commit 30282562329b3031b6bfa0869bd76ff5f543ebba
author Andy Hung <hunga@google.com> Wed Aug 08 18:27:03 2018 -0700
committer Andy Hung <hunga@google.com> Mon Aug 13 16:27:59 2018 -0700
tree 82ba1641c178b26419735faf7f99be6bc1ffc9c1
parent 182d359515fbf4ba0fc14709b583c29edce30897

AudioFlinger: Add patch latency for direct record/playback

This relies on being able to obtain presentation position and
capture position accurately from the HAL, in the presence
of potential underruns or overruns.

Test: MSD hal dumpsys
Bug: 112428710
Change-Id: I9aad574baaff60b5e0c5d8c39a2147d19ee613f5

services/audioflinger/Tracks.cpp

diff --git a/services/audioflinger/Tracks.cpp b/services/audioflinger/Tracks.cpp
index 8ad06f0..78e6c6c 100644
--- a/services/audioflinger/Tracks.cpp
+++ b/services/audioflinger/Tracks.cpp
@@ -1258,6 +1258,16 @@
 void AudioFlinger::PlaybackThread::Track::updateTrackFrameInfo(
         int64_t trackFramesReleased, int64_t sinkFramesWritten,
         uint32_t halSampleRate, const ExtendedTimestamp &timeStamp) {
+   // Make the kernel frametime available.
+    const FrameTime ft{
+            timeStamp.mPosition[ExtendedTimestamp::LOCATION_KERNEL],
+            timeStamp.mTimeNs[ExtendedTimestamp::LOCATION_KERNEL]};
+    // ALOGD("FrameTime: %lld %lld", (long long)ft.frames, (long long)ft.timeNs);
+    mKernelFrameTime.store(ft);
+    if (!audio_is_linear_pcm(mFormat)) {
+        return;
+    }
+
     //update frame map
     mFrameMap.push(trackFramesReleased, sinkFramesWritten);
 
@@ -1886,6 +1896,16 @@
         int64_t trackFramesReleased, int64_t sourceFramesRead,
         uint32_t halSampleRate, const ExtendedTimestamp &timestamp)
 {
+   // Make the kernel frametime available.
+    const FrameTime ft{
+            timestamp.mPosition[ExtendedTimestamp::LOCATION_KERNEL],
+            timestamp.mTimeNs[ExtendedTimestamp::LOCATION_KERNEL]};
+    // ALOGD("FrameTime: %lld %lld", (long long)ft.frames, (long long)ft.timeNs);
+    mKernelFrameTime.store(ft);
+    if (!audio_is_linear_pcm(mFormat)) {
+        return;
+    }
+
     ExtendedTimestamp local = timestamp;
 
     // Convert HAL frames to server-side track frames at track sample rate.