[x3d-public] Sound v4 Recommendations - Splitter/Merger/Selector

Thu Feb 16 11:06:49 PST 2023

 Here's a list of those x3d-public sound recommendations I made:

http://web3d.org/pipermail/x3d-public_web3d.org/2023-February/018430.html

- v4 Sound > Analyser node > RECOMMENDATION

http://web3d.org/pipermail/x3d-public_web3d.org/2023-February/018456.html

- Sound v4 suggestions

http://web3d.org/pipermail/x3d-public_web3d.org/2023-February/018514.html

- Sound v4 Recommendations - Splitter/Merger/Selector

http://web3d.org/pipermail/x3d-public_web3d.org/2023-January/018370.html

- web3d v4 draft specs > Sound component -Recommendation: remove gain field
except from gain node

http://web3d.org/pipermail/x3d-public_web3d.org/2023-January/018420.html

- Sound Component > v4 > Recommendations - remove TimeDependentNode
inheritance from sound processing nodes

 -Doug Sanden

On Thu, Feb 16, 2023 at 11:46 AM GPU Group <gpugroup at gmail.com> wrote:

> Yes, I won't have all nodes implemented by then, but hopefully the awkward
> nodes. I can produce marked-up html of 16 Sound Component
> 4.1a - show in orange the proposed fields to delete by removing slave-gain
> fields and processing node fields inherited from TimeDependentNode
> 4.1b- after 4.1a removals, shows additions(yellow) and
> subtractions(orange) to make nodes more functional and w3c web audio
> equivalent / compliant
> 4.1c- shows final clean proposal
> Then parts can be adopted for 4.0 as determined necessary by the group
> approach.
> I'll work up drafts of those in the next few days.
> I look forward to the Mar 3 discussion. (I've never been to Crete, but
> spent 14 months in Athens).
> -Doug Sanden
> PS I'm implementing in native code with Labsound lib -- a fork of (audio
> parts of) WebKit used in Chrome and Safari.
>
> On Thu, Feb 16, 2023 at 10:48 AM Brutzman, Donald (Don) (CIV) <
> brutzman at nps.edu> wrote:
>
>> Thanos:  Doug Sanden (gpugroup, FreeWRL implementer) has made a number of
>> recommendations on x3d-public mailing list regarding X3D 4.0 Sound
>> component.
>>
>>    - X3D4 Architecture, clause 16 Sound component
>>    -
>>    https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-DIS/Part01/components/sound.html
>>
>>
>>
>> As discussed, am hoping you (and perhaps Efi) can make time to look at
>> them.  Our driving factor is correctly achieving full compliance with
>>
>>    - W3C Web Audio API
>>    - https://www.w3.org/TR/webaudio
>>
>>
>>
>> Doug: thanks for pointing out alternatives whenever our design does not
>> closely/exactly match the Web Audio API.  That is key and a deciding
>> factor, since our design goal is to be able to create directly
>> corresponding audio graphs for each.  At some future point, I expect to
>> demonstrate this by creating XSLT stylesheets that convert X3D audio graphs
>> to simple ASCII-text trees (similar to HAnim outputs) and also JavaScript
>> source with matching Web Audio class invocations.
>>
>>
>>
>> Suggested group approach: first triage and then refine each suggested
>> change.  Categories:
>>
>>
>>
>>    1. *Essential*. Necessary change for final X3D 4.0 to correctly
>>    support Web Audio API Recommendation, completing Draft International
>>    Specification (DIS) review corrections.
>>    2. *Next*.  Important recommended change for browser implementers and
>>    follow-on X3D 4.1 specification.
>>    3. *Future*.  Informational, deserving of further extensibility work
>>    through implementation and evaluation.
>>
>>
>>
>> Am hoping we can have all recommendations and reactions posted and ready
>> for X3D Working Group meeting on Friday March 3.  Please advise if you
>> think that is possible – thanks for your continuing careful scrutiny.
>>
>>
>>
>> all the best, Don
>>
>> --
>>
>> Don Brutzman  Naval Postgraduate School, Code USW/Br
>> brutzman at nps.edu
>>
>> Watkins 270,  MOVES Institute, Monterey CA 93943-5000 USA
>> +1.831.656.2149
>>
>> X3D graphics, virtual worlds, Navy robotics https://
>> faculty.nps.edu/brutzman
>>
>>
>>
>> *From:* x3d-public <x3d-public-bounces at web3d.org> *On Behalf Of *GPU
>> Group
>> *Sent:* Thursday, February 16, 2023 6:45 AM
>> *To:* X3D Graphics public mailing list <x3d-public at web3d.org>
>> *Subject:* [x3d-public] Sound v4 Recommendations -
>> Splitter/Merger/Selector
>>
>>
>>
>> Recommendations:
>>
>> 1. remove outputs field from ChannelSplitter
>>
>> 2. add 2 fields to ChannelMerger
>>
>> MFInt32 indxSrc [in/out]
>>
>> MFInt32 indxDst [in/out]
>>
>> 3. remove node ChannelSelector from specifications
>>
>>
>>
>> Explanation:
>>
>> Merger will get is Splitter channels through its children field, and the
>> children are in the order of indxSrc[i[, so when making connections, Merger
>> iterates over indxSrc[i], and for each one renders the Merger.children[i],
>> and communicates indirectly with splitter (through a stack/state variable)
>> which of its outputs (or srcIndex) to connect to splitters most immediate
>> parent.
>>
>> If there aren't enough .children for all the indxSrc, the last child is
>> repeated/re-used.
>>
>> I have it working in an example scene
>>
>> https://freewrl.sourceforge.io/tests/16_Sound/SplitChannels6_children.x3d
>> <https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Ffreewrl.sourceforge.io%2Ftests%2F16_Sound%2FSplitChannels6_children.x3d&data=05%7C01%7Cbrutzman%40nps.edu%7C5c43bc95adce4c669b0208db102c8b30%7C6d936231a51740ea9199f7578963378e%7C0%7C0%7C638121555752983083%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=lOjmUJIGy6qCzAYK19LeQpyaIK7m21hbYL14bFaypn8%3D&reserved=0>
>>
>>
>> The indxDst, indxSrc are a 2-tuple, and there should be equal numbers of
>> them,  the recommended field names a) are similar to Web Audio srcIndx,
>> dstIndx so familiar to those working with web audio b) re-arranged to make
>> them alphabetical-order sequential in the specs, so its more obvious they
>> go together.
>>
>> The design eliminates the need for a separate ChannelSelector node (which
>> is ill-defined, and web audio doesn't have one) -- the same kind of
>> selections can be done with indxDst, indxSrc in ChannelMerger.
>>
>>
>>
>> -Doug
>>
>>
>>
>>
>>
>
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