PeerConnectionBackend.h   [plain text]

/*
 * Copyright (C) 2015 Ericsson AB. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in the documentation and/or other materials provided with the
 *    distribution.
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 *    may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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#pragma once

#if ENABLE(WEB_RTC)

#include "JSDOMPromise.h"
#include "PeerConnectionStates.h"

namespace WebCore {

class MediaStream;
class MediaStreamTrack;
class PeerConnectionBackend;
class RTCDataChannelHandler;
class RTCIceCandidate;
class RTCPeerConnection;
class RTCRtpReceiver;
class RTCRtpSender;
class RTCSessionDescription;
class RTCStatsResponse;

struct MediaEndpointConfiguration;
struct RTCAnswerOptions;
struct RTCDataChannelInit;
struct RTCOfferOptions;

namespace PeerConnection {
using SessionDescriptionPromise = DOMPromise<IDLInterface<RTCSessionDescription>>;
using StatsPromise = DOMPromise<IDLInterface<RTCStatsResponse>>;
}

using CreatePeerConnectionBackend = std::unique_ptr<PeerConnectionBackend> (*)(RTCPeerConnection&);

// FIXME: What is the value of this abstract class? There is only one concrete class derived from it.
class PeerConnectionBackend {
public:
    WEBCORE_EXPORT static CreatePeerConnectionBackend create;

    PeerConnectionBackend(RTCPeerConnection& peerConnection) : m_peerConnection(peerConnection) { }
    virtual ~PeerConnectionBackend() { }

    void createOffer(RTCOfferOptions&&, PeerConnection::SessionDescriptionPromise&&);
    void createAnswer(RTCAnswerOptions&&, PeerConnection::SessionDescriptionPromise&&);
    void setLocalDescription(RTCSessionDescription&, DOMPromise<void>&&);
    void setRemoteDescription(RTCSessionDescription&, DOMPromise<void>&&);
    void addIceCandidate(RTCIceCandidate&, DOMPromise<void>&&);

    virtual std::unique_ptr<RTCDataChannelHandler> createDataChannelHandler(const String&, const RTCDataChannelInit&) = 0;

    void stop();

    virtual RefPtr<RTCSessionDescription> localDescription() const = 0;
    virtual RefPtr<RTCSessionDescription> currentLocalDescription() const = 0;
    virtual RefPtr<RTCSessionDescription> pendingLocalDescription() const = 0;

    virtual RefPtr<RTCSessionDescription> remoteDescription() const = 0;
    virtual RefPtr<RTCSessionDescription> currentRemoteDescription() const = 0;
    virtual RefPtr<RTCSessionDescription> pendingRemoteDescription() const = 0;

    virtual void setConfiguration(MediaEndpointConfiguration&&) = 0;

    virtual void getStats(MediaStreamTrack*, PeerConnection::StatsPromise&&) = 0;

    virtual Vector<RefPtr<MediaStream>> getRemoteStreams() const = 0;

    virtual Ref<RTCRtpReceiver> createReceiver(const String& transceiverMid, const String& trackKind, const String& trackId) = 0;
    virtual void replaceTrack(RTCRtpSender&, RefPtr<MediaStreamTrack>&&, DOMPromise<void>&&) = 0;

    virtual bool isNegotiationNeeded() const = 0;
    virtual void markAsNeedingNegotiation() = 0;
    virtual void clearNegotiationNeededState() = 0;

    virtual void emulatePlatformEvent(const String& action) = 0;

protected:
    void fireICECandidateEvent(RefPtr<RTCIceCandidate>&&);
    void doneGatheringCandidates();

    void updateSignalingState(PeerConnectionStates::SignalingState);

    void createOfferSucceeded(String&&);
    void createOfferFailed(Exception&&);

    void createAnswerSucceeded(String&&);
    void createAnswerFailed(Exception&&);

    void setLocalDescriptionSucceeded();
    void setLocalDescriptionFailed(Exception&&);

    void setRemoteDescriptionSucceeded();
    void setRemoteDescriptionFailed(Exception&&);

    void addIceCandidateSucceeded();
    void addIceCandidateFailed(Exception&&);

private:
    virtual void doCreateOffer(RTCOfferOptions&&) = 0;
    virtual void doCreateAnswer(RTCAnswerOptions&&) = 0;
    virtual void doSetLocalDescription(RTCSessionDescription&) = 0;
    virtual void doSetRemoteDescription(RTCSessionDescription&) = 0;
    virtual void doAddIceCandidate(RTCIceCandidate&) = 0;
    virtual void doStop() = 0;

protected:
    RTCPeerConnection& m_peerConnection;

private:
    std::optional<PeerConnection::SessionDescriptionPromise> m_offerAnswerPromise;
    std::optional<DOMPromise<void>> m_setDescriptionPromise;
    std::optional<DOMPromise<void>> m_addIceCandidatePromise;
};

} // namespace WebCore

#endif // ENABLE(WEB_RTC)