diff --git a/include/private/media/AudioTrackShared.h b/include/private/media/AudioTrackShared.h
index fe42afa..6a86a00 100644
--- a/include/private/media/AudioTrackShared.h
+++ b/include/private/media/AudioTrackShared.h
@@ -33,28 +33,15 @@
 #define WAIT_PERIOD_MS          10
 #define RESTORE_TIMEOUT_MS      5000    // Maximum waiting time for a track to be restored
 
-#define CBLK_UNDERRUN_MSK       0x0001
-#define CBLK_UNDERRUN_ON        0x0001  // underrun (out) or overrrun (in) indication
-#define CBLK_UNDERRUN_OFF       0x0000  // no underrun
-#define CBLK_DIRECTION_MSK      0x0002
-#define CBLK_DIRECTION_OUT      0x0002  // this cblk is for an AudioTrack
-#define CBLK_DIRECTION_IN       0x0000  // this cblk is for an AudioRecord
-#define CBLK_FORCEREADY_MSK     0x0004
-#define CBLK_FORCEREADY_ON      0x0004  // track is considered ready immediately by AudioFlinger
-#define CBLK_FORCEREADY_OFF     0x0000  // track is ready when buffer full
-#define CBLK_INVALID_MSK        0x0008
-#define CBLK_INVALID_ON         0x0008  // track buffer is invalidated by AudioFlinger:
-#define CBLK_INVALID_OFF        0x0000  // must be re-created
-#define CBLK_DISABLED_MSK       0x0010
-#define CBLK_DISABLED_ON        0x0010  // track disabled by AudioFlinger due to underrun:
-#define CBLK_DISABLED_OFF       0x0000  // must be re-started
-#define CBLK_RESTORING_MSK      0x0020
-#define CBLK_RESTORING_ON       0x0020  // track is being restored after invalidation
-#define CBLK_RESTORING_OFF      0x0000  // by AudioFlinger
-#define CBLK_RESTORED_MSK       0x0040
-#define CBLK_RESTORED_ON        0x0040  // track has been restored after invalidation
-#define CBLK_RESTORED_OFF       0x0040  // by AudioFlinger
-#define CBLK_FAST               0x0080  // AudioFlinger successfully created a fast track
+#define CBLK_UNDERRUN   0x01 // set: underrun (out) or overrrun (in), clear: no underrun or overrun
+#define CBLK_DIRECTION  0x02 // set: cblk is for an AudioTrack, clear: for AudioRecord
+#define CBLK_FORCEREADY 0x04 // set: track is considered ready immediately by AudioFlinger,
+                             // clear: track is ready when buffer full
+#define CBLK_INVALID    0x08 // track buffer invalidated by AudioFlinger, need to re-create
+#define CBLK_DISABLED   0x10 // track disabled by AudioFlinger due to underrun, need to re-start
+#define CBLK_RESTORING  0x20 // track is being restored after invalidation by AudioFlinger
+#define CBLK_RESTORED   0x40 // track has been restored after invalidation by AudioFlinger
+#define CBLK_FAST       0x80 // AudioFlinger successfully created a fast track
 
 // Important: do not add any virtual methods, including ~
 struct audio_track_cblk_t
diff --git a/media/libmedia/AudioRecord.cpp b/media/libmedia/AudioRecord.cpp
index bdbee0d..bd558fa 100644
--- a/media/libmedia/AudioRecord.cpp
+++ b/media/libmedia/AudioRecord.cpp
@@ -292,16 +292,16 @@
         mActive = true;
 
