text: /*
   *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
   *
   *  Use of this source code is governed by a BSD-style license
   *  that can be found in the LICENSE file in the root of the source
   *  tree. An additional intellectual property rights grant can be found
   *  in the file PATENTS.  All contributing project authors may
   *  be found in the AUTHORS file in the root of the source tree.
   */
  
  #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_REMB_H_
  #define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_REMB_H_
  
  #include <vector>
  
  #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h"
  #include "webrtc/rtc_base/basictypes.h"
  
  namespace webrtc {
  namespace rtcp {
  class CommonHeader;
  
  // Receiver Estimated Max Bitrate (REMB) (draft-alvestrand-rmcat-remb).
  class Remb : public Psfb {
   public:
    static constexpr uint8_t kFeedbackMessageType = 15;
    static constexpr size_t kMaxNumberOfSsrcs = 0xff;
  
    Remb();
    ~Remb() override;
  
    // Parse assumes header is already parsed and validated.
    bool Parse(const CommonHeader& packet);
  
    bool SetSsrcs(std::vector<uint32_t> ssrcs);
    void SetBitrateBps(uint64_t bitrate_bps) { bitrate_bps_ = bitrate_bps; }
  
    uint64_t bitrate_bps() const { return bitrate_bps_; }
    const std::vector<uint32_t>& ssrcs() const { return ssrcs_; }
  
    size_t BlockLength() const override;
  
    bool Create(uint8_t* packet,
                size_t* index,
                size_t max_length,
                RtcpPacket::PacketReadyCallback* callback) const override;
  
   private:
    static constexpr uint32_t kUniqueIdentifier = 0x52454D42;  // 'R' 'E' 'M' 'B'.
  
    // Media ssrc is unused, shadow base class setter and getter.
    void SetMediaSsrc(uint32_t);
    uint32_t media_ssrc() const;
  
    uint64_t bitrate_bps_;
    std::vector<uint32_t> ssrcs_;
  };
  }  // namespace rtcp
  }  // namespace webrtc
  #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_REMB_H_
  