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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,
#include "MediaEngineFake.h"
#include "AudioSegment.h"
#include "DOMMediaStream.h"
#include "ImageContainer.h"
#include "ImageTypes.h"
#include "MediaEnginePrefs.h"
#include "MediaEngineSource.h"
#include "MediaTrackGraph.h"
#include "MediaTrackListener.h"
#include "MediaTrackConstraints.h"
#include "mozilla/dom/File.h"
#include "mozilla/MediaManager.h"
#include "mozilla/Mutex.h"
#include "mozilla/SyncRunnable.h"
#include "mozilla/UniquePtr.h"
#include "nsComponentManagerUtils.h"
#include "nsCOMPtr.h"
#include "nsContentUtils.h"
#include "nsITimer.h"
#include "SineWaveGenerator.h"
#include "Tracing.h"
#include "VideoSegment.h"
#include "VideoUtils.h"
#ifdef MOZ_WIDGET_ANDROID
# include "nsISupportsUtils.h"
#endif
#ifdef MOZ_WEBRTC
# include "YuvStamper.h"
#endif
#define VIDEO_WIDTH_MIN 160
#define VIDEO_WIDTH_MAX 4096
#define VIDEO_HEIGHT_MIN 90
#define VIDEO_HEIGHT_MAX 2160
#define DEFAULT_AUDIO_TIMER_MS 10
namespace mozilla {
using namespace mozilla::gfx;
using dom::MediaSourceEnum;
using dom::MediaTrackConstraints;
using dom::MediaTrackSettings;
using dom::VideoFacingModeEnum;
static nsString FakeVideoName() {
// For the purpose of testing we allow to change the name of the fake device
// by pref.
nsAutoString cameraNameFromPref;
nsresult rv;
auto getPref = [&]() {
rv = Preferences::GetString("media.getusermedia.fake-camera-name",
cameraNameFromPref);
};
if (NS_IsMainThread()) {
getPref();
} else {
// Here it is preferred a "hard" block, instead of "soft" block provided
// by sync dispatch, which allows the waiting thread to spin its event
// loop. The latter would allow multiple enumeration requests being
// processed out-of-order.
RefPtr runnable = NS_NewRunnableFunction(__func__, getPref);
SyncRunnable::DispatchToThread(GetMainThreadSerialEventTarget(), runnable);
}
if (NS_SUCCEEDED(rv)) {
return std::move(cameraNameFromPref);
}
return u"Default Video Device"_ns;
}
/**
* Fake video source.
*/
class MediaEngineFakeVideoSource : public MediaEngineSource {
public:
MediaEngineFakeVideoSource();
static nsString GetGroupId();
nsresult Allocate(const dom::MediaTrackConstraints& aConstraints,
const MediaEnginePrefs& aPrefs, uint64_t aWindowID,
const char** aOutBadConstraint) override;
void SetTrack(const RefPtr<MediaTrack>& aTrack,
const PrincipalHandle& aPrincipal) override;
nsresult Start() override;
nsresult Reconfigure(const dom::MediaTrackConstraints& aConstraints,
const MediaEnginePrefs& aPrefs,
const char** aOutBadConstraint) override;
nsresult Stop() override;
nsresult Deallocate() override;
uint32_t GetBestFitnessDistance(
const nsTArray<const NormalizedConstraintSet*>& aConstraintSets)
const override;
void GetSettings(dom::MediaTrackSettings& aOutSettings) const override;
bool IsFake() const override { return true; }
protected:
~MediaEngineFakeVideoSource() = default;
/**
* Called by mTimer when it's time to generate a new frame.
*/
void GenerateFrame();
nsCOMPtr<nsITimer> mTimer;
RefPtr<layers::ImageContainer> mImageContainer;
// Current state of this source.
MediaEngineSourceState mState = kReleased;
RefPtr<layers::Image> mImage;
RefPtr<SourceMediaTrack> mTrack;
PrincipalHandle mPrincipalHandle = PRINCIPAL_HANDLE_NONE;
MediaEnginePrefs mOpts;
int mCb = 16;
int mCr = 16;
// Main thread only.
