audiopolicy: Defer release of output session effects

 * Some effects modules are racy and don't tolerate being destroyed
   and immediately resurrected on the same session. This is
   the common case when switching tracks, and the use of default
   output effects makes the problem even worse. Certain apps
   which handle gapless in a sloppy way are also to blame.
 * Instead of immediately nuking the entire descriptor with the
   stream, just decrease the refcount and defer it for 10 seconds.
   If it needs resurrected, the refcount will be increased and
   the delayed release command will not shoot it in the face.

Change-Id: I068dd72c4180023a74eb9ccbe8a180f6f0683dbf

1 files changed, 6 insertions, 0 deletions

diff --git a/services/audiopolicy/service/AudioPolicyEffects.h b/services/audiopolicy/service/AudioPolicyEffects.h
index 2023784..7988515 100644
--- a/services/audiopolicy/service/AudioPolicyEffects.h
+++ b/services/audiopolicy/service/AudioPolicyEffects.h
@@ -86,6 +86,12 @@ public:
                              audio_stream_type_t stream,
                              int audioSession);
 
+    // For deferred release
+    status_t doReleaseOutputSessionEffects(audio_io_handle_t output,
+                                           audio_stream_type_t stream,
+                                           int audioSession);
+
+
 private:
 
     // class to store the description of an effects and its parameters