diff options
Diffstat (limited to 'dom/media/mediacapabilities/MediaCapabilities.cpp')
| -rw-r--r-- | dom/media/mediacapabilities/MediaCapabilities.cpp | 658 |
1 files changed, 658 insertions, 0 deletions
diff --git a/dom/media/mediacapabilities/MediaCapabilities.cpp b/dom/media/mediacapabilities/MediaCapabilities.cpp new file mode 100644 index 0000000000..904e9f4f54 --- /dev/null +++ b/dom/media/mediacapabilities/MediaCapabilities.cpp @@ -0,0 +1,658 @@ +/* -*- Mode: C++; tab-width: 8; 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, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "MediaCapabilities.h" + +#include <inttypes.h> + +#include <utility> + +#include "AllocationPolicy.h" +#include "Benchmark.h" +#include "DecoderBenchmark.h" +#include "DecoderTraits.h" +#include "MediaInfo.h" +#include "MediaRecorder.h" +#include "PDMFactory.h" +#include "VPXDecoder.h" +#include "mozilla/ClearOnShutdown.h" +#include "mozilla/SchedulerGroup.h" +#include "mozilla/StaticPrefs_media.h" +#include "mozilla/TaskQueue.h" +#include "mozilla/dom/Document.h" +#include "mozilla/dom/DOMMozPromiseRequestHolder.h" +#include "mozilla/dom/MediaCapabilitiesBinding.h" +#include "mozilla/dom/MediaSource.h" +#include "mozilla/dom/Promise.h" +#include "mozilla/dom/WorkerPrivate.h" +#include "mozilla/dom/WorkerRef.h" +#include "mozilla/layers/KnowsCompositor.h" +#include "nsContentUtils.h" +#include "WindowRenderer.h" + +static mozilla::LazyLogModule sMediaCapabilitiesLog("MediaCapabilities"); + +#define LOG(msg, ...) \ + DDMOZ_LOG(sMediaCapabilitiesLog, LogLevel::Debug, msg, ##__VA_ARGS__) + +namespace mozilla::dom { + +static nsCString VideoConfigurationToStr(const VideoConfiguration* aConfig) { + if (!aConfig) { + return nsCString(); + } + + nsCString hdrMetaType( + aConfig->mHdrMetadataType.WasPassed() + ? HdrMetadataTypeValues::GetString(aConfig->mHdrMetadataType.Value()) + : "?"); + + nsCString colorGamut( + aConfig->mColorGamut.WasPassed() + ? ColorGamutValues::GetString(aConfig->mColorGamut.Value()) + : "?"); + + nsCString transferFunction(aConfig->mTransferFunction.WasPassed() + ? TransferFunctionValues::GetString( + aConfig->mTransferFunction.Value()) + : "?"); + + auto str = nsPrintfCString( + "[contentType:%s width:%d height:%d bitrate:%" PRIu64 + " framerate:%lf hasAlphaChannel:%s hdrMetadataType:%s colorGamut:%s " + "transferFunction:%s scalabilityMode:%s]", + NS_ConvertUTF16toUTF8(aConfig->mContentType).get(), aConfig->mWidth, + aConfig->mHeight, aConfig->mBitrate, aConfig->mFramerate, + aConfig->mHasAlphaChannel.WasPassed() + ? aConfig->mHasAlphaChannel.Value() ? "true" : "false" + : "?", + hdrMetaType.get(), colorGamut.get(), transferFunction.get(), + aConfig->mScalabilityMode.WasPassed() + ? NS_ConvertUTF16toUTF8(aConfig->mScalabilityMode.Value()).get() + : "?"); + return std::move(str); +} + +static nsCString AudioConfigurationToStr(const AudioConfiguration* aConfig) { + if (!aConfig) { + return nsCString(); + } + auto str = nsPrintfCString( + "[contentType:%s channels:%s bitrate:%" PRIu64 " samplerate:%d]", + NS_ConvertUTF16toUTF8(aConfig->mContentType).get(), + aConfig->mChannels.WasPassed() + ? NS_ConvertUTF16toUTF8(aConfig->mChannels.Value()).get() + : "?", + aConfig->mBitrate.WasPassed() ? aConfig->mBitrate.Value() : 0, + aConfig->mSamplerate.WasPassed() ? aConfig->mSamplerate.Value() : 0); + return std::move(str); +} + +static nsCString MediaCapabilitiesInfoToStr( + const MediaCapabilitiesInfo* aInfo) { + if (!aInfo) { + return nsCString(); + } + auto str = nsPrintfCString("[supported:%s smooth:%s powerEfficient:%s]", + aInfo->Supported() ? "true" : "false", + aInfo->Smooth() ? "true" : "false", + aInfo->PowerEfficient() ? "true" : "false"); + return std::move(str); +} + +static nsCString MediaDecodingConfigurationToStr( + const MediaDecodingConfiguration& aConfig) { + nsCString