0fee18d1b8
Finishing the step I left open last iteration rather than starting something new. Offsets and packet counts were in hand; what was missing was proof they are actually waves. slb_extract_wave.py wraps a (bank, offset, packets, channels, rate) slice in a synthesized XMA1 RIFF, following the layout the Rust decoder already uses. The three located cues decode to 0.533 s, 0.344 s and 1.016 s of mono 48 kHz audio, audible from sample 0, each with the percussive attack-and-decay envelope of a UI blip. Bitrates come out at 12-15 kB/s, about half the stereo BGM rate, which is what mono should be. The control matters more than the results. The SAME wrapper applied to BGM_001's first wave decodes to 173.808875 s -- identical to the duration that bank's own on-disc RIFF header produced back when Q10 was answered. So the header I synthesized is not approximately right, it reproduces a known-good decode exactly, and the cue durations are trustworthy for the same reason. I did not commit the decoded audio. Three commands regenerate it from the disc, and the corpus's job is measurements and tooling rather than extracted game assets. The offsets, the packet counts and the tool are the deliverable.
32 lines
1.7 KiB
Plaintext
32 lines
1.7 KiB
Plaintext
SE cue waves located inside Static.slb by playing them.
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Method: run Canary with --xma_param_probe=true, drive the main menu, and read the
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per-stream XMA-PARAM lines. Each line carries the stream's first 32 bytes; those
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bytes are then searched for in Static.slb's 8 353 472 readable bytes.
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event packets bytes channels/rate offset in Static.slb
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------------------------- ------- ------ -------------- --------------------
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d-pad move (cursor) 4 8192 mono 48000 Hz 0x1ec0
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B / back (cancel) 2 4096 mono 48000 Hz 0x0ec0
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(played before any input) 6 12288 mono 48000 Hz 0x5d6c0
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Each head matched at exactly ONE offset. The first two are contiguous:
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0x0ec0 + 4096 = 0x1ec0.
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Simultaneously at the main menu, two STEREO 48 kHz streams were decoding:
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1893 packets / 3 876 864 B and 1919 packets / 3 930 112 B. See
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structures/bgm-two-stems.md -- this is the runtime observation that the two
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stems of a music bank play at the same time.
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DECODED 2026-08-28 with tools/re-capture/slb_extract_wave.py + ffmpeg's xma1:
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event offset packets decoded rms peak envelope shape
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---------------- -------- ------- --------- ----- ----- ------------------------
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d-pad move 0x1ec0 4 0.533 s 2085 29813 sharp attack, monotonic decay
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B / back 0x0ec0 2 0.344 s 2985 16973 attack, peak in frame 2
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(pre-input cue) 0x5d6c0 6 1.016 s 4327 32767 peaks in frame 3, long decay
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CONTROL: the same synthesized RIFF wrapper applied to BGM_001.slb's first wave
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(offset 14336, stereo) decodes to 173.808875 s -- identical to the duration
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obtained from that bank's own on-disc RIFF header. The wrapper is correct.
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