const RefPtr<media::Refcountable<dom::MediaTrackSettings>> mSettings;
};
MediaEngineFakeVideoSource::MediaEngineFakeVideoSource()
: mTimer(nullptr),
mSettings(MakeAndAddRef<media::Refcountable<MediaTrackSettings>>()) {
mSettings->mWidth.Construct(
int32_t(MediaEnginePrefs::DEFAULT_43_VIDEO_WIDTH));
mSettings->mHeight.Construct(
int32_t(MediaEnginePrefs::DEFAULT_43_VIDEO_HEIGHT));
mSettings->mFrameRate.Construct(double(MediaEnginePrefs::DEFAULT_VIDEO_FPS));
mSettings->mFacingMode.Construct(NS_ConvertASCIItoUTF16(
dom::GetEnumString(VideoFacingModeEnum::Environment)));
}
nsString MediaEngineFakeVideoSource::GetGroupId() {
return u"Fake Video Group"_ns;
}
uint32_t MediaEngineFakeVideoSource::GetBestFitnessDistance(
const nsTArray<const NormalizedConstraintSet*>& aConstraintSets) const {
AssertIsOnOwningThread();
uint64_t distance = 0;
#ifdef MOZ_WEBRTC
// distance is read from first entry only
if (aConstraintSets.Length() >= 1) {
const auto* cs = aConstraintSets.ElementAt(0);
Maybe<nsString> facingMode = Nothing();
distance +=
MediaConstraintsHelper::FitnessDistance(facingMode, cs->mFacingMode);
if (cs->mWidth.mMax < VIDEO_WIDTH_MIN ||
cs->mWidth.mMin > VIDEO_WIDTH_MAX) {
distance += UINT32_MAX;
}
if (cs->mHeight.mMax < VIDEO_HEIGHT_MIN ||
cs->mHeight.mMin > VIDEO_HEIGHT_MAX) {
distance += UINT32_MAX;
}
}
#endif
return uint32_t(std::min(distance, uint64_t(UINT32_MAX)));
}
void MediaEngineFakeVideoSource::GetSettings(
MediaTrackSettings& aOutSettings) const {
MOZ_ASSERT(NS_IsMainThread());
aOutSettings = *mSettings;
}
nsresult MediaEngineFakeVideoSource::Allocate(
const MediaTrackConstraints& aConstraints, const MediaEnginePrefs& aPrefs,
uint64_t aWindowID, const char** aOutBadConstraint) {
AssertIsOnOwningThread();
MOZ_ASSERT(mState == kReleased);
FlattenedConstraints c(aConstraints);
// emulator debug is very, very slow; reduce load on it with smaller/slower
// fake video
mOpts = aPrefs;
mOpts.mWidth =
c.mWidth.Get(aPrefs.mWidth ? aPrefs.mWidth :
#ifdef DEBUG
MediaEnginePrefs::DEFAULT_43_VIDEO_WIDTH / 2
#else
MediaEnginePrefs::DEFAULT_43_VIDEO_WIDTH
#endif
);
mOpts.mHeight =
c.mHeight.Get(aPrefs.mHeight ? aPrefs.mHeight :
#ifdef DEBUG
MediaEnginePrefs::DEFAULT_43_VIDEO_HEIGHT / 2
#else
MediaEnginePrefs::DEFAULT_43_VIDEO_HEIGHT
#endif
);
mOpts.mWidth =
std::max(VIDEO_WIDTH_MIN, std::min(mOpts.mWidth, VIDEO_WIDTH_MAX)) & ~1;
mOpts.mHeight =
std::max(VIDEO_HEIGHT_MIN, std::min(mOpts.mHeight, VIDEO_HEIGHT_MAX)) &
~1;
NS_DispatchToMainThread(NS_NewRunnableFunction(
__func__, [settings = mSettings, frameRate = mOpts.mFPS,
width = mOpts.mWidth, height = mOpts.mHeight]() {
settings->mFrameRate.Value() = frameRate;
settings->mWidth.Value() = width;
settings->mHeight.Value() = height;
}));
mState = kAllocated;
return NS_OK;
}
nsresult MediaEngineFakeVideoSource::Deallocate() {
AssertIsOnOwningThread();
MOZ_ASSERT(!mImage);
MOZ_ASSERT(mState == kStopped || mState == kAllocated);
if (mTrack) {
mTrack->End();
mTrack = nullptr;
mPrincipalHandle = PRINCIPAL_HANDLE_NONE;
}
mState = kReleased;
mImageContainer = nullptr;
return NS_OK;
}
static bool AllocateSolidColorFrame(layers::PlanarYCbCrData& aData, int aWidth,
int aHeight, int aY, int aCb, int aCr) {
MOZ_ASSERT(!(aWidth & 1));
MOZ_ASSERT(!(aHeight & 1));
// Allocate a single frame with a solid color
int yLen = aWidth * aHeight;
int cbLen = yLen >> 2;
int crLen = cbLen;
uint8_t* frame = (uint8_t*)malloc(yLen + cbLen + crLen);
if (!frame) {
return false;
}
memset(frame, aY, yLen);
memset(frame + yLen, aCb, cbLen);
