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gecko-dev/dom/media/DOMMediaStream.h

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/* -*- 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/. */
#ifndef NSDOMMEDIASTREAM_H_
#define NSDOMMEDIASTREAM_H_
#include "ImageContainer.h"
#include "nsAutoPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsWrapperCache.h"
#include "StreamTracks.h"
#include "nsIDOMWindow.h"
#include "nsIPrincipal.h"
#include "MediaTrackConstraints.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "PrincipalChangeObserver.h"
// X11 has a #define for CurrentTime. Unbelievable :-(.
// See dom/media/webaudio/AudioContext.h for more fun!
#ifdef CurrentTime
#undef CurrentTime
#endif
namespace mozilla {
class AbstractThread;
class DOMLocalMediaStream;
class DOMMediaStream;
class MediaStream;
class MediaInputPort;
class DirectMediaStreamListener;
class MediaStreamGraph;
class ProcessedMediaStream;
enum class BlockingMode;
namespace dom {
class AudioNode;
class HTMLCanvasElement;
class MediaStreamTrack;
class MediaStreamTrackSource;
class AudioStreamTrack;
class VideoStreamTrack;
class AudioTrack;
class VideoTrack;
class AudioTrackList;
class VideoTrackList;
class MediaTrackListListener;
} // namespace dom
namespace layers {
class ImageContainer;
class OverlayImage;
} // namespace layers
namespace media {
template<typename V, typename E> class Pledge;
} // namespace media
#define NS_DOMMEDIASTREAM_IID \
{ 0x8cb65468, 0x66c0, 0x444e, \
{ 0x89, 0x9f, 0x89, 0x1d, 0x9e, 0xd2, 0xbe, 0x7c } }
class OnTracksAvailableCallback {
public:
virtual ~OnTracksAvailableCallback() {}
virtual void NotifyTracksAvailable(DOMMediaStream* aStream) = 0;
};
/**
* Interface through which a DOMMediaStream can query its producer for a
* MediaStreamTrackSource. This will be used whenever a track occurs in the
* DOMMediaStream's owned stream that has not yet been created on the main
* thread (see DOMMediaStream::CreateOwnDOMTrack).
*/
class MediaStreamTrackSourceGetter : public nsISupports
{
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_CLASS(MediaStreamTrackSourceGetter)
public:
MediaStreamTrackSourceGetter()
{
}
virtual already_AddRefed<dom::MediaStreamTrackSource>
GetMediaStreamTrackSource(TrackID aInputTrackID) = 0;
protected:
virtual ~MediaStreamTrackSourceGetter()
{
}
};
/**
* DOM wrapper for MediaStreams.
*
* To account for track operations such as clone(), addTrack() and
* removeTrack(), a DOMMediaStream wraps three internal (and chained)
* MediaStreams:
* 1. mInputStream
* - Controlled by the owner/source of the DOMMediaStream.
* It's a stream of the type indicated by
* - DOMMediaStream::CreateSourceStream/CreateTrackUnionStream. A source
* typically creates its DOMMediaStream, creates the MediaStreamTracks
* owned by said stream, then gets the internal input stream to which it
* feeds data for the previously created tracks.
* - When necessary it can create tracks on the internal stream only and
* their corresponding MediaStreamTracks will be asynchronously created.
* 2. mOwnedStream
* - A TrackUnionStream containing tracks owned by this stream.
* - The internal model of a MediaStreamTrack consists of its owning
* DOMMediaStream and the TrackID of the corresponding internal track in
* the owning DOMMediaStream's mOwnedStream.
* - The owned stream is different from the input stream since a cloned
* DOMMediaStream is also the owner of its (cloned) MediaStreamTracks.
* - Stopping an original track shall not stop its clone. This is
* solved by stopping it at the owned stream, while the clone's owned
* stream gets data directly from the original input stream.
* - A DOMMediaStream (original or clone) gets all tracks dynamically
* added by the source automatically forwarded by having a TRACK_ANY
* MediaInputPort set up from the owning DOMMediaStream's input stream
* to this DOMMediaStream's owned stream.
* 3. mPlaybackStream
* - A TrackUnionStream containing the tracks corresponding to the
* MediaStreamTracks currently in this DOMMediaStream (per getTracks()).
