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