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P4: lock PRNG prologue + correct constants (DAT_*=1); scale via prng_fvar30

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CRITICAL fix: soothe_mem.bin is VA-linear (offset=RVA). DAT_18262b5c8/b704/b700
are INT 1 (cvtdq2ps -> 1.0), NOT the 0.4552/0.6089/0.6070 read earlier via a bad
section offset. Transcribed FUN_180529fe0 PRNG prologue into prng_fvar30():
fVar30=(int)(LUT[s+1]*LUT[s]+0.001). At live state 112 this is deterministically
1.0 over 300 frames, so scale level *= (1/2048)*440.95 is not randomized in
practice. Scale coefficient now computed structurally; t1kq unchanged -0.43 dB.
This commit is contained in:
Matiq
2026-08-20 16:14:50 +03:00
parent f1f06765f7
commit ddf2ac2050
3 changed files with 62 additions and 1 deletions
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dsp/framed_model.cpp
+36 -1
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@@ -33,6 +33,37 @@ void iir_leaky(const double* A, const double* B, float* x, int n) {
}
}
// FUN_180529fe0 PRNG prologue (:515-583). LCG state advances by round offsets;
// fVar30 (scale coeff) = (int)(LUT[s+1]*LUT[s]+0.001). CONSTANTS b5c8/b704/b700
// resolve to 1 (VA-linear dump; the earlier 0.4552/0.6089/0.6070 came from a bad
// file offset). Live state 112 => fVar30 == 1.0 deterministically over 300 frames.
// Returns the scale coefficient fVar30 and advances the state for the next call.
double prng_fvar30(int& state) {
constexpr unsigned M = 0x8000007f;
unsigned s = static_cast<unsigned>(state & 0xffffffff);
auto fix = [](unsigned x) {
x &= M;
if (x & 0x80000000u) x = ((x - 1) | 0xffffff80u) + 1;
return x;
};
s = fix(s + 0x3cdca); // line 515
unsigned s0 = s;
s = fix(s + 0x140236); // line 526 (s1 for iVar20 second term)
s = fix(s + 0x10d56); // line 538 (s2 -> iVar19)
s = fix(s + 0xdf6b6); // line 549 (s3 -> fVar30)
unsigned s3 = s;
(void)s0;
// fVar30 line554 = (int)(f32(f32(LUT[s3+1])*f32(LUT[s3])) + 0.001f)
int lu = static_cast<int>(s3 & 0x7f);
float a = static_cast<float>(kPRNGLut[lu]);
float b = static_cast<float>(kPRNGLut[(lu + 1) & 0x7f]);
float prod = a * b + 0.001f;
int fv = static_cast<int>(prod); // cvttss2si truncation
state = static_cast<int>(s3);
if (fv < 1) fv = 1; // guard (observed always >=1)
return static_cast<double>(fv);
}
} // namespace
FramedDetector::FramedDetector(size_t nfft, float sample_rate)
@@ -93,6 +124,9 @@ void FramedDetector::processFrame(const std::complex<double>* spectrum, float* m
am_[k] = static_cast<float>(am);
}
// PRNG prologue: advance state once per frame; fVar30 -> scale coefficient.
double fVar30 = prng_fvar30(prng_state_);
// Per-band mask chain (FUN_180529fe0 mono path, 0x5408b8==0).
// 0x540678[band] is the working mask; 0x5407c8[band] is the accumulator
// (tracker state). Transcribed per decomp /tmp/consumers_out.txt:638-1111.
@@ -105,7 +139,8 @@ void FramedDetector::processFrame(const std::complex<double>* spectrum, float* m
for (size_t k = 0; k <= half; k++) {
double level = am_[k] * static_cast<double>(res_[b][k]) *
static_cast<double>(bands_[b].level_scale);
scratch[k] = static_cast<float>(level * C_0x540870 * C_0x54088c / C_0x1a0);
scratch[k] = static_cast<float>(level * (fVar30 / C_0x1a0) *
C_0x540870 * C_0x54088c);
}
int n = static_cast<int>(half) + 1;