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gecko-dev/dom/media/MediaDevices.cpp

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/* 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 "mozilla/dom/MediaDevices.h"
#include "AudioDeviceInfo.h"
#include "MediaEngine.h"
#include "MediaEngineFake.h"
#include "mozilla/dom/BrowsingContext.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/FeaturePolicyUtils.h"
#include "mozilla/dom/MediaStreamBinding.h"
#include "mozilla/dom/MediaDeviceInfo.h"
#include "mozilla/dom/MediaDevicesBinding.h"
#include "mozilla/dom/NavigatorBinding.h"
#include "mozilla/dom/Promise.h"
#include "mozilla/dom/WindowContext.h"
#include "mozilla/intl/Localization.h"
#include "mozilla/MediaManager.h"
#include "mozilla/StaticPrefs_media.h"
#include "MediaTrackConstraints.h"
#include "nsContentUtils.h"
#include "nsINamed.h"
#include "nsIScriptGlobalObject.h"
#include "nsPIDOMWindow.h"
#include "nsGlobalWindowInner.h"
#include "nsQueryObject.h"
namespace mozilla::dom {
using ConstDeviceSetPromise = MediaManager::ConstDeviceSetPromise;
using LocalDeviceSetPromise = MediaManager::LocalDeviceSetPromise;
using LocalMediaDeviceSetRefCnt = MediaManager::LocalMediaDeviceSetRefCnt;
using MediaDeviceSetRefCnt = MediaManager::MediaDeviceSetRefCnt;
using mozilla::intl::Localization;
MediaDevices::MediaDevices(nsPIDOMWindowInner* aWindow)
: DOMEventTargetHelper(aWindow), mDefaultOutputLabel(VoidString()) {}
MediaDevices::~MediaDevices() {
MOZ_ASSERT(NS_IsMainThread());
mDeviceChangeListener.DisconnectIfExists();
}
already_AddRefed<Promise> MediaDevices::GetUserMedia(
const MediaStreamConstraints& aConstraints, CallerType aCallerType,
ErrorResult& aRv) {
MOZ_ASSERT(NS_IsMainThread());
// Get the relevant global for the promise from the wrapper cache because
// DOMEventTargetHelper::GetOwner() returns null if the document is unloaded.
// We know the wrapper exists because it is being used for |this| from JS.
// See https://github.com/heycam/webidl/issues/932 for why the relevant
// global is used instead of the current global.
nsCOMPtr<nsIGlobalObject> global = xpc::NativeGlobal(GetWrapper());
// global is a window because MediaDevices is exposed only to Window.
nsCOMPtr<nsPIDOMWindowInner> owner = do_QueryInterface(global);
if (Document* doc = owner->GetExtantDoc()) {
if (!owner->IsSecureContext()) {
doc->SetUseCounter(eUseCounter_custom_GetUserMediaInsec);
}
Document* topDoc = doc->GetTopLevelContentDocumentIfSameProcess();
IgnoredErrorResult ignored;
if (topDoc && !topDoc->HasFocus(ignored)) {
doc->SetUseCounter(eUseCounter_custom_GetUserMediaUnfocused);
}
}
RefPtr<Promise> p = Promise::Create(global, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
/* If requestedMediaTypes is the empty set, return a promise rejected with a
* TypeError. */
if (!MediaManager::IsOn(aConstraints.mVideo) &&
!MediaManager::IsOn(aConstraints.mAudio)) {
p->MaybeRejectWithTypeError("audio and/or video is required");
return p.forget();
}
/* If the relevant settings object's responsible document is NOT fully
* active, return a promise rejected with a DOMException object whose name
* attribute has the value "InvalidStateError". */
if (!owner->IsFullyActive()) {
p->MaybeRejectWithInvalidStateError("The document is not fully active.");
return p.forget();
}
const OwningBooleanOrMediaTrackConstraints& video = aConstraints.mVideo;
if (aCallerType != CallerType::System && video.IsMediaTrackConstraints()) {
const Optional<nsString>& mediaSource =
video.GetAsMediaTrackConstraints().mMediaSource;
if (mediaSource.WasPassed() &&
!mediaSource.Value().EqualsLiteral("camera")) {
WindowContext* wc = owner->GetWindowContext();
if (!wc || !wc->HasValidTransientUserGestureActivation()) {
p->MaybeRejectWithInvalidStateError(
"Display capture requires transient activation "
"from a user gesture.");
return p.forget();
}
}
}
RefPtr<MediaDevices> self(this);
GetUserMedia(owner, aConstraints, aCallerType)
->Then(
GetCurrentSerialEventTarget(), __func__,
[this, self, p](RefPtr<DOMMediaStream>&& aStream) {
if (!GetWindowIfCurrent()) {
return; // Leave Promise pending after navigation by design.
