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/*
* Copyright 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
// Interfaces matching the draft-ietf-rtcweb-jsep-01.
#ifndef WEBRTC_API_JSEP_H_
#define WEBRTC_API_JSEP_H_
#include <string>
#include <vector>
#include "webrtc/base/basictypes.h"
#include "webrtc/base/refcount.h"
namespace cricket {
class Candidate;
class SessionDescription;
} // namespace cricket
namespace webrtc {
struct SdpParseError {
public:
// The sdp line that causes the error.
std::string line;
// Explains the error.
std::string description;
};
// Class representation of an ICE candidate.
// An instance of this interface is supposed to be owned by one class at
// a time and is therefore not expected to be thread safe.
class IceCandidateInterface {
public:
virtual ~IceCandidateInterface() {}
/// If present, this contains the identierfier of the "media stream
// identification" as defined in [RFC 3388] for m-line this candidate is
// assocated with.
virtual std::string sdp_mid() const = 0;
// This indeicates the index (starting at zero) of m-line in the SDP this
// candidate is assocated with.
virtual int sdp_mline_index() 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.
// |error| can be NULL if doesn't care about the failure reason.
IceCandidateInterface* CreateIceCandidate(const std::string& sdp_mid,
int sdp_mline_index,
const std::string& sdp,
SdpParseError* error);
// This class represents a collection of candidates for a specific m-line.
// This class is used in SessionDescriptionInterface to represent all known
// candidates for a certain m-line.
class IceCandidateCollection {
public:
virtual ~IceCandidateCollection() {}
virtual size_t count() const = 0;
// Returns true if an equivalent |candidate| exist in the collection.
virtual bool HasCandidate(const IceCandidateInterface* candidate) const = 0;
virtual const IceCandidateInterface* at(size_t index) const = 0;
};
// Class representation of a Session description.
// An instance of this interface is supposed to be owned by one class at
// a time and is therefore not expected to be thread safe.
class SessionDescriptionInterface {
public:
// Supported types:
static const char kOffer[];
static const char kPrAnswer[];
static const char kAnswer[];
virtual ~SessionDescriptionInterface() {}
virtual cricket::SessionDescription* description() = 0;
virtual const cricket::SessionDescription* description() const = 0;
// Get the session id and session version, which are defined based on
// RFC 4566 for the SDP o= line.
virtual std::string session_id() const = 0;
virtual std::string session_version() const = 0;
virtual std::string type() const = 0;
// Adds the specified candidate to the description.
// Ownership is not transferred.
// Returns false if the session description does not have a media section that
// corresponds to the |candidate| label.
virtual bool AddCandidate(const IceCandidateInterface* candidate) = 0;
// Removes the candidates from the description.
// Returns the number of candidates removed.
virtual size_t RemoveCandidates(
const std::vector<cricket::Candidate>& candidates) { return 0; }
// Returns the number of m- lines in the session description.
virtual size_t number_of_mediasections() const = 0;
// Returns a collection of all candidates that belong to a certain m-line
virtual const IceCandidateCollection* candidates(
size_t mediasection_index) const = 0;
// Serializes the description to SDP.
virtual bool ToString(std::string* out) const = 0;
};
// Creates a SessionDescriptionInterface based on SDP string and the type.
// Returns NULL if the sdp string can't be parsed or the type is unsupported.
// |error| can be NULL if doesn't care about the failure reason.
SessionDescriptionInterface* CreateSessionDescription(const std::string& type,
const std::string& sdp,
SdpParseError* error);
// Jsep CreateOffer and CreateAnswer callback interface.
class CreateSessionDescriptionObserver : public rtc::RefCountInterface {
public:
// The implementation of the CreateSessionDescriptionObserver takes
// the ownership of the |desc|.
virtual void OnSuccess(SessionDescriptionInterface* desc) = 0;
virtual void OnFailure(const std::string& error) = 0;
protected:
~CreateSessionDescriptionObserver() {}
};
// Jsep SetLocalDescription and SetRemoteDescription callback interface.
class SetSessionDescriptionObserver : public rtc::RefCountInterface {
public:
virtual void OnSuccess() = 0;
virtual void OnFailure(const std::string& error) = 0;
protected:
~SetSessionDescriptionObserver() {}
};
} // namespace webrtc
#endif // WEBRTC_API_JSEP_H_
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