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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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,
#include "GraphDriver.h"
#include "AudioNodeEngine.h"
#include "cubeb/cubeb.h"
#include "mozilla/dom/AudioContext.h"
#include "mozilla/dom/AudioDeviceInfo.h"
#include "mozilla/dom/BaseAudioContextBinding.h"
#include "mozilla/SchedulerGroup.h"
#include "mozilla/SharedThreadPool.h"
#include "mozilla/ClearOnShutdown.h"
#include "mozilla/Unused.h"
#include "mozilla/MathAlgorithms.h"
#include "mozilla/StaticPrefs_media.h"
#include "CubebDeviceEnumerator.h"
#include "MediaTrackGraphImpl.h"
#include "CallbackThreadRegistry.h"
#include "Tracing.h"
#ifdef MOZ_WEBRTC
# include "webrtc/MediaEngineWebRTC.h"
#endif
#ifdef XP_MACOSX
# include <sys/sysctl.h>
# include "nsCocoaFeatures.h"
#endif
extern mozilla::LazyLogModule gMediaTrackGraphLog;
#ifdef LOG
# undef LOG
#endif // LOG
#define LOG(type, msg) MOZ_LOG(gMediaTrackGraphLog, type, msg)
namespace mozilla {
GraphDriver::GraphDriver(GraphInterface* aGraphInterface,
GraphDriver* aPreviousDriver, uint32_t aSampleRate)
: mGraphInterface(aGraphInterface),
mSampleRate(aSampleRate),
mPreviousDriver(aPreviousDriver) {}
void GraphDriver::SetStreamName(const nsACString& aStreamName) {
MOZ_ASSERT(InIteration() || (!ThreadRunning() && NS_IsMainThread()));
mStreamName = aStreamName;
LOG(LogLevel::Debug, ("%p: GraphDriver::SetStreamName driver=%p %s", Graph(),
this, mStreamName.get()));
}
void GraphDriver::SetState(const nsACString& aStreamName,
GraphTime aIterationEnd,
GraphTime aStateComputedTime) {
MOZ_ASSERT(InIteration() || !ThreadRunning());
mStreamName = aStreamName;
mIterationEnd = aIterationEnd;
mStateComputedTime = aStateComputedTime;
}
#ifdef DEBUG
bool GraphDriver::InIteration() const {
return OnThread() || Graph()->InDriverIteration(this);
}
#endif
GraphDriver* GraphDriver::PreviousDriver() {
MOZ_ASSERT(InIteration() || !ThreadRunning());
return mPreviousDriver;
}
void GraphDriver::SetPreviousDriver(GraphDriver* aPreviousDriver) {
MOZ_ASSERT(InIteration() || !ThreadRunning());
mPreviousDriver = aPreviousDriver;
}
ThreadedDriver::ThreadedDriver(GraphInterface* aGraphInterface,
GraphDriver* aPreviousDriver,
uint32_t aSampleRate)
: GraphDriver(aGraphInterface, aPreviousDriver, aSampleRate),
mThreadRunning(false) {}
class MediaTrackGraphShutdownThreadRunnable : public Runnable {
public:
explicit MediaTrackGraphShutdownThreadRunnable(
already_AddRefed<nsIThread> aThread)
: Runnable("MediaTrackGraphShutdownThreadRunnable"), mThread(aThread) {}
NS_IMETHOD Run() override {
TRACE("MediaTrackGraphShutdownThreadRunnable");
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mThread);
mThread->AsyncShutdown();
mThread = nullptr;
return NS_OK;
}
private:
nsCOMPtr<nsIThread> mThread;
};
ThreadedDriver::~ThreadedDriver() {
if (mThread) {
nsCOMPtr<nsIRunnable> event =
new MediaTrackGraphShutdownThreadRunnable(mThread.forget());
SchedulerGroup::Dispatch(event.forget());
}
}
class MediaTrackGraphInitThreadRunnable : public Runnable {
public:
explicit MediaTrackGraphInitThreadRunnable(ThreadedDriver* aDriver)
: Runnable("MediaTrackGraphInitThreadRunnable"), mDriver(aDriver) {}
NS_IMETHOD Run() override {
TRACE("MediaTrackGraphInitThreadRunnable");
MOZ_ASSERT(!mDriver->ThreadRunning());
LOG(LogLevel::Debug, ("Starting a new system driver for graph %p",
mDriver->mGraphInterface.get()));
if (GraphDriver* previousDriver = mDriver->PreviousDriver()) {
LOG(LogLevel::Debug,
("%p releasing an AudioCallbackDriver(%p), for graph %p",
mDriver.get(), previousDriver, mDriver->Graph()));
MOZ_ASSERT(!mDriver->AsAudioCallbackDriver());
AudioCallbackDriver* audioCallbackDriver =
previousDriver->AsAudioCallbackDriver();
MOZ_ALWAYS_SUCCEEDS(audioCallbackDriver->mCubebOperationThread->Dispatch(
NS_NewRunnableFunction(
"ThreadedDriver previousDriver::Stop()",
[audioCallbackDriver = RefPtr{audioCallbackDriver}] {
audioCallbackDriver->Stop();
})));
mDriver->SetPreviousDriver(nullptr);
}
mDriver->RunThread();
return NS_OK;
}
private:
RefPtr<ThreadedDriver> mDriver;
};
void ThreadedDriver::Start() {
MOZ_ASSERT(!ThreadRunning());
LOG(LogLevel::Debug,
("Starting thread for a SystemClockDriver %p", mGraphInterface.get()));
Unused << NS_WARN_IF(mThread);
MOZ_ASSERT(!mThread); // Ensure we haven't already started it
nsCOMPtr<nsIRunnable> event = new MediaTrackGraphInitThreadRunnable(this);
// Note: mThread may be null during event->Run() if we pass to NewNamedThread!
// See AudioInitTask
nsresult rv = NS_NewNamedThread("MediaTrackGrph", getter_AddRefs(mThread));
if (NS_SUCCEEDED(rv)) {
mThread->Dispatch(event.forget(), NS_DISPATCH_NORMAL);
}
}
void ThreadedDriver::Shutdown() {
NS_ASSERTION(NS_IsMainThread(), "Must be called on main thread");
// mGraph's thread is not running so it's OK to do whatever here
LOG(LogLevel::Debug, ("Stopping threads for MediaTrackGraph %p", this));
if (mThread) {
LOG(LogLevel::Debug,
("%p: Stopping ThreadedDriver's %p thread", Graph(), this));
mThread->AsyncShutdown();
mThread = nullptr;
}
}
SystemClockDriver::SystemClockDriver(GraphInterface* aGraphInterface,
GraphDriver* aPreviousDriver,
uint32_t aSampleRate)
: ThreadedDriver(aGraphInterface, aPreviousDriver, aSampleRate),
mInitialTimeStamp(TimeStamp::Now()),
mCurrentTimeStamp(TimeStamp::Now()),
mLastTimeStamp(TimeStamp::Now()) {}
SystemClockDriver::~SystemClockDriver() = default;
void ThreadedDriver::RunThread() {
mThreadRunning = true;
while (true) {
auto iterationStart = mIterationEnd;
mIterationEnd += GetIntervalForIteration();
if (mStateComputedTime < mIterationEnd) {
LOG(LogLevel::Warning, ("%p: Global underrun detected", Graph()));
mIterationEnd = mStateComputedTime;
}
if (iterationStart >= mIterationEnd) {
NS_ASSERTION(iterationStart == mIterationEnd, "Time can't go backwards!");
// This could happen due to low clock resolution, maybe?