}
p->MaybeResolve(std::move(aStream));
},
[this, self, p](const RefPtr<MediaMgrError>& error) {
nsPIDOMWindowInner* window = GetWindowIfCurrent();
if (!window) {
return; // Leave Promise pending after navigation by design.
}
error->Reject(p);
});
return p.forget();
}
RefPtr<MediaDevices::StreamPromise> MediaDevices::GetUserMedia(
nsPIDOMWindowInner* aWindow, const MediaStreamConstraints& aConstraints,
CallerType aCallerType) {
MOZ_ASSERT(NS_IsMainThread());
bool haveFake = aConstraints.mFake.WasPassed() && aConstraints.mFake.Value();
const OwningBooleanOrMediaTrackConstraints& video = aConstraints.mVideo;
const OwningBooleanOrMediaTrackConstraints& audio = aConstraints.mAudio;
bool isMicrophone =
!haveFake &&
(audio.IsBoolean()
? audio.GetAsBoolean()
: !audio.GetAsMediaTrackConstraints().mMediaSource.WasPassed());
bool isCamera =
!haveFake &&
(video.IsBoolean()
? video.GetAsBoolean()
: !video.GetAsMediaTrackConstraints().mMediaSource.WasPassed());
RefPtr<MediaDevices> self(this);
return MediaManager::Get()
->GetUserMedia(aWindow, aConstraints, aCallerType)
->Then(
GetCurrentSerialEventTarget(), __func__,
[this, self, isMicrophone,
isCamera](RefPtr<DOMMediaStream>&& aStream) {
if (isMicrophone) {
mCanExposeMicrophoneInfo = true;
}
if (isCamera) {
mCanExposeCameraInfo = true;
}
return StreamPromise::CreateAndResolve(std::move(aStream),
__func__);
},
[](RefPtr<MediaMgrError>&& aError) {
return StreamPromise::CreateAndReject(std::move(aError), __func__);
});
}
already_AddRefed<Promise> MediaDevices::EnumerateDevices(ErrorResult& aRv) {
MOZ_ASSERT(NS_IsMainThread());
nsCOMPtr<nsIGlobalObject> global = xpc::NativeGlobal(GetWrapper());
nsCOMPtr<nsPIDOMWindowInner> owner = do_QueryInterface(global);
if (Document* doc = owner->GetExtantDoc()) {
if (!owner->IsSecureContext()) {
doc->SetUseCounter(eUseCounter_custom_EnumerateDevicesInsec);
}
Document* topDoc = doc->GetTopLevelContentDocumentIfSameProcess();
IgnoredErrorResult ignored;
if (topDoc && !topDoc->HasFocus(ignored)) {
doc->SetUseCounter(eUseCounter_custom_EnumerateDevicesUnfocused);
}
}
RefPtr<Promise> p = Promise::Create(global, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
mPendingEnumerateDevicesPromises.AppendElement(p);
MaybeResumeDeviceExposure();
return p.forget();
}
void MediaDevices::MaybeResumeDeviceExposure() {
if (mPendingEnumerateDevicesPromises.IsEmpty() &&
!mHaveUnprocessedDeviceListChange) {
return;
}
nsPIDOMWindowInner* window = GetOwner();
if (!window || !window->IsFullyActive()) {
return;
}
if (!StaticPrefs::media_devices_unfocused_enabled()) {
// Device list changes are not exposed to unfocused contexts because the
// timing information would allow fingerprinting for content to identify
// concurrent browsing, even when pages are in different containers.
