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index.html
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<!doctype html><html lang="en">
<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<meta content="width=device-width, initial-scale=1, shrink-to-fit=no" name="viewport">
<title>WebRTC RTP Transport</title>
<meta content="UD" name="w3c-status">
<link href="https://www.w3.org/StyleSheets/TR/2021/W3C-UD" rel="stylesheet">
<meta content="Bikeshed version ac5ea272d, updated Fri Dec 6 15:45:15 2024 -0800" name="generator">
<link href="https://www.w3.org/TR/webrtc-rtptransport/" rel="canonical">
<meta content="dark light" name="color-scheme">
<link href="https://www.w3.org/StyleSheets/TR/2021/dark.css" media="(prefers-color-scheme: dark)" rel="stylesheet" type="text/css">
<style>
main > dl > dd {
margin-bottom: 1em;
}
table {
width: 100%;
}
table#sample-types td, table#sample-types th {
text-align: center;
}
table#sample-types .even {
background-color: lightgrey;
}
.rfc2119 {
text-transform: lowercase;
font-variant: small-caps;
font-style: normal;
}
</style>
<style>/* Boilerplate: style-autolinks */
.css.css, .property.property, .descriptor.descriptor {
color: var(--a-normal-text);
font-size: inherit;
font-family: inherit;
}
.css::before, .property::before, .descriptor::before {
content: "‘";
}
.css::after, .property::after, .descriptor::after {
content: "’";
}
.property, .descriptor {
/* Don't wrap property and descriptor names */
white-space: nowrap;
}
.type { /* CSS value <type> */
font-style: italic;
}
pre .property::before, pre .property::after {
content: "";
}
[data-link-type="property"]::before,
[data-link-type="propdesc"]::before,
[data-link-type="descriptor"]::before,
[data-link-type="value"]::before,
[data-link-type="function"]::before,
[data-link-type="at-rule"]::before,
[data-link-type="selector"]::before,
[data-link-type="maybe"]::before {
content: "‘";
}
[data-link-type="property"]::after,
[data-link-type="propdesc"]::after,
[data-link-type="descriptor"]::after,
[data-link-type="value"]::after,
[data-link-type="function"]::after,
[data-link-type="at-rule"]::after,
[data-link-type="selector"]::after,
[data-link-type="maybe"]::after {
content: "’";
}
[data-link-type].production::before,
[data-link-type].production::after,
.prod [data-link-type]::before,
.prod [data-link-type]::after {
content: "";
}
[data-link-type=element],
[data-link-type=element-attr] {
font-family: Menlo, Consolas, "DejaVu Sans Mono", monospace;
font-size: .9em;
}
[data-link-type=element]::before { content: "<" }
[data-link-type=element]::after { content: ">" }
[data-link-type=biblio] {
white-space: pre;
}
@media (prefers-color-scheme: dark) {
:root {
--selflink-text: black;
--selflink-bg: silver;
--selflink-hover-text: white;
}
}
</style>
<style>/* Boilerplate: style-colors */
/* Any --*-text not paired with a --*-bg is assumed to have a transparent bg */
:root {
color-scheme: light dark;
--text: black;
--bg: white;
--unofficial-watermark: url(https://www.w3.org/StyleSheets/TR/2016/logos/UD-watermark);
--logo-bg: #1a5e9a;
--logo-active-bg: #c00;
--logo-text: white;
--tocnav-normal-text: #707070;
--tocnav-normal-bg: var(--bg);
--tocnav-hover-text: var(--tocnav-normal-text);
--tocnav-hover-bg: #f8f8f8;
--tocnav-active-text: #c00;
--tocnav-active-bg: var(--tocnav-normal-bg);
--tocsidebar-text: var(--text);
--tocsidebar-bg: #f7f8f9;
--tocsidebar-shadow: rgba(0,0,0,.1);
--tocsidebar-heading-text: hsla(203,20%,40%,.7);
--toclink-text: var(--text);
--toclink-underline: #3980b5;
--toclink-visited-text: var(--toclink-text);
--toclink-visited-underline: #054572;
--heading-text: #005a9c;
--hr-text: var(--text);
--algo-border: #def;
--del-text: red;
--del-bg: transparent;
--ins-text: #080;
--ins-bg: transparent;
--a-normal-text: #034575;
--a-normal-underline: #bbb;
--a-visited-text: var(--a-normal-text);
--a-visited-underline: #707070;
--a-hover-bg: rgba(75%, 75%, 75%, .25);
--a-active-text: #c00;
--a-active-underline: #c00;
--blockquote-border: silver;
--blockquote-bg: transparent;
--blockquote-text: currentcolor;
--issue-border: #e05252;
--issue-bg: #fbe9e9;
--issue-text: var(--text);
--issueheading-text: #831616;
--example-border: #e0cb52;
--example-bg: #fcfaee;
--example-text: var(--text);
--exampleheading-text: #574b0f;
--note-border: #52e052;
--note-bg: #e9fbe9;
--note-text: var(--text);
--noteheading-text: hsl(120, 70%, 30%);
--notesummary-underline: silver;
--assertion-border: #aaa;
--assertion-bg: #eee;
--assertion-text: black;
--advisement-border: orange;
--advisement-bg: #fec;
--advisement-text: var(--text);
--advisementheading-text: #b35f00;
--warning-border: red;
--warning-bg: hsla(40,100%,50%,0.95);
--warning-text: var(--text);
--amendment-border: #330099;
--amendment-bg: #F5F0FF;
--amendment-text: var(--text);
--amendmentheading-text: #220066;
--def-border: #8ccbf2;
--def-bg: #def;
--def-text: var(--text);
--defrow-border: #bbd7e9;
--datacell-border: silver;
--indexinfo-text: #707070;
--indextable-hover-text: black;
--indextable-hover-bg: #f7f8f9;
--outdatedspec-bg: rgba(0, 0, 0, .5);
--outdatedspec-text: black;
--outdated-bg: maroon;
--outdated-text: white;
--outdated-shadow: red;
--editedrec-bg: darkorange;
}
@media (prefers-color-scheme: dark) {
:root {
--text: #ddd;
