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Introduce RTCEncodedFrameMetadata dictionary (#250)
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‎index.bs‎

Lines changed: 102 additions & 179 deletions
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@@ -318,8 +318,104 @@ The <dfn method for="SFrameTransform">setEncryptionKey(|key|, |keyID|)</dfn> met
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# RTCRtpScriptTransform # {#scriptTransform}
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In this section, the capture system refers to the system where media is sourced from and the sender system
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refers to the system that is sending RTP and RTCP packets to the receiver system where {{RTCEncodedVideoFrameMetadata}} data
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or {{RTCEncodedAudioFrameMetadata}} data is populated.
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refers to the system that is sending RTP and RTCP packets to the receiver system where {{RTCEncodedFrameMetadata}} data is populated.
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## <dfn dictionary>RTCEncodedFrameMetadata</dfn> dictionary ## {#RTCEncodedFrameMetadata}
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<pre class="idl">
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dictionary RTCEncodedFrameMetadata {
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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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unsigned long rtpTimestamp;
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DOMHighResTimeStamp receiveTime;
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DOMHighResTimeStamp captureTime;
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DOMHighResTimeStamp senderCaptureTimeOffset;
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DOMString mimeType;
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};
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</pre>
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### Members ### {#RTCEncodedFrameMetadata-members}
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<dl dfn-for="RTCEncodedFrameMetadata" class="dictionary-members">
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<dt>
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<dfn dict-member>synchronizationSource</dfn> <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 dict-member>payloadType</dfn> <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 dict-member>contributingSources</dfn> <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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<dt>
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<dfn dict-member>rtpTimestamp</dfn> <span class=
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"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 dict-member>receiveTime</dfn> <span class=
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"idlMemberType">DOMHighResTimeStamp</span>
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</dt>
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<dd>
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<p>
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For frames coming from an RTCRtpReceiver, represents the timestamp
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of the last received packet used to produce this media frame. This
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timestamp is relative to {{Performance}}.{{Performance/timeOrigin}}.
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</p>
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</dd>
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<dt>
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<dfn dict-member>captureTime</dfn> <span class="idlMemberType">DOMHighResTimeStamp</span>
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</dt>
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<dd>
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<p>
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The capture time of this frame in the capture system's clock.
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On populating this member, the user agent MUST return the value of the frame's `[[captureTime]]` slot,
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shifted to be relative to {{Performance}}.{{Performance/timeOrigin}}.
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</p>
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</dd>
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<dt>
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<dfn dict-member>senderCaptureTimeOffset</dfn> <span class="idlMemberType">DOMHighResTimeStamp</span>
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</dt>
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<dd>
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<p>
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The {{RTCEncodedFrameMetadata/senderCaptureTimeOffset}} is the sender system's estimate of the offset
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between its own NTP clock and the capture system's NTP clock, for the same frame that the
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{{RTCEncodedFrameMetadata/captureTime}} was originated from.
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On populating this member, the user agent MUST return the value of the frame's `[[senderCaptureTimeOffset]]` slot.
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</p>
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</dd>
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<dt>
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<dfn dict-member>mimeType</dfn> <span class="idlMemberType">DOMString</span>
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</dt>
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<dd>
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<p>
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The codec MIME media type/subtype defined in the IANA media types registry
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[[!IANA-MEDIA-TYPES]], e.g. audio/opus or video/VP8.
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</p>
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</dd>
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</dl>
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## <dfn enum>RTCEncodedVideoFrameType</dfn> dictionary ## {#RTCEncodedVideoFrameType}
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<pre class="idl">
@@ -374,22 +470,14 @@ enum RTCEncodedVideoFrameType {
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## <dfn dictionary>RTCEncodedVideoFrameMetadata</dfn> dictionary ## {#RTCEncodedVideoFrameMetadata}
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<pre class="idl">
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dictionary RTCEncodedVideoFrameMetadata {
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dictionary RTCEncodedVideoFrameMetadata : RTCEncodedFrameMetadata {
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unsigned long long frameId;
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sequence&lt;unsigned long long&gt; dependencies;
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unsigned short width;
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unsigned short height;
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unsigned long spatialIndex;
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unsigned long temporalIndex;
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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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long long timestamp; // microseconds
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unsigned long rtpTimestamp;
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DOMHighResTimeStamp receiveTime;
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DOMHighResTimeStamp captureTime;
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DOMHighResTimeStamp senderCaptureTimeOffset;
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DOMString mimeType;
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};
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</pre>
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@@ -415,33 +503,6 @@ dictionary RTCEncodedVideoFrameMetadata {
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Only present for received frames if the AV1 Dependency Descriptor Header Extension defined in Appendix A of [[AV1-RTP-SPEC]] is present.
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</p>
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</dd>
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<dt>
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<dfn dict-member>synchronizationSource</dfn> <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 dict-member>payloadType</dfn> <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 dict-member>contributingSources</dfn> <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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<dt>
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<dfn dict-member>timestamp</dfn> <span class=
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"idlMemberType">long long</span>
@@ -452,58 +513,6 @@ dictionary RTCEncodedVideoFrameMetadata {
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{{VideoFrame/timestamp}} for raw frames which correspond to this frame.
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</p>
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</dd>
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<dt>
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<dfn dict-member>rtpTimestamp</dfn> <span class=
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"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 dict-member>receiveTime</dfn> <span class=
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"idlMemberType">DOMHighResTimeStamp</span>
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</dt>
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<dd>
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<p>
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For frames coming from an RTCRtpReceiver, represents the timestamp
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of the last received packet used to produce this video frame. This
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timestamp is relative to {{Performance}}.{{Performance/timeOrigin}}.