BrowsingContext* bc = window->GetBrowsingContext();
if (!bc->IsActive() || // background tab or browser window fully obscured
!bc->GetIsActiveBrowserWindow()) { // browser window without focus
return;
}
}
MediaManager::Get()->GetPhysicalDevices()->Then(
GetCurrentSerialEventTarget(), __func__,
[self = RefPtr(this), this,
haveDeviceListChange = mHaveUnprocessedDeviceListChange,
enumerateDevicesPromises = std::move(mPendingEnumerateDevicesPromises)](
RefPtr<const MediaDeviceSetRefCnt> aAllDevices) mutable {
RefPtr<MediaDeviceSetRefCnt> exposedDevices =
FilterExposedDevices(*aAllDevices);
if (haveDeviceListChange) {
if (ShouldQueueDeviceChange(*exposedDevices)) {
NS_DispatchToCurrentThread(NS_NewRunnableFunction(
"devicechange", [self = RefPtr(this), this] {
DispatchTrustedEvent(u"devicechange"_ns);
}));
}
mLastPhysicalDevices = std::move(aAllDevices);
}
if (!enumerateDevicesPromises.IsEmpty()) {
ResumeEnumerateDevices(std::move(enumerateDevicesPromises),
std::move(exposedDevices));
}
},
[](RefPtr<MediaMgrError>&&) {
MOZ_ASSERT_UNREACHABLE("GetPhysicalDevices does not reject");
});
mHaveUnprocessedDeviceListChange = false;
}
RefPtr<MediaDeviceSetRefCnt> MediaDevices::FilterExposedDevices(
const MediaDeviceSet& aDevices) const {
nsPIDOMWindowInner* window = GetOwner();
RefPtr exposed = new MediaDeviceSetRefCnt();
if (!window) {
return exposed; // Promises will be left pending
}
Document* doc = window->GetExtantDoc();
if (!doc) {
return exposed;
}
// Only expose devices which are allowed to use:
// https://w3c.github.io/mediacapture-main/#dom-mediadevices-enumeratedevices
bool dropMics = !FeaturePolicyUtils::IsFeatureAllowed(doc, u"microphone"_ns);
bool dropCams = !FeaturePolicyUtils::IsFeatureAllowed(doc, u"camera"_ns);
bool dropSpeakers =
!Preferences::GetBool("media.setsinkid.enabled") ||
!FeaturePolicyUtils::IsFeatureAllowed(doc, u"speaker-selection"_ns);
if (doc->ShouldResistFingerprinting(RFPTarget::MediaDevices)) {
RefPtr fakeEngine = new MediaEngineFake();
fakeEngine->EnumerateDevices(MediaSourceEnum::Microphone,
MediaSinkEnum::Other, exposed);
fakeEngine->EnumerateDevices(MediaSourceEnum::Camera, MediaSinkEnum::Other,
exposed);
dropMics = dropCams = true;
// Speakers are not handled specially with resistFingerprinting because
// they are exposed only when explicitly and individually allowed by the
// user.
}
bool legacy = StaticPrefs::media_devices_enumerate_legacy_enabled();
bool outputIsDefault = true; // First output is the default.
bool haveDefaultOutput = false;
nsTHashSet<nsString> exposedMicrophoneGroupIds;
for (const auto& device : aDevices) {
switch (device->mKind) {
case MediaDeviceKind::Audioinput:
if (dropMics) {
continue;
}
if (mCanExposeMicrophoneInfo) {
exposedMicrophoneGroupIds.Insert(device->mRawGroupID);
}
if (!mCanExposeMicrophoneInfo && !legacy) {
dropMics = true;
}
break;
case MediaDeviceKind::Videoinput:
if (dropCams) {
continue;
}
if (!mCanExposeCameraInfo && !legacy) {
dropCams = true;
}
break;
case MediaDeviceKind::Audiooutput:
if (dropSpeakers ||
(!mExplicitlyGrantedAudioOutputRawIds.Contains(device->mRawID) &&
// Assumes aDevices order has microphones before speakers.
