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ace step optimizations

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Concedo 2026-03-15 20:58:45 +08:00
parent ccd4745e0c
commit 2093ca4c73
4 changed files with 184 additions and 62 deletions
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35
otherarch/utils.cpp
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@ -418,11 +418,30 @@ std::vector<float> resample_wav(int num_channels,const std::vector<float>& input
std::vector<float> output((size_t)n_out * num_channels);
const int half_len = 32;
const int taps = half_len * 2;
const double beta = 9.0;
const double inv_i0b = 1.0 / audio_resample_bessel_i0(beta);
const double fc = 0.5 * ((ratio < 1.0) ? ratio : 1.0);
// PRECOMPUTE KAISER WINDOW
std::vector<double> window(taps + 1);
for (int k = -half_len; k <= half_len; k++)
{
double t = (double)k / (double)half_len;
double win;
if (t < -1.0 || t > 1.0)
win = 0.0;
else
win = audio_resample_bessel_i0(beta * std::sqrt(1.0 - t * t)) * inv_i0b;
window[k + half_len] = win;
}
for (int ch = 0; ch < num_channels; ch++)
{
const float* src = input.data() + ch * n_in;
@ -432,8 +451,10 @@ std::vector<float> resample_wav(int num_channels,const std::vector<float>& input
{
double center = (double)i / ratio;
int start = (int)std::floor(center) - half_len + 1;
int end = (int)std::floor(center) + half_len;
int base = (int)std::floor(center);
int start = base - half_len + 1;
int end = base + half_len;
double sum = 0.0;
double wgt = 0.0;
@ -443,22 +464,18 @@ std::vector<float> resample_wav(int num_channels,const std::vector<float>& input
double d = center - (double)j;
double sinc_val;
if (std::fabs(d) < 1e-9)
sinc_val = 2.0 * fc;
else
sinc_val = std::sin(2.0 * M_PI * fc * d) / (M_PI * d);
double t = d / (double)half_len;
double win;
if (t < -1.0 || t > 1.0)
win = 0.0;
else
win = audio_resample_bessel_i0(beta * std::sqrt(1.0 - t * t)) * inv_i0b;
double win = window[j - start];
double h = sinc_val * win;
int idx = j;
if (idx < 0) idx = 0;
if (idx >= n_in) idx = n_in - 1;