gecko-dev/dom/media/DOMMediaStream.h
2014-12-17 18:03:34 +01:00

391 lines
13 KiB
C++

/* -*- 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 "nsCycleCollectionParticipant.h"
#include "nsWrapperCache.h"
#include "StreamBuffer.h"
#include "nsIDOMWindow.h"
#include "nsIPrincipal.h"
#include "mozilla/PeerIdentity.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/CORSMode.h"
class nsXPCClassInfo;
// GetCurrentTime is defined in winbase.h as zero argument macro forwarding to
// GetTickCount() and conflicts with NS_DECL_NSIDOMMEDIASTREAM, containing
// currentTime getter.
#ifdef GetCurrentTime
#undef GetCurrentTime
#endif
// X11 has a #define for CurrentTime. Unbelievable :-(.
// See dom/media/webaudio/AudioContext.h for more fun!
#ifdef CurrentTime
#undef CurrentTime
#endif
namespace mozilla {
class DOMLocalMediaStream;
class MediaStream;
class MediaEngineSource;
namespace dom {
class AudioNode;
class MediaStreamTrack;
class AudioStreamTrack;
class VideoStreamTrack;
class AudioTrack;
class VideoTrack;
class AudioTrackList;
class VideoTrackList;
class MediaTrackListListener;
}
class MediaStreamDirectListener;
// For classes that need fixed track IDs
enum {
kVideoTrack = 1,
kAudioTrack = 2,
kTrackCount
};
#define NS_DOMMEDIASTREAM_IID \
{ 0x8cb65468, 0x66c0, 0x444e, \
{ 0x89, 0x9f, 0x89, 0x1d, 0x9e, 0xd2, 0xbe, 0x7c } }
/**
* DOM wrapper for MediaStreams.
*/
class DOMMediaStream : public DOMEventTargetHelper
{
friend class DOMLocalMediaStream;
typedef dom::MediaStreamTrack MediaStreamTrack;
typedef dom::AudioStreamTrack AudioStreamTrack;
typedef dom::VideoStreamTrack VideoStreamTrack;
typedef dom::AudioTrack AudioTrack;
typedef dom::VideoTrack VideoTrack;
typedef dom::AudioTrackList AudioTrackList;
typedef dom::VideoTrackList VideoTrackList;
typedef dom::MediaTrackListListener MediaTrackListListener;
public:
typedef uint8_t TrackTypeHints;
DOMMediaStream();
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)
nsIDOMWindow* GetParentObject() const
{
return mWindow;
}
virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE;
// WebIDL
double CurrentTime();
void GetAudioTracks(nsTArray<nsRefPtr<AudioStreamTrack> >& aTracks);
void GetVideoTracks(nsTArray<nsRefPtr<VideoStreamTrack> >& aTracks);
void GetTracks(nsTArray<nsRefPtr<MediaStreamTrack> >& aTracks);
bool HasTrack(const MediaStreamTrack& aTrack) const;
MediaStream* GetStream() const { return mStream; }
/**
* Overridden in DOMLocalMediaStreams to allow getUserMedia to pass
* data directly to RTCPeerConnection without going through graph queuing.
* Returns a bool to let us know if direct data will be delivered.
*/
virtual bool AddDirectListener(MediaStreamDirectListener *aListener) { return false; }
virtual void RemoveDirectListener(MediaStreamDirectListener *aListener) {}
/**
* Overridden in DOMLocalMediaStreams to allow getUserMedia to disable
* media at the SourceMediaStream.
*/
virtual void SetTrackEnabled(TrackID aTrackID, bool aEnabled);
virtual void StopTrack(TrackID aTrackID);
virtual DOMLocalMediaStream* AsDOMLocalMediaStream() { return nullptr; }
bool IsFinished();
/**
* 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; }
mozilla::CORSMode GetCORSMode();
void SetCORSMode(mozilla::CORSMode aCORSMode);
/**
* These are used in WebRTC. A peerIdentity constrained MediaStream cannot be sent
* across the network to anything other than a peer with the provided identity.
* If this is set, then mPrincipal should be an instance of nsNullPrincipal.
*/
PeerIdentity* GetPeerIdentity() const { return mPeerIdentity; }
void SetPeerIdentity(PeerIdentity* aPeerIdentity)
{
mPeerIdentity = aPeerIdentity;
}
/**
* Indicate that data will be contributed to this stream from origin aPrincipal.
