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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>[cc: x3d-public]<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Not much else was needed to finish X3D4 Sound component. Simply<o:p></o:p></p><ul style='margin-top:0in' type=disc><li class=MsoListParagraph style='margin-left:0in;mso-list:l5 level1 lfo8'>Authoritative reference for MP4<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l5 level1 lfo8'>Discernment whether MFString is best way to represent W3C streamIdentifier<o:p></o:p></li></ul><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>We worked on this again today. Reference:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><table class=MsoNormalTable border=0 cellspacing=5 cellpadding=0 summary=""><tr><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><b>I14496-14</b><o:p></o:p></p></td><td style='padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal>ISO/IEC 14496-14:2020, <i>Information technology — Coding of audio-visual objects — Part 14: MP4 file format</i><o:p></o:p></p></td></tr></table><p class=MsoNormal><o:p> </o:p></p><ul style='margin-top:0in' type=disc><li class=MsoListParagraph style='margin-left:0in;mso-list:l5 level1 lfo8'>Mantis 1267: Strategies to Improve X3Dv4 Audio and Sound Component<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l5 level1 lfo8'><a href="https://www.web3d.org/member-only/mantis/view.php?id=1267">https://www.web3d.org/member-only/mantis/view.php?id=1267</a><o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l5 level1 lfo8'>Confirmed that W3C Recommendation draft uses string identifier, thus X3D type MFString is appropriate.<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l5 level1 lfo8'>Currently resolved by pushing to X3D4.1 so that later updates of that draft can be addressed.<o:p></o:p></li></ul><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Further comment welcome, but it looks like we are done! Once again thanks, Efi and Thanos.<o:p></o:p></p><div><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></div><p class=MsoNormal><o:p> </o:p></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> Brutzman, Donald (Don) (CIV) <br><b>Sent:</b> Saturday, April 9, 2022 1:54 PM<br><b>To:</b> Eftychia Lakka <efilakka@gmail.com>; 'athanasios.malamos@gmail.com' <athanasios.malamos@gmail.com><br><b>Cc:</b> Richard F. Puk (puk@igraphics.com) <puk@igraphics.com>; Nicholas Polys <npolys@vt.edu>; brutzman@nps.edu<br><b>Subject:</b> finishing X3D4 Sound component<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Efi and Thanos: we still have a few editorial comments that need to be completed.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Can you please work on these so that we can finish sound component. TIA.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><ul style='margin-top:0in' type=disc><li class=MsoListParagraph style='margin-left:0in;mso-list:l3 level1 lfo3'>https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/components/sound.html<o:p></o:p></li><li class=MsoListParagraph style='margin-left:0in;mso-list:l3 level1 lfo3'>https://www.web3d.org/member-only/mantis/view.php?id=1267<o:p></o:p></li></ul><div style='border:none;border-bottom:solid windowtext 1.5pt;padding:0in 0in 1.0pt 0in'><p class=MsoNormal><o:p> </o:p></p></div><h2><a name=AudioEncodingFormats>16.2.6 Audio encoding formats</a><o:p></o:p></h2><p>Browsers shall support at least the <i>wavefile</i> format in uncompressed PCM format (see <a href="https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/bibliography.html#WAV">[WAV]</a>). <o:p></o:p></p><p>It is recommended that browsers support the MIDI file type 1 sound format (see <a href="https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/references.html#MIDI-1">[MIDI 1.0]</a>). MIDI files are presumed to use the General MIDI patch set. <br>Browser support is also recommended for MIDI 2.0 (see <a href="https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/references.html#MIDI-2">[MIDI 2.0]</a> and Web MIDI API (see <a href="https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/references.html#W3C-WebMIDI">[W3C-WebMIDI]</a>). <o:p></o:p></p><p>It is also recommended that browsers support the following formats: <o:p></o:p></p><ul type=disc><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo6'>Format=MP3, container=MP3, compressed (see <a href="https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/references.html#I11172_1">[I11172-1]</a>). <o:p></o:p></li><li class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l2 level1 lfo6'>Format=AAC, container=MP4 <span class=editorsnote><span style='background:aqua;mso-highlight:aqua'>TODO: reference</span></span> <o:p></o:p></li></ul><div style='border:none;border-bottom:solid windowtext 1.5pt;padding:0in 0in 1.0pt 0in'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><o:p> </o:p></p></div><h2>16.4.19 StreamAudioDestination<o:p></o:p></h2><p class=MsoNormal>and<o:p></o:p></p><h2>16.4.20 StreamAudioSource<o:p></o:p></h2><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Courier New"'> <span style='background:aqua;mso-highlight:aqua'>MFString [in,out] streamIdentifier []<o:p></o:p></span></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span class=editorsnote><span style='background:aqua;mso-highlight:aqua'>The <i>streamIdentifier</i> field conforms to requirements of W3C Media Capture and Streams <a href="https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-CD1/Part01/references.html#W3C-Media">[W3C-Media]</a>.</span></span><o:p></o:p></p><ul type=disc><li class=MsoListParagraph style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:0in;mso-list:l2 level1 lfo6'>W3C-Media<o:p></o:p></li><li class=MsoListParagraph style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:0in;mso-list:l2 level1 lfo6'>Media Capture and Streams, World Wide Web Consortium (W3C) Candidate Recommendation Draft, 10 March 2022<o:p></o:p></li><li class=MsoListParagraph style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:0in;mso-list:l2 level1 lfo6'>https://www.w3.org/TR/mediacapture-streams<o:p></o:p></li></ul><div style='border:none;border-bottom:solid windowtext 1.5pt;padding:0in 0in 1.0pt 0in'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><o:p> </o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>thanks<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 <a href="mailto:brutzman@nps.edu">brutzman@nps.edu</a><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></body></html>