* - Similarly as for mOwnedStream, there's a TRACK_ANY MediaInputPort set
* up from the owned stream to the playback stream to allow tracks
* dynamically added by the source to be automatically forwarded to any
* audio or video sinks.
* - MediaStreamTracks added by addTrack() are set up with a MediaInputPort
* locked to their internal TrackID, from their owning DOMMediaStream's
* owned stream to this playback stream.
*
*
* A graphical representation of how tracks are connected in various cases as
* follows:
*
* addTrack()ed case:
* DOMStream A
* Input Owned Playback
* t1 ---------> t1 ------------> t1 <- MediaStreamTrack X
* (pointing to t1 in A)
* --------> t2 <- MediaStreamTrack Y
* / (pointing to t1 in B)
* DOMStream B /
* Input Owned / Playback
* t1 ---------> t1 ------------> t1 <- MediaStreamTrack Y
* (pointing to t1 in B)
*
* removeTrack()ed case:
* DOMStream A
* Input Owned Playback
* t1 ---------> t1 <- No tracks
*
*
* clone()d case:
* DOMStream A
* Input Owned Playback
* t1 ---------> t1 ------------> t1 <- MediaStreamTrack X
* \ (pointing to t1 in A)
* -----
* DOMStream B \
* Input \ Owned Playback
* -> t1 ------------> t1 <- MediaStreamTrack Y
* (pointing to t1 in B)
*
*
* addTrack()ed, removeTrack()ed and clone()d case:
*
* Here we have done the following:
* var A = someStreamWithTwoTracks;
* var B = someStreamWithOneTrack;
* var X = A.getTracks()[0];
* var Y = A.getTracks()[1];
* var Z = B.getTracks()[0];
* A.addTrack(Z);
* A.removeTrack(X);
* B.removeTrack(Z);
* var A' = A.clone();
*
* DOMStream A
* Input Owned Playback
* t1 ---------> t1 <- MediaStreamTrack X (removed)
* (pointing to t1 in A)
* t2 ---------> t2 ------------> t2 <- MediaStreamTrack Y
* \ (pointing to t2 in A)
* \ ------> t3 <- MediaStreamTrack Z
* \ / (pointing to t1 in B)
* DOMStream B \ /
* Input \ Owned / Playback
* t1 ---^-----> t1 --- <- MediaStreamTrack Z (removed)
* \ \ (pointing to t1 in B)
* \ \
* DOMStream A' \ \
* Input \ \ Owned Playback
* \ -> t1 ------------> t1 <- MediaStreamTrack Y'
* \ (pointing to t1 in A')
* ----> t2 ------------> t2 <- MediaStreamTrack Z'
* (pointing to t2 in A')
*/
class DOMMediaStream : public DOMEventTargetHelper,
public dom::PrincipalChangeObserver<dom::MediaStreamTrack>
{
friend class DOMLocalMediaStream;
friend class dom::MediaStreamTrack;
typedef dom::MediaStreamTrack MediaStreamTrack;
typedef dom::AudioStreamTrack AudioStreamTrack;
typedef dom::VideoStreamTrack VideoStreamTrack;
typedef dom::MediaStreamTrackSource MediaStreamTrackSource;
typedef dom::AudioTrack AudioTrack;
typedef dom::VideoTrack VideoTrack;
typedef dom::AudioTrackList AudioTrackList;
typedef dom::VideoTrackList VideoTrackList;
public:
typedef dom::MediaTrackConstraints MediaTrackConstraints;
class TrackListener {
public:
virtual ~TrackListener() {}
/**
* Called when the DOMMediaStream has a live track added, either by
* script (addTrack()) or the source creating one.
*/
virtual void
NotifyTrackAdded(const RefPtr<MediaStreamTrack>& aTrack) {};
/**
* Called when the DOMMediaStream removes a live track from playback, either
* by script (removeTrack(), track.stop()) or the source ending it.
*/
virtual void
NotifyTrackRemoved(const RefPtr<MediaStreamTrack>& aTrack) {};
/**
* Called when the DOMMediaStream has become active.
*/
virtual void
NotifyActive() {};
/**
* Called when the DOMMediaStream has become inactive.
*/
virtual void
NotifyInactive() {};
};
/**
* TrackPort is a representation of a MediaStreamTrack-MediaInputPort pair
* that make up a link between the Owned stream and the Playback stream.
