2022-06-03 13:25:32 +08:00
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#ifndef ZLMEDIAKIT_SRT_PACKET_H
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#define ZLMEDIAKIT_SRT_PACKET_H
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#include <stdint.h>
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#include <vector>
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#include "Network/Buffer.h"
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2022-06-03 21:17:01 +08:00
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#include "Util/logger.h"
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2022-06-03 13:25:32 +08:00
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#include "Common.hpp"
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#include "HSExt.hpp"
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namespace SRT {
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using namespace toolkit;
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/*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+- SRT Header +-+-+-+-+-+-+-+-+-+-+-+-+-+
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|0| Packet Sequence Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|P P|O|K K|R| Message Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Timestamp |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Destination Socket ID |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ Data +
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Figure 3: Data packet structure
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reference https://haivision.github.io/srt-rfc/draft-sharabayko-srt.html#name-packet-structure
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*/
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class DataPacket : public Buffer {
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public:
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using Ptr = std::shared_ptr<DataPacket>;
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DataPacket() = default;
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~DataPacket() = default;
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static const size_t HEADER_SIZE = 16;
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static bool isDataPacket(uint8_t *buf, size_t len);
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static uint32_t getSocketID(uint8_t *buf, size_t len);
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bool loadFromData(uint8_t *buf, size_t len);
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bool storeToData(uint8_t *buf, size_t len);
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2022-06-03 22:47:52 +08:00
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bool storeToHeader();
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2022-06-03 13:25:32 +08:00
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///////Buffer override///////
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char *data() const override;
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size_t size() const override;
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char *payloadData();
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size_t payloadSize();
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uint8_t f;
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uint32_t packet_seq_number;
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uint8_t PP;
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uint8_t O;
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uint8_t KK;
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uint8_t R;
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uint32_t msg_number;
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uint32_t timestamp;
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uint32_t dst_socket_id;
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2022-06-04 20:51:49 +08:00
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TimePoint get_ts; // recv or send time
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2022-06-03 13:25:32 +08:00
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private:
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BufferRaw::Ptr _data;
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};
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/*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+- SRT Header +-+-+-+-+-+-+-+-+-+-+-+-+-+
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|1| Control Type | Subtype |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type-specific Information |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Timestamp |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Destination Socket ID |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- CIF -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ Control Information Field +
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Figure 4: Control packet structure
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reference https://haivision.github.io/srt-rfc/draft-sharabayko-srt.html#name-control-packets
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*/
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class ControlPacket : public Buffer {
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public:
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using Ptr = std::shared_ptr<ControlPacket>;
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static const size_t HEADER_SIZE = 16;
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static bool isControlPacket(uint8_t *buf, size_t len);
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static uint16_t getControlType(uint8_t *buf, size_t len);
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static uint32_t getSocketID(uint8_t *buf, size_t len);
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ControlPacket() = default;
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virtual ~ControlPacket() = default;
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virtual bool loadFromData(uint8_t *buf, size_t len) = 0;
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virtual bool storeToData() = 0;
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bool loadHeader();
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bool storeToHeader();
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///////Buffer override///////
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char *data() const override;
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size_t size() const override;
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enum {
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HANDSHAKE = 0x0000,
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KEEPALIVE = 0x0001,
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ACK = 0x0002,
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NAK = 0x0003,
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CONGESTIONWARNING = 0x0004,
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SHUTDOWN = 0x0005,
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ACKACK = 0x0006,
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DROPREQ = 0x0007,
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PEERERROR = 0x0008,
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USERDEFINEDTYPE = 0x7FFF
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};
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uint32_t sub_type : 16;
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uint32_t control_type : 15;
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uint32_t f : 1;
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uint8_t type_specific_info[4];
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uint32_t timestamp;
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uint32_t dst_socket_id;
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protected:
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BufferRaw::Ptr _data;
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};
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/**
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Version |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Encryption Field | Extension Field |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Initial Packet Sequence Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Maximum Transmission Unit Size |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Maximum Flow Window Size |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Handshake Type |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| SRT Socket ID |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| SYN Cookie |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ +
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+ Peer IP Address +
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+ +
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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| Extension Type | Extension Length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+ Extension Contents +
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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Figure 5: Handshake packet structure
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https://haivision.github.io/srt-rfc/draft-sharabayko-srt.html#name-handshake
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*/
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class HandshakePacket : public ControlPacket {
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public:
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using Ptr = std::shared_ptr<HandshakePacket>;
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enum { NO_ENCRYPTION = 0, AES_128 = 1, AES_196 = 2, AES_256 = 3 };
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static const size_t HS_CONTENT_MIN_SIZE = 48;
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enum {
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HS_TYPE_DONE = 0xFFFFFFFD,
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HS_TYPE_AGREEMENT = 0xFFFFFFFE,
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HS_TYPE_CONCLUSION = 0xFFFFFFFF,
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HS_TYPE_WAVEHAND = 0x00000000,
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HS_TYPE_INDUCTION = 0x00000001
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};
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enum { HS_EXT_FILED_HSREQ = 0x00000001, HS_EXT_FILED_KMREQ = 0x00000002, HS_EXT_FILED_CONFIG = 0x00000004 };
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HandshakePacket() = default;
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~HandshakePacket() = default;
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static bool isHandshakePacket(uint8_t *buf, size_t len);
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static uint32_t getHandshakeType(uint8_t *buf, size_t len);
