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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>Thanos: Doug Sanden (gpugroup, FreeWRL implementer) has made a number of recommendations on x3d-public mailing list regarding X3D 4.0 Sound component.<o:p></o:p></p><ul style='margin-top:0in' type=disc><li class=MsoListParagraph style='margin-left:0in;mso-list:l2 level1 lfo4'>X3D4 Architecture, clause 16 Sound component<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l2 level1 lfo4'>https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-DIS/Part01/components/sound.html<o:p></o:p></li></ul><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>As discussed, am hoping you (and perhaps Efi) can make time to look at them. Our driving factor is correctly achieving full compliance with <o:p></o:p></p><ul style='margin-top:0in' type=disc><li class=MsoListParagraph style='margin-left:0in;mso-list:l0 level1 lfo3'>W3C Web Audio API<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l0 level1 lfo3'>https://www.w3.org/TR/webaudio<o:p></o:p></li></ul><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Suggested group approach: first triage and then refine each suggested change. Categories:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><ol style='margin-top:0in' start=1 type=a><li class=MsoListParagraph style='margin-left:0in;mso-list:l3 level1 lfo1'><i>Essential</i>. Necessary change for final X3D 4.0 to correctly support Web Audio API Recommendation, completing Draft International Specification (DIS) review corrections.<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l3 level1 lfo1'><i>Next</i>. Important recommended change for browser implementers and follow-on X3D 4.1 specification.<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l3 level1 lfo1'><i>Future</i>. Informational, deserving of further extensibility work through implementation and evaluation.<o:p></o:p></li></ol><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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.<o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>all the best, Don<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>-- <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Don Brutzman Naval Postgraduate School, Code USW/Br brutzman@nps.edu<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'>X3D graphics, virtual worlds, Navy robotics https://</span> <span style='font-size:10.0pt;font-family:"Courier New"'>faculty.nps.edu/brutzman<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> x3d-public <x3d-public-bounces@web3d.org> <b>On Behalf Of </b>GPU Group<br><b>Sent:</b> Thursday, February 16, 2023 6:45 AM<br><b>To:</b> X3D Graphics public mailing list <x3d-public@web3d.org><br><b>Subject:</b> [x3d-public] Sound v4 Recommendations - Splitter/Merger/Selector<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>Recommendations:<o:p></o:p></p><div><p class=MsoNormal>1. remove outputs field from ChannelSplitter<o:p></o:p></p></div><div><p class=MsoNormal>2. add 2 fields to ChannelMerger<o:p></o:p></p></div><div><p class=MsoNormal>MFInt32 indxSrc [in/out]<o:p></o:p></p></div><div><p class=MsoNormal>MFInt32 indxDst [in/out]<o:p></o:p></p></div><div><p class=MsoNormal>3. remove node ChannelSelector from specifications<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Explanation:<o:p></o:p></p></div><div><p class=MsoNormal>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. <o:p></o:p></p></div><div><p class=MsoNormal>If there aren't enough .children for all the indxSrc, the last child is repeated/re-used.<o:p></o:p></p></div><div><p class=MsoNormal>I have it working in an example scene<o:p></o:p></p></div><div><p class=MsoNormal><a href="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">https://freewrl.sourceforge.io/tests/16_Sound/SplitChannels6_children.x3d</a> <o:p></o:p></p></div><div><p class=MsoNormal>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.<o:p></o:p></p></div><div><p class=MsoNormal>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.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>-Doug<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div></div></body></html>