mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-24 19:50:38 +08:00
672 lines
21 KiB
C++
672 lines
21 KiB
C++
/*
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* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
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*
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* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
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*
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* Use of this source code is governed by MIT license that can be found in the
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* LICENSE file in the root of the source tree. All contributing project authors
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* may be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef ZLMEDIAKIT_RTCP_H
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#define ZLMEDIAKIT_RTCP_H
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#include <stdint.h>
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#include <vector>
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#include "Util/util.h"
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#include "Network/Buffer.h"
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#include "Common/macros.h"
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using namespace std;
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using namespace toolkit;
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namespace mediakit {
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#if defined(_WIN32)
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#pragma pack(push, 1)
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#endif // defined(_WIN32)
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//http://www.networksorcery.com/enp/protocol/rtcp.htm
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#define RTCP_PT_MAP(XX) \
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XX(RTCP_FIR, 192) \
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XX(RTCP_NACK, 193) \
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XX(RTCP_SMPTETC, 194) \
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XX(RTCP_IJ, 195) \
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XX(RTCP_SR, 200) \
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XX(RTCP_RR, 201) \
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XX(RTCP_SDES, 202) \
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XX(RTCP_BYE, 203) \
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XX(RTCP_APP, 204) \
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XX(RTCP_RTPFB, 205) \
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XX(RTCP_PSFB, 206) \
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XX(RTCP_XR, 207) \
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XX(RTCP_AVB, 208) \
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XX(RTCP_RSI, 209) \
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XX(RTCP_TOKEN, 210)
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//https://tools.ietf.org/html/rfc3550#section-6.5
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#define SDES_TYPE_MAP(XX) \
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XX(RTCP_SDES_END, 0) \
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XX(RTCP_SDES_CNAME, 1) \
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XX(RTCP_SDES_NAME, 2) \
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XX(RTCP_SDES_EMAIL, 3) \
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XX(RTCP_SDES_PHONE, 4) \
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XX(RTCP_SDES_LOC, 5) \
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XX(RTCP_SDES_TOOL, 6) \
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XX(RTCP_SDES_NOTE, 7) \
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XX(RTCP_SDES_PRIVATE, 8)
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//https://datatracker.ietf.org/doc/rfc4585/?include_text=1
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//6.3. Payload-Specific Feedback Messages
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//
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// Payload-Specific FB messages are identified by the value PT=PSFB as
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// RTCP message type.
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//
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// Three payload-specific FB messages are defined so far plus an
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// application layer FB message. They are identified by means of the
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// FMT parameter as follows:
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//
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// 0: unassigned
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// 1: Picture Loss Indication (PLI)
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// 2: Slice Loss Indication (SLI)
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// 3: Reference Picture Selection Indication (RPSI)
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// 4: FIR https://tools.ietf.org/html/rfc5104#section-4.3.1.1
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// 5: TSTR https://tools.ietf.org/html/rfc5104#section-4.3.2.1
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// 6: TSTN https://tools.ietf.org/html/rfc5104#section-4.3.2.1
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// 7: VBCM https://tools.ietf.org/html/rfc5104#section-4.3.4.1
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// 8-14: unassigned
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// 15: REMB / Application layer FB (AFB) message, https://tools.ietf.org/html/draft-alvestrand-rmcat-remb-03
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// 16-30: unassigned
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// 31: reserved for future expansion of the sequence number space
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#define PSFB_TYPE_MAP(XX) \
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XX(RTCP_PSFB_PLI, 1) \
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XX(RTCP_PSFB_SLI, 2) \
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XX(RTCP_PSFB_RPSI, 3) \
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XX(RTCP_PSFB_FIR, 4) \
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XX(RTCP_PSFB_TSTR, 5)\
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XX(RTCP_PSFB_TSTN, 6)\
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XX(RTCP_PSFB_VBCM, 7) \
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XX(RTCP_PSFB_REMB, 15)
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//https://tools.ietf.org/html/rfc4585#section-6.2
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//6.2. Transport Layer Feedback Messages
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//
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// Transport layer FB messages are identified by the value RTPFB as RTCP
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// message type.
