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 39 namespace cricket { 40 41 struct DataCodec; 42 43 class RtpDataEngine : public DataEngineInterface { 44 public: 45 RtpDataEngine(); 46 47 virtual DataMediaChannel* CreateChannel(DataChannelType data_channel_type); 48 data_codecs()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. SetTiming(rtc::Timing * timing)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. 67 class RtpClock { 68 public: RtpClock(int clockrate,uint16_t first_seq_num,uint32_t timestamp_offset)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 85 class 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 set_timing(rtc::Timing * timing)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); SetSend(bool send)104 virtual bool SetSend(bool send) { 105 sending_ = send; 106 return true; 107 } SetReceive(bool receive)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); OnRtcpReceived(rtc::Buffer * packet,const rtc::PacketTime & packet_time)114 virtual void OnRtcpReceived(rtc::Buffer* packet, 115 const rtc::PacketTime& packet_time) {} OnReadyToSend(bool ready)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