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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 torch | |
| import librosa | |
| import numpy as np | |
| from torchmetrics.audio.stoi import ShortTimeObjectiveIntelligibility | |
| def extract_stoi(audio_ref, audio_deg, fs=None, extended=False, method="cut"): | |
| """Compute Short-Time Objective Intelligibility 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. | |
| 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. | |
| """ | |
| # 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) | |
| # Initialize method | |
| stoi = ShortTimeObjectiveIntelligibility(fs, extended) | |
| # Audio length alignment | |
| if len(audio_ref) != len(audio_deg): | |
| if method == "cut": | |
| length = min(len(audio_ref), len(audio_deg)) | |
| audio_ref = audio_ref[:length] | |
| audio_deg = audio_deg[:length] | |
| elif method == "dtw": | |
| _, wp = librosa.sequence.dtw(audio_ref, audio_deg, backtrack=True) | |
| audio_ref_new = [] | |
| audio_deg_new = [] | |
| for i in range(wp.shape[0]): | |
| ref_index = wp[i][0] | |
| deg_index = wp[i][1] | |
| audio_ref_new.append(audio_ref[ref_index]) | |
| audio_deg_new.append(audio_deg[deg_index]) | |
| audio_ref = np.array(audio_ref_new) | |
| audio_deg = np.array(audio_deg_new) | |
| assert len(audio_ref) == len(audio_deg) | |
| # Convert to tensor | |
| audio_ref = torch.from_numpy(audio_ref) | |
| audio_deg = torch.from_numpy(audio_deg) | |
| return stoi(audio_deg, audio_ref).numpy().tolist() | |