--bg: black;
--unofficial-watermark: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='400' height='400'%3E%3Cg fill='%23100808' transform='translate(200 200) rotate(-45) translate(-200 -200)' stroke='%23100808' stroke-width='3'%3E%3Ctext x='50%25' y='220' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EUNOFFICIAL%3C/text%3E%3Ctext x='50%25' y='305' style='font: bold 70px sans-serif; text-anchor: middle; letter-spacing: 6px;'%3EDRAFT%3C/text%3E%3C/g%3E%3C/svg%3E");
--logo-bg: #1a5e9a;
--logo-active-bg: #c00;
--logo-text: white;
--tocnav-normal-text: #999;
--tocnav-normal-bg: var(--bg);
--tocnav-hover-text: var(--tocnav-normal-text);
--tocnav-hover-bg: #080808;
--tocnav-active-text: #f44;
--tocnav-active-bg: var(--tocnav-normal-bg);
--tocsidebar-text: var(--text);
--tocsidebar-bg: #080808;
--tocsidebar-shadow: rgba(255,255,255,.1);
--tocsidebar-heading-text: hsla(203,20%,40%,.7);
--toclink-text: var(--text);
--toclink-underline: #6af;
--toclink-visited-text: var(--toclink-text);
--toclink-visited-underline: #054572;
--heading-text: #8af;
--hr-text: var(--text);
--algo-border: #456;
--del-text: #f44;
--del-bg: transparent;
--ins-text: #4a4;
--ins-bg: transparent;
--a-normal-text: #6af;
--a-normal-underline: #555;
--a-visited-text: var(--a-normal-text);
--a-visited-underline: var(--a-normal-underline);
--a-hover-bg: rgba(25%, 25%, 25%, .2);
--a-active-text: #f44;
--a-active-underline: var(--a-active-text);
--borderedblock-bg: rgba(255, 255, 255, .05);
--blockquote-border: silver;
--blockquote-bg: var(--borderedblock-bg);
--blockquote-text: currentcolor;
--issue-border: #e05252;
--issue-bg: var(--borderedblock-bg);
--issue-text: var(--text);
--issueheading-text: hsl(0deg, 70%, 70%);
--example-border: hsl(50deg, 90%, 60%);
--example-bg: var(--borderedblock-bg);
--example-text: var(--text);
--exampleheading-text: hsl(50deg, 70%, 70%);
--note-border: hsl(120deg, 100%, 35%);
--note-bg: var(--borderedblock-bg);
--note-text: var(--text);
--noteheading-text: hsl(120, 70%, 70%);
--notesummary-underline: silver;
--assertion-border: #444;
--assertion-bg: var(--borderedblock-bg);
--assertion-text: var(--text);
--advisement-border: orange;
--advisement-bg: #222218;
--advisement-text: var(--text);
--advisementheading-text: #f84;
--warning-border: red;
--warning-bg: hsla(40,100%,20%,0.95);
--warning-text: var(--text);
--amendment-border: #330099;
--amendment-bg: #080010;
--amendment-text: var(--text);
--amendmentheading-text: #cc00ff;
--def-border: #8ccbf2;
--def-bg: #080818;
--def-text: var(--text);
--defrow-border: #136;
--datacell-border: silver;
--indexinfo-text: #aaa;
--indextable-hover-text: var(--text);
--indextable-hover-bg: #181818;
--outdatedspec-bg: rgba(255, 255, 255, .5);
--outdatedspec-text: black;
--outdated-bg: maroon;
--outdated-text: white;
--outdated-shadow: red;
--editedrec-bg: darkorange;
}
/* In case a transparent-bg image doesn't expect to be on a dark bg,
which is quite common in practice... */
img { background: white; }
}
</style>
<style>/* Boilerplate: style-counters */
body {
counter-reset: example figure issue;
}
.issue {
counter-increment: issue;
}
.issue:not(.no-marker)::before {
content: "Issue " counter(issue);
}
.example {
counter-increment: example;
}
.example:not(.no-marker)::before {
content: "Example " counter(example);
}
.invalid.example:not(.no-marker)::before,
.illegal.example:not(.no-marker)::before {
content: "Invalid Example" counter(example);
}
figcaption {
counter-increment: figure;
}
figcaption:not(.no-marker)::before {
content: "Figure " counter(figure) " ";
}
</style>
<style>/* Boilerplate: style-dfn-panel */
:root {
--dfnpanel-bg: #ddd;
--dfnpanel-text: var(--text);
--dfnpanel-target-bg: #ffc;
--dfnpanel-target-outline: orange;
}
@media (prefers-color-scheme: dark) {
:root {
--dfnpanel-bg: #222;
--dfnpanel-text: var(--text);
--dfnpanel-target-bg: #333;
--dfnpanel-target-outline: silver;
}
}
.dfn-panel {
position: absolute;
z-index: 35;
width: 20em;
width: 300px;
height: auto;
max-height: 500px;
overflow: auto;
padding: 0.5em 0.75em;
font: small Helvetica Neue, sans-serif, Droid Sans Fallback;
background: var(--dfnpanel-bg);
color: var(--dfnpanel-text);
border: outset 0.2em;
white-space: normal; /* in case it's moved into a pre */
}
.dfn-panel:not(.on) { display: none; }
.dfn-panel * { margin: 0; padding: 0; text-indent: 0; }
.dfn-panel > b { display: block; }
.dfn-panel a { color: var(--dfnpanel-text); }
.dfn-panel a:not(:hover) { text-decoration: none !important; border-bottom: none !important; }
.dfn-panel a:focus {
outline: 5px auto Highlight;
outline: 5px auto -webkit-focus-ring-color;
}
.dfn-panel > b + b { margin-top: 0.25em; }
.dfn-panel ul { padding: 0 0 0 1em; list-style: none; }
.dfn-panel li a {
max-width: calc(300px - 1.5em - 1em);
overflow: hidden;
text-overflow: ellipsis;
}
.dfn-panel.activated {
display: inline-block;
position: fixed;
left: 8px;
bottom: 2em;
margin: 0 auto;
max-width: calc(100vw - 1.5em - .4em - .5em);
max-height: 30vh;
transition: left 1s ease-out, bottom 1s ease-out;
}
.dfn-panel .link-item:hover {
text-decoration: underline;
}
.dfn-panel .link-item .copy-icon {
opacity: 0;
}
.dfn-panel .link-item:hover .copy-icon,
.dfn-panel .link-item .copy-icon:focus {
opacity: 1;
}
.dfn-panel .copy-icon {
