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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* 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
#include "AudioDestinationNode.h"
#include "AlignmentUtils.h"
#include "AudibilityMonitor.h"
#include "AudioContext.h"
#include "AudioNodeEngine.h"
#include "AudioNodeTrack.h"
#include "CubebUtils.h"
#include "MediaTrackGraph.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/dom/AudioDestinationNodeBinding.h"
#include "mozilla/dom/BaseAudioContextBinding.h"
#include "mozilla/dom/OfflineAudioCompletionEvent.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/WakeLock.h"
#include "mozilla/dom/power/PowerManagerService.h"
#include "mozilla/Telemetry.h"
#include "mozilla/TelemetryHistogramEnums.h"
#include "nsContentUtils.h"
#include "nsGlobalWindowInner.h"
#include "Tracing.h"
extern mozilla::LazyLogModule gAudioChannelLog;
#define AUDIO_CHANNEL_LOG(msg, ...) \
MOZ_LOG(gAudioChannelLog, LogLevel::Debug, (msg, ##__VA_ARGS__))
namespace mozilla::dom {
namespace {
class OnCompleteTask final : public Runnable {
public:
OnCompleteTask(AudioContext* aAudioContext, AudioBuffer* aRenderedBuffer)
: Runnable("dom::OfflineDestinationNodeEngine::OnCompleteTask"),
mAudioContext(aAudioContext),
mRenderedBuffer(aRenderedBuffer) {}
NS_IMETHOD Run() override {
OfflineAudioCompletionEventInit param;
param.mRenderedBuffer = mRenderedBuffer;
RefPtr<OfflineAudioCompletionEvent> event =
OfflineAudioCompletionEvent::Constructor(mAudioContext, u"complete"_ns,
param);
mAudioContext->DispatchTrustedEvent(event);
return NS_OK;
}
private:
RefPtr<AudioContext> mAudioContext;
RefPtr<AudioBuffer> mRenderedBuffer;
};
} // anonymous namespace
class OfflineDestinationNodeEngine final : public AudioNodeEngine {
public:
explicit OfflineDestinationNodeEngine(AudioDestinationNode* aNode)
: AudioNodeEngine(aNode),
mWriteIndex(0),
mNumberOfChannels(aNode->ChannelCount()),
mLength(aNode->Length()),
mSampleRate(aNode->Context()->SampleRate()),
mBufferAllocated(false) {}
void ProcessBlock(AudioNodeTrack* aTrack, GraphTime aFrom,
const AudioBlock& aInput, AudioBlock* aOutput,
bool* aFinished) override {
TRACE("OfflineDestinationNodeEngine::ProcessBlock");
// Do this just for the sake of political correctness; this output
// will not go anywhere.
*aOutput = aInput;
// The output buffer is allocated lazily, on the rendering thread, when
// non-null input is received.
if (!mBufferAllocated && !aInput.IsNull()) {
// These allocations might fail if content provides a huge number of
// channels or size, but it's OK since we'll deal with the failure
// gracefully.
mBuffer = ThreadSharedFloatArrayBufferList::Create(mNumberOfChannels,
mLength, fallible);
if (mBuffer && mWriteIndex) {
// Zero leading for any null chunks that were skipped.
for (uint32_t i = 0; i < mNumberOfChannels; ++i) {
float* channelData = mBuffer->GetDataForWrite(i);
PodZero(channelData, mWriteIndex);
}
}
mBufferAllocated = true;
}
// Skip copying if there is no buffer.
uint32_t outputChannelCount = mBuffer ? mNumberOfChannels : 0;
// Record our input buffer
MOZ_ASSERT(mWriteIndex < mLength, "How did this happen?");
const uint32_t duration =
std::min(WEBAUDIO_BLOCK_SIZE, mLength - mWriteIndex);
const uint32_t inputChannelCount = aInput.ChannelCount();
for (uint32_t i = 0; i < outputChannelCount; ++i) {
float* outputData = mBuffer->GetDataForWrite(i) + mWriteIndex;
if (aInput.IsNull() || i >= inputChannelCount) {
PodZero(outputData, duration);
} else {
const float* inputBuffer =
static_cast<const float*>(aInput.mChannelData[i]);
if (duration == WEBAUDIO_BLOCK_SIZE && IS_ALIGNED16(inputBuffer)) {
// Use the optimized version of the copy with scale operation
AudioBlockCopyChannelWithScale(inputBuffer, aInput.mVolume,
outputData);
} else {
if (aInput.mVolume == 1.0f) {
PodCopy(outputData, inputBuffer, duration);
} else {
for (uint32_t j = 0; j < duration; ++j) {
outputData[j] = aInput.mVolume * inputBuffer[j];
}
}
}
}
}
mWriteIndex += duration;
if (mWriteIndex >= mLength) {
NS_ASSERTION(mWriteIndex == mLength, "Overshot length");
// Go to finished state. When the graph's current time eventually reaches
// the end of the track, then the main thread will be notified and we'll
// shut down the AudioContext.
