Revert of Separating SCTP code from BaseChannel/MediaChannel.

webrtc/media/sctp/sctpdataengine.h

Index: webrtc/media/sctp/sctpdataengine.h
diff --git a/webrtc/media/sctp/sctpdataengine.h b/webrtc/media/sctp/sctpdataengine.h
new file mode 100644
index 0000000000000000000000000000000000000000..8b6f37d6baa830431e30fd7381013a027fac1f35
--- /dev/null
+++ b/webrtc/media/sctp/sctpdataengine.h
@@ -0,0 +1,250 @@
+/*
+ *  Copyright (c) 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.
+ */
+
+#ifndef WEBRTC_MEDIA_SCTP_SCTPDATAENGINE_H_
+#define WEBRTC_MEDIA_SCTP_SCTPDATAENGINE_H_
+
+#include <errno.h>
+#include <string>
+#include <vector>
+
+namespace cricket {
+// Some ERRNO values get re-#defined to WSA* equivalents in some talk/
+// headers.  We save the original ones in an enum.
+enum PreservedErrno {
+  SCTP_EINPROGRESS = EINPROGRESS,
+  SCTP_EWOULDBLOCK = EWOULDBLOCK
+};
+}  // namespace cricket
+
+#include "webrtc/base/copyonwritebuffer.h"
+#include "webrtc/base/gtest_prod_util.h"
+#include "webrtc/media/base/codec.h"
+#include "webrtc/media/base/mediachannel.h"
+#include "webrtc/media/base/mediaengine.h"
+
+// Defined by "usrsctplib/usrsctp.h"
+struct sockaddr_conn;
+struct sctp_assoc_change;
+struct sctp_stream_reset_event;
+// Defined by <sys/socket.h>
+struct socket;
+namespace cricket {
+// The number of outgoing streams that we'll negotiate. Since stream IDs (SIDs)
+// are 0-based, the highest usable SID is 1023.
+//
+// It's recommended to use the maximum of 65535 in:
+// https://tools.ietf.org/html/draft-ietf-rtcweb-data-channel-13#section-6.2
+// However, we use 1024 in order to save memory. usrsctp allocates 104 bytes
+// for each pair of incoming/outgoing streams (on a 64-bit system), so 65535
+// streams would waste ~6MB.
+//
+// Note: "max" and "min" here are inclusive.
+constexpr uint16_t kMaxSctpStreams = 1024;
+constexpr uint16_t kMaxSctpSid = kMaxSctpStreams - 1;
+constexpr uint16_t kMinSctpSid = 0;
+
+// This is the default SCTP port to use. It is passed along the wire and the
+// connectee and connector must be using the same port. It is not related to the
+// ports at the IP level. (Corresponds to: sockaddr_conn.sconn_port in
+// usrsctp.h)
+const int kSctpDefaultPort = 5000;
+
+class SctpDataMediaChannel;
+
+// A DataEngine that interacts with usrsctp.
+//
+// From channel calls, data flows like this:
+// [worker thread (although it can in princple be another thread)]
+//  1.  SctpDataMediaChannel::SendData(data)
+//  2.  usrsctp_sendv(data)
+// [worker thread returns; sctp thread then calls the following]
+//  3.  OnSctpOutboundPacket(wrapped_data)
+// [sctp thread returns having posted a message for the worker thread]
+//  4.  SctpDataMediaChannel::OnMessage(wrapped_data)
+//  5.  SctpDataMediaChannel::OnPacketFromSctpToNetwork(wrapped_data)
+//  6.  NetworkInterface::SendPacket(wrapped_data)
+//  7.  ... across network ... a packet is sent back ...