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//
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// A single general purpose transport layer FB message is defined in
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// this document: Generic NACK. It is identified by means of the FMT
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// parameter as follows:
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//
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// 0: unassigned
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// 1: Generic NACK
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// 2: reserved https://tools.ietf.org/html/rfc5104#section-4.2
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// 3: TMMBR https://tools.ietf.org/html/rfc5104#section-4.2.1.1
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// 4: TMMBN https://tools.ietf.org/html/rfc5104#section-4.2.2.1
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// 5-14: unassigned
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// 15 transport-cc https://tools.ietf.org/html/draft-holmer-rmcat-transport-wide-cc-extensions-01
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// 16-30: unassigned
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// 31: reserved for future expansion of the identifier number space
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#define RTPFB_TYPE_MAP(XX) \
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XX(RTCP_RTPFB_NACK, 1) \
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XX(RTCP_RTPFB_TMMBR, 3) \
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XX(RTCP_RTPFB_TMMBN, 4) \
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XX(RTCP_RTPFB_TWCC, 15)
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//rtcp类型枚举
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enum class RtcpType : uint8_t {
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#define XX(key, value) key = value,
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RTCP_PT_MAP(XX)
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#undef XX
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};
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//sdes类型枚举
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enum class SdesType : uint8_t {
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#define XX(key, value) key = value,
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SDES_TYPE_MAP(XX)
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#undef XX
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};
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//psfb类型枚举
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enum class PSFBType : uint8_t {
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#define XX(key, value) key = value,
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PSFB_TYPE_MAP(XX)
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#undef XX
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};
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//rtpfb类型枚举
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enum class RTPFBType : uint8_t {
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#define XX(key, value) key = value,
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RTPFB_TYPE_MAP(XX)
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#undef XX
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};
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/**
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* RtcpType转描述字符串
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*/
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const char *rtcpTypeToStr(RtcpType type);
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/**
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* SdesType枚举转描述字符串
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*/
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const char *sdesTypeToStr(SdesType type);
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/**
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* psfb枚举转描述字符串
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*/
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const char *psfbTypeToStr(PSFBType type);
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/**
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* rtpfb枚举转描述字符串
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*/
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const char *rtpfbTypeToStr(RTPFBType type);
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class RtcpHeader {
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public:
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#if __BYTE_ORDER == __BIG_ENDIAN
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//版本号，固定为2
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uint32_t version: 2;
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//padding，固定为0
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uint32_t padding: 1;
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//reception report count
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uint32_t report_count: 5;
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#else
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//reception report count
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uint32_t report_count: 5;
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//padding，末尾是否有追加填充
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uint32_t padding: 1;
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//版本号，固定为2
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uint32_t version: 2;
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#endif
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//rtcp类型,RtcpType
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uint32_t pt: 8;
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private:
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//长度
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uint32_t length: 16;
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public:
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/**
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* 解析rtcp并转换网络字节序为主机字节序，返回RtcpHeader派生类列表
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* @param data 数据指针
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* @param size 数据总长度
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* @return rtcp对象列表，无需free
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*/
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static vector<RtcpHeader *> loadFromBytes(char *data, size_t size);
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/**
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* rtcp包转Buffer对象