LOG(LogLevel::Debug, ("%p: Time did not advance", Graph()));
}
GraphTime nextStateComputedTime =
MediaTrackGraphImpl::RoundUpToEndOfAudioBlock(
mIterationEnd + MillisecondsToMediaTime(AUDIO_TARGET_MS));
if (nextStateComputedTime < mStateComputedTime) {
// A previous driver may have been processing further ahead of
// iterationEnd.
LOG(LogLevel::Warning,
("%p: Prevent state from going backwards. interval[%ld; %ld] "
"state[%ld; "
"%ld]",
Graph(), (long)iterationStart, (long)mIterationEnd,
(long)mStateComputedTime, (long)nextStateComputedTime));
nextStateComputedTime = mStateComputedTime;
}
LOG(LogLevel::Verbose,
("%p: interval[%ld; %ld] state[%ld; %ld]", Graph(),
(long)iterationStart, (long)mIterationEnd, (long)mStateComputedTime,
(long)nextStateComputedTime));
mStateComputedTime = nextStateComputedTime;
IterationResult result =
Graph()->OneIteration(mStateComputedTime, mIterationEnd, nullptr);
if (result.IsStop()) {
// Signal that we're done stopping.
result.Stopped();
break;
}
WaitForNextIteration();
if (GraphDriver* nextDriver = result.NextDriver()) {
LOG(LogLevel::Debug, ("%p: Switching to AudioCallbackDriver", Graph()));
result.Switched();
nextDriver->SetState(mStreamName, mIterationEnd, mStateComputedTime);
nextDriver->Start();
break;
}
MOZ_ASSERT(result.IsStillProcessing());
}
mThreadRunning = false;
}
MediaTime SystemClockDriver::GetIntervalForIteration() {
TimeStamp now = TimeStamp::Now();
MediaTime interval =
SecondsToMediaTime((now - mCurrentTimeStamp).ToSeconds());
mCurrentTimeStamp = now;
MOZ_LOG(gMediaTrackGraphLog, LogLevel::Verbose,
("%p: Updating current time to %f (real %f, StateComputedTime() %f)",
Graph(), MediaTimeToSeconds(mIterationEnd + interval),
(now - mInitialTimeStamp).ToSeconds(),
MediaTimeToSeconds(mStateComputedTime)));
return interval;
}
void ThreadedDriver::EnsureNextIteration() {
mWaitHelper.EnsureNextIteration();
}
void ThreadedDriver::WaitForNextIteration() {
MOZ_ASSERT(mThread);
MOZ_ASSERT(OnThread());
mWaitHelper.WaitForNextIterationAtLeast(WaitInterval());
}
TimeDuration SystemClockDriver::WaitInterval() {
MOZ_ASSERT(mThread);
MOZ_ASSERT(OnThread());
TimeStamp now = TimeStamp::Now();
int64_t timeoutMS = MEDIA_GRAPH_TARGET_PERIOD_MS -
int64_t((now - mCurrentTimeStamp).ToMilliseconds());
// Make sure timeoutMS doesn't overflow 32 bits by waking up at
// least once a minute, if we need to wake up at all
timeoutMS = std::max<int64_t>(0, std::min<int64_t>(timeoutMS, 60 * 1000));
LOG(LogLevel::Verbose,
("%p: Waiting for next iteration; at %f, timeout=%f", Graph(),
(now - mInitialTimeStamp).ToSeconds(), timeoutMS / 1000.0));
return TimeDuration::FromMilliseconds(timeoutMS);
}
OfflineClockDriver::OfflineClockDriver(GraphInterface* aGraphInterface,
uint32_t aSampleRate, GraphTime aSlice)
: ThreadedDriver(aGraphInterface, nullptr, aSampleRate), mSlice(aSlice) {}
OfflineClockDriver::~OfflineClockDriver() = default;
void OfflineClockDriver::RunThread() {
nsCOMPtr<nsIThreadInternal> threadInternal = do_QueryInterface(mThread);
nsCOMPtr<nsIThreadObserver> observer = do_QueryInterface(Graph());
threadInternal->SetObserver(observer);
ThreadedDriver::RunThread();
}
MediaTime OfflineClockDriver::GetIntervalForIteration() {
return MillisecondsToMediaTime(mSlice);
}
/* Helper to proxy the GraphInterface methods used by a running
* mFallbackDriver. */
class AudioCallbackDriver::FallbackWrapper : public GraphInterface {
public:
FallbackWrapper(RefPtr<GraphInterface> aGraph,
RefPtr<AudioCallbackDriver> aOwner, uint32_t aSampleRate,
const nsACString& aStreamName, GraphTime aIterationEnd,
GraphTime aStateComputedTime)
: mGraph(std::move(aGraph)),
mOwner(std::move(aOwner)),
mFallbackDriver(
MakeRefPtr<SystemClockDriver>(this, nullptr, aSampleRate)) {
mFallbackDriver->SetState(aStreamName, aIterationEnd, aStateComputedTime);
}
NS_DECL_THREADSAFE_ISUPPORTS
/* Proxied SystemClockDriver methods */
void Start() { mFallbackDriver->Start(); }
MOZ_CAN_RUN_SCRIPT void Shutdown() {
RefPtr<SystemClockDriver> driver = mFallbackDriver;
driver->Shutdown();
}
void SetStreamName(const nsACString& aStreamName) {
mFallbackDriver->SetStreamName(aStreamName);
}
void EnsureNextIteration() { mFallbackDriver->EnsureNextIteration(); }
#ifdef DEBUG
bool InIteration() { return mFallbackDriver->InIteration(); }
#endif
bool OnThread() { return mFallbackDriver->OnThread(); }
/* GraphInterface methods */
void NotifyInputStopped() override {
MOZ_CRASH("Unexpected NotifyInputStopped from fallback SystemClockDriver");
}
void NotifyInputData(const AudioDataValue* aBuffer, size_t aFrames,
TrackRate aRate, uint32_t aChannels,
uint32_t aAlreadyBuffered) override {
MOZ_CRASH("Unexpected NotifyInputData from fallback SystemClockDriver");
}
void DeviceChanged() override {
MOZ_CRASH("Unexpected DeviceChanged from fallback SystemClockDriver");
}
#ifdef DEBUG
bool InDriverIteration(const GraphDriver* aDriver) const override {
return mGraph->InDriverIteration(mOwner) && mOwner->OnFallback();
}
#endif
IterationResult OneIteration(GraphTime aStateComputedEnd,
GraphTime aIterationEnd,
MixerCallbackReceiver* aMixerReceiver) override {
MOZ_ASSERT(!aMixerReceiver);
#ifdef DEBUG
AutoInCallback aic(mOwner);
#endif
IterationResult result =
mGraph->OneIteration(aStateComputedEnd, aIterationEnd, aMixerReceiver);
AudioStreamState audioState = mOwner->mAudioStreamState;
MOZ_ASSERT(audioState != AudioStreamState::Stopping,
"The audio driver can only enter stopping if it iterated the "
"graph, which it can only do if there's no fallback driver");
// After a devicechange event from the audio driver, wait for a five
// millisecond grace period before handing control to the audio driver. We
// do this because cubeb leaves no guarantee on audio callbacks coming in
// after a device change event.
