mirror of
https://github.com/ZLMediaKit/ZLMediaKit.git
synced 2024-11-22 19:00:01 +08:00
542 lines
21 KiB
C++
542 lines
21 KiB
C++
/*
|
||
* 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"
|
||
#include "Sdp.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;
|
||
void setId(uint8_t id);
|
||
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;
|
||
void setId(uint8_t id);
|
||
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;
|
||
}
|
||
|
||
void RtpExtOneByte::setId(uint8_t in) {
|
||
id = in & 0x0F;
|
||
}
|
||
|
||
uint8_t *RtpExtOneByte::getData() {
|
||
return data;
|
||
}
|
||
|
||
//////////////////////////////////////////////////////////////////
|
||
|
||
size_t RtpExtTwoByte::getSize() const {
|
||
return len;
|
||
}
|
||
|
||
uint8_t RtpExtTwoByte::getId() const {
|
||
return id;
|
||
}
|
||
|
||
void RtpExtTwoByte::setId(uint8_t in) {
|
||
id = in;
|
||
}
|
||
|
||
uint8_t *RtpExtTwoByte::getData() {
|
||
return data;
|
||
}
|
||
|
||
//////////////////////////////////////////////////////////////////
|
||
|
||
static constexpr uint16_t kOneByteHeader = 0xBEDE;
|
||
static constexpr uint16_t kTwoByteHeader = 0x1000;
|
||
|
||
template<typename Type>
|
||
static bool isOneByteExt(){
|
||
return false;
|
||
}
|
||
|
||
template<>
|
||
static bool isOneByteExt<RtpExtOneByte>(){
|
||
return true;
|
||
}
|
||
|
||
template<typename Type>
|
||
static void appendExt(map<uint8_t, RtpExt> &ret, uint8_t *ptr, const uint8_t *end) {
|
||
while (ptr < end) {
|
||
auto ext = reinterpret_cast<Type *>(ptr);
|
||
if (ext->getId() == (uint8_t) RtpExtType::padding) {
|
||
//padding，忽略
|
||
++ptr;
|
||
continue;
|
||
}
|
||
//15类型的rtp ext为保留
|
||
CHECK(ext->getId() < (uint8_t) RtpExtType::reserved);
|
||
CHECK(reinterpret_cast<uint8_t *>(ext) + Type::kMinSize <= end);
|
||
CHECK(ext->getData() + ext->getSize() <= end);
|
||
ret.emplace(ext->getId(), RtpExt(ext, isOneByteExt<Type>(), reinterpret_cast<char *>(ext->getData()), ext->getSize()));
|
||
ptr += Type::kMinSize + ext->getSize();
|
||
}
|
||
}
|
||
|
||
RtpExt::RtpExt(void *ptr, bool one_byte_ext, const char *str, size_t size) : std::string(str, size) {
|
||
_ptr = ptr;
|
||
_one_byte_ext = one_byte_ext;
|
||
}
|
||
|
||
map<uint8_t/*id*/, RtpExt/*data*/> RtpExt::getExtValue(const RtpHeader *header) {
|
||
map<uint8_t, RtpExt> 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) {
|
||
appendExt<RtpExtOneByte>(ret, ptr, end);
|
||
return ret;
|
||
}
|
||
if ((reserved & 0xFFF0) >> 4 == kTwoByteHeader) {
|
||
appendExt<RtpExtTwoByte>(ret, ptr, end);
|
||
return ret;
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
#define RTP_EXT_MAP(XX) \
|
||
XX(ssrc_audio_level, "urn:ietf:params:rtp-hdrext:ssrc-audio-level") \
|
||
XX(abs_send_time, "http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time") \
|
||
XX(transport_cc, "http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01") \
|
||
XX(sdes_mid, "urn:ietf:params:rtp-hdrext:sdes:mid") \
|
||
XX(sdes_rtp_stream_id, "urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id") \
|
||
XX(sdes_repaired_rtp_stream_id, "urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id") \
|
||
XX(video_timing, "http://www.webrtc.org/experiments/rtp-hdrext/video-timing") \
|
||
XX(color_space, "http://www.webrtc.org/experiments/rtp-hdrext/color-space") \
|
||
XX(csrc_audio_level, "urn:ietf:params:rtp-hdrext:csrc-audio-level") \
|
||
XX(framemarking, "http://tools.ietf.org/html/draft-ietf-avtext-framemarking-07") \
|
||
XX(video_content_type, "http://www.webrtc.org/experiments/rtp-hdrext/video-content-type") \