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static uint32_t getSynCookie(uint8_t *buf, size_t len);
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static uint32_t generateSynCookie(struct sockaddr_storage* addr,TimePoint ts,uint32_t current_cookie = 0, int correction = 0);
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void assignPeerIP(struct sockaddr_storage* addr);
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///////ControlPacket override///////
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bool loadFromData(uint8_t *buf, size_t len) override;
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bool storeToData() override;
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uint32_t version;
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uint16_t encryption_field;
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uint16_t extension_field;
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uint32_t initial_packet_sequence_number;
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uint32_t mtu;
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uint32_t max_flow_window_size;
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uint32_t handshake_type;
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uint32_t srt_socket_id;
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uint32_t syn_cookie;
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uint8_t peer_ip_addr[16];
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std::vector<HSExt::Ptr> ext_list;
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private:
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bool loadExtMessage(uint8_t *buf,size_t len);
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bool storeExtMessage();
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size_t getExtSize();
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};
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/*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+- SRT Header +-+-+-+-+-+-+-+-+-+-+-+-+-+
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|1| Control Type | Reserved |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type-specific Information |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Timestamp |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Destination Socket ID |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Figure 12: Keep-Alive control packet
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https://haivision.github.io/srt-rfc/draft-sharabayko-srt.html#name-keep-alive
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*/
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class KeepLivePacket : public ControlPacket
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{
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public:
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using Ptr = std::shared_ptr<KeepLivePacket>;
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KeepLivePacket() = default;
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~KeepLivePacket() = default;
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///////ControlPacket override///////
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bool loadFromData(uint8_t *buf, size_t len) override;
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bool storeToData() override;
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};
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/*
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An SRT NAK packet is formatted as follows:
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+- SRT Header +-+-+-+-+-+-+-+-+-+-+-+-+-+
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|1| Control Type | Reserved |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type-specific Information |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Timestamp |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Destination Socket ID |
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+-+-+-+-+-+-+-+-+-+-+-+- CIF (Loss List) -+-+-+-+-+-+-+-+-+-+-+-+
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|0| Lost packet sequence number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|1| Range of lost packets from sequence number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|0| Up to sequence number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|0| Lost packet sequence number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Figure 14: NAK control packet
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https://haivision.github.io/srt-rfc/draft-sharabayko-srt.html#name-nak-control-packet
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*/
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class NAKPacket : public ControlPacket
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{
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public:
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using Ptr = std::shared_ptr<NAKPacket>;
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using LostPair = std::pair<uint32_t,uint32_t>;
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NAKPacket() = default;
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~NAKPacket() = default;
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std::string dump();
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///////ControlPacket override///////
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bool loadFromData(uint8_t *buf, size_t len) override;
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bool storeToData() override;
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std::list<LostPair> lost_list;
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private:
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size_t getCIFSize();
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};
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/*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+- SRT Header +-+-+-+-+-+-+-+-+-+-+-+-+-+
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|1| Control Type = 7 | Reserved = 0 |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Message Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Timestamp |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Destination Socket ID |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| First Packet Sequence Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Last Packet Sequence Number |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Figure 18: Drop Request control packet
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https://haivision.github.io/srt-rfc/draft-sharabayko-srt.html#name-message-drop-request
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*/
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class MsgDropReqPacket : public ControlPacket
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{
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public:
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using Ptr = std::shared_ptr<MsgDropReqPacket>;
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MsgDropReqPacket() = default;
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~MsgDropReqPacket() = default;
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///////ControlPacket override///////
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bool loadFromData(uint8_t *buf, size_t len) override;
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bool storeToData() override;
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uint32_t first_pkt_seq_num;
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uint32_t last_pkt_seq_num;
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};
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2022-06-04 10:11:28 +08:00
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/*
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0 1 2 3
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
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+-+-+-+-+-+-+-+-+-+-+-+-+- SRT Header +-+-+-+-+-+-+-+-+-+-+-+-+-+
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|1| Control Type | Reserved |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type-specific Information |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Timestamp |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Destination Socket ID |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Figure 16: Shutdown control packet
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https://haivision.github.io/srt-rfc/draft-sharabayko-srt.html#name-shutdown
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*/
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2022-06-03 21:17:01 +08:00
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class ShutDownPacket : public ControlPacket
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{
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public:
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using Ptr = std::shared_ptr<ShutDownPacket>;
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ShutDownPacket() = default;
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~ShutDownPacket() = default;
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///////ControlPacket override///////
|
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bool loadFromData(uint8_t *buf, size_t len) override {
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if (len < HEADER_SIZE) {
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|
WarnL << "data size" << len << " less " << HEADER_SIZE;
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return false;
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}
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_data = BufferRaw::create();
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|
_data->assign((char *)buf, len);
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return loadHeader();
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};
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bool storeToData() override {
|
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|
control_type = ControlPacket::SHUTDOWN;
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|
sub_type = 0;
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|
_data = BufferRaw::create();
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|
|
_data->setCapacity(HEADER_SIZE);
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|
_data->setSize(HEADER_SIZE);
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|
|
return storeToHeader();
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|
};
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|
};
|
2022-06-03 13:25:32 +08:00
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} // namespace SRT
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#endif //ZLMEDIAKIT_SRT_PACKET_H
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