if (audioState == AudioStreamState::ChangingDevice &&
mOwner->mChangingDeviceStartTime + TimeDuration::FromMilliseconds(5) <
TimeStamp::Now()) {
mOwner->mChangingDeviceStartTime = TimeStamp();
if (mOwner->mAudioStreamState.compareExchange(
AudioStreamState::ChangingDevice, AudioStreamState::Starting)) {
audioState = AudioStreamState::Starting;
LOG(LogLevel::Debug, ("%p: Fallback driver has started. Waiting for "
"audio driver to start.",
mOwner.get()));
}
}
if (audioState != AudioStreamState::Running && result.IsStillProcessing()) {
mOwner->MaybeStartAudioStream();
return result;
}
MOZ_ASSERT(result.IsStillProcessing() || result.IsStop() ||
result.IsSwitchDriver());
// Proxy the release of the fallback driver to a background thread, so it
// doesn't perform unexpected suicide.
IterationResult stopFallback =
IterationResult::CreateStop(NS_NewRunnableFunction(
"AudioCallbackDriver::FallbackDriverStopped",
[self = RefPtr<FallbackWrapper>(this), this, aIterationEnd,
aStateComputedEnd, result = std::move(result)]() mutable {
FallbackDriverState fallbackState =
result.IsStillProcessing() ? FallbackDriverState::None
: FallbackDriverState::Stopped;
mOwner->FallbackDriverStopped(aIterationEnd, aStateComputedEnd,
fallbackState);
if (fallbackState == FallbackDriverState::Stopped) {
#ifdef DEBUG
// The AudioCallbackDriver may not iterate the graph, but we'll
// call into it so we need to be regarded as "in iteration".
AutoInCallback aic(mOwner);
#endif
if (GraphDriver* nextDriver = result.NextDriver()) {
LOG(LogLevel::Debug,
("%p: Switching from fallback to other driver.",
mOwner.get()));
result.Switched();
nextDriver->SetState(mOwner->mStreamName, aIterationEnd,
aStateComputedEnd);
nextDriver->Start();
} else if (result.IsStop()) {
LOG(LogLevel::Debug,
("%p: Stopping fallback driver.", mOwner.get()));
result.Stopped();
}
}
mOwner = nullptr;
NS_DispatchBackgroundTask(NS_NewRunnableFunction(
"AudioCallbackDriver::FallbackDriverStopped::Release",
[fallback = std::move(self->mFallbackDriver)] {}));
}));
return stopFallback;
}
private:
virtual ~FallbackWrapper() = default;
const RefPtr<GraphInterface> mGraph;
// Valid until mFallbackDriver has finished its last iteration.
RefPtr<AudioCallbackDriver> mOwner;
RefPtr<SystemClockDriver> mFallbackDriver;
};
NS_IMPL_ISUPPORTS0(AudioCallbackDriver::FallbackWrapper)
/* static */
already_AddRefed<TaskQueue> AudioCallbackDriver::CreateTaskQueue() {
return TaskQueue::Create(CubebUtils::GetCubebOperationThread(),
"AudioCallbackDriver cubeb task queue")
.forget();
}
AudioCallbackDriver::AudioCallbackDriver(
GraphInterface* aGraphInterface, GraphDriver* aPreviousDriver,
uint32_t aSampleRate, uint32_t aOutputChannelCount,
uint32_t aInputChannelCount, CubebUtils::AudioDeviceID aOutputDeviceID,
CubebUtils::AudioDeviceID aInputDeviceID, AudioInputType aAudioInputType)
: GraphDriver(aGraphInterface, aPreviousDriver, aSampleRate),
mOutputChannelCount(aOutputChannelCount),
mInputChannelCount(aInputChannelCount),
mOutputDeviceID(aOutputDeviceID),
mInputDeviceID(aInputDeviceID),
mIterationDurationMS(MEDIA_GRAPH_TARGET_PERIOD_MS),
mCubebOperationThread(CreateTaskQueue()),
mAudioThreadId(ProfilerThreadId{}),
mAudioThreadIdInCb(std::thread::id()),
mFallback("AudioCallbackDriver::mFallback"),
mSandboxed(CubebUtils::SandboxEnabled()) {
LOG(LogLevel::Debug, ("%p: AudioCallbackDriver %p ctor - input: device %p, "
"channel %d, output: device %p, channel %d",
Graph(), this, mInputDeviceID, mInputChannelCount,
mOutputDeviceID, mOutputChannelCount));
NS_WARNING_ASSERTION(mOutputChannelCount != 0,
"Invalid output channel count");
MOZ_ASSERT(mOutputChannelCount <= 8);
bool allowVoice = StaticPrefs::
media_getusermedia_microphone_prefer_voice_stream_with_processing_enabled();
#ifdef MOZ_WIDGET_COCOA
// Using the VoiceProcessingIO audio unit on MacOS 12 causes crashes in
// OS code.
