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
Change-Id: I9746914d7f661ebe9a68ceaa09a37d9763ed43ef
diff --git a/media/utils/SchedulingPolicyService.cpp b/media/utils/SchedulingPolicyService.cpp
index ad38862..6e515ff 100644
--- a/media/utils/SchedulingPolicyService.cpp
+++ b/media/utils/SchedulingPolicyService.cpp
@@ -18,6 +18,7 @@
//#define LOG_NDEBUG 0
#include <binder/IServiceManager.h>
+#include <cutils/properties.h>
#include <utils/Mutex.h>
#include "ISchedulingPolicyService.h"
#include "mediautils/SchedulingPolicyService.h"
@@ -86,4 +87,25 @@
return ret;
}
+int requestSpatializerPriority(pid_t pid, pid_t tid) {
+ if (pid == -1 || tid == -1) return BAD_VALUE;
+
+ // update priority to RT if specified.
+ constexpr int32_t kRTPriorityMin = 1;
+ constexpr int32_t kRTPriorityMax = 3;
+ const int32_t priorityBoost =
+ property_get_int32("audio.spatializer.priority", kRTPriorityMin);
+ if (priorityBoost >= kRTPriorityMin && priorityBoost <= kRTPriorityMax) {
+ const status_t status = requestPriority(
+ pid, tid, priorityBoost, false /* isForApp */, true /*asynchronous*/);
+ if (status != OK) {
+ ALOGW("%s: Cannot request spatializer priority boost %d, status:%d",
+ __func__, priorityBoost, status);
+ return status < 0 ? status : UNKNOWN_ERROR;
+ }
+ return priorityBoost;
+ }
+ return 0; // no boost requested
+}
+
} // namespace android
diff --git a/media/utils/include/mediautils/SchedulingPolicyService.h b/media/utils/include/mediautils/SchedulingPolicyService.h
index 546cec5..af1fcd2 100644
--- a/media/utils/include/mediautils/SchedulingPolicyService.h
+++ b/media/utils/include/mediautils/SchedulingPolicyService.h
@@ -23,7 +23,7 @@
class IBinder;
// Request elevated priority for thread tid, whose thread group leader must be pid.
-// The priority parameter is currently restricted to either 1 or 2.
+// The priority parameter is currently restricted from 1 to 3.
// The asynchronous parameter should be 'true' to return immediately,
// after the request is enqueued but not necessarily executed.
// The default value 'false' means to return after request has been enqueued and executed.
@@ -37,6 +37,12 @@
// 'client' is ignored in this case.
int requestCpusetBoost(bool enable, const sp<IBinder> &client);
+// Audio: Request Spatializer RT priority for thread tid, whose thread group leader must be pid.
+// returns positive value if successful, the RT priority used
+// zero, if no RT priority selected
+// negative status code if RT priority unable to be set.
+int requestSpatializerPriority(pid_t pid, pid_t tid);
+
} // namespace android
#endif // _ANDROID_SCHEDULING_POLICY_SERVICE_H