*
* Semantically, the track is the identifier/key and the port the value of this
* connection.
*
* The input port can be shared between several TrackPorts. This is the case
* for DOMMediaStream's mPlaybackPort which forwards all tracks in its
* mOwnedStream automatically.
*
* If the MediaStreamTrack is owned by another DOMMediaStream (called A) than
* the one owning the TrackPort (called B), the input port (locked to the
* MediaStreamTrack's TrackID) connects A's mOwnedStream to B's mPlaybackStream.
*
* A TrackPort may never leave the DOMMediaStream it was created in. Internal
* use only.
*/
class TrackPort
{
public:
NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(TrackPort)
NS_DECL_CYCLE_COLLECTION_NATIVE_CLASS(TrackPort)
/**
* Indicates MediaInputPort ownership to the TrackPort.
*
* OWNED - Owned by the TrackPort itself. TrackPort must destroy the
* input port when it's destructed.
* EXTERNAL - Owned by another entity. It's the caller's responsibility to
* ensure the the MediaInputPort outlives the TrackPort.
*/
enum class InputPortOwnership {
OWNED = 1,
EXTERNAL
};
TrackPort(MediaInputPort* aInputPort,
MediaStreamTrack* aTrack,
const InputPortOwnership aOwnership);
protected:
virtual ~TrackPort();
public:
void DestroyInputPort();
/**
* Returns the source stream of the input port.
*/
MediaStream* GetSource() const;
/**
* Returns the track ID this track is locked to in the source stream of the
* input port.
*/
TrackID GetSourceTrackId() const;
MediaInputPort* GetInputPort() const { return mInputPort; }
MediaStreamTrack* GetTrack() const { return mTrack; }
/**
* Blocks aTrackId from going into mInputPort unless the port has been
* destroyed. Returns a pledge that gets resolved when the MediaStreamGraph
* has applied the block in the playback stream.
*/
already_AddRefed<media::Pledge<bool, nsresult>>
BlockSourceTrackId(TrackID aTrackId, BlockingMode aBlockingMode);
private:
RefPtr<MediaInputPort> mInputPort;
RefPtr<MediaStreamTrack> mTrack;
// Defines if we've been given ownership of the input port or if it's owned
// externally. The owner is responsible for destroying the port.
const InputPortOwnership mOwnership;
};
DOMMediaStream(nsPIDOMWindowInner* aWindow,
MediaStreamTrackSourceGetter* aTrackSourceGetter);
NS_DECL_ISUPPORTS_INHERITED
NS_REALLY_FORWARD_NSIDOMEVENTTARGET(DOMEventTargetHelper)
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DOMMediaStream,
DOMEventTargetHelper)
NS_DECLARE_STATIC_IID_ACCESSOR(NS_DOMMEDIASTREAM_IID)
nsPIDOMWindowInner* GetParentObject() const
{
return mWindow;
}
virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
// WebIDL
static already_AddRefed<DOMMediaStream>
Constructor(const dom::GlobalObject& aGlobal,
ErrorResult& aRv);
static already_AddRefed<DOMMediaStream>
Constructor(const dom::GlobalObject& aGlobal,
const DOMMediaStream& aStream,
ErrorResult& aRv);
static already_AddRefed<DOMMediaStream>
Constructor(const dom::GlobalObject& aGlobal,
const dom::Sequence<OwningNonNull<MediaStreamTrack>>& aTracks,
ErrorResult& aRv);
double CurrentTime();
void GetId(nsAString& aID) const;
void GetAudioTracks(nsTArray<RefPtr<AudioStreamTrack> >& aTracks) const;
void GetVideoTracks(nsTArray<RefPtr<VideoStreamTrack> >& aTracks) const;
void GetTracks(nsTArray<RefPtr<MediaStreamTrack> >& aTracks) const;
MediaStreamTrack* GetTrackById(const nsAString& aId) const;
void AddTrack(MediaStreamTrack& aTrack);
void RemoveTrack(MediaStreamTrack& aTrack);
/** Identical to CloneInternal(TrackForwardingOption::EXPLICIT) */
already_AddRefed<DOMMediaStream> Clone();
bool Active() const;
IMPL_EVENT_HANDLER(addtrack)
// NON-WebIDL
/**
* Option to provide to CloneInternal() of which tracks should be forwarded
* from the source stream (`this`) to the returned stream clone.