* If aPrincipal is null, this is ignored. Otherwise, from now on the contents
* of this stream can only be accessed by principals that subsume aPrincipal.
* Returns true if the stream's principal changed.
*/
bool CombineWithPrincipal(nsIPrincipal* aPrincipal);
/**
* This is used in WebRTC to move from a protected state (nsNullPrincipal) to
* one where the stream is accessible to script. Don't call this.
* CombineWithPrincipal is almost certainly more appropriate.
*/
void SetPrincipal(nsIPrincipal* aPrincipal);
/**
* Used to learn about dynamic changes in principal occur.
* Operations relating to these observers must be confined to the main thread.
*/
class PrincipalChangeObserver
{
public:
virtual void PrincipalChanged(DOMMediaStream* aMediaStream) = 0;
};
bool AddPrincipalChangeObserver(PrincipalChangeObserver* aObserver);
bool RemovePrincipalChangeObserver(PrincipalChangeObserver* aObserver);
/**
* Called when this stream's MediaStreamGraph has been shut down. Normally
* MSGs are only shut down when all streams have been removed, so this
* will only be called during a forced shutdown due to application exit.
*/
void NotifyMediaStreamGraphShutdown();
/**
* Called when the main-thread state of the MediaStream changed.
*/
void NotifyStreamStateChanged();
// Indicate what track types we eventually expect to add to this stream
enum {
HINT_CONTENTS_AUDIO = 1 << 0,
HINT_CONTENTS_VIDEO = 1 << 1,
HINT_CONTENTS_UNKNOWN = 1 << 2
};
TrackTypeHints GetHintContents() const { return mHintContents; }
void SetHintContents(TrackTypeHints aHintContents);
TrackTypeHints GetTrackTypesAvailable() const { return mTrackTypesAvailable; }
/**
* Create an nsDOMMediaStream whose underlying stream is a SourceMediaStream.
*/
static already_AddRefed<DOMMediaStream>
CreateSourceStream(nsIDOMWindow* aWindow, TrackTypeHints aHintContents);
/**
* Create an nsDOMMediaStream whose underlying stream is a TrackUnionStream.
*/
static already_AddRefed<DOMMediaStream>
CreateTrackUnionStream(nsIDOMWindow* aWindow, TrackTypeHints aHintContents = 0);
void SetLogicalStreamStartTime(StreamTime aTime)
{
mLogicalStreamStartTime = aTime;
}
// Notifications from StreamListener.
// BindDOMTrack should only be called when it's safe to run script.
MediaStreamTrack* BindDOMTrack(TrackID aTrackID, MediaSegment::Type aType);
MediaStreamTrack* CreateDOMTrack(TrackID aTrackID, MediaSegment::Type aType);
MediaStreamTrack* GetDOMTrackFor(TrackID aTrackID);
class OnTracksAvailableCallback {
public:
explicit OnTracksAvailableCallback(uint8_t aExpectedTracks = 0)
: mExpectedTracks(aExpectedTracks) {}
virtual ~OnTracksAvailableCallback() {}
virtual void NotifyTracksAvailable(DOMMediaStream* aStream) = 0;
TrackTypeHints GetExpectedTracks() { return mExpectedTracks; }
void SetExpectedTracks(TrackTypeHints aExpectedTracks) { mExpectedTracks = aExpectedTracks; }
private:
TrackTypeHints mExpectedTracks;
};
// When one track of the appropriate type has been added for each bit set
// in aCallback->GetExpectedTracks(), 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.
// If GetExpectedTracks() returns 0, the callback will be fired as soon as there are any tracks.
void OnTracksAvailable(OnTracksAvailableCallback* aCallback);
/**
* Add an nsISupports object that this stream will keep alive as long as
* the stream is not finished.
*/
void AddConsumerToKeepAlive(nsISupports* aConsumer)
{
if (!IsFinished() && !mNotifiedOfMediaStreamGraphShutdown) {
mConsumersToKeepAlive.AppendElement(aConsumer);
}
}
/**
* If loading and playing a MediaStream in a media element, for each
* MediaStreamTrack in the MediaStream, create a corresponding AudioTrack or
* VideoTrack during the phase of resource fetching.
