Fix AudioTrack::flush()

It was only flushing at a surface level, and even then only the first time
the server observed the client's flush request.  Now it flushes at a
deeper level, but there may be even deeper device-specific flushing.

Bug: 9770947
Change-Id: I687cc3410ff9e5e5d4a5dcb9e3b129501e53d247

1 files changed, 2 insertions, 0 deletions

diff --git a/media/libmedia/AudioTrackShared.cpp b/media/libmedia/AudioTrackShared.cpp
index 5f8f292..6bb4ff7 100644
--- a/media/libmedia/AudioTrackShared.cpp
+++ b/media/libmedia/AudioTrackShared.cpp
@@ -388,6 +388,8 @@ status_t ServerProxy::obtainBuffer(Buffer* buffer)
         if (flush != mFlush) {
             front = rear;
             mFlush = flush;
+            // effectively obtain then release whatever is in the buffer
+            android_atomic_release_store(rear, &cblk->u.mStreaming.mFront);
         } else {
             front = cblk->u.mStreaming.mFront;
         }