!exposedMicrophoneGroupIds.Contains(device->mRawGroupID))) {
outputIsDefault = false;
continue;
}
if (!haveDefaultOutput && !outputIsDefault) {
// Insert a virtual default device so that the first enumerated
// device is the default output.
if (mDefaultOutputLabel.IsVoid()) {
mDefaultOutputLabel.SetIsVoid(false);
AutoTArray<nsCString, 1> resourceIds{"dom/media.ftl"_ns};
RefPtr l10n = Localization::Create(resourceIds, /*sync*/ true);
nsAutoCString translation;
IgnoredErrorResult rv;
l10n->FormatValueSync("default-audio-output-device-label"_ns, {},
translation, rv);
if (!rv.Failed()) {
AppendUTF8toUTF16(translation, mDefaultOutputLabel);
}
}
RefPtr info = new AudioDeviceInfo(
nullptr, mDefaultOutputLabel, u""_ns, u""_ns,
CUBEB_DEVICE_TYPE_OUTPUT, CUBEB_DEVICE_STATE_ENABLED,
CUBEB_DEVICE_PREF_ALL, CUBEB_DEVICE_FMT_ALL,
CUBEB_DEVICE_FMT_S16NE, 2, 44100, 44100, 44100, 128, 128);
exposed->AppendElement(
new MediaDevice(new MediaEngineFake(), info, u""_ns));
}
haveDefaultOutput = true;
break;
case MediaDeviceKind::EndGuard_:
continue;
// Avoid `default:` so that `-Wswitch` catches missing
// enumerators at compile time.
}
exposed->AppendElement(device);
}
return exposed;
}
bool MediaDevices::CanExposeInfo(MediaDeviceKind aKind) const {
switch (aKind) {
case MediaDeviceKind::Audioinput:
return mCanExposeMicrophoneInfo;
case MediaDeviceKind::Videoinput:
return mCanExposeCameraInfo;
case MediaDeviceKind::Audiooutput:
// Assumes caller has used FilterExposedDevices()
return true;
case MediaDeviceKind::EndGuard_:
break;
// Avoid `default:` so that `-Wswitch` catches missing enumerators at
// compile time.
}
MOZ_ASSERT_UNREACHABLE("unexpected MediaDeviceKind");
return false;
}
bool MediaDevices::ShouldQueueDeviceChange(
const MediaDeviceSet& aExposedDevices) const {
if (!mLastPhysicalDevices) { // SetupDeviceChangeListener not complete
return false;
}
RefPtr<MediaDeviceSetRefCnt> lastExposedDevices =
FilterExposedDevices(*mLastPhysicalDevices);
auto exposed = aExposedDevices.begin();
auto exposedEnd = aExposedDevices.end();
auto last = lastExposedDevices->begin();
auto lastEnd = lastExposedDevices->end();
// Lists from FilterExposedDevices may have multiple devices of the same
// kind even when only a single anonymous device of that kind should be
// exposed by enumerateDevices() (but multiple devices are currently exposed
// - bug 1528042). "devicechange" events are not queued when the number
// of such devices changes but remains non-zero.
while (exposed < exposedEnd && last < lastEnd) {
// First determine whether there is at least one device of the same kind
// in both `aExposedDevices` and `lastExposedDevices`.
// A change between zero and non-zero numbers of microphone or camera
// devices triggers a devicechange event even if that kind of device is
// not yet exposed.
MediaDeviceKind kind = (*exposed)->mKind;
if (kind != (*last)->mKind) {
return true;
}
// `exposed` and `last` have matching kind.
if (CanExposeInfo(kind)) {
// Queue "devicechange" if there has been any change in devices of this
// exposed kind. ID and kind uniquely identify a device.
if ((*exposed)->mRawID != (*last)->mRawID) {
return true;
}
++exposed;
++last;
continue;
}
// `aExposedDevices` and `lastExposedDevices` both have non-zero numbers
// of devices of this unexposed kind.
