main/inference/preprocess.py

import os
import sys
import time
import logging
import librosa
import argparse
import logging.handlers

import numpy as np

from tqdm import tqdm
from scipy import signal
from scipy.io import wavfile
from distutils.util import strtobool
from concurrent.futures import ProcessPoolExecutor, as_completed

sys.path.append(os.getcwd())

from main.library.utils import load_audio
from main.configs.config import Config

logger = logging.getLogger(__name__)
for l in ["numba.core.byteflow", "numba.core.ssa", "numba.core.interpreter"]:
    logging.getLogger(l).setLevel(logging.ERROR)

OVERLAP, MAX_AMPLITUDE, ALPHA, HIGH_PASS_CUTOFF, SAMPLE_RATE_16K = 0.3, 0.9, 0.75, 48, 16000
config = Config()
translations = config.translations

def parse_arguments():
    parser = argparse.ArgumentParser()
    parser.add_argument("--model_name", type=str, required=True)
    parser.add_argument("--dataset_path", type=str, default="./dataset")
    parser.add_argument("--sample_rate", type=int, required=True)
    parser.add_argument("--cpu_cores", type=int, default=2)
    parser.add_argument("--cut_preprocess", type=lambda x: bool(strtobool(x)), default=True)
    parser.add_argument("--process_effects", type=lambda x: bool(strtobool(x)), default=False)
    parser.add_argument("--clean_dataset", type=lambda x: bool(strtobool(x)), default=False)
    parser.add_argument("--clean_strength", type=float, default=0.7)

    return parser.parse_args()

class Slicer:
    def __init__(self, sr, threshold = -40.0, min_length = 5000, min_interval = 300, hop_size = 20, max_sil_kept = 5000):
        if not min_length >= min_interval >= hop_size: raise ValueError(translations["min_length>=min_interval>=hop_size"])
        if not max_sil_kept >= hop_size: raise ValueError(translations["max_sil_kept>=hop_size"])

        min_interval = sr * min_interval / 1000
        self.threshold = 10 ** (threshold / 20.0)
        self.hop_size = round(sr * hop_size / 1000)
        self.win_size = min(round(min_interval), 4 * self.hop_size)
        self.min_length = round(sr * min_length / 1000 / self.hop_size)
        self.min_interval = round(min_interval / self.hop_size)
        self.max_sil_kept = round(sr * max_sil_kept / 1000 / self.hop_size)

    def _apply_slice(self, waveform, begin, end):
        start_idx = begin * self.hop_size

        if len(waveform.shape) > 1: return waveform[:, start_idx:min(waveform.shape[1], end * self.hop_size)]
        else: return waveform[start_idx:min(waveform.shape[0], end * self.hop_size)]

    def slice(self, waveform):
        samples = waveform.mean(axis=0) if len(waveform.shape) > 1 else waveform
        if samples.shape[0] <= self.min_length: return [waveform]
        rms_list = get_rms(y=samples, frame_length=self.win_size, hop_length=self.hop_size).squeeze(0)
        sil_tags = []
        silence_start, clip_start = None, 0

        for i, rms in enumerate(rms_list):
            if rms < self.threshold:
                if silence_start is None: silence_start = i
                continue

            if silence_start is None: continue

            is_leading_silence = silence_start == 0 and i > self.max_sil_kept
            need_slice_middle = (i - silence_start >= self.min_interval and i - clip_start >= self.min_length)

            if not is_leading_silence and not need_slice_middle:
                silence_start = None
                continue

            if i - silence_start <= self.max_sil_kept:
                pos = rms_list[silence_start : i + 1].argmin() + silence_start
                sil_tags.append((0, pos) if silence_start == 0 else (pos, pos))   
                clip_start = pos
            elif i - silence_start <= self.max_sil_kept * 2:
                pos = rms_list[i - self.max_sil_kept : silence_start + self.max_sil_kept + 1].argmin()
                pos += i - self.max_sil_kept
                pos_r = (rms_list[i - self.max_sil_kept : i + 1].argmin() + i - self.max_sil_kept)

                if silence_start == 0:
                    sil_tags.append((0, pos_r))
                    clip_start = pos_r
                else:
                    sil_tags.append((min((rms_list[silence_start : silence_start + self.max_sil_kept + 1].argmin() + silence_start), pos), max(pos_r, pos)))
                    clip_start = max(pos_r, pos)
            else:
                pos_r = (rms_list[i - self.max_sil_kept : i + 1].argmin() + i - self.max_sil_kept)
                sil_tags.append((0, pos_r) if silence_start == 0 else ((rms_list[silence_start : silence_start + self.max_sil_kept + 1].argmin() + silence_start), pos_r))
                clip_start = pos_r

            silence_start = None
        total_frames = rms_list.shape[0]
        if (silence_start is not None and total_frames - silence_start >= self.min_interval): sil_tags.append((rms_list[silence_start : min(total_frames, silence_start + self.max_sil_kept) + 1].argmin() + silence_start, total_frames + 1))

        if not sil_tags: return [waveform]
        else:
            chunks = []
            if sil_tags[0][0] > 0: chunks.append(self._apply_slice(waveform, 0, sil_tags[0][0]))

            for i in range(len(sil_tags) - 1):
                chunks.append(self._apply_slice(waveform, sil_tags[i][1], sil_tags[i + 1][0]))

            if sil_tags[-1][1] < total_frames: chunks.append(self._apply_slice(waveform, sil_tags[-1][1], total_frames))
            return chunks