*aFinished = true;
}
}
bool IsActive() const override {
// Keep processing to track track time, which is used for all timelines
// associated with the same AudioContext.
return true;
}
already_AddRefed<AudioBuffer> CreateAudioBuffer(AudioContext* aContext) {
MOZ_ASSERT(NS_IsMainThread());
// Create the input buffer
ErrorResult rv;
RefPtr<AudioBuffer> renderedBuffer =
AudioBuffer::Create(aContext->GetOwnerWindow(), mNumberOfChannels,
mLength, mSampleRate, mBuffer.forget(), rv);
if (rv.Failed()) {
rv.SuppressException();
return nullptr;
}
return renderedBuffer.forget();
}
size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const override {
size_t amount = AudioNodeEngine::SizeOfExcludingThis(aMallocSizeOf);
if (mBuffer) {
amount += mBuffer->SizeOfIncludingThis(aMallocSizeOf);
}
return amount;
}
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override {
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
private:
// The input to the destination node is recorded in mBuffer.
// When this buffer fills up with mLength frames, the buffered input is sent
// to the main thread in order to dispatch OfflineAudioCompletionEvent.
RefPtr<ThreadSharedFloatArrayBufferList> mBuffer;
// An index representing the next offset in mBuffer to be written to.
uint32_t mWriteIndex;
uint32_t mNumberOfChannels;
// How many frames the OfflineAudioContext intends to produce.
uint32_t mLength;
float mSampleRate;
bool mBufferAllocated;
};
class DestinationNodeEngine final : public AudioNodeEngine {
public:
explicit DestinationNodeEngine(AudioDestinationNode* aNode)
: AudioNodeEngine(aNode),
mSampleRate(CubebUtils::PreferredSampleRate(
aNode->Context()->ShouldResistFingerprinting())),
mVolume(1.0f),
mAudibilityMonitor(
mSampleRate,
StaticPrefs::dom_media_silence_duration_for_audibility()),
mSuspended(false),
mIsAudible(false) {
MOZ_ASSERT(aNode);
}
void ProcessBlock(AudioNodeTrack* aTrack, GraphTime aFrom,
const AudioBlock& aInput, AudioBlock* aOutput,
bool* aFinished) override {
TRACE("DestinationNodeEngine::ProcessBlock");
*aOutput = aInput;
aOutput->mVolume *= mVolume;
if (mSuspended) {
return;
}
mAudibilityMonitor.Process(aInput);
bool isAudible =
mAudibilityMonitor.RecentlyAudible() && aOutput->mVolume > 0.0;
if (isAudible != mIsAudible) {
mIsAudible = isAudible;
RefPtr<AudioNodeTrack> track = aTrack;
auto r = [track, isAudible]() -> void {
MOZ_ASSERT(NS_IsMainThread());
RefPtr<AudioNode> node = track->Engine()->NodeMainThread();
if (node) {
RefPtr<AudioDestinationNode> destinationNode =
static_cast<AudioDestinationNode*>(node.get());
destinationNode->NotifyDataAudibleStateChanged(isAudible);
}
};
aTrack->Graph()->DispatchToMainThreadStableState(NS_NewRunnableFunction(
"dom::WebAudioAudibleStateChangedRunnable", r));
}
}
bool IsActive() const override {
// Keep processing to track track time, which is used for all timelines
// associated with the same AudioContext. If there are no other engines
// for the AudioContext, then this could return false to suspend the
// track, but the track is blocked anyway through
// AudioDestinationNode::SetIsOnlyNodeForContext().