// Skip remaining devices of this kind because all devices of this kind
// should be exposed as a single anonymous device.
do {
++exposed;
} while (exposed != exposedEnd && (*exposed)->mKind == kind);
do {
++last;
} while (last != lastEnd && (*last)->mKind == kind);
}
// Queue "devicechange" if the number of exposed devices differs.
return exposed < exposedEnd || last < lastEnd;
}
void MediaDevices::ResumeEnumerateDevices(
nsTArray<RefPtr<Promise>>&& aPromises,
RefPtr<const MediaDeviceSetRefCnt> aExposedDevices) const {
nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();
if (!window) {
return; // Leave Promise pending after navigation by design.
}
MediaManager::Get()
->AnonymizeDevices(window, std::move(aExposedDevices))
->Then(GetCurrentSerialEventTarget(), __func__,
[self = RefPtr(this), this, promises = std::move(aPromises)](
const LocalDeviceSetPromise::ResolveOrRejectValue&
aLocalDevices) {
nsPIDOMWindowInner* window = GetWindowIfCurrent();
if (!window) {
return; // Leave Promises pending after navigation by design.
}
for (const RefPtr<Promise>& promise : promises) {
if (aLocalDevices.IsReject()) {
aLocalDevices.RejectValue()->Reject(promise);
} else {
ResolveEnumerateDevicesPromise(
promise, *aLocalDevices.ResolveValue());
}
}
});
}
void MediaDevices::ResolveEnumerateDevicesPromise(
Promise* aPromise, const LocalMediaDeviceSet& aDevices) const {
nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();
auto windowId = window->WindowID();
nsTArray<RefPtr<MediaDeviceInfo>> infos;
bool legacy = StaticPrefs::media_devices_enumerate_legacy_enabled();
bool capturePermitted =
legacy &&
MediaManager::Get()->IsActivelyCapturingOrHasAPermission(windowId);
for (const RefPtr<LocalMediaDevice>& device : aDevices) {
bool exposeInfo = CanExposeInfo(device->Kind()) || legacy;
bool exposeLabel = legacy ? capturePermitted : exposeInfo;
infos.AppendElement(MakeRefPtr<MediaDeviceInfo>(
exposeInfo ? device->mID : u""_ns, device->Kind(),
exposeLabel ? device->mName : u""_ns,
exposeInfo ? device->mGroupID : u""_ns));
}
aPromise->MaybeResolve(std::move(infos));
}
already_AddRefed<Promise> MediaDevices::GetDisplayMedia(
const DisplayMediaStreamConstraints& aConstraints, CallerType aCallerType,
ErrorResult& aRv) {
nsCOMPtr<nsIGlobalObject> global = xpc::NativeGlobal(GetWrapper());
RefPtr<Promise> p = Promise::Create(global, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
nsCOMPtr<nsPIDOMWindowInner> owner = do_QueryInterface(global);
/* If the relevant global object of this does not have transient activation,
* return a promise rejected with a DOMException object whose name attribute
* has the value InvalidStateError. */
WindowContext* wc = owner->GetWindowContext();
if (!wc || !wc->HasValidTransientUserGestureActivation()) {
p->MaybeRejectWithInvalidStateError(
"getDisplayMedia requires transient activation from a user gesture.");
return p.forget();
}
/* If constraints.video is false, return a promise rejected with a newly
* created TypeError. */
if (!MediaManager::IsOn(aConstraints.mVideo)) {
p->MaybeRejectWithTypeError("video is required");
return p.forget();
}
MediaStreamConstraints c;
auto& vc = c.mVideo.SetAsMediaTrackConstraints();
if (aConstraints.mVideo.IsMediaTrackConstraints()) {
vc = aConstraints.mVideo.GetAsMediaTrackConstraints();
/* If CS contains a member named advanced, return a promise rejected with
* a newly created TypeError. */
if (vc.mAdvanced.WasPassed()) {
p->MaybeRejectWithTypeError("advanced not allowed");
