diff --git a/media/libstagefright/ACodec.cpp b/media/libstagefright/ACodec.cpp
index f11791c..5bca317 100644
--- a/media/libstagefright/ACodec.cpp
+++ b/media/libstagefright/ACodec.cpp
@@ -17,6 +17,8 @@
 //#define LOG_NDEBUG 0
 #define LOG_TAG "ACodec"
 
+#include <utils/Trace.h>
+
 #include <media/stagefright/ACodec.h>
 
 #include <binder/MemoryDealer.h>
@@ -3681,6 +3683,7 @@
     if (mCodec->mNativeWindow != NULL
             && msg->findInt32("render", &render) && render != 0
             && info->mData != NULL && info->mData->size() != 0) {
+        ATRACE_NAME("render");
         // The client wants this buffer to be rendered.
 
         status_t err;
@@ -3693,6 +3696,10 @@
             info->mStatus = BufferInfo::OWNED_BY_US;
         }
     } else {
+        if (mCodec->mNativeWindow != NULL &&
+            (info->mData == NULL || info->mData->size() != 0)) {
+            ATRACE_NAME("frame-drop");
+        }
         info->mStatus = BufferInfo::OWNED_BY_US;
     }