memset(frame + yLen + cbLen, aCr, crLen);
aData.mYChannel = frame;
aData.mYStride = aWidth;
aData.mCbCrStride = aWidth >> 1;
aData.mCbChannel = frame + yLen;
aData.mCrChannel = aData.mCbChannel + cbLen;
aData.mPictureRect = IntRect(0, 0, aWidth, aHeight);
aData.mStereoMode = StereoMode::MONO;
aData.mYUVColorSpace = gfx::YUVColorSpace::BT601;
aData.mChromaSubsampling = gfx::ChromaSubsampling::HALF_WIDTH_AND_HEIGHT;
return true;
}
static void ReleaseFrame(layers::PlanarYCbCrData& aData) {
free(aData.mYChannel);
}
void MediaEngineFakeVideoSource::SetTrack(const RefPtr<MediaTrack>& aTrack,
const PrincipalHandle& aPrincipal) {
AssertIsOnOwningThread();
MOZ_ASSERT(mState == kAllocated);
MOZ_ASSERT(!mTrack);
MOZ_ASSERT(aTrack->AsSourceTrack());
mTrack = aTrack->AsSourceTrack();
mPrincipalHandle = aPrincipal;
}
nsresult MediaEngineFakeVideoSource::Start() {
AssertIsOnOwningThread();
MOZ_ASSERT(mState == kAllocated || mState == kStopped);
MOZ_ASSERT(mTrack, "SetTrack() must happen before Start()");
mTimer = NS_NewTimer(GetCurrentSerialEventTarget());
if (!mTimer) {
return NS_ERROR_FAILURE;
}
if (!mImageContainer) {
mImageContainer = MakeAndAddRef<layers::ImageContainer>(
layers::ImageContainer::ASYNCHRONOUS);
}
// Start timer for subsequent frames
uint32_t interval;
#if defined(MOZ_WIDGET_ANDROID) && defined(DEBUG)
// emulator debug is very, very slow and has problems dealing with realtime
// audio inputs
interval = 10 * (1000 / mOpts.mFPS);
#else
interval = 1000 / mOpts.mFPS;
#endif
mTimer->InitWithNamedFuncCallback(
[](nsITimer* aTimer, void* aClosure) {
RefPtr<MediaEngineFakeVideoSource> source =
static_cast<MediaEngineFakeVideoSource*>(aClosure);
source->GenerateFrame();
},
this, interval, nsITimer::TYPE_REPEATING_SLACK,
"MediaEngineFakeVideoSource::GenerateFrame");
mState = kStarted;
return NS_OK;
}
nsresult MediaEngineFakeVideoSource::Stop() {
AssertIsOnOwningThread();
if (mState == kStopped || mState == kAllocated) {
return NS_OK;
}
MOZ_ASSERT(mState == kStarted);
MOZ_ASSERT(mTimer);
MOZ_ASSERT(mTrack);
mTimer->Cancel();
mTimer = nullptr;
mState = kStopped;
return NS_OK;
}
nsresult MediaEngineFakeVideoSource::Reconfigure(
const MediaTrackConstraints& aConstraints, const MediaEnginePrefs& aPrefs,
const char** aOutBadConstraint) {
return NS_OK;
}
void MediaEngineFakeVideoSource::GenerateFrame() {
AssertIsOnOwningThread();
// Update the target color
if (mCr <= 16) {
if (mCb < 240) {
mCb++;
} else {
mCr++;
}
} else if (mCb >= 240) {
if (mCr < 240) {
mCr++;
} else {
mCb--;
}
} else if (mCr >= 240) {
if (mCb > 16) {
mCb--;
} else {
mCr--;
}
} else {
mCr--;
}
// Allocate a single solid color image
RefPtr<layers::PlanarYCbCrImage> ycbcr_image =
mImageContainer->CreatePlanarYCbCrImage();
layers::PlanarYCbCrData data;
if (NS_WARN_IF(!AllocateSolidColorFrame(data, mOpts.mWidth, mOpts.mHeight,
0x80, mCb, mCr))) {
return;
}
#ifdef MOZ_WEBRTC
uint64_t timestamp = PR_Now();
YuvStamper::Encode(mOpts.mWidth, mOpts.mHeight, mOpts.mWidth, data.mYChannel,
reinterpret_cast<unsigned char*>(×tamp),
sizeof(timestamp), 0, 0);
#endif
bool setData = NS_SUCCEEDED(ycbcr_image->CopyData(data));
MOZ_ASSERT(setData);
// SetData copies data, so we can free the frame
ReleaseFrame(data);
if (!setData) {
return;
}
VideoSegment segment;
segment.AppendFrame(ycbcr_image.forget(),
gfx::IntSize(mOpts.mWidth, mOpts.mHeight),
mPrincipalHandle);
mTrack->AppendData(&segment);
}
// This class is created on the media thread, as part of Start(), then entirely
// self-sustained until destruction, just forwarding calls to Pull().
