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