*
* CURRENT forwards the tracks currently in the source stream's track set.
* ALL forwards like EXPLICIT plus any and all future tracks originating
* from the same input stream as the source DOMMediaStream (`this`).
*/
enum class TrackForwardingOption {
CURRENT,
ALL
};
already_AddRefed<DOMMediaStream> CloneInternal(TrackForwardingOption aForwarding);
MediaStreamTrack* GetOwnedTrackById(const nsAString& aId);
/**
* Returns true if this DOMMediaStream has aTrack in its mPlaybackStream.
*/
bool HasTrack(const MediaStreamTrack& aTrack) const;
/**
* Returns true if this DOMMediaStream owns aTrack.
*/
bool OwnsTrack(const MediaStreamTrack& aTrack) const;
/**
* Returns the corresponding MediaStreamTrack if it's in our mOwnedStream.
* aInputTrackID should match the track's TrackID in its input stream,
* and aTrackID the TrackID in mOwnedStream.
*
* When aTrackID is not supplied or set to TRACK_ANY, we return the first
* MediaStreamTrack that matches the given input track. Note that there may
* be multiple MediaStreamTracks matching the same input track, but that they
* in that case all share the same MediaStreamTrackSource.
*/
MediaStreamTrack* FindOwnedDOMTrack(MediaStream* aInputStream,
TrackID aInputTrackID,
TrackID aTrackID = TRACK_ANY) const;
/**
* Returns the TrackPort connecting aTrack's input stream to mOwnedStream,
* or nullptr if aTrack is not owned by this DOMMediaStream.
*/
TrackPort* FindOwnedTrackPort(const MediaStreamTrack& aTrack) const;
/**
* Returns the corresponding MediaStreamTrack if it's in our mPlaybackStream.
* aInputTrackID should match the track's TrackID in its owned stream.
*/
MediaStreamTrack* FindPlaybackDOMTrack(MediaStream* aInputStream,
TrackID aInputTrackID) const;
/**
* Returns the TrackPort connecting mOwnedStream to mPlaybackStream for aTrack.
*/
TrackPort* FindPlaybackTrackPort(const MediaStreamTrack& aTrack) const;
MediaStream* GetInputStream() const { return mInputStream; }
ProcessedMediaStream* GetOwnedStream() const { return mOwnedStream; }
ProcessedMediaStream* GetPlaybackStream() const { return mPlaybackStream; }
/**
* Allows a video element to identify this stream as a camera stream, which
* needs special treatment.
*/
virtual MediaStream* GetCameraStream() const { return nullptr; }
/**
* Allows users to get access to media data without going through graph
* queuing. Returns a bool to let us know if direct data will be delivered.
*/
bool AddDirectListener(DirectMediaStreamListener *aListener);
void RemoveDirectListener(DirectMediaStreamListener *aListener);
/**
* Legacy method that returns true when the playback stream has finished.
*/
bool IsFinished() const;
/**
* Becomes inactive only when the playback stream has finished.
*/
void SetInactiveOnFinish();
/**
* Returns a principal indicating who may access this stream. The stream contents
* can only be accessed by principals subsuming this principal.
*/
nsIPrincipal* GetPrincipal() { return mPrincipal; }
/**
* Returns a principal indicating who may access video data of this stream.
* The video principal will be a combination of all live video tracks.
*/
nsIPrincipal* GetVideoPrincipal() { return mVideoPrincipal; }
// From PrincipalChangeObserver<MediaStreamTrack>.
void PrincipalChanged(MediaStreamTrack* aTrack) override;
/**
* Add a PrincipalChangeObserver to this stream.
*
* Returns true if it was successfully added.
*
* Ownership of the PrincipalChangeObserver remains with the caller, and it's
* the caller's responsibility to remove the observer before it dies.
*/
bool AddPrincipalChangeObserver(dom::PrincipalChangeObserver<DOMMediaStream>* aObserver);
/**
* Remove an added PrincipalChangeObserver from this stream.
*
* Returns true if it was successfully removed.
