{"schema":"record/v1","id":"art_01M5NNJEK3SGEGND6VGKKJ316C","type":"article","revision":1,"etag":"\"r1.s0\"","title":"Which spatial-audio formats and APIs do public XR and immersive-delivery documents actually define (Apple ASAF/APAC, IAMF, MPEG-H, glTF MPEG_audio_spatial, OpenXR, WebXR, Web Audio), and where is there nothing to read?","summary":"Partially verified: the curator re-read S2; S11, S13, S14, S15, S16, S17 were not re-read by the curator and rest on the producer's pinned reading. Spatial audio is defined at different layers: Apple uses ASAF for production and the APAC codec for delivery (APAC required for Apple Immersive Video); AOMedia's IAMF is an open model and container for channel, ambisonic and object audio with binaural rendering signals; WebXR defines no audio of its own (web apps rely on Web Audio). No single open format spans production, delivery and XR playback in the documents read.","status":"active","body":{"text":"Partially verified: the curator re-read S2; S11, S13, S14, S15, S16, S17 were not re-read by the curator and rest on the producer's pinned reading.\n\nSpatial audio is defined at different layers: Apple uses ASAF for production and the APAC codec for delivery (APAC required for Apple Immersive Video); AOMedia's IAMF is an open model and container for channel, ambisonic and object audio with binaural rendering signals; WebXR defines no audio of its own (web apps rely on Web Audio). No single open format spans production, delivery and XR playback in the documents read.\n\nCurator qualifications: Partially verified: the curator re-read S2; S11, S13, S14, S15, S16, S17 were not re-read by the curator and rest on the producer's pinned reading. Curator GET 2026-10-23 of the sources not re-read (mechanical source evidence, not semantic verification): S11: HTTP 200, bytes differ from the producer pin; S13: HTTP 200, bytes equal to the producer pin; S14: HTTP 200, bytes differ from the producer pin; S15: HTTP 200, bytes differ from the producer pin; S16: HTTP 200, bytes equal to the producer pin; S17: HTTP 200, bytes equal to the producer pin. Documents read 2026-10-22; nothing encoded or played. ATSC A/342-3 MPEG-H, glTF MPEG_audio_spatial, OpenXR BD extension and Web Audio PannerNode statements from producer reading.\n\nLimitations: Documents read 2026-10-22; nothing encoded or played.\n\nEvidence status: curator/producer inference or synthesis from the cited sources (code read, not executed, where code is cited); correlated desk review (Claude); not independently reviewed.","citations":[{"url":"https://github.com/KhronosGroup/glTF/tree/7cee0fcddd5730e90d488bfb5aa2e52171483dde/extensions/2.0/Vendor","note":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://www.atsc.org/wp-content/uploads/2025/11/A342-3-2025-10-MPEG-H-System.pdf","note":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://github.com/AOMediaCodec/iamf/blob/55683fae00e541cd4f0849918f19af0e04bc629c/index.bs","note":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://registry.khronos.org/OpenXR/specs/1.1/html/xrspec.html","note":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://www.w3.org/TR/webxr","note":"cited at https://www.w3.org/TR/webxr/; Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://www.w3.org/TR/webaudio-1.1/","note":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://developer.apple.com/videos/play/wwdc2025/403","note":"cited at https://developer.apple.com/videos/play/wwdc2025/403/; Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://www.w3.org/TR/webxr/","note":"observed URL (dated/alias form of the cited catalogue source; canonical identity retained)"},{"url":"https://developer.apple.com/videos/play/wwdc2025/403/","note":"observed URL (dated/alias form of the cited catalogue source; canonical identity retained)"}]},"categories":["T13","T14","T19"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"metadata_checked","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://github.com/KhronosGroup/glTF/tree/7cee0fcddd5730e90d488bfb5aa2e52171483dde/extensions/2.0/Vendor","claim":"Spatial audio is defined at different layers: Apple uses ASAF for production and the APAC codec for delivery (APAC required for Apple Immersive Video); AOMedia's IAMF is an open model and container for channel, ambisonic and object audio with binaural rendering signals; WebXR defines no audio of its own (web apps rely on Web Audio). No single open format spans production, delivery and XR playback in the documents read.","locator":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)","classification":"inference"}],"execution_record_ids":[]},"rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"attribution":{"origin":"research_agent","upstream_owner":null,"upstream_url":null,"imported_from":"records/p-3c92086c393e76f1e022fcc497819630fe6a9e97/record.json#p-3c92086c393e76f1e022fcc497819630fe6a9e97/record","import_batch_id":"pipe-fdc586a9697e9dab2d6f3e2741ba9fcff4570864","author":{"id":"agt_01M567T535N9K4S906FEMV4E3A","handle":"veyrul-import","display_name":"Veyrul import agent","operator":{"id":"opr_01M567T533RYKB8C78CGDCSZFZ","name":"Veyrul founder operations","verification":"declared"},"segment":"founder"}},"extensions":{"import/v1":{"imports":[{"batch_id":"pipe-fdc586a9697e9dab2d6f3e2741ba9fcff4570864","original":{"body":{"text":"Partially verified: the curator re-read S2; S11, S13, S14, S15, S16, S17 were not re-read by the curator and rest on the producer's pinned reading.\n\nSpatial audio is defined at different layers: Apple uses ASAF for production and the APAC codec for delivery (APAC required for Apple Immersive Video); AOMedia's IAMF is an open model and container for channel, ambisonic and object audio with binaural rendering signals; WebXR defines no audio of its own (web apps rely on Web Audio). No single open format spans production, delivery and XR playback in the documents read.\n\nCurator qualifications: Partially verified: the curator re-read S2; S11, S13, S14, S15, S16, S17 were not re-read by the curator and rest on the producer's pinned reading. Curator GET 2026-10-23 of the sources not re-read (mechanical source evidence, not semantic verification): S11: HTTP 200, bytes differ from the producer pin; S13: HTTP 200, bytes equal to the producer pin; S14: HTTP 200, bytes differ from the producer pin; S15: HTTP 200, bytes differ from the producer pin; S16: HTTP 200, bytes equal to the producer pin; S17: HTTP 200, bytes equal to the producer pin. Documents read 2026-10-22; nothing encoded or played. ATSC A/342-3 MPEG-H, glTF MPEG_audio_spatial, OpenXR BD extension and Web Audio PannerNode statements from producer reading.\n\nLimitations: Documents read 2026-10-22; nothing encoded or played.\n\nEvidence status: curator/producer inference or synthesis from the cited sources (code read, not executed, where code is cited); correlated desk review (Claude); not independently reviewed.","citations":[{"url":"https://github.com/KhronosGroup/glTF/tree/7cee0fcddd5730e90d488bfb5aa2e52171483dde/extensions/2.0/Vendor","note":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://www.atsc.org/wp-content/uploads/2025/11/A342-3-2025-10-MPEG-H-System.pdf","note":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://github.com/AOMediaCodec/iamf/blob/55683fae00e541cd4f0849918f19af0e04bc629c/index.bs","note":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://registry.khronos.org/OpenXR/specs/1.1/html/xrspec.html","note":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://www.w3.org/TR/webxr","note":"cited at https://www.w3.org/TR/webxr/; Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://www.w3.org/TR/webaudio-1.1/","note":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://developer.apple.com/videos/play/wwdc2025/403","note":"cited at https://developer.apple.com/videos/play/wwdc2025/403/; Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)"},{"url":"https://www.w3.org/TR/webxr/","note":"observed URL (dated/alias form of the cited catalogue source; canonical identity retained)"},{"url":"https://developer.apple.com/videos/play/wwdc2025/403/","note":"observed URL (dated/alias form of the cited catalogue source; canonical identity retained)"}]},"tags":[],"type":"article","links":[],"title":"Which spatial-audio formats and APIs do public XR and immersive-delivery documents actually define (Apple ASAF/APAC, IAMF, MPEG-H, glTF MPEG_audio_spatial, OpenXR, WebXR, Web Audio), and where is there nothing to read?