Merge "Remove timing jitter during startup of audio" into jb-mr2-dev
diff --git a/include/media/AudioTrack.h b/include/media/AudioTrack.h
index db5a7ab..64f82bb 100644
--- a/include/media/AudioTrack.h
+++ b/include/media/AudioTrack.h
@@ -599,6 +599,7 @@
int mPreviousPriority; // before start()
SchedPolicy mPreviousSchedulingGroup;
AudioTrackClientProxy* mProxy;
+ bool mAwaitBoost; // thread should wait for priority boost before running
};
class TimedAudioTrack : public AudioTrack
diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index 1bd839f..7eeb4f8 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -893,9 +893,11 @@
ALOGW("Requested frameCount %u but received frameCount %u", frameCount, temp);
}
frameCount = temp;
+ mAwaitBoost = false;
if (flags & AUDIO_OUTPUT_FLAG_FAST) {
if (trackFlags & IAudioFlinger::TRACK_FAST) {
ALOGV("AUDIO_OUTPUT_FLAG_FAST successful; frameCount %u", frameCount);
+ mAwaitBoost = true;
} else {
ALOGV("AUDIO_OUTPUT_FLAG_FAST denied by server; frameCount %u", frameCount);
// once denied, do not request again if IAudioTrack is re-created
@@ -1219,6 +1221,25 @@
size_t writtenSize;
mLock.lock();
+ if (mAwaitBoost) {
+ mAwaitBoost = false;
+ mLock.unlock();
+ static const int32_t kMaxTries = 5;
+ int32_t tryCounter = kMaxTries;
+ uint32_t pollUs = 10000;
+ do {
+ int policy = sched_getscheduler(0);
+ if (policy == SCHED_FIFO || policy == SCHED_RR) {
+ break;
+ }
+ usleep(pollUs);
+ pollUs <<= 1;
+ } while (tryCounter-- > 0);
+ if (tryCounter < 0) {
+ ALOGE("did not receive expected priority boost on time");
+ }
+ return true;
+ }
// acquire a strong reference on the IMemory and IAudioTrack so that they cannot be destroyed
// while we are accessing the cblk
sp<IAudioTrack> audioTrack = mAudioTrack;
diff --git a/services/audioflinger/FastMixer.cpp b/services/audioflinger/FastMixer.cpp
index 24a6dfe..21df1d7 100644
--- a/services/audioflinger/FastMixer.cpp
+++ b/services/audioflinger/FastMixer.cpp
@@ -170,6 +170,10 @@
if (old <= 0) {
__futex_syscall4(coldFutexAddr, FUTEX_WAIT_PRIVATE, old - 1, NULL);
}
+ int policy = sched_getscheduler(0);
+ if (!(policy == SCHED_FIFO || policy == SCHED_RR)) {
+ ALOGE("did not receive expected priority boost");
+ }
// This may be overly conservative; there could be times that the normal mixer
// requests such a brief cold idle that it doesn't require resetting this flag.
isWarm = false;
diff --git a/services/audioflinger/ISchedulingPolicyService.cpp b/services/audioflinger/ISchedulingPolicyService.cpp
index 218aa6b..0079968 100644
--- a/services/audioflinger/ISchedulingPolicyService.cpp
+++ b/services/audioflinger/ISchedulingPolicyService.cpp
@@ -37,14 +37,15 @@
{
}
- virtual int requestPriority(int32_t pid, int32_t tid, int32_t prio)
+ virtual int requestPriority(int32_t pid, int32_t tid, int32_t prio, bool asynchronous)
{
Parcel data, reply;
data.writeInterfaceToken(ISchedulingPolicyService::getInterfaceDescriptor());
data.writeInt32(pid);
data.writeInt32(tid);
data.writeInt32(prio);
- remote()->transact(REQUEST_PRIORITY_TRANSACTION, data, &reply, IBinder::FLAG_ONEWAY);
+ uint32_t flags = asynchronous ? IBinder::FLAG_ONEWAY : 0;
+ remote()->transact(REQUEST_PRIORITY_TRANSACTION, data, &reply, flags);
// fail on exception
if (reply.readExceptionCode() != 0) return -1;
return reply.readInt32();
diff --git a/services/audioflinger/ISchedulingPolicyService.h b/services/audioflinger/ISchedulingPolicyService.h
index a38e67e..b94b191 100644
--- a/services/audioflinger/ISchedulingPolicyService.h
+++ b/services/audioflinger/ISchedulingPolicyService.h
@@ -27,7 +27,7 @@
DECLARE_META_INTERFACE(SchedulingPolicyService);
virtual int requestPriority(/*pid_t*/int32_t pid, /*pid_t*/int32_t tid,
- int32_t prio) = 0;
+ int32_t prio, bool asynchronous) = 0;
};
diff --git a/services/audioflinger/SchedulingPolicyService.cpp b/services/audioflinger/SchedulingPolicyService.cpp
index 59cc99a..36e62e9 100644
--- a/services/audioflinger/SchedulingPolicyService.cpp
+++ b/services/audioflinger/SchedulingPolicyService.cpp
@@ -25,7 +25,7 @@
static const String16 _scheduling_policy("scheduling_policy");
static Mutex sMutex;
-int requestPriority(pid_t pid, pid_t tid, int32_t prio)
+int requestPriority(pid_t pid, pid_t tid, int32_t prio, bool asynchronous)
{
// FIXME merge duplicated code related to service lookup, caching, and error recovery
sp<ISchedulingPolicyService> sps;
@@ -46,7 +46,7 @@
}
sleep(1);
}
- return sps->requestPriority(pid, tid, prio);
+ return sps->requestPriority(pid, tid, prio, asynchronous);
}
} // namespace android
diff --git a/services/audioflinger/SchedulingPolicyService.h b/services/audioflinger/SchedulingPolicyService.h
index 7ac8454..a9870d4 100644
--- a/services/audioflinger/SchedulingPolicyService.h
+++ b/services/audioflinger/SchedulingPolicyService.h
@@ -21,7 +21,10 @@
// Request elevated priority for thread tid, whose thread group leader must be pid.
// The priority parameter is currently restricted to either 1 or 2.
-int requestPriority(pid_t pid, pid_t tid, int32_t prio);
+// 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.
+int requestPriority(pid_t pid, pid_t tid, int32_t prio, bool asynchronous = false);
} // namespace android
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 47ca100..539bb4f 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -373,7 +373,9 @@
switch(event->type()) {
case CFG_EVENT_PRIO: {
PrioConfigEvent *prioEvent = static_cast<PrioConfigEvent *>(event);
- int err = requestPriority(prioEvent->pid(), prioEvent->tid(), prioEvent->prio());
+ // FIXME Need to understand why this has be done asynchronously
+ int err = requestPriority(prioEvent->pid(), prioEvent->tid(), prioEvent->prio(),
+ true /*asynchronous*/);
if (err != 0) {
ALOGW("Policy SCHED_FIFO priority %d is unavailable for pid %d tid %d; "
"error %d",