display: inline-block;
margin-right: 0.5em;
width: 0.85em;
height: 1em;
border-radius: 3px;
background-color: #ccc;
cursor: pointer;
}
.dfn-panel .copy-icon .icon {
width: 100%;
height: 100%;
background-color: #fff;
display: flex;
justify-content: center;
align-items: center;
position: relative;
}
.dfn-panel .copy-icon .icon::before {
content: "";
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
border: 1px solid black;
background-color: #ccc;
opacity: 0.25;
transform: translate(3px, -3px);
}
.dfn-panel .copy-icon:active .icon::before {
opacity: 1;
}
.dfn-paneled[role="button"] { cursor: help; }
.highlighted {
animation: target-fade 3s;
}
@keyframes target-fade {
from {
background-color: var(--dfnpanel-target-bg);
outline: 5px solid var(--dfnpanel-target-outline);
}
to {
color: var(--a-normal-text);
background-color: transparent;
outline: transparent;
}
}
</style>
<style>/* Boilerplate: style-idl-highlighting */
pre.idl.highlight {
background: var(--borderedblock-bg, var(--def-bg));
}
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<style>/* Boilerplate: style-issues */
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<h1 class="p-name no-ref" id="title">WebRTC RTP Transport</h1>
<p id="w3c-state"><a href="https://www.w3.org/standards/types/#UD">Unofficial Proposal Draft</a>, <time class="dt-updated" datetime="2025-01-13">13 January 2025</time></p>
<details open>
<summary>More details about this document</summary>
<div data-fill-with="spec-metadata">
<dl>
<dt>This version:
<dd><a class="u-url" href="https://github.com/w3c/webrtc-rtptransport">https://github.com/w3c/webrtc-rtptransport</a>
<dt>Latest published version:
<dd><a href="https://www.w3.org/TR/webrtc-rtptransport/">https://www.w3.org/TR/webrtc-rtptransport/</a>
<dt>Feedback:
<dd><span><a href="mailto:public-webrtc@w3.org?subject=%5Bwebrtc-rtptransport%5D%20YOUR%20TOPIC%20HERE">public-webrtc@w3.org</a> with subject line “<kbd>[webrtc-rtptransport] <i data-lt>… message topic …</i></kbd>” (<a href="https://lists.w3.org/Archives/Public/public-webrtc/" rel="discussion">archives</a>)</span>
<dd><a href="https://github.com/w3c/webrtc-rtptransport/issues/">GitHub</a>
<dt class="editor">Editors:
<dd class="editor p-author h-card vcard" data-editor-id="68236"><a class="p-name fn u-email email" href="mailto:pthatcher@microsoft.com">Peter Thatcher</a> (<a class="p-org org" href="https://www.microsoft.com">Microsoft Corporation</a>)
<dd class="editor p-author h-card vcard"><a class="p-name fn u-email email" href="mailto:herre@google.com">Tony Herre</a> (<a class="p-org org" href="https://www.google.com">Google</a>)
<dd class="editor p-author h-card vcard" data-editor-id="65611"><a class="p-name fn u-email email" href="mailto:bernarda@microsoft.com">Bernard Aboba</a> (<a class="p-org org" href="https://www.microsoft.com">Microsoft Corporation</a>)
<dt>Participate:
<dd><a href="https://github.com/w3c/webrtc-rtptransport">Git Repository.</a>
<dd><a href="https://github.com/w3c/webrtc-rtptransport/issues/new">File an issue.</a>
<dt>Version History:
<dd><a href="https://github.com/w3c/webrtc-rtptransport/commits">https://github.com/w3c/webrtc-rtptransport/commits</a>
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<p class="copyright" data-fill-with="copyright"><a href="https://www.w3.org/policies/#copyright">Copyright</a> © 2025 <a href="https://www.w3.org/">World Wide Web Consortium</a>. <abbr title="World Wide Web Consortium">W3C</abbr><sup>®</sup> <a href="https://www.w3.org/policies/#Legal_Disclaimer">liability</a>, <a href="https://www.w3.org/policies/#W3C_Trademarks">trademark</a> and <a href="https://www.w3.org/copyright/software-license/" rel="license" title="W3C Software and Document License">permissive document license</a> rules apply. </p>
<hr title="Separator for header">
</div>
<div class="p-summary" data-fill-with="abstract">
<h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
<p>The WebRTC-RtpTransport API allows web applications to send and receive RTP/RTCP packets
using the protocol defined in <a data-link-type="biblio" href="#biblio-rfc3550" title="RTP: A Transport Protocol for Real-Time Applications">[RFC3550]</a>.</p>
</div>
<h2 class="no-num no-toc no-ref heading settled" id="sotd"><span class="content">Status of this document</span></h2>
<div data-fill-with="status">
<p></p>
</div>
<div data-fill-with="at-risk"></div>
<nav data-fill-with="table-of-contents" id="toc">
<h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
<ol class="toc" role="directory">
<li><a href="#introduction"><span class="secno">1</span> <span class="content">Introduction</span></a>
<li><a href="#conformance"><span class="secno">2</span> <span class="content">Conformance</span></a>
<li><a href="#terminology"><span class="secno">3</span> <span class="content">Terminology</span></a>
<li>
<a href="#rtptransport"><span class="secno">4</span> <span class="content"><span><code>RTCRtpTransport</code></span> Interface</span></a>
<ol class="toc">
<li><a href="#rtptransport-attributes"><span class="secno">4.1</span> <span class="content">Attributes</span></a>
<li><a href="#rtptransport-methods"><span class="secno">4.2</span> <span class="content">Methods</span></a>
</ol>
<li>