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Only exists for incoming video frames.
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</p>
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</dd>
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<dt>
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<dfn dict-member>captureTime</dfn> <span class="idlMemberType">DOMHighResTimeStamp</span>
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</dt>
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<dd>
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<p>
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The capture time of this frame in the capture system's clock.
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On populating this member, the user agent MUST return the value of the frame's `[[captureTime]]` slot,
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shifted to be relative to {{Performance}}.{{Performance/timeOrigin}}.
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</p>
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</dd>
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<dt>
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<dfn dict-member>senderCaptureTimeOffset</dfn> <span class="idlMemberType">DOMHighResTimeStamp</span>
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</dt>
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<dd>
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<p>
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The {{RTCEncodedVideoFrameMetadata/senderCaptureTimeOffset}} is the sender system's estimate of the offset
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between its own NTP clock and the capture system's NTP clock, for the same frame that the
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{{RTCEncodedVideoFrameMetadata/captureTime}} was originated from.
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On populating this member, the user agent MUST return the value of the frame's `[[senderCaptureTimeOffset]]` slot.
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</p>
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</dd>
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<dt>
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<dfn dict-member>mimeType</dfn> <span class="idlMemberType">DOMString</span>
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</dt>
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<dd>
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<p>
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The codec MIME media type/subtype defined in the IANA media types registry
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[[!IANA-MEDIA-TYPES]], e.g. video/VP8.
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</p>
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</dd>
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</dl>
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@@ -567,7 +576,7 @@ interface RTCEncodedVideoFrame {
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<p>
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The encoded frame data. The format of the data depends on the video codec that is
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used to encode/decode the frame which can be determined by looking at the
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{{RTCEncodedVideoFrameMetadata/mimeType}}.
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{{RTCEncodedFrameMetadata/mimeType}}.
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For <a href="https://w3c.github.io/webrtc-svc/">SVC</a>, each spatial layer
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is transformed separately.
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</p>
@@ -672,48 +681,13 @@ An implementation is therefore free to choose whatever method works best.
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## <dfn dictionary>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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dictionary RTCEncodedAudioFrameMetadata : RTCEncodedFrameMetadata {
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short sequenceNumber;
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unsigned long rtpTimestamp;
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DOMHighResTimeStamp receiveTime;
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DOMHighResTimeStamp captureTime;
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DOMHighResTimeStamp senderCaptureTimeOffset;
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DOMString mimeType;
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double audioLevel;
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};
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</pre>
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### Members ### {#RTCEncodedAudioFrameMetadata-members}
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<dl dfn-for="RTCEncodedAudioFrameMetadata" class="dictionary-members">
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<dt>
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<dfn dict-member>synchronizationSource</dfn> <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 dict-member>payloadType</dfn> <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 dict-member>contributingSources</dfn> <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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<dt>
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<dfn dict-member>sequenceNumber</dfn> <span class=
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"idlMemberType">short</span>
@@ -726,57 +700,6 @@ dictionary RTCEncodedAudioFrameMetadata {
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Comparing two sequence numbers requires serial number arithmetic described in [[RFC1982]].
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</p>
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</dd>
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<dt>
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<dfn dict-member>rtpTimestamp</dfn> <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 dict-member>receiveTime</dfn> <span class=
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"idlMemberType">DOMHighResTimeStamp</span>
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</dt>
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<dd>
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<p>
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For frames coming from an RTCRtpReceiver, represents the timestamp
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of the last received packet used to produce this audio frame. This
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timestamp is relative to {{Performance}}.{{Performance/timeOrigin}}.
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Only exists for incoming audio frames.
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</p>
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</dd>
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<dt>
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<dfn dict-member>captureTime</dfn> <span class="idlMemberType">DOMHighResTimeStamp</span>
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</dt>
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<dd>
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<p>
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The capture time of this frame in the capture system's clock.
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On populating this member, the user agent MUST return the value of the frame's `[[captureTime]]` slot,
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shifted to be relative to {{Performance}}.{{Performance/timeOrigin}}.
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</p>
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</dd>
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<dt>
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<dfn dict-member>senderCaptureTimeOffset</dfn> <span class="idlMemberType">DOMHighResTimeStamp</span>
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</dt>
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<dd>
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<p>
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The {{RTCEncodedAudioFrameMetadata/senderCaptureTimeOffset}} is the sender system's estimate of the offset
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between its own NTP clock and the capture system's NTP clock, for the same frame that the
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{{RTCEncodedAudioFrameMetadata/captureTime}} was originated from.
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On populating this member, the user agent MUST return the value of the frame's `[[senderCaptureTimeOffset]]` slot.
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</p>
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</dd>
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<dt>
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<dfn dict-member>mimeType</dfn> <span class="idlMemberType">DOMString</span>
773-
</dt>
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<dd>
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<p>
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The codec MIME media type/subtype defined in the IANA media types registry
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[[!IANA-MEDIA-TYPES]], e.g. audio/opus.
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</p>
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</dd>
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<dt>
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<dfn dict-member>audioLevel</dfn> <span class="idlMemberType">double</span>
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</dt>
@@ -836,7 +759,7 @@ interface RTCEncodedAudioFrame {
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<p>
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The encoded frame data. The format of the data depends on the audio codec that is
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used to encode/decode the frame which can be determined by looking at the
839-
{{RTCEncodedAudioFrameMetadata/mimeType}}.
762+
{{RTCEncodedFrameMetadata/mimeType}}.
840763
The following table gives a number of examples:
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</p>
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<table class="simple">

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