|
||
XX(playout_delay, "http://www.webrtc.org/experiments/rtp-hdrext/playout-delay") \
|
||
XX(video_orientation, "urn:3gpp:video-orientation") \
|
||
XX(toffset, "urn:ietf:params:rtp-hdrext:toffset") \
|
||
XX(encrypt, "urn:ietf:params:rtp-hdrext:encrypt")
|
||
|
||
#define XX(type, url) {RtpExtType::type , url},
|
||
static unordered_map<RtpExtType/*id*/, string/*ext*/> s_type_to_url = {RTP_EXT_MAP(XX)};
|
||
#undef XX
|
||
|
||
|
||
#define XX(type, url) {url, RtpExtType::type},
|
||
static unordered_map<string/*ext*/, RtpExtType/*id*/> s_url_to_type = {RTP_EXT_MAP(XX)};
|
||
#undef XX
|
||
|
||
RtpExtType RtpExt::getExtType(const string &url) {
|
||
auto it = s_url_to_type.find(url);
|
||
if (it == s_url_to_type.end()) {
|
||
throw std::invalid_argument(string("未识别的rtp ext url类型:") + url);
|
||
}
|
||
return it->second;
|
||
}
|
||
|
||
const string &RtpExt::getExtUrl(RtpExtType type) {
|
||
auto it = s_type_to_url.find(type);
|
||
if (it == s_type_to_url.end()) {
|
||
throw std::invalid_argument(string("未识别的rtp ext类型:") + to_string((int) type));
|
||
}
|
||
return it->second;
|
||
}
|
||
|
||
const char *RtpExt::getExtName(RtpExtType type) {
|
||
#define XX(type, url) case RtpExtType::type: return #type;
|
||
switch (type) {
|
||
RTP_EXT_MAP(XX)
|
||
default: return "unknown ext type";
|
||
}
|
||
#undef XX
|
||
}
|
||
|
||
string RtpExt::dumpString() const {
|
||
_StrPrinter printer;
|
||
switch (_type) {
|
||
case RtpExtType::ssrc_audio_level : {
|
||
bool vad;
|
||
printer << "audio level:" << (int) getAudioLevel(&vad) << ", vad:" << vad;
|
||
break;
|
||
}
|
||
case RtpExtType::abs_send_time : {
|
||
printer << "abs send time:" << getAbsSendTime();
|
||
break;
|
||
}
|
||
case RtpExtType::transport_cc : {
|
||
printer << "twcc seq:" << getTransportCCSeq();
|
||
break;
|
||
}
|
||
case RtpExtType::sdes_mid : {
|
||
printer << "sdes mid:" << getSdesMid();
|
||
break;
|
||
}
|
||
case RtpExtType::sdes_rtp_stream_id : {
|
||
printer << "rtp stream id:" << getRtpStreamId();
|
||
break;
|
||
}
|
||
case RtpExtType::sdes_repaired_rtp_stream_id : {
|
||
printer << "rtp repaired stream id:" << getRepairedRtpStreamId();
|
||
break;
|
||
}
|
||
case RtpExtType::video_timing : {
|
||
uint8_t flags;
|
||
uint16_t encode_start, encode_finish, packetization_complete, last_pkt_left_pacer, reserved_net0, reserved_net1;
|
||
getVideoTiming(flags, encode_start, encode_finish, packetization_complete, last_pkt_left_pacer,
|
||
reserved_net0, reserved_net1);
|
||
printer << "video timing, flags:" << (int) flags
|
||
<< ",encode:" << encode_start << "-" << encode_finish
|
||
<< ",packetization_complete:" << packetization_complete
|
||
<< ",last_pkt_left_pacer:" << last_pkt_left_pacer
|
||
<< ",reserved_net0:" << reserved_net0
|
||
<< ",reserved_net1:" << reserved_net1;
|
||
break;
|
||
}
|
||
case RtpExtType::video_content_type : {
|
||
printer << "video content type:" << (int)getVideoContentType();
|
||
break;
|
||
}
|
||
case RtpExtType::video_orientation : {
|
||
bool camera_bit, flip_bit, first_rotation, second_rotation;
|
||
getVideoOrientation(camera_bit, flip_bit, first_rotation, second_rotation);
|
||
printer << "video orientation:" << camera_bit << "-" << flip_bit << "-" << first_rotation << "-" << second_rotation;
|
||
break;
|
||
}
|
||
case RtpExtType::playout_delay : {
|
||
uint16_t min_delay, max_delay;
|
||
getPlayoutDelay(min_delay, max_delay);
|
||
printer << "playout delay:" << min_delay << "-" << max_delay;
|
||
break;
|
||
}
|
||
case RtpExtType::toffset : {
|
||
printer << "toffset:" << getTransmissionOffset();