<a href="#objects"><span class="secno">5</span> <span class="content">Objects</span></a>
<ol class="toc">
<li><a href="#rtppacket"><span class="secno">5.1</span> <span class="content"><span><code>RTCRtpPacket</code></span> Interface</span></a>
<li><a href="#rtpheaderextension"><span class="secno">5.2</span> <span class="content"><span><code>RTCRtpHeaderExtension</code></span> Interface</span></a>
<li><a href="#rtpheaderextensioninit"><span class="secno">5.3</span> <span class="content"><span><code>RTCRtpHeaderExtensionInit</code></span> Dictionary</span></a>
<li><a href="#rtppacketinit"><span class="secno">5.4</span> <span class="content"><span><code>RTCRtpPacketInit</code></span> Dictionary</span></a>
<li><a href="#rtpacks"><span class="secno">5.5</span> <span class="content"><span><code>RTCRtpAcks</code></span> Interface</span></a>
<li><a href="#rtpack"><span class="secno">5.6</span> <span class="content"><span><code>RTCRtpAck</code></span></span></a>
<li><a href="#explicitcongestionnotification"><span class="secno">5.7</span> <span class="content"><span><code>RTCExplicitCongestionNotification</code></span></span></a>
</ol>
<li>
<a href="#rtpsentstream"><span class="secno">6</span> <span class="content"><span><code>RTCRtpPacketSender</code></span> Interface</span></a>
<ol class="toc">
<li><a href="#rtpsentresult"><span class="secno">6.1</span> <span class="content"><span><code>RTCRtpSendResult</code></span> Interface</span></a>
<li><a href="#rtpsent"><span class="secno">6.2</span> <span class="content"><span><code>RTCRtpSent</code></span> Interface</span></a>
<li><a href="#RTCRtpUnsentReason"><span class="secno">6.3</span> <span class="content"><span><code>RTCRtpUnsentReason</code></span> Enum</span></a>
<li><a href="#rtpsendoptions"><span class="secno">6.4</span> <span class="content"><span><code>RTCRtpSendOptions</code></span> Dictionary</span></a>
</ol>
<li><a href="#rtppacketreceiver"><span class="secno">7</span> <span class="content"><span><code>RTCRtpPacketReceiver</code></span> Interface</span></a>
<li>
<a href="#interface-extensions"><span class="secno">8</span> <span class="content">Interface Extensions</span></a>
<ol class="toc">
<li><a href="#rtcpeerconnection-extensions"><span class="secno">8.1</span> <span class="content">RTCPeerConnection Interface Extensions</span></a>
<li><a href="#rtcrtpsender-extensions"><span class="secno">8.2</span> <span class="content">RTCRtpSender Interface Extensions</span></a>
<li><a href="#rtcconfiguration-extensions"><span class="secno">8.3</span> <span class="content">RTCConfiguration Dictionary Extensions</span></a>
<li><a href="#rtcrtpreceiver-extensions"><span class="secno">8.4</span> <span class="content">RTCRtpReceiver Interface Extensions</span></a>
</ol>
<li>
<a href="#privacy"><span class="secno">9</span> <span class="content">Privacy and security considerations</span></a>
<ol class="toc">
<li><a href="#confidentiality"><span class="secno">9.1</span> <span class="content">Confidentiality of Communications</span></a>
<li><a href="#state-persistence"><span class="secno">9.2</span> <span class="content">State Persistence</span></a>
<li><a href="#protocol-security"><span class="secno">9.3</span> <span class="content">Protocol Security</span></a>
<li><a href="#fingerprinting"><span class="secno">9.4</span> <span class="content">Fingerprinting and Tracking</span></a>
</ol>
<li><a href="#examples"><span class="secno">10</span> <span class="content">Examples</span></a>
<li><a href="#acknowledgements"><span class="secno">11</span> <span class="content">Acknowledgements</span></a>
<li>
<a href="#index"><span class="secno"></span> <span class="content">Index</span></a>
<ol class="toc">
<li><a href="#index-defined-here"><span class="secno"></span> <span class="content">Terms defined by this specification</span></a>
<li><a href="#index-defined-elsewhere"><span class="secno"></span> <span class="content">Terms defined by reference</span></a>
</ol>
<li>
<a href="#references"><span class="secno"></span> <span class="content">References</span></a>
<ol class="toc">
<li><a href="#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
</ol>
<li><a href="#idl-index"><span class="secno"></span> <span class="content">IDL Index</span></a>
</ol>
</nav>
<main>
<h2 class="heading settled" data-level="1" id="introduction"><span class="secno">1. </span><span class="content">Introduction</span><a class="self-link" href="#introduction"></a></h2>
<p><em>This section is non-normative.</em></p>
<p>This specification uses <a data-link-type="biblio" href="#biblio-rfc3550" title="RTP: A Transport Protocol for Real-Time Applications">[RFC3550]</a> to send and receive RTP and RTCP packets.</p>
<p class="note" role="note"><span class="marker">Note:</span> The API presented in this specification represents a preliminary proposal
based on work-in-progress within the W3C WEBRTC WG. As a result, the API is likely
to change significantly going forward.</p>
<h2 class="heading settled" data-level="2" id="conformance"><span class="secno">2. </span><span class="content">Conformance</span><a class="self-link" href="#conformance"></a></h2>
<p>As well as sections marked as non-normative, all authoring guidelines,
diagrams, examples, and notes in this specification are non-normative.
