufferCount,
+                audio_format_t format, int bufferCount,
                 AudioCallback cb, void *cookie);
 
         virtual void            start();