return true;
}
void SetDoubleParameter(uint32_t aIndex, double aParam) override {
if (aIndex == VOLUME) {
mVolume = static_cast<float>(aParam);
}
}
void SetInt32Parameter(uint32_t aIndex, int32_t aParam) override {
if (aIndex == SUSPENDED) {
mSuspended = !!aParam;
if (mSuspended) {
mIsAudible = false;
}
}
}
enum Parameters {
VOLUME,
SUSPENDED,
};
size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const override {
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
private:
int mSampleRate;
float mVolume;
AudibilityMonitor mAudibilityMonitor;
bool mSuspended;
bool mIsAudible;
};
NS_IMPL_CYCLE_COLLECTION_INHERITED(AudioDestinationNode, AudioNode,
mAudioChannelAgent, mOfflineRenderingPromise)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(AudioDestinationNode)
NS_INTERFACE_MAP_ENTRY(nsIAudioChannelAgentCallback)
NS_INTERFACE_MAP_END_INHERITING(AudioNode)
NS_IMPL_ADDREF_INHERITED(AudioDestinationNode, AudioNode)
NS_IMPL_RELEASE_INHERITED(AudioDestinationNode, AudioNode)
const AudioNodeTrack::Flags kTrackFlags =
AudioNodeTrack::NEED_MAIN_THREAD_CURRENT_TIME |
AudioNodeTrack::NEED_MAIN_THREAD_ENDED | AudioNodeTrack::EXTERNAL_OUTPUT;
AudioDestinationNode::AudioDestinationNode(AudioContext* aContext,
bool aIsOffline,
uint32_t aNumberOfChannels,
uint32_t aLength)
: AudioNode(aContext, aNumberOfChannels, ChannelCountMode::Explicit,
ChannelInterpretation::Speakers),
mFramesToProduce(aLength),
mIsOffline(aIsOffline) {
if (aIsOffline) {
// The track is created on demand to avoid creating a graph thread that
// may not be used.
return;
}
// GetParentObject can return nullptr here. This will end up creating another
// MediaTrackGraph
MediaTrackGraph* graph = MediaTrackGraph::GetInstance(
MediaTrackGraph::AUDIO_THREAD_DRIVER, aContext->GetOwnerWindow(),
aContext->SampleRate(), MediaTrackGraph::DEFAULT_OUTPUT_DEVICE);
AudioNodeEngine* engine = new DestinationNodeEngine(this);
mTrack = AudioNodeTrack::Create(aContext, engine, kTrackFlags, graph);
mTrack->AddMainThreadListener(this);
// null key is fine: only one output per mTrack
mTrack->AddAudioOutput(nullptr, nullptr);
}
void AudioDestinationNode::Init() {
// The reason we don't do that in ctor is because we have to keep AudioContext
// holding a strong reference to the destination node first. If we don't do
// that, initializing the agent would cause an unexpected destroy of the
// destination node when destroying the local weak reference inside
// `InitWithWeakCallback()`.
if (!mIsOffline) {
CreateAndStartAudioChannelAgent();
}
}
void AudioDestinationNode::Close() {
DestroyAudioChannelAgentIfExists();
ReleaseAudioWakeLockIfExists();
}
void AudioDestinationNode::CreateAndStartAudioChannelAgent() {
MOZ_ASSERT(!mIsOffline);
MOZ_ASSERT(!mAudioChannelAgent);
AudioChannelAgent* agent = new AudioChannelAgent();
nsresult rv = agent->InitWithWeakCallback(GetOwnerWindow(), this);
if (NS_WARN_IF(NS_FAILED(rv))) {
AUDIO_CHANNEL_LOG("Failed to init audio channel agent");
return;
}
AudibleState state =
IsAudible() ? AudibleState::eAudible : AudibleState::eNotAudible;
rv = agent->NotifyStartedPlaying(state);
if (NS_WARN_IF(NS_FAILED(rv))) {
AUDIO_CHANNEL_LOG("Failed to start audio channel agent");
return;
}
mAudioChannelAgent = agent;
mAudioChannelAgent->PullInitialUpdate();
}
AudioDestinationNode::~AudioDestinationNode() {
MOZ_ASSERT(!mAudioChannelAgent);
MOZ_ASSERT(!mWakeLock);
MOZ_ASSERT(!mCaptureTrackPort);
}
size_t AudioDestinationNode::SizeOfExcludingThis(
MallocSizeOf aMallocSizeOf) const {
size_t amount = AudioNode::SizeOfExcludingThis(aMallocSizeOf);
// Might be useful in the future:
// - mAudioChannelAgent
return amount;
}
size_t AudioDestinationNode::SizeOfIncludingThis(
MallocSizeOf aMallocSizeOf) const {
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
AudioNodeTrack* AudioDestinationNode::Track() {
if (mTrack) {
return mTrack;
}
AudioContext* context = Context();
if (!context) { // This node has been unlinked.
return nullptr;
}
MOZ_ASSERT(mIsOffline, "Realtime tracks are created in constructor");
// GetParentObject can return nullptr here when the document has been
// unlinked.