return p.forget();
}
auto getCLR = [](const auto& aCon) -> const ConstrainLongRange& {
static ConstrainLongRange empty;
return (aCon.WasPassed() && !aCon.Value().IsLong())
? aCon.Value().GetAsConstrainLongRange()
: empty;
};
auto getCDR = [](auto&& aCon) -> const ConstrainDoubleRange& {
static ConstrainDoubleRange empty;
return (aCon.WasPassed() && !aCon.Value().IsDouble())
? aCon.Value().GetAsConstrainDoubleRange()
: empty;
};
const auto& w = getCLR(vc.mWidth);
const auto& h = getCLR(vc.mHeight);
const auto& f = getCDR(vc.mFrameRate);
/* If CS contains a member whose name specifies a constrainable property
* applicable to display surfaces, and whose value in turn is a dictionary
* containing a member named either min or exact, return a promise
* rejected with a newly created TypeError. */
if (w.mMin.WasPassed() || h.mMin.WasPassed() || f.mMin.WasPassed()) {
p->MaybeRejectWithTypeError("min not allowed");
return p.forget();
}
if (w.mExact.WasPassed() || h.mExact.WasPassed() || f.mExact.WasPassed()) {
p->MaybeRejectWithTypeError("exact not allowed");
return p.forget();
}
/* If CS contains a member whose name, failedConstraint specifies a
* constrainable property, constraint, applicable to display surfaces, and
* whose value in turn is a dictionary containing a member named max, and
* that member's value in turn is less than the constrainable property's
* floor value, then let failedConstraint be the name of the constraint,
* let message be either undefined or an informative human-readable
* message, and return a promise rejected with a new OverconstrainedError
* created by calling OverconstrainedError(failedConstraint, message). */
// We fail early without incurring a prompt, on known-to-fail constraint
// values that don't reveal anything about the user's system.
const char* badConstraint = nullptr;
if (w.mMax.WasPassed() && w.mMax.Value() < 1) {
badConstraint = "width";
}
if (h.mMax.WasPassed() && h.mMax.Value() < 1) {
badConstraint = "height";
}
if (f.mMax.WasPassed() && f.mMax.Value() < 1) {
badConstraint = "frameRate";
}
if (badConstraint) {
p->MaybeReject(MakeRefPtr<dom::MediaStreamError>(
owner, *MakeRefPtr<MediaMgrError>(
MediaMgrError::Name::OverconstrainedError, "",
NS_ConvertASCIItoUTF16(badConstraint))));
return p.forget();
}
}
/* If the relevant settings object's responsible document is NOT fully
* active, return a promise rejected with a DOMException object whose name
* attribute has the value "InvalidStateError". */
if (!owner->IsFullyActive()) {
p->MaybeRejectWithInvalidStateError("The document is not fully active.");
return p.forget();
}
// We ask for "screen" sharing.
//
// If this is a privileged call or permission is disabled, this gives us full
// screen sharing by default, which is useful for internal testing.
//
// If this is a non-priviliged call, GetUserMedia() will change it to "window"
// for us.
vc.mMediaSource.Reset();
vc.mMediaSource.Construct().AssignASCII(
dom::MediaSourceEnumValues::GetString(MediaSourceEnum::Screen));
RefPtr<MediaDevices> self(this);
MediaManager::Get()
->GetUserMedia(owner, c, aCallerType)
->Then(
GetCurrentSerialEventTarget(), __func__,
[this, self, p](RefPtr<DOMMediaStream>&& aStream) {
if (!GetWindowIfCurrent()) {
return; // leave promise pending after navigation.
}
p->MaybeResolve(std::move(aStream));
},
[this, self, p](RefPtr<MediaMgrError>&& error) {
nsPIDOMWindowInner* window = GetWindowIfCurrent();
if (!window) {
return; // leave promise pending after navigation.
