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添加一些rtcp fci相关定义

This commit is contained in:
xia-chu 2021-04-13 18:50:20 +08:00
parent 69148d28de
commit f939e0a894
4 changed files with 219 additions and 1 deletions
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10
src/Rtcp/Rtcp.cpp
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@ -33,6 +33,15 @@ const char *sdesTypeToStr(SdesType type){
}
}
const char *psfbTypeToStr(PSFBType type) {
switch (type){
#define SWITCH_CASE(key, value) case PSFBType::key : return #value "(" #key ")";
PSFB_TYPE_MAP(SWITCH_CASE)
#undef SWITCH_CASE
default: return "unknown payload-specific fb message (rfc4585) type";
}
}
static size_t alignSize(size_t bytes) {
return (size_t)((bytes + 3) / 4) << 2;
}
@ -136,6 +145,7 @@ void RtcpHeader::net2Host(size_t len){
case RtcpType::RTCP_RTPFB: {
//todo 支持rtcp-fb相关功能
net2Host();
break;
}
default: throw std::runtime_error(StrPrinter << "未处理的rtcp包:" << rtcpTypeToStr((RtcpType) this->pt));

57
src/Rtcp/Rtcp.h
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@ -55,6 +55,33 @@ namespace mediakit {
XX(RTCP_SDES_NOTE, 7) \
XX(RTCP_SDES_PRIVATE, 8)
//https://datatracker.ietf.org/doc/rfc4585/?include_text=1
//6.3. Payload-Specific Feedback Messages
//
// Payload-Specific FB messages are identified by the value PT=PSFB as
// RTCP message type.
//
// Three payload-specific FB messages are defined so far plus an
// application layer FB message. They are identified by means of the
// FMT parameter as follows:
//
// 0: unassigned
// 1: Picture Loss Indication (PLI)
// 2: Slice Loss Indication (SLI)
// 3: Reference Picture Selection Indication (RPSI)
// 4-14: unassigned
// 15: Application layer FB (AFB) message
// 16-30: unassigned
// 31: reserved for future expansion of the sequence number space
#define PSFB_TYPE_MAP(XX) \
XX(RTCP_PSFB_PLI, 1) \
XX(RTCP_PSFB_SLI, 2) \
XX(RTCP_PSFB_RPSI, 3) \
XX(RTCP_PSFB_FIR, 4) \
XX(RTCP_PSFB_TSTR, 5) \
XX(RTCP_PSFB_AFB, 15)
//rtcp类型枚举
enum class RtcpType : uint8_t {
#define XX(key, value) key = value,
@ -69,6 +96,13 @@ enum class SdesType : uint8_t {
#undef XX
};
//psfb类型枚举
enum class PSFBType : uint8_t {
#define XX(key, value) key = value,
PSFB_TYPE_MAP(XX)
#undef XX
};
/**
* RtcpType转描述字符串
*/
@ -79,6 +113,11 @@ const char *rtcpTypeToStr(RtcpType type);
*/
const char *sdesTypeToStr(SdesType type);
/**
* psfb枚举转描述字符串
*/
const char *psfbTypeToStr(PSFBType type);
class RtcpHeader {
public:
#if __BYTE_ORDER == __BIG_ENDIAN
@ -462,7 +501,23 @@ private:
void net2Host(size_t size);
} PACKED;
//PLI
//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) :
// : :
class RtcpPli : public RtcpHeader {
public:
friend class RtcpHeader;

5
src/Rtcp/RtcpFCI.cpp Normal file
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@ -0,0 +1,5 @@
//
// Created by xzl on 2021/4/13.
//
#include "RtcpFCI.h"