str; + str += "["_ns; + if (aConfig.mVideo.WasPassed()) { + str += "video:"_ns + VideoConfigurationToStr(&aConfig.mVideo.Value()); + if (aConfig.mAudio.WasPassed()) { + str += " "_ns; + } + } + if (aConfig.mAudio.WasPassed()) { + str += "audio:"_ns + AudioConfigurationToStr(&aConfig.mAudio.Value()); + } + str += "]"_ns; + return str; +} + +MediaCapabilities::MediaCapabilities(nsIGlobalObject* aParent) + : mParent(aParent) {} + +already_AddRefed<Promise> MediaCapabilities::DecodingInfo( + const MediaDecodingConfiguration& aConfiguration, ErrorResult& aRv) { + RefPtr<Promise> promise = Promise::Create(mParent, aRv); + if (aRv.Failed()) { + return nullptr; + } + + // If configuration is not a valid MediaConfiguration, return a Promise + // rejected with a TypeError. + if (!aConfiguration.mVideo.WasPassed() && + !aConfiguration.mAudio.WasPassed()) { + aRv.ThrowTypeError<MSG_MISSING_REQUIRED_DICTIONARY_MEMBER>( + "'audio' or 'video' member of argument of " + "MediaCapabilities.decodingInfo"); + return nullptr; + } + + LOG("Processing %s", MediaDecodingConfigurationToStr(aConfiguration).get()); + + bool supported = true; + Maybe<MediaContainerType> videoContainer; + Maybe<MediaContainerType> audioContainer; + + // If configuration.video is present and is not a valid video configuration, + // return a Promise rejected with a TypeError. + if (aConfiguration.mVideo.WasPassed()) { + videoContainer = CheckVideoConfiguration(aConfiguration.mVideo.Value()); + if (!videoContainer) { + aRv.ThrowTypeError<MSG_INVALID_MEDIA_VIDEO_CONFIGURATION>(); + return nullptr; + } + + // We have a video configuration and it is valid. Check if it is supported. + supported &= + aConfiguration.mType == MediaDecodingType::File + ? CheckTypeForFile(aConfiguration.mVideo.Value().mContentType) + : CheckTypeForMediaSource( + aConfiguration.mVideo.Value().mContentType); + } + if (aConfiguration.mAudio.WasPassed()) { + audioContainer = CheckAudioConfiguration(aConfiguration.mAudio.Value()); + if (!audioContainer) { + aRv.ThrowTypeError<MSG_INVALID_MEDIA_AUDIO_CONFIGURATION>(); + return nullptr; + } + // We have an audio configuration and it is valid. Check if it is supported. + supported &= + aConfiguration.mType == MediaDecodingType::File + ? CheckTypeForFile(aConfiguration.mAudio.Value().mContentType) + : CheckTypeForMediaSource( + aConfiguration.mAudio.Value().mContentType); + } + + if (!supported) { + auto info = MakeUnique<MediaCapabilitiesInfo>( + false /* supported */, false /* smooth */, false /* power efficient */); + LOG("%s -> %s", MediaDecodingConfigurationToStr(aConfiguration).get(), + MediaCapabilitiesInfoToStr(info.get()).get()); + promise->MaybeResolve(std::move(info)); + return promise.forget(); + } + + nsTArray<UniquePtr<TrackInfo>> tracks; + if (aConfiguration.mVideo.WasPassed()) { + MOZ_ASSERT(videoContainer.isSome(), "configuration is valid and supported"); + auto videoTracks = DecoderTraits::GetTracksInfo(*videoContainer); + // If the MIME type does not imply a codec, the string MUST + // also have one and only one parameter that is named codecs with a value + // describing a single media codec. Otherwise, it MUST contain no + // parameters. + if (videoTracks.Length() != 1) { + promise->MaybeRejectWithTypeError<MSG_NO_CODECS_PARAMETER>( + videoContainer->OriginalString()); + return promise.forget(); + } + MOZ_DIAGNOSTIC_ASSERT(videoTracks.ElementAt(0), + "must contain a valid trackinfo"); + // If the type refers to an audio codec, reject now. + if (videoTracks[0]->GetType() != TrackInfo::kVideoTrack) { + promise + ->MaybeRejectWithTypeError<MSG_INVALID_MEDIA_VIDEO_CONFIGURATION>(); + return promise.forget(); + } + tracks.AppendElements(std::move(videoTracks)); + } + if (aConfiguration.mAudio.WasPassed()) { + MOZ_ASSERT(audioContainer.isSome(), "configuration is valid and supported"); + auto audioTracks = DecoderTraits::GetTracksInfo(*audioContainer); + // If the MIME type does not imply a codec, the string MUST + // also have one and only one parameter that is named codecs with a value + // describing a single media codec. Otherwise, it MUST contain no + // parameters. + if (audioTracks.Length() != 1) { + promise->MaybeRejectWithTypeError<MSG_NO_CODECS_PARAMETER>( + audioContainer->OriginalString()); + return promise.forget(); + } + MOZ_DIAGNOSTIC_ASSERT(audioTracks.ElementAt(0), + "must contain a valid trackinfo"); + // If the type refers to a video codec, reject now. + if (audioTracks[0]->GetType() != TrackInfo::kAudioTrack) { + promise + ->MaybeRejectWithTypeError<MSG_INVALID_MEDIA_AUDIO_CONFIGURATION>(); + return promise.forget(); + } + tracks.AppendElements(std::move(audioTracks)); + } + + using CapabilitiesPromise = MozPromise<MediaCapabilitiesInfo, MediaResult, + /* IsExclusive = */ true>; + nsTArray<RefPtr<CapabilitiesPromise>> promises; + + RefPtr<TaskQueue> taskQueue = + TaskQueue::Create(GetMediaThreadPool(MediaThreadType::PLATFORM_DECODER), + "MediaCapabilities::TaskQueue"); + for (auto&& config : tracks) { + TrackInfo::TrackType type = + config->IsVideo() ? TrackInfo::kVideoTrack : TrackInfo::kAudioTrack; + + MOZ_ASSERT(type == TrackInfo::kAudioTrack || + videoContainer->ExtendedType().GetFramerate().isSome(), + "framerate is a required member of VideoConfiguration"); + + if (type == TrackInfo::kAudioTrack) { + // There's no need to create an audio decoder has we only want to know if + // such codec is supported. We do need to call the PDMFactory::Supports + // API outside the main thread to get accurate results. + promises.AppendElement( + InvokeAsync(taskQueue, __func__, [config = std::move(config)]() { + RefPtr<PDMFactory> pdm = new PDMFactory(); + SupportDecoderParams params{*config}; + if (pdm->Supports(params, nullptr /* decoder doctor */) == + media::DecodeSupport::Unsupported) { + return CapabilitiesPromise::CreateAndReject(NS_ERROR_FAILURE, + __func__); + } + return CapabilitiesPromise::CreateAndResolve( + MediaCapabilitiesInfo(true /* supported */, true /* smooth */, + true /* power efficient */), + __func__); + })); + continue; + } + + // On Windows, the MediaDataDecoder expects to be created on a thread + // supporting MTA, which the main thread doesn't. So we use our task queue + // to create such decoder and perform initialization. + + RefPtr<layers::KnowsCompositor> compositor = GetCompositor(); + float frameRate = + static_cast<float>(videoContainer->ExtendedType().GetFramerate().ref()); + const bool shouldResistFingerprinting = + mParent->ShouldResistFingerprinting(RFPTarget::Unknown); + + // clang-format off + promises.AppendElement(InvokeAsync( + taskQueue, __func__, + [taskQueue, frameRate, shouldResistFingerprinting, compositor, + config = std::move(config)]() mutable -> RefPtr<CapabilitiesPromise> { + // MediaDataDecoder keeps a reference to the config object, so we must + // keep it alive until the decoder has been shutdown. + static Atomic<uint32_t> sTrackingIdCounter(0); + TrackingId trackingId(TrackingId::Source::MediaCapabilities, + sTrackingIdCounter++, + TrackingId::TrackAcrossProcesses::Yes); + CreateDecoderParams params{ + *config, compositor, + CreateDecoderParams::VideoFrameRate(frameRate), + TrackInfo::kVideoTrack, Some(std::move(trackingId))}; + // We want to ensure that all decoder's queries are occurring only + // once at a time as it can quickly exhaust the system resources + // otherwise. + static RefPtr<AllocPolicy> sVideoAllocPolicy = [&taskQueue]() { + SchedulerGroup::Dispatch( + TaskCategory::Other, + NS_NewRunnableFunction( + "MediaCapabilities::AllocPolicy:Video", []() { + ClearOnShutdown(&sVideoAllocPolicy, + ShutdownPhase::XPCOMShutdownThreads); + })); + return