Line data    Source code

       1             : /*
       2             :  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
       3             :  *
       4             :  *  Use of this source code is governed by a BSD-style license
       5             :  *  that can be found in the LICENSE file in the root of the source
       6             :  *  tree. An additional intellectual property rights grant can be found
       7             :  *  in the file PATENTS.  All contributing project authors may
       8             :  *  be found in the AUTHORS file in the root of the source tree.
       9             :  */
      10             : 
      11             : #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_FIR_H_
      12             : #define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_FIR_H_
      13             : 
      14             : #include <vector>
      15             : 
      16             : #include "webrtc/base/basictypes.h"
      17             : #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h"
      18             : 
      19             : namespace webrtc {
      20             : namespace rtcp {
      21             : class CommonHeader;
      22             : // Full intra request (FIR) (RFC 5104).
      23             : class Fir : public Psfb {
      24             :  public:
      25             :   static constexpr uint8_t kFeedbackMessageType = 4;
      26             :   struct Request {
      27           0 :     Request() : ssrc(0), seq_nr(0) {}
      28           0 :     Request(uint32_t ssrc, uint8_t seq_nr) : ssrc(ssrc), seq_nr(seq_nr) {}
      29             :     uint32_t ssrc;
      30             :     uint8_t seq_nr;
      31             :   };
      32             : 
      33           0 :   Fir() {}
      34           0 :   ~Fir() override {}
      35             : 
      36             :   // Parse assumes header is already parsed and validated.
      37             :   bool Parse(const CommonHeader& packet);
      38             : 
      39           0 :   void AddRequestTo(uint32_t ssrc, uint8_t seq_num) {
      40           0 :     items_.emplace_back(ssrc, seq_num);
      41           0 :   }
      42           0 :   const std::vector<Request>& requests() const { return items_; }
      43             : 
      44             :  protected:
      45             :   bool Create(uint8_t* packet,
      46             :               size_t* index,
      47             :               size_t max_length,
      48             :               RtcpPacket::PacketReadyCallback* callback) const override;
      49             : 
      50             :  private:
      51             :   static constexpr size_t kFciLength = 8;
      52           0 :   size_t BlockLength() const override {
      53           0 :     return kHeaderLength + kCommonFeedbackLength + kFciLength * items_.size();
      54             :   }
      55             :   // SSRC of media source is not used in FIR packet. Shadow base functions.
      56             :   void SetMediaSsrc(uint32_t ssrc);
      57             :   uint32_t media_ssrc() const;
      58             : 
      59             :   std::vector<Request> items_;
      60             : };
      61             : }  // namespace rtcp
      62             : }  // namespace webrtc
      63             : #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_FIR_H_