allowVoice = allowVoice && nsCocoaFeatures::macOSVersionMajor() != 12;
#endif
if (aAudioInputType == AudioInputType::Voice && allowVoice) {
LOG(LogLevel::Debug, ("VOICE."));
mInputDevicePreference = CUBEB_DEVICE_PREF_VOICE;
CubebUtils::SetInCommunication(true);
} else {
mInputDevicePreference = CUBEB_DEVICE_PREF_ALL;
}
}
AudioCallbackDriver::~AudioCallbackDriver() {
if (mInputDevicePreference == CUBEB_DEVICE_PREF_VOICE) {
CubebUtils::SetInCommunication(false);
}
}
bool IsMacbookOrMacbookAir() {
#ifdef XP_MACOSX
size_t len = 0;
sysctlbyname("hw.model", NULL, &len, NULL, 0);
if (len) {
UniquePtr<char[]> model(new char[len]);
// This string can be
// MacBook%d,%d for a normal MacBook
// MacBookAir%d,%d for a Macbook Air
sysctlbyname("hw.model", model.get(), &len, NULL, 0);
char* substring = strstr(model.get(), "MacBook");
if (substring) {
const size_t offset = strlen("MacBook");
if (!strncmp(model.get() + offset, "Air", 3) ||
isdigit(model[offset + 1])) {
return true;
}
}
}
#endif
return false;
}
void AudioCallbackDriver::Init(const nsCString& aStreamName) {
LOG(LogLevel::Debug,
("%p: AudioCallbackDriver::Init driver=%p", Graph(), this));
TRACE("AudioCallbackDriver::Init");
MOZ_ASSERT(OnCubebOperationThread());
MOZ_ASSERT(mAudioStreamState == AudioStreamState::Pending);
if (mFallbackDriverState == FallbackDriverState::Stopped) {
// The graph has already stopped us.
return;
}
RefPtr<CubebUtils::CubebHandle> handle = CubebUtils::GetCubeb();
if (!handle) {
NS_WARNING("Could not get cubeb context.");
LOG(LogLevel::Warning, ("%s: Could not get cubeb context", __func__));
mAudioStreamState = AudioStreamState::None;
if (TryStartingFallbackDriver().isOk()) {
CubebUtils::ReportCubebStreamInitFailure(true);
}
return;
}
cubeb_stream_params output;
cubeb_stream_params input;
bool firstStream = CubebUtils::GetFirstStream();
MOZ_ASSERT(!NS_IsMainThread(),
"This is blocking and should never run on the main thread.");
output.rate = mSampleRate;
output.format = CUBEB_SAMPLE_FLOAT32NE;
if (!mOutputChannelCount) {
LOG(LogLevel::Warning, ("Output number of channels is 0."));
mAudioStreamState = AudioStreamState::None;
if (TryStartingFallbackDriver().isOk()) {
CubebUtils::ReportCubebStreamInitFailure(firstStream);
}
return;
}
CubebUtils::AudioDeviceID forcedOutputDeviceId = nullptr;
char* forcedOutputDeviceName = CubebUtils::GetForcedOutputDevice();
if (forcedOutputDeviceName) {
RefPtr<CubebDeviceEnumerator> enumerator = Enumerator::GetInstance();
RefPtr<AudioDeviceInfo> device = enumerator->DeviceInfoFromName(
NS_ConvertUTF8toUTF16(forcedOutputDeviceName), EnumeratorSide::OUTPUT);
if (device && device->DeviceID()) {
forcedOutputDeviceId = device->DeviceID();
}
}
mBuffer = AudioCallbackBufferWrapper<AudioDataValue>(mOutputChannelCount);
mScratchBuffer =
SpillBuffer<AudioDataValue, WEBAUDIO_BLOCK_SIZE * 2>(mOutputChannelCount);
output.channels = mOutputChannelCount;
AudioConfig::ChannelLayout::ChannelMap channelMap =
AudioConfig::ChannelLayout(mOutputChannelCount).Map();
output.layout = static_cast<uint32_t>(channelMap);
output.prefs = CubebUtils::GetDefaultStreamPrefs(CUBEB_DEVICE_TYPE_OUTPUT);
if (mInputDevicePreference == CUBEB_DEVICE_PREF_VOICE &&
CubebUtils::RouteOutputAsVoice()) {
output.prefs |= static_cast<cubeb_stream_prefs>(CUBEB_STREAM_PREF_VOICE);
}
uint32_t latencyFrames = CubebUtils::GetCubebMTGLatencyInFrames(&output);
LOG(LogLevel::Debug, ("Minimum latency in frames: %d", latencyFrames));
// Macbook and MacBook air don't have enough CPU to run very low latency
// MediaTrackGraphs, cap the minimal latency to 512 frames int this case.
if (IsMacbookOrMacbookAir()) {
latencyFrames = std::max((uint32_t)512, latencyFrames);
LOG(LogLevel::Debug,
("Macbook or macbook air, new latency: %d", latencyFrames));
}
// Buffer sizes lower than 10ms are nowadays common. It's not very useful
// when doing voice, because all the WebRTC code that does audio input
// processing deals in 10ms chunks of audio. Take the first power of two
// above 10ms at the current rate in this case. It's probably 512, for common
// rates.
if (mInputDevicePreference == CUBEB_DEVICE_PREF_VOICE) {
if (latencyFrames < mSampleRate / 100) {
latencyFrames = mozilla::RoundUpPow2(mSampleRate / 100);
LOG(LogLevel::Debug,
("AudioProcessing enabled, new latency %d", latencyFrames));
}
}
// It's not useful for the graph to run with a block size lower than the Web
// Audio API block size, but increasingly devices report that they can do
// audio latencies lower than that.
if (latencyFrames < WEBAUDIO_BLOCK_SIZE) {
LOG(LogLevel::Debug,
("Latency clamped to %d from %d", WEBAUDIO_BLOCK_SIZE, latencyFrames));
latencyFrames = WEBAUDIO_BLOCK_SIZE;
}
LOG(LogLevel::Debug, ("Effective latency in frames: %d", latencyFrames));
input = output;
input.channels = mInputChannelCount;
input.layout = CUBEB_LAYOUT_UNDEFINED;
input.prefs = CubebUtils::GetDefaultStreamPrefs(CUBEB_DEVICE_TYPE_INPUT);
if (mInputDevicePreference == CUBEB_DEVICE_PREF_VOICE) {
input.prefs |= static_cast<cubeb_stream_prefs>(CUBEB_STREAM_PREF_VOICE);
}
cubeb_stream* stream = nullptr;
const char* streamName =
aStreamName.IsEmpty() ? "AudioCallbackDriver" : aStreamName.get();
bool inputWanted = mInputChannelCount > 0;
CubebUtils::AudioDeviceID outputId = mOutputDeviceID;
CubebUtils::AudioDeviceID inputId = mInputDeviceID;
if (CubebUtils::CubebStreamInit(
handle->Context(), &stream, streamName, inputId,
inputWanted ? &input : nullptr,
forcedOutputDeviceId ? forcedOutputDeviceId : outputId, &output,
latencyFrames, DataCallback_s, StateCallback_s, this) == CUBEB_OK) {
mCubeb = handle;
mAudioStream.own(stream);
DebugOnly<int> rv =
cubeb_stream_set_volume(mAudioStream, CubebUtils::GetVolumeScale());
NS_WARNING_ASSERTION(
rv == CUBEB_OK,
"Could not set the audio stream volume in GraphDriver.cpp");
CubebUtils::ReportCubebBackendUsed();
} else {
NS_WARNING(
"Could not create a cubeb stream for MediaTrackGraph, falling "
"back to a SystemClockDriver");
mAudioStreamState = AudioStreamState::None;
// Only report failures when we're not coming from a driver that was
// created itself as a fallback driver because of a previous audio driver
// failure.
