commit fa4303dcbeac79452f35c078c8008f5c2e7622b7
author Chong Zhang <chz@google.com> Wed Aug 12 16:32:00 2015 -0700
committer Chong Zhang <chz@google.com> Thu Aug 13 16:53:05 2015 +0000
tree f4fe78f77a587c26b3a618905a1ff7233a12dc96
parent 45d31391e6922dee2bbf9f6745f0a5545858eb63

adjust audio timestamp to account for AudioRecord latency

bug: 22953017
Change-Id: Iccd1bb406ff68aa8bc3ccec35c8128625894f6ae

media/libstagefright/AudioSource.cpp

diff --git a/media/libstagefright/AudioSource.cpp b/media/libstagefright/AudioSource.cpp
index 3505844..6e4a1dd 100644
--- a/media/libstagefright/AudioSource.cpp
+++ b/media/libstagefright/AudioSource.cpp
@@ -290,6 +290,10 @@
 
 status_t AudioSource::dataCallback(const AudioRecord::Buffer& audioBuffer) {
     int64_t timeUs = systemTime() / 1000ll;
+    // Estimate the real sampling time of the 1st sample in this buffer
+    // from AudioRecord's latency. (Apply this adjustment first so that
+    // the start time logic is not affected.)
+    timeUs -= mRecord->latency() * 1000LL;
 
     ALOGV("dataCallbackTimestamp: %" PRId64 " us", timeUs);
     Mutex::Autolock autoLock(mLock);