Everything else in this specification is normative.</p>
<p>The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
"SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" are to be interpreted as described in <a data-link-type="biblio" href="#biblio-rfc2119" title="Key words for use in RFCs to Indicate Requirement Levels">[RFC2119]</a> and <a data-link-type="biblio" href="#biblio-rfc8174" title="Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words">[RFC8174]</a> when, and only when, they appear in all capitals, as shown here.</p>
<p>This specification defines conformance criteria that apply to a single product:
the user agent that implements the interfaces that it contains.</p>
<p>Conformance requirements phrased as algorithms or specific steps may be
implemented in any manner, so long as the end result is equivalent. (In
particular, the algorithms defined in this specification are intended to be
easy to follow, and not intended to be performant.)</p>
<p>Implementations that use ECMAScript to implement the APIs defined in this
specification MUST implement them in a manner consistent with the ECMAScript
Bindings defined in the Web IDL specification <a data-link-type="biblio" href="#biblio-webidl" title="Web IDL Standard">[WEBIDL]</a>, as this
specification uses that specification and terminology.</p>
<h2 class="heading settled" data-level="3" id="terminology"><span class="secno">3. </span><span class="content">Terminology</span><a class="self-link" href="#terminology"></a></h2>
<p>Terminology definitions go here.</p>
<h2 class="heading settled" data-level="4" id="rtptransport"><span class="secno">4. </span><span class="content"><dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="rtcrtptransport"><code>RTCRtpTransport</code></dfn> Interface</span><a class="self-link" href="#rtptransport"></a></h2>
<pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed"><c- g>Exposed</c-></a>=(<c- n>Window</c->)]
<c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#rtcrtptransport" id="ref-for-rtcrtptransport"><c- g>RTCRtpTransport</c-></a> {
<c- b>attribute</c-> <a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/webappapis.html#eventhandler" id="ref-for-eventhandler"><c- n>EventHandler</c-></a> <a class="idl-code" data-link-type="attribute" data-type="EventHandler" href="#dom-rtcrtptransport-onpacketizedrtpavailable" id="ref-for-dom-rtcrtptransport-onpacketizedrtpavailable"><c- g>onpacketizedrtpavailable</c-></a>;
<a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence"><c- b>sequence</c-></a><<a data-link-type="idl-name" href="#rtcrtppacket" id="ref-for-rtcrtppacket"><c- n>RTCRtpPacket</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-rtcrtptransport-readpacketizedrtp" id="ref-for-dom-rtcrtptransport-readpacketizedrtp"><c- g>readPacketizedRtp</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long"><c- b>unsigned</c-> <c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport/readPacketizedRtp(maxNumberOfPackets)" data-dfn-type="argument" data-export id="dom-rtcrtptransport-readpacketizedrtp-maxnumberofpackets-maxnumberofpackets"><code><c- g>maxNumberOfPackets</c-></code></dfn>);
// BYOP: Copies the read packets into dstPackets, returning the number of packets written (up to dstPackets.length).
<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="method" href="#dom-rtcrtptransport-readpacketizedrtp-dstpackets" id="ref-for-dom-rtcrtptransport-readpacketizedrtp-dstpackets"><c- g>readPacketizedRtp</c-></a>(<a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence①"><c- b>sequence</c-></a><<a data-link-type="idl-name" href="#rtcrtppacket" id="ref-for-rtcrtppacket①"><c- n>RTCRtpPacket</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport/readPacketizedRtp(dstPackets)" data-dfn-type="argument" data-export id="dom-rtcrtptransport-readpacketizedrtp-dstpackets-dstpackets"><code><c- g>dstPackets</c-></code></dfn>);
<c- b>attribute</c-> <a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/webappapis.html#eventhandler" id="ref-for-eventhandler①"><c- n>EventHandler</c-></a> <a class="idl-code" data-link-type="attribute" data-type="EventHandler" href="#dom-rtcrtptransport-onsentrtp" id="ref-for-dom-rtcrtptransport-onsentrtp"><c- g>onsentrtp</c-></a>;
// Batch interface to read RTCRtpSent notifications.
<a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence②"><c- b>sequence</c-></a><<a data-link-type="idl-name" href="#rtcrtpsent" id="ref-for-rtcrtpsent"><c- n>RTCRtpSent</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-rtcrtptransport-readsentrtp" id="ref-for-dom-rtcrtptransport-readsentrtp"><c- g>readSentRtp</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-long" id="ref-for-idl-long"><c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport/readSentRtp(maxCount)" data-dfn-type="argument" data-export id="dom-rtcrtptransport-readsentrtp-maxcount-maxcount"><code><c- g>maxCount</c-></code></dfn>);
<c- b>attribute</c-> <a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/webappapis.html#eventhandler" id="ref-for-eventhandler②"><c- n>EventHandler</c-></a> <a class="idl-code" data-link-type="attribute" data-type="EventHandler" href="#dom-rtcrtptransport-onreceivedrtpacks" id="ref-for-dom-rtcrtptransport-onreceivedrtpacks"><c- g>onreceivedrtpacks</c-></a>; // No payload. Use readReceivedRtpAcks
// Batch interface to read RTCRtpAcks as an alternative to onrtpacksreceived.
<a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence③"><c- b>sequence</c-></a><<a data-link-type="idl-name" href="#rtcrtpacks" id="ref-for-rtcrtpacks"><c- n>RTCRtpAcks</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-rtcrtptransport-readreceivedrtpacks" id="ref-for-dom-rtcrtptransport-readreceivedrtpacks"><c- g>readReceivedRtpAcks</c-></a>(<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-long" id="ref-for-idl-long①"><c- b>long</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport/readReceivedRtpAcks(maxCount)" data-dfn-type="argument" data-export id="dom-rtcrtptransport-readreceivedrtpacks-maxcount-maxcount"><code><c- g>maxCount</c-></code></dfn>);
<c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long②"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-rtcrtptransport-bandwidthestimate" id="ref-for-dom-rtcrtptransport-bandwidthestimate"><c- g>bandwidthEstimate</c-></a>; // bps
<c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long③"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-rtcrtptransport-allocatedbandwidth" id="ref-for-dom-rtcrtptransport-allocatedbandwidth"><c- g>allocatedBandwidth</c-></a>; // bps
<c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long④"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-type="unsigned long" href="#dom-rtcrtptransport-customallocatedbandwidth" id="ref-for-dom-rtcrtptransport-customallocatedbandwidth"><c- g>customAllocatedBandwidth</c-></a>; // writable
// Means "when doing bitrate allocation and rate control, don’t use more than this"
<c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑤"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-type="unsigned long" href="#dom-rtcrtptransport-custommaxbandwidth" id="ref-for-dom-rtcrtptransport-custommaxbandwidth"><c- g>customMaxBandwidth</c-></a>;
// Means "make each packet smaller by this much so I can put custom stuff in each packet"