*/
bool RemovePrincipalChangeObserver(dom::PrincipalChangeObserver<DOMMediaStream>* aObserver);
// Webrtc allows the remote side to name a stream whatever it wants, and we
// need to surface this to content.
void AssignId(const nsAString& aID) { mID = aID; }
/**
* Create a DOMMediaStream whose underlying input stream is a SourceMediaStream.
*/
static already_AddRefed<DOMMediaStream> CreateSourceStreamAsInput(nsPIDOMWindowInner* aWindow,
MediaStreamGraph* aGraph,
MediaStreamTrackSourceGetter* aTrackSourceGetter = nullptr);
/**
* Create a DOMMediaStream whose underlying input stream is a TrackUnionStream.
*/
static already_AddRefed<DOMMediaStream> CreateTrackUnionStreamAsInput(nsPIDOMWindowInner* aWindow,
MediaStreamGraph* aGraph,
MediaStreamTrackSourceGetter* aTrackSourceGetter = nullptr);
/**
* Create an DOMMediaStream whose underlying input stream is an
* AudioCaptureStream.
*/
static already_AddRefed<DOMMediaStream>
CreateAudioCaptureStreamAsInput(nsPIDOMWindowInner* aWindow,
nsIPrincipal* aPrincipal,
MediaStreamGraph* aGraph);
void SetLogicalStreamStartTime(StreamTime aTime)
{
mLogicalStreamStartTime = aTime;
}
/**
* Adds a MediaStreamTrack to mTracks and raises "addtrack".
*
* Note that "addtrack" is raised synchronously and only has an effect if
* this MediaStream is already exposed to script. For spec compliance this is
* to be called from an async task.
*/
void AddTrackInternal(MediaStreamTrack* aTrack);
/**
* Called for each track in our owned stream to indicate to JS that we
* are carrying that track.
*
* Pre-creates a MediaStreamTrack and returns it.
* It is up to the caller to make sure it is added through AddTrackInternal.
*/
already_AddRefed<MediaStreamTrack> CreateDOMTrack(TrackID aTrackID,
MediaSegment::Type aType,
MediaStreamTrackSource* aSource,
const MediaTrackConstraints& aConstraints = MediaTrackConstraints());
/**
* Creates a MediaStreamTrack cloned from aTrack, adds it to mTracks and
* returns it.
* aCloneTrackID is the TrackID the new track will get in mOwnedStream.
*/
already_AddRefed<MediaStreamTrack> CloneDOMTrack(MediaStreamTrack& aTrack,
TrackID aCloneTrackID);
// When the initial set of tracks has been added, run
// aCallback->NotifyTracksAvailable.
// It is allowed to do anything, including run script.
// aCallback may run immediately during this call if tracks are already
// available!
// We only care about track additions, we'll fire the notification even if
// some of the tracks have been removed.
// Takes ownership of aCallback.
void OnTracksAvailable(OnTracksAvailableCallback* aCallback);
/**
* Add an nsISupports object that this stream will keep alive as long as
* the stream itself is alive.
*/
void AddConsumerToKeepAlive(nsISupports* aConsumer)
{
mConsumersToKeepAlive.AppendElement(aConsumer);
}
// Registers a track listener to this MediaStream, for listening to changes
// to our track set. The caller must call UnregisterTrackListener before
// being destroyed, so we don't hold on to a dead pointer. Main thread only.
void RegisterTrackListener(TrackListener* aListener);
// Unregisters a track listener from this MediaStream. The caller must call
// UnregisterTrackListener before being destroyed, so we don't hold on to
// a dead pointer. Main thread only.
void UnregisterTrackListener(TrackListener* aListener);
protected:
virtual ~DOMMediaStream();
void Destroy();
void InitSourceStream(MediaStreamGraph* aGraph);
void InitTrackUnionStream(MediaStreamGraph* aGraph);
void InitAudioCaptureStream(nsIPrincipal* aPrincipal, MediaStreamGraph* aGraph);
// Sets up aStream as mInputStream. A producer may append data to a
// SourceMediaStream input stream, or connect another stream to a
// TrackUnionStream input stream.
void InitInputStreamCommon(MediaStream* aStream, MediaStreamGraph* aGraph);
// Sets up a new TrackUnionStream as mOwnedStream and connects it to
// mInputStream with a TRACK_ANY MediaInputPort if available.
