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/media/base/constants.h"
35#include "talk/media/base/mediachannel.h"
36#include "talk/media/base/mediaengine.h"
37#include "webrtc/base/timing.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(rtc::Timing* timing) {
55    timing_.reset(timing);
56  }
57
58 private:
59  std::vector<DataCodec> data_codecs_;
60  rtc::scoped_ptr<rtc::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_t first_seq_num, uint32_t timestamp_offset)
70      : clockrate_(clockrate),
71        last_seq_num_(first_seq_num),
72        timestamp_offset_(timestamp_offset) {}
73
74  // Given the current time (in number of seconds which must be
75  // monotonically increasing), Return the next sequence number and
76  // timestamp.
77  void Tick(double now, int* seq_num, uint32_t* timestamp);
78
79 private:
80  int clockrate_;
81  uint16_t last_seq_num_;
82  uint32_t timestamp_offset_;
83};
84
85class RtpDataMediaChannel : public DataMediaChannel {
86 public:
87  // Timing* Used for the RtpClock
88  explicit RtpDataMediaChannel(rtc::Timing* timing);
89  // Sets Timing == NULL, so you'll need to call set_timer() before
90  // using it.  This is needed by FakeMediaEngine.
91  RtpDataMediaChannel();
92  virtual ~RtpDataMediaChannel();
93
94  void set_timing(rtc::Timing* timing) {
95    timing_ = timing;
96  }
97
98  virtual bool SetSendParameters(const DataSendParameters& params);
99  virtual bool SetRecvParameters(const DataRecvParameters& params);
100  virtual bool AddSendStream(const StreamParams& sp);
101  virtual bool RemoveSendStream(uint32_t ssrc);
102  virtual bool AddRecvStream(const StreamParams& sp);
103  virtual bool RemoveRecvStream(uint32_t ssrc);
104  virtual bool SetSend(bool send) {
105    sending_ = send;
106    return true;
107  }
108  virtual bool SetReceive(bool receive) {
109    receiving_ = receive;
110    return true;
111  }
112  virtual void OnPacketReceived(rtc::Buffer* packet,
113                                const rtc::PacketTime& packet_time);
114  virtual void OnRtcpReceived(rtc::Buffer* packet,
115                              const rtc::PacketTime& packet_time) {}
116  virtual void OnReadyToSend(bool ready) {}
117  virtual bool SendData(
118    const SendDataParams& params,
119    const rtc::Buffer& payload,
120    SendDataResult* result);
121
122 private:
123  void Construct(rtc::Timing* timing);
124  bool SetMaxSendBandwidth(int bps);
125  bool SetSendCodecs(const std::vector<DataCodec>& codecs);
126  bool SetRecvCodecs(const std::vector<DataCodec>& codecs);
127
128  bool sending_;
129  bool receiving_;
130  rtc::Timing* timing_;
131  std::vector<DataCodec> send_codecs_;
132  std::vector<DataCodec> recv_codecs_;
133  std::vector<StreamParams> send_streams_;
134  std::vector<StreamParams> recv_streams_;
135  std::map<uint32_t, RtpClock*> rtp_clock_by_send_ssrc_;
136  rtc::scoped_ptr<rtc::RateLimiter> send_limiter_;
137};
138
139}  // namespace cricket
140
141#endif  // TALK_MEDIA_BASE_RTPDATAENGINE_H_
142