KHR_audio_emitter: channel rule, default listener, scale rule, Opus, loopCount, linear-model validation, playing pointer - #5
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…odec, loopCount, linear-model validation, playing pointer Implementation-informed changes from the layered-architecture work (KhronosGroup#2561), matching the review posted on KhronosGroup#2137: - normative channel behavior: positional emitters down-mix to mono per Web Audio mixing rules; global emitters play channels as authored - default listener defined (active camera / viewer pose; extensions may override) - node-scale rule adopted from KHR_lights_punctual (scale does not affect gain/attenuation; distances are world-space) - audio/ogg (Ogg Opus, RFC 7845) added as second base mimeType: MP3 cannot loop gaplessly, Opus can (+ multichannel) - loopCount (0 = infinite) on sources - linear distance model now requires explicit maxDistance > refDistance (default 0 sentinel divided by zero) - runtime-only 'playing' Object Model pointer for event-driven playback via KHR_interactivity / KHR_animation_pointer (rising edge restarts, false stops; demonstrated in the playable drum-kit asset linked from KhronosGroup#2561) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Concrete spec text for the feedback posted on KhronosGroup#2137 (comment), offered as a PR into this branch so it flows into the upstream PR if accepted. Every change is implementation-tested (Web Audio reference runtime + WebGPU viewer + a playable demo asset; links in KhronosGroup#2561). README + 2 schema files; no restructuring.
audio/ogg(Ogg Opus, RFC 7845) alongsideaudio/mpeg. MP3 encoder padding makes gapless loops impossible (acknowledged in the upstream thread); loop-intended audio SHOULD use Opus. Schema updated.loopCount(integer,0= infinite) on sources — matches Omniverse and engine baseline. Schema updated.distanceModel: "linear"now requires explicitmaxDistance > refDistance(the defaultmaxDistance: 0sentinel makes the linear formula divide by a negative).playingObject Model pointer — the smallest possible answer to the open event-driven-playback question: writingtrue(re)starts the source on every referencing emitter (rising edge restarts),falsestops, read = is-playing. Not serialized; exists only through the Object Model for KHR_interactivity / KHR_animation_pointer. This single pointer is what makes a playable-instrument asset expressible today — working demo (drum kit, ~180 KB) linked from Proposal: Layered Audio Extension Architecture — KHR_audio_emitter + KHR_audio_graph + KHR_audio_environment KhronosGroup/glTF#2561. If the WG prefers dedicated interactivity audio nodes instead, this item can be dropped independently of the rest.🤖 Generated with Claude Code
https://claude.ai/code/session_01GrRJ9hLK9L9HK5ZsJjNdw7