commit 2812d9ea3a3a33142dd8e23c9d949c498d6f7a12
author Phil Burk <philburk@google.com> Mon Jan 04 10:34:30 2016 -0800
committer Phil Burk <philburk@google.com> Sat Jan 16 11:21:38 2016 -0800
tree 5079c758817d0c42b3f7ade661366fdae25fe5d1
parent e0db30868d9734f95a02df516dd0dc6a7226474b

AudioTrack: Add getUnderrunCount()

This allows an app to detect application-level output glitches.
Underrun counts survive track recreation.

Change-Id: I8eb14e92f6fc1007718a29b0666ab51ace30cdb8
Bug: 25641253
Signed-off-by: Phil Burk <philburk@google.com>

media/libmedia/AudioTrack.cpp

diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index 5e14940..31e88c3 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -493,6 +493,7 @@
     mPreviousTimestampValid = false;
     mTimestampStartupGlitchReported = false;
     mRetrogradeMotionReported = false;
+    mUnderrunCountOffset = 0;
 
     return NO_ERROR;
 }
@@ -2112,6 +2113,9 @@
         return DEAD_OBJECT;
     }
 
+    // Save so we can return count since creation.
+    mUnderrunCountOffset = getUnderrunCount_l();
+
     // save the old static buffer position
     size_t bufferPosition = 0;
     int loopCount = 0;
@@ -2427,6 +2431,17 @@
     return NO_ERROR;
 }
 
+uint32_t AudioTrack::getUnderrunCount() const
+{
+    AutoMutex lock(mLock);
+    return getUnderrunCount_l();
+}
+
+uint32_t AudioTrack::getUnderrunCount_l() const
+{
+    return mProxy->getUnderrunCount() + mUnderrunCountOffset;
+}
+
 uint32_t AudioTrack::getUnderrunFrames() const
 {
     AutoMutex lock(mLock);