|
||
break;
|
||
}
|
||
case RtpExtType::framemarking : {
|
||
printer << "framemarking tid:" << getFramemarkingTID();
|
||
break;
|
||
}
|
||
default: {
|
||
printer << getExtName(_type) << ", hex:" << hexdump(data(), size());
|
||
break;
|
||
}
|
||
}
|
||
return std::move(printer);
|
||
}
|
||
|
||
//https://tools.ietf.org/html/rfc6464
|
||
// 0 1
|
||
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// | ID | len=0 |V| level |
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
//
|
||
// Figure 1: Sample Audio Level Encoding Using the
|
||
// One-Byte Header Format
|
||
//
|
||
//
|
||
// 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
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// | ID | len=1 |V| level | 0 (pad) |
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
//
|
||
// Figure 2: Sample Audio Level Encoding Using the
|
||
// Two-Byte Header Format
|
||
uint8_t RtpExt::getAudioLevel(bool *vad) const{
|
||
CHECK(_type == RtpExtType::ssrc_audio_level && size() >= 1);
|
||
auto &byte = (*this)[0];
|
||
if (vad) {
|
||
*vad = byte & 0x80;
|
||
}
|
||
return byte & 0x7F;
|
||
}
|
||
|
||
//http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
|
||
//Wire format: 1-byte extension, 3 bytes of data. total 4 bytes extra per packet (plus shared 4 bytes for all extensions present: 2 byte magic word 0xBEDE, 2 byte # of extensions). Will in practice replace the “toffset” extension so we should see no long term increase in traffic as a result.
|
||
//
|
||
//Encoding: Timestamp is in seconds, 24 bit 6.18 fixed point, yielding 64s wraparound and 3.8us resolution (one increment for each 477 bytes going out on a 1Gbps interface).
|
||
//
|
||
//Relation to NTP timestamps: abs_send_time_24 = (ntp_timestamp_64 >> 14) & 0x00ffffff ; NTP timestamp is 32 bits for whole seconds, 32 bits fraction of second.
|
||
//
|
||
//Notes: Packets are time stamped when going out, preferably close to metal. Intermediate RTP relays (entities possibly altering the stream) should remove the extension or set its own timestamp.
|
||
uint32_t RtpExt::getAbsSendTime() const {
|
||
CHECK(_type == RtpExtType::abs_send_time && size() >= 3);
|
||
uint32_t ret = 0;
|
||
ret |= (*this)[0] << 16;
|
||
ret |= (*this)[1] << 8;
|
||
ret |= (*this)[2];
|
||
return ret;
|
||
}
|
||
|
||
//https://tools.ietf.org/html/draft-holmer-rmcat-transport-wide-cc-extensions-01
|
||
// 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=1 |
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// | ID | L=1 |transport-wide sequence number | zero padding |
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
uint16_t RtpExt::getTransportCCSeq() const {
|
||
CHECK(_type == RtpExtType::transport_cc && size() >= 2);
|
||
uint16_t ret;
|
||
ret |= (*this)[0] << 8;
|
||
ret |= (*this)[1];
|
||
return ret;
|
||
}
|
||
|
||
//https://tools.ietf.org/html/draft-ietf-avtext-sdes-hdr-ext-07
|
||
// 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
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// | ID | len | SDES Item text value ... |
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
const string &RtpExt::getSdesMid() const {
|
||
CHECK(_type == RtpExtType::sdes_mid && size() >= 1);
|
||
return *this;
|
||
}
|
||
|
||
|
||
//https://tools.ietf.org/html/draft-ietf-avtext-rid-06
|
||
//用于simulecast
|
||
//3.1. RTCP 'RtpStreamId' SDES Extension
|
||
//
|
||
// 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
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// |RtpStreamId=TBD| length | RtpStreamId ...