         cblk->lock.lock();
-        if (!(cblk->flags & CBLK_INVALID_MSK)) {
+        if (!(cblk->flags & CBLK_INVALID)) {
             cblk->lock.unlock();
             ALOGV("mAudioRecord->start()");
             ret = mAudioRecord->start(event, triggerSession);
             cblk->lock.lock();
             if (ret == DEAD_OBJECT) {
-                android_atomic_or(CBLK_INVALID_ON, &cblk->flags);
+                android_atomic_or(CBLK_INVALID, &cblk->flags);
             }
         }
-        if (cblk->flags & CBLK_INVALID_MSK) {
+        if (cblk->flags & CBLK_INVALID) {
             ret = restoreRecord_l(cblk);
         }
         cblk->lock.unlock();
@@ -466,7 +466,7 @@
     mCblkMemory = cblk;
     mCblk = static_cast<audio_track_cblk_t*>(cblk->pointer());
     mCblk->buffers = (char*)mCblk + sizeof(audio_track_cblk_t);
-    android_atomic_and(~CBLK_DIRECTION_MSK, &mCblk->flags);
+    android_atomic_and(~CBLK_DIRECTION, &mCblk->flags);
     mCblk->bufferTimeoutMs = MAX_RUN_TIMEOUT_MS;
     mCblk->waitTimeMs = 0;
     return NO_ERROR;
@@ -499,7 +499,7 @@
                 cblk->lock.unlock();
                 return WOULD_BLOCK;
             }
-            if (!(cblk->flags & CBLK_INVALID_MSK)) {
+            if (!(cblk->flags & CBLK_INVALID)) {
                 mLock.unlock();
                 result = cblk->cv.waitRelative(cblk->lock, milliseconds(waitTimeMs));
                 cblk->lock.unlock();
@@ -509,7 +509,7 @@
                 }
                 cblk->lock.lock();
             }
-            if (cblk->flags & CBLK_INVALID_MSK) {
+            if (cblk->flags & CBLK_INVALID) {
                 goto create_new_record;
             }
             if (CC_UNLIKELY(result != NO_ERROR)) {
@@ -522,7 +522,7 @@
                     result = mAudioRecord->start(AudioSystem::SYNC_EVENT_SAME, 0);
                     cblk->lock.lock();
                     if (result == DEAD_OBJECT) {
-                        android_atomic_or(CBLK_INVALID_ON, &cblk->flags);
+                        android_atomic_or(CBLK_INVALID, &cblk->flags);
 create_new_record:
                         result = AudioRecord::restoreRecord_l(cblk);
                     }
@@ -739,7 +739,7 @@
         // The value of active is stale, but we are almost sure to be active here because
         // otherwise we would have exited when obtainBuffer returned STOPPED earlier.
         ALOGV("Overrun user: %x, server: %x, flags %04x", cblk->user, cblk->server, cblk->flags);
-        if (!(android_atomic_or(CBLK_UNDERRUN_ON, &cblk->flags) & CBLK_UNDERRUN_MSK)) {
+        if (!(android_atomic_or(CBLK_UNDERRUN, &cblk->flags) & CBLK_UNDERRUN)) {
             mCbf(EVENT_OVERRUN, mUserData, NULL);
         }
     }
@@ -759,7 +759,7 @@
 {
     status_t result;
 
-    if (!(android_atomic_or(CBLK_RESTORING_ON, &cblk->flags) & CBLK_RESTORING_MSK)) {
+    if (!(android_atomic_or(CBLK_RESTORING, &cblk->flags) & CBLK_RESTORING)) {
         ALOGW("dead IAudioRecord, creating a new one");
         // signal old cblk condition so that other threads waiting for available buffers stop
         // waiting now
@@ -780,10 +780,10 @@
         }
 
         // signal old cblk condition for other threads waiting for restore completion
-        android_atomic_or(CBLK_RESTORED_ON, &cblk->flags);
+        android_atomic_or(CBLK_RESTORED, &cblk->flags);
         cblk->cv.broadcast();
     } else {
-        if (!(cblk->flags & CBLK_RESTORED_MSK)) {
+        if (!(cblk->flags & CBLK_RESTORED)) {
             ALOGW("dead IAudioRecord, waiting for a new one to be created");
             mLock.unlock();
             result = cblk->cv.waitRelative(cblk->lock, milliseconds(RESTORE_TIMEOUT_MS));
diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index ffed161..5bd1aa7 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -391,7 +391,7 @@
         cblk->lock.lock();
         cblk->bufferTimeoutMs = MAX_STARTUP_TIMEOUT_MS;
         cblk->waitTimeMs = 0;
-        android_atomic_and(~CBLK_DISABLED_ON, &cblk->flags);
+        android_atomic_and(~CBLK_DISABLED, &cblk->flags);
         if (t != 0) {
             t->resume();
         } else {
@@ -402,16 +402,16 @@
 
