media/mtransport/nricectx.h
author EKR <ekr@rtfm.com>
Tue, 02 Oct 2012 13:04:58 -0700
changeset 109560 a8fac69129b0bac8b55e33574f4c4338d494b150
child 110167 637ab1786ee16c9a22986b0f574fb8d4023fb54d
permissions -rw-r--r--
Bug 790517: mtransport - Generic media transport subsystem for ICE and DTLS r=jesup,bsmith,mcmanus

/* -*- 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/. */

// Original author: ekr@rtfm.com

// Some of this code is cut-and-pasted from nICEr. Copyright is:

/*
Copyright (c) 2007, Adobe Systems, Incorporated
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
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* Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.

* 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.

* Neither the name of Adobe Systems, Network Resonance nor the names of its
  contributors may be used to endorse or promote products derived from
  this software without specific prior written permission.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/* 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/. */

// Original author: ekr@rtfm.com

// This is a wrapper around the nICEr ICE stack
#ifndef nricectx_h__
#define nricectx_h__

#include <vector>

#include "sigslot.h"

#include "mozilla/RefPtr.h"
#include "mozilla/Scoped.h"
#include "nsAutoPtr.h"
#include "nsIEventTarget.h"
#include "nsITimer.h"

#include "m_cpp_utils.h"

namespace mozilla {

typedef void* NR_SOCKET;
typedef struct nr_ice_ctx_ nr_ice_ctx;
typedef struct nr_ice_peer_ctx_ nr_ice_peer_ctx;
typedef struct nr_ice_media_stream_ nr_ice_media_stream;
typedef struct nr_ice_handler_ nr_ice_handler;
typedef struct nr_ice_handler_vtbl_ nr_ice_handler_vtbl;
typedef struct nr_ice_cand_pair_ nr_ice_cand_pair;

class NrIceMediaStream;

class NrIceCtx {
 public:
  enum State { ICE_CTX_INIT,
               ICE_CTX_GATHERING,
               ICE_CTX_GATHERED,
               ICE_CTX_CHECKING,
               ICE_CTX_OPEN,
               ICE_CTX_FAILED
  };

  static RefPtr<NrIceCtx> Create(const std::string& name,
                                          bool offerer,
                                          bool set_interface_priorities = true);
  virtual ~NrIceCtx();

  nr_ice_ctx *ctx() { return ctx_; }
  nr_ice_peer_ctx *peer() { return peer_; }

  // Create a media stream
  RefPtr<NrIceMediaStream> CreateStream(const std::string& name,
                                                 int components);

  // The name of the ctx
  const std::string& name() const { return name_; }

  // Current state
  State state() const { return state_; }

  // Get the global attributes
  std::vector<std::string> GetGlobalAttributes();

  // Set the other side's global attributes
  nsresult ParseGlobalAttributes(std::vector<std::string> attrs);

  // Start ICE gathering
  nsresult StartGathering();

  // Start checking
  nsresult StartChecks();

  // Finalize the ICE negotiation. I.e., there will be no
  // more forking.
  nsresult Finalize();

  // Signals to indicate events. API users can (and should)
  // register for these.
  sigslot::signal1<NrIceCtx *> SignalGatheringCompleted;  // Done gathering
  sigslot::signal1<NrIceCtx *> SignalCompleted;  // Done handshaking

  // The thread to direct method calls to
  nsCOMPtr<nsIEventTarget> thread() { return sts_target_; }

  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(NrIceCtx);

 private:
  NrIceCtx(const std::string& name, bool offerer)
      : state_(ICE_CTX_INIT),
      name_(name),
      offerer_(offerer),
      streams_(),
      ctx_(nullptr),
      peer_(nullptr),
      ice_handler_vtbl_(nullptr),
      ice_handler_(nullptr) {}

  DISALLOW_COPY_ASSIGN(NrIceCtx);

  // Callbacks for nICEr
  static void initialized_cb(NR_SOCKET s, int h, void *arg);  // ICE initialized

  // Handler implementation
  static int select_pair(void *obj,nr_ice_media_stream *stream,
                         int component_id, nr_ice_cand_pair **potentials,
                         int potential_ct);
  static int stream_ready(void *obj, nr_ice_media_stream *stream);
  static int stream_failed(void *obj, nr_ice_media_stream *stream);
  static int ice_completed(void *obj, nr_ice_peer_ctx *pctx);
  static int msg_recvd(void *obj, nr_ice_peer_ctx *pctx,
                       nr_ice_media_stream *stream, int component_id,
                       unsigned char *msg, int len);

  // Iterate through all media streams and emit the candidates
  // Note that we don't do trickle ICE yet
  void EmitAllCandidates();

  // Find a media stream by stream ptr. Gross
  RefPtr<NrIceMediaStream> FindStream(nr_ice_media_stream *stream);

  // Set the state
  void SetState(State state);

  State state_;
  const std::string name_;
  bool offerer_;
  std::vector<RefPtr<NrIceMediaStream> > streams_;
  nr_ice_ctx *ctx_;
  nr_ice_peer_ctx *peer_;
  nr_ice_handler_vtbl* ice_handler_vtbl_;  // Must be pointer
  nr_ice_handler* ice_handler_;  // Must be pointer
  nsCOMPtr<nsIEventTarget> sts_target_; // The thread to run on
};


}  // close namespace
#endif