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port: add Q10 -- what a music bank's sub-waves actually are
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BGM_001.slb is three sub-waves (10 KB, 4.47 MB, 4.67 MB) and the decoder
concatenates them into one 347 s track. That is a default nobody chose, not a
decision: two near-equal halves could be intro + loop, two variations, or two
halves of one piece, and a menu that loops its music needs to know which.

Found while wiring the Audio Library up to the shared banks. Recorded in
HANDOFF.md as a trap too, so the port does not build looping on top of the
concatenated track before the question is answered.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Sylpheed RE agent
2026-08-28 17:43:25 +02:00
parent 4734797e50
commit 69291a315f
4 changed files with 183 additions and 0 deletions
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6
docs/port/HANDOFF.md
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@@ -36,6 +36,7 @@ authored version can be deleted.
| Q7 | transitions | ❔ open | |
| Q8 | menu audio bindings | ❔ open | cue table complete, event binding is not |
| Q9 | video binding + playback rules | 🟡 partial | `ADV.wmv` is the boot intro; new-game intro unidentified |
| Q10 | music-bank sub-wave roles (intro+loop?) | ❔ open | we concatenate blindly today |
| S1 | Ready Room go/no-go | ❔ open | probe not run |
## Already settled — the port can rely on these today
@@ -76,6 +77,11 @@ authored version can be deleted.
reader must allow a short read there and only there.
* **Voice downmixes to mono, music does not.** The left-channel downmix is correct
for spoken lines and discards half a music mix.
* **A music bank has several sub-waves and we glue them together.** `BGM_001`
is 10 KB + 4.47 MB + 4.67 MB, concatenated into one 347 s track. Nobody has
established whether those are intro + loop, two variations, or two halves —
see Q10. Do not build menu looping on the concatenated track until it is
answered.
* **`JNGL_001.slb` does not decode.** One bank in 9 519; its payload is not a whole
number of XMA1 packets from any known data offset.

1
docs/port/MISSION.md
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@@ -74,6 +74,7 @@ alongside it.
| **Q7** | **Transitions.** What happens visually between screens — the `pteff00.prm` quads, a fade, a cut — and its timing | Described and timed against a capture |
| **Q8** | **Menu audio.** Which BGM per screen; which cue on move / confirm / back / error. The cue table is complete; the event binding is not | Cue names bound to events, with how you established each |
| **Q9** | **Video binding.** Which movie is the boot intro vs the new-game intro; whether playback is skippable and what ends it | Named movies plus the playback rules |
| **Q10** | **What are a music bank's sub-waves?** `BGM_001.slb` is three sub-waves — 10 KB, 4.47 MB, 4.67 MB — and we currently **concatenate them blindly** into one 347 s track. Two near-equal halves could be intro + loop, or two variations, or two halves of one piece. A menu that loops its music needs to know which | The role of each sub-wave, established for at least the menu BGM. "Concatenate" is a decision, not a default — right now it is a default nobody chose |
| **S1** | **Ready Room probe.** *Gated* — one iteration, then stop | A written go/no-go (see below) |
## Known unknowns — say so, do not fill them in