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
//
|
||
//
|
||
// The RtpStreamId payload is UTF-8 encoded and is not null-terminated.
|
||
//
|
||
// RFC EDITOR NOTE: Please replace TBD with the assigned SDES
|
||
// identifier value.
|
||
|
||
//3.2. RTCP 'RepairedRtpStreamId' SDES Extension
|
||
//
|
||
// 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
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// |Repaired...=TBD| length | RepairRtpStreamId ...
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
//
|
||
//
|
||
// The RepairedRtpStreamId payload is UTF-8 encoded and is not null-
|
||
// terminated.
|
||
//
|
||
// RFC EDITOR NOTE: Please replace TBD with the assigned SDES
|
||
// identifier value.
|
||
|
||
string RtpExt::getRtpStreamId() const {
|
||
CHECK(_type == RtpExtType::sdes_rtp_stream_id && size() >= 1);
|
||
return *this;
|
||
}
|
||
|
||
string RtpExt::getRepairedRtpStreamId() const {
|
||
CHECK(_type == RtpExtType::sdes_repaired_rtp_stream_id && size() >= 1);
|
||
return *this;
|
||
}
|
||
|
||
|
||
//http://www.webrtc.org/experiments/rtp-hdrext/video-timing
|
||
//Wire format: 1-byte extension, 13 bytes of data. Total 14 bytes extra per packet (plus 1-3 padding byte in some cases, plus shared 4 bytes for all extensions present: 2 byte magic word 0xBEDE, 2 byte # of extensions).
|
||
//
|
||
//First byte is a flags field. Defined flags:
|
||
//
|
||
//0x01 - extension is set due to timer.
|
||
//0x02 - extension is set because the frame is larger than usual.
|
||
//Both flags may be set at the same time. All remaining 6 bits are reserved and should be ignored.
|
||
//
|
||
//Next, 6 timestamps are stored as 16-bit values in big-endian order, representing delta from the capture time of a packet in ms. Timestamps are, in order:
|
||
//
|
||
//Encode start.
|
||
//Encode finish.
|
||
//Packetization complete.
|
||
//Last packet left the pacer.
|
||
//Reserved for network.
|
||
//Reserved for network (2).
|
||
|
||
void RtpExt::getVideoTiming(uint8_t &flags,
|
||
uint16_t &encode_start,
|
||
uint16_t &encode_finish,
|
||
uint16_t &packetization_complete,
|
||
uint16_t &last_pkt_left_pacer,
|
||
uint16_t &reserved_net0,
|
||
uint16_t &reserved_net1) const {
|
||
CHECK(_type == RtpExtType::video_timing && size() >= 13);
|
||
flags = (*this)[0];
|
||
encode_start = (*this)[1] << 8 | (*this)[2];
|
||
encode_finish = (*this)[3] << 8 | (*this)[4];
|
||
packetization_complete = (*this)[5] << 8 | (*this)[6];
|
||
last_pkt_left_pacer = (*this)[7] << 8 | (*this)[8];
|
||
reserved_net0 = (*this)[9] << 8 | (*this)[10];
|
||
reserved_net1 = (*this)[11] << 8 | (*this)[12];
|
||
}
|
||
|
||
|
||
//http://www.webrtc.org/experiments/rtp-hdrext/color-space
|
||
// 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
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// | ID | L = 3 | primaries | transfer | matrix |
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// |range+chr.sit. |
|
||
// +-+-+-+-+-+-+-+-+
|
||
|
||
|
||
//http://www.webrtc.org/experiments/rtp-hdrext/video-content-type
|
||
//Values:
|
||
//0x00: Unspecified. Default value. Treated the same as an absence of an extension.
