commit b725c69f22a4142cf8a1f83e0cef0a342b796ada
author Andy Hung <hunga@google.com> Wed Dec 14 14:25:49 2022 -0800
committer Andy Hung <hunga@google.com> Wed Dec 28 11:43:56 2022 -0800
tree 8ba13f4cf8ad0e148ecc63c603c5f936da3ed9e3
parent 393de3a0861751727e1144795f186619a64ce835

Spatializer: Raise Spatializer-looper priority to RT

Prevents priority inversion when sending HT data to the Spatializer Effect
which was causing a stall of 15ms.

Test: adb shell 'ps -Tl -p $(pgrep audioserver)'
Bug: 261686532
Merged-In: I9746914d7f661ebe9a68ceaa09a37d9763ed43ef
Change-Id: I9746914d7f661ebe9a68ceaa09a37d9763ed43ef

services/audiopolicy/service/Spatializer.cpp

diff --git a/services/audiopolicy/service/Spatializer.cpp b/services/audiopolicy/service/Spatializer.cpp
index 3dc4490..2fe7b9e 100644
--- a/services/audiopolicy/service/Spatializer.cpp
+++ b/services/audiopolicy/service/Spatializer.cpp
@@ -34,6 +34,7 @@
 #include <media/stagefright/foundation/AMessage.h>
 #include <media/MediaMetricsItem.h>
 #include <media/ShmemCompat.h>
+#include <mediautils/SchedulingPolicyService.h>
 #include <mediautils/ServiceUtilities.h>
 #include <utils/Thread.h>
 
@@ -111,6 +112,14 @@
     };
 
     void onMessageReceived(const sp<AMessage> &msg) override {
+        // No ALooper method to get the tid so update
+        // Spatializer priority on the first message received.
+        std::call_once(mPrioritySetFlag, [](){
+            const pid_t pid = getpid();
+            const pid_t tid = gettid();
+            (void)requestSpatializerPriority(pid, tid);
+        });
+
         sp<Spatializer> spatializer = mSpatializer.promote();
         if (spatializer == nullptr) {
             ALOGW("%s: Cannot promote spatializer", __func__);
@@ -163,6 +172,7 @@
     }
 private:
     wp<Spatializer> mSpatializer;
+    std::once_flag mPrioritySetFlag;
 };
 
 const std::vector<const char *> Spatializer::sHeadPoseKeys = {