class AudioSourcePullListener : public MediaTrackListener {
public:
AudioSourcePullListener(RefPtr<SourceMediaTrack> aTrack,
const PrincipalHandle& aPrincipalHandle,
uint32_t aFrequency)
: mTrack(std::move(aTrack)),
mPrincipalHandle(aPrincipalHandle),
mSineGenerator(MakeUnique<SineWaveGenerator<int16_t>>(
mTrack->mSampleRate, aFrequency)) {
MOZ_COUNT_CTOR(AudioSourcePullListener);
}
MOZ_COUNTED_DTOR(AudioSourcePullListener)
void NotifyPull(MediaTrackGraph* aGraph, TrackTime aEndOfAppendedData,
TrackTime aDesiredTime) override;
const RefPtr<SourceMediaTrack> mTrack;
const PrincipalHandle mPrincipalHandle;
const UniquePtr<SineWaveGenerator<int16_t>> mSineGenerator;
};
/**
* Fake audio source.
*/
class MediaEngineFakeAudioSource : public MediaEngineSource {
public:
MediaEngineFakeAudioSource() = default;
static nsString GetUUID();
static nsString GetGroupId();
nsresult Allocate(const dom::MediaTrackConstraints& aConstraints,
const MediaEnginePrefs& aPrefs, uint64_t aWindowID,
const char** aOutBadConstraint) override;
void SetTrack(const RefPtr<MediaTrack>& aTrack,
const PrincipalHandle& aPrincipal) override;
nsresult Start() override;
nsresult Reconfigure(const dom::MediaTrackConstraints& aConstraints,
const MediaEnginePrefs& aPrefs,
const char** aOutBadConstraint) override;
nsresult Stop() override;
nsresult Deallocate() override;
bool IsFake() const override { return true; }
void GetSettings(dom::MediaTrackSettings& aOutSettings) const override;
protected:
~MediaEngineFakeAudioSource() = default;
// Current state of this source.
MediaEngineSourceState mState = kReleased;
RefPtr<SourceMediaTrack> mTrack;
PrincipalHandle mPrincipalHandle = PRINCIPAL_HANDLE_NONE;
uint32_t mFrequency = 1000;
RefPtr<AudioSourcePullListener> mPullListener;
};
nsString MediaEngineFakeAudioSource::GetUUID() {
return u"B7CBD7C1-53EF-42F9-8353-73F61C70C092"_ns;
}
nsString MediaEngineFakeAudioSource::GetGroupId() {
return u"Fake Audio Group"_ns;
}
void MediaEngineFakeAudioSource::GetSettings(
MediaTrackSettings& aOutSettings) const {
MOZ_ASSERT(NS_IsMainThread());
aOutSettings.mAutoGainControl.Construct(false);
aOutSettings.mEchoCancellation.Construct(false);
aOutSettings.mNoiseSuppression.Construct(false);
aOutSettings.mChannelCount.Construct(1);
}
nsresult MediaEngineFakeAudioSource::Allocate(
const MediaTrackConstraints& aConstraints, const MediaEnginePrefs& aPrefs,
uint64_t aWindowID, const char** aOutBadConstraint) {
AssertIsOnOwningThread();
MOZ_ASSERT(mState == kReleased);
mFrequency = aPrefs.mFreq ? aPrefs.mFreq : 1000;
mState = kAllocated;
return NS_OK;
}
nsresult MediaEngineFakeAudioSource::Deallocate() {
AssertIsOnOwningThread();
MOZ_ASSERT(mState == kStopped || mState == kAllocated);
if (mTrack) {
mTrack->End();
mTrack = nullptr;
mPrincipalHandle = PRINCIPAL_HANDLE_NONE;
}
mState = kReleased;
return NS_OK;
}
void MediaEngineFakeAudioSource::SetTrack(const RefPtr<MediaTrack>& aTrack,
const PrincipalHandle& aPrincipal) {
AssertIsOnOwningThread();
MOZ_ASSERT(mState == kAllocated);
MOZ_ASSERT(!mTrack);
MOZ_ASSERT(aTrack->AsSourceTrack());
mTrack = aTrack->AsSourceTrack();
mPrincipalHandle = aPrincipal;
}
nsresult MediaEngineFakeAudioSource::Start() {
AssertIsOnOwningThread();
if (mState == kStarted) {
