audio: Fix race condition in AudioTrack underrun.
When audio flinger mixer removes an AudioTrack from the
active list in case of underrun, it is possible that the
client has written a full buffer just after the underrun detection and
is blocked waiting for more space to write. In this case, the client
will never detect the DISABLED flag and the track never be restarted.
Also implement missing DISABLE flag detection in server side audio tracks
(OutputTrack and PatchTrack).
bug: 27567768
Change-Id: I8d0753429d4113498258b1f61bd8ac5939a612f0
diff --git a/include/private/media/AudioTrackShared.h b/include/private/media/AudioTrackShared.h
index ea8a78e..2dfb850 100644
--- a/include/private/media/AudioTrackShared.h
+++ b/include/private/media/AudioTrackShared.h
@@ -268,6 +268,8 @@
// DEAD_OBJECT Server has died or invalidated, caller should destroy this proxy and re-create.
// -EINTR Call has been interrupted. Look around to see why, and then perhaps try again.
// NO_INIT Shared memory is corrupt.
+ // NOT_ENOUGH_DATA Server has disabled the track because of underrun: restart the track
+ // if still in active state.
// Assertion failure on entry, if buffer == NULL or buffer->mFrameCount == 0.
status_t obtainBuffer(Buffer* buffer, const struct timespec *requested = NULL,
struct timespec *elapsed = NULL);