gecko-dev/content/media/nsDOMMediaStream.h

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3.7 KiB
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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 "nsIDOMMediaStream.h"
#include "MediaStreamGraph.h"
#include "nsCycleCollectionParticipant.h"
#include "nsIPrincipal.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
/**
* DOM wrapper for MediaStreams.
*/
class nsDOMMediaStream : public nsIDOMMediaStream
{
friend class nsDOMLocalMediaStream;
typedef mozilla::MediaStream MediaStream;
public:
nsDOMMediaStream() : mStream(nullptr), mHintContents(0) {}
virtual ~nsDOMMediaStream();
NS_DECL_CYCLE_COLLECTION_CLASS(nsDOMMediaStream)
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_NSIDOMMEDIASTREAM
MediaStream* GetStream() { return mStream; }
bool IsFinished() { return !mStream || mStream->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; }
/**
* 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);
/**
* Create an nsDOMMediaStream whose underlying stream is a SourceMediaStream.
*/
static already_AddRefed<nsDOMMediaStream> CreateSourceStream(uint32_t aHintContents);
// Hints to tell the SDP generator about whether this
// MediaStream probably has audio and/or video
enum {
HINT_CONTENTS_AUDIO = 0x00000001U,
HINT_CONTENTS_VIDEO = 0x00000002U
};
uint32_t GetHintContents() const { return mHintContents; }
void SetHintContents(uint32_t aHintContents) { mHintContents = aHintContents; }
/**
* Create an nsDOMMediaStream whose underlying stream is a TrackUnionStream.
*/
static already_AddRefed<nsDOMMediaStream> CreateTrackUnionStream();
protected:
// MediaStream is owned by the graph, but we tell it when to die, and it won't
// die until we let it.
MediaStream* mStream;
// 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;
// tells the SDP generator about whether this
// MediaStream probably has audio and/or video
uint32_t mHintContents;
};
class nsDOMLocalMediaStream : public nsDOMMediaStream,
public nsIDOMLocalMediaStream
{
public:
nsDOMLocalMediaStream() {}
virtual ~nsDOMLocalMediaStream() {}
NS_DECL_ISUPPORTS_INHERITED
NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(nsDOMLocalMediaStream, nsDOMMediaStream)
NS_DECL_NSIDOMLOCALMEDIASTREAM
NS_FORWARD_NSIDOMMEDIASTREAM(nsDOMMediaStream::)
/**
* Create an nsDOMLocalMediaStream whose underlying stream is a SourceMediaStream.
*/
static already_AddRefed<nsDOMLocalMediaStream> CreateSourceStream(uint32_t aHintContents);
/**
* Create an nsDOMLocalMediaStream whose underlying stream is a TrackUnionStream.
*/
static already_AddRefed<nsDOMLocalMediaStream> CreateTrackUnionStream();
};
#endif /* NSDOMMEDIASTREAM_H_ */