media: discard duplicate CEA-608 ctrl code

bug: 19297083
Change-Id: I6c108e2c597e7b3fd770306a26e110208dc5ece0

1 files changed, 11 insertions, 1 deletions

diff --git a/media/java/android/media/ClosedCaptionRenderer.java b/media/java/android/media/ClosedCaptionRenderer.java
index d34b21b..e3680e9 100644
--- a/media/java/android/media/ClosedCaptionRenderer.java
+++ b/media/java/android/media/ClosedCaptionRenderer.java
@@ -154,6 +154,7 @@ class CCParser {
 
     private int mMode = MODE_PAINT_ON;
     private int mRollUpSize = 4;
+    private int mPrevCtrlCode = INVALID;
 
     private CCMemory mDisplay = new CCMemory();
     private CCMemory mNonDisplay = new CCMemory();
@@ -260,6 +261,13 @@ class CCParser {
 
     private boolean handleCtrlCode(CCData ccData) {
         int ctrlCode = ccData.getCtrlCode();
+
+        if (mPrevCtrlCode != INVALID && mPrevCtrlCode == ctrlCode) {
+            // discard double ctrl codes (but if there's a 3rd one, we still take that)
+            mPrevCtrlCode = INVALID;
+            return true;
+        }
+
         switch(ctrlCode) {
         case RCL:
             // select pop-on style
@@ -325,10 +333,12 @@ class CCParser {
             break;
         case INVALID:
         default:
-            // not handled
+            mPrevCtrlCode = INVALID;
             return false;
         }
 
+        mPrevCtrlCode = ctrlCode;
+
         // handled
         return true;
     }