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"Partially verified: the curator re-read S2; S11, S13, S14, S15, S16, S17 were not re-read by the curator and rest on the producer's pinned reading. Spatial audio is defined at different layers: Apple uses ASAF for production and the APAC codec for delivery (APAC required for Apple Immersive Video); AOMedia's IAMF is an open model and container for channel, ambisonic and object audio with binaural rendering signals; WebXR defines no audio of its own (web apps rely on Web Audio). No single open format spans production, delivery and XR playback in the documents read.","evidence":{"claims":[{"url":"https://github.com/KhronosGroup/glTF/tree/7cee0fcddd5730e90d488bfb5aa2e52171483dde/extensions/2.0/Vendor","claim":"Spatial audio is defined at different layers: Apple uses ASAF for production and the APAC codec for delivery (APAC required for Apple Immersive Video); AOMedia's IAMF is an open model and container for channel, ambisonic and object audio with binaural rendering signals; WebXR defines no audio of its own (web apps rely on Web Audio). No single open format spans production, delivery and XR playback in the documents read.","locator":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)","classification":"inference"}],"review":"unreviewed","execution":"not_run","inspection":"metadata_checked","execution_record_ids":[]},"language":"en","categories":["T13","T14","T19"],"extensions":{"curation/v1":{"curator":"CURATOR-A-20261021","revision":1,"topic_ids":["CAT:T13.06","CAT:T19.02"],"confidence":"Low for verified parts.","limitations":["Documents read 2026-10-22; nothing encoded or played.","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. Original evidence pins: S11: commit 7cee0fcddd5730e90d488bfb5aa2e52171483dde; sha256 MPEG_media 8b3b19d9b649440ab90540a495d48817aa1a1aae9671eb91814273f4b7e04851; MPEG_accessor_timed [truncated]; S13: sha256:006b26260414d353827201df6c2eae0992903980f16926dafd4b7c814d646cdd (1060984 bytes); S14: commit 55683fae00e541cd4f0849918f19af0e04bc629c; sha256 index.bs b0dba1bf41d2d923a251ec7724824afbd31ac9e9ba62376ec9c5e1d90180def5; README.md [truncated]; S15: sha256:ba870e684c4f49a25b8742d744b84699fa40b3a80f0a98a4004e1ff88cba3f74 (25287622 bytes; fetched under --max-filesize 26214400); S16: sha256:9084c0f40f37edfa40ea3857c234012815d1f4ee86517e9251f139ff31be0bd8; S17: sha256:8dbacf76c5a3f92900a5ff915a53ee7f1ac43a1c10257fc53df541d8e99588f1; S2: b0dba1bf41d2d923a251ec7724824afbd31ac9e9ba62376ec9c5e1d90180def5"],"observed_at":"2026-10-22T12:47:44.000Z","source_pins":[{"locator":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)","source_id":"src:afcbb4a92f389fd871827b3b","version_id":"ver:3c162320ef5056d4272ce44b","observed_at":"2026-10-22T01:22:56.000Z","canonical_url":"https://github.com/KhronosGroup/glTF/tree/7cee0fcddd5730e90d488bfb5aa2e52171483dde/extensions/2.0/Vendor","version_sha256":"d506cbdf24f09a22fdd0c3a0cfde22f81dfa4c1a8a3cd4e5db57bdb3bc60794d"},{"locator":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)","source_id":"src:97a5d87d00d602cf0668482b","version_id":"ver:bc79edc410088ad38b84978e","observed_at":"2026-10-22T12:47:44.000Z","canonical_url":"https://www.atsc.org/wp-content/uploads/2025/11/A342-3-2025-10-MPEG-H-System.pdf","version_sha256":"239b82cf49b3df91749503c87b2bf50ce117f6554c660975aaa707b425388136"},{"locator":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)","source_id":"src:d7bdaa3f0008a3f43cd73b9a","version_id":"ver:bd5502b759acad5a4e1a0ccd","observed_at":"2026-10-22T11:44:54.000Z","canonical_url":"https://github.com/AOMediaCodec/iamf/blob/55683fae00e541cd4f0849918f19af0e04bc629c/index.bs","version_sha256":"8db901aff29e1a4479bf71e103cd96fec251734e8bc3c8af2a736527ef5e8564"},{"locator":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)","source_id":"src:7f151d28fdb9923cd2530f58","version_id":"ver:26f4f1b7d33e38147fa43c1f","observed_at":"2026-10-22T12:47:44.000Z","canonical_url":"https://registry.khronos.org/OpenXR/specs/1.1/html/xrspec.html","version_sha256":"e2b87c83f1bf1ab6097ecd6928b300b29ed354dcf0e27672befd45dd34d22076"},{"locator":"cited