if (TryStartingFallbackDriver().isOk()) {
CubebUtils::ReportCubebStreamInitFailure(firstStream);
}
return;
}
#ifdef XP_MACOSX
PanOutputIfNeeded(inputWanted);
#endif
cubeb_stream_register_device_changed_callback(
mAudioStream, AudioCallbackDriver::DeviceChangedCallback_s);
// No-op if MOZ_DUMP_AUDIO is not defined as an environment variable. This
// is intended for diagnosing issues, and only works if the content sandbox is
// disabled.
mInputStreamFile.Open("GraphDriverInput", input.channels, input.rate);
mOutputStreamFile.Open("GraphDriverOutput", output.channels, output.rate);
if (NS_WARN_IF(!StartStream())) {
LOG(LogLevel::Warning,
("%p: AudioCallbackDriver couldn't start a cubeb stream.", Graph()));
return;
}
LOG(LogLevel::Debug, ("%p: AudioCallbackDriver started.", Graph()));
}
void AudioCallbackDriver::SetCubebStreamName(const nsCString& aStreamName) {
MOZ_ASSERT(OnCubebOperationThread());
MOZ_ASSERT(mAudioStream);
cubeb_stream_set_name(mAudioStream, aStreamName.get());
}
void AudioCallbackDriver::Start() {
MOZ_ASSERT(!IsStarted());
MOZ_ASSERT(mAudioStreamState == AudioStreamState::None);
MOZ_ASSERT_IF(PreviousDriver(), PreviousDriver()->InIteration());
mAudioStreamState = AudioStreamState::Pending;
// Starting an audio driver could take a while. We start a system driver in
// the meantime so that the graph is kept running.
(void)TryStartingFallbackDriver();
if (mPreviousDriver) {
if (AudioCallbackDriver* previousAudioCallback =
mPreviousDriver->AsAudioCallbackDriver()) {
LOG(LogLevel::Debug, ("Releasing audio driver off main thread."));
MOZ_ALWAYS_SUCCEEDS(
previousAudioCallback->mCubebOperationThread->Dispatch(
NS_NewRunnableFunction(
"AudioCallbackDriver previousDriver::Stop()",
[previousDriver = RefPtr{previousAudioCallback}] {
previousDriver->Stop();
})));
} else {
LOG(LogLevel::Debug,
("Dropping driver reference for SystemClockDriver."));
MOZ_ASSERT(mPreviousDriver->AsSystemClockDriver());
}
mPreviousDriver = nullptr;
}
LOG(LogLevel::Debug, ("Starting new audio driver off main thread, "
"to ensure it runs after previous shutdown."));
MOZ_ALWAYS_SUCCEEDS(mCubebOperationThread->Dispatch(
NS_NewRunnableFunction("AudioCallbackDriver Init()",
[self = RefPtr{this}, streamName = mStreamName] {
self->Init(streamName);
})));
}
bool AudioCallbackDriver::StartStream() {
TRACE("AudioCallbackDriver::StartStream");
MOZ_ASSERT(!IsStarted() && OnCubebOperationThread());
// Set STARTING before cubeb_stream_start, since starting the cubeb stream
// can result in a callback (that may read mAudioStreamState) before
// mAudioStreamState would otherwise be set.
mAudioStreamState = AudioStreamState::Starting;
if (cubeb_stream_start(mAudioStream) != CUBEB_OK) {
NS_WARNING("Could not start cubeb stream for MTG.");
return false;
}
return true;
}
void AudioCallbackDriver::Stop() {
LOG(LogLevel::Debug,
("%p: AudioCallbackDriver::Stop driver=%p", Graph(), this));
TRACE("AudioCallbackDriver::Stop");
MOZ_ASSERT(OnCubebOperationThread());
cubeb_stream_register_device_changed_callback(mAudioStream, nullptr);
if (cubeb_stream_stop(mAudioStream) != CUBEB_OK) {
NS_WARNING("Could not stop cubeb stream for MTG.");
} else {
mAudioStreamState = AudioStreamState::None;
}
}
void AudioCallbackDriver::Shutdown() {
MOZ_ASSERT(NS_IsMainThread());
RefPtr<FallbackWrapper> fallback;
{
auto fallbackLock = mFallback.Lock();
fallback = fallbackLock.ref();
fallbackLock.ref() = nullptr;
}
if (fallback) {
LOG(LogLevel::Debug,
("%p: Releasing fallback driver %p.", Graph(), fallback.get()));
fallback->Shutdown();
}
LOG(LogLevel::Debug,
("%p: Releasing audio driver off main thread (GraphDriver::Shutdown).",
Graph()));
nsLiteralCString reason("AudioCallbackDriver::Shutdown");
NS_DispatchAndSpinEventLoopUntilComplete(
reason, mCubebOperationThread,
NS_NewRunnableFunction(reason.get(),
[self = RefPtr{this}] { self->Stop(); }));
}
void AudioCallbackDriver::SetStreamName(const nsACString& aStreamName) {
MOZ_ASSERT(InIteration() || !ThreadRunning());
if (aStreamName == mStreamName) {
return;
}
// Record the stream name, which will be passed onto the next driver, if
// any, either from this driver or the fallback driver.
