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Merge pull request #235 from jan-ivar/abscapture
Reference Absolute Capture Timestamp RTP header extension draft
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index.html

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@@ -54,7 +54,8 @@ <h2>Introduction</h2>
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<h2>Terminology</h2>
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<p>
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The following terms are defined in
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<dfn data-cite="RTP-EXT-CAPTURE-TIME#">RTP Header Extension for Absolute Capture Time</dfn>:
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<dfn>Absolute Capture Timestamp RTP header extension</dfn>
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[[RTP-EXT-CAPTURE-TIME]]:
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</p>
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<ul>
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<li><dfn data-cite="RTP-EXT-CAPTURE-TIME#absolute-capture-timestamp">absolute capture timestamp</dfn></li>
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measurements only accounting for the "last hop", one-way delay from the
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[=capture system=]'s time of capture to the [=receiver system=]'s
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time of playout can be estimated if the
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[=RTP Header Extension for Absolute Capture Time=] is used all hops of
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[=Absolute Capture Timestamp RTP header extension=] is used all hops of
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the way, where each RTCP-terminating intermediate system appropriately
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updates the [=estimated capture clock offset=].
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</p>
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<ol>
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<li>
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<p>If the relevant RTP packet contains the
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<a>RTP Header Extension for Absolute Capture Time</a>, return the
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<a>Absolute Capture Timestamp RTP header extension</a>, return the
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value of the <a>absolute capture timestamp</a> field and abort
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these steps.</p>
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</li>
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<li>
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<p>Otherwise, if the relevant RTP packet does not contain the
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<a>RTP Header Extension for Absolute Capture Time</a> but a
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<a>Absolute Capture Timestamp RTP header extension</a> but a
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previous RTP packet did, return the result of calculating the
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absolute capture timestamp according to
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<a>timestamp interpolation</a> and abort these steps.</p>
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<ol>
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<li>
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<p>If the relevant RTP packet contains the
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<a>RTP Header Extension for Absolute Capture Time</a> and the
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<a>Absolute Capture Timestamp RTP header extension</a> and the
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<a>estimated capture clock offset</a> field is present, return the
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value of the <a>estimated capture clock offset</a> field and abort
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these steps.</p>
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</li>
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<li>
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<p>Otherwise, if the relevant RTP packet does not contain the
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<a>RTP Header Extension for Absolute Capture Time</a>'s
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<a>Absolute Capture Timestamp RTP header extension</a>'s
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<a>estimated capture clock offset</a> field, but a
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previous RTP packet did, return the most recent value that was
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present and abort these steps.</p>
@@ -1542,7 +1543,7 @@ <h4>Remote capture timestamp</h4>
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as specified in [[?RFC3550]] Section 6.4.1, or by other alternative means if use by RTCP SR
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isn't feasible.
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The capture time of an incoming frame is available if its constituent RTP packets contain the
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[=RTP Header Extension for Absolute Capture Time=].
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[=Absolute Capture Timestamp RTP header extension=].
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</p>
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<p>
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Each frame's [=capture timestamp=] MUST be set to the [=remote capture timestamp=], if the information

webrtc-extensions.js

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@@ -41,10 +41,13 @@ var respecConfig = {
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"aliasOf": "RFC9335"
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},
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"RTP-EXT-CAPTURE-TIME": {
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"title": "RTP Header Extension for Absolute Capture Time",
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"publisher": "WebRTC Project",
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href: "https://webrtc.googlesource.com/src/+/refs/heads/main/docs/native-code/rtp-hdrext/abs-capture-time",
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"status": "Experimental RTP Header Extension"
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"title": "Absolute Capture Timestamp RTP header extension",
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"href": "https://www.ietf.org/archive/id/draft-ietf-avtcore-abs-capture-time-00.html",
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"authors": [
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"H. Alvestrand"
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],
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"status": "6 February 2025. Internet Draft (work in progress)",
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"publisher": "IETF"
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}
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}
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}

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