1 /* 2 * Copyright (c) 2015 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_NACK_H_ 12 #define WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_NACK_H_ 13 14 #include <vector> 15 16 #include "webrtc/base/basictypes.h" 17 #include "webrtc/modules/rtp_rtcp/source/rtcp_packet/rtpfb.h" 18 #include "webrtc/modules/rtp_rtcp/source/rtcp_utility.h" 19 20 namespace webrtc { 21 namespace rtcp { 22 23 class Nack : public Rtpfb { 24 public: 25 const uint8_t kFeedbackMessageType = 1; 26 Nack() {} 27 28 virtual ~Nack() {} 29 30 // Parse assumes header is already parsed and validated. 31 bool Parse(const RTCPUtility::RtcpCommonHeader& header, 32 const uint8_t* payload); // Size of the payload is in the header. 33 34 void WithList(const uint16_t* nack_list, size_t length); 35 const std::vector<uint16_t>& packet_ids() const { return packet_ids_; } 36 37 protected: 38 bool Create(uint8_t* packet, 39 size_t* index, 40 size_t max_length, 41 RtcpPacket::PacketReadyCallback* callback) const override; 42 43 size_t BlockLength() const override; 44 45 private: 46 const size_t kNackItemLength = 4; 47 struct PackedNack { 48 uint16_t first_pid; 49 uint16_t bitmask; 50 }; 51 52 void Pack(); // Fills packed_ using packed_ids_. (used in WithList). 53 void Unpack(); // Fills packet_ids_ using packed_. (used in Parse). 54 55 std::vector<PackedNack> packed_; 56 std::vector<uint16_t> packet_ids_; 57 58 RTC_DISALLOW_COPY_AND_ASSIGN(Nack); 59 }; 60 61 } // namespace rtcp 62 } // namespace webrtc 63 #endif // WEBRTC_MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_NACK_H_ 64