}
error->Reject(p);
});
return p.forget();
}
already_AddRefed<Promise> MediaDevices::SelectAudioOutput(
const AudioOutputOptions& aOptions, CallerType aCallerType,
ErrorResult& aRv) {
nsCOMPtr<nsIGlobalObject> global = xpc::NativeGlobal(GetWrapper());
RefPtr<Promise> p = Promise::Create(global, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
/* (This includes the expected user activation update of
* https://github.com/w3c/mediacapture-output/issues/107)
* If the relevant global object of this does not have transient activation,
* return a promise rejected with a DOMException object whose name attribute
* has the value InvalidStateError. */
nsCOMPtr<nsPIDOMWindowInner> owner = do_QueryInterface(global);
WindowContext* wc = owner->GetWindowContext();
if (!wc || !wc->HasValidTransientUserGestureActivation()) {
p->MaybeRejectWithInvalidStateError(
"selectAudioOutput requires transient user activation.");
return p.forget();
}
RefPtr<MediaDevices> self(this);
MediaManager::Get()
->SelectAudioOutput(owner, aOptions, aCallerType)
->Then(
GetCurrentSerialEventTarget(), __func__,
[this, self, p](RefPtr<LocalMediaDevice> aDevice) {
nsPIDOMWindowInner* window = GetWindowIfCurrent();
if (!window) {
return; // Leave Promise pending after navigation by design.
}
MOZ_ASSERT(aDevice->Kind() == dom::MediaDeviceKind::Audiooutput);
mExplicitlyGrantedAudioOutputRawIds.Insert(aDevice->RawID());
p->MaybeResolve(
MakeRefPtr<MediaDeviceInfo>(aDevice->mID, aDevice->Kind(),
aDevice->mName, aDevice->mGroupID));
},
[this, self, p](const RefPtr<MediaMgrError>& error) {
nsPIDOMWindowInner* window = GetWindowIfCurrent();
if (!window) {
return; // Leave Promise pending after navigation by design.
}
error->Reject(p);
});
return p.forget();
}
static RefPtr<AudioDeviceInfo> CopyWithNullDeviceId(
AudioDeviceInfo* aDeviceInfo) {
MOZ_ASSERT(aDeviceInfo->Preferred());
nsString vendor;
aDeviceInfo->GetVendor(vendor);
uint16_t type;
aDeviceInfo->GetType(&type);
uint16_t state;
aDeviceInfo->GetState(&state);
uint16_t pref;
aDeviceInfo->GetPreferred(&pref);
uint16_t supportedFormat;
aDeviceInfo->GetSupportedFormat(&supportedFormat);
uint16_t defaultFormat;
aDeviceInfo->GetDefaultFormat(&defaultFormat);
uint32_t maxChannels;
aDeviceInfo->GetMaxChannels(&maxChannels);
uint32_t defaultRate;
aDeviceInfo->GetDefaultRate(&defaultRate);
uint32_t maxRate;
aDeviceInfo->GetMaxRate(&maxRate);
uint32_t minRate;
aDeviceInfo->GetMinRate(&minRate);
uint32_t maxLatency;
aDeviceInfo->GetMaxLatency(&maxLatency);
uint32_t minLatency;
aDeviceInfo->GetMinLatency(&minLatency);
return MakeRefPtr<AudioDeviceInfo>(
nullptr, aDeviceInfo->Name(), aDeviceInfo->GroupID(), vendor, type, state,
pref, supportedFormat, defaultFormat, maxChannels, defaultRate, maxRate,
minRate, maxLatency, minLatency);
}
RefPtr<MediaDevices::SinkInfoPromise> MediaDevices::GetSinkDevice(
const nsString& aDeviceId) {
MOZ_ASSERT(NS_IsMainThread());
return MediaManager::Get()
->GetPhysicalDevices()
->Then(
GetCurrentSerialEventTarget(), __func__,
[self = RefPtr(this), this,
aDeviceId](RefPtr<const MediaDeviceSetRefCnt> aRawDevices) {
nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();
if (!window) {
return LocalDeviceSetPromise::CreateAndReject(
new MediaMgrError(MediaMgrError::Name::AbortError), __func__);
}
// Don't filter if matching the preferred device, because that may
// not be exposed.