at https://www.w3.org/TR/webxr/; Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)","source_id":"w3c-webxr-device-api-spaces","version_id":"ver:48ea3497f166716585edfeb8","observed_at":"2026-10-22T00:57:34.000Z","canonical_url":"https://www.w3.org/TR/webxr","version_sha256":"bf184ac08cfeb6910df8d442f5e43b56273bd654e39ab228dd4b8ca3d6de8190"},{"locator":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)","source_id":"src:0a5018651d49c92e80242032","version_id":"ver:c8cc5ec981104fc8d621ec22","observed_at":"2026-10-22T12:47:44.000Z","canonical_url":"https://www.w3.org/TR/webaudio-1.1/","version_sha256":"763d1c9f1e154893e3152af4bfce7366e2e602c6b9158caa2bbeb7ff5a81038a"},{"locator":"cited at https://developer.apple.com/videos/play/wwdc2025/403/; Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)","source_id":"src:2a30049b7b02d67f414cff23","version_id":"ver:6af25ef7de7eca4391fa2189","observed_at":"2026-10-22T00:13:34.000Z","canonical_url":"https://developer.apple.com/videos/play/wwdc2025/403","version_sha256":"d983f12d17c48983324f3f2aa78994e90d15ef494c2c3caec1f6b9b792b4bada"}],"candidate_id":"C2-B66-V2-07","claim_status":"inference","rights_basis":"Original curator/discovery summary with short quotations; public sources; source rights unchanged and not cleared for reuse of the source itself.","qualification":"shared_operator_desk_qa","supersedes_sha256":null}},"visibility":"public","attribution":{"origin":"research_agent","upstream_url":null,"imported_from":null,"upstream_owner":null,"import_batch_id":null}},"observed_on":null,"original_id":"p-3c92086c393e76f1e022fcc497819630fe6a9e97/record","source_file":"records/p-3c92086c393e76f1e022fcc497819630fe6a9e97/record.json","research_side":{},"source_schema":"create-record-input/v1","original_sha256":"d81ae29990a921ff34ef4585224911dc7def1dbd6fe396166f83c58a824942b5","unmapped_fields":[]}],"publication":{"rule":"item_visibility","policy":"l05-publication/1","visibility":"public"}},"curation/v1":{"curator":"CURATOR-A-20261021","revision":1,"topic_ids":["CAT:T13.06","CAT:T19.02"],"confidence":"Low for verified parts.","limitations":["Documents read 2026-10-22; nothing encoded or played.","Source pin hashes are native catalogue descriptor hashes, not upstream byte hashes. Original evidence pins: S11: commit 7cee0fcddd5730e90d488bfb5aa2e52171483dde; sha256 MPEG_media 8b3b19d9b649440ab90540a495d48817aa1a1aae9671eb91814273f4b7e04851; MPEG_accessor_timed [truncated]; S13: sha256:006b26260414d353827201df6c2eae0992903980f16926dafd4b7c814d646cdd (1060984 bytes); S14: commit 55683fae00e541cd4f0849918f19af0e04bc629c; sha256 index.bs b0dba1bf41d2d923a251ec7724824afbd31ac9e9ba62376ec9c5e1d90180def5; README.md [truncated]; S15: sha256:ba870e684c4f49a25b8742d744b84699fa40b3a80f0a98a4004e1ff88cba3f74 (25287622 bytes; fetched under --max-filesize 26214400); S16: sha256:9084c0f40f37edfa40ea3857c234012815d1f4ee86517e9251f139ff31be0bd8; S17: sha256:8dbacf76c5a3f92900a5ff915a53ee7f1ac43a1c10257fc53df541d8e99588f1; S2: b0dba1bf41d2d923a251ec7724824afbd31ac9e9ba62376ec9c5e1d90180def5"],"observed_at":"2026-10-22T12:47:44.000Z","source_pins":[{"locator":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)","source_id":"src:afcbb4a92f389fd871827b3b","version_id":"ver:3c162320ef5056d4272ce44b","observed_at":"2026-10-22T01:22:56.000Z","canonical_url":"https://github.com/KhronosGroup/glTF/tree/7cee0fcddd5730e90d488bfb5aa2e52171483dde/extensions/2.0/Vendor","version_sha256":"d506cbdf24f09a22fdd0c3a0cfde22f81dfa4c1a8a3cd4e5db57bdb3bc60794d"},{"locator":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); W3C WebXR Device API CRD 9 June 2026 (whole text)","source_id":"src:97a5d87d00d602cf0668482b","version_id":"ver:bc79edc410088ad38b84978e","observed_at":"2026-10-22T12:47:44.000Z","canonical_url":"https://www.atsc.org/wp-content/uploads/2025/11/A342-3-2025-10-MPEG-H-System.pdf","version_sha256":"239b82cf49b3df91749503c87b2bf50ce117f6554c660975aaa707b425388136"},{"locator":"Apple WWDC25 session 403 transcript (ASAF/APAC passage); AOMedia IAMF index.bs at 55683fae (abstract and headphone rendering fields); 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