SdpHelper.h - mozsearch

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=2 et sw=2 tw=80: */

/* 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 _SDPHELPER_H_

#define _SDPHELPER_H_

#include "nsError.h"

#include "sdp/SdpMediaSection.h"

#include "sdp/SdpAttribute.h"

#include "transport/m_cpp_utils.h"

#include <string>

#include <map>

#include <vector>

namespace mozilla {

class SdpMediaSection;

class Sdp;

class SdpHelper {

 public:

  // Takes a std::string* into which error strings will be written for the

  // lifetime of the SdpHelper.

  explicit SdpHelper(std::string* errorDest) : mLastError(*errorDest) {}

  ~SdpHelper() {}

  nsresult GetComponent(const std::string& candidate, size_t* component);

  nsresult CopyTransportParams(size_t numComponents,

                               const SdpMediaSection& source,

                               SdpMediaSection* dest);

  bool AreOldTransportParamsValid(const Sdp& oldAnswer,

                                  const Sdp& offerersPreviousSdp,

                                  const Sdp& newOffer, size_t level);

  bool IceCredentialsDiffer(const SdpMediaSection& msection1,

                            const SdpMediaSection& msection2);

  bool MsectionIsDisabled(const SdpMediaSection& msection) const;

  static void DisableMsection(Sdp* sdp, SdpMediaSection* msection);

  // Maps each mid to the m-section that owns its bundle transport.

  // Mids that do not appear in an a=group:BUNDLE do not appear here.

  typedef std::map<std::string, const SdpMediaSection*> BundledMids;

  nsresult GetBundledMids(const Sdp& sdp, BundledMids* bundledMids);

  bool OwnsTransport(const Sdp& localSdp, uint16_t level, sdp::SdpType type);

  bool OwnsTransport(const SdpMediaSection& msection,

                     const BundledMids& bundledMids, sdp::SdpType type);

  void GetBundleGroups(const Sdp& sdp,

                       std::vector<SdpGroupAttributeList::Group>* groups) const;

  nsresult GetMidFromLevel(const Sdp& sdp, uint16_t level, std::string* mid);

  nsresult GetIdsFromMsid(const Sdp& sdp, const SdpMediaSection& msection,

                          std::vector<std::string>* streamId);

  nsresult GetMsids(const SdpMediaSection& msection,

                    std::vector<SdpMsidAttributeList::Msid>* msids);

  nsresult ParseMsid(const std::string& msidAttribute, std::string* streamId,

                     std::string* trackId);

  nsresult AddCandidateToSdp(Sdp* sdp, const std::string& candidate,

                             uint16_t level, const std::string& ufrag);

  nsresult SetIceGatheringComplete(Sdp* sdp, const std::string& ufrag);

  nsresult SetIceGatheringComplete(Sdp* sdp, uint16_t level,

                                   const std::string& ufrag);

  void SetDefaultAddresses(const std::string& defaultCandidateAddr,

                           uint16_t defaultCandidatePort,

                           const std::string& defaultRtcpCandidateAddr,

                           uint16_t defaultRtcpCandidatePort,

                           SdpMediaSection* msection);

  void SetupMsidSemantic(const std::vector<std::string>& msids, Sdp* sdp) const;

  std::string GetCNAME(const SdpMediaSection& msection) const;

  SdpMediaSection* FindMsectionByMid(Sdp& sdp, const std::string& mid) const;

  const SdpMediaSection* FindMsectionByMid(const Sdp& sdp,

                                           const std::string& mid) const;

  nsresult CopyStickyParams(const SdpMediaSection& source,

                            SdpMediaSection* dest);

  bool HasRtcp(SdpMediaSection::Protocol proto) const;

  static SdpMediaSection::Protocol GetProtocolForMediaType(

      SdpMediaSection::MediaType type);

  void AppendSdpParseErrors(

      const std::vector<std::pair<size_t, std::string> >& aErrors,

      std::string* aErrorString);

  static bool GetPtAsInt(const std::string& ptString, uint16_t* ptOutparam);

  void NegotiateAndAddExtmaps(

      const SdpMediaSection& remoteMsection,

      std::vector<SdpExtmapAttributeList::Extmap>& localExtensions,

      SdpMediaSection* localMsection);

  bool SdpMatch(const Sdp& sdp1, const Sdp& sdp2);

  nsresult ValidateTransportAttributes(const Sdp& aSdp, sdp::SdpType aType);

 private:

  std::string& mLastError;

  DISALLOW_COPY_ASSIGN(SdpHelper);

};

}  // namespace mozilla

#endif  // _SDPHELPER_H_