MediaTrackGraph* graph =
MediaTrackGraph::CreateNonRealtimeInstance(context->SampleRate());
AudioNodeEngine* engine = new OfflineDestinationNodeEngine(this);
mTrack = AudioNodeTrack::Create(context, engine, kTrackFlags, graph);
mTrack->AddMainThreadListener(this);
return mTrack;
}
void AudioDestinationNode::DestroyAudioChannelAgentIfExists() {
if (mAudioChannelAgent) {
mAudioChannelAgent->NotifyStoppedPlaying();
mAudioChannelAgent = nullptr;
if (IsCapturingAudio()) {
StopAudioCapturingTrack();
}
}
}
void AudioDestinationNode::DestroyMediaTrack() {
Close();
if (!mTrack) {
return;
}
Context()->ShutdownWorklet();
mTrack->RemoveMainThreadListener(this);
AudioNode::DestroyMediaTrack();
}
void AudioDestinationNode::NotifyMainThreadTrackEnded() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mTrack->IsEnded());
if (mIsOffline) {
AbstractThread::MainThread()->Dispatch(NewRunnableMethod(
"dom::AudioDestinationNode::FireOfflineCompletionEvent", this,
&AudioDestinationNode::FireOfflineCompletionEvent));
}
}
void AudioDestinationNode::FireOfflineCompletionEvent() {
AudioContext* context = Context();
context->OfflineClose();
OfflineDestinationNodeEngine* engine =
static_cast<OfflineDestinationNodeEngine*>(Track()->Engine());
RefPtr<AudioBuffer> renderedBuffer = engine->CreateAudioBuffer(context);
if (!renderedBuffer) {
return;
}
ResolvePromise(renderedBuffer);
context->Dispatch(do_AddRef(new OnCompleteTask(context, renderedBuffer)));
context->OnStateChanged(nullptr, AudioContextState::Closed);
mOfflineRenderingRef.Drop(this);
}
void AudioDestinationNode::ResolvePromise(AudioBuffer* aRenderedBuffer) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mIsOffline);
mOfflineRenderingPromise->MaybeResolve(aRenderedBuffer);
}
uint32_t AudioDestinationNode::MaxChannelCount() const {
return Context()->MaxChannelCount();
}
void AudioDestinationNode::SetChannelCount(uint32_t aChannelCount,
ErrorResult& aRv) {
if (aChannelCount > MaxChannelCount()) {
aRv.ThrowIndexSizeError(
nsPrintfCString("%u is larger than maxChannelCount", aChannelCount));
return;
}
if (aChannelCount == ChannelCount()) {
return;
}
AudioNode::SetChannelCount(aChannelCount, aRv);
}
void AudioDestinationNode::Mute() {
MOZ_ASSERT(Context() && !Context()->IsOffline());
SendDoubleParameterToTrack(DestinationNodeEngine::VOLUME, 0.0f);
}
void AudioDestinationNode::Unmute() {
MOZ_ASSERT(Context() && !Context()->IsOffline());
SendDoubleParameterToTrack(DestinationNodeEngine::VOLUME, 1.0f);
}
void AudioDestinationNode::Suspend() {
SendInt32ParameterToTrack(DestinationNodeEngine::SUSPENDED, 1);
}
void AudioDestinationNode::Resume() {
SendInt32ParameterToTrack(DestinationNodeEngine::SUSPENDED, 0);
}
void AudioDestinationNode::NotifyAudioContextStateChanged() {
UpdateFinalAudibleStateIfNeeded(AudibleChangedReasons::ePauseStateChanged);
}
void AudioDestinationNode::OfflineShutdown() {
MOZ_ASSERT(Context() && Context()->IsOffline(),
"Should only be called on a valid OfflineAudioContext");
mOfflineRenderingRef.Drop(this);
}
JSObject* AudioDestinationNode::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return AudioDestinationNode_Binding::Wrap(aCx, this, aGivenProto);
}
void AudioDestinationNode::StartRendering(Promise* aPromise) {
mOfflineRenderingPromise = aPromise;
mOfflineRenderingRef.Take(this);
Track()->Graph()->StartNonRealtimeProcessing(mFramesToProduce);
}
NS_IMETHODIMP
AudioDestinationNode::WindowVolumeChanged(float aVolume, bool aMuted) {
MOZ_ASSERT(mAudioChannelAgent);
if (!mTrack) {
return NS_OK;
}
AUDIO_CHANNEL_LOG(
"AudioDestinationNode %p WindowVolumeChanged, "
"aVolume = %f, aMuted = %s\n",
this, aVolume, aMuted ? "true" : "false");
