libmedia: avoid processing stale callback events when track recycled

when track is reused from SoundPool and started again, the
previous callback events could be processed immediately after
track started, the new playback will be stopped then

clear the stale cblk flags when recycled track is started again to
avoid triggering unexpected callback events

Change-Id: Ifc6fd973c655e9c7866391e7004016a7df9a9b9c
CRs-Fixed: 819973

1 files changed, 6 insertions, 0 deletions

diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index 64eba73..fccc6dd 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -533,6 +533,12 @@ status_t AudioTrack::start()
         // force refresh of remaining frames by processAudioBuffer() as last
         // write before stop could be partial.
         mRefreshRemaining = true;
+
+       // for static track, clear the old flags when start from stopped state
+       if (mSharedBuffer != 0)
+           android_atomic_and(
+           ~(CBLK_LOOP_CYCLE | CBLK_LOOP_FINAL | CBLK_BUFFER_END),
+           &mCblk->mFlags);
     }
     mNewPosition = mPosition + mUpdatePeriod;
     int32_t flags = android_atomic_and(~CBLK_DISABLED, &mCblk->mFlags);