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      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 
     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 
     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.
     67 class 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 
     86 class 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   virtual void OnRtcpReceived(talk_base::Buffer* packet) {}
    120   virtual void OnReadyToSend(bool ready) {}
    121   virtual bool SendData(
    122     const SendDataParams& params,
    123     const talk_base::Buffer& payload,
    124     SendDataResult* result);
    125 
    126  private:
    127   void Construct(talk_base::Timing* timing);
    128 
    129   bool sending_;
    130   bool receiving_;
    131   talk_base::Timing* timing_;
    132   std::vector<DataCodec> send_codecs_;
    133   std::vector<DataCodec> recv_codecs_;
    134   std::vector<StreamParams> send_streams_;
    135   std::vector<StreamParams> recv_streams_;
    136   std::map<uint32, RtpClock*> rtp_clock_by_send_ssrc_;
    137   talk_base::scoped_ptr<talk_base::RateLimiter> send_limiter_;
    138 };
    139 
    140 }  // namespace cricket
    141 
    142 #endif  // TALK_MEDIA_BASE_RTPDATAENGINE_H_
    143