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Changes to support the new substreams construct for MUX flows #61

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Changes to support the new substreams construct for MUX flows #61

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89a619f
Update constraint_set.json
cristian-recoseanu Oct 17, 2023
7fd09de
Update README.md
cristian-recoseanu Oct 17, 2023
fe9d5e0
Update constraint_set.json
cristian-recoseanu Oct 17, 2023
e6e092e
Change "MUX" to "mux"
cristian-recoseanu Oct 18, 2023
b15f5f2
Update substream text
peterbrightwell Oct 24, 2023
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13 changes: 13 additions & 0 deletions capabilities/README.md
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Expand Up @@ -251,6 +251,19 @@ It MAY be used in place of the file with the same name in the AMWA BCP-004-01 sp
- **Target:** (a) Sender `st2110_21_sender_type` (defined in the [Sender Attributes](../sender-attributes/#st-2110-21-sender-type) register), (b) SDP attribute `a=fmtp:` format-specific parameter `TP`
- **Applicability:** AMWA IS-04

## Substream Constraints

Mux Senders create IS-04 Flow objects for each subflow included in the mux Flow.
The mux Flow links to each subflow object using the IS-04 [`parents`](https://specs.amwa.tv/is-04/latest/docs/Data_Model_-_Identifier_Mapping.html#source-and-flow-representation) attribute.
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Suggested change
Mux Senders create IS-04 Flow objects for each subflow included in the mux Flow.
The mux Flow links to each subflow object using the IS-04 [`parents`](https://specs.amwa.tv/is-04/latest/docs/Data_Model_-_Identifier_Mapping.html#source-and-flow-representation) attribute.
Mux Senders create IS-04 Flow resources for each subflow included in the mux Flow.
The mux Flow links to each subflow resource using the IS-04 [`parents`](https://specs.amwa.tv/is-04/latest/docs/Data_Model_-_Identifier_Mapping.html#source-and-flow-representation) attribute.

(Generally we haven't used latest URL but linked to a particular spec version.)


### Substreams
- **Name:** `urn:x-nmos:substreams`
- **Description:** Identifies any per substream constraints.
- **Specification:** per AMWA BCP-004-01
- **Type:** array of objects (as per [AMWA BCP-004-01](https://specs.amwa.tv/bcp-004-01/))
- **Target:** mux Sender subflows and their associated attributes targeted by individual Substream Parameter Constraints
- **Applicability:** AMWA IS-04

[RFC-4566]: https://tools.ietf.org/html/rfc4566 "SDP: Session Description Protocol"
[RFC-9134]: https://tools.ietf.org/html/rfc9134 "RTP Payload Format for ISO/IEC 21122 (JPEG XS)"
[color-sampling]: https://www.iana.org/assignments/media-type-sub-parameters/media-type-sub-parameters.xhtml#media-type-sub-parameters-15 "Media Type Sub-Parameter Registry for video/raw: Color (sub-)sampling"
7 changes: 7 additions & 0 deletions capabilities/constraint_set.json
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Expand Up @@ -18,6 +18,13 @@
"type": "boolean",
"default": true
},
"urn:x-nmos:substreams": {
"description": "This exposes any substream constraints.",
"type": "array",
"items": {
"$ref": "substream_constraints.json"
}
},
"urn:x-nmos:cap:format:media_type": {
"$ref": "param_constraint_string.json"
},
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