*/
void ConstructMediaTracks(AudioTrackList* aAudioTrackList,
VideoTrackList* aVideoTrackList);
/**
* MUST call this before the AudioTrackList or VideoTrackList go away
*/
void DisconnectTrackListListeners(const AudioTrackList* aAudioTrackList,
const VideoTrackList* aVideoTrackList);
virtual void NotifyMediaStreamTrackCreated(MediaStreamTrack* aTrack);
virtual void NotifyMediaStreamTrackEnded(MediaStreamTrack* aTrack);
protected:
virtual ~DOMMediaStream();
void Destroy();
void InitSourceStream(nsIDOMWindow* aWindow, TrackTypeHints aHintContents);
void InitTrackUnionStream(nsIDOMWindow* aWindow, TrackTypeHints aHintContents);
void InitStreamCommon(MediaStream* aStream);
already_AddRefed<AudioTrack> CreateAudioTrack(AudioStreamTrack* aStreamTrack);
already_AddRefed<VideoTrack> CreateVideoTrack(VideoStreamTrack* aStreamTrack);
void CheckTracksAvailable();
class StreamListener;
friend class StreamListener;
// StreamTime at which the currentTime attribute would return 0.
StreamTime mLogicalStreamStartTime;
// We need this to track our parent object.
nsCOMPtr<nsIDOMWindow> mWindow;
// MediaStream is owned by the graph, but we tell it when to die, and it won't
// die until we let it.
MediaStream* mStream;
nsAutoTArray<nsRefPtr<MediaStreamTrack>,2> mTracks;
nsRefPtr<StreamListener> mListener;
nsTArray<nsAutoPtr<OnTracksAvailableCallback> > mRunOnTracksAvailable;
// Keep these alive until the stream finishes
nsTArray<nsCOMPtr<nsISupports> > mConsumersToKeepAlive;
// Indicate what track types we eventually expect to add to this stream
uint8_t mHintContents;
// Indicate what track types have arrived in this stream
uint8_t mTrackTypesAvailable;
bool mNotifiedOfMediaStreamGraphShutdown;
// Send notifications to AudioTrackList or VideoTrackList, if this MediaStream
// is consumed by a HTMLMediaElement.
nsTArray<MediaTrackListListener> mMediaTrackListListeners;
private:
void NotifyPrincipalChanged();
// Principal identifying who may access the contents of this stream.
// If null, this stream can be used by anyone because it has no content yet.
nsCOMPtr<nsIPrincipal> mPrincipal;
nsTArray<PrincipalChangeObserver*> mPrincipalChangeObservers;
// this is used in gUM and WebRTC to identify peers that this stream
// is allowed to be sent to
nsAutoPtr<PeerIdentity> mPeerIdentity;
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:
DOMLocalMediaStream() {}
NS_DECL_ISUPPORTS_INHERITED
NS_DECLARE_STATIC_IID_ACCESSOR(NS_DOMLOCALMEDIASTREAM_IID)
virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE;
virtual void Stop();
virtual MediaEngineSource* GetMediaEngine(TrackID aTrackID) { return nullptr; }
/**
* Create an nsDOMLocalMediaStream whose underlying stream is a SourceMediaStream.
*/
static already_AddRefed<DOMLocalMediaStream>
CreateSourceStream(nsIDOMWindow* aWindow, TrackTypeHints aHintContents);
/**
* Create an nsDOMLocalMediaStream whose underlying stream is a TrackUnionStream.
*/
static already_AddRefed<DOMLocalMediaStream>
CreateTrackUnionStream(nsIDOMWindow* aWindow, TrackTypeHints aHintContents = 0);
protected:
virtual ~DOMLocalMediaStream();
};
NS_DEFINE_STATIC_IID_ACCESSOR(DOMLocalMediaStream,
NS_DOMLOCALMEDIASTREAM_IID)
class DOMAudioNodeMediaStream : public DOMMediaStream
{
typedef dom::AudioNode AudioNode;
public:
explicit DOMAudioNodeMediaStream(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>
CreateTrackUnionStream(nsIDOMWindow* aWindow,
AudioNode* aNode,
TrackTypeHints aHintContents = 0);
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.
nsRefPtr<AudioNode> mStreamNode;
};
}
#endif /* NSDOMMEDIASTREAM_H_ */