|
||
//0x01: Screenshare. Video stream is of a screenshare type.
|
||
//0x02: 摄像头？
|
||
//Notes: Extension shoud be present only in the last packet of key-frames.
|
||
// If attached to other packets it should be ignored.
|
||
// If extension is absent, Unspecified value is assumed.
|
||
uint8_t RtpExt::getVideoContentType() const {
|
||
CHECK(_type == RtpExtType::video_content_type && size() >= 1);
|
||
return (*this)[0];
|
||
}
|
||
|
||
//http://www.3gpp.org/ftp/Specs/html-info/26114.htm
|
||
void RtpExt::getVideoOrientation(bool &camera_bit, bool &flip_bit, bool &first_rotation, bool &second_rotation) const {
|
||
CHECK(_type == RtpExtType::video_orientation && size() >= 1);
|
||
uint8_t byte = (*this)[0];
|
||
camera_bit = (byte & 0x08) >> 3;
|
||
flip_bit = (byte & 0x04) >> 2;
|
||
first_rotation = (byte & 0x02) >> 1;
|
||
second_rotation = byte & 0x01;
|
||
}
|
||
|
||
//http://www.webrtc.org/experiments/rtp-hdrext/playout-delay
|
||
// 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
|
||
//+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
//| ID | len=2 | MIN delay | MAX delay |
|
||
//+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
void RtpExt::getPlayoutDelay(uint16_t &min_delay, uint16_t &max_delay) const {
|
||
CHECK(_type == RtpExtType::playout_delay && size() >= 3);
|
||
uint32_t bytes = (*this)[0] << 16 | (*this)[1] << 8 | (*this)[2];
|
||
min_delay = (bytes & 0x00FFF000) >> 12;
|
||
max_delay = bytes & 0x00000FFF;
|
||
}
|
||
|
||
//urn:ietf:params:rtp-hdrext:toffset
|
||
//https://tools.ietf.org/html/rfc5450
|
||
// 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
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// | ID | len=2 | transmission offset |
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
uint32_t RtpExt::getTransmissionOffset() const {
|
||
CHECK(_type == RtpExtType::toffset && size() >= 3);
|
||
return (*this)[0] << 16 | (*this)[1] << 8 | (*this)[2];
|
||
}
|
||
|
||
//http://tools.ietf.org/html/draft-ietf-avtext-framemarking-07
|
||
// 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
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
// | ID=? | L=2 |S|E|I|D|B| TID | LID | TL0PICIDX |
|
||
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|
||
uint8_t RtpExt::getFramemarkingTID() const {
|
||
CHECK(_type == RtpExtType::framemarking && size() >= 3);
|
||
return (*this)[0] & 0x07;
|
||
}
|
||
|
||
void RtpExt::setExtId(uint8_t ext_id) {
|
||
assert(ext_id > (int) RtpExtType::padding && ext_id <= (int) RtpExtType::reserved && _ptr);
|
||
if (_one_byte_ext) {
|
||
auto ptr = reinterpret_cast<RtpExtOneByte *>(_ptr);
|
||
ptr->setId(ext_id);
|
||
} else {
|
||
auto ptr = reinterpret_cast<RtpExtTwoByte *>(_ptr);
|
||
ptr->setId(ext_id);
|
||
}
|
||
}
|
||
|
||
void RtpExt::clearExt(){
|
||
assert(_ptr);
|
||
if (_one_byte_ext) {
|
||
auto ptr = reinterpret_cast<RtpExtOneByte *>(_ptr);
|
||
memset(ptr, (int) RtpExtType::padding, RtpExtOneByte::kMinSize + ptr->getSize());
|
||
} else {
|
||
auto ptr = reinterpret_cast<RtpExtTwoByte *>(_ptr);
|
||
memset(ptr, (int) RtpExtType::padding, RtpExtTwoByte::kMinSize + ptr->getSize());
|
||
}
|
||
}
|
||
|
||
void RtpExt::setType(RtpExtType type) {
|
||
_type = type;
|
||
}
|