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draft-ietf-moq-transport.md

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@@ -1023,7 +1023,7 @@ SUBSCRIBE Message {
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[EndGroup (i),
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EndObject (i)],
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Number of Parameters (i),
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Track Request Parameters (..) ...
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Subscribe Parameters (..) ...
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}
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~~~
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{: #moq-transport-subscribe-format title="MOQT SUBSCRIBE Message"}
@@ -1061,8 +1061,7 @@ requested. Only present for "AbsoluteStart" and "AbsoluteRange" filter types.
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* EndObject: The end Object ID, plus 1. A value of 0 means the entire group is
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requested. Only present for the "AbsoluteRange" filter type.
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* Track Request Parameters: The parameters are defined in
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{{version-specific-params}}
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* Subscribe Parameters: The parameters are defined in {{version-specific-params}}.
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On successful subscription, the publisher MUST reply with a SUBSCRIBE_OK,
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allowing the subscriber to determine the start group/object when not explicitly
@@ -1098,7 +1097,7 @@ SUBSCRIBE_UPDATE Message {
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EndGroup (i),
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EndObject (i),
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Number of Parameters (i),
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Track Request Parameters (..) ...
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Subscribe Parameters (..) ...
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}
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~~~
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{: #moq-transport-subscribe-update-format title="MOQT SUBSCRIBE_UPDATE Message"}
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* EndObject: The end Object ID, plus 1. A value of 0 means the entire group is
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requested.
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* Track Request Parameters: The parameters are defined in
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{{version-specific-params}}
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* Subscribe Parameters: The parameters are defined in {{version-specific-params}}.
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## UNSUBSCRIBE {#message-unsubscribe}
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~~~
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## SUBSCRIBE {#message-subscribe-req}
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### Filter Types {#sub-filter}
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The subscriber specifies a filter on the subscription to allow
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the publisher to identify which objects need to be delivered.
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There are 4 types of filters:
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Latest Group (0x1) : Specifies an open-ended subscription with objects
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from the beginning of the current group.
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Latest Object (0x2): Specifies an open-ended subscription beginning from
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the current object of the current group.
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AbsoluteStart (0x3): Specifies an open-ended subscription beginning
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from the object identified in the StartGroup and StartObject fields.
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AbsoluteRange (0x4): Specifies a closed subscription starting at StartObject
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in StartGroup and ending at EndObject in EndGroup. The start and end of the
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range are inclusive. EndGroup and EndObject MUST specify the same or a later
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object than StartGroup and StartObject.
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A filter type other than the above MUST be treated as error.
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### SUBSCRIBE Format
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A subscriber issues a SUBSCRIBE to a publisher to request objects from a track.
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The format of SUBSCRIBE is as follows:
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~~~
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SUBSCRIBE Message {
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Subscribe ID (i),
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Track Alias (i),
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Track Namespace (b),
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Track Name (b),
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Filter Type (i),
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[StartGroup (i),
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StartObject (i)],
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[EndGroup (i),
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EndObject (i)],
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Number of Parameters (i),
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Subscribe Parameters (..) ...
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}
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~~~
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{: #moq-transport-subscribe-format title="MOQT SUBSCRIBE Message"}
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* Subscribe ID: The subscription identifier that is unique within the session.
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`Subscribe ID` is a monotonically increasing variable length integer which
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MUST not be reused within a session. `Subscribe ID` is used by subscribers and
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the publishers to identify a given subscription. Subscribers specify the
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`Subscribe ID` and it is included in the corresponding SUBSCRIBE_OK or
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SUBSCRIBE_ERROR messages.
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* Track Alias: A session specific identifier for the track.
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Messages that reference a track, such as OBJECT ({{message-object}}),
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reference this Track Alias instead of the Track Name and Track Namespace to
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reduce overhead. If the Track Alias is already in use, the publisher MUST
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close the session with a Duplicate Track Alias error ({{session-termination}}).
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* Track Namespace: Identifies the namespace of the track as defined in
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({{track-name}}).
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* Track Name: Identifies the track name as defined in ({{track-name}}).
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* Filter Type: Identifies the type of filter, which also indicates whether
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the StartGroup/StartObject and EndGroup/EndObject fields will be present.
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See ({{sub-filter}}).
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* StartGroup: The start Group ID. Only present for "AbsoluteStart" and
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"AbsoluteRange" filter types.
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* StartObject: The start Object ID, plus 1. A value of 0 means the entire group is
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requested. Only present for "AbsoluteStart" and "AbsoluteRange" filter types.
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* EndGroup: The end Group ID. Only present for the "AbsoluteRange" filter type.
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* EndObject: The end Object ID, plus 1. A value of 0 means the entire group is
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requested. Only present for the "AbsoluteRange" filter type.
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* Subscribe Parameters: The parameters are defined in {{version-specific-params}}.
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On successful subscription, the publisher MUST reply with a SUBSCRIBE_OK,
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allowing the subscriber to determine the start group/object when not explicitly
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specified and the publisher SHOULD start delivering objects.
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If a publisher cannot satisfy the requested start or end for the subscription it
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MAY send a SUBSCRIBE_ERROR with code 'Invalid Range'. A publisher MUST NOT send
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objects from outside the requested start and end.
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## SUBSCRIBE_UPDATE {#message-subscribe-update-req}
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A subscriber issues a SUBSCRIBE_UPDATE to a publisher to request a change to
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a prior subscription. Subscriptions can only become more narrower, not wider,
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because an attempt to widen a subscription could fail. If Objects before the
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start or after the end of the current subscription are needed, a separate
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subscription can be made. The start Object MUST NOT decrease and when it increases,
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there is no guarantee that a publisher will not have already sent Objects before
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the new start Object. The end Object MUST NOT increase and when it decreases,
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there is no guarantee that a publisher will not have already sent Objects after
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the new end Object.
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Unlike a new subscription, SUBSCRIBE_UPDATE can not cause an Object to be
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delivered multiple times. Like SUBSCRIBE, EndGroup and EndObject MUST specify the
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same or a later object than StartGroup and StartObject.
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The format of SUBSCRIBE_UPDATE is as follows:
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~~~
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SUBSCRIBE_UPDATE Message {
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Subscribe ID (i),
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StartGroup (i),
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StartObject (i),
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EndGroup (i),
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EndObject (i),
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Number of Parameters (i),
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Subscribe Parameters (..) ...
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}
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~~~
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{: #moq-transport-subscribe-update-format title="MOQT SUBSCRIBE_UPDATE Message"}
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* Subscribe ID: The subscription identifier that is unique within the session.
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This MUST match an existing Subscribe ID.
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* StartGroup: The start Group ID.
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* StartObject: The start Object ID, plus 1. A value of 0 means the entire group
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is requested.
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* EndGroup: The end Group ID, plus 1. A value of 0 means the subscription is
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open-ended.
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* EndObject: The end Object ID, plus 1. A value of 0 means the entire group is
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requested.
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* Subscribe Parameters: The parameters are defined in {{version-specific-params}}.
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## SUBSCRIBE_OK {#message-subscribe-ok}
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A publisher sends a SUBSCRIBE_OK control message for successful

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