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Merge pull request #155 from fippo/describe-all-the-things
describe (some) fields
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‎index.bs‎

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@@ -267,6 +267,7 @@ The <dfn method for="SFrameTransform">setEncryptionKey(|key|, |keyID|)</dfn> met
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# RTCRtpScriptTransform # {#scriptTransform}
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## <dfn>RTCEncodedVideoFrameType</dfn> dictionary ## {#RTCEncodedVideoFrameType}
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<pre class="idl">
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// New enum for video frame types. Will eventually re-use the equivalent defined
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// by WebCodecs.
@@ -275,7 +276,51 @@ enum RTCEncodedVideoFrameType {
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"key",
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"delta",
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};
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</pre>
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<table data-link-for="RTCEncodedVideoFrameType" data-dfn-for=
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"RTCEncodedVideoFrameType" class="simple">
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<caption>Enumeration description</caption>
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<thead>
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<tr>
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<th>Enum value</th><th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>
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<dfn data-idl="">empty</dfn>
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</td>
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<td>
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<p>
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This frame contains no data.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<dfn data-idl="">key</dfn>
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</td>
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<td>
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<p>
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This frame can be decoded without reference to any other frames.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<dfn data-idl="">delta</dfn>
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</td>
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<td>
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<p>
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This frame references another frame and can not be decoded without that frame.
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</p>
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</td>
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</tr>
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</tbody>
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</table>
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## <dfn>RTCEncodedVideoFrameMetadata</dfn> dictionary ## {#RTCEncodedVideoFrameMetadata}
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<pre class="idl">
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dictionary RTCEncodedVideoFrameMetadata {
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long long frameId;
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sequence&lt;long long&gt; dependencies;
@@ -287,33 +332,194 @@ dictionary RTCEncodedVideoFrameMetadata {
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octet payloadType;
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sequence&lt;unsigned long&gt; contributingSources;
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};
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</pre>
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### Members ### {#RTCEncodedVideoFrameMetadata-members}
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<dl data-link-for="RTCEncodedVideoFrameMetadata"
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data-dfn-for="RTCEncodedVideoFrameMetadata"
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class="dictionary-members">
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<dt>
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<dfn>synchronizationSource</dfn> of type <span class="idlMemberType">unsigned long</span>
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</dt>
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<dd>
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<p>
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The synchronization source (ssrc) identifier is an unsigned integer value per [[RFC3550]]
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used to identify the stream of RTP packets that the encoded frame object is describing.
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</p>
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</dd>
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<dt>
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<dfn>payloadType</dfn> of type <span class="idlMemberType">octet</span>
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</dt>
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<dd>
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<p>
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The payload type is an unsigned integer value in the range from 0 to 127 per [[RFC3550]]
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that is used to describe the format of the RTP payload.
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</p>
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</dd>
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<dt>
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<dfn>contributingSources</dfn> of type <span class=
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"idlMemberType">sequence&lt;unsigned long&gt;</span>
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</dt>
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<dd>
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<p>
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The list of contribution sources (csrc list) as defined in [[RFC3550]].
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</p>
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</dd>
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</dl>
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## <dfn>RTCEncodedVideoFrame</dfn> interface ## {#RTCEncodedVideoFrame-interface}
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<pre class="idl">
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// New interfaces to define encoded video and audio frames. Will eventually
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// re-use or extend the equivalent defined in WebCodecs.
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[Exposed=(Window,DedicatedWorker)]
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interface RTCEncodedVideoFrame {
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readonly attribute RTCEncodedVideoFrameType type;
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readonly attribute unsigned long timestamp; // RTP timestamp.
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readonly attribute unsigned long timestamp;
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attribute ArrayBuffer data;
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RTCEncodedVideoFrameMetadata getMetadata();
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};
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</pre>
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### Members ### {#RTCEncodedVideoFrame-members}
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<dl data-link-for="RTCEncodedVideoFrame"
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data-dfn-for="RTCEncodedVideoFrame"
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class="dictionary-members">
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<dt>
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<dfn>type</dfn> of type <span class="idlMemberType">RTCEncodedVideoFrameType</span>
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</dt>
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<dd>
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<p>
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The type attribute allows the application to determine when a key frame is being
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sent or received.
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</p>
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</dd>
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<dt>
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<dfn>timestamp</dfn> of type <span class="idlMemberType">unsigned long</span>
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</dt>
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<dd>
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<p>
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The RTP timestamp identifier is an unsigned integer value per [[RFC3550]]
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that reflects the sampling instant of the first octet in the RTP data packet.
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</p>
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</dd>
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<dt>
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<dfn>data</dfn> of type <span class="idlMemberType">ArrayBuffer</span>
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</dt>
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<dd>
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<p>
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The encoded frame data.
