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添加rtp ext解析相关代码

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xia-chu 2021-05-06 16:25:18 +08:00
parent 842257edaa
commit d337b8d864
2 changed files with 186 additions and 0 deletions
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157
webrtc/RtpExt.cpp Normal file
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/*
* 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.
*/
#include "RtpExt.h"
#if defined(_WIN32)
#pragma pack(push, 1)
#endif // defined(_WIN32)
//https://tools.ietf.org/html/draft-holmer-rmcat-transport-wide-cc-extensions-01
//https://tools.ietf.org/html/rfc5285
// 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
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | 0xBE | 0xDE | length=3 |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | ID | L=0 | data | ID | L=1 | data...
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// ...data | 0 (pad) | 0 (pad) | ID | L=3 |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | data |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
class RtpExtOneByte {
public:
static constexpr uint16_t kMinSize = 1;
size_t getSize() const;
uint8_t getId() const;
uint8_t* getData();
private:
#if __BYTE_ORDER == __BIG_ENDIAN
uint8_t id: 4;
uint8_t len: 4;
#else
uint8_t len: 4;
uint8_t id: 4;
#endif
uint8_t data[1];
} PACKED;
//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
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | 0x100 |appbits| length=3 |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | ID | L=0 | ID | L=1 |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | data | 0 (pad) | ID | L=4 |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// | data |
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
class RtpExtTwoByte {
public:
static constexpr uint16_t kMinSize = 2;
size_t getSize() const;
uint8_t getId() const;
uint8_t* getData();
private:
uint8_t id;
uint8_t len;
uint8_t data[1];
} PACKED;
#if defined(_WIN32)
#pragma pack(pop)
#endif // defined(_WIN32)
//////////////////////////////////////////////////////////////////
size_t RtpExtOneByte::getSize() const {
return len + 1;
}
uint8_t RtpExtOneByte::getId() const {
return id;
}
uint8_t *RtpExtOneByte::getData() {
return data;
}
//////////////////////////////////////////////////////////////////
size_t RtpExtTwoByte::getSize() const {
return len;
}
uint8_t RtpExtTwoByte::getId() const {
return id;
}
uint8_t *RtpExtTwoByte::getData() {
return data;
}
//////////////////////////////////////////////////////////////////
static constexpr uint16_t kOneByteHeader = 0xBEDE;
static constexpr uint16_t kTwoByteHeader = 0x1000;
map<uint8_t/*id*/, string/*data*/> RtpExt::getExtValue(const RtpHeader *header) {
map<uint8_t, string> ret;
assert(header);
auto ext_size = header->getExtSize();
if (!ext_size) {
return ret;
}
auto reserved = header->getExtReserved();
auto ptr = const_cast<RtpHeader *>(header)->getExtData();
auto end = ptr + ext_size;
if (reserved == kOneByteHeader) {
while (ptr < end) {
RtpExtOneByte *ext = reinterpret_cast<RtpExtOneByte *>(ptr);
if (ext->getId() == 0) {
//padding，忽略
++ptr;
continue;
}
//15类型的rtp ext为保留
CHECK(ext->getId() != 15);
CHECK(reinterpret_cast<uint8_t *>(ext) + RtpExtOneByte::kMinSize <= end);
CHECK(ext->getData() + ext->getSize() <= end);
ret.emplace(ext->getId(), string(reinterpret_cast<char *>(ext->getData()), ext->getSize()));
ptr += RtpExtOneByte::kMinSize + ext->getSize();
}
return ret;
}
if ((reserved & 0xFFF0) >> 4 == kTwoByteHeader) {
while (ptr < end) {
RtpExtTwoByte *ext = reinterpret_cast<RtpExtTwoByte *>(ptr);
if (ext->getId() == 0) {
//padding，忽略
++ptr;
continue;
}
CHECK(reinterpret_cast<uint8_t *>(ext) + RtpExtTwoByte::kMinSize <= end);
CHECK(ext->getData() + ext->getSize() <= end);
ret.emplace(ext->getId(), string(reinterpret_cast<char *>(ext->getData()), ext->getSize()));
ptr += RtpExtTwoByte::kMinSize + ext->getSize();
}
return ret;
}
return ret;
}

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webrtc/RtpExt.h Normal file
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/*
* 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_RTPEXT_H
#define ZLMEDIAKIT_RTPEXT_H
#include <stdint.h>
#include <map>
#include <string>
#include "Common/macros.h"
#include "Rtsp/Rtsp.h"
using namespace std;
using namespace mediakit;
class RtpExt {
public:
static map<uint8_t/*id*/, string/*data*/> getExtValue(const RtpHeader *header);
};
#endif //ZLMEDIAKIT_RTPEXT_H