6fa6564be8
The structure is exact. In all five resupply banks the first RIFF sits at HEADERLESS_DATA_OFFSET + n*2048, where 1392 is a constant this crate already had and 2048 is the XMA1 packet size: n = 8, 1, 7, 22, 29. No free parameter to tune, and the raw bytes agree -- high entropy from offset 0, then a zero run immediately before the RIFF. VOICE_D_451 is the control, its single packet being all zeros. So I made the obvious fix, emitting that region as a sub-wave, and then withdrew it on two measurements: * It does not recover audio. Coverage went 5.4% -> 89.9% for VOICE_D_453, but the emitted stream decodes through FFmpeg to 1792 PCM bytes -- silence -- while the RIFF sub-waves from the same banks decode to 150-270 KB. Byte coverage was the wrong success metric and it looked like progress. * It is not narrow. The rule matches 1524 of the 8021 RIFF-bearing entries in sound.pak, including RT* movie banks that decode correctly today. Landing it would have risked a wide regression in order to not-fix five banks. to_xma_riffs is back to its previous behaviour, verified by re-measuring: coverage is 5.4% / 9.7% again. The refuted attempt is recorded in the code beside the branch it would have changed, so the next person does not re-derive the arithmetic and re-make the change. XMA1_PACKET is kept as a named constant because the blast-radius scan uses it. Artifacts: examples/voice_bank_shape.rs (structure), voice_bank_dump.rs (sub-waves for decoding), slb_hybrid_scan.rs (the 1524 count). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01PMRJjbxLqZtsb5Vb7KunPE
20 lines
860 B
Rust
20 lines
860 B
Rust
//! Dump each resupply voice bank's sub-waves to `.xma` RIFFs for decoding.
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use sylpheed_formats::{slb, PakArchive};
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fn main() {
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let disc = std::env::var("SYLPHEED_DISC").expect("set SYLPHEED_DISC");
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let out = std::env::var("OUT_DIR_X").unwrap_or_else(|_| "/tmp/voicebanks".into());
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std::fs::create_dir_all(&out).unwrap();
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let snd = PakArchive::open(format!("{disc}/dat/sound.pak")).expect("sound.pak");
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for n in 450..=454 {
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let path = format!("eng\\etc\\VOICE_D_{n}.slb");
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let Some(entry) = snd.find_by_name(&path) else { continue };
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let bytes = snd.read(entry).expect("read");
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for (i, r) in slb::to_xma_riffs(&bytes).iter().enumerate() {
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let f = format!("{out}/VOICE_D_{n}_{i}.xma");
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std::fs::write(&f, r).unwrap();
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println!("{f} {} bytes", r.len());
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}
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}
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}
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