def get_rms(y, frame_length=2048, hop_length=512, pad_mode="constant"):
    y = np.pad(y, (int(frame_length // 2), int(frame_length // 2)), mode=pad_mode)
    axis = -1
    x_shape_trimmed = list(y.shape)
    x_shape_trimmed[axis] -= frame_length - 1
    xw = np.moveaxis(np.lib.stride_tricks.as_strided(y, shape=tuple(x_shape_trimmed) + tuple([frame_length]), strides=y.strides + tuple([y.strides[axis]])), -1, axis - 1 if axis < 0 else axis + 1)
    slices = [slice(None)] * xw.ndim
    slices[axis] = slice(0, None, hop_length)
    return np.sqrt(np.mean(np.abs(xw[tuple(slices)]) ** 2, axis=-2, keepdims=True))

class PreProcess:
    def __init__(self, sr, exp_dir, per):
        self.slicer = Slicer(sr=sr, threshold=-42, min_length=1500, min_interval=400, hop_size=15, max_sil_kept=500)
        self.sr = sr
        self.b_high, self.a_high = signal.butter(N=5, Wn=HIGH_PASS_CUTOFF, btype="high", fs=self.sr)
        self.per = per
        self.exp_dir = exp_dir
        self.device = "cpu"
        self.gt_wavs_dir = os.path.join(exp_dir, "sliced_audios")
        self.wavs16k_dir = os.path.join(exp_dir, "sliced_audios_16k")
        os.makedirs(self.gt_wavs_dir, exist_ok=True)
        os.makedirs(self.wavs16k_dir, exist_ok=True)

    def _normalize_audio(self, audio):
        tmp_max = np.abs(audio).max()
        if tmp_max > 2.5: return None
        return (audio / tmp_max * (MAX_AMPLITUDE * ALPHA)) + (1 - ALPHA) * audio

    def process_audio_segment(self, normalized_audio, sid, idx0, idx1):
        if normalized_audio is None:
            logger.debug(f"{sid}-{idx0}-{idx1}-filtered")
            return
        
        wavfile.write(os.path.join(self.gt_wavs_dir, f"{sid}_{idx0}_{idx1}.wav"), self.sr, normalized_audio.astype(np.float32))
        wavfile.write(os.path.join(self.wavs16k_dir, f"{sid}_{idx0}_{idx1}.wav"), SAMPLE_RATE_16K, librosa.resample(normalized_audio, orig_sr=self.sr, target_sr=SAMPLE_RATE_16K, res_type="soxr_vhq").astype(np.float32))

    def process_audio(self, path, idx0, sid, cut_preprocess, process_effects, clean_dataset, clean_strength):
        try:
            audio = load_audio(logger, path, self.sr)

            if process_effects: 
                audio = signal.lfilter(self.b_high, self.a_high, audio)
                audio = self._normalize_audio(audio)

            if clean_dataset: 
                from main.tools.noisereduce import reduce_noise
                audio = reduce_noise(y=audio, sr=self.sr, prop_decrease=clean_strength, device=config.device)

            idx1 = 0
            if cut_preprocess:
                for audio_segment in self.slicer.slice(audio):
                    i = 0

                    while 1:
                        start = int(self.sr * (self.per - OVERLAP) * i)
                        i += 1

                        if len(audio_segment[start:]) > (self.per + OVERLAP) * self.sr:
                            self.process_audio_segment(audio_segment[start : start + int(self.per * self.sr)], sid, idx0, idx1)
                            idx1 += 1
                        else:
                            self.process_audio_segment(audio_segment[start:], sid, idx0, idx1)
                            idx1 += 1
                            break
            else: self.process_audio_segment(audio, sid, idx0, idx1)
        except Exception as e:
            raise RuntimeError(f"{translations['process_audio_error']}: {e}")

def process_file(args):
    pp, file, cut_preprocess, process_effects, clean_dataset, clean_strength = (args)
    file_path, idx0, sid = file
    pp.process_audio(file_path, idx0, sid, cut_preprocess, process_effects, clean_dataset, clean_strength)

def preprocess_training_set(input_root, sr, num_processes, exp_dir, per, cut_preprocess, process_effects, clean_dataset, clean_strength):
    start_time = time.time()

    pp = PreProcess(sr, exp_dir, per)
    logger.info(translations["start_preprocess"].format(num_processes=num_processes))
    files = []
    idx = 0

    for root, _, filenames in os.walk(input_root):
        try:
            sid = 0 if root == input_root else int(os.path.basename(root))

            for f in filenames:
                if f.lower().endswith(("wav", "mp3", "flac", "ogg", "opus", "m4a", "mp4", "aac", "alac", "wma", "aiff", "webm", "ac3")):
                    files.append((os.path.join(root, f), idx, sid))
                    idx += 1
        except ValueError:
            raise ValueError(f"{translations['not_integer']} '{os.path.basename(root)}'.")

    with tqdm(total=len(files), ncols=100, unit="f") as pbar:
        with ProcessPoolExecutor(max_workers=num_processes) as executor:
            futures = [executor.submit(process_file, (pp, file, cut_preprocess, process_effects, clean_dataset, clean_strength)) for file in files]
            for future in as_completed(futures):
                try:
                    future.result() 
                except Exception as e:
                    raise RuntimeError(f"{translations['process_error']}: {e}")
                pbar.update(1)
                logger.debug(pbar.format_meter(pbar.n, pbar.total, pbar.format_dict["elapsed"]))

    elapsed_time = time.time() - start_time
    logger.info(translations["preprocess_success"].format(elapsed_time=f"{elapsed_time:.2f}"))

if __name__ == "__main__":
    args = parse_arguments()
    experiment_directory = os.path.join("assets", "logs", args.model_name)
    num_processes = args.cpu_cores
    num_processes = 2 if num_processes is None else int(num_processes)
    dataset = args.dataset_path
    sample_rate = args.sample_rate
    cut_preprocess = args.cut_preprocess
    preprocess_effects = args.process_effects
    clean_dataset = args.clean_dataset
    clean_strength = args.clean