text: /**
   * The MIT License (MIT)
   *
   * Copyright (c) 2013-2020 John
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of
   * this software and associated documentation files (the "Software"), to deal in
   * the Software without restriction, including without limitation the rights to
   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
   * the Software, and to permit persons to whom the Software is furnished to do so,
   * subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
   * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
   * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
   * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   */
  
  #ifndef SRS_APP_RTC_HPP
  #define SRS_APP_RTC_HPP
  
  #include <srs_core.hpp>
  
  #include <string>
  #include <vector>
  #include <map>
  
  class SrsFormat;
  class SrsSample;
  class SrsSharedPtrMessage;
  class SrsRtpSharedPacket;
  class SrsRequest;
  class SrsOriginHub;
  class SrsAudioRecode;
  class SrsBuffer;
  
  // The RTP packet max size, should never exceed this size.
  const int kRtpPacketSize        = 1500;
  
  // Payload type will rewrite in srs_app_rtc_conn.cpp when send to client.
  const uint8_t kOpusPayloadType  = 111;
  const uint8_t kH264PayloadType  = 102;
  
  const int kChannel              = 2;
  const int kSamplerate           = 48000;
  
  // SSRC will rewrite in srs_app_rtc_conn.cpp when send to client.
  const uint32_t kAudioSSRC       = 1;
  const uint32_t kVideoSSRC       = 2;
  
  // TODO: Define interface class like ISrsRtpMuxer
  class SrsRtpH264Muxer
  {
  public:
      bool discard_bframe;
  public:
      SrsRtpH264Muxer();
      virtual ~SrsRtpH264Muxer();
  public:
      srs_error_t filter(SrsSharedPtrMessage* shared_video, SrsFormat* format);
  };
  
  // TODO: FIXME: It's not a muxer, but a transcoder.
  class SrsRtpOpusMuxer
  {
  private:
      SrsAudioRecode* codec;
  public:
      SrsRtpOpusMuxer();
      virtual ~SrsRtpOpusMuxer();
      virtual srs_error_t initialize();
  public:
      srs_error_t transcode(SrsSharedPtrMessage* shared_audio, char* adts_audio, int nn_adts_audio);
  };
  
  class SrsRtc
  {
  private:
      SrsRequest* req;
      bool enabled;
      bool disposable;
      bool discard_aac;
      srs_utime_t last_update_time;
      SrsRtpH264Muxer* rtp_h264_muxer;
      SrsRtpOpusMuxer* rtp_opus_muxer;
      SrsOriginHub* hub;
  public:
      SrsRtc();
      virtual ~SrsRtc();
  public:
      virtual void dispose();
      virtual srs_error_t cycle();
  public:
      virtual srs_error_t initialize(SrsOriginHub* h, SrsRequest* r);
      virtual srs_error_t on_publish();
      virtual void on_unpublish();
      virtual srs_error_t on_audio(SrsSharedPtrMessage* shared_audio, SrsFormat* format);
      virtual srs_error_t on_video(SrsSharedPtrMessage* shared_video, SrsFormat* format);
  };
  
  #endif
  