AudioTrack: extend callback thread sleep time

Do not force wake up the AudioTrack thread every 10ms if no timed
events (loop, markers..) have to be processed.
This will help reduce power consumption.

Change-Id: Icb425b13800690008dd07c27ffac84739e3dbba3

1 files changed, 6 insertions, 1 deletions

diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index 7509239..c2c6715 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -1078,6 +1078,11 @@ bool AudioTrack::processAudioBuffer(const sp<AudioTrackThread>& thread)
         frames = mRemainingFrames;
     }
 
+    int32_t waitCount = -1;
+    if (mUpdatePeriod || (!mMarkerReached && mMarkerPosition) || mLoopCount) {
+        waitCount = 1;
+    }
+
     do {
 
         audioBuffer.frameCount = frames;
@@ -1085,7 +1090,7 @@ bool AudioTrack::processAudioBuffer(const sp<AudioTrackThread>& thread)
         // Calling obtainBuffer() with a wait count of 1
         // limits wait time to WAIT_PERIOD_MS. This prevents from being
         // stuck here not being able to handle timed events (position, markers, loops).
-        status_t err = obtainBuffer(&audioBuffer, 1);
+        status_t err = obtainBuffer(&audioBuffer, waitCount);
         if (err < NO_ERROR) {
             if (err != TIMED_OUT) {
                 LOGE_IF(err != status_t(NO_MORE_BUFFERS), "Error obtaining an audio buffer, giving up.");