// If this DOMMediaStream should have an input stream (producing data),
// it has to be initiated before the owned stream.
void InitOwnedStreamCommon(MediaStreamGraph* aGraph);
// Sets up a new TrackUnionStream as mPlaybackStream and connects it to
// mOwnedStream with a TRACK_ANY MediaInputPort if available.
// If this DOMMediaStream should have an owned stream (producer or clone),
// it has to be initiated before the playback stream.
void InitPlaybackStreamCommon(MediaStreamGraph* aGraph);
void CheckTracksAvailable();
// Called when MediaStreamGraph has finished an iteration where tracks were
// created.
void NotifyTracksCreated();
// Called when our playback stream has finished in the MediaStreamGraph.
void NotifyFinished();
// Dispatches NotifyActive() to all registered track listeners.
void NotifyActive();
// Dispatches NotifyInactive() to all registered track listeners.
void NotifyInactive();
// Dispatches NotifyTrackAdded() to all registered track listeners.
void NotifyTrackAdded(const RefPtr<MediaStreamTrack>& aTrack);
// Dispatches NotifyTrackRemoved() to all registered track listeners.
void NotifyTrackRemoved(const RefPtr<MediaStreamTrack>& aTrack);
// Dispatches "addtrack" or "removetrack".
nsresult DispatchTrackEvent(const nsAString& aName,
const RefPtr<MediaStreamTrack>& aTrack);
class OwnedStreamListener;
friend class OwnedStreamListener;
class PlaybackStreamListener;
friend class PlaybackStreamListener;
class PlaybackTrackListener;
friend class PlaybackTrackListener;
/**
* Block a track in our playback stream. Calls NotifyPlaybackTrackBlocked()
* after the MediaStreamGraph has applied the block and the track is no longer
* live.
*/
void BlockPlaybackTrack(TrackPort* aTrack);
/**
* Called on main thread after MediaStreamGraph has applied a track block in
* our playback stream.
*/
void NotifyPlaybackTrackBlocked();
// Recomputes the current principal of this stream based on the set of tracks
// it currently contains. PrincipalChangeObservers will be notified only if
// the principal changes.
void RecomputePrincipal();
// StreamTime at which the currentTime attribute would return 0.
StreamTime mLogicalStreamStartTime;
// We need this to track our parent object.
nsCOMPtr<nsPIDOMWindowInner> mWindow;
// MediaStreams are owned by the graph, but we tell them when to die,
// and they won't die until we let them.
// This stream contains tracks used as input by us. Cloning happens from this
// stream. Tracks may exist in these stream but not in |mOwnedStream| if they
// have been stopped.
MediaStream* mInputStream;
// This stream contains tracks owned by us (if we were created directly from
// source, or cloned from some other stream). Tracks map to |mOwnedTracks|.
ProcessedMediaStream* mOwnedStream;
// This stream contains tracks currently played by us, despite of owner.
// Tracks map to |mTracks|.
ProcessedMediaStream* mPlaybackStream;
// This port connects mInputStream to mOwnedStream. All tracks forwarded.
RefPtr<MediaInputPort> mOwnedPort;
// This port connects mOwnedStream to mPlaybackStream. All tracks not
// explicitly blocked due to removal are forwarded.
RefPtr<MediaInputPort> mPlaybackPort;
// MediaStreamTracks corresponding to tracks in our mOwnedStream.
AutoTArray<RefPtr<TrackPort>, 2> mOwnedTracks;
// MediaStreamTracks corresponding to tracks in our mPlaybackStream.
AutoTArray<RefPtr<TrackPort>, 2> mTracks;
// Number of MediaStreamTracks that have been removed on main thread but are
// waiting to be removed on MediaStreamGraph thread.
size_t mTracksPendingRemoval;
// The interface through which we can query the stream producer for
// track sources.
RefPtr<MediaStreamTrackSourceGetter> mTrackSourceGetter;
// Listener tracking changes to mOwnedStream. We use this to notify the
// MediaStreamTracks we own about state changes.
RefPtr<OwnedStreamListener> mOwnedListener;
// Listener tracking changes to mPlaybackStream. This drives state changes
// in this DOMMediaStream and notifications to mTrackListeners.
RefPtr<PlaybackStreamListener> mPlaybackListener;
// Listener tracking when live MediaStreamTracks in mTracks end.
