Update comments

Change-Id: I327663a020670d0a72ff57bd0b682e2ce0528650

4 files changed, 14 insertions, 3 deletions

diff --git a/services/audioflinger/AudioFlinger.cpp b/services/audioflinger/AudioFlinger.cpp
index d83d19a..85168ce 100644
--- a/services/audioflinger/AudioFlinger.cpp
+++ b/services/audioflinger/AudioFlinger.cpp
@@ -4261,7 +4261,7 @@ void AudioFlinger::RecordThread::RecordTrack::stop()
         RecordThread *recordThread = (RecordThread *)thread.get();
         recordThread->stop(this);
         TrackBase::reset();
-        // Force overerrun condition to avoid false overrun callback until first data is
+        // Force overrun condition to avoid false overrun callback until first data is
         // read from buffer
         android_atomic_or(CBLK_UNDERRUN_ON, &mCblk->flags);
     }
diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index 0e4b24a..7a57613 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -899,6 +899,7 @@ public:
     protected:
         SortedVector< wp<Track> >       mActiveTracks;
 
+        // Allocate a track name.  Returns name >= 0 if successful, -1 on failure.
         virtual int             getTrackName_l() = 0;
         virtual void            deleteTrackName_l(int name) = 0;
         virtual uint32_t        activeSleepTimeUs();
@@ -1559,9 +1560,10 @@ mutable Mutex               mLock;      // mutex for process, commands and handl
         uint32_t mNewLeftVolume;       // new volume on left channel
         uint32_t mNewRightVolume;      // new volume on right channel
         uint32_t mStrategy; // strategy for this effect chain
-        // mSuspendedEffects lists all effect currently suspended in the chain
-        // use effect type UUID timelow field as key. There is no real risk of identical
+        // mSuspendedEffects lists all effects currently suspended in the chain.
+        // Use effect type UUID timelow field as key. There is no real risk of identical
         // timeLow fields among effect type UUIDs.
+        // Updated by updateSuspendedSessions_l() only.
         KeyedVector< int, sp<SuspendedEffectDesc> > mSuspendedEffects;
     };
 
diff --git a/services/audioflinger/AudioMixer.cpp b/services/audioflinger/AudioMixer.cpp
index 1ec238b..bd4c939 100644
--- a/services/audioflinger/AudioMixer.cpp
+++ b/services/audioflinger/AudioMixer.cpp
@@ -57,6 +57,10 @@ AudioMixer::AudioMixer(size_t frameCount, uint32_t sampleRate)
     mState.outputTemp   = NULL;
     mState.resampleTemp = NULL;
     // mState.reserved
+
+    // FIXME Most of the following initialization is probably redundant since
+    // tracks[i] should only be referenced if (mTrackNames & (1 << i)) != 0
+    // and mTrackNames is initially 0.  However, leave it here until that's verified.
     track_t* t = mState.tracks;
     for (unsigned i=0 ; i < MAX_NUM_TRACKS ; i++) {
         t->needs = 0;
diff --git a/services/audioflinger/AudioMixer.h b/services/audioflinger/AudioMixer.h
index b210212..ab80a9a 100644
--- a/services/audioflinger/AudioMixer.h
+++ b/services/audioflinger/AudioMixer.h
@@ -70,9 +70,14 @@ public:
 
 
     // For all APIs with "name": TRACK0 <= name < TRACK0 + MAX_NUM_TRACKS
+
+    // Allocate a track name.  Returns new track name if successful, -1 on failure.
     int         getTrackName();
+
+    // Free an allocated track by name
     void        deleteTrackName(int name);
 
+    // Enable or disable an allocated track by name
     void        enable(int name);
     void        disable(int name);