148
src/Rtcp/RtcpFCI.h Normal file
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@ -0,0 +1,148 @@
/*
* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
*
* This file is part of ZLMediaKit(https://github.com/xia-chu/ZLMediaKit).
*
* Use of this source code is governed by MIT license that can be found in the
* LICENSE file in the root of the source tree. All contributing project authors
* may be found in the AUTHORS file in the root of the source tree.
*/
#ifndef ZLMEDIAKIT_RTCPFCI_H
#define ZLMEDIAKIT_RTCPFCI_H
#include "Rtcp.h"
//https://tools.ietf.org/html/rfc4585
namespace mediakit {
//https://tools.ietf.org/html/rfc4585#section-6.2.1
// 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
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | PID | BLP |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// Figure 4: Syntax for the Generic NACK message
class FCI_NACK {
public:
// The PID field is used to specify a lost packet. The PID field
// refers to the RTP sequence number of the lost packet.
uint16_t pid;
// bitmask of following lost packets (BLP): 16 bits
uint16_t blp;
} PACKED;
//https://tools.ietf.org/html/rfc4585#section-6.3.2.2
// The Slice Loss Indication uses one additional FCI field, the content
// of which is depicted in Figure 6. The length of the FB message MUST
// be set to 2+n, with n being the number of SLIs contained in the FCI
// field.
//
// 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
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | First | Number | PictureID |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// Figure 6: Syntax of the Slice Loss Indication (SLI)
//
class FCI_SLI {
public:
uint32_t first : 13;
uint32_t number : 13;
uint32_t pic_id : 6;
} PACKED;
//https://tools.ietf.org/html/rfc4585#section-6.3.3.2
//6.3.3.2. Format
//
// The FCI for the RPSI message follows the format depicted in Figure 7:
//
// 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
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | PB |0| Payload Type| Native RPSI bit string |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | defined per codec ... | Padding (0) |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//
// Figure 7: Syntax of the Reference Picture Selection Indication (RPSI)
class FCI_RPSI {
public:
//The number of unused bits required to pad the length of the RPSI
// message to a multiple of 32 bits.
uint8_t pb;
#if __BYTE_ORDER == __BIG_ENDIAN
//0: 1 bit
// MUST be set to zero upon transmission and ignored upon reception.
uint8_t zero : 1;
//Payload Type: 7 bits
// Indicates the RTP payload type in the context of which the native
// RPSI bit string MUST be interpreted.
uint8_t pt : 7;
#else
uint8_t pt: 7;
uint8_t zero: 1;
#endif
// Native RPSI bit string: variable length
// The RPSI information as natively defined by the video codec.
char str[1];
//Padding: #PB bits
// A number of bits set to zero to fill up the contents of the RPSI
// message to the next 32-bit boundary. The number of padding bits
// MUST be indicated by the PB field.
} PACKED;
//tools.ietf.org/html/draft-alvestrand-rmcat-remb-03
// 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=15 | PT=206 | length |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | SSRC of packet sender |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | SSRC of media source |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Unique identifier 'R' 'E' 'M' 'B' |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | Num SSRC | BR Exp | BR Mantissa |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | SSRC feedback |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | ... |
class FCI_REMB {
public:
//Unique identifier 'R' 'E' 'M' 'B'
char magic[4];
//Number of SSRCs in this message.
uint32_t num_ssrc : 8;
// BR Exp (6 bits): The exponential scaling of the mantissa for the
// maximum total media bit rate value, ignoring all packet
// overhead. The value is an unsigned integer [0..63], as
// in RFC 5104 section 4.2.2.1.
uint32_t br_exp : 6;
//BR Mantissa (18 bits): The mantissa of the maximum total media bit
// rate (ignoring all packet overhead) that the sender of
// the REMB estimates. The BR is the estimate of the
// traveled path for the SSRCs reported in this message.
// The value is an unsigned integer in number of bits per
// second.
uint32_t br_mantissa : 18;
// SSRC feedback (32 bits) Consists of one or more SSRC entries which
// this feedback message applies to.
uint32_t ssrc_feedback;
} PACKED;
} //namespace mediakit
#endif //ZLMEDIAKIT_RTCPFCI_H