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99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
/*
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libspecbleach - A spectral processing library
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Copyright 2022 Luciano Dato <lucianodato@gmail.com>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "denoise_mixer.h"
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#include <stdlib.h>
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#include <string.h>
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struct DenoiseMixer {
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float* residual_spectrum;
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float* denoised_spectrum;
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uint32_t fft_size;
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uint32_t real_spectrum_size;
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uint32_t sample_rate;
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uint32_t hop;
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};
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DenoiseMixer* denoise_mixer_initialize(uint32_t fft_size, uint32_t sample_rate,
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uint32_t hop) {
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DenoiseMixer* self = (DenoiseMixer*)calloc(1U, sizeof(DenoiseMixer));
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if (!self) {
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return NULL;
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}
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self->fft_size = fft_size;
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self->real_spectrum_size = (self->fft_size / 2U) + 1U;
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self->sample_rate = sample_rate;
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self->hop = hop;
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self->residual_spectrum = (float*)calloc((self->fft_size), sizeof(float));
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self->denoised_spectrum = (float*)calloc((self->fft_size), sizeof(float));
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if (!self->residual_spectrum || !self->denoised_spectrum) {
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denoise_mixer_free(self);
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return NULL;
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}
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return self;
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}
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void denoise_mixer_free(DenoiseMixer* self) {
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if (!self) {
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return;
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}
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free(self->residual_spectrum);
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free(self->denoised_spectrum);
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free(self);
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}
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bool denoise_mixer_run(DenoiseMixer* self, float* fft_spectrum,
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const float* gain_spectrum,
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DenoiseMixerParameters parameters) {
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if (!fft_spectrum || !gain_spectrum) {
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return false;
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}
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// Get denoised spectrum - Apply to both real and complex parts
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for (uint32_t k = 0U; k < self->fft_size; k++) {
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self->denoised_spectrum[k] = fft_spectrum[k] * gain_spectrum[k];
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}
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// Get residual spectrum - Apply to both real and complex parts
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for (uint32_t k = 0U; k < self->fft_size; k++) {
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self->residual_spectrum[k] = fft_spectrum[k] - self->denoised_spectrum[k];
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}
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// Mix denoised and residual - Now a simple toggle
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if (parameters.residual_listen) {
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for (uint32_t k = 0U; k < self->fft_size; k++) {
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fft_spectrum[k] = self->residual_spectrum[k];
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}
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} else {
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for (uint32_t k = 0U; k < self->fft_size; k++) {
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fft_spectrum[k] = self->denoised_spectrum[k];
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}
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}
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return true;
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}
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