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_REMB_H_
      12             : #define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_REMB_H_
      13             : 
      14             : #include <vector>
      15             : 
      16             : #include "webrtc/base/basictypes.h"
      17             : #include "webrtc/base/constructormagic.h"
      18             : #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/psfb.h"
      19             : 
      20             : namespace webrtc {
      21             : namespace rtcp {
      22             : class CommonHeader;
      23             : 
      24             : // Receiver Estimated Max Bitrate (REMB) (draft-alvestrand-rmcat-remb).
      25             : class Remb : public Psfb {
      26             :  public:
      27             :   static constexpr uint8_t kFeedbackMessageType = 15;
      28             :   static constexpr size_t kMaxNumberOfSsrcs = 0xff;
      29             : 
      30           0 :   Remb() : bitrate_bps_(0) {}
      31           0 :   ~Remb() override {}
      32             : 
      33             :   // Parse assumes header is already parsed and validated.
      34             :   bool Parse(const CommonHeader& packet);
      35             : 
      36             :   bool SetSsrcs(std::vector<uint32_t> ssrcs);
      37           0 :   void SetBitrateBps(uint64_t bitrate_bps) { bitrate_bps_ = bitrate_bps; }
      38             : 
      39           0 :   uint64_t bitrate_bps() const { return bitrate_bps_; }
      40             :   const std::vector<uint32_t>& ssrcs() const { return ssrcs_; }
      41             : 
      42             :  protected:
      43             :   bool Create(uint8_t* packet,
      44             :               size_t* index,
      45             :               size_t max_length,
      46             :               RtcpPacket::PacketReadyCallback* callback) const override;
      47             : 
      48           0 :   size_t BlockLength() const override {
      49           0 :     return kHeaderLength + kCommonFeedbackLength + (2 + ssrcs_.size()) * 4;
      50             :   }
      51             : 
      52             :  private:
      53             :   static constexpr uint32_t kUniqueIdentifier = 0x52454D42;  // 'R' 'E' 'M' 'B'.
      54             : 
      55             :   // Media ssrc is unused, shadow base class setter and getter.
      56             :   void SetMediaSsrc(uint32_t);
      57             :   uint32_t media_ssrc() const;
      58             : 
      59             :   uint64_t bitrate_bps_;
      60             :   std::vector<uint32_t> ssrcs_;
      61             : 
      62             :   RTC_DISALLOW_COPY_AND_ASSIGN(Remb);
      63             : };
      64             : }  // namespace rtcp
      65             : }  // namespace webrtc
      66             : #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_REMB_H_