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</p>
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</dd>
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</dl>
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### Methods ### {#RTCEncodedVideoFrame-methods}
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<dl data-link-for="RTCEncodedVideoFrame"
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data-dfn-for="RTCEncodedVideoFrame"
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class="dictionary-members">
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<dt>
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<dfn data-dfn-for="RTCEncodedVideoFrame" data-dfn-type="method">getMetadata()</dfn>
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</dt>
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<dd>
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<p>
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Returns the metadata associated with the frame.
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</p>
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</dd>
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</dl>
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## <dfn>RTCEncodedAudioFrameMetadata</dfn> dictionary ## {#RTCEncodedAudioFrameMetadata}
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<pre class="idl">
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dictionary RTCEncodedAudioFrameMetadata {
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unsigned long synchronizationSource;
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octet payloadType;
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sequence&lt;unsigned long&gt; contributingSources;
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};
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</pre>
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### Members ### {#RTCEncodedAudioFrameMetadata-members}
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<dl data-link-for="RTCEncodedAudioFrameMetadata"
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data-dfn-for="RTCEncodedAudioFrameMetadata"
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class="dictionary-members">
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<dt>
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<dfn>synchronizationSource</dfn> of type <span class="idlMemberType">unsigned long</span>
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</dt>
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<dd>
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<p>
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The synchronization source (ssrc) identifier is an unsigned integer value per [[RFC3550]]
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used to identify the stream of RTP packets that the encoded frame object is describing.
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</p>
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</dd>
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<dt>
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<dfn>payloadType</dfn> of type <span class="idlMemberType">octet</span>
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</dt>
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<dd>
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<p>
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The payload type is an unsigned integer value in the range from 0 to 127 per [[RFC3550]]
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that is used to describe the format of the RTP payload.
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</p>
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</dd>
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<dt>
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<dfn>contributingSources</dfn> of type <span class=
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"idlMemberType">sequence&lt;unsigned long&gt;</span>
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</dt>
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<dd>
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<p>
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The list of contribution sources (csrc list) as defined in [[RFC3550]].
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</p>
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</dd>
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</dl>
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## <dfn>RTCEncodedAudioFrame</dfn> interface ## {#RTCEncodedAudioFrame-interface}
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<pre class="idl">
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[Exposed=(Window,DedicatedWorker)]
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interface RTCEncodedAudioFrame {
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readonly attribute unsigned long timestamp; // RTP timestamp.
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readonly attribute unsigned long timestamp;
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attribute ArrayBuffer data;
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RTCEncodedAudioFrameMetadata getMetadata();
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};
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</pre>
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### Members ### {#RTCEncodedAudioFrame-members}
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<dl data-link-for="RTCEncodedAudioFrame"
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data-dfn-for="RTCEncodedAudioFrame"
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class="dictionary-members">
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<dt>
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<dfn>timestamp</dfn> of type <span class="idlMemberType">unsigned long</span>
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</dt>
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<dd>
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<p>
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The RTP timestamp identifier is an unsigned integer value per [[RFC3550]]
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that reflects the sampling instant of the first octet in the RTP data packet.
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</p>
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</dd>
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<dt>
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<dfn>data</dfn> of type <span class="idlMemberType">ArrayBuffer</span>
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</dt>
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<dd>
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<p>
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The encoded frame data.
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</p>
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</dd>
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</dl>
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### Methods ### {#RTCEncodedAudioFrame-methods}
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<dl data-link-for="RTCEncodedAudioFrame"
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data-dfn-for="RTCEncodedAudioFrame"
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class="dictionary-members">
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<dt>
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<dfn data-dfn-for="RTCEncodedAudioFrame" data-dfn-type="method">getMetadata()</dfn>
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</dt>
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<dd>
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<p>
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Returns the metadata associated with the frame.
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</p>
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</dd>
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</dl>
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// New interfaces to expose JavaScript-based transforms.
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// New interfaces to expose JavaScript-based transforms.
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##Interfaces
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<pre class="idl">
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[Exposed=DedicatedWorker]
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interface RTCTransformEvent : Event {
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readonly attribute RTCRtpScriptTransformer transformer;
@@ -418,7 +624,7 @@ The <dfn>generate key frame algorithm</dfn>, given |promise|, |encoder| and |rid
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For any {{RTCRtpScriptTransformer}} named |transformer|, the following steps are run just before any |frame| is enqueued in |transformer|.`[[readable]]`:
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1. Let |encoder| be |transformer|.`[[encoder]]`.
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1. If |encoder| or |encoder|.`[[pendingKeyFrameTasks]]` is undefined, abort these steps.
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1. If |frame| is not a video key frame, abort these steps.
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1. If |frame| is not a video {{RTCEncodedVideoFrameType/"key"}} frame, abort these steps.
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1. For each |task| in |encoder|.`[[pendingKeyFrameTasks]]`, run the following steps:
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1. If |frame| was generated by a video encoder identified by |task|.`[[rid]]`, run the following steps:
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1. Remove |task| from |encoder|.`[[pendingKeyFrameTasks]]`.

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