diff --git a/media/libaudioclient/AudioRecord.cpp b/media/libaudioclient/AudioRecord.cpp
index d29aa74..13198e8 100644
--- a/media/libaudioclient/AudioRecord.cpp
+++ b/media/libaudioclient/AudioRecord.cpp
@@ -507,6 +507,18 @@
 }
 
 // -------------------------------------------------------------------------
+// TODO Move this macro to a common header file for enum to string conversion in audio framework.
+#define MEDIA_CASE_ENUM(name) case name: return #name
+const char * AudioRecord::convertTransferToText(transfer_type transferType) {
+    switch (transferType) {
+        MEDIA_CASE_ENUM(TRANSFER_DEFAULT);
+        MEDIA_CASE_ENUM(TRANSFER_CALLBACK);
+        MEDIA_CASE_ENUM(TRANSFER_OBTAIN);
+        MEDIA_CASE_ENUM(TRANSFER_SYNC);
+        default:
+            return "UNRECOGNIZED";
+    }
+}
 
 // must be called with mLock held
 status_t AudioRecord::openRecord_l(const Modulo<uint32_t> &epoch, const String16& opPackageName)
@@ -590,12 +602,20 @@
             (mTransfer == TRANSFER_SYNC) ||
             // use case 3: obtain/release mode
             (mTransfer == TRANSFER_OBTAIN);
+        if (!useCaseAllowed) {
+            ALOGW("AUDIO_INPUT_FLAG_FAST denied, incompatible transfer = %s",
+                  convertTransferToText(mTransfer));
+        }
+
         // sample rates must also match
-        bool fastAllowed = useCaseAllowed && (mSampleRate == afSampleRate);
+        bool sampleRateAllowed = mSampleRate == afSampleRate;
+        if (!sampleRateAllowed) {
+            ALOGW("AUDIO_INPUT_FLAG_FAST denied, rates do not match %u Hz, require %u Hz",
+                  mSampleRate, afSampleRate);
+        }
+
+        bool fastAllowed = useCaseAllowed && sampleRateAllowed;
         if (!fastAllowed) {
-            ALOGW("AUDIO_INPUT_FLAG_FAST denied by client; transfer %d, "
-                "track %u Hz, input %u Hz",
-                mTransfer, mSampleRate, afSampleRate);
             mFlags = (audio_input_flags_t) (mFlags & ~(AUDIO_INPUT_FLAG_FAST |
                     AUDIO_INPUT_FLAG_RAW));
             AudioSystem::releaseInput(input, mSessionId);
diff --git a/media/libaudioclient/AudioTrack.cpp b/media/libaudioclient/AudioTrack.cpp
index 98ec7d7..e1805a7 100644
--- a/media/libaudioclient/AudioTrack.cpp
+++ b/media/libaudioclient/AudioTrack.cpp
@@ -1268,6 +1268,20 @@
     }
 }
 
+// TODO Move this macro to a common header file for enum to string conversion in audio framework.
+#define MEDIA_CASE_ENUM(name) case name: return #name
+const char * AudioTrack::convertTransferToText(transfer_type transferType) {
+    switch (transferType) {
+        MEDIA_CASE_ENUM(TRANSFER_DEFAULT);
+        MEDIA_CASE_ENUM(TRANSFER_CALLBACK);
+        MEDIA_CASE_ENUM(TRANSFER_OBTAIN);
+        MEDIA_CASE_ENUM(TRANSFER_SYNC);
+        MEDIA_CASE_ENUM(TRANSFER_SHARED);
+        default:
+            return "UNRECOGNIZED";
+    }
+}
+
 status_t AudioTrack::createTrack_l()
 {
     const sp<IAudioFlinger>& audioFlinger = AudioSystem::get_audio_flinger();
@@ -1343,22 +1357,32 @@
 
     // Client can only express a preference for FAST.  Server will perform additional tests.
     if (mFlags & AUDIO_OUTPUT_FLAG_FAST) {
-        bool useCaseAllowed =
-            // either of these use cases:
-            // use case 1: shared buffer
-            (mSharedBuffer != 0) ||
+        // either of these use cases:
+        // use case 1: shared buffer
+        bool sharedBuffer = mSharedBuffer != 0;
+        bool transferAllowed =
             // use case 2: callback transfer mode
             (mTransfer == TRANSFER_CALLBACK) ||
             // use case 3: obtain/release mode
             (mTransfer == TRANSFER_OBTAIN) ||
             // use case 4: synchronous write
             ((mTransfer == TRANSFER_SYNC) && mThreadCanCallJava);
+
+        bool useCaseAllowed = sharedBuffer || transferAllowed;
+        if (!useCaseAllowed) {
+            ALOGW("AUDIO_OUTPUT_FLAG_FAST denied, not shared buffer and transfer = %s",
+                  convertTransferToText(mTransfer));
+        }
+
         // sample rates must also match
-        bool fastAllowed = useCaseAllowed && (mSampleRate == mAfSampleRate);
+        bool sampleRateAllowed = mSampleRate == mAfSampleRate;
+        if (!sampleRateAllowed) {
+            ALOGW("AUDIO_OUTPUT_FLAG_FAST denied, rates do not match %u Hz, require %u Hz",
+                  mSampleRate, mAfSampleRate);
+        }
+
+        bool fastAllowed = useCaseAllowed && sampleRateAllowed;
         if (!fastAllowed) {
-            ALOGW("AUDIO_OUTPUT_FLAG_FAST denied by client; transfer %d, "
-                "track %u Hz, output %u Hz",
-                mTransfer, mSampleRate, mAfSampleRate);
             mFlags = (audio_output_flags_t) (mFlags & ~AUDIO_OUTPUT_FLAG_FAST);
         }
     }
diff --git a/media/libaudioclient/include/media/AudioRecord.h b/media/libaudioclient/include/media/AudioRecord.h
index 1b034b5..825a0a0 100644
--- a/media/libaudioclient/include/media/AudioRecord.h
+++ b/media/libaudioclient/include/media/AudioRecord.h
@@ -334,6 +334,12 @@
      */
             status_t getTimestamp(ExtendedTimestamp *timestamp);
 
+    /**
+     * @param transferType
+     * @return text string that matches the enum name
+     */
+    static const char * convertTransferToText(transfer_type transferType);
+
     /* Returns a handle on the audio input used by this AudioRecord.
      *
      * Parameters:
diff --git a/media/libaudioclient/include/media/AudioTrack.h b/media/libaudioclient/include/media/AudioTrack.h
index 5d73df3..c5dfedc 100644
--- a/media/libaudioclient/include/media/AudioTrack.h
+++ b/media/libaudioclient/include/media/AudioTrack.h
@@ -564,6 +564,12 @@
      */
             status_t    reload();
 
+    /**
+     * @param transferType
+     * @return text string that matches the enum name
+     */
+            static const char * convertTransferToText(transfer_type transferType);
+
     /* Returns a handle on the audio output used by this AudioTrack.
      *
      * Parameters: