diff options
Diffstat (limited to 'dom/media/webrtc/MediaEngineRemoteVideoSource.cpp')
| -rw-r--r-- | dom/media/webrtc/MediaEngineRemoteVideoSource.cpp | 907 |
1 files changed, 907 insertions, 0 deletions
diff --git a/dom/media/webrtc/MediaEngineRemoteVideoSource.cpp b/dom/media/webrtc/MediaEngineRemoteVideoSource.cpp new file mode 100644 index 0000000000..ce9f4ad9a8 --- /dev/null +++ b/dom/media/webrtc/MediaEngineRemoteVideoSource.cpp @@ -0,0 +1,907 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this file, + * You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#include "MediaEngineRemoteVideoSource.h" + +#include "CamerasChild.h" +#include "MediaManager.h" +#include "MediaTrackConstraints.h" +#include "mozilla/dom/MediaTrackSettingsBinding.h" +#include "mozilla/ErrorNames.h" +#include "mozilla/gfx/Point.h" +#include "mozilla/RefPtr.h" +#include "PerformanceRecorder.h" +#include "Tracing.h" +#include "VideoFrameUtils.h" +#include "VideoUtils.h" +#include "ImageContainer.h" +#include "common_video/include/video_frame_buffer.h" +#include "common_video/libyuv/include/webrtc_libyuv.h" + +namespace mozilla { + +extern LazyLogModule gMediaManagerLog; +#define LOG(...) MOZ_LOG(gMediaManagerLog, LogLevel::Debug, (__VA_ARGS__)) +#define LOG_FRAME(...) \ + MOZ_LOG(gMediaManagerLog, LogLevel::Verbose, (__VA_ARGS__)) + +using dom::ConstrainLongRange; +using dom::MediaSourceEnum; +using dom::MediaTrackConstraints; +using dom::MediaTrackConstraintSet; +using dom::MediaTrackSettings; +using dom::VideoFacingModeEnum; + +/* static */ +camera::CaptureEngine MediaEngineRemoteVideoSource::CaptureEngine( + MediaSourceEnum aMediaSource) { + switch (aMediaSource) { + case MediaSourceEnum::Browser: + return camera::BrowserEngine; + case MediaSourceEnum::Camera: + return camera::CameraEngine; + case MediaSourceEnum::Screen: + return camera::ScreenEngine; + case MediaSourceEnum::Window: + return camera::WinEngine; + default: + MOZ_CRASH(); + } +} + +static Maybe<VideoFacingModeEnum> GetFacingMode(const nsString& aDeviceName) { + // Set facing mode based on device name. +#if defined(ANDROID) + // Names are generated. Example: "Camera 0, Facing back, Orientation 90" + // + // See media/webrtc/trunk/webrtc/modules/video_capture/android/java/src/org/ + // webrtc/videoengine/VideoCaptureDeviceInfoAndroid.java + + if (aDeviceName.Find(u"Facing back"_ns) != kNotFound) { + return Some(VideoFacingModeEnum::Environment); + } + if (aDeviceName.Find(u"Facing front"_ns) != kNotFound) { + return Some(VideoFacingModeEnum::User); + } +#endif // ANDROID +#ifdef XP_MACOSX + // Kludge to test user-facing cameras on OSX. + if (aDeviceName.Find(u"Face"_ns) != -1) { + return Some(VideoFacingModeEnum::User); + } +#endif +#ifdef XP_WIN + // The cameras' name of Surface book are "Microsoft Camera Front" and + // "Microsoft Camera Rear" respectively. + + if (aDeviceName.Find(u"Front"_ns) != kNotFound) { + return Some(VideoFacingModeEnum::User); + } + if (aDeviceName.Find(u"Rear"_ns) != kNotFound) { + return Some(VideoFacingModeEnum::Environment); + } +#endif // WINDOWS + + return Nothing(); +} + +MediaEngineRemoteVideoSource::MediaEngineRemoteVideoSource( + const MediaDevice* aMediaDevice) + : mCapEngine(CaptureEngine(aMediaDevice->mMediaSource)), + mTrackingId(CaptureEngineToTrackingSourceStr(mCapEngine), 0), + mMutex("MediaEngineRemoteVideoSource::mMutex"), + mRescalingBufferPool(/* zero_initialize */ false, + /* max_number_of_buffers */ 1), + mSettingsUpdatedByFrame(MakeAndAddRef<media::Refcountable<AtomicBool>>()), + mSettings(MakeAndAddRef<media::Refcountable<MediaTrackSettings>>()), + mFirstFramePromise(mFirstFramePromiseHolder.Ensure(__func__)), + mMediaDevice(aMediaDevice), + mDeviceUUID(NS_ConvertUTF16toUTF8(aMediaDevice->mRawID)) { + LOG("%s", __PRETTY_FUNCTION__); + mSettings->mWidth.Construct(0); + mSettings->mHeight.Construct(0); + mSettings->mFrameRate.Construct(0); + if (mCapEngine == camera::CameraEngine) { + // Only cameras can have a facing mode. + Maybe<VideoFacingModeEnum> facingMode = + GetFacingMode(mMediaDevice->mRawName); + if (facingMode.isSome()) { + NS_ConvertASCIItoUTF16 facingString( + dom::VideoFacingModeEnumValues::GetString(*facingMode)); + mSettings->mFacingMode.Construct(facingString); + mFacingMode.emplace(facingString); + } + } +} + +MediaEngineRemoteVideoSource::~MediaEngineRemoteVideoSource() { + mFirstFramePromiseHolder.RejectIfExists(NS_ERROR_ABORT, __func__); +} + +nsresult MediaEngineRemoteVideoSource::Allocate( + const MediaTrackConstraints& aConstraints, const MediaEnginePrefs& aPrefs, + uint64_t aWindowID, const char** aOutBadConstraint) { + LOG("%s", __PRETTY_FUNCTION__); + AssertIsOnOwningThread(); + + MOZ_ASSERT(mState == kReleased); + + NormalizedConstraints constraints(aConstraints); + webrtc::CaptureCapability newCapability; + LOG("ChooseCapability(kFitness) for mCapability (Allocate) ++"); + if (!ChooseCapability(constraints, aPrefs, newCapability, kFitness)) { + *aOutBadConstraint = + MediaConstraintsHelper::FindBadConstraint(constraints, mMediaDevice); + return NS_ERROR_FAILURE; + } + LOG("ChooseCapability(kFitness) for mCapability (Allocate) --"); + + mCaptureId = + camera::GetChildAndCall(&camera::CamerasChild::AllocateCapture, + mCapEngine, mDeviceUUID.get(), aWindowID); + if (mCaptureId < 0) { + return NS_ERROR_FAILURE; + } + + { + MutexAutoLock lock(mMutex); + mState = kAllocated; + mCapability = newCapability; + mTrackingId = + TrackingId(CaptureEngineToTrackingSourceStr(mCapEngine), mCaptureId); + } + + LOG("Video device %d allocated", mCaptureId); + return NS_OK; +} + +nsresult MediaEngineRemoteVideoSource::Deallocate() { + LOG("%s", __PRETTY_FUNCTION__); + AssertIsOnOwningThread(); + + MOZ_ASSERT(mState == kStopped || mState == kAllocated); + + if (mTrack) { + mTrack->End(); + } + + { + MutexAutoLock lock(mMutex); + + mTrack = nullptr; + mPrincipal = PRINCIPAL_HANDLE_NONE; + mState = kReleased; + } + + // Stop() has stopped capture synchronously on the media thread before we get + // here, so there are no longer any callbacks on an IPC thread accessing + // mImageContainer or mRescalingBufferPool. + mImageContainer = nullptr; + mRescalingBufferPool.Release(); + + LOG("Video device %d deallocated", mCaptureId); + + if (camera::GetChildAndCall(&camera::CamerasChild::ReleaseCapture, mCapEngine, + mCaptureId)) { + // Failure can occur when the parent process is shutting down. + return NS_ERROR_FAILURE; + } + return NS_OK; +} + +void MediaEngineRemoteVideoSource::SetTrack(const RefPtr<MediaTrack>& aTrack, + const PrincipalHandle& aPrincipal) { + LOG("%s", __PRETTY_FUNCTION__); + AssertIsOnOwningThread(); + + MOZ_ASSERT(mState == kAllocated); + MOZ_ASSERT(!mTrack); + MOZ_ASSERT(aTrack); + MOZ_ASSERT(aTrack->AsSourceTrack()); + + if (!mImageContainer) { + mImageContainer = MakeAndAddRef<layers::ImageContainer>( + layers::ImageContainer::ASYNCHRONOUS); + } + + { + MutexAutoLock lock(mMutex); + mTrack = aTrack->AsSourceTrack(); + mPrincipal = aPrincipal; + } +} + +nsresult MediaEngineRemoteVideoSource::Start() { + LOG("%s", __PRETTY_FUNCTION__); + AssertIsOnOwningThread(); + + MOZ_ASSERT(mState == kAllocated || mState == kStopped); + MOZ_ASSERT(mTrack); + + { + MutexAutoLock lock(mMutex); + mState = kStarted; + } + + mSettingsUpdatedByFrame->mValue = false; + + if (camera::GetChildAndCall(&camera::CamerasChild::StartCapture, mCapEngine, + mCaptureId, mCapability, this)) { + LOG("StartCapture failed"); + MutexAutoLock lock(mMutex); + mState = kStopped; + return NS_ERROR_FAILURE; + } + + NS_DispatchToMainThread(NS_NewRunnableFunction( + "MediaEngineRemoteVideoSource::SetLastCapability", + [settings = mSettings, updated = mSettingsUpdatedByFrame, + capEngine = mCapEngine, cap = mCapability]() mutable { + switch (capEngine) { + case camera::ScreenEngine: + case camera::WinEngine: + // Undo the hack where ideal and max constraints are crammed + // together in mCapability for consumption by low-level code. We + // don't actually know the real resolution yet, so report min(ideal, + // max) for now. + // TODO: This can be removed in bug 1453269. + cap.width = std::min(cap.width >> 16, cap.width & 0xffff); + cap.height = std::min(cap.height >> 16, cap.height & 0xffff); + break; + default: + break; + } + + if (!updated->mValue) { + settings->mWidth.Value() = cap.width; + settings->mHeight.Value() = cap.height; + } + settings->mFrameRate.Value() = cap.maxFPS; + })); + + return NS_OK; +} + +nsresult MediaEngineRemoteVideoSource::FocusOnSelectedSource() { + LOG("%s", __PRETTY_FUNCTION__); + AssertIsOnOwningThread(); + + int result; + result = camera::GetChildAndCall(&camera::CamerasChild::FocusOnSelectedSource, + mCapEngine, mCaptureId); + return result == 0 ? NS_OK : NS_ERROR_FAILURE; +} + +nsresult MediaEngineRemoteVideoSource::Stop() { + LOG("%s", __PRETTY_FUNCTION__); + AssertIsOnOwningThread(); + + if (mState == kStopped || mState == kAllocated) { + return NS_OK; + } + + MOZ_ASSERT(mState == kStarted); + + if (camera::GetChildAndCall(&camera::CamerasChild::StopCapture, mCapEngine, + mCaptureId)) { + // Failure can occur when the parent process is shutting down. + return NS_ERROR_FAILURE; + } + + { + MutexAutoLock lock(mMutex); + mState = kStopped; + } + + return NS_OK; +} + +nsresult MediaEngineRemoteVideoSource::Reconfigure( + const MediaTrackConstraints& aConstraints, const MediaEnginePrefs& aPrefs, + const char** aOutBadConstraint) { + LOG("%s", __PRETTY_FUNCTION__); + AssertIsOnOwningThread(); + + NormalizedConstraints constraints(aConstraints); + webrtc::CaptureCapability newCapability; + LOG("ChooseCapability(kFitness) for mTargetCapability (Reconfigure) ++"); + if (!ChooseCapability(constraints, aPrefs, newCapability, kFitness)) { + *aOutBadConstraint = + MediaConstraintsHelper::FindBadConstraint(constraints, mMediaDevice); + return NS_ERROR_INVALID_ARG; + } + LOG("ChooseCapability(kFitness) for mTargetCapability (Reconfigure) --"); + + if (mCapability == newCapability) { + return NS_OK; + } + + bool started = mState == kStarted; + if (started) { + nsresult rv = Stop(); + if (NS_WARN_IF(NS_FAILED(rv))) { + nsAutoCString name; + GetErrorName(rv, name); + LOG("Video source %p for video device %d Reconfigure() failed " + "unexpectedly in Stop(). rv=%s", + this, mCaptureId, name.Data()); + return NS_ERROR_UNEXPECTED; + } + } + + { + MutexAutoLock lock(mMutex); + // Start() applies mCapability on the device. + mCapability = newCapability; + } + + if (started) { + nsresult rv = Start(); + if (NS_WARN_IF(NS_FAILED(rv))) { + nsAutoCString name; + GetErrorName(rv, name); + LOG("Video source %p for video device %d Reconfigure() failed " + "unexpectedly in Start(). rv=%s", + this, mCaptureId, name.Data()); + return NS_ERROR_UNEXPECTED; + } + } + + return NS_OK; +} + +size_t MediaEngineRemoteVideoSource::NumCapabilities() const { + AssertIsOnOwningThread(); + + if (!mCapabilities.IsEmpty()) { + return mCapabilities.Length(); + } + + int num = camera::GetChildAndCall(&camera::CamerasChild::NumberOfCapabilities, + mCapEngine, mDeviceUUID.get()); + if (num > 0) { + mCapabilities.SetLength(num); + } else { + // The default for devices that don't return discrete capabilities: treat + // them as supporting all capabilities orthogonally. E.g. screensharing. + // CaptureCapability defaults key values to 0, which means accept any value. + mCapabilities.AppendElement(MakeUnique<webrtc::CaptureCapability>()); + mCapabilitiesAreHardcoded = true; + } + + return mCapabilities.Length(); +} + +webrtc::CaptureCapability& MediaEngineRemoteVideoSource::GetCapability( + size_t aIndex) const { + AssertIsOnOwningThread(); + MOZ_RELEASE_ASSERT(aIndex < mCapabilities.Length()); + if (!mCapabilities[aIndex]) { + mCapabilities[aIndex] = MakeUnique<webrtc::CaptureCapability>(); + camera::GetChildAndCall(&camera::CamerasChild::GetCaptureCapability, + mCapEngine, mDeviceUUID.get(), aIndex, + mCapabilities[aIndex].get()); + } + return *mCapabilities[aIndex]; +} + +const TrackingId& MediaEngineRemoteVideoSource::GetTrackingId() const { + AssertIsOnOwningThread(); + MOZ_ASSERT(mState != kReleased); + return mTrackingId; +} + +int MediaEngineRemoteVideoSource::DeliverFrame( + uint8_t* aBuffer, const camera::VideoFrameProperties& aProps) { + // Cameras IPC thread - take great care with accessing members! + + Maybe<int32_t> req_max_width; + Maybe<int32_t> req_max_height; + Maybe<int32_t> req_ideal_width; + Maybe<int32_t> req_ideal_height; + { + MutexAutoLock lock(mMutex); + MOZ_ASSERT(mState == kStarted); + // TODO: These can be removed in bug 1453269. + const int32_t max_width = mCapability.width & 0xffff; + const int32_t max_height = mCapability.height & 0xffff; + const int32_t ideal_width = (mCapability.width >> 16) & 0xffff; + const int32_t ideal_height = (mCapability.height >> 16) & 0xffff; + + req_max_width = max_width ? Some(max_width) : Nothing(); + req_max_height = max_height ? Some(max_height) : Nothing(); + req_ideal_width = ideal_width ? Some(ideal_width) : Nothing(); + req_ideal_height = ideal_height ? Some(ideal_height) : Nothing(); + if (!mFrameDeliveringTrackingId) { + mFrameDeliveringTrackingId = Some(mTrackingId); + } + } + + // This is only used in the case of screen sharing, see bug 1453269. + + if (aProps.rotation() == 90 || aProps.rotation() == 270) { + // This frame is rotated, so what was negotiated as width is now height, + // and vice versa. + std::swap(req_max_width, req_max_height); + std::swap(req_ideal_width, req_ideal_height); + } + + int32_t dst_max_width = + std::min(aProps.width(), req_max_width.valueOr(aProps.width())); + int32_t dst_max_height = + std::min(aProps.height(), req_max_height.valueOr(aProps.height())); + // This logic works for both camera and screen sharing case. + // for camera case, req_ideal_width and req_ideal_height are absent. + int32_t dst_width = req_ideal_width.valueOr(aProps.width()); + int32_t dst_height = req_ideal_height.valueOr(aProps.height()); + + if (!req_ideal_width && req_ideal_height) { + dst_width = *req_ideal_height * aProps.width() / aProps.height(); + } else if (!req_ideal_height && req_ideal_width) { + dst_height = *req_ideal_width * aProps.height() / aProps.width(); + } + dst_width = std::min(dst_width, dst_max_width); + dst_height = std::min(dst_height, dst_max_height); + + // Apply scaling for screen sharing, see bug 1453269. + switch (mCapEngine) { + case camera::ScreenEngine: + case camera::WinEngine: { + // scale to average of portrait and landscape + float scale_width = (float)dst_width / (float)aProps.width(); + float scale_height = (float)dst_height / (float)aProps.height(); + float scale = (scale_width + scale_height) / 2; + // If both req_ideal_width & req_ideal_height are absent, scale is 1, but + // if one is present and the other not, scale precisely to the one present + if (!req_ideal_width) { + scale = scale_height; + } else if (!req_ideal_height) { + scale = scale_width; + } + dst_width = int32_t(scale * (float)aProps.width()); + dst_height = int32_t(scale * (float)aProps.height()); + + // if scaled rectangle exceeds max rectangle, scale to minimum of portrait + // and landscape + if (dst_width > dst_max_width || dst_height > dst_max_height) { + scale_width = (float)dst_max_width / (float)dst_width; + scale_height = (float)dst_max_height / (float)dst_height; + scale = std::min(scale_width, scale_height); + dst_width = int32_t(scale * dst_width); + dst_height = int32_t(scale * dst_height); + } + break; + } + default: { + break; + } + } + + // Ensure width and height are at least two. Smaller frames can lead to + // problems with scaling and video encoding. + dst_width = std::max(2, dst_width); + dst_height = std::max(2, dst_height); + + std::function<void()> callback_unused = []() {}; + rtc::scoped_refptr<webrtc::I420BufferInterface> buffer = + webrtc::WrapI420Buffer( + aProps.width(), aProps.height(), aBuffer, aProps.yStride(), + aBuffer + aProps.yAllocatedSize(), aProps.uStride(), + aBuffer + aProps.yAllocatedSize() + aProps.uAllocatedSize(), + aProps.vStride(), callback_unused); + + if ((dst_width != aProps.width() || dst_height != aProps.height()) && + dst_width <= aProps.width() && dst_height <= aProps.height()) { + PerformanceRecorder<CopyVideoStage> rec("MERVS::CropAndScale"_ns, + *mFrameDeliveringTrackingId, + dst_width, dst_height); + // Destination resolution is smaller than source buffer. We'll rescale. + rtc::scoped_refptr<webrtc::I420Buffer> scaledBuffer = + mRescalingBufferPool.CreateI420Buffer(dst_width, dst_height); + if (!scaledBuffer) { + MOZ_ASSERT_UNREACHABLE( + "We might fail to allocate a buffer, but with this " + "being a recycling pool that shouldn't happen"); + return 0; + } + scaledBuffer->CropAndScaleFrom(*buffer); + buffer = scaledBuffer; + rec.Record(); + } + + layers::PlanarYCbCrData data; + data.mYChannel = const_cast<uint8_t*>(buffer->DataY()); + data.mYStride = buffer->StrideY(); + MOZ_ASSERT(buffer->StrideU() == buffer->StrideV()); + data.mCbCrStride = buffer->StrideU(); + data.mCbChannel = const_cast<uint8_t*>(buffer->DataU()); + data.mCrChannel = const_cast<uint8_t*>(buffer->DataV()); + data.mPictureRect = gfx::IntRect(0, 0, buffer->width(), buffer->height()); + data.mYUVColorSpace = gfx::YUVColorSpace::BT601; + data.mChromaSubsampling = gfx::ChromaSubsampling::HALF_WIDTH_AND_HEIGHT; + + RefPtr<layers::PlanarYCbCrImage> image; + { + PerformanceRecorder<CopyVideoStage> rec( + "MERVS::Copy"_ns, *mFrameDeliveringTrackingId, dst_width, dst_height); + image = mImageContainer->CreatePlanarYCbCrImage(); + if (!image->CopyData(data)) { + MOZ_ASSERT_UNREACHABLE( + "We might fail to allocate a buffer, but with this " + "being a recycling container that shouldn't happen"); + return 0; + } + rec.Record(); + } + +#ifdef DEBUG + static uint32_t frame_num = 0; + LOG_FRAME( + "frame %d (%dx%d)->(%dx%d); rotation %d, timeStamp %u, ntpTimeMs %" PRIu64 + ", renderTimeMs %" PRIu64, + frame_num++, aProps.width(), aProps.height(), dst_width, dst_height, + aProps.rotation(), aProps.timeStamp(), aProps.ntpTimeMs(), + aProps.renderTimeMs()); +#endif + + if (mImageSize.width != dst_width || mImageSize.height != dst_height) { + NS_DispatchToMainThread(NS_NewRunnableFunction( + "MediaEngineRemoteVideoSource::FrameSizeChange", + [settings = mSettings, updated = mSettingsUpdatedByFrame, + holder = std::move(mFirstFramePromiseHolder), dst_width, + dst_height]() mutable { + settings->mWidth.Value() = dst_width; + settings->mHeight.Value() = dst_height; + updated->mValue = true; + // Since mImageSize was initialized to (0,0), we end up here on the + // arrival of the first frame. We resolve the promise