diff --git a/drm/libmediadrm/DrmMetricsLogger.cpp b/drm/libmediadrm/DrmMetricsLogger.cpp
index 89b1dcc..de6d097 100644
--- a/drm/libmediadrm/DrmMetricsLogger.cpp
+++ b/drm/libmediadrm/DrmMetricsLogger.cpp
@@ -63,6 +63,8 @@
 DrmStatus DrmMetricsLogger::createPlugin(const uint8_t uuid[IDRM_UUID_SIZE],
                                          const String8& appPackageName) {
     std::memcpy(mUuid.data(), uuid, IDRM_UUID_SIZE);
+    mUuid[0] = betoh64(mUuid[0]);
+    mUuid[1] = betoh64(mUuid[1]);
     if (kUuidSchemeMap.count(mUuid)) {
         mScheme = kUuidSchemeMap.at(mUuid);
     } else {
@@ -460,8 +462,8 @@
 void DrmMetricsLogger::reportMediaDrmCreated() const {
     mediametrics_handle_t handle(mediametrics_create("mediadrm.created"));
     mediametrics_setCString(handle, "scheme", mScheme.c_str());
-    mediametrics_setInt64(handle, "uuid_msb", be64toh(mUuid[0]));
-    mediametrics_setInt64(handle, "uuid_lsb", be64toh(mUuid[1]));
+    mediametrics_setInt64(handle, "uuid_msb", mUuid[0]);
+    mediametrics_setInt64(handle, "uuid_lsb", mUuid[1]);
     mediametrics_setInt32(handle, "frontend", mFrontend);
     mediametrics_setCString(handle, "object_nonce", mObjNonce.c_str());
     mediametrics_selfRecord(handle);
@@ -471,8 +473,8 @@
 void DrmMetricsLogger::reportMediaDrmSessionOpened(const std::vector<uint8_t>& sessionId) const {
     mediametrics_handle_t handle(mediametrics_create("mediadrm.session_opened"));
     mediametrics_setCString(handle, "scheme", mScheme.c_str());
-    mediametrics_setInt64(handle, "uuid_msb", be64toh(mUuid[0]));
-    mediametrics_setInt64(handle, "uuid_lsb", be64toh(mUuid[1]));
+    mediametrics_setInt64(handle, "uuid_msb", mUuid[0]);
+    mediametrics_setInt64(handle, "uuid_lsb", mUuid[1]);
     mediametrics_setInt32(handle, "frontend", mFrontend);
     mediametrics_setCString(handle, "object_nonce", mObjNonce.c_str());
     const std::lock_guard<std::mutex> lock(mSessionMapMutex);
@@ -490,8 +492,8 @@
                                              const std::vector<uint8_t>& sessionId) const {
     mediametrics_handle_t handle(mediametrics_create("mediadrm.errored"));
     mediametrics_setCString(handle, "scheme", mScheme.c_str());
-    mediametrics_setInt64(handle, "uuid_msb", be64toh(mUuid[0]));
-    mediametrics_setInt64(handle, "uuid_lsb", be64toh(mUuid[1]));
+    mediametrics_setInt64(handle, "uuid_msb", mUuid[0]);
+    mediametrics_setInt64(handle, "uuid_lsb", mUuid[1]);
     mediametrics_setInt32(handle, "frontend", mFrontend);
     mediametrics_setCString(handle, "object_nonce", mObjNonce.c_str());
     if (!sessionId.empty()) {
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 0de7e7d..00b612f 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -2140,9 +2140,19 @@
     if (!isStreamInitialized()) {
         ALOGE("The stream is not open yet"); // This should not happen.
     } else {
-        // setEventCallback will need a strong pointer as a parameter. Calling it
-        // here instead of constructor of PlaybackThread so that the onFirstRef
-        // callback would not be made on an incompletely constructed object.
+        // Callbacks take strong or weak pointers as a parameter.
+        // Since PlaybackThread passes itself as a callback handler, it can only
+        // be done outside of the constructor. Creating weak and especially strong
+        // pointers to a refcounted object in its own constructor is strongly
+        // discouraged, see comments in system/core/libutils/include/utils/RefBase.h.
+        // Even if a function takes a weak pointer, it is possible that it will
+        // need to convert it to a strong pointer down the line.
+        if (mOutput->flags & AUDIO_OUTPUT_FLAG_NON_BLOCKING &&
+                mOutput->stream->setCallback(this) == OK) {
+            mUseAsyncWrite = true;
+            mCallbackThread = new AudioFlinger::AsyncCallbackThread(this);
+        }
+
         if (mOutput->stream->setEventCallback(this) != OK) {
             ALOGD("Failed to add event callback");
         }
@@ -3007,13 +3017,6 @@
                 mFrameCount);
     }
 
-    if (mOutput->flags & AUDIO_OUTPUT_FLAG_NON_BLOCKING) {
-        if (mOutput->stream->setCallback(this) == OK) {
-            mUseAsyncWrite = true;
-            mCallbackThread = new AudioFlinger::AsyncCallbackThread(this);
-        }
-    }
-
     mHwSupportsPause = false;
     if (mOutput->flags & AUDIO_OUTPUT_FLAG_DIRECT) {
         bool supportsPause = false, supportsResume = false;