+//  8.  SctpDataMediaChannel::OnPacketReceived(wrapped_data)
+//  9.  usrsctp_conninput(wrapped_data)
+// [worker thread returns; sctp thread then calls the following]
+//  10.  OnSctpInboundData(data)
+// [sctp thread returns having posted a message fot the worker thread]
+//  11. SctpDataMediaChannel::OnMessage(inboundpacket)
+//  12. SctpDataMediaChannel::OnInboundPacketFromSctpToChannel(inboundpacket)
+//  13. SctpDataMediaChannel::OnDataFromSctpToChannel(data)
+//  14. SctpDataMediaChannel::SignalDataReceived(data)
+// [from the same thread, methods registered/connected to
+//  SctpDataMediaChannel are called with the recieved data]
+class SctpDataEngine : public DataEngineInterface, public sigslot::has_slots<> {
+ public:
+  SctpDataEngine();
+  ~SctpDataEngine() override;
+
+  DataMediaChannel* CreateChannel(DataChannelType data_channel_type,
+                                  const MediaConfig& config) override;
+  const std::vector<DataCodec>& data_codecs() override { return codecs_; }
+
+ private:
+  const std::vector<DataCodec> codecs_;
+};
+
+// TODO(ldixon): Make into a special type of TypedMessageData.
+// Holds data to be passed on to a channel.
+struct SctpInboundPacket;
+
+class SctpDataMediaChannel : public DataMediaChannel,
+                             public rtc::MessageHandler {
+ public:
+  // DataMessageType is used for the SCTP "Payload Protocol Identifier", as
+  // defined in http://tools.ietf.org/html/rfc4960#section-14.4
+  //
+  // For the list of IANA approved values see:
+  // http://www.iana.org/assignments/sctp-parameters/sctp-parameters.xml
+  // The value is not used by SCTP itself. It indicates the protocol running
+  // on top of SCTP.
+  enum PayloadProtocolIdentifier {
+    PPID_NONE = 0,  // No protocol is specified.
+    // Matches the PPIDs in mozilla source and
+    // https://datatracker.ietf.org/doc/draft-ietf-rtcweb-data-protocol Sec. 9
+    // They're not yet assigned by IANA.
+    PPID_CONTROL = 50,
+    PPID_BINARY_PARTIAL = 52,
+    PPID_BINARY_LAST = 53,
+    PPID_TEXT_PARTIAL = 54,
+    PPID_TEXT_LAST = 51
+  };
+
+  typedef std::set<uint32_t> StreamSet;
+
+  // Given a thread which will be used to post messages (received data) to this
+  // SctpDataMediaChannel instance.
+  explicit SctpDataMediaChannel(rtc::Thread* thread, const MediaConfig& config);
+  virtual ~SctpDataMediaChannel();
+
+  // When SetSend is set to true, connects. When set to false, disconnects.
+  // Calling: "SetSend(true); SetSend(false); SetSend(true);" will connect,
+  // disconnect, and reconnect.
+  virtual bool SetSend(bool send);
+  // Unless SetReceive(true) is called, received packets will be discarded.
+  virtual bool SetReceive(bool receive);
+
+  virtual bool SetSendParameters(const DataSendParameters& params);
+  virtual bool SetRecvParameters(const DataRecvParameters& params);
+  virtual bool AddSendStream(const StreamParams& sp);
+  virtual bool RemoveSendStream(uint32_t ssrc);
+  virtual bool AddRecvStream(const StreamParams& sp);
+  virtual bool RemoveRecvStream(uint32_t ssrc);
+
+  // Called when Sctp gets data. The data may be a notification or data for
+  // OnSctpInboundData. Called from the worker thread.
+  virtual void OnMessage(rtc::Message* msg);
+  // Send data down this channel (will be wrapped as SCTP packets then given to
+  // sctp that will then post the network interface by OnMessage).
+  // Returns true iff successful data somewhere on the send-queue/network.
+  virtual bool SendData(const SendDataParams& params,
+                        const rtc::CopyOnWriteBuffer& payload,
+                        SendDataResult* result = NULL);
+  // A packet is received from the network interface. Posted to OnMessage.
+  virtual void OnPacketReceived(rtc::CopyOnWriteBuffer* packet,
+                                const rtc::PacketTime& packet_time);
+
+  // Exposed to allow Post call from c-callbacks.
+  rtc::Thread* worker_thread() const { return worker_thread_; }
+
+  // Many of these things are unused by SCTP, but are needed to fulfill
+  // the MediaChannel interface.
