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| # Copyright (c) 2023 Amphion. | |
| # | |
| # This source code is licensed under the MIT license found in the | |
| # LICENSE file in the root directory of this source tree. | |
| import math | |
| import librosa | |
| import torch | |
| import numpy as np | |
| from numpy import linalg as LA | |
| from torchmetrics import PearsonCorrCoef | |
| def extract_energy_pearson_coeffcients( | |
| audio_ref, | |
| audio_deg, | |
| fs=None, | |
| n_fft=1024, | |
| hop_length=256, | |
| win_length=1024, | |
| method="dtw", | |
| db_scale=True, | |
| ): | |
| """Compute Energy Pearson Coefficients between the predicted and the ground truth audio. | |
| audio_ref: path to the ground truth audio. | |
| audio_deg: path to the predicted audio. | |
| fs: sampling rate. | |
| n_fft: fft size. | |
| hop_length: hop length. | |
| win_length: window length. | |
| method: "dtw" will use dtw algorithm to align the length of the ground truth and predicted audio. | |
| "cut" will cut both audios into a same length according to the one with the shorter length. | |
| db_scale: the ground truth and predicted audio will be converted to db_scale if "True". | |
| """ | |
| # Initialize method | |
| pearson = PearsonCorrCoef() | |
| # Load audio | |
| if fs != None: | |
| audio_ref, _ = librosa.load(audio_ref, sr=fs) | |
| audio_deg, _ = librosa.load(audio_deg, sr=fs) | |
| else: | |
| audio_ref, fs = librosa.load(audio_ref) | |
| audio_deg, fs = librosa.load(audio_deg) | |
| # STFT | |
| spec_ref = librosa.stft( | |
| y=audio_ref, n_fft=n_fft, hop_length=hop_length, win_length=win_length | |
| ) | |
| spec_deg = librosa.stft( | |
| y=audio_deg, n_fft=n_fft, hop_length=hop_length, win_length=win_length | |
| ) | |
| # Get magnitudes | |
| mag_ref = np.abs(spec_ref).T | |
| mag_deg = np.abs(spec_deg).T | |
| # Convert spectrogram to energy | |
| energy_ref = LA.norm(mag_ref, axis=1) | |
| energy_deg = LA.norm(mag_deg, axis=1) | |
| # Convert to db_scale | |
| if db_scale: | |
| energy_ref = 20 * np.log10(energy_ref) | |
| energy_deg = 20 * np.log10(energy_deg) | |
| # Audio length alignment | |
| if method == "cut": | |
| length = min(len(energy_ref), len(energy_deg)) | |
| energy_ref = energy_ref[:length] | |
| energy_deg = energy_deg[:length] | |
| elif method == "dtw": | |
| _, wp = librosa.sequence.dtw(energy_ref, energy_deg, backtrack=True) | |
| energy_gt_new = [] | |
| energy_pred_new = [] | |
| for i in range(wp.shape[0]): | |
| gt_index = wp[i][0] | |
| pred_index = wp[i][1] | |
| energy_gt_new.append(energy_ref[gt_index]) | |
| energy_pred_new.append(energy_deg[pred_index]) | |
| energy_ref = np.array(energy_gt_new) | |
| energy_deg = np.array(energy_pred_new) | |
| assert len(energy_ref) == len(energy_deg) | |
| # Convert to tensor | |
| energy_ref = torch.from_numpy(energy_ref) | |
| energy_deg = torch.from_numpy(energy_deg) | |
| return pearson(energy_ref, energy_deg).numpy().tolist() | |