GraphDriver::SetStreamName(aStreamName);
{
auto fallbackLock = mFallback.Lock();
FallbackWrapper* fallback = fallbackLock.ref().get();
if (fallback) {
MOZ_ASSERT(fallback->InIteration());
fallback->SetStreamName(aStreamName);
}
}
AudioStreamState streamState = mAudioStreamState;
if (streamState != AudioStreamState::None &&
streamState != AudioStreamState::Stopping) {
MOZ_ALWAYS_SUCCEEDS(mCubebOperationThread->Dispatch(
NS_NewRunnableFunction("AudioCallbackDriver SetStreamName()",
[self = RefPtr{this}, streamName = mStreamName] {
self->SetCubebStreamName(streamName);
})));
}
}
/* static */
long AudioCallbackDriver::DataCallback_s(cubeb_stream* aStream, void* aUser,
const void* aInputBuffer,
void* aOutputBuffer, long aFrames) {
AudioCallbackDriver* driver = reinterpret_cast<AudioCallbackDriver*>(aUser);
return driver->DataCallback(static_cast<const AudioDataValue*>(aInputBuffer),
static_cast<AudioDataValue*>(aOutputBuffer),
aFrames);
}
/* static */
void AudioCallbackDriver::StateCallback_s(cubeb_stream* aStream, void* aUser,
cubeb_state aState) {
AudioCallbackDriver* driver = reinterpret_cast<AudioCallbackDriver*>(aUser);
driver->StateCallback(aState);
}
/* static */
void AudioCallbackDriver::DeviceChangedCallback_s(void* aUser) {
AudioCallbackDriver* driver = reinterpret_cast<AudioCallbackDriver*>(aUser);
driver->DeviceChangedCallback();
}
AudioCallbackDriver::AutoInCallback::AutoInCallback(
AudioCallbackDriver* aDriver)
: mDriver(aDriver) {
MOZ_ASSERT(mDriver->mAudioThreadIdInCb == std::thread::id());
mDriver->mAudioThreadIdInCb = std::this_thread::get_id();
}
AudioCallbackDriver::AutoInCallback::~AutoInCallback() {
MOZ_ASSERT(mDriver->mAudioThreadIdInCb == std::this_thread::get_id());
mDriver->mAudioThreadIdInCb = std::thread::id();
}
bool AudioCallbackDriver::CheckThreadIdChanged() {
ProfilerThreadId id = profiler_current_thread_id();
if (id != mAudioThreadId) {
mAudioThreadId = id;
return true;
}
return false;
}
long AudioCallbackDriver::DataCallback(const AudioDataValue* aInputBuffer,
AudioDataValue* aOutputBuffer,
long aFrames) {
if (!mSandboxed && CheckThreadIdChanged()) {
CallbackThreadRegistry::Get()->Register(mAudioThreadId,
"NativeAudioCallback");
}
if (mAudioStreamState.compareExchange(AudioStreamState::Starting,
AudioStreamState::Running)) {
LOG(LogLevel::Verbose, ("%p: AudioCallbackDriver %p First audio callback "
"close the Fallback driver",
Graph(), this));
}
FallbackDriverState fallbackState = mFallbackDriverState;
if (MOZ_UNLIKELY(fallbackState == FallbackDriverState::Stopped)) {
// We're supposed to stop.
PodZero(aOutputBuffer, aFrames * mOutputChannelCount);
if (!mSandboxed) {
CallbackThreadRegistry::Get()->Unregister(mAudioThreadId);
}
return aFrames - 1;
}
AudioStreamState audioStreamState = mAudioStreamState;
if (MOZ_UNLIKELY(audioStreamState == AudioStreamState::ChangingDevice ||
fallbackState == FallbackDriverState::Running)) {
// Wait for the fallback driver to stop. Wake it up so it can stop if it's
// sleeping.
LOG(LogLevel::Verbose,
("%p: AudioCallbackDriver %p Waiting for the Fallback driver to stop",
Graph(), this));
EnsureNextIteration();
PodZero(aOutputBuffer, aFrames * mOutputChannelCount);
return aFrames;
}
MOZ_ASSERT(audioStreamState == AudioStreamState::Running);
TRACE_AUDIO_CALLBACK_BUDGET("AudioCallbackDriver real-time budget", aFrames,
mSampleRate);
TRACE("AudioCallbackDriver::DataCallback");
#ifdef DEBUG
AutoInCallback aic(this);
#endif
uint32_t durationMS = aFrames * 1000 / mSampleRate;
// For now, simply average the duration with the previous
// duration so there is some damping against sudden changes.
if (!mIterationDurationMS) {
mIterationDurationMS = durationMS;
} else {
mIterationDurationMS = (mIterationDurationMS * 3) + durationMS;
mIterationDurationMS /= 4;
}
mBuffer.SetBuffer(aOutputBuffer, aFrames);
// fill part or all with leftover data from last iteration (since we
// align to Audio blocks)
uint32_t alreadyBuffered = mScratchBuffer.Empty(mBuffer);
// State computed time is decided by the audio callback's buffer length. We
// compute the iteration start and end from there, trying to keep the amount
// of buffering in the graph constant.
GraphTime nextStateComputedTime =
MediaTrackGraphImpl::RoundUpToEndOfAudioBlock(mStateComputedTime +
mBuffer.Available());
auto iterationStart = mIterationEnd;
// inGraph is the number of audio frames there is between the state time and
// the current time, i.e. the maximum theoretical length of the interval we
// could use as [iterationStart; mIterationEnd].
GraphTime inGraph = mStateComputedTime - iterationStart;
// We want the interval [iterationStart; mIterationEnd] to be before the
// interval [mStateComputedTime; nextStateComputedTime]. We also want
// the distance between these intervals to be roughly equivalent each time, to
// ensure there is no clock drift between current time and state time. Since
// we can't act on the state time because we have to fill the audio buffer, we
// reclock the current time against the state time, here.
mIterationEnd = iterationStart + 0.8 * inGraph;
LOG(LogLevel::Verbose,
("%p: interval[%ld; %ld] state[%ld; %ld] (frames: %ld) (durationMS: %u) "
"(duration ticks: %ld)",
Graph(), (long)iterationStart, (long)mIterationEnd,
(long)mStateComputedTime, (long)nextStateComputedTime, (long)aFrames,
(uint32_t)durationMS,
(long)(nextStateComputedTime - mStateComputedTime)));
if (mStateComputedTime < mIterationEnd) {
LOG(LogLevel::Error, ("%p: Media graph global underrun detected", Graph()));
MOZ_ASSERT_UNREACHABLE("We should not underrun in full duplex");
mIterationEnd = mStateComputedTime;
}
// Process mic data if any/needed
if (aInputBuffer && mInputChannelCount > 0) {
Graph()->NotifyInputData(aInputBuffer, static_cast<size_t>(aFrames),
mSampleRate, mInputChannelCount, alreadyBuffered);
}
IterationResult result =
Graph()->OneIteration(nextStateComputedTime, mIterationEnd, this);
mStateComputedTime = nextStateComputedTime;
MOZ_ASSERT(mBuffer.Available() == 0,
"The graph should have filled the buffer");
mBuffer.BufferFilled();
#ifdef MOZ_SAMPLE_TYPE_FLOAT32
// Prevent returning NaN to the OS mixer, and propagating NaN into the reverse
// stream of the AEC.
