stagefright: limit audio gap for looped playback

The audio gap when looping audio is mostly due to
a delay requested by the audio player when executing
the end of stream message. This is to allow the audio
to be drained out of the pipe before actually stopping the
AudioTrack.
This delay is not needed when looping as the AudioTrack
is not stopped.

The fix consists in ignoring the requested delay when the
looping flag is set in awesome player.

Issue 5800981.

Change-Id: Ib32d2930c53ecebc21ca8440e6e054c7e20db4a5

Author: Eric Laurent

media/libstagefright/AwesomePlayer.cpp

@@ -1841,6 +1841,10 @@ void AwesomePlayer::postCheckAudioStatusEvent(int64_t delayUs) {
         return;
     }
     mAudioStatusEventPending = true;
+    // Do not honor delay when looping in order to limit audio gap
+    if (mFlags & (LOOPING | AUTO_LOOPING)) {
+        delayUs = 0;
+    }
     mQueue.postEventWithDelay(mCheckAudioStatusEvent, delayUs);
 }