mAudioChannelVolume = aMuted ? 0.0f : aVolume;
mTrack->SetAudioOutputVolume(nullptr, mAudioChannelVolume);
UpdateFinalAudibleStateIfNeeded(AudibleChangedReasons::eVolumeChanged);
return NS_OK;
}
NS_IMETHODIMP
AudioDestinationNode::WindowSuspendChanged(nsSuspendedTypes aSuspend) {
MOZ_ASSERT(mAudioChannelAgent);
if (!mTrack) {
return NS_OK;
}
const bool shouldDisable = aSuspend == nsISuspendedTypes::SUSPENDED_BLOCK;
if (mAudioChannelDisabled == shouldDisable) {
return NS_OK;
}
mAudioChannelDisabled = shouldDisable;
AUDIO_CHANNEL_LOG(
"AudioDestinationNode %p WindowSuspendChanged, shouldDisable = %d\n",
this, mAudioChannelDisabled);
DisabledTrackMode disabledMode = mAudioChannelDisabled
? DisabledTrackMode::SILENCE_BLACK
: DisabledTrackMode::ENABLED;
mTrack->SetDisabledTrackMode(disabledMode);
UpdateFinalAudibleStateIfNeeded(AudibleChangedReasons::ePauseStateChanged);
return NS_OK;
}
NS_IMETHODIMP
AudioDestinationNode::WindowAudioCaptureChanged(bool aCapture) {
MOZ_ASSERT(mAudioChannelAgent);
if (!mTrack) {
return NS_OK;
}
if (!GetOwnerWindow()) {
return NS_OK;
}
if (aCapture == IsCapturingAudio()) {
return NS_OK;
}
if (aCapture) {
StartAudioCapturingTrack();
} else {
StopAudioCapturingTrack();
}
return NS_OK;
}
bool AudioDestinationNode::IsCapturingAudio() const {
return mCaptureTrackPort != nullptr;
}
void AudioDestinationNode::StartAudioCapturingTrack() {
MOZ_ASSERT(!IsCapturingAudio());
nsGlobalWindowInner* window = Context()->GetOwnerWindow();
uint64_t id = window->WindowID();
mCaptureTrackPort = mTrack->Graph()->ConnectToCaptureTrack(id, mTrack);
}
void AudioDestinationNode::StopAudioCapturingTrack() {
MOZ_ASSERT(IsCapturingAudio());
mCaptureTrackPort->Destroy();
mCaptureTrackPort = nullptr;
}
void AudioDestinationNode::CreateAudioWakeLockIfNeeded() {
if (!mWakeLock && IsAudible()) {
RefPtr<power::PowerManagerService> pmService =
power::PowerManagerService::GetInstance();
NS_ENSURE_TRUE_VOID(pmService);
ErrorResult rv;
mWakeLock =
pmService->NewWakeLock(u"audio-playing"_ns, GetOwnerWindow(), rv);
}
}
void AudioDestinationNode::ReleaseAudioWakeLockIfExists() {
if (mWakeLock) {
IgnoredErrorResult rv;
mWakeLock->Unlock(rv);
mWakeLock = nullptr;
}
}
void AudioDestinationNode::NotifyDataAudibleStateChanged(bool aAudible) {
MOZ_ASSERT(!mIsOffline);
AUDIO_CHANNEL_LOG(
"AudioDestinationNode %p NotifyDataAudibleStateChanged, audible=%d", this,
aAudible);
mIsDataAudible = aAudible;
UpdateFinalAudibleStateIfNeeded(AudibleChangedReasons::eDataAudibleChanged);
}
void AudioDestinationNode::UpdateFinalAudibleStateIfNeeded(
AudibleChangedReasons aReason) {
// The audio context has been closed and we've destroyed the agent.
if (!mAudioChannelAgent) {
return;
}
const bool newAudibleState = IsAudible();
if (mFinalAudibleState == newAudibleState) {
return;
}
AUDIO_CHANNEL_LOG("AudioDestinationNode %p Final audible state=%d", this,
newAudibleState);
mFinalAudibleState = newAudibleState;
AudibleState state =
mFinalAudibleState ? AudibleState::eAudible : AudibleState::eNotAudible;
mAudioChannelAgent->NotifyStartedAudible(state, aReason);
if (mFinalAudibleState) {
CreateAudioWakeLockIfNeeded();
} else {
ReleaseAudioWakeLockIfExists();
}
}
bool AudioDestinationNode::IsAudible() const {
// The desitionation node will be regarded as audible if all following
// conditions are true.
// (1) data audible state : both audio input and output are audible
// (2) window audible state : the tab isn't muted by tab sound indicator
// (3) audio context state : audio context should be running
return Context()->State() == AudioContextState::Running && mIsDataAudible &&
mAudioChannelVolume != 0.0;
}
} // namespace mozilla::dom