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Define MediaCapabilitiesDecodingInfo.codecSwitchingSupported #165

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Define MediaCapabilitiesDecodingInfo.codecSwitchingSupported #165

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3102bac
Define MediaCapabilitiesDecodingInfo.codecSwitchingSupported
chcunningham Feb 22, 2021
28b8ac6
Minor dfn re-wording
chcunningham Feb 22, 2021
c88c9f8
Xhwang Feedback
chcunningham Feb 23, 2021
1433459
Fixed typos
chrisn Nov 24, 2023
31b912e
Updated references to definitions in MSE spec
chrisn Jan 9, 2024
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,12 @@ spec: media-source; urlPrefix: https://www.w3.org/TR/media-source/
type: method
for: MediaSource; text: isTypeSupported(); url: #dom-mediasource-istypesupported

spec: media-source-codec-switching; urlPrefix: https://rawgit.com/wicg/media-source/codec-switching/index.html
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type: interface
for: SourceBuffer; text: SourceBuffer; url: #sourcebuffer
type: method
for: SourceBuffer; text: changeType(); url: #dom-sourcebuffer-changetype

spec: html; urlPrefix: https://html.spec.whatwg.org/multipage/;
type: method
for: HTMLMediaElement; text: canPlayType(); url: #dom-navigator-canplaytype
Expand Down Expand Up @@ -94,6 +100,8 @@ spec: encrypted-media; for: EME; urlPrefix: https://www.w3.org/TR/encrypted-medi
text: MediaKeysRequirement; url: dom-mediakeysrequirement
text: audioCapabilities; url: dom-mediakeysystemconfiguration-audiocapabilities
text: contentType; url: dom-mediakeysystemmediacapability-contenttype
type: method
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@marcoscaceres marcoscaceres Jan 9, 2024 •
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You shouldn't need this in theory. Or if we do, we need to figure out why it hasn't been exported from the other spec.

text: setMediaKeys(); url: dom-htmlmediaelement-setmediakeys

spec: encrypted-media-draft; for: EME; urlPrefix: https://w3c.github.io/encrypted-media/#
type: attribute
Expand Down Expand Up @@ -180,6 +188,22 @@ spec: secure-contexts; urlPrefix: https://www.w3.org/TR/secure-contexts/
</p>
</section>

<section>
<h2 id='definitions'>Definitions</h2>
<dl>
<dt><dfn>Decoding Pipeline</dfn></dt>
<dd>
A configuration of internal user agent components that implement media
decoding. For the purposes of this specification, we conceive of user
agents having distinct pipelines for encrypted vs unencrypted media.
Additionally, user agents may support several distinct encrypted media
pipelines, which must be signalled by using different
{{MediaCapabilitiesKeySystemConfiguration/keySystem}} names or different
{{KeySystemTrackConfiguration/robustness}} levels.
</dd>
</dl>
</section>

<section>
<h2 id='decoding-encoding-capabilities'>Decoding and Encoding Capabilities</h2>

Expand Down Expand Up @@ -766,6 +790,7 @@ spec: secure-contexts; urlPrefix: https://www.w3.org/TR/secure-contexts/

<pre class='idl'>
dictionary MediaCapabilitiesDecodingInfo : MediaCapabilitiesInfo {
required boolean codecSwitchingSupported;
required MediaKeySystemAccess keySystemAccess;
MediaDecodingConfiguration configuration;
};
Expand Down Expand Up @@ -794,6 +819,21 @@ spec: secure-contexts; urlPrefix: https://www.w3.org/TR/secure-contexts/
temperature or the fans noise.
</p>

<p>
A {{MediaCapabilitiesDecodingInfo}} has an associated
<dfn dict-member for='MediaCapabilitiesDecodingInfo'>
codecSwitchingSupported</dfn> which is a boolean.
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Suggested change
codecSwitchingSupported</dfn> which is a boolean.
codecSwitchingSupported</dfn> that is a boolean.

</p>

<p class='note'>
Authors can use {{MediaCapabilitiesDecodingInfo/codecSwitchingSupported}}
to determine whether the user agent supports codec switching via
{{SourceBuffer/changeType()}} within the described
<a>decoding pipeline</a>. Note that switching between
<a>decoding pipelines</a> is a separate quality of implementation issue
as described by {{EME/setMediaKeys()}}.
</p>

<p>
A {{MediaCapabilitiesDecodingInfo}} has associated
<dfn dict-member for=MediaCapabilitiesDecodingInfo>keySystemAccess</dfn>
Expand Down Expand Up @@ -940,6 +980,23 @@ spec: secure-contexts; urlPrefix: https://www.w3.org/TR/secure-contexts/
efficiency unless the device's power source has side effects
such as enabling different decoding modules.
</li>
<li>
If <code>configuration.type</code> is set to
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can type be linked to something?

{{MediaDecodingType/media-source}}:
<ol>
<li>
Let <var>pipeline</var> be the <a>decoding pipeline</a>
described by <var>configuration</var>.
</li>
<li>
If <var>pipeline</var> is able to support using
{{SourceBuffer}} {{SourceBuffer/changeType()}} to switch
between any and all of its supported codecs, set
{{MediaCapabilitiesDecodingInfo/codecSwitchingSupported}}
to <code>true</code>. Otherwise, set it to <code>false</code>.
</li>
</ol>
</li>
<li>
Return <var>info</var>.
</li>
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