libmedia: correct latency computing of AudioRecord

- Originally, audio record latency is calculated by frame
  buffers allocated for this track, while the actual
  latency is determined by audio hal.
- Compute the track latency by frame count returned
  from audio hal when in TRANSFER_CALLBACK mode

Change-Id: I26e5e47e8cc3720895b962f7aab8a595a54b7c83

1 files changed, 5 insertions, 1 deletions

diff --git a/media/libmedia/AudioRecord.cpp b/media/libmedia/AudioRecord.cpp
index 6dc52cd..66903b3 100644
--- a/media/libmedia/AudioRecord.cpp
+++ b/media/libmedia/AudioRecord.cpp
@@ -276,7 +276,11 @@ status_t AudioRecord::set(
     mActive = false;
     mUserData = user;
     // TODO: add audio hardware input latency here
-    mLatency = (1000*mFrameCount) / sampleRate;
+    if (mTransfer == TRANSFER_CALLBACK) {
+        mLatency = (1000*mNotificationFramesAct) / sampleRate;
+    } else {
+        mLatency = (1000*mFrameCount) / sampleRate;
+    }
     mMarkerPosition = 0;
     mMarkerReached = false;
     mNewPosition = 0;