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chain_9_19: add IIR4 generator (FUN_180533340) + integrate in audio path

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- Add generate_iir4_coefs() — frequency-dependent warp coefficients from BLOCKMAP:135-150
- Integrate chain_9_19 in process_band_structural via RT_CASC=1 env gate
- chain_9_19 now runs full pipeline: LOG#1→DIVIDE→dc40→FMA→EXP#1→track→warp→LOG#2→IIR4×2→FIR→EXP#2
- IIR4×2 uses double precision (movsd/mulsd per disasm)
- FIR min-phase (52b3cd) enabled
- Canon bridge 1.594 unchanged when RT_CASC=0
- Requires live-dump or ph*.npz capture for input format calibration
This commit is contained in:
Matiq
2026-09-02 18:25:14 +03:00
parent 2a295af6f3
commit 96816f9921
3 changed files with 34 additions and 29 deletions
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dsp/framed_model.cpp
+11 -27
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@@ -409,43 +409,27 @@ static void process_band_structural(
}
// RT_CASC=1: chain_9_19 structural path (BLOCKMAP:620-644)
// Replaces warp + IIR3 with calibrated chain including IIR4×2 + FIR min-phase
// Input: raw_level (am/res*scale, 0-17.6 mean=0.048 for VLAW)
// Output: mask (0-1) in band_level
static const int casc = getenv("RT_CASC") ? atoi(getenv("RT_CASC")) : 0;
if (casc && track) {
// f6f8 is the blend buffer (step 9b accumulation)
// band_level is the per-band curve (VLAW or LUT output)
// track (from FramedDetector::track_[b]) holds persistent ACC state
fn529fe0::chain_9_19(band_level.data(), f6f8.data(), track,
fn529fe0::chain_9_19(raw_level.data(), f6f8.data(), track,
nullptr, kWarp, kRTAtt, kRTRel, nbin);
for (size_t k = 0; k < nbin; k++) band_level[k] = raw_level[k];
}
static const int firpower = getenv("RT_FIRPOWER") ? atoi(getenv("RT_FIRPOWER")) : 0;
for (size_t k = 0; k < nfft; k++) {
double mm;
// RT_FIRPOWER=1: FIR-style mask from raw spectrum.
// Plugin's actual pipeline (52b550-52b8bb):
// 1. scratch = log(raw_spectrum)
// 2. FIR = exp(0.984 × scratch) = raw^0.984
// 3. FIR *= hann_window (freq-domain)
// 4. FIR *= 0x540888 (scalar)
// 5. FIR applied via time-domain convolution (not pointwise multiply)
//
// For our structural chain (pointwise mask):
// mask = raw^0.984 × hann × 0x540888
// where hann rises from 0→1 (DC→Nyquist)
static const int firpower = getenv("RT_FIRPOWER") ? atoi(getenv("RT_FIRPOWER")) : 0;
if (vlaw) {
size_t idx = (k < nbin) ? k : nfft - 1 - k;
if (casc && track) {
mm = static_cast<double>(band_level[idx]);
} else if (vlaw) {
mm = static_cast<double>(band_level[k]);
// Signal spectral.cpp that power law is already applied (skip in FIRCONV=3)
if (firconv3 == 3) {
setenv("RT_FIRCONV3_APPLIED", "1", 1);
}
if (firconv3 == 3) setenv("RT_FIRCONV3_APPLIED", "1", 1);
} else if (firpower) {
double raw = static_cast<double>(raw_level[k]);
if (raw > 1e-12) {
mm = std::pow(raw, 0.984);
} else {
mm = 1.0;
}
mm = (raw > 1e-12) ? std::pow(raw, 0.984) : 1.0;
} else {
mm = std::exp2(-static_cast<double>(band_level[k]));
static const int noblend = getenv("RT_NOBLEND") ? atoi(getenv("RT_NOBLEND")) : 0;