nack.h (1775B)
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 <cstddef> 15 #include <cstdint> 16 #include <vector> 17 18 #include "modules/rtp_rtcp/source/rtcp_packet/rtpfb.h" 19 20 namespace webrtc { 21 namespace rtcp { 22 class CommonHeader; 23 24 class Nack : public Rtpfb { 25 public: 26 static constexpr uint8_t kFeedbackMessageType = 1; 27 Nack(); 28 Nack(const Nack&); 29 ~Nack() override; 30 31 // Parse assumes header is already parsed and validated. 32 bool Parse(const CommonHeader& packet); 33 34 void SetPacketIds(const uint16_t* nack_list, size_t length); 35 void SetPacketIds(std::vector<uint16_t> nack_list); 36 const std::vector<uint16_t>& packet_ids() const { return packet_ids_; } 37 38 size_t BlockLength() const override; 39 40 bool Create(uint8_t* packet, 41 size_t* index, 42 size_t max_length, 43 PacketReadyCallback callback) const override; 44 45 private: 46 static constexpr 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 SetPacketIds). 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 59 } // namespace rtcp 60 } // namespace webrtc 61 #endif // MODULES_RTP_RTCP_SOURCE_RTCP_PACKET_NACK_H_