         ALOGV("start %p before lock cblk %p", this, mCblk);
         status_t status = NO_ERROR;
-        if (!(cblk->flags & CBLK_INVALID_MSK)) {
+        if (!(cblk->flags & CBLK_INVALID)) {
             cblk->lock.unlock();
             ALOGV("mAudioTrack->start()");
             status = mAudioTrack->start();
             cblk->lock.lock();
             if (status == DEAD_OBJECT) {
-                android_atomic_or(CBLK_INVALID_ON, &cblk->flags);
+                android_atomic_or(CBLK_INVALID, &cblk->flags);
             }
         }
-        if (cblk->flags & CBLK_INVALID_MSK) {
+        if (cblk->flags & CBLK_INVALID) {
             status = restoreTrack_l(cblk, true);
         }
         cblk->lock.unlock();
@@ -691,7 +691,7 @@
     if (position > mCblk->user) return BAD_VALUE;
 
     mCblk->server = position;
-    android_atomic_or(CBLK_FORCEREADY_ON, &mCblk->flags);
+    android_atomic_or(CBLK_FORCEREADY, &mCblk->flags);
 
     return NO_ERROR;
 }
@@ -905,7 +905,7 @@
     mCblkMemory = cblk;
     mCblk = static_cast<audio_track_cblk_t*>(cblk->pointer());
     // old has the previous value of mCblk->flags before the "or" operation
-    int32_t old = android_atomic_or(CBLK_DIRECTION_OUT, &mCblk->flags);
+    int32_t old = android_atomic_or(CBLK_DIRECTION, &mCblk->flags);
     if (flags & AUDIO_OUTPUT_FLAG_FAST) {
         if (old & CBLK_FAST) {
             ALOGV("AUDIO_OUTPUT_FLAG_FAST successful; frameCount %u", mCblk->frameCount);
@@ -959,7 +959,7 @@
     uint32_t framesAvail = cblk->framesAvailable();
 
     cblk->lock.lock();
-    if (cblk->flags & CBLK_INVALID_MSK) {
+    if (cblk->flags & CBLK_INVALID) {
         goto create_new_track;
     }
     cblk->lock.unlock();
@@ -978,7 +978,7 @@
                 cblk->lock.unlock();
                 return WOULD_BLOCK;
             }
-            if (!(cblk->flags & CBLK_INVALID_MSK)) {
+            if (!(cblk->flags & CBLK_INVALID)) {
                 mLock.unlock();
                 result = cblk->cv.waitRelative(cblk->lock, milliseconds(waitTimeMs));
                 cblk->lock.unlock();
@@ -989,7 +989,7 @@
                 cblk->lock.lock();
             }
 
-            if (cblk->flags & CBLK_INVALID_MSK) {
+            if (cblk->flags & CBLK_INVALID) {
                 goto create_new_track;
             }
             if (CC_UNLIKELY(result != NO_ERROR)) {
@@ -1005,7 +1005,7 @@
                         result = mAudioTrack->start();
                         cblk->lock.lock();
                         if (result == DEAD_OBJECT) {
-                            android_atomic_or(CBLK_INVALID_ON, &cblk->flags);
+                            android_atomic_or(CBLK_INVALID, &cblk->flags);
 create_new_track:
                             result = restoreTrack_l(cblk, false);
                         }
@@ -1063,8 +1063,8 @@
     mCblk->stepUser(audioBuffer->frameCount);
     if (audioBuffer->frameCount > 0) {
         // restart track if it was disabled by audioflinger due to previous underrun
-        if (mActive && (mCblk->flags & CBLK_DISABLED_MSK)) {
-            android_atomic_and(~CBLK_DISABLED_ON, &mCblk->flags);
+        if (mActive && (mCblk->flags & CBLK_DISABLED)) {
+            android_atomic_and(~CBLK_DISABLED, &mCblk->flags);
             ALOGW("releaseBuffer() track %p name=%#x disabled, restarting", this, mCblk->mName);
             mAudioTrack->start();
         }
@@ -1149,16 +1149,16 @@
     // If the track is not invalid already, try to allocate a buffer.  alloc
     // fails indicating that the server is dead, flag the track as invalid so
     // we can attempt to restore in just a bit.
-    if (!(mCblk->flags & CBLK_INVALID_MSK)) {
+    if (!(mCblk->flags & CBLK_INVALID)) {
         result = mAudioTrack->allocateTimedBuffer(size, buffer);
         if (result == DEAD_OBJECT) {
-            android_atomic_or(CBLK_INVALID_ON, &mCblk->flags);
+            android_atomic_or(CBLK_INVALID, &mCblk->flags);
         }
     }
 