NaNToZeroInPlace(aOutputBuffer, aFrames * mOutputChannelCount);
#endif
#ifdef XP_MACOSX
// This only happens when the output is on a macbookpro's external speaker,
// that are stereo, but let's just be safe.
if (mNeedsPanning && mOutputChannelCount == 2) {
// hard pan to the right
for (uint32_t i = 0; i < aFrames * 2; i += 2) {
aOutputBuffer[i + 1] += aOutputBuffer[i];
aOutputBuffer[i] = 0.0;
}
}
#endif
// No-op if MOZ_DUMP_AUDIO is not defined as an environment variable
if (aInputBuffer) {
mInputStreamFile.Write(static_cast<const AudioDataValue*>(aInputBuffer),
aFrames * mInputChannelCount);
}
mOutputStreamFile.Write(static_cast<const AudioDataValue*>(aOutputBuffer),
aFrames * mOutputChannelCount);
if (result.IsStop()) {
if (mInputDeviceID) {
mGraphInterface->NotifyInputStopped();
}
// Signal that we have stopped.
result.Stopped();
// Update the flag before handing over the graph and going to drain.
mAudioStreamState = AudioStreamState::Stopping;
if (!mSandboxed) {
CallbackThreadRegistry::Get()->Unregister(mAudioThreadId);
}
return aFrames - 1;
}
if (GraphDriver* nextDriver = result.NextDriver()) {
LOG(LogLevel::Debug,
("%p: Switching to %s driver.", Graph(),
nextDriver->AsAudioCallbackDriver() ? "audio" : "system"));
if (mInputDeviceID) {
mGraphInterface->NotifyInputStopped();
}
result.Switched();
mAudioStreamState = AudioStreamState::Stopping;
nextDriver->SetState(mStreamName, mIterationEnd, mStateComputedTime);
nextDriver->Start();
if (!mSandboxed) {
CallbackThreadRegistry::Get()->Unregister(mAudioThreadId);
}
// Returning less than aFrames starts the draining and eventually stops the
// audio thread. This function will never get called again.
return aFrames - 1;
}
MOZ_ASSERT(result.IsStillProcessing());
return aFrames;
}
static const char* StateToString(cubeb_state aState) {
switch (aState) {
case CUBEB_STATE_STARTED:
return "STARTED";
case CUBEB_STATE_STOPPED:
return "STOPPED";
case CUBEB_STATE_DRAINED:
return "DRAINED";
case CUBEB_STATE_ERROR:
return "ERROR";
default:
MOZ_CRASH("Unexpected state!");
}
}
void AudioCallbackDriver::StateCallback(cubeb_state aState) {
MOZ_ASSERT(!InIteration());
LOG(LogLevel::Debug,
("AudioCallbackDriver(%p) State: %s", this, StateToString(aState)));
if (aState == CUBEB_STATE_STARTED || aState == CUBEB_STATE_STOPPED) {
// Nothing to do for STARTED.
//
// For STOPPED, don't reset mAudioStreamState until after
// cubeb_stream_stop() returns, as wasapi_stream_stop() dispatches
// CUBEB_STATE_STOPPED before ensuring that data callbacks have finished.
return;
}
AudioStreamState streamState = mAudioStreamState;
if (streamState < AudioStreamState::Starting) {
// mAudioStream has already entered STOPPED, DRAINED, or ERROR.
// Don't reset a Pending state indicating that a task to destroy
// mAudioStream and init a new cubeb_stream has already been triggered.
return;
}
// Reset for DRAINED or ERROR.
streamState = mAudioStreamState.exchange(AudioStreamState::None);
if (aState == CUBEB_STATE_ERROR) {
// About to hand over control of the graph. Do not start a new driver if
// StateCallback() receives an error for this stream while the main thread
// or another driver has control of the graph.
if (streamState == AudioStreamState::Starting ||
streamState == AudioStreamState::ChangingDevice ||
streamState == AudioStreamState::Running) {
if (mFallbackDriverState.compareExchange(FallbackDriverState::None,
FallbackDriverState::Running)) {
// Only switch to fallback if it's not already running. It could be
// running with the callback driver having started but not seen a single
// callback yet. I.e., handover from fallback to callback is not done.
if (mInputDeviceID) {
#ifdef DEBUG
// No audio callback after an error. We're calling into the graph here
// so we need to be regarded as "in iteration".
AutoInCallback aic(this);
#endif
mGraphInterface->NotifyInputStopped();
}
FallbackToSystemClockDriver();
}
}
}
}
void AudioCallbackDriver::MixerCallback(AudioChunk* aMixedBuffer,
uint32_t aSampleRate) {
MOZ_ASSERT(InIteration());
uint32_t toWrite = mBuffer.Available();
TrackTime frameCount = aMixedBuffer->mDuration;
if (!mBuffer.Available() && frameCount > 0) {
NS_WARNING("DataCallback buffer full, expect frame drops.");
}
MOZ_ASSERT(mBuffer.Available() <= frameCount);
mBuffer.WriteFrames(*aMixedBuffer, mBuffer.Available());
MOZ_ASSERT(mBuffer.Available() == 0,
"Missing frames to fill audio callback's buffer.");
if (toWrite == frameCount) {
return;
}
aMixedBuffer->SliceTo(toWrite, frameCount);
DebugOnly<uint32_t> written = mScratchBuffer.Fill(*aMixedBuffer);
NS_WARNING_ASSERTION(written == frameCount - toWrite, "Dropping frames.");
};
void AudioCallbackDriver::PanOutputIfNeeded(bool aMicrophoneActive) {
#ifdef XP_MACOSX
TRACE("AudioCallbackDriver::PanOutputIfNeeded");
cubeb_device* out = nullptr;
int rv;
char name[128];
size_t length = sizeof(name);
rv = sysctlbyname("hw.model", name, &length, NULL, 0);
if (rv) {
return;
}
int major, minor;
for (uint32_t i = 0; i < length; i++) {
// skip the model name
if (isalpha(name[i])) {
continue;
}
sscanf(name + i, "%d,%d", &major, &minor);
break;
}
enum MacbookModel { MacBook, MacBookPro, MacBookAir, NotAMacbook };
MacbookModel model;
if (!strncmp(name, "MacBookPro", length)) {
model = MacBookPro;
} else if (strncmp(name, "MacBookAir", length)) {
model = MacBookAir;
} else if (strncmp(name, "MacBook", length)) {
model = MacBook;
} else {
model = NotAMacbook;
}
// For macbook pro before 2016 model (change of chassis), hard pan the audio
// to the right if the speakers are in use to avoid feedback.
if (model == MacBookPro && major <= 12) {
if (cubeb_stream_get_current_device(mAudioStream, &out) == CUBEB_OK) {
MOZ_ASSERT(out);
// Check if we are currently outputing sound on external speakers.
if (out->output_name && !strcmp(out->output_name, "ispk")) {
// Pan everything to the right speaker.
LOG(LogLevel::Debug, ("Using the built-in speakers, with%s audio input",
aMicrophoneActive ? "" : "out"));
mNeedsPanning = aMicrophoneActive;
} else {
LOG(LogLevel::Debug, ("Using an external output device"));
mNeedsPanning = false;
}
cubeb_stream_device_destroy(mAudioStream, out);
}
}
#endif
}
void AudioCallbackDriver::DeviceChangedCallback() {
MOZ_ASSERT(!InIteration());
// Set this before the atomic write.
mChangingDeviceStartTime = TimeStamp::Now();
if (mAudioStreamState.compareExchange(AudioStreamState::Running,
AudioStreamState::ChangingDevice)) {
// Change to ChangingDevice only if we're running, i.e. there has been a
// data callback and no state callback saying otherwise.
