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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "Latency.h"
#include "nsThreadUtils.h"
#include "mozilla/Logging.h"
#include <cmath>
#include <algorithm>
#include <mozilla/Services.h>
#include <mozilla/StaticPtr.h>
#include "nsContentUtils.h"
using namespace mozilla;
const char* LatencyLogIndex2Strings[] = {
"Audio MediaStreamTrack",
"Video MediaStreamTrack",
"Cubeb",
"AudioStream",
"NetEQ",
"AudioCapture Base",
"AudioCapture Samples",
"AudioTrackInsertion",
"MediaPipeline Audio Insertion",
"AudioTransmit",
"AudioReceive",
"MediaPipelineAudioPlayout",
"MediaStream Create",
"AudioStream Create",
"AudioSendRTP",
"AudioRecvRTP"
};
static StaticRefPtr<AsyncLatencyLogger> gAsyncLogger;
LogModule*
GetLatencyLog()
{
static LazyLogModule sLog("MediaLatency");
return sLog;
}
class LogEvent : public Runnable
{
public:
LogEvent(AsyncLatencyLogger::LatencyLogIndex aIndex, uint64_t aID, int64_t aValue,
TimeStamp aTimeStamp) :
mIndex(aIndex),
mID(aID),
mValue(aValue),
mTimeStamp(aTimeStamp)
{}
LogEvent(AsyncLatencyLogger::LatencyLogIndex aIndex, uint64_t aID, int64_t aValue) :
mIndex(aIndex),
mID(aID),
mValue(aValue),
mTimeStamp(TimeStamp())
{}
~LogEvent() {}
NS_IMETHOD Run() override {
AsyncLatencyLogger::Get(true)->WriteLog(mIndex, mID, mValue, mTimeStamp);
return NS_OK;
}
protected:
AsyncLatencyLogger::LatencyLogIndex mIndex;
uint64_t mID;
int64_t mValue;
TimeStamp mTimeStamp;
};
void LogLatency(AsyncLatencyLogger::LatencyLogIndex aIndex, uint64_t aID, int64_t aValue)
{
AsyncLatencyLogger::Get()->Log(aIndex, aID, aValue);
}
void LogTime(AsyncLatencyLogger::LatencyLogIndex aIndex, uint64_t aID, int64_t aValue)
{
TimeStamp now = TimeStamp::Now();
AsyncLatencyLogger::Get()->Log(aIndex, aID, aValue, now);
}
void LogTime(AsyncLatencyLogger::LatencyLogIndex aIndex, uint64_t aID, int64_t aValue, TimeStamp &aTime)
{
AsyncLatencyLogger::Get()->Log(aIndex, aID, aValue, aTime);
}
void LogTime(uint32_t aIndex, uint64_t aID, int64_t aValue)
{
LogTime(static_cast<AsyncLatencyLogger::LatencyLogIndex>(aIndex), aID, aValue);
}
void LogTime(uint32_t aIndex, uint64_t aID, int64_t aValue, TimeStamp &aTime)
{
LogTime(static_cast<AsyncLatencyLogger::LatencyLogIndex>(aIndex), aID, aValue, aTime);
}
void LogLatency(uint32_t aIndex, uint64_t aID, int64_t aValue)
{
LogLatency(static_cast<AsyncLatencyLogger::LatencyLogIndex>(aIndex), aID, aValue);
}
/* static */
void AsyncLatencyLogger::InitializeStatics()
{
NS_ASSERTION(NS_IsMainThread(), "Main thread only");
//Make sure that the underlying logger is allocated.
GetLatencyLog();
gAsyncLogger = new AsyncLatencyLogger();
}
/* static */
void AsyncLatencyLogger::ShutdownLogger()
{
gAsyncLogger = nullptr;
}
/* static */
AsyncLatencyLogger* AsyncLatencyLogger::Get(bool aStartTimer)
{
// Users don't generally null-check the result since we should live longer than they
MOZ_ASSERT(gAsyncLogger);
if (aStartTimer) {
gAsyncLogger->Init();
}
return gAsyncLogger;
}
NS_IMPL_ISUPPORTS(AsyncLatencyLogger, nsIObserver)
AsyncLatencyLogger::AsyncLatencyLogger()
: mThread(nullptr),
mMutex("AsyncLatencyLogger")
{
NS_ASSERTION(NS_IsMainThread(), "Main thread only");
nsContentUtils::RegisterShutdownObserver(this);
}
AsyncLatencyLogger::~AsyncLatencyLogger()
{
AsyncLatencyLogger::Shutdown();
}
void AsyncLatencyLogger::Shutdown()
{
nsContentUtils::UnregisterShutdownObserver(this);
MutexAutoLock lock(mMutex);
if (mThread) {
mThread->Shutdown();
}
mStart = TimeStamp(); // make sure we don't try to restart it for any reason
}
void AsyncLatencyLogger::Init()
{
MutexAutoLock lock(mMutex);
if (mStart.IsNull()) {
nsresult rv = NS_NewNamedThread("Latency Logger", getter_AddRefs(mThread));
NS_ENSURE_SUCCESS_VOID(rv);
mStart = TimeStamp::Now();
}
}
void AsyncLatencyLogger::GetStartTime(TimeStamp &aStart)
{
MutexAutoLock lock(mMutex);
aStart = mStart;
}
nsresult
AsyncLatencyLogger::Observe(nsISupports* aSubject, const char* aTopic,
const char16_t* aData)
{
MOZ_ASSERT(NS_IsMainThread());
if (strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
Shutdown();
}
return NS_OK;
}
// aID is a sub-identifier (in particular a specific MediaStramTrack)
void AsyncLatencyLogger::WriteLog(LatencyLogIndex aIndex, uint64_t aID, int64_t aValue,
TimeStamp aTimeStamp)
{
if (aTimeStamp.IsNull()) {
MOZ_LOG(GetLatencyLog(), LogLevel::Debug,
("Latency: %s,%llu,%lld,%lld",
LatencyLogIndex2Strings[aIndex], aID, GetTimeStamp(), aValue));
} else {
MOZ_LOG(GetLatencyLog(), LogLevel::Debug,
("Latency: %s,%llu,%lld,%lld,%lld",
LatencyLogIndex2Strings[aIndex], aID, GetTimeStamp(), aValue,
static_cast<int64_t>((aTimeStamp - gAsyncLogger->mStart).ToMilliseconds())));
}
}
int64_t AsyncLatencyLogger::GetTimeStamp()
{
TimeDuration t = TimeStamp::Now() - mStart;
return t.ToMilliseconds();
}
void AsyncLatencyLogger::Log(LatencyLogIndex aIndex, uint64_t aID, int64_t aValue)
{
TimeStamp null;
Log(aIndex, aID, aValue, null);
}
void AsyncLatencyLogger::Log(LatencyLogIndex aIndex, uint64_t aID, int64_t aValue, TimeStamp &aTime)
{
if (MOZ_LOG_TEST(GetLatencyLog(), LogLevel::Debug)) {
nsCOMPtr<nsIRunnable> event = new LogEvent(aIndex, aID, aValue, aTime);
if (mThread) {
mThread->Dispatch(event, NS_DISPATCH_NORMAL);
}
}
}
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