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* @param rtcp rtcp包对象智能指针
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* @return Buffer对象
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*/
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static Buffer::Ptr toBuffer(std::shared_ptr<RtcpHeader> rtcp);
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/**
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* 打印rtcp相关字段详情(调用派生类的dumpString函数)
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* 内部会判断是什么类型的派生类
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* 使用net2Host转换成主机字节序后才可使用此函数
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*/
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string dumpString() const;
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/**
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* 根据length字段获取rtcp总长度
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*/
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size_t getSize() const;
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/**
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* 后面追加padding数据长度
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*/
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size_t getPaddingSize() const;
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/**
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* 设置rtcp length字段
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* @param size rtcp总长度，单位字节
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*/
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void setSize(size_t size);
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protected:
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/**
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* 打印字段详情
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* 使用net2Host转换成主机字节序后才可使用此函数
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*/
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string dumpHeader() const;
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private:
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/**
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* 调用派生类的net2Host函数
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* @param size rtcp字符长度
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*/
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void net2Host(size_t size);
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} PACKED;
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/////////////////////////////////////////////////////////////////////////////
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//ReportBlock
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class ReportItem {
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public:
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friend class RtcpSR;
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friend class RtcpRR;
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uint32_t ssrc;
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//Fraction lost
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uint32_t fraction: 8;
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//Cumulative number of packets lost
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uint32_t cumulative: 24;
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//Sequence number cycles count
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uint16_t seq_cycles;
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//Highest sequence number received
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uint16_t seq_max;
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//Interarrival jitter
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uint32_t jitter;
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//Last SR timestamp, NTP timestamp,(ntpmsw & 0xFFFF) << 16 | (ntplsw >> 16) & 0xFFFF)
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uint32_t last_sr_stamp;
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//Delay since last SR timestamp,expressed in units of 1/65536 seconds
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uint32_t delay_since_last_sr;
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private:
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/**
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* 打印字段详情
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* 使用net2Host转换成主机字节序后才可使用此函数
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*/
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string dumpString() const;
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/**
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* 网络字节序转换为主机字节序
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*/
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void net2Host();
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}PACKED;
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/*
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* 6.4.1 SR: Sender Report RTCP Packet
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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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header |V=2|P| RC | PT=SR=200 | length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| SSRC of sender |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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sender | NTP timestamp, most significant word |
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info +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| NTP timestamp, least significant word |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| RTP timestamp |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| sender's packet count |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| sender's octet count |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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report | SSRC_1 (SSRC of first source) |
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block +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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1 | fraction lost | cumulative number of packets lost |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| extended highest sequence number received |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| interarrival jitter |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| last SR (LSR) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| delay since last SR (DLSR) |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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report | SSRC_2 (SSRC of second source) |
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block +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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2 : ... :
