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jsep.h
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jsep.h
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/*
* libjingle
* Copyright 2012, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
// Interfaces matching the JSEP proposal.
// http://www.ietf.org/id/draft-uberti-rtcweb-jsep-02.txt
#ifndef TALK_APP_WEBRTC_JSEP_H_
#define TALK_APP_WEBRTC_JSEP_H_
#include <string>
#include <vector>
namespace cricket {
class SessionDescription;
class Candidate;
} // namespace cricket
namespace webrtc {
// Class used for describing what media a PeerConnection can receive.
class MediaHints {
public:
MediaHints() : has_audio_(true), has_video_(true) {}
MediaHints(bool receive_audio, bool receive_video)
: has_audio_(receive_audio),
has_video_(receive_video) {
}
// The peer wants to receive audio.
bool has_audio() const { return has_audio_; }
// The peer wants to receive video.
bool has_video() const { return has_video_; }
private:
bool has_audio_;
bool has_video_;
};
// Class representation of an ICE candidate.
class IceCandidateInterface {
public:
virtual ~IceCandidateInterface() {}
// The m= line this candidate is associated with.
virtual std::string label() const = 0;
virtual const cricket::Candidate& candidate() const = 0;
// Creates a SDP-ized form of this candidate.
virtual bool ToString(std::string* out) const = 0;
};
// Creates a IceCandidateInterface based on SDP string.
// Returns NULL if the sdp string can't be parsed.
IceCandidateInterface* CreateIceCandidate(const std::string& label,
const std::string& sdp);
// Class representation of a Session description.
class SessionDescriptionInterface {
public:
virtual ~SessionDescriptionInterface() {}
virtual const cricket::SessionDescription* description() const = 0;
// Release ownership of cricket::SessionDescription.
virtual cricket::SessionDescription* ReleaseDescription() = 0;
// Adds the specified candidate to the description.
// Ownership is not transferred.
virtual void AddCandidate(const IceCandidateInterface* candidate) = 0;
// Serializes the description to SDP.
virtual bool ToString(std::string* out) const = 0;
};
// Creates a SessionDescriptionInterface based on SDP string.
// Returns NULL if the sdp string can't be parsed.
SessionDescriptionInterface* CreateSessionDescription(const std::string& sdp);
// Jsep Ice candidate callback interface. An application should implement these
// methods to be notified of new local candidates.
class IceCandidateObserver {
public:
// New Ice candidate have been found.
virtual void OnIceCandidate(const IceCandidateInterface* candidate) = 0;
// All Ice candidates have been found.
virtual void OnIceComplete() = 0;
protected:
~IceCandidateObserver() {}
};
// Interface for implementing Jsep. PeerConnection implements these functions.
class JsepInterface {
public:
enum Action {
kOffer,
kAnswer,
};
virtual SessionDescriptionInterface* CreateOffer(const MediaHints& hints) = 0;
// Create an answer to an offer. Returns NULL if an answer can't be created.
virtual SessionDescriptionInterface* CreateAnswer(
const MediaHints& hints,
const SessionDescriptionInterface* offer) = 0;
// Sets the local session description.
// JsepInterface take ownership of |desc|.
virtual bool SetLocalDescription(Action action,
SessionDescriptionInterface* desc) = 0;
// Sets the remote session description.
// JsepInterface take ownership of |desc|.
virtual bool SetRemoteDescription(Action action,
SessionDescriptionInterface* desc) = 0;
// Processes received ICE information.
virtual bool ProcessIceMessage(
const IceCandidateInterface* ice_candidate) = 0;
virtual const SessionDescriptionInterface* local_description() const = 0;
virtual const SessionDescriptionInterface* remote_description() const = 0;
protected:
~JsepInterface() {}
};
} // namespace webrtc
#endif // TALK_APP_WEBRTC_JSEP_H_