representing + // arrival of first frame, after correct settings values have been + // made available (Resolve() is idempotent if already resolved). + holder.ResolveIfExists(true, __func__); + })); + } + + { + MutexAutoLock lock(mMutex); + MOZ_ASSERT(mState == kStarted); + VideoSegment segment; + mImageSize = image->GetSize(); + segment.AppendFrame(image.forget(), mImageSize, mPrincipal); + mTrack->AppendData(&segment); + } + + return 0; +} + +uint32_t MediaEngineRemoteVideoSource::GetDistance( + const webrtc::CaptureCapability& aCandidate, + const NormalizedConstraintSet& aConstraints, + const DistanceCalculation aCalculate) const { + if (aCalculate == kFeasibility) { + return GetFeasibilityDistance(aCandidate, aConstraints); + } + return GetFitnessDistance(aCandidate, aConstraints); +} + +uint32_t MediaEngineRemoteVideoSource::GetFitnessDistance( + const webrtc::CaptureCapability& aCandidate, + const NormalizedConstraintSet& aConstraints) const { + AssertIsOnOwningThread(); + + // Treat width|height|frameRate == 0 on capability as "can do any". + // This allows for orthogonal capabilities that are not in discrete steps. + + typedef MediaConstraintsHelper H; + uint64_t distance = + uint64_t(H::FitnessDistance(mFacingMode, aConstraints.mFacingMode)) + + uint64_t(aCandidate.width ? H::FitnessDistance(int32_t(aCandidate.width), + aConstraints.mWidth) + : 0) + + uint64_t(aCandidate.height + ? H::FitnessDistance(int32_t(aCandidate.height), + aConstraints.mHeight) + : 0) + + uint64_t(aCandidate.maxFPS ? H::FitnessDistance(double(aCandidate.maxFPS), + aConstraints.mFrameRate) + : 0); + return uint32_t(std::min(distance, uint64_t(UINT32_MAX))); +} + +uint32_t MediaEngineRemoteVideoSource::GetFeasibilityDistance( + const webrtc::CaptureCapability& aCandidate, + const NormalizedConstraintSet& aConstraints) const { + AssertIsOnOwningThread(); + + // Treat width|height|frameRate == 0 on capability as "can do any". + // This allows for orthogonal capabilities that are not in discrete steps. + + typedef MediaConstraintsHelper H; + uint64_t distance = + uint64_t(H::FitnessDistance(mFacingMode, aConstraints.mFacingMode)) + + uint64_t(aCandidate.width + ? H::FeasibilityDistance(int32_t(aCandidate.width), + aConstraints.mWidth) + : 0) + + uint64_t(aCandidate.height + ? H::FeasibilityDistance(int32_t(aCandidate.height), + aConstraints.mHeight) + : 0) + + uint64_t(aCandidate.maxFPS + ? H::FeasibilityDistance(double(aCandidate.maxFPS), + aConstraints.mFrameRate) + : 0); + return uint32_t(std::min(distance, uint64_t(UINT32_MAX))); +} + +// Find best capability by removing inferiors. May leave >1 of equal distance + +/* static */ +void MediaEngineRemoteVideoSource::TrimLessFitCandidates( + nsTArray<CapabilityCandidate>& aSet) { + uint32_t best = UINT32_MAX; + for (auto& candidate : aSet) { + if (best > candidate.mDistance) { + best = candidate.mDistance; + } + } + aSet.RemoveElementsBy( + [best](const auto& set) { return set.mDistance > best; }); + MOZ_ASSERT(aSet.Length()); +} + +uint32_t MediaEngineRemoteVideoSource::GetBestFitnessDistance( + const nsTArray<const NormalizedConstraintSet*>& aConstraintSets) const { + AssertIsOnOwningThread(); + + size_t num = NumCapabilities(); + nsTArray<CapabilityCandidate> candidateSet; + for (size_t i = 0; i < num; i++) { + candidateSet.AppendElement(CapabilityCandidate(GetCapability(i))); + } + + bool first = true; + for (const NormalizedConstraintSet* ns : aConstraintSets) { + for (size_t i = 0; i < candidateSet.Length();) { + auto& candidate = candidateSet[i]; + uint32_t distance = GetFitnessDistance(candidate.mCapability, *ns); + if (distance == UINT32_MAX) { + candidateSet.RemoveElementAt(i); + } else { + ++i; + if (first) { + candidate.mDistance = distance; + } + } + } + first = false; + } + if (!candidateSet.Length()) { + return UINT32_MAX; + } + TrimLessFitCandidates(candidateSet); + return candidateSet[0].mDistance; +} + +static const char* ConvertVideoTypeToCStr(webrtc::VideoType aType) { + switch (aType) { + case webrtc::VideoType::kI420: + return "I420"; + case webrtc::VideoType::kIYUV: + case webrtc::VideoType::kYV12: + return "YV12"; + case webrtc::VideoType::kRGB24: + return "24BG"; + case webrtc::VideoType::kABGR: + return "ABGR"; + case webrtc::VideoType::kARGB: + return "ARGB"; + case webrtc::VideoType::kARGB4444: + return "R444"; + case webrtc::VideoType::kRGB565: + return "RGBP"; + case webrtc::VideoType::kARGB1555: + return "RGBO"; + case webrtc::VideoType::kYUY2: + return "YUY2"; + case webrtc::VideoType::kUYVY: + return "UYVY"; + case webrtc::VideoType::kMJPEG: + return "MJPG"; + case webrtc::VideoType::kNV21: + return "NV21"; + case webrtc::VideoType::kNV12: + return "NV12"; + case webrtc::VideoType::kBGRA: + return "BGRA"; + case webrtc::VideoType::kUnknown: + default: + return "unknown"; + } +} + +static void LogCapability(const char* aHeader, + const webrtc::CaptureCapability& aCapability, + uint32_t aDistance) { + LOG("%s: %4u x %4u x %2u maxFps, %s. Distance = %" PRIu32, aHeader, + aCapability.width, aCapability.height, aCapability.maxFPS, + ConvertVideoTypeToCStr(aCapability.videoType), aDistance); +} + +bool MediaEngineRemoteVideoSource::ChooseCapability( + const NormalizedConstraints& aConstraints, const MediaEnginePrefs& aPrefs, + webrtc::CaptureCapability& aCapability, + const DistanceCalculation aCalculate) { + LOG("%s", __PRETTY_FUNCTION__); + AssertIsOnOwningThread(); + + if (MOZ_LOG_TEST(gMediaManagerLog, LogLevel::Debug)) { + LOG("ChooseCapability: prefs: %dx%d @%dfps", aPrefs.GetWidth(), + aPrefs.GetHeight(), aPrefs.mFPS); + MediaConstraintsHelper::LogConstraints(aConstraints); + if (!aConstraints.mAdvanced.empty()) { + LOG("Advanced array[%zu]:", aConstraints.mAdvanced.size()); + for (auto& advanced : aConstraints.mAdvanced) { + MediaConstraintsHelper::LogConstraints(advanced); + } + } + } + + switch (mCapEngine) { + case camera::ScreenEngine: + case camera::WinEngine: { + FlattenedConstraints c(aConstraints); + // The actual resolution to constrain around is not easy to find ahead of + // time (and may in fact change over time), so as a hack, we push ideal + // and max constraints down to desktop_capture_impl.cc and finish the + // algorithm there. + // TODO: This can be removed in bug 1453269. + aCapability.width = + (std::min(0xffff, c.mWidth.mIdeal.valueOr(0)) & 0xffff) << 16 | + (std::min(0xffff, c.mWidth.mMax) & 0xffff); + aCapability.height = + (std::min(0xffff, c.mHeight.mIdeal.valueOr(0)) & 0xffff) << 16 | + (std::min(0xffff, c.mHeight.mMax) & 0xffff); + aCapability.maxFPS = + c.mFrameRate.Clamp(c.mFrameRate.mIdeal.valueOr(aPrefs.mFPS)); + return true; + } + case camera::BrowserEngine: { + FlattenedConstraints c(aConstraints); + aCapability.maxFPS = + c.mFrameRate.Clamp(c.mFrameRate.mIdeal.valueOr(aPrefs.mFPS)); + return true; + } + default: + break; + } + + nsTArray<CapabilityCandidate> candidateSet; + size_t num = NumCapabilities(); + for (size_t i = 0; i < num; i++) { + candidateSet.AppendElement(CapabilityCandidate(GetCapability(i))); + } + + if (mCapabilitiesAreHardcoded && mCapEngine == camera::CameraEngine) { + // We have a hardcoded capability, which means this camera didn't report + // discrete capabilities. It might still allow a ranged capability, so we + // add a couple of default candidates based on prefs and constraints. + // The chosen candidate will be propagated to StartCapture() which will fail + // for an invalid candidate. + MOZ_DIAGNOSTIC_ASSERT(mCapabilities.Length() == 1); + MOZ_DIAGNOSTIC_ASSERT(candidateSet.Length() == 1); + candidateSet.Clear(); + + FlattenedConstraints c(aConstraints); + // Reuse the code across both the low-definition (`false`) pref and + // the high-definition (`true`) pref. + // If there are constraints we try to satisfy them but we default to prefs. + // Note that since constraints are from content and can literally be + // anything we put (rather generous) caps on them. + for (bool isHd : {false, true}) { + webrtc::CaptureCapability cap; + int32_t prefWidth = aPrefs.GetWidth(isHd); + int32_t prefHeight = aPrefs.GetHeight(isHd); + + cap.width = c.mWidth.Get(prefWidth); + cap.width = std::max(0, std::min(cap.width, 7680)); + + cap.height = c.mHeight.Get(prefHeight); + cap.height = std::max(0, std::min(cap.height, 4320)); + + cap.maxFPS = c.mFrameRate.Get(aPrefs.mFPS); + cap.maxFPS = std::max(0, std::min(cap.maxFPS, 480)); + + if (cap.width != prefWidth) { + // Width was affected by constraints. + // We'll adjust the height too so the aspect ratio is retained. + cap.height = cap.width * prefHeight / prefWidth; + } else if (cap.height != prefHeight) { + // Height was affected by constraints but not width. + // We'll adjust the width too so the aspect ratio is retained. + cap.width = cap.height * prefWidth / prefHeight; + } + + if (candidateSet.Contains(cap, CapabilityComparator())) { + continue; + } + LogCapability("Hardcoded capability", cap, 0); + candidateSet.AppendElement(cap); + } + } + + // First, filter capabilities by required constraints (min, max, exact). + + for (size_t i = 0; i < candidateSet.Length();) { + auto& candidate = candidateSet[i]; + candidate.mDistance = + GetDistance(candidate.mCapability, aConstraints, aCalculate); + LogCapability("Capability", candidate.mCapability, candidate.mDistance); + if (candidate.mDistance == UINT32_MAX) { + candidateSet.RemoveElementAt(i); + } else { + ++i; + } + } + + if (candidateSet.IsEmpty()) { + LOG("failed to find capability match from %zu choices", + candidateSet.Length()); + return false; + } + + // Filter further with all advanced constraints (that don't overconstrain). + + for (const auto& cs : aConstraints.mAdvanced) { + nsTArray<CapabilityCandidate> rejects; + for (size_t i = 0; i < candidateSet.Length();) { + if (GetDistance(candidateSet[i].mCapability, cs, aCalculate) == + UINT32_MAX) { + rejects.AppendElement(candidateSet[i]); + candidateSet.RemoveElementAt(i); + } else { + ++i; + } + } + if (!candidateSet.Length()) { + candidateSet.AppendElements(std::move(rejects)); + } + } + MOZ_ASSERT( + candidateSet.Length(), + "advanced constraints filtering step can't reduce candidates to zero"); + + // Remaining algorithm is up to the UA. + + TrimLessFitCandidates(candidateSet); + + // Any remaining multiples all have the same distance. A common case of this + // occurs when no ideal is specified. Lean toward defaults. + uint32_t sameDistance = candidateSet[0].mDistance; + { + MediaTrackConstraintSet prefs; + prefs.mWidth.Construct().SetAsLong() = aPrefs.GetWidth(); + prefs.mHeight.Construct().SetAsLong() = aPrefs.GetHeight(); + prefs.mFrameRate.Construct().SetAsDouble() = aPrefs.mFPS; + NormalizedConstraintSet normPrefs(prefs, false); + + for (auto& candidate : candidateSet) { + candidate.mDistance = + GetDistance(candidate.mCapability, normPrefs, aCalculate); + } + TrimLessFitCandidates(candidateSet); + } + + aCapability = candidateSet[0].mCapability; + + LogCapability("Chosen capability", aCapability, sameDistance); + return true; +} + +void MediaEngineRemoteVideoSource::GetSettings( + MediaTrackSettings& aOutSettings) const { + aOutSettings = *mSettings; +} + +} // namespace mozilla |