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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| profile-specific extensions |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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// sender report
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class RtcpSR : public RtcpHeader {
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public:
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friend class RtcpHeader;
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uint32_t ssrc;
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// ntp timestamp MSW(in second)
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uint32_t ntpmsw;
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// ntp timestamp LSW(in picosecond)
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uint32_t ntplsw;
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// rtp timestamp
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uint32_t rtpts;
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// sender packet count
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uint32_t packet_count;
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// sender octet count
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uint32_t octet_count;
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//可能有很多个
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ReportItem items;
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public:
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/**
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* 创建SR包，只赋值了RtcpHeader部分(网络字节序)
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* @param item_count ReportItem对象个数
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* @return SR包
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*/
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static std::shared_ptr<RtcpSR> create(size_t item_count);
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/**
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* 设置ntpmsw与ntplsw字段为网络字节序
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* @param tv 时间
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*/
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void setNtpStamp(struct timeval tv);
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/**
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* 返回ntp时间的字符串
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* 使用net2Host转换成主机字节序后才可使用此函数
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*/
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string getNtpStamp() const;
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/**
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* 获取ReportItem对象指针列表
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* 使用net2Host转换成主机字节序后才可使用此函数
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*/
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vector<ReportItem*> getItemList();
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private:
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/**
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* 打印字段详情
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* 使用net2Host转换成主机字节序后才可使用此函数
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*/
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string dumpString() const;
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/**
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* 网络字节序转换为主机字节序
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* @param size 字节长度，防止内存越界
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*/
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void net2Host(size_t size);
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} PACKED;
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/////////////////////////////////////////////////////////////////////////////
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/*
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* 6.4.2 RR: Receiver Report RTCP Packet
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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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header |V=2|P| RC | PT=RR=201 | length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| SSRC of packet sender |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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report | SSRC_1 (SSRC of first source) |
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block +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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1 | fraction lost | cumulative number of packets lost |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| extended highest sequence number received |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| interarrival jitter |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| last SR (LSR) |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| delay since last SR (DLSR) |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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report | SSRC_2 (SSRC of second source) |
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block +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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2 : ... :
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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| profile-specific extensions |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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//Receiver Report
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class RtcpRR : public RtcpHeader {
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public:
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friend class RtcpHeader;
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uint32_t ssrc;
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//可能有很多个
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ReportItem items;
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public:
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/**
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* 创建RR包，只赋值了RtcpHeader部分
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* @param item_count ReportItem对象个数
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* @return RR包
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*/
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static std::shared_ptr<RtcpRR> create(size_t item_count);
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/**
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* 获取ReportItem对象指针列表
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* 使用net2Host转换成主机字节序后才可使用此函数
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*/
