diff --git a/apex/testing/Android.bp b/apex/testing/Android.bp
index 376d3e4..a04ab3f 100644
--- a/apex/testing/Android.bp
+++ b/apex/testing/Android.bp
@@ -17,6 +17,7 @@
     manifest: "test_manifest.json",
     file_contexts: ":com.android.media-file_contexts",
     defaults: ["com.android.media-defaults"],
+    prebuilts: ["sdkinfo_45"],
     installable: false,
 }
 
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 849c050..024168b 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -7366,8 +7366,10 @@
 
         // Update server timestamp with server stats
         // systemTime() is optional if the hardware supports timestamps.
-        mTimestamp.mPosition[ExtendedTimestamp::LOCATION_SERVER] += framesRead;
-        mTimestamp.mTimeNs[ExtendedTimestamp::LOCATION_SERVER] = lastIoEndNs;
+        if (framesRead >= 0) {
+            mTimestamp.mPosition[ExtendedTimestamp::LOCATION_SERVER] += framesRead;
+            mTimestamp.mTimeNs[ExtendedTimestamp::LOCATION_SERVER] = lastIoEndNs;
+        }
 
         // Update server timestamp with kernel stats
         if (mPipeSource.get() == nullptr /* don't obtain for FastCapture, could block */) {