     // If the track is invalid at this point, attempt to restore it. and try the
     // allocation one more time.
-    if (mCblk->flags & CBLK_INVALID_MSK) {
+    if (mCblk->flags & CBLK_INVALID) {
         mCblk->lock.lock();
         result = restoreTrack_l(mCblk, false);
         mCblk->lock.unlock();
@@ -1178,8 +1178,8 @@
         AutoMutex lock(mLock);
         // restart track if it was disabled by audioflinger due to previous underrun
         if (buffer->size() != 0 && status == NO_ERROR &&
-                mActive && (mCblk->flags & CBLK_DISABLED_MSK)) {
-            android_atomic_and(~CBLK_DISABLED_ON, &mCblk->flags);
+                mActive && (mCblk->flags & CBLK_DISABLED)) {
+            android_atomic_and(~CBLK_DISABLED, &mCblk->flags);
             ALOGW("queueTimedBuffer() track %p disabled, restarting", this);
             mAudioTrack->start();
         }
@@ -1213,7 +1213,7 @@
     // Manage underrun callback
     if (active && (cblk->framesAvailable() == cblk->frameCount)) {
         ALOGV("Underrun user: %x, server: %x, flags %04x", cblk->user, cblk->server, cblk->flags);
-        if (!(android_atomic_or(CBLK_UNDERRUN_ON, &cblk->flags) & CBLK_UNDERRUN_MSK)) {
+        if (!(android_atomic_or(CBLK_UNDERRUN, &cblk->flags) & CBLK_UNDERRUN)) {
             mCbf(EVENT_UNDERRUN, mUserData, 0);
             if (cblk->server == cblk->frameCount) {
                 mCbf(EVENT_BUFFER_END, mUserData, 0);
@@ -1333,7 +1333,7 @@
 {
     status_t result;
 
-    if (!(android_atomic_or(CBLK_RESTORING_ON, &cblk->flags) & CBLK_RESTORING_MSK)) {
+    if (!(android_atomic_or(CBLK_RESTORING, &cblk->flags) & CBLK_RESTORING)) {
         ALOGW("dead IAudioTrack, creating a new one from %s TID %d",
             fromStart ? "start()" : "obtainBuffer()", gettid());
 