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vector<ReportItem*> getItemList();
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private:
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/**
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* 网络字节序转换为主机字节序
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* @param size 字节长度，防止内存越界
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*/
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void net2Host(size_t size);
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/**
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* 打印字段详情
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* 使用net2Host转换成主机字节序后才可使用此函数
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*/
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string dumpString() const;
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} PACKED;
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/////////////////////////////////////////////////////////////////////////////
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/*
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* 6.5 SDES: Source Description RTCP Packet
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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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header |V=2|P| SC | PT=SDES=202 | length |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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chunk | SSRC/CSRC_1 |
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1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| SDES items |
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| ... |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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chunk | SSRC/CSRC_2 |
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2 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| SDES items |
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| ... |
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+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
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*/
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/*
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SDES items 定义
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0 1 2 3
|
||
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
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| SdesType | length | user and domain name ...
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
*/
|
||
|
||
//Source description item
|
||
class SdesItem {
|
||
public:
|
||
friend class RtcpSdes;
|
||
|
||
uint32_t ssrc;
|
||
//SdesType
|
||
uint8_t type;
|
||
//text长度股，可以为0
|
||
uint8_t txt_len;
|
||
//不定长
|
||
char text[1];
|
||
//最后以RTCP_SDES_END结尾
|
||
//只字段为占位字段，不代表真实位置
|
||
uint8_t end;
|
||
|
||
public:
|
||
/**
|
||
* 返回改对象字节长度
|
||
*/
|
||
size_t totalBytes() const;
|
||
|
||
/**
|
||
* 本对象最少长度
|
||
*/
|
||
static size_t minSize();
|
||
|
||
private:
|
||
/**
|
||
* 打印字段详情
|
||
* 使用net2Host转换成主机字节序后才可使用此函数
|
||
*/
|
||
string dumpString() const;
|
||
|
||
/**
|
||
* 网络字节序转换为主机字节序
|
||
*/
|
||
void net2Host();
|
||
} PACKED;
|
||
|
||
//Source description
|
||
class RtcpSdes : public RtcpHeader {
|
||
public:
|
||
friend class RtcpHeader;
|
||
|
||
//可能有很多个
|
||
SdesItem items;
|
||
|
||
public:
|
||
/**
|
||
* 创建SDES包，只赋值了RtcpHeader以及SdesItem对象的length和text部分
|
||
* @param item_text SdesItem列表，只赋值length和text部分
|
||
* @return SDES包
|
||
*/
|
||
static std::shared_ptr<RtcpSdes> create(const std::vector<string> &item_text);
|
||
|
||
/**
|
||
* 获取SdesItem对象指针列表
|
||
* 使用net2Host转换成主机字节序后才可使用此函数
|
||
*/
|
||
vector<SdesItem*> getItemList();
|
||
|
||
private:
|
||
/**
|
||
* 打印字段详情
|
||
* 使用net2Host转换成主机字节序后才可使用此函数
|
||
*/
|
||
string dumpString() const;
|
||
|
||
/**
|
||
* 网络字节序转换为主机字节序
|
||
* @param size 字节长度，防止内存越界
|
||
*/
|
||
void net2Host(size_t size);
|
||
} PACKED;
|
||
|
||
// https://tools.ietf.org/html/rfc4585#section-6.1
|
||
// 6.1. Common Packet Format for Feedback Messages
|
||
//
|
||
// All FB messages MUST use a common packet format that is depicted in
|
||
// Figure 3:
|
||
//
|
||
// 0 1 2 3
|
||
// 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
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// |V=2|P| FMT | PT | length |
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// | SSRC of packet sender |
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// | SSRC of media source |
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// : Feedback Control Information (FCI) :
|
||
// : :
|
||
// rtcpfb和psfb的数据结构一致
|
||
class RtcpFB : public RtcpHeader {
|
||
public:
|
||
friend class RtcpHeader;
|
||
uint32_t ssrc;
|
||
uint32_t ssrc_media;
|
||
|
||
public:
|
||
/**
|
||
* 创建psfb类型的反馈包
|
||
*/
|
||
static std::shared_ptr<RtcpFB> create(PSFBType fmt, const void *fci = nullptr, size_t fci_len = 0);
|
||
|
||
/**
|
||
* 创建rtpfb类型的反馈包
|
||
*/
|
||
static std::shared_ptr<RtcpFB> create(RTPFBType fmt, const void *fci = nullptr, size_t fci_len = 0);
|
||
|
||
private:
|
||
/**
|
||
* 打印字段详情
|
||
* 使用net2Host转换成主机字节序后才可使用此函数
|
||
*/
|
||
string dumpString() const;
|
||
|
||
/**
|
||
* 网络字节序转换为主机字节序
|
||
* @param size 字节长度，防止内存越界
|
||
*/
|
||
void net2Host(size_t size);
|
||
|
||
private:
|
||
static std::shared_ptr<RtcpFB> create_l(RtcpType type, int fmt, const void *fci, size_t fci_len);
|
||
} PACKED;
|
||
|
||
//BYE
|
||
/*
|
||
0 1 2 3
|
||
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
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
|V=2|P| SC | PT=BYE=203 | length |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
| SSRC/CSRC |
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
: ... :
|
||
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
|
||
(opt) | length | reason for leaving ...
|
||
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
*/
|
||
|
||
class RtcpBye : public RtcpHeader {
|
||
public:
|
||
friend class RtcpHeader;
|
||
/* 变长，根据count决定有多少个ssrc */
|
||
uint32_t ssrc;
|
||
|
||
/** 中间可能有若干个 ssrc **/
|
||
|
||
/* 可选 */
|
||
uint8_t reason_len;
|
||
char reason[1];
|
||
|
||
public:
|
||
/**
|
||
* 创建bye包
|
||
* @param ssrc ssrc列表
|
||
* @param reason 原因
|
||
* @return rtcp bye包
|
||
*/
|
||
static std::shared_ptr<RtcpBye> create(const std::vector<uint32_t> &ssrc, const string &reason);
|
||
|
||
/**
|
||
* 获取ssrc列表
|
||
*/
|
||
vector<uint32_t *> getSSRC();
|
||
|
||
/**
|
||
* 获取原因
|
||
*/
|
||
string getReason() const;
|
||
|
||
private:
|
||
/**
|
||
* 打印字段详情
|
||
* 使用net2Host转换成主机字节序后才可使用此函数
|
||
*/
|
||
string dumpString() const;
|
||
|
||
/**
|
||
* 网络字节序转换为主机字节序
|
||
* @param size 字节长度，防止内存越界
|
||
*/
|
||
void net2Host(size_t size);
|
||
} PACKED;
|
||
|
||
#if defined(_WIN32)
|
||
#pragma pack(pop)
|
||
#endif // defined(_WIN32)
|
||
|
||
} //namespace mediakit
|
||
#endif //ZLMEDIAKIT_RTCP_H
|