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open-standards/wai/changes/2026-11-09-compose-opus-floor.md
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wai-web compose: an Ogg Opus piece trimmed to its pre-skip and end 
An alternative of wai.audio.opus routed to the user agent is an Ogg Opus
stream whose pre-skip and end (RFC 7845 §4) a decoder handed its packets does
not apply. compose.js drops the OpusHead pre-skip, less what the decoder
dropped itself, ends the samples at the last page's granule position, and
holds an Opus floor's piece (packaging §7.9) to exactly its piece's samples
(compose_frames otherwise). run.mjs plays pack-conformance/multi/multi-opus-01
without FLAC: where the engine's AudioDecoder takes Opus every piece plays its
Opus floor and comes to exactly the piece's samples; an engine whose
VideoDecoder refuses that golden's 64 x 36 picture is held to refusing it at
the lead's first piece.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-11-09 16:54:46 -05:00

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The composing sink trims an Ogg Opus piece to its pre-skip and end

  • wai-web/compose/: an alternative of wai.audio.opus routed to the user agent is an Ogg Opus stream whose pre-skip and end (RFC 7845 §4) a decoder handed its packets does not apply: compose.js drops the OpusHead pre-skip (less what the decoder dropped itself), ends the samples at the last page's granule position, and holds an Opus floor's piece (packaging §7.9) to exactly its piece's samples (compose_frames otherwise). run.mjs plays pack-conformance/multi/multi-opus-01 without FLAC: where the engine's AudioDecoder takes Opus every piece plays its Opus floor and comes to exactly the piece's samples.