RefPtr devices = aDeviceId.IsEmpty()
? std::move(aRawDevices)
: FilterExposedDevices(*aRawDevices);
return MediaManager::Get()->AnonymizeDevices(window,
std::move(devices));
},
[](RefPtr<MediaMgrError>&& reason) {
MOZ_ASSERT_UNREACHABLE("GetPhysicalDevices does not reject");
return RefPtr<LocalDeviceSetPromise>();
})
->Then(
GetCurrentSerialEventTarget(), __func__,
[aDeviceId](RefPtr<LocalMediaDeviceSetRefCnt> aDevices) {
RefPtr<AudioDeviceInfo> outputInfo;
// Check for a matching device.
for (const RefPtr<LocalMediaDevice>& device : *aDevices) {
if (device->Kind() != dom::MediaDeviceKind::Audiooutput) {
continue;
}
if (aDeviceId.IsEmpty()) {
MOZ_ASSERT(device->GetAudioDeviceInfo()->Preferred(),
"First Audiooutput should be preferred");
return SinkInfoPromise::CreateAndResolve(
CopyWithNullDeviceId(device->GetAudioDeviceInfo()),
__func__);
} else if (aDeviceId.Equals(device->mID)) {
return SinkInfoPromise::CreateAndResolve(
device->GetAudioDeviceInfo(), __func__);
}
}
/* If sinkId is not the empty string and does not match any audio
* output device identified by the result that would be provided
* by enumerateDevices(), reject p with a new DOMException whose
* name is NotFoundError and abort these substeps. */
return SinkInfoPromise::CreateAndReject(NS_ERROR_NOT_AVAILABLE,
__func__);
},
// aRejectMethod =
[](RefPtr<MediaMgrError>&& aError) {
return SinkInfoPromise::CreateAndReject(NS_ERROR_NOT_AVAILABLE,
__func__);
});
}
NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(MediaDevices,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_INHERITED(MediaDevices, DOMEventTargetHelper,
mPendingEnumerateDevicesPromises)
void MediaDevices::OnDeviceChange() {
MOZ_ASSERT(NS_IsMainThread());
if (NS_FAILED(CheckCurrentGlobalCorrectness())) {
// This is a ghost window, don't do anything.
return;
}
// Do not fire event to content script when
// privacy.resistFingerprinting is true.
if (nsContentUtils::ShouldResistFingerprinting(
"Guarding the more expensive RFP check with a simple one",
RFPTarget::MediaDevices)) {
nsCOMPtr<nsPIDOMWindowInner> window = GetOwner();
auto* wrapper = GetWrapper();
if (!window && wrapper) {
nsCOMPtr<nsIGlobalObject> global = xpc::NativeGlobal(wrapper);
window = do_QueryInterface(global);
}
if (!window) {
return;
}
if (nsGlobalWindowInner::Cast(window)->ShouldResistFingerprinting(
RFPTarget::MediaDevices)) {
return;
}
}
mHaveUnprocessedDeviceListChange = true;
MaybeResumeDeviceExposure();
}
mozilla::dom::EventHandlerNonNull* MediaDevices::GetOndevicechange() {
return GetEventHandler(nsGkAtoms::ondevicechange);
}
void MediaDevices::SetupDeviceChangeListener() {
if (mIsDeviceChangeListenerSetUp) {
return;
}
nsPIDOMWindowInner* window = GetOwner();
if (!window) {
return;
}
mDeviceChangeListener = MediaManager::Get()->DeviceListChangeEvent().Connect(
GetMainThreadSerialEventTarget(), this, &MediaDevices::OnDeviceChange);
mIsDeviceChangeListenerSetUp = true;
MediaManager::Get()->GetPhysicalDevices()->Then(
GetCurrentSerialEventTarget(), __func__,
[self = RefPtr(this), this](RefPtr<const MediaDeviceSetRefCnt> aDevices) {
mLastPhysicalDevices = std::move(aDevices);
},
[](RefPtr<MediaMgrError>&& reason) {
MOZ_ASSERT_UNREACHABLE("GetPhysicalDevices does not reject");
});
}
void MediaDevices::SetOndevicechange(
mozilla::dom::EventHandlerNonNull* aCallback) {
SetEventHandler(nsGkAtoms::ondevicechange, aCallback);
}
void MediaDevices::EventListenerAdded(nsAtom* aType) {
DOMEventTargetHelper::EventListenerAdded(aType);
SetupDeviceChangeListener();
}
JSObject* MediaDevices::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return MediaDevices_Binding::Wrap(aCx, this, aGivenProto);
}
} // namespace mozilla::dom
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