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/TrackBase.h

diff --git a/services/audioflinger/TrackBase.h b/services/audioflinger/TrackBase.h
index 95da9d7..a43cb75 100644
--- a/services/audioflinger/TrackBase.h
+++ b/services/audioflinger/TrackBase.h
@@ -187,6 +187,19 @@
                             return status;
                         }
 
+           // TODO: Consider making this external.
+           struct FrameTime {
+               int64_t frames;
+               int64_t timeNs;
+           };
+
+           // KernelFrameTime is updated per "mix" period even for non-pcm tracks.
+           void         getKernelFrameTime(FrameTime *ft) const {
+                           *ft = mKernelFrameTime.load();
+                        }
+
+           audio_format_t format() const { return mFormat; }
+
 protected:
     DISALLOW_COPY_AND_ASSIGN(TrackBase);
 
@@ -198,8 +211,6 @@
     // but putting it in TrackBase avoids the complexity of virtual inheritance
     virtual size_t  framesReady() const { return SIZE_MAX; }
 
-    audio_format_t format() const { return mFormat; }
-
     uint32_t channelCount() const { return mChannelCount; }
 
     audio_channel_mask_t channelMask() const { return mChannelMask; }
@@ -307,6 +318,7 @@
     bool                mServerLatencySupported = false;
     std::atomic<bool>   mServerLatencyFromTrack{}; // latency from track or server timestamp.
     std::atomic<double> mServerLatencyMs{};        // last latency pushed from server thread.
+    std::atomic<FrameTime> mKernelFrameTime{};     // last frame time on kernel side.
 };
 
 // PatchProxyBufferProvider interface is implemented by PatchTrack and PatchRecord.