<c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑥"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-type="unsigned long" href="#dom-rtcrtptransport-customperpacketoverhead" id="ref-for-dom-rtcrtptransport-customperpacketoverhead"><c- g>customPerPacketOverhead</c-></a>;
};
</pre>
<h3 class="heading settled" data-level="4.1" id="rtptransport-attributes"><span class="secno">4.1. </span><span class="content">Attributes</span><a class="self-link" href="#rtptransport-attributes"></a></h3>
<dl>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport" data-dfn-type="attribute" data-export id="dom-rtcrtptransport-onpacketizedrtpavailable"><code>onpacketizedrtpavailable</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/webappapis.html#eventhandler" id="ref-for-eventhandler③">EventHandler</a></span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport" data-dfn-type="attribute" data-export id="dom-rtcrtptransport-onsentrtp"><code>onsentrtp</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/webappapis.html#eventhandler" id="ref-for-eventhandler④">EventHandler</a></span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport" data-dfn-type="attribute" data-export id="dom-rtcrtptransport-onreceivedrtpacks"><code>onreceivedrtpacks</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://html.spec.whatwg.org/multipage/webappapis.html#eventhandler" id="ref-for-eventhandler⑤">EventHandler</a></span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport" data-dfn-type="attribute" data-export id="dom-rtcrtptransport-bandwidthestimate"><code>bandwidthEstimate</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑦">unsigned long</a>, readonly</span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport" data-dfn-type="attribute" data-export id="dom-rtcrtptransport-allocatedbandwidth"><code>allocatedBandwidth</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑧">unsigned long</a>, readonly</span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport" data-dfn-type="attribute" data-export id="dom-rtcrtptransport-customallocatedbandwidth"><code>customAllocatedBandwidth</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long⑨">unsigned long</a></span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport" data-dfn-type="attribute" data-export id="dom-rtcrtptransport-custommaxbandwidth"><code>customMaxBandwidth</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①⓪">unsigned long</a></span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport" data-dfn-type="attribute" data-export id="dom-rtcrtptransport-customperpacketoverhead"><code>customPerPacketOverhead</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①①">unsigned long</a></span>
<dd>
</dl>
<h3 class="heading settled" data-level="4.2" id="rtptransport-methods"><span class="secno">4.2. </span><span class="content">Methods</span><a class="self-link" href="#rtptransport-methods"></a></h3>
<dl>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport" data-dfn-type="method" data-export data-lt="readPacketizedRtp(maxNumberOfPackets)" id="dom-rtcrtptransport-readpacketizedrtp"><code>readPacketizedRtp(unsigned long maxNumberOfPackets)</code></dfn>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport" data-dfn-type="method" data-export data-lt="readPacketizedRtp(dstPackets)" id="dom-rtcrtptransport-readpacketizedrtp-dstpackets"><code>readPacketizedRtp(sequence<RTCRtpPacket> dstPackets)</code></dfn>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport" data-dfn-type="method" data-export data-lt="readSentRtp(maxCount)" id="dom-rtcrtptransport-readsentrtp"><code>readSentRtp(long maxCount)</code></dfn>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpTransport" data-dfn-type="method" data-export data-lt="readReceivedRtpAcks(maxCount)" id="dom-rtcrtptransport-readreceivedrtpacks"><code>readReceivedRtpAcks(long maxCount)</code></dfn>
<dd>
</dl>
<h2 class="heading settled" data-level="5" id="objects"><span class="secno">5. </span><span class="content">Objects</span><a class="self-link" href="#objects"></a></h2>
<h3 class="heading settled" data-level="5.1" id="rtppacket"><span class="secno">5.1. </span><span class="content"><dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="rtcrtppacket"><code>RTCRtpPacket</code></dfn> Interface</span><a class="self-link" href="#rtppacket"></a></h3>
<pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed①"><c- g>Exposed</c-></a>=(<c- n>Window</c->)]
<c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#rtcrtppacket" id="ref-for-rtcrtppacket②"><c- g>RTCRtpPacket</c-></a> {
<dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="constructor" data-export data-lt="RTCRtpPacket(init)|constructor(init)" id="dom-rtcrtppacket-rtcrtppacket"><code><c- g>constructor</c-></code></dfn>(<a data-link-type="idl-name" href="#dictdef-rtcrtppacketinit" id="ref-for-dictdef-rtcrtppacketinit"><c- n>RTCRtpPacketInit</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket/RTCRtpPacket(init), RTCRtpPacket/constructor(init)" data-dfn-type="argument" data-export id="dom-rtcrtppacket-rtcrtppacket-init-init"><code><c- g>init</c-></code></dfn>);
// BYOP: Construct a packet that can be used as destination for writing read packets.
<dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="constructor" data-export data-lt="RTCRtpPacket()|constructor()" id="dom-rtcrtppacket-rtcrtppacket①"><code><c- g>constructor</c-></code></dfn>();
<c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="attribute" data-type="boolean" href="#dom-rtcrtppacket-marker" id="ref-for-dom-rtcrtppacket-marker"><c- g>marker</c-></a>;
<c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-octet" id="ref-for-idl-octet"><c- b>octet</c-></a> <a class="idl-code" data-link-type="attribute" data-type="octet" href="#dom-rtcrtppacket-payloadtype" id="ref-for-dom-rtcrtppacket-payloadtype"><c- g>payloadType</c-></a>;
<c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-short" id="ref-for-idl-unsigned-short"><c- b>unsigned</c-> <c- b>short</c-></a> <a class="idl-code" data-link-type="attribute" data-type="unsigned short" href="#dom-rtcrtppacket-sequencenumber" id="ref-for-dom-rtcrtppacket-sequencenumber"><c- g>sequenceNumber</c-></a>;
<c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①②"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-type="unsigned long" href="#dom-rtcrtppacket-timestamp" id="ref-for-dom-rtcrtppacket-timestamp"><c- g>timestamp</c-></a>;
<c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①③"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-type="unsigned long" href="#dom-rtcrtppacket-ssrc" id="ref-for-dom-rtcrtppacket-ssrc"><c- g>ssrc</c-></a>;
<a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence④"><c- b>sequence</c-></a><<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①④"><c- b>unsigned</c-> <c- b>long</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-rtcrtppacket-getcsrcs" id="ref-for-dom-rtcrtppacket-getcsrcs"><c- g>getCsrcs</c-></a>();
<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-rtcrtppacket-setcsrcs" id="ref-for-dom-rtcrtppacket-setcsrcs"><c- g>setCsrcs</c-></a>(<a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑤"><c- b>sequence</c-></a><<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①⑤"><c- b>unsigned</c-> <c- b>long</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket/setCsrcs(csrcs)" data-dfn-type="argument" data-export id="dom-rtcrtppacket-setcsrcs-csrcs-csrcs"><code><c- g>csrcs</c-></code></dfn>);