return NS_OK;
}
MOZ_ASSERT(mState == kAllocated || mState == kStopped);
MOZ_ASSERT(mTrack, "SetTrack() must happen before Start()");
if (!mPullListener) {
mPullListener = MakeAndAddRef<AudioSourcePullListener>(
mTrack, mPrincipalHandle, mFrequency);
}
mState = kStarted;
NS_DispatchToMainThread(NS_NewRunnableFunction(
__func__, [track = mTrack, listener = mPullListener]() {
if (track->IsDestroyed()) {
return;
}
track->AddListener(listener);
track->SetPullingEnabled(true);
}));
return NS_OK;
}
nsresult MediaEngineFakeAudioSource::Stop() {
AssertIsOnOwningThread();
if (mState == kStopped || mState == kAllocated) {
return NS_OK;
}
MOZ_ASSERT(mState == kStarted);
mState = kStopped;
NS_DispatchToMainThread(NS_NewRunnableFunction(
__func__, [track = mTrack, listener = std::move(mPullListener)]() {
if (track->IsDestroyed()) {
return;
}
track->RemoveListener(listener);
track->SetPullingEnabled(false);
}));
return NS_OK;
}
nsresult MediaEngineFakeAudioSource::Reconfigure(
const MediaTrackConstraints& aConstraints, const MediaEnginePrefs& aPrefs,
const char** aOutBadConstraint) {
return NS_OK;
}
void AudioSourcePullListener::NotifyPull(MediaTrackGraph* aGraph,
TrackTime aEndOfAppendedData,
TrackTime aDesiredTime) {
TRACE_COMMENT("SourceMediaTrack::NotifyPull", "SourceMediaTrack %p",
mTrack.get());
AudioSegment segment;
TrackTicks delta = aDesiredTime - aEndOfAppendedData;
CheckedInt<size_t> bufferSize(sizeof(int16_t));
bufferSize *= delta;
RefPtr<SharedBuffer> buffer = SharedBuffer::Create(bufferSize);
int16_t* dest = static_cast<int16_t*>(buffer->Data());
mSineGenerator->generate(dest, delta);
AutoTArray<const int16_t*, 1> channels;
channels.AppendElement(dest);
segment.AppendFrames(buffer.forget(), channels, delta, mPrincipalHandle);
mTrack->AppendData(&segment);
}
MediaEngineFake::MediaEngineFake() = default;
MediaEngineFake::~MediaEngineFake() = default;
void MediaEngineFake::EnumerateDevices(
MediaSourceEnum aMediaSource, MediaSinkEnum aMediaSink,
nsTArray<RefPtr<MediaDevice>>* aDevices) {
AssertIsOnOwningThread();
using IsScary = MediaDevice::IsScary;
using OsPromptable = MediaDevice::OsPromptable;
if (aMediaSink == MediaSinkEnum::Speaker) {
NS_WARNING("No default implementation for MediaSinkEnum::Speaker");
}
switch (aMediaSource) {
case MediaSourceEnum::Camera: {
nsString name = FakeVideoName();
aDevices->EmplaceBack(
new MediaDevice(this, aMediaSource, name, /*aRawId=*/name,
MediaEngineFakeVideoSource::GetGroupId(), IsScary::No,
OsPromptable::No));
return;
}
case MediaSourceEnum::Microphone:
aDevices->EmplaceBack(
new MediaDevice(this, aMediaSource, u"Default Audio Device"_ns,
MediaEngineFakeAudioSource::GetUUID(),
MediaEngineFakeAudioSource::GetGroupId(), IsScary::No,
OsPromptable::No));
return;
default:
MOZ_ASSERT_UNREACHABLE("Unsupported source type");
return;
}
}
RefPtr<MediaEngineSource> MediaEngineFake::CreateSource(
const MediaDevice* aMediaDevice) {
MOZ_ASSERT(aMediaDevice->mEngine == this);
switch (aMediaDevice->mMediaSource) {
case MediaSourceEnum::Camera:
return new MediaEngineFakeVideoSource();
case MediaSourceEnum::Microphone:
return new MediaEngineFakeAudioSource();
default:
MOZ_ASSERT_UNREACHABLE("Unsupported source type");
return nullptr;
}
}
} // namespace mozilla