// - If the audio stream is not running, it has either been stopped or it is
// starting. In the latter case we assume there will be no data callback
// coming until after the device change is done.
// - If the audio stream is running here, there is no guarantee from the
// cubeb mac backend that no more data callback will occur before the
// device change takes place. They will however stop *soon*, and we hope
// they stop before the first callback from the fallback driver. If the
// fallback driver callback occurs before the last data callback before
// the device switch, the worst case is that a long period of time
// (seconds) may pass without the graph getting iterated at all.
Result<bool, FallbackDriverState> res = TryStartingFallbackDriver();
LOG(LogLevel::Info,
("%p: AudioCallbackDriver %p underlying default device is changing. "
"Fallback %s.",
Graph(), this,
res.isOk() ? "started"
: (res.inspectErr() == FallbackDriverState::Running
? "already running"
: "has been stopped")));
if (res.isErr() && res.inspectErr() == FallbackDriverState::Stopped) {
mChangingDeviceStartTime = TimeStamp();
}
}
// Tell the audio engine the device has changed, it might want to reset some
// state.
Graph()->DeviceChanged();
#ifdef XP_MACOSX
RefPtr<AudioCallbackDriver> self(this);
bool hasInput = mInputChannelCount;
NS_DispatchBackgroundTask(NS_NewRunnableFunction(
"PanOutputIfNeeded", [self{std::move(self)}, hasInput]() {
self->PanOutputIfNeeded(hasInput);
}));
#endif
}
uint32_t AudioCallbackDriver::IterationDuration() {
MOZ_ASSERT(InIteration());
// The real fix would be to have an API in cubeb to give us the number. Short
return mIterationDurationMS;
}
void AudioCallbackDriver::EnsureNextIteration() {
if (mFallbackDriverState == FallbackDriverState::Running) {
auto fallback = mFallback.Lock();
if (fallback.ref()) {
fallback.ref()->EnsureNextIteration();
}
}
}
TimeDuration AudioCallbackDriver::AudioOutputLatency() {
TRACE("AudioCallbackDriver::AudioOutputLatency");
uint32_t latencyFrames;
int rv = cubeb_stream_get_latency(mAudioStream, &latencyFrames);
if (rv || mSampleRate == 0) {
return TimeDuration::FromSeconds(0.0);
}
return TimeDuration::FromSeconds(static_cast<double>(latencyFrames) /
mSampleRate);
}
bool AudioCallbackDriver::OnFallback() const {
MOZ_ASSERT(InIteration());
return mFallbackDriverState == FallbackDriverState::Running;
}
Result<bool, AudioCallbackDriver::FallbackDriverState>
AudioCallbackDriver::TryStartingFallbackDriver() {
FallbackDriverState oldState =
mFallbackDriverState.exchange(FallbackDriverState::Running);
switch (oldState) {
case FallbackDriverState::None:
// None -> Running: we can start the fallback.
FallbackToSystemClockDriver();
return true;
case FallbackDriverState::Stopped:
// Stopped -> Running: Invalid edge, the graph has told us to stop.
// Restore the state.
mFallbackDriverState = oldState;
[[fallthrough]];
case FallbackDriverState::Running:
// Nothing to do, return the state.
return Err(oldState);
}
MOZ_CRASH("Unexpected fallback state");
}
void AudioCallbackDriver::FallbackToSystemClockDriver() {
MOZ_ASSERT(mFallbackDriverState == FallbackDriverState::Running);
DebugOnly<AudioStreamState> audioStreamState =
static_cast<AudioStreamState>(mAudioStreamState);
MOZ_ASSERT(audioStreamState == AudioStreamState::None ||
audioStreamState == AudioStreamState::Pending ||
audioStreamState == AudioStreamState::ChangingDevice);
LOG(LogLevel::Debug,
("%p: AudioCallbackDriver %p Falling back to SystemClockDriver.", Graph(),
this));
mNextReInitBackoffStep =
TimeDuration::FromMilliseconds(AUDIO_INITIAL_FALLBACK_BACKOFF_STEP_MS);
mNextReInitAttempt = TimeStamp::Now() + mNextReInitBackoffStep;
auto fallback =
MakeRefPtr<FallbackWrapper>(Graph(), this, mSampleRate, mStreamName,
mIterationEnd, mStateComputedTime);
{
auto driver = mFallback.Lock();
MOZ_RELEASE_ASSERT(!driver.ref());
driver.ref() = fallback;
}
fallback->Start();
}
void AudioCallbackDriver::FallbackDriverStopped(GraphTime aIterationEnd,
GraphTime aStateComputedTime,
FallbackDriverState aState) {
mIterationEnd = aIterationEnd;
mStateComputedTime = aStateComputedTime;
mNextReInitAttempt = TimeStamp();
mNextReInitBackoffStep = TimeDuration();
{
auto fallback = mFallback.Lock();
MOZ_ASSERT(fallback.ref()->OnThread());
fallback.ref() = nullptr;
}
MOZ_ASSERT(aState == FallbackDriverState::None ||
aState == FallbackDriverState::Stopped);
mFallbackDriverState = aState;
AudioStreamState audioState = mAudioStreamState;
LOG(LogLevel::Debug,
("%p: AudioCallbackDriver %p Fallback driver stopped.%s%s", Graph(), this,
aState == FallbackDriverState::Stopped ? " Draining." : "",
aState == FallbackDriverState::None &&
audioState == AudioStreamState::ChangingDevice
? " Starting another due to device change."
: ""));
if (aState == FallbackDriverState::None) {
MOZ_ASSERT(audioState == AudioStreamState::Running ||
audioState == AudioStreamState::ChangingDevice);
if (audioState == AudioStreamState::ChangingDevice) {
MOZ_ALWAYS_OK(TryStartingFallbackDriver());
}
}
}
void AudioCallbackDriver::MaybeStartAudioStream() {
AudioStreamState streamState = mAudioStreamState;
if (streamState != AudioStreamState::None) {
LOG(LogLevel::Verbose,
("%p: AudioCallbackDriver %p Cannot re-init.", Graph(), this));
return;
}
TimeStamp now = TimeStamp::Now();
if (now < mNextReInitAttempt) {
LOG(LogLevel::Verbose,
("%p: AudioCallbackDriver %p Not time to re-init yet. %.3fs left.",
Graph(), this, (mNextReInitAttempt - now).ToSeconds()));
return;
}
LOG(LogLevel::Debug, ("%p: AudioCallbackDriver %p Attempting to re-init "
"audio stream from fallback driver.",
Graph(), this));
mNextReInitBackoffStep =
std::min(mNextReInitBackoffStep * 2,
TimeDuration::FromMilliseconds(
StaticPrefs::media_audio_device_retry_ms()));
mNextReInitAttempt = now + mNextReInitBackoffStep;
Start();
}
} // namespace mozilla
// avoid redefined macro in unified build
#undef LOG