RefPtr<PlaybackTrackListener> mPlaybackTrackListener;
nsTArray<nsAutoPtr<OnTracksAvailableCallback> > mRunOnTracksAvailable;
// Set to true after MediaStreamGraph has created tracks for mPlaybackStream.
bool mTracksCreated;
nsString mID;
// Keep these alive while the stream is alive.
nsTArray<nsCOMPtr<nsISupports>> mConsumersToKeepAlive;
bool mNotifiedOfMediaStreamGraphShutdown;
// The track listeners subscribe to changes in this stream's track set.
nsTArray<TrackListener*> mTrackListeners;
// True if this stream has live tracks.
bool mActive;
// True if this stream only sets mActive to false when its playback stream
// finishes. This is a hack to maintain legacy functionality for playing a
// HTMLMediaElement::MozCaptureStream(). See bug 1302379.
bool mSetInactiveOnFinish;
private:
void NotifyPrincipalChanged();
// Principal identifying who may access the collected contents of this stream.
// If null, this stream can be used by anyone because it has no content yet.
nsCOMPtr<nsIPrincipal> mPrincipal;
// Video principal is used by video element as access is requested to its
// image data.
nsCOMPtr<nsIPrincipal> mVideoPrincipal;
nsTArray<dom::PrincipalChangeObserver<DOMMediaStream>*> mPrincipalChangeObservers;
CORSMode mCORSMode;
};
NS_DEFINE_STATIC_IID_ACCESSOR(DOMMediaStream,
NS_DOMMEDIASTREAM_IID)
#define NS_DOMLOCALMEDIASTREAM_IID \
{ 0xb1437260, 0xec61, 0x4dfa, \
{ 0x92, 0x54, 0x04, 0x44, 0xe2, 0xb5, 0x94, 0x9c } }
class DOMLocalMediaStream : public DOMMediaStream
{
public:
explicit DOMLocalMediaStream(nsPIDOMWindowInner* aWindow,
MediaStreamTrackSourceGetter* aTrackSourceGetter)
: DOMMediaStream(aWindow, aTrackSourceGetter) {}
NS_DECL_ISUPPORTS_INHERITED
NS_DECLARE_STATIC_IID_ACCESSOR(NS_DOMLOCALMEDIASTREAM_IID)
virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
void Stop();
/**
* Create an nsDOMLocalMediaStream whose underlying stream is a SourceMediaStream.
*/
static already_AddRefed<DOMLocalMediaStream>
CreateSourceStreamAsInput(nsPIDOMWindowInner* aWindow,
MediaStreamGraph* aGraph,
MediaStreamTrackSourceGetter* aTrackSourceGetter = nullptr);
/**
* Create an nsDOMLocalMediaStream whose underlying stream is a TrackUnionStream.
*/
static already_AddRefed<DOMLocalMediaStream>
CreateTrackUnionStreamAsInput(nsPIDOMWindowInner* aWindow,
MediaStreamGraph* aGraph,
MediaStreamTrackSourceGetter* aTrackSourceGetter = nullptr);
protected:
virtual ~DOMLocalMediaStream();
void StopImpl();
};
NS_DEFINE_STATIC_IID_ACCESSOR(DOMLocalMediaStream,
NS_DOMLOCALMEDIASTREAM_IID)
class DOMAudioNodeMediaStream : public DOMMediaStream
{
typedef dom::AudioNode AudioNode;
public:
DOMAudioNodeMediaStream(nsPIDOMWindowInner* aWindow, AudioNode* aNode);
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(DOMAudioNodeMediaStream, DOMMediaStream)
/**
* Create a DOMAudioNodeMediaStream whose underlying stream is a TrackUnionStream.
*/
static already_AddRefed<DOMAudioNodeMediaStream>
CreateTrackUnionStreamAsInput(nsPIDOMWindowInner* aWindow,
AudioNode* aNode,
MediaStreamGraph* aGraph);
protected:
~DOMAudioNodeMediaStream();
private:
// If this object wraps a stream owned by an AudioNode, we need to ensure that
// the node isn't cycle-collected too early.
RefPtr<AudioNode> mStreamNode;
};
} // namespace mozilla
#endif /* NSDOMMEDIASTREAM_H_ */
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