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Separate Send/ReceiveCodecs and NegotiatedCodecs #2972

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Separate Send/ReceiveCodecs and NegotiatedCodecs #2972

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70aa381
Separate Send/ReceiveCodecs and NegotiatedCodecs
alvestrand May 8, 2024
50bc218
Fix markup.
alvestrand May 8, 2024
be077ac
Fix html bug
alvestrand May 13, 2024
2da8426
Improve error communicate in amemendment checker
dontcallmedom May 13, 2024
805ca44
Improve error communicate in amemendment checker
dontcallmedom May 13, 2024
8991050
Attempt at amendments.json
alvestrand May 21, 2024
10bc207
Fix syntax error
alvestrand May 22, 2024
62f77eb
Reference test
alvestrand Jun 20, 2024
8dacfdc
Fix JSON in amendments.json
dontcallmedom Jun 21, 2024
ea35721
Simplify data in amendments
dontcallmedom Jun 21, 2024
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66 changes: 39 additions & 27 deletions webrtc.html
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Original file line number Diff line number Diff line change
Expand Up @@ -1864,9 +1864,9 @@ <h4>
<li>
<p>
Set
<var>transceiver</var>.{{RTCRtpTransceiver/[[Receiver]]}}.{{RTCRtpReceiver/[[LastStableStateReceiveCodecs]]}}
<var>transceiver</var>.{{RTCRtpTransceiver/[[Receiver]]}}.{{RTCRtpReceiver/[[LastStableStateNegotiatedCodecs]]}}
to
<var>transceiver</var>.{{RTCRtpTransceiver/[[Receiver]]}}.{{RTCRtpReceiver/[[ReceiveCodecs]]}}.
<var>transceiver</var>.{{RTCRtpTransceiver/[[Receiver]]}}.{{RTCRtpReceiver/[[NegotiatedCodecs]]}}.
</p>
</li>
</ol>
Expand Down Expand Up @@ -2187,24 +2187,6 @@ <h4>
<code>false</code>.
</p>
</li>
<li>
<p>
For each of the codecs that <var>description</var> negotiates for receiving, execute the following steps:
<ol>
<li>Locate the matching codec description in <var>transceiver</var>.{{RTCRtpTransceiver/[[Receiver]]}}.{{RTCRtpReceiver/[[ReceiveCodecs]]}}.</li>
<li>If the matching codec description is not found, abort these steps.</li>
<li>Set the "enabled" flag in the matching codec description to "true".</li>
</ol>

</p>
<p class='note'>
If the <var>direction</var> is
{{RTCRtpTransceiverDirection/"sendonly"}} or
{{RTCRtpTransceiverDirection/"inactive"}},
the receiver is not prepared to receive
anything, and the list will be empty.
</p>
</li>
<li>
<p>
If <var>description</var> is of type
Expand Down Expand Up @@ -2244,13 +2226,37 @@ <h4>
</li>
<li>
<p>
For each of the codecs that <var>description</var> negotiates for sending, execute the following steps:
Clear the <var>transceiver</var>.{{RTCRtpTransceiver/[[Sender]]}}.{{RTCRtpSender/[[NegotiatedCodecs]]}} slot.
<br>
Then, for each of the codecs that <var>description</var> negotiates for sending, execute the following steps:
<ol>
<li>Locate the matching codec description in <var>transceiver</var>.{{RTCRtpTransceiver/[[Sender]]}}.{{RTCRtpSender/[[SendCodecs]]}}.</li>
<li>If the matching codec description is not found, abort these steps.</li>
Comment on lines +2231 to 2234
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@jan-ivar jan-ivar Sep 4, 2024 •
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Which steps are aborted here? One of the nested for-loops or sLD/sRD without error? Either seems wrong.

Not failing assumes negotiated codecs is a subset of this client's [[SendCodecs]]. The 1.0 spec didn't have this. It said:

image image

...which, AFAIK meant sender.getParameters().codecs might include remote codecs not found locally, but found in the remote answer, which JSEP seems to allow: "Any currently available media formats that are not present in the current remote description MUST be added after all existing formats."

Why is this new limitation needed?

It's also unclear what constitutes a "matching codec description".