<a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑥"><c- b>sequence</c-></a><<a data-link-type="idl-name" href="#rtcrtpheaderextension" id="ref-for-rtcrtpheaderextension"><c- n>RTCRtpHeaderExtension</c-></a>> <a class="idl-code" data-link-type="method" href="#dom-rtcrtppacket-getheaderextensions" id="ref-for-dom-rtcrtppacket-getheaderextensions"><c- g>getHeaderExtensions</c-></a>();
<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined①"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-rtcrtppacket-setheaderextensions" id="ref-for-dom-rtcrtppacket-setheaderextensions"><c- g>setHeaderExtensions</c-></a>(<a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑦"><c- b>sequence</c-></a><<a data-link-type="idl-name" href="#rtcrtpheaderextension" id="ref-for-rtcrtpheaderextension①"><c- n>RTCRtpHeaderExtension</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket/setHeaderExtensions(headerExtensions)" data-dfn-type="argument" data-export id="dom-rtcrtppacket-setheaderextensions-headerextensions-headerextensions"><code><c- g>headerExtensions</c-></code></dfn>);
<c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①⑥"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-type="unsigned long" href="#dom-rtcrtppacket-paddingbytes" id="ref-for-dom-rtcrtppacket-paddingbytes"><c- g>paddingBytes</c-></a>;
<c- b>attribute</c-> <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#AllowSharedBufferSource" id="ref-for-AllowSharedBufferSource"><c- n>AllowSharedBufferSource</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="attribute" data-export data-type="AllowSharedBufferSource" id="dom-rtcrtppacket-payload"><code><c- g>payload</c-></code></dfn>;
// OPTIONAL: Extra information that may be useful to know
<c- b>attribute</c-> <a data-link-type="idl-name" href="https://w3c.github.io/hr-time/#dom-domhighrestimestamp" id="ref-for-dom-domhighrestimestamp"><c- n>DOMHighResTimeStamp</c-></a>? <a class="idl-code" data-link-type="attribute" data-type="DOMHighResTimeStamp?" href="#dom-rtcrtppacket-receivedtime" id="ref-for-dom-rtcrtppacket-receivedtime"><c- g>receivedTime</c-></a>;
<c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①⑦"><c- b>unsigned</c-> <c- b>long</c-></a>? <a class="idl-code" data-link-type="attribute" data-type="unsigned long?" href="#dom-rtcrtppacket-sequencenumberrollovercount" id="ref-for-dom-rtcrtppacket-sequencenumberrollovercount"><c- g>sequenceNumberRolloverCount</c-></a>;
};
</pre>
<dl>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="attribute" data-export id="dom-rtcrtppacket-marker"><code>marker</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean①">boolean</a></span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="attribute" data-export id="dom-rtcrtppacket-payloadtype"><code>payloadType</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-octet" id="ref-for-idl-octet①">octet</a></span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="attribute" data-export id="dom-rtcrtppacket-sequencenumber"><code>sequenceNumber</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-short" id="ref-for-idl-unsigned-short①">unsigned short</a></span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="attribute" data-export id="dom-rtcrtppacket-timestamp"><code>timestamp</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①⑧">unsigned long</a></span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="attribute" data-export id="dom-rtcrtppacket-ssrc"><code>ssrc</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long①⑨">unsigned long</a></span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="attribute" data-export id="dom-rtcrtppacket-paddingbytes"><code>paddingBytes</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long②⓪">unsigned long</a></span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="attribute" data-export id="dom-rtcrtppacket-receivedtime"><code>receivedTime</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://w3c.github.io/hr-time/#dom-domhighrestimestamp" id="ref-for-dom-domhighrestimestamp①">DOMHighResTimeStamp</a>, nullable</span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="attribute" data-export id="dom-rtcrtppacket-sequencenumberrollovercount"><code>sequenceNumberRolloverCount</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long②①">unsigned long</a>, nullable</span>
<dd>
</dl>
<dl>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="method" data-export id="dom-rtcrtppacket-getcsrcs"><code>getCsrcs()</code></dfn>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="method" data-export data-lt="setCsrcs(csrcs)" id="dom-rtcrtppacket-setcsrcs"><code>setCsrcs(sequence<unsigned long> csrcs)</code></dfn>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="method" data-export id="dom-rtcrtppacket-getheaderextensions"><code>getHeaderExtensions()</code></dfn>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpPacket" data-dfn-type="method" data-export data-lt="setHeaderExtensions(headerExtensions)" id="dom-rtcrtppacket-setheaderextensions"><code>setHeaderExtensions(sequence<RTCRtpHeaderExtension> headerExtensions)</code></dfn>
<dd>
</dl>
<h3 class="heading settled" data-level="5.2" id="rtpheaderextension"><span class="secno">5.2. </span><span class="content"><dfn class="dfn-paneled idl-code" data-dfn-type="interface" data-export id="rtcrtpheaderextension"><code>RTCRtpHeaderExtension</code></dfn> Interface</span><a class="self-link" href="#rtpheaderextension"></a></h3>
<pre class="idl highlight def">[<a class="idl-code" data-link-type="extended-attribute" href="https://webidl.spec.whatwg.org/#Exposed" id="ref-for-Exposed②"><c- g>Exposed</c-></a>=(<c- n>Window</c->)]
<c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="#rtcrtpheaderextension" id="ref-for-rtcrtpheaderextension②"><c- g>RTCRtpHeaderExtension</c-></a> {
<dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpHeaderExtension" data-dfn-type="constructor" data-export data-lt="RTCRtpHeaderExtension(init)|constructor(init)" id="dom-rtcrtpheaderextension-rtcrtpheaderextension"><code><c- g>constructor</c-></code></dfn>(<a data-link-type="idl-name" href="#dictdef-rtcrtpheaderextensioninit" id="ref-for-dictdef-rtcrtpheaderextensioninit"><c- n>RTCRtpHeaderExtensionInit</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpHeaderExtension/RTCRtpHeaderExtension(init), RTCRtpHeaderExtension/constructor(init)" data-dfn-type="argument" data-export id="dom-rtcrtpheaderextension-rtcrtpheaderextension-init-init"><code><c- g>init</c-></code></dfn>);
<c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString"><c- b>DOMString</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="DOMString" href="#dom-rtcrtpheaderextension-uri" id="ref-for-dom-rtcrtpheaderextension-uri"><c- g>uri</c-></a>;
<c- b>readonly</c-> <c- b>attribute</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long②②"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="attribute" data-readonly data-type="unsigned long" href="#dom-rtcrtpheaderextension-valuebytelength" id="ref-for-dom-rtcrtpheaderextension-valuebytelength"><c- g>valueByteLength</c-></a>;
// Write the extension’s value to the specified (Shared-)ArrayBuffer/ArrayBufferView,
// allowing for BYOB. Throws a TypeError if |destination| is smaller than
// |valueByteLength|.
