1/*
2 * libjingle
3 * Copyright 2012 Google Inc.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 *
8 *  1. Redistributions of source code must retain the above copyright notice,
9 *     this list of conditions and the following disclaimer.
10 *  2. Redistributions in binary form must reproduce the above copyright notice,
11 *     this list of conditions and the following disclaimer in the documentation
12 *     and/or other materials provided with the distribution.
13 *  3. The name of the author may not be used to endorse or promote products
14 *     derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef TALK_MEDIA_BASE_RTPDATAENGINE_H_
29#define TALK_MEDIA_BASE_RTPDATAENGINE_H_
30
31#include <string>
32#include <vector>
33
34#include "talk/base/timing.h"
35#include "talk/media/base/constants.h"
36#include "talk/media/base/mediachannel.h"
37#include "talk/media/base/mediaengine.h"
38
39namespace cricket {
40
41struct DataCodec;
42
43class RtpDataEngine : public DataEngineInterface {
44 public:
45  RtpDataEngine();
46
47  virtual DataMediaChannel* CreateChannel(DataChannelType data_channel_type);
48
49  virtual const std::vector<DataCodec>& data_codecs() {
50    return data_codecs_;
51  }
52
53  // Mostly for testing with a fake clock.  Ownership is passed in.
54  void SetTiming(talk_base::Timing* timing) {
55    timing_.reset(timing);
56  }
57
58 private:
59  std::vector<DataCodec> data_codecs_;
60  talk_base::scoped_ptr<talk_base::Timing> timing_;
61};
62
63// Keep track of sequence number and timestamp of an RTP stream.  The
64// sequence number starts with a "random" value and increments.  The
65// timestamp starts with a "random" value and increases monotonically
66// according to the clockrate.
67class RtpClock {
68 public:
69  RtpClock(int clockrate, uint16 first_seq_num, uint32 timestamp_offset)
70      : clockrate_(clockrate),
71        last_seq_num_(first_seq_num),
72        timestamp_offset_(timestamp_offset) {
73  }
74
75  // Given the current time (in number of seconds which must be
76  // monotonically increasing), Return the next sequence number and
77  // timestamp.
78  void Tick(double now, int* seq_num, uint32* timestamp);
79
80 private:
81  int clockrate_;
82  uint16 last_seq_num_;
83  uint32 timestamp_offset_;
84};
85
86class RtpDataMediaChannel : public DataMediaChannel {
87 public:
88  // Timing* Used for the RtpClock
89  explicit RtpDataMediaChannel(talk_base::Timing* timing);
90  // Sets Timing == NULL, so you'll need to call set_timer() before
91  // using it.  This is needed by FakeMediaEngine.
92  RtpDataMediaChannel();
93  virtual ~RtpDataMediaChannel();
94
95  void set_timing(talk_base::Timing* timing) {
96    timing_ = timing;
97  }
98
99  virtual bool SetSendBandwidth(bool autobw, int bps);
100  virtual bool SetRecvRtpHeaderExtensions(
101      const std::vector<RtpHeaderExtension>& extensions) { return true; }
102  virtual bool SetSendRtpHeaderExtensions(
103      const std::vector<RtpHeaderExtension>& extensions) { return true; }
104  virtual bool SetSendCodecs(const std::vector<DataCodec>& codecs);
105  virtual bool SetRecvCodecs(const std::vector<DataCodec>& codecs);
106  virtual bool AddSendStream(const StreamParams& sp);
107  virtual bool RemoveSendStream(uint32 ssrc);
108  virtual bool AddRecvStream(const StreamParams& sp);
109  virtual bool RemoveRecvStream(uint32 ssrc);
110  virtual bool SetSend(bool send) {
111    sending_ = send;
112    return true;
113  }
114  virtual bool SetReceive(bool receive) {
115    receiving_ = receive;
116    return true;
117  }
118  virtual void OnPacketReceived(talk_base::Buffer* packet,
119                                const talk_base::PacketTime& packet_time);
120  virtual void OnRtcpReceived(talk_base::Buffer* packet,
121                              const talk_base::PacketTime& packet_time) {}
122  virtual void OnReadyToSend(bool ready) {}
123  virtual bool SendData(
124    const SendDataParams& params,
125    const talk_base::Buffer& payload,
126    SendDataResult* result);
127
128 private:
129  void Construct(talk_base::Timing* timing);
130
131  bool sending_;
132  bool receiving_;
133  talk_base::Timing* timing_;
134  std::vector<DataCodec> send_codecs_;
135  std::vector<DataCodec> recv_codecs_;
136  std::vector<StreamParams> send_streams_;
137  std::vector<StreamParams> recv_streams_;
138  std::map<uint32, RtpClock*> rtp_clock_by_send_ssrc_;
139  talk_base::scoped_ptr<talk_base::RateLimiter> send_limiter_;
140};
141
142}  // namespace cricket
143
144#endif  // TALK_MEDIA_BASE_RTPDATAENGINE_H_
145