Copy sei offset/size during ABuffer/MediaBuffer conversion

Bug: 20537676
Change-Id: I0bd11527ccd022c39d94b7877df81de4da1b14a6
diff --git a/media/libmediaplayerservice/nuplayer/GenericSource.cpp b/media/libmediaplayerservice/nuplayer/GenericSource.cpp
index b7a88e7..7eaa0e0 100644
--- a/media/libmediaplayerservice/nuplayer/GenericSource.cpp
+++ b/media/libmediaplayerservice/nuplayer/GenericSource.cpp
@@ -1400,6 +1400,14 @@
         meta->setInt32("trackIndex", mSubtitleTrack.mIndex);
     }
 
+    uint32_t dataType; // unused
+    const void *seiData;
+    size_t seiLength;
+    if (mb->meta_data()->findData(kKeySEI, &dataType, &seiData, &seiLength)) {
+        sp<ABuffer> sei = ABuffer::CreateAsCopy(seiData, seiLength);;
+        meta->setBuffer("sei", sei);
+    }
+
     if (actualTimeUs) {
         *actualTimeUs = timeUs;
     }