+  virtual void OnRtcpReceived(rtc::CopyOnWriteBuffer* packet,
+                              const rtc::PacketTime& packet_time) {}
+  virtual void OnReadyToSend(bool ready) {}
+  virtual void OnTransportOverheadChanged(int transport_overhead_per_packet) {}
+
+  void OnSendThresholdCallback();
+  // Helper for debugging.
+  void set_debug_name_for_testing(const char* debug_name) {
+    debug_name_ = debug_name;
+  }
+  const struct socket* socket() const { return sock_; }
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(SctpDataMediaChannelTest, EngineSignalsRightChannel);
+  static int SendThresholdCallback(struct socket* sock, uint32_t sb_free);
+  static SctpDataMediaChannel* GetChannelFromSocket(struct socket* sock);
+
+ private:
+  sockaddr_conn GetSctpSockAddr(int port);
+
+  bool SetSendCodecs(const std::vector<DataCodec>& codecs);
+  bool SetRecvCodecs(const std::vector<DataCodec>& codecs);
+
+  // Creates the socket and connects. Sets sending_ to true.
+  bool Connect();
+  // Closes the socket. Sets sending_ to false.
+  void Disconnect();
+
+  // Returns false when openning the socket failed; when successfull sets
+  // sending_ to true
+  bool OpenSctpSocket();
+  // Sets sending_ to false and sock_ to NULL.
+  void CloseSctpSocket();
+
+  // Sends a SCTP_RESET_STREAM for all streams in closing_ssids_.
+  bool SendQueuedStreamResets();
+
+  // Adds a stream.
+  bool AddStream(const StreamParams &sp);
+  // Queues a stream for reset.
+  bool ResetStream(uint32_t ssrc);
+
+  // Called by OnMessage to send packet on the network.
+  void OnPacketFromSctpToNetwork(rtc::CopyOnWriteBuffer* buffer);
+  // Called by OnMessage to decide what to do with the packet.
+  void OnInboundPacketFromSctpToChannel(SctpInboundPacket* packet);
+  void OnDataFromSctpToChannel(const ReceiveDataParams& params,
+                               const rtc::CopyOnWriteBuffer& buffer);
+  void OnNotificationFromSctp(const rtc::CopyOnWriteBuffer& buffer);
+  void OnNotificationAssocChange(const sctp_assoc_change& change);
+
+  void OnStreamResetEvent(const struct sctp_stream_reset_event* evt);
+
+  // Responsible for marshalling incoming data to the channels listeners, and
+  // outgoing data to the network interface.
+  rtc::Thread* worker_thread_;
+  // The local and remote SCTP port to use. These are passed along the wire
+  // and the listener and connector must be using the same port. It is not
+  // related to the ports at the IP level.  If set to -1, we default to
+  // kSctpDefaultPort.
+  int local_port_;
+  int remote_port_;
+  struct socket* sock_;  // The socket created by usrsctp_socket(...).
+
+  // sending_ is true iff there is a connected socket.
+  bool sending_;
+  // receiving_ controls whether inbound packets are thrown away.
+  bool receiving_;
+
+  // When a data channel opens a stream, it goes into open_streams_.  When we
+  // want to close it, the stream's ID goes into queued_reset_streams_.  When
+  // we actually transmit a RE-CONFIG chunk with that stream ID, the ID goes
+  // into sent_reset_streams_.  When we get a response RE-CONFIG chunk back
+  // acknowledging the reset, we remove the stream ID from
+  // sent_reset_streams_.  We use sent_reset_streams_ to differentiate
+  // between acknowledgment RE-CONFIG and peer-initiated RE-CONFIGs.
+  StreamSet open_streams_;
+  StreamSet queued_reset_streams_;
+  StreamSet sent_reset_streams_;
+
+  // A static human-readable name for debugging messages.
+  const char* debug_name_;
+};
+
+}  // namespace cricket
+
+#endif  // WEBRTC_MEDIA_SCTP_SCTPDATAENGINE_H_