A/V synchronization at the beginning of a recording session

o do not use edts/elst boxes since these optional boxes are ignored
o manipulate the first video/audio frame duration to make sure that the rest
  of the audio/video is in sync (ideally, we should only manipulate
  the vidoe frame duration, not the audio)
o reduce the initial audio mute/suppression period, which is used to
  eliminate the "recording" sound.

bug - 3405882 and 3362703

Change-Id: Ib0acfb4f3843b365157288951dc122b006299c18

1 files changed, 3 insertions, 3 deletions

diff --git a/include/media/stagefright/AudioSource.h b/include/media/stagefright/AudioSource.h
index b35a6e6..9e6f0e2 100644
--- a/include/media/stagefright/AudioSource.h
+++ b/include/media/stagefright/AudioSource.h
@@ -59,12 +59,12 @@ private:
 
         // After the initial mute, we raise the volume linearly
         // over kAutoRampDurationUs.
-        kAutoRampDurationUs = 700000,
+        kAutoRampDurationUs = 300000,
 
         // This is the initial mute duration to suppress
         // the video recording signal tone
-        kAutoRampStartUs = 1000000,
-      };
+        kAutoRampStartUs = 0,
+    };
 
     Mutex mLock;
     Condition mFrameAvailableCondition;