@@ -1381,8 +1381,8 @@
                         memset(mCblk->buffers, 0, frames * mCblk->frameSize);
                     }
                     // restart playback even if buffer is not completely filled.
-                    android_atomic_or(CBLK_FORCEREADY_ON, &mCblk->flags);
-                    // stepUser() clears CBLK_UNDERRUN_ON flag enabling underrun callbacks to
+                    android_atomic_or(CBLK_FORCEREADY, &mCblk->flags);
+                    // stepUser() clears CBLK_UNDERRUN flag enabling underrun callbacks to
                     // the client
                     mCblk->stepUser(frames);
                 }
@@ -1399,17 +1399,17 @@
             }
         }
         if (result != NO_ERROR) {
-            android_atomic_and(~CBLK_RESTORING_ON, &cblk->flags);
+            android_atomic_and(~CBLK_RESTORING, &cblk->flags);
             ALOGW_IF(result != NO_ERROR, "restoreTrack_l() failed status %d", result);
         }
         mRestoreStatus = result;
         // signal old cblk condition for other threads waiting for restore completion
-        android_atomic_or(CBLK_RESTORED_ON, &cblk->flags);
+        android_atomic_or(CBLK_RESTORED, &cblk->flags);
         cblk->cv.broadcast();
     } else {
         bool haveLogged = false;
         for (;;) {
-            if (cblk->flags & CBLK_RESTORED_MSK) {
+            if (cblk->flags & CBLK_RESTORED) {
                 ALOGW("dead IAudioTrack restored");
                 result = mRestoreStatus;
                 cblk->lock.unlock();
@@ -1534,7 +1534,7 @@
     uint32_t u = user;
     u += frameCount;
     // Ensure that user is never ahead of server for AudioRecord
-    if (flags & CBLK_DIRECTION_MSK) {
+    if (flags & CBLK_DIRECTION) {
         // If stepServer() has been called once, switch to normal obtainBuffer() timeout period
         if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS-1) {
             bufferTimeoutMs = MAX_RUN_TIMEOUT_MS;
@@ -1558,8 +1558,8 @@
     user = u;
 
     // Clear flow control error condition as new data has been written/read to/from buffer.
-    if (flags & CBLK_UNDERRUN_MSK) {
-        android_atomic_and(~CBLK_UNDERRUN_MSK, &flags);
+    if (flags & CBLK_UNDERRUN) {
+        android_atomic_and(~CBLK_UNDERRUN, &flags);
     }
 
     return u;
@@ -1578,7 +1578,7 @@
     bool flushed = (s == user);
 
     s += frameCount;
-    if (flags & CBLK_DIRECTION_MSK) {
+    if (flags & CBLK_DIRECTION) {
         // Mark that we have read the first buffer so that next time stepUser() is called
         // we switch to normal obtainBuffer() timeout period
         if (bufferTimeoutMs == MAX_STARTUP_TIMEOUT_MS) {
@@ -1616,7 +1616,7 @@
 
     server = s;
 
-    if (!(flags & CBLK_INVALID_MSK)) {
+    if (!(flags & CBLK_INVALID)) {
         cv.signal();
     }
     lock.unlock();
@@ -1639,7 +1639,7 @@
     uint32_t u = user;
     uint32_t s = server;
 
-    if (flags & CBLK_DIRECTION_MSK) {
+    if (flags & CBLK_DIRECTION) {
         uint32_t limit = (s < loopStart) ? s : loopStart;
         return limit + frameCount - u;
     } else {
@@ -1652,7 +1652,7 @@
     uint32_t u = user;
     uint32_t s = server;
 
