commit bd096fd9d8e5fc0e62f98807f4818a06f70d0812
author Glenn Kasten <gkasten@google.com> Fri Aug 23 13:53:56 2013 -0700
committer Glenn Kasten <gkasten@google.com> Thu Aug 29 09:59:31 2013 -0700
tree 8ff27bce9f34e4bdd0f8e233494a24efef475a7d
parent 573d80a8f463f648a515fc0975bf83951b272993

Implement Track::getTimestamp()

using a new timestamp latch in PlaybackThread, and
AudioTrackServerProxy::framesReleased() which returns mServer.

Change-Id: I1ebfba968c773faaab95648c272fd3ebd74718d6

services/audioflinger/Tracks.cpp

diff --git a/services/audioflinger/Tracks.cpp b/services/audioflinger/Tracks.cpp
index 687217b..9622709 100644
--- a/services/audioflinger/Tracks.cpp
+++ b/services/audioflinger/Tracks.cpp
@@ -724,7 +724,19 @@
     }
     Mutex::Autolock _l(thread->mLock);
     PlaybackThread *playbackThread = (PlaybackThread *)thread.get();
-    return INVALID_OPERATION;
+    if (!playbackThread->mLatchQValid) {
+        return INVALID_OPERATION;
+    }
+    uint32_t unpresentedFrames =
+            ((int64_t) playbackThread->mLatchQ.mUnpresentedFrames * mSampleRate) /
+            playbackThread->mSampleRate;
+    uint32_t framesWritten = mAudioTrackServerProxy->framesReleased();
+    if (framesWritten < unpresentedFrames) {
+        return INVALID_OPERATION;
+    }
+    timestamp.mPosition = framesWritten - unpresentedFrames;
+    timestamp.mTime = playbackThread->mLatchQ.mTimestamp.mTime;
+    return NO_ERROR;
 }
 
 status_t AudioFlinger::PlaybackThread::Track::attachAuxEffect(int EffectId)