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All/most spectral processing stages now in stand alone functions

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xenakios 2017-12-03 19:09:42 +02:00
parent 4a2cc8ff71
commit a1f7c52eb0
1 changed files with 103 additions and 0 deletions
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103
Source/PS_Source/ProcessedStretch.h
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@ -188,6 +188,109 @@ inline REALTYPE profile(REALTYPE fi, REALTYPE bwi) {
};
inline void spectrum_spread(int nfreq, double samplerate,
std::vector<REALTYPE>& tmpfreq1,
REALTYPE *freq1, REALTYPE *freq2, REALTYPE spread_bandwidth) {
//convert to log spectrum
REALTYPE minfreq = 20.0f;
REALTYPE maxfreq = 0.5f*samplerate;
REALTYPE log_minfreq = log(minfreq);
REALTYPE log_maxfreq = log(maxfreq);
for (int i = 0; i<nfreq; i++) {
REALTYPE freqx = i / (REALTYPE)nfreq;
REALTYPE x = exp(log_minfreq + freqx * (log_maxfreq - log_minfreq)) / maxfreq * nfreq;
REALTYPE y = 0.0f;
int x0 = (int)floor(x); if (x0 >= nfreq) x0 = nfreq - 1;
int x1 = x0 + 1; if (x1 >= nfreq) x1 = nfreq - 1;
REALTYPE xp = x - x0;
if (x<nfreq) {
y = freq1[x0] * (1.0f - xp) + freq1[x1] * xp;
};
tmpfreq1[i] = y;
};
//increase the bandwidth of each harmonic (by smoothing the log spectrum)
int n = 2;
REALTYPE bandwidth = spread_bandwidth;
REALTYPE a = 1.0f - pow(2.0f, -bandwidth * bandwidth*10.0f);
a = pow(a, 8192.0f / nfreq * n);
for (int k = 0; k<n; k++) {
tmpfreq1[0] = 0.0f;
for (int i = 1; i<nfreq; i++) {
tmpfreq1[i] = tmpfreq1[i - 1] * a + tmpfreq1[i] * (1.0f - a);
};
tmpfreq1[nfreq - 1] = 0.0f;
for (int i = nfreq - 2; i>0; i--) {
tmpfreq1[i] = tmpfreq1[i + 1] * a + tmpfreq1[i] * (1.0f - a);
};
};
freq2[0] = 0;
REALTYPE log_maxfreq_d_minfreq = log(maxfreq / minfreq);
for (int i = 1; i<nfreq; i++) {
REALTYPE freqx = i / (REALTYPE)nfreq;
REALTYPE x = log((freqx*maxfreq) / minfreq) / log_maxfreq_d_minfreq * nfreq;
REALTYPE y = 0.0;
if ((x>0.0) && (x<nfreq)) {
int x0 = (int)floor(x); if (x0 >= nfreq) x0 = nfreq - 1;
int x1 = x0 + 1; if (x1 >= nfreq) x1 = nfreq - 1;
REALTYPE xp = x - x0;
y = tmpfreq1[x0] * (1.0f - xp) + tmpfreq1[x1] * xp;
};
freq2[i] = y;
};
};
inline void spectrum_do_compressor(ProcessParameters& pars, int nfreq, REALTYPE *freq1, REALTYPE *freq2) {
REALTYPE rms = 0.0;
for (int i = 0; i<nfreq; i++) rms += freq1[i] * freq1[i];
rms = sqrt(rms / nfreq)*0.1f;
if (rms<1e-3f) rms = 1e-3f;
REALTYPE _rap = pow(rms, -pars.compressor.power);
for (int i = 0; i<nfreq; i++) freq2[i] = freq1[i] * _rap;
};
inline void spectrum_do_tonal_vs_noise(ProcessParameters& pars, int nfreq, double samplerate,
std::vector<REALTYPE>& tmpfreq1,
REALTYPE *freq1, REALTYPE *freq2) {
spectrum_spread(nfreq, samplerate, tmpfreq1, freq1, tmpfreq1.data(), pars.tonal_vs_noise.bandwidth);
if (pars.tonal_vs_noise.preserve >= 0.0) {
REALTYPE mul = (pow(10.0f, pars.tonal_vs_noise.preserve) - 1.0f);
for (int i = 0; i<nfreq; i++) {
REALTYPE x = freq1[i];
REALTYPE smooth_x = tmpfreq1[i] + 1e-6f;
REALTYPE result = 0.0f;
result = x - smooth_x * mul;
if (result<0.0f) result = 0.0f;
freq2[i] = result;
};
}
else {
REALTYPE mul = (pow(5.0f, 1.0f + pars.tonal_vs_noise.preserve) - 1.0f);
for (int i = 0; i<nfreq; i++) {
REALTYPE x = freq1[i];
REALTYPE smooth_x = tmpfreq1[i] + 1e-6f;
REALTYPE result = 0.0f;
result = x - smooth_x * mul + 0.1f*mul;
if (result<0.0f) result = x;
else result = 0.0f;
freq2[i] = result;
};
};
};
inline void spectrum_do_harmonics(ProcessParameters& pars, std::vector<REALTYPE>& tmpfreq1, int nfreq, double samplerate, REALTYPE *freq1, REALTYPE *freq2) {
REALTYPE freq = pars.harmonics.freq;
REALTYPE bandwidth = pars.harmonics.bandwidth;