<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-undefined" id="ref-for-idl-undefined②"><c- b>undefined</c-></a> <a class="idl-code" data-link-type="method" href="#dom-rtcrtpheaderextension-copyvalueto" id="ref-for-dom-rtcrtpheaderextension-copyvalueto"><c- g>copyValueTo</c-></a>(<a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#AllowSharedBufferSource" id="ref-for-AllowSharedBufferSource①"><c- n>AllowSharedBufferSource</c-></a> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpHeaderExtension/copyValueTo(destination)" data-dfn-type="argument" data-export id="dom-rtcrtpheaderextension-copyvalueto-destination-destination"><code><c- g>destination</c-></code></dfn>);
};
</pre>
<dl>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpHeaderExtension" data-dfn-type="attribute" data-export id="dom-rtcrtpheaderextension-uri"><code>uri</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString①">DOMString</a>, readonly</span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpHeaderExtension" data-dfn-type="attribute" data-export id="dom-rtcrtpheaderextension-valuebytelength"><code>valueByteLength</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long②③">unsigned long</a>, readonly</span>
<dd>
</dl>
<dl>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpHeaderExtension" data-dfn-type="method" data-export data-lt="copyValueTo(destination)" id="dom-rtcrtpheaderextension-copyvalueto"><code>copyValueTo(AllowSharedBufferSource destination)</code></dfn>
<dd>
</dl>
<h3 class="heading settled" data-level="5.3" id="rtpheaderextensioninit"><span class="secno">5.3. </span><span class="content"><dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-rtcrtpheaderextensioninit"><code>RTCRtpHeaderExtensionInit</code></dfn> Dictionary</span><a class="self-link" href="#rtpheaderextensioninit"></a></h3>
<pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-rtcrtpheaderextensioninit" id="ref-for-dictdef-rtcrtpheaderextensioninit①"><c- g>RTCRtpHeaderExtensionInit</c-></a> {
<c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString②"><c- b>DOMString</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="DOMString" href="#dom-rtcrtpheaderextensioninit-uri" id="ref-for-dom-rtcrtpheaderextensioninit-uri"><c- g>uri</c-></a>;
<c- b>required</c-> <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#AllowSharedBufferSource" id="ref-for-AllowSharedBufferSource②"><c- n>AllowSharedBufferSource</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="AllowSharedBufferSource" href="#dom-rtcrtpheaderextensioninit-value" id="ref-for-dom-rtcrtpheaderextensioninit-value"><c- g>value</c-></a>;
};
</pre>
<dl>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpHeaderExtensionInit" data-dfn-type="dict-member" data-export id="dom-rtcrtpheaderextensioninit-uri"><code>uri</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-DOMString" id="ref-for-idl-DOMString③">DOMString</a></span>
<dd>
<dt> <dfn class="dfn-paneled idl-code" data-dfn-for="RTCRtpHeaderExtensionInit" data-dfn-type="dict-member" data-export id="dom-rtcrtpheaderextensioninit-value"><code>value</code></dfn>, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#AllowSharedBufferSource" id="ref-for-AllowSharedBufferSource③">AllowSharedBufferSource</a></span>
<dd>
</dl>
<h3 class="heading settled" data-level="5.4" id="rtppacketinit"><span class="secno">5.4. </span><span class="content"><dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-rtcrtppacketinit"><code>RTCRtpPacketInit</code></dfn> Dictionary</span><a class="self-link" href="#rtppacketinit"></a></h3>
<pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-rtcrtppacketinit" id="ref-for-dictdef-rtcrtppacketinit①"><c- g>RTCRtpPacketInit</c-></a> {
<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean②"><c- b>boolean</c-></a> <a class="idl-code" data-default="false" data-link-type="dict-member" data-type="boolean" href="#dom-rtcrtppacketinit-marker" id="ref-for-dom-rtcrtppacketinit-marker"><c- g>marker</c-></a> = <c- b>false</c->;
<c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-octet" id="ref-for-idl-octet②"><c- b>octet</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="octet" href="#dom-rtcrtppacketinit-payloadtype" id="ref-for-dom-rtcrtppacketinit-payloadtype"><c- g>payloadType</c-></a>;
<c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long②④"><c- b>unsigned</c-> <c- b>long</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="unsigned long" href="#dom-rtcrtppacketinit-timestamp" id="ref-for-dom-rtcrtppacketinit-timestamp"><c- g>timestamp</c-></a>;
<a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑧"><c- b>sequence</c-></a><<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-unsigned-long" id="ref-for-idl-unsigned-long②⑤"><c- b>unsigned</c-> <c- b>long</c-></a>> <a class="idl-code" data-default="[]" data-link-type="dict-member" data-type="sequence<unsigned long>" href="#dom-rtcrtppacketinit-csrcs" id="ref-for-dom-rtcrtppacketinit-csrcs"><c- g>csrcs</c-></a> = [];
// Cannot be MID, RID, or congestion control sequence number
<a data-link-type="dfn" href="https://webidl.spec.whatwg.org/#idl-sequence" id="ref-for-idl-sequence⑨"><c- b>sequence</c-></a><<a data-link-type="idl-name" href="#dictdef-rtcrtpheaderextensioninit" id="ref-for-dictdef-rtcrtpheaderextensioninit②"><c- n>RTCRtpHeaderExtensionInit</c-></a>> <a class="idl-code" data-default="[]" data-link-type="dict-member" data-type="sequence<RTCRtpHeaderExtensionInit>" href="#dom-rtcrtppacketinit-headerextensions" id="ref-for-dom-rtcrtppacketinit-headerextensions"><c- g>headerExtensions</c-></a> = [];