Revert "Fix uncertainty of one normal mix buffer in AudioTrack::getTimestamp"

This reverts commit 54464ba861aaafd11ee5645f5d1ecd1171c6e9fe.

Bug: 17733142.

Change-Id: I9886d40032b2f7d96bee03e600e14f78943d8052

3 files changed, 1 insertions, 23 deletions

diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index fe258ae..818bb05 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -2126,7 +2126,6 @@ ssize_t AudioFlinger::PlaybackThread::threadLoop_write()
             size_t totalFramesWritten = mNormalSink->framesWritten();
             if (totalFramesWritten >= mLatchD.mTimestamp.mPosition) {
                 mLatchD.mUnpresentedFrames = totalFramesWritten - mLatchD.mTimestamp.mPosition;
-                // mLatchD.mFramesReleased is set in threadloop_mix()
                 mLatchDValid = true;
             }
         }
@@ -3092,18 +3091,6 @@ void AudioFlinger::MixerThread::threadLoop_mix()
     sleepTime = 0;
     standbyTime = systemTime() + standbyDelay;
     //TODO: delay standby when effects have a tail
-
-    mLatchD.mFramesReleased.clear();
-    {
-        Mutex::Autolock _l(mLock);
-        size_t size = mActiveTracks.size();
-        for (size_t i = 0; i < size; i++) {
-            sp<Track> t = mActiveTracks[i].promote();
-            if (t != 0) {
-                mLatchD.mFramesReleased.add(t.get(), t->mAudioTrackServerProxy->framesReleased());
-            }
-        }
-    }
 }
 
 void AudioFlinger::MixerThread::threadLoop_sleepTime()
diff --git a/services/audioflinger/Threads.h b/services/audioflinger/Threads.h
index cda8095..fd025b5 100644
--- a/services/audioflinger/Threads.h
+++ b/services/audioflinger/Threads.h
@@ -819,7 +819,6 @@ private:
     struct {
         AudioTimestamp  mTimestamp;
         uint32_t        mUnpresentedFrames;
-        KeyedVector<Track *, uint32_t> mFramesReleased;
     } mLatchD, mLatchQ;
     bool mLatchDValid;  // true means mLatchD is valid, and clock it into latch at next opportunity
     bool mLatchQValid;  // true means mLatchQ is valid
diff --git a/services/audioflinger/Tracks.cpp b/services/audioflinger/Tracks.cpp
index 8c2bee4..c0a75b9 100644
--- a/services/audioflinger/Tracks.cpp
+++ b/services/audioflinger/Tracks.cpp
@@ -894,15 +894,7 @@ status_t AudioFlinger::PlaybackThread::Track::getTimestamp(AudioTimestamp& times
         uint32_t unpresentedFrames =
                 ((int64_t) playbackThread->mLatchQ.mUnpresentedFrames * mSampleRate) /
                 playbackThread->mSampleRate;
-        // FIXME Since we're using a raw pointer as the key, it is theoretically possible
-        //       for a brand new track to share the same address as a recently destroyed
-        //       track, and thus for us to get the frames released of the wrong track.
-        //       It is unlikely that we would be able to call getTimestamp() so quickly
-        //       right after creating a new track.  Nevertheless, the index here should
-        //       be changed to something that is unique.  Or use a completely different strategy.
-        ssize_t i = playbackThread->mLatchQ.mFramesReleased.indexOfKey(this);
-        uint32_t framesWritten = i >= 0 ?
-                playbackThread->mLatchQ.mFramesReleased[i] : mAudioTrackServerProxy->framesReleased();
+        uint32_t framesWritten = mAudioTrackServerProxy->framesReleased();
         bool checkPreviousTimestamp = mPreviousValid && framesWritten >= mPreviousFramesWritten;
         if (framesWritten < unpresentedFrames) {
             mPreviousValid = false;