diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
index eb4e67d..fb2e767 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerRenderer.cpp
@@ -425,14 +425,14 @@
 
         case kWhatDrainAudioQueue:
         {
+            mDrainAudioQueuePending = false;
+
             int32_t generation;
             CHECK(msg->findInt32("drainGeneration", &generation));
             if (generation != getDrainGeneration(true /* audio */)) {
                 break;
             }
 
-            mDrainAudioQueuePending = false;
-
             if (onDrainAudioQueue()) {
                 uint32_t numFramesPlayed;
                 CHECK_EQ(mAudioSink->getPosition(&numFramesPlayed),
@@ -1684,8 +1684,10 @@
                 onDisableOffloadAudio();
                 mCurrentOffloadInfo = AUDIO_INFO_INITIALIZER;
                 ALOGV("openAudioSink: offload failed");
+            } else {
+                mUseAudioCallback = true;  // offload mode transfers data through callback
+                ++mAudioDrainGeneration;  // discard pending kWhatDrainAudioQueue message.
             }
-            mUseAudioCallback = true;  // offload mode transfers data through callback
         }
     }
     if (!offloadOnly && !offloadingAudio()) {
@@ -1712,6 +1714,9 @@
         // Note: It is possible to set up the callback, but not use it to send audio data.
         // This requires a fix in AudioSink to explicitly specify the transfer mode.
         mUseAudioCallback = getUseAudioCallbackSetting();
+        if (mUseAudioCallback) {
+            ++mAudioDrainGeneration;  // discard pending kWhatDrainAudioQueue message.
+        }
 
         // Compute the desired buffer size.
         // For callback mode, the amount of time before wakeup is about half the buffer size.