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spectrum_extraction_by_world.cc
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spectrum_extraction_by_world.cc
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// ------------------------------------------------------------------------ //
// Copyright 2021 SPTK Working Group //
// //
// Licensed under the Apache License, Version 2.0 (the "License"); //
// you may not use this file except in compliance with the License. //
// You may obtain a copy of the License at //
// //
// http://www.apache.org/licenses/LICENSE-2.0 //
// //
// Unless required by applicable law or agreed to in writing, software //
// distributed under the License is distributed on an "AS IS" BASIS, //
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. //
// See the License for the specific language governing permissions and //
// limitations under the License. //
// ------------------------------------------------------------------------ //
#include "SPTK/analysis/spectrum_extraction_by_world.h"
#include <cstddef> // std::size_t
#include "WORLD/world/cheaptrick.h"
#include "WORLD/world/constantnumbers.h"
#include "WORLD/world/stonemask.h"
namespace sptk {
SpectrumExtractionByWorld::SpectrumExtractionByWorld(int fft_length,
int frame_shift,
double sampling_rate)
: fft_length_(fft_length),
frame_shift_(frame_shift),
sampling_rate_(sampling_rate),
is_valid_(true) {
if (!sptk::IsPowerOfTwo(fft_length_) || fft_length <= 3 ||
frame_shift_ <= 0 || !sptk::IsInRange(sampling_rate_, 8000.0, 98000.0)) {
is_valid_ = false;
return;
}
}
bool SpectrumExtractionByWorld::Run(
const std::vector<double>& waveform, const std::vector<double>& f0,
std::vector<std::vector<double> >* spectrum) const {
// Check inputs.
if (!is_valid_ || waveform.empty() || f0.empty() || NULL == spectrum) {
return false;
}
// Check F0 values to prevent segmentation fault.
const int f0_length(static_cast<int>(f0.size()));
const double nyquist_frequency(0.5 * sampling_rate_);
for (int i(0); i < f0_length; ++i) {
if (f0[i] < 0.0 || nyquist_frequency < f0[i]) {
return false;
}
}
// Check FFT size.
double f0_floor(world::kFloorF0);
for (int i(0); i < f0_length; ++i) {
if (0.0 < f0[i] && f0[i] < f0_floor) {
f0_floor = f0[i];
}
}
if (f0_floor < world::GetF0FloorForCheapTrick(
static_cast<int>(sampling_rate_), fft_length_)) {
return false;
}
const double frame_shift_in_sec(frame_shift_ / sampling_rate_);
std::vector<double> time_axis(f0_length);
for (int i(0); i < f0_length; ++i) {
time_axis[i] = i * frame_shift_in_sec;
}
world::CheapTrickOption option;
world::InitializeCheapTrickOption(static_cast<int>(sampling_rate_), &option);
option.fft_size = fft_length_;
option.f0_floor = f0_floor;
// Prepare memories.
if (spectrum->size() != static_cast<std::size_t>(f0_length)) {
spectrum->resize(f0_length);
}
const int length(fft_length_ / 2 + 1);
for (int i(0); i < f0_length; ++i) {
if ((*spectrum)[i].size() != static_cast<std::size_t>(length)) {
(*spectrum)[i].resize(length);
}
}
std::vector<double*> pointers;
pointers.reserve(f0_length);
for (std::vector<double>& vector : *spectrum) {
pointers.push_back(vector.data());
}
// Modify F0 for pitch-adaptive spectrum estimation.
std::vector<double> modified_f0(f0_length);
world::StoneMask(waveform.data(), static_cast<int>(waveform.size()),
static_cast<int>(sampling_rate_), time_axis.data(),
f0.data(), f0_length, modified_f0.data());
// Estimate spectrum.
world::CheapTrick(waveform.data(), static_cast<int>(waveform.size()),
static_cast<int>(sampling_rate_), time_axis.data(),
modified_f0.data(), f0_length, &option, pointers.data());
return true;
}
} // namespace sptk