<li>Set the "enabled" flag in the matching codec description to "true".</li>
<li>Add the codec description to the sender's {{RTCRtpSender/[[NegotiatedCodecs]]}} internal slot.</li>
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</ol>
</li>
<li>
<p>
Clear the <var>transceiver</var>.{{RTCRtpTransceiver/[[Receiver]]}}.{{RTCRtpReceiver/[[NegotiatedCodecs]]}} slot.
<br>
Then, for each of the codecs that <var>description</var> negotiates for receiving, execute the following steps:
<ol>
<li>Locate the matching codec description in <var>transceiver</var>.{{RTCRtpTransceiver/[[Receiver]]}}.{{RTCRtpReceiver/[[ReceiveCodecs]]}}.</li>
<li>If the matching codec description is not found, abort these steps.</li>
<li>Set the "enabled" flag in the matching codec description to "true".</li>
<li>Add the codec description to the receiver's {{RTCRtpReceiver/[[NegotiatedCodecs]]}} internal slot.</li>
</ol>

</p>
<p class='note'>
If the <var>direction</var> is
{{RTCRtpTransceiverDirection/"sendonly"}} or
{{RTCRtpTransceiverDirection/"inactive"}},
the receiver is not prepared to receive
anything, and the list will be empty.
</p>
</li>
<li>
Set <var>transceiver</var>.{{RTCRtpTransceiver/[[Sender]]}}.{{RTCRtpSender/[[LastReturnedParameters]]}}
to <code>null</code>.
Expand Down Expand Up @@ -2693,9 +2699,9 @@ <h4>
<li>
<p>
Set
<var>transceiver</var>.{{RTCRtpTransceiver/[[Receiver]]}}.{{RTCRtpReceiver/[[ReceiveCodecs]]}}
<var>transceiver</var>.{{RTCRtpTransceiver/[[Receiver]]}}.{{RTCRtpReceiver/[[NegotiatedCodecs]]}}
to
<var>transceiver</var>.{{RTCRtpTransceiver/[[Receiver]]}}.{{RTCRtpReceiver/[[LastStableStateReceiveCodecs]]}}.
<var>transceiver</var>.{{RTCRtpTransceiver/[[Receiver]]}}.{{RTCRtpReceiver/[[LastStableStateNegotiatedCodecs]]}}.
</p>
</li>
<li>
Expand Down Expand Up @@ -8800,6 +8806,10 @@ <h3>
[=RTCRtpSender/list of implemented send codecs=], with the "enabled" flag
set in an implementation defined manner.
</p>
</li>
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<p>
Let <var>sender</var> have a <dfn data-dfn-for="RTCRtpSender">[[\NegotiatedCodecs]]</dfn> internal slot, consisting of {{RTCRtpCodecParameters}}, and initialized to an empty list.
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</p>
</li>
<li class="no-test-needed">
<p>
Expand Down Expand Up @@ -9188,8 +9198,7 @@ <h2>
<li data-tests=
"RTCRtpParameters-codecs.html,protocol/video-codecs.https.html">
{{RTCRtpParameters/codecs}} is set to the codecs from the
{{RTCRtpSender/[[SendCodecs]]}} internal slot where the
"enabled" flag is true.
{{RTCRtpSender/[[NegotiatedCodecs]]}} internal slot.
</li>
<li data-tests="RTCRtpParameters-encodings.html">
{{RTCRtpParameters/rtcp}}.{{RTCRtcpParameters/cname}} is
Expand Down Expand Up @@ -10225,11 +10234,14 @@ <h3>
<a>list of implemented receive codecs</a> for <var>kind</var>, and with the "enabled" flag
set in an implementation defined manner.
</p>
<p>
Let <var>receiver</var> have a <dfn data-dfn-for="RTCRtpReceiver">[[\NegotiatedCodecs]]</dfn> internal slot, consisting of {{RTCRtpCodecParameters}}, and initialized to an empty list.
</p>
</li>
<li id="rtcrtpreceiver-laststablestatereceivecodecs">
<p>
Let <var>receiver</var> have a
<dfn data-dfn-for="RTCRtpReceiver">[[\LastStableStateReceiveCodecs]]</dfn> internal slot and
<dfn data-dfn-for="RTCRtpReceiver">[[\LastStableStateNegotiatedCodecs]]</dfn> internal slot and
initialize it to an empty list.
</p>
</li>
Expand Down Expand Up @@ -10507,7 +10519,7 @@ <h2>
<p>
{{RTCRtpParameters/codecs}} is set to the value of the
"enabled" codecs from the
{{RTCRtpReceiver/[[ReceiveCodecs]]}} internal slot.
{{RTCRtpReceiver/[[NegotiatedCodecs]]}} internal slot.
</p>
<div class="note">
Both the local and remote description may affect this
Expand Down
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