new SingleAllocPolicy(TrackInfo::TrackType::kVideoTrack, + taskQueue); + }(); + return AllocationWrapper::CreateDecoder(params, sVideoAllocPolicy) + ->Then( + taskQueue, __func__, + [taskQueue, frameRate, shouldResistFingerprinting, + config = std::move(config)]( + AllocationWrapper::AllocateDecoderPromise:: + ResolveOrRejectValue&& aValue) mutable { + if (aValue.IsReject()) { + return CapabilitiesPromise::CreateAndReject( + std::move(aValue.RejectValue()), __func__); + } + RefPtr<MediaDataDecoder> decoder = + std::move(aValue.ResolveValue()); + // We now query the decoder to determine if it's power + // efficient. + RefPtr<CapabilitiesPromise> p = decoder->Init()->Then( + taskQueue, __func__, + [taskQueue, decoder, frameRate, + shouldResistFingerprinting, + config = std::move(config)]( + MediaDataDecoder::InitPromise:: + ResolveOrRejectValue&& aValue) mutable { + RefPtr<CapabilitiesPromise> p; + if (aValue.IsReject()) { + p = CapabilitiesPromise::CreateAndReject( + std::move(aValue.RejectValue()), __func__); + } else if (shouldResistFingerprinting) { + p = CapabilitiesPromise::CreateAndResolve( + MediaCapabilitiesInfo(true /* supported */, + true /* smooth */, false /* power efficient */), + __func__); + } else { + MOZ_ASSERT(config->IsVideo()); + if (StaticPrefs::media_mediacapabilities_from_database()) { + nsAutoCString reason; + bool powerEfficient = + decoder->IsHardwareAccelerated(reason); + + int32_t videoFrameRate = std::clamp<int32_t>(frameRate, 1, INT32_MAX); + + DecoderBenchmarkInfo benchmarkInfo{ + config->mMimeType, + config->GetAsVideoInfo()->mImage.width, + config->GetAsVideoInfo()->mImage.height, + videoFrameRate, 8}; + + p = DecoderBenchmark::Get(benchmarkInfo)->Then( + GetMainThreadSerialEventTarget(), + __func__, + [powerEfficient](int32_t score) { + // score < 0 means no entry found. + bool smooth = score < 0 || score > + StaticPrefs:: + media_mediacapabilities_drop_threshold(); + return CapabilitiesPromise:: + CreateAndResolve( + MediaCapabilitiesInfo( + true, smooth, + powerEfficient), + __func__); + }, + [](nsresult rv) { + return CapabilitiesPromise:: + CreateAndReject(rv, __func__); + }); + } else if (config->GetAsVideoInfo()->mImage.height < 480) { + // Assume that we can do stuff at 480p or less in + // a power efficient manner and smoothly. If + // greater than 480p we assume that if the video + // decoding is hardware accelerated it will be + // smooth and power efficient, otherwise we use + // the benchmark to estimate + p = CapabilitiesPromise::CreateAndResolve( + MediaCapabilitiesInfo(true, true, true), + __func__); + } else { + nsAutoCString reason; + bool smooth = true; + bool powerEfficient = + decoder->IsHardwareAccelerated(reason); + if (!powerEfficient && + VPXDecoder::IsVP9(config->mMimeType)) { + smooth = VP9Benchmark::IsVP9DecodeFast( + true /* default */); + uint32_t fps = + VP9Benchmark::MediaBenchmarkVp9Fps(); + if (!smooth && fps > 0) { + // The VP9 estimizer decode a 1280x720 video. + // Let's adjust the result for the resolution + // and frame rate of what we actually want. If + // the result is twice that we need we assume + // it will be smooth. + const auto& videoConfig = + *config->GetAsVideoInfo(); + double needed = ((1280.0 * 720.0) / + (videoConfig.mImage.width * + videoConfig.mImage.height) * + fps) / + frameRate; + smooth = needed > 2; + } + } + + p = CapabilitiesPromise::CreateAndResolve( + MediaCapabilitiesInfo(true /* supported */, + smooth, powerEfficient), + __func__); + } + } + MOZ_ASSERT(p.get(), "the promise has been created"); + // Let's keep alive the decoder and the config object + // until the decoder has shutdown. + decoder->Shutdown()->Then( + taskQueue, __func__, + [taskQueue, decoder, config = std::move(config)]( + const ShutdownPromise::ResolveOrRejectValue& + aValue) {}); + return p; + }); + return p; + }); + })); + // clang-format on + } + + auto holder = MakeRefPtr< + DOMMozPromiseRequestHolder<CapabilitiesPromise::AllPromiseType>>(mParent); + RefPtr<nsISerialEventTarget> targetThread; + RefPtr<StrongWorkerRef> workerRef; + + if (NS_IsMainThread()) { + targetThread = mParent->AbstractMainThreadFor(TaskCategory::Other); + } else { + WorkerPrivate* wp = GetCurrentThreadWorkerPrivate(); + MOZ_ASSERT(wp, "Must be called from a worker thread"); + targetThread = wp->HybridEventTarget(); + workerRef = StrongWorkerRef::Create( + wp, "MediaCapabilities", [holder, targetThread]() { + MOZ_ASSERT(targetThread->IsOnCurrentThread()); + holder->DisconnectIfExists(); + }); + if (NS_WARN_IF(!workerRef)) { + // The worker is shutting down. + aRv.Throw(NS_ERROR_FAILURE); + return nullptr; + } + } + + MOZ_ASSERT(targetThread); + + // this is only captured for use with the LOG macro. + RefPtr<MediaCapabilities> self = this; + + CapabilitiesPromise::All(targetThread, promises) + ->Then(targetThread, __func__, + [promise, tracks = std::move(tracks), workerRef, holder, + aConfiguration, self, + this](CapabilitiesPromise::AllPromiseType::ResolveOrRejectValue&& + aValue) { + holder->Complete(); + if (aValue.IsReject()) { + auto info = MakeUnique<MediaCapabilitiesInfo>( + false /* supported */, false /* smooth */, + false /* power efficient */); + LOG("%s -> %s", + MediaDecodingConfigurationToStr(aConfiguration).get(), + MediaCapabilitiesInfoToStr(info.get()).get()); + promise->MaybeResolve(std::move(info)); + return; + } + bool powerEfficient = true; + bool smooth = true; + for (auto&& capability : aValue.ResolveValue()) { + smooth &= capability.Smooth(); + powerEfficient &= capability.PowerEfficient(); + } + auto info = MakeUnique<MediaCapabilitiesInfo>( + true /* supported */, smooth, powerEfficient); + LOG("%s -> %s", + MediaDecodingConfigurationToStr(aConfiguration).get(), + MediaCapabilitiesInfoToStr(info.get()).get()); + promise->MaybeResolve(std::move(info)); + }) + ->Track(*holder); + + return promise.forget(); +} + +already_AddRefed<Promise> MediaCapabilities::EncodingInfo( + const MediaEncodingConfiguration& aConfiguration, ErrorResult& aRv) { + RefPtr<Promise> promise = Promise::Create(mParent, aRv); + if (aRv.Failed()) { + return nullptr; + } + + // If configuration is not a valid MediaConfiguration, return a Promise + // rejected with a TypeError. + if (!aConfiguration.mVideo.WasPassed() && + !aConfiguration.mAudio.WasPassed()) { + aRv.ThrowTypeError<MSG_MISSING_REQUIRED_DICTIONARY_MEMBER>( + "'audio' or 'video' member of argument of " + "MediaCapabilities.encodingInfo"); + return nullptr; + } + + bool supported = true; + + // If configuration.video is present and is not a valid video configuration, + // return a Promise rejected with a TypeError. + if (aConfiguration.mVideo.WasPassed()) { + if (!CheckVideoConfiguration(aConfiguration.mVideo.Value())) { + aRv.ThrowTypeError<MSG_INVALID_MEDIA_VIDEO_CONFIGURATION>(); + return nullptr; + } + // We have a video configuration and it is valid. Check if it is supported. + supported &= + CheckTypeForEncoder(aConfiguration.mVideo.Value().mContentType); + } + if (aConfiguration.mAudio.WasPassed()) { + if (!CheckAudioConfiguration(aConfiguration.mAudio.Value())) { + aRv.ThrowTypeError<MSG_INVALID_MEDIA_AUDIO_CONFIGURATION>(); + return nullptr; + } + // We have an audio configuration and it is valid. Check if it is supported. + supported &= + CheckTypeForEncoder(aConfiguration.mAudio.Value().mContentType); + } + + auto info = MakeUnique<MediaCapabilitiesInfo>(supported, supported, false); + promise->MaybeResolve(std::move(info)); + + return promise.forget(); +} + +Maybe<MediaContainerType> MediaCapabilities::CheckVideoConfiguration( + const VideoConfiguration& aConfig) const { + Maybe<MediaExtendedMIMEType> container = MakeMediaExtendedMIMEType(aConfig); + if (!container) { + return Nothing(); + } + // A valid video MIME type is a string that is a valid media MIME type and for + // which the type per [RFC7231] is either video or application. + if (!container->Type().HasVideoMajorType() && + !container->Type().HasApplicationMajorType()) { + return Nothing(); + } + + // If the MIME type does not imply a codec, the string MUST also have one and + // only one parameter that is named codecs with a value describing a single + // media codec. Otherwise, it MUST contain no parameters. + // TODO (nsIMOMEHeaderParam doesn't provide backend to count number of + // parameters) + + return Some(MediaContainerType(std::move(*container))); +} + +Maybe<MediaContainerType> MediaCapabilities::CheckAudioConfiguration( + const AudioConfiguration& aConfig) const { + Maybe<MediaExtendedMIMEType> container = MakeMediaExtendedMIMEType(aConfig); + if (!container) { + return Nothing(); + } + // A valid audio MIME type is a string that is valid media MIME type and for + // which the type per [RFC7231] is either audio or application. + if (!container->Type().HasAudioMajorType() && + !container->Type().HasApplicationMajorType()) { + return Nothing(); + } + + // If the MIME type does not imply a codec, the string MUST also have one and + // only one parameter that is named codecs with a value describing a single + // media codec. Otherwise, it MUST contain no parameters. + // TODO (nsIMOMEHeaderParam doesn't provide backend to count number of + // parameters) + + return Some(MediaContainerType(std::move(*container))); +} + +bool MediaCapabilities::CheckTypeForMediaSource(const nsAString& aType) { + IgnoredErrorResult rv; + MediaSource::IsTypeSupported(aType, nullptr /* DecoderDoctorDiagnostics */, + rv); + + return !rv.Failed(); +} + +bool MediaCapabilities::CheckTypeForFile(const nsAString& aType) { + Maybe<MediaContainerType> containerType = MakeMediaContainerType(aType); + if (!containerType) { + return false; + } + + return DecoderTraits::CanHandleContainerType( + *containerType, nullptr /* DecoderDoctorDiagnostics */) != + CANPLAY_NO; +} + +bool MediaCapabilities::CheckTypeForEncoder(const nsAString& aType) { + return MediaRecorder::IsTypeSupported(aType); +} + +already_AddRefed<layers::KnowsCompositor> MediaCapabilities::GetCompositor() { + nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(GetParentObject()); + if (NS_WARN_IF(!window)) { + return nullptr; + } + + nsCOMPtr<Document> doc = window->GetExtantDoc(); + if (NS_WARN_IF(!doc)) { + return nullptr; + } + WindowRenderer* renderer = nsContentUtils::WindowRendererForDocument(doc); + if (NS_WARN_IF(!renderer)) { + return nullptr; + } + RefPtr<layers::KnowsCompositor> knows = renderer->AsKnowsCompositor(); + if (NS_WARN_IF(!knows)) { + return nullptr; + } + return knows->GetForMedia().forget(); +} + +bool MediaCapabilities::Enabled(JSContext* aCx, JSObject* aGlobal) { + return StaticPrefs::media_media_capabilities_enabled(); +} + +JSObject* MediaCapabilities::WrapObject(JSContext* aCx, + JS::Handle<JSObject*> aGivenProto) { + return MediaCapabilities_Binding::Wrap(aCx, this, aGivenProto); +} + +NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaCapabilities) + NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY + NS_INTERFACE_MAP_ENTRY(nsISupports) +NS_INTERFACE_MAP_END + +NS_IMPL_CYCLE_COLLECTING_ADDREF(MediaCapabilities) +NS_IMPL_CYCLE_COLLECTING_RELEASE(MediaCapabilities) + +NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(MediaCapabilities, mParent) + +// MediaCapabilitiesInfo +bool MediaCapabilitiesInfo::WrapObject( + JSContext* aCx, JS::Handle<JSObject*> aGivenProto, + JS::MutableHandle<JSObject*> aReflector) { + return MediaCapabilitiesInfo_Binding::Wrap(aCx, this, aGivenProto, + aReflector); +} + +} // namespace mozilla::dom |