-    if (flags & CBLK_DIRECTION_MSK) {
+    if (flags & CBLK_DIRECTION) {
         if (u < loopEnd) {
             return u - s;
         } else {
diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index 35bd431..5f2f441 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -2167,7 +2167,7 @@
     for (size_t i = 0; i < mTracks.size(); ++i) {
         sp<Track> track = mTracks[i];
         if (sessionId == track->sessionId() &&
-                !(track->mCblk->flags & CBLK_INVALID_MSK)) {
+                !(track->mCblk->flags & CBLK_INVALID)) {
             result |= TRACK_SESSION;
             break;
         }
@@ -2186,7 +2186,7 @@
     for (size_t i = 0; i < mTracks.size(); i++) {
         sp<Track> track = mTracks[i];
         if (sessionId == track->sessionId() &&
-                !(track->mCblk->flags & CBLK_INVALID_MSK)) {
+                !(track->mCblk->flags & CBLK_INVALID)) {
             return AudioSystem::getStrategyForStream(track->streamType());
         }
     }
@@ -3032,7 +3032,7 @@
                     }
                     // indicate to client process that the track was disabled because of underrun;
                     // it will then automatically call start() when data is available
-                    android_atomic_or(CBLK_DISABLED_ON, &track->mCblk->flags);
+                    android_atomic_or(CBLK_DISABLED, &track->mCblk->flags);
                     // remove from active list, but state remains ACTIVE [confusing but true]
                     isActive = false;
                     break;
@@ -3314,7 +3314,7 @@
                     tracksToRemove->add(track);
                     // indicate to client process that the track was disabled because of underrun;
                     // it will then automatically call start() when data is available
-                    android_atomic_or(CBLK_DISABLED_ON, &cblk->flags);
+                    android_atomic_or(CBLK_DISABLED, &cblk->flags);
                 // If one track is not ready, mark the mixer also not ready if:
                 //  - the mixer was ready during previous round OR
                 //  - no other track is ready
@@ -3447,7 +3447,7 @@
     for (size_t i = 0; i < size; i++) {
         sp<Track> t = mTracks[i];
         if (t->streamType() == streamType) {
-            android_atomic_or(CBLK_INVALID_ON, &t->mCblk->flags);
+            android_atomic_or(CBLK_INVALID, &t->mCblk->flags);
             t->mCblk->cv.signal();
         }
     }
@@ -4227,7 +4227,7 @@
                     memset(mBuffer, 0, frameCount*channelCount*sizeof(int16_t));
                     // Force underrun condition to avoid false underrun callback until first data is
                     // written to buffer (other flags are cleared)
-                    mCblk->flags = CBLK_UNDERRUN_ON;
+                    mCblk->flags = CBLK_UNDERRUN;
                 } else {
                     mBuffer = sharedBuffer->pointer();
                 }
@@ -4256,7 +4256,7 @@
         memset(mBuffer, 0, frameCount*channelCount*sizeof(int16_t));
         // Force underrun condition to avoid false underrun callback until first data is
         // written to buffer (other flags are cleared)
-        mCblk->flags = CBLK_UNDERRUN_ON;
+        mCblk->flags = CBLK_UNDERRUN;
         mBufferEnd = (uint8_t *)mBuffer + bufferSize;
     }
 }
@@ -4600,9 +4600,9 @@
     if (mFillingUpStatus != FS_FILLING || isStopped() || isPausing()) return true;
 
     if (framesReady() >= mCblk->frameCount ||
-            (mCblk->flags & CBLK_FORCEREADY_MSK)) {
+            (mCblk->flags & CBLK_FORCEREADY)) {
         mFillingUpStatus = FS_FILLED;
-        android_atomic_and(~CBLK_FORCEREADY_MSK, &mCblk->flags);
+        android_atomic_and(~CBLK_FORCEREADY, &mCblk->flags);
         return true;
     }
     return false;
@@ -4745,8 +4745,8 @@
         TrackBase::reset();
         // Force underrun condition to avoid false underrun callback until first data is
         // written to buffer
-        android_atomic_and(~CBLK_FORCEREADY_MSK, &mCblk->flags);
-        android_atomic_or(CBLK_UNDERRUN_ON, &mCblk->flags);
+        android_atomic_and(~CBLK_FORCEREADY, &mCblk->flags);
+        android_atomic_or(CBLK_UNDERRUN, &mCblk->flags);
         mFillingUpStatus = FS_FILLING;
         mResetDone = true;
         if (mState == FLUSHED) {
@@ -5495,7 +5495,7 @@
             TrackBase::reset();
             // Force overrun condition to avoid false overrun callback until first data is
             // read from buffer
-            android_atomic_or(CBLK_UNDERRUN_ON, &mCblk->flags);
+            android_atomic_or(CBLK_UNDERRUN, &mCblk->flags);
         }
         recordThread->mLock.unlock();
         if (doStop) {
@@ -5540,7 +5540,7 @@
 {
 
     if (mCblk != NULL) {
-        mCblk->flags |= CBLK_DIRECTION_OUT;
+        mCblk->flags |= CBLK_DIRECTION;
         mCblk->buffers = (char*)mCblk + sizeof(audio_track_cblk_t);
         mOutBuffer.frameCount = 0;
         playbackThread->mTracks.add(this);