runtime capture: registry heartbeat decodes live DSP tables (WIN 0.540658, freq-axis@48k, per-bin weights), rtsnap_fast/findctx/rtchunk infra

2026-08-19 20:06:14 +03:00
parent 8fdb1dc082
commit abf09a26cc
13 changed files with 251 additions and 36 deletions
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+# RUNTIME CAPTURE — LIVE DSP TABLES (2026-08-19)
+
+## BREAKTHROUGH: heap "registry" object found & read during offline render
+- During `reaper -nosplash -renderproject render_long.rpp`, the yabridge-host
+  allocates a DSP arena containing a **registry array**: a run of `{u64 count, u64 ptr}`
+  pairs (stride 0x10) pointing at every DSP buffer. At capture time:
+  registry base = **0x29b06c0** (in anon region 0x2922000, 0x77e000).
+  (GUI-session registry was 0x28b06c0 — same object, shifted by arena layout.)
+- Finding it live: scan host-readable memory (chunked, 8MB) for `u64==8193` (0x2001)
+  followed by a readable ptr, then require a run of count/ptr pairs at stride 0x10.
+- Registry owner chain: 0 hits for a u64==registry address, so it is reached
+  structurally (object member at some fixed offset), not via an explicit global.
+
+## Captured tables (SR=44100 project, but internal freq-axis = 48000!)
+| reg idx | count | ptr      | content |
+|---------|-------|----------|---------|
+| [00] | 8193 | 0x2a72600 | identity ~1.0 |
+| [01] | 8193 | 0x2111140 | **WIN_freq: 0.5 -> 1.0 (saturates; idx1024=0.68, idx2048=0.8)** — the FFT-conv window (0x540658) |
+| [02] | 8193 | 0x29f2280 | 0 -> ~0.01 (levels/curve) |
+| [03] | 8193 | 0x29fa300 | **0.596 -> 0.126** = matches known rwin_C0 |
+| [04] | 8193 | 0x2a02340 | **0.404 -> 0.874** = 1-[03] complement |
+| [05] | 8193 | 0x2a0a3c0 | 0.0435 -> ~0 (weight, small) |
+| [06] | 8193 | 0x2a12400 | 0.9565 -> ~1.0 (1-[05]) |
+| [07] | 8193 | 0x2aca740 | zeros + small negatives |
+| [0d] | 2049 | 0x2cd0fc0 | **freq-axis 0..23988.3 Hz, spacing 11.713 = 48000/4096** → internal SR=48000 |
+| [0e] | 8193 | 0x2cd9000 | 2.017 -> 0 (LUT/knee?) |
+| [0f] | 16384 | 0x2ce9080 | same as [0e] doubled |
+| [10] | 16384 | 0x2cf90c0 | 1.2914 -> 0 |
+| [12] | 16384 | 0x2a62540 | 11.29.. (scattering) |
+| [14]/[15] | 8193 | .. | first-fire IR? 0,0.022,0.104,0.084,0.018,0 |
+| [17] | 32768 | 0x2d29140 | 0.9999 -> ~1 (ramp) |
+| [19] | 32768 | 0x2d69200 | 1.2915 -> 1.0 |
+| others | 32768/65536 | .. | ones / ramps (FFT plans, mirrors) |
+
+- Key numeric check: registry[03] head 0.5960761, idx1024 0.168, idx2048 0.1257 —
+  byte-identical to earlier GUI rwin_C0 (0.596 -> 0.126). Confirms registry IS the
+  authoritative per-bin weight source; tables are stable across sessions/SR.
+- **FREQ-AXIS uses internal SR=48000 regardless of project 44100** (spacing 11.713).
+  This reconciles "rwin tables at 48k" even when rendering 44.1k projects.
+
+## Files saved (handoff/)
+- `rtwin_freq_44100.npy` — WIN_freq (8193 f32): 0.5 -> 1.0 (this is live 0x540658 window)
+- `rtfreqaxis_48000_internal.npy` — freq-axis (2048 f32, 0..23988.3, spacing 11.713)
+- `rtwa_596.npy` — [03] 0.596->0.126
+- `rtwb_404.npy` — [04] 0.404->0.874
+- `rtwc_043.npy` — [05]
+- `rtwd_956.npy` — [06]
+- Full raw snapshot: /tmp/snap_all.bin (318MB, entries {lo,sz,bytes}), registry.txt list.
+
+## Method notes (repro)
+- rtsnap_fast.py: spawn reaper render_long, find host (soothe2 in maps, not reaper),
+  sleep 6s (tables built), pread ALL readable maps chunked 8MB -> snap_all.bin.
+- pread of large anon regions can EIO -> MUST chunk (8MB); whole-region pread loses data.
+- Scan ~0.1s for 318MB once chunked; far cheaper than object-base scan.
+- Earlier vptr-based (rtobj/rtdump2/rtall) and 44100-marker scans all failed because
+  the DSP object has NO static vptr match in a fresh render (host dies / fields live
+  only during audio) and ctor field +0x24 != 44100 live. The registry run is the
+  reliable beacon.
+
+## Remaining (for twin IIR attack/release per-bin)
+- twin state A/B (342 double per-bin IIR states) still not uniquely located live;
+  short renders keep them ~0. They are NOT the registry tables.
+- Next: render_long + capture at t=10-20s into sustain, then locate the per-bin
+  attack/release smoothing coefficients (0x540888/88c set, converted via ln(10)/20)
+  inside the arena near registry.