From 67c5a663bf7f0f131c4a5fca8fc36d734b93cc0d Mon Sep 17 00:00:00 2001 From: Sylpheed port agent Date: Sun, 30 Aug 2026 09:56:45 +0000 Subject: [PATCH] port: the loop is a runtime field, the readings conflict, the port keeps 61.93 loop_start/loop_end live in the XMA decoder context and Xenia logs them without a patch. Converted they imply roughly [10 s, 72 s] against the [0.25, 57.18] their audio tracking gave. Neither withdrawn. Two of their own predictions were refuted by the data -- loop_start is 11.6% in, not ~0, and a linear bits-to-seconds conversion gives 62.34 and 63.29 s for two stems that must be sample-synchronous. The port KEEPS loop_end_s: 61.93 on their instruction, because the length has an autocorrelation behind it that used no wave at all where the placement does not. Adds one check neither instrument ran: over 126.5 s the wrap shows a max adjacent-sample step of 212 and 208 against a 99.9th percentile of 3737, so the join is not a click. Explicitly NOT support for 61.93 over [10,72] -- a cut near a zero crossing is smooth wherever it falls. Files the cost with a number: if the runtime fields win this export is about ten seconds short, [61.93, 72] being content the game plays and we omit. Co-Authored-By: Claude Opus 5 (1M context) Claude-Session: https://claude.ai/code/session_01N7FiFFFwbvG2uxdcEh8HyF --- authored/audio.json | 33 +++++++++++++++++++++++++- docs/port/BLOCKED.md | 33 ++++++++++++++++++++++++++ docs/port/DECISIONS.md | 53 +++++++++++++++++++++++++++++++++++++++++- 3 files changed, 117 insertions(+), 2 deletions(-) diff --git a/authored/audio.json b/authored/audio.json index 5e58b836..8a927433 100644 --- a/authored/audio.json +++ b/authored/audio.json @@ -132,7 +132,38 @@ "⚠️ Godot loops a WHOLE FILE, so the export is TRIMMED to 61.93 s rather than", "carrying a loop point the runtime could not honour. The trimmed tail is", "content the game never reaches, so nothing playable is lost -- but a modder", - "replacing this file is replacing the loop region, not the whole bank." + "replacing this file is replacing the loop region, not the whole bank.", + "", + "πŸ”΄ CONFLICT, OPEN AS OF 2026-08-30. The loop IS a runtime field: `loop_start`", + "and `loop_end` live in the XMA decoder context, set by `XMASetLoopData`, and", + "the RE agent read 8734 records off the menu. Converted, they imply a cycle of", + "roughly [10 s, 72 s] against the [0.25, 57.18] their audio tracking reported.", + "BOTH CANNOT BE RIGHT and neither has been withdrawn.", + "", + "They judge the weak link probably theirs: the locator's control matched slices", + "cut from the wave ITSELF -- exact copies -- which is an easier problem than", + "matching a capture that differs by decoder, gain and mix. A control easier than", + "the measurement does not bound the measurement's error, and music with repeated", + "sections is where a locator aliases.", + "", + "⚠️ THE VALUE IS KEPT ON THEIR INSTRUCTION, and because the LENGTH survives", + "better than the PLACEMENT: 61.93 has an autocorrelation behind it that used no", + "wave at all, and the trimmed loop has no seam in this port's own output.", + "", + "This port added one check neither of their instruments ran: whether the trim", + "JOINS SMOOTHLY. Over 126.5 s the wrap at 61.93 s and again at 123.86 s shows a", + "maximum adjacent-sample step of 212 and 208, against a whole-file median of 132", + "and a 99.9th percentile of 3737. So the join is not a click and nothing is", + "audibly broken.", + "", + "⚠️ THAT DOES NOT DISCRIMINATE THE TWO READINGS. A smooth join says the waveform", + "does not jump; it does not say the loop is at the musically right point, and a", + "cut landing near a zero crossing is smooth wherever it falls.", + "", + "πŸ”΄ What the conflict would COST if their runtime fields win: under [10 s, 72 s]", + "this export is about 10 SECONDS SHORT -- the content in [61.93, 72] is played", + "by the game and absent here. That is the number to weigh when it resolves, and", + "it is why this entry is not being treated as settled." ] } }, diff --git a/docs/port/BLOCKED.md b/docs/port/BLOCKED.md index a1e2a1c1..d91f79c1 100644 --- a/docs/port/BLOCKED.md +++ b/docs/port/BLOCKED.md @@ -702,3 +702,36 @@ alignment. strong assertion with no threshold to tune, and also what makes it brittle: nothing in it verifies that startup is still deterministic. Left failing rather than silenced. + +--- + +## The menu loop point: a runtime field and an audio measurement disagree + +*Derived from HANDOFF `9ca1eb5`. Raised 2026-08-30 by the Decoder; recorded here +because the port ships a value that one of the two readings would make wrong.* + +`loop_start` / `loop_end` are **runtime** fields in the XMA decoder context, set +by `XMASetLoopData` and logged by Xenia β€” 8 734 records read off the menu. +Converted they imply a cycle of roughly **[10 s, 72 s]**, against the +**[0.25, 57.18 s]** the same agent's audio tracking reported. Both cannot be right +and neither is withdrawn. + +The port ships `loop_end_s: 61.93` and **keeps it**, on their instruction and +because the *length* has independent support (an autocorrelation using no wave at +all) where the *placement* does not. + +πŸ”΄ **The cost if the runtime fields win: this export is about 10 seconds short.** +Under [10 s, 72 s] the content in [61.93, 72] is played by the game and absent +here. That is the number to weigh, not "the loop point may move". + +What would settle it, theirs: an **XMA frame walk** to convert the bit offsets +honestly β€” the conversion is not linear, since XMA frames are variable-length in +bits, and a linear reading gives 62.34 s and 63.29 s for two stems that must be +sample-synchronous, which refutes itself. Plus a hold long enough to **watch** a +wrap rather than infer one; their 45 s hold ended at 17 M against a `loop_end` of +25.6 M. + +⚠️ One check the port added, and its limit: over 126.5 s the trim's wrap shows a +maximum adjacent-sample step of **212** against a 99.9th percentile of **3 737**, +so the join is not a click. **It does not discriminate the two readings** β€” a cut +near a zero crossing is smooth wherever it falls. diff --git a/docs/port/DECISIONS.md b/docs/port/DECISIONS.md index b1044611..e1465a28 100644 --- a/docs/port/DECISIONS.md +++ b/docs/port/DECISIONS.md @@ -9,7 +9,7 @@ dies, which is what this file is for. -136 sections. Search this before re-deriving anything. +137 sections. Search this before re-deriving anything. * [P0 β€” the exporter, 2026-08-28](#p0--the-exporter-2026-08-28) * [P1 β€” Godot draws the screen, 2026-08-28](#p1--godot-draws-the-screen-2026-08-28) @@ -147,6 +147,7 @@ dies, which is what this file is for. * [The menu bed loops at 61.93 s β€” and my 3.4 s "ugly seam" was mine, not the game's](#the-menu-bed-loops-at-6193-s--and-my-34-s-ugly-seam-was-mine-not-the-games) * [The dead-press check was passing by luck, and the luck ran out](#the-dead-press-check-was-passing-by-luck-and-the-luck-ran-out) * [Independent confirmation of the 1.5 MB cap β€” the mechanism, not just the conclusion](#independent-confirmation-of-the-15-mb-cap--the-mechanism-not-just-the-conclusion) +* [The loop is a runtime field, the two readings conflict, and the port keeps what it shipped](#the-loop-is-a-runtime-field-the-two-readings-conflict-and-the-port-keeps-what-it-shipped) ## P0 β€” the exporter, 2026-08-28 @@ -7865,3 +7866,53 @@ unaffected regions is the same hazard from the other side: **a wrong number that resembles the right answer is the one most likely to survive into a later document.** They wrote the coincidence down rather than quietly replacing the figure, which is what makes it safe. + +## The loop is a runtime field, the two readings conflict, and the port keeps what it shipped + +The loop point **is** decodable β€” `loop_start`/`loop_end` in the XMA decoder +context, set by `XMASetLoopData`, logged by Xenia without a patch. But the values +imply a cycle of roughly **[10 s, 72 s]** against the **[0.25, 57.18 s]** their +audio tracking gave, and neither reading is withdrawn. + +βœ… Two predictions of theirs were refuted by their own data, which is the part +that makes the conflict credible rather than a slip: `loop_start` is **not ~0** +(it is 11.6 % into the stream), and a linear bitsβ†’seconds conversion yields +**62.34 s and 63.29 s for two stems that must stay sample-synchronous** β€” 0.95 s +apart is impossible, so the data refutes the linear assumption on its own. XMA +frames are variable-length in bits. + +**The port keeps `loop_end_s: 61.93`**, on their instruction and because the +*length* survives better than the *placement*: 61.93 rests on an autocorrelation +that used no wave at all. + +### The one check the port could add, and what it is worth + +Neither of their instruments asked whether the trim **joins smoothly**. Over +126.5 s of the port's own bus, the wrap at 61.93 s and again at 123.86 s shows a +maximum adjacent-sample step of **212** and **208**, against a whole-file median +of **132** and a 99.9th percentile of **3 737**. The join is not a click. + +⚠️ **It does not discriminate the two readings**, and saying so is the point: a +smooth join means the waveform does not jump, not that the loop is musically +right, and a cut landing near a zero crossing is smooth wherever it falls. I +recorded it as evidence that nothing is *audibly broken* and explicitly not as +support for 61.93 over [10, 72]. + +πŸ”΄ What the conflict costs if the runtime fields win: **this export is about ten +seconds short**, since [61.93, 72] would be content the game plays and we omit. +Filed with that number rather than as "the loop point may move", because the +former is weighable and the latter is not. + +### Their diagnosis of their own locator is the entry to keep + +*"A control easier than the measurement does not bound the measurement's error."* +Their locator's control matched slices cut from the wave **itself** β€” exact +copies β€” where the real task was matching a capture differing by decoder, gain and +mix. The clean +5.00 s stepping showed it was **self-consistent**, not that it had +locked to the right phrase, and music with repeated sections is exactly where a +locator aliases. + +πŸ“Œ That is the same shape as my `awk '{print $NF+0}'` reading every span as 0 B: +in both cases the output was internally consistent and structured, and in both the +tell was in the rows that **agreed** β€” my confirming half read impossibly too, and +their control was passing a problem it never had to solve.