Re: Proposed Changes to ULE text - Format descriptors for SI signalling

[Gorry Fairhurst <gorry@erg.abdn.ac.uk>]

After receiving a few suggestions, I now propose better text for the 
description of the format identifier:

Page 3, Section 1 (Introduction):
AFTER:
  "The MPEG-2 specification [ISO-MPEG2] requires conformant TS
   Multiplexes to provide Program Specific Information (PSI) for
   each stream in the TS Multiplex. Other MPEG-2 based transmission
   standards may also define Service Information (SI)."
                                                      ^
INSERT BLANK LINE AND NEW PARAGRAPH after the above:
  "A format_identifier value has been registered for ULE [ULE1].
   This 32 bit number has a hexadecimal value of 0x554C4531.
   Transport Streams that utilise the Programme Map Table (PMT)
   defined in ISO 13818-1 [ISO-MPEG2] and that use the ULE
   format defined in this document, SHOULD insert a descriptor with
   this value in the PMT ES_info descriptor loop."

Best wishes,

Gorry

Gorry Fairhurst wrote:

> The ULE Spec is now completing IESG review, and will soon be ready for 
> publishing as an RFC. With this in mind, the authors of ULE have 
> progressed with registering a code-point for the SI that describes ULE.  
> They propose an update the ULE Spec to include the appropriate text 
> describing this, prior to publication as an RFC.
>
> As I see it, there are three threads to this process - ISO format_id; 
> DVB data_broadcast_id; and stream_type.
>
> Please send thoughts on any or all of the points below to the mailing 
> list...
>
> Best wishes,
>
> gorry
>
> -----
> 1) Format ID
>
> Proposed additional text for ULE RFC to specify what to do with PMTs on 
> page 3:
>
> Old:
>   "The MPEG-2 specification [ISO-MPEG2] requires conformant TS
>    Multiplexes to provide Program Specific Information (PSI) for
>    each stream in the TS Multiplex. Other MPEG-2 based transmission
>    standards may also define Service Information (SI)."
>
> New:
>   "The MPEG-2 specification [ISO-MPEG2] requires conformant TS
>    Multiplexes to provide Program Specific Information (PSI) for
>    each stream in the TS Multiplex. Other MPEG-2 based transmission
>    standards may also define Service Information (SI).
>
>   "A format_identifier value has been registered with the SMPTE RA
>    [ULE1], for ULE. This has the hexadecimal value 0x554C4531
>    ("ULE1"). Transport Streams that utilise the Programme
>    Map Table (PMT) defined in ISO 13818-1 and that use the ULE
>    format defined in this document, SHOULD insert a descriptor with
>    this value in the PMT ES_info descriptor loop."
>
> Add:
> [ULE1] Registration for format_identifier ULE1, SMPTE Registration 
> Authority, LLC, http://www.smpte-ra.org/ule1.html.
>
> -----
> 2) Data broadcast descriptor
>
> Although this was proposed at the last IETF meeting and via the mailing 
> list, this has not currently been progressed. We can not currently see a 
> specific need for this descriptor for ULE streams - the conventional use 
> of the descriptor for MPEG Tables makes this less appropriate than (1) 
> as a general-purpose method. A registration for ULE could still be done 
> (before or after publishing the ULE RFC). Is there a need to do this now?
>
> -----
> 3) Stream Type
>
> As I understand, stream_type values are not normatively assigned by ISO, 
> but conventions are documented by DVB and ATSC. We propose to continue 
> to progress with requesting a value for ULE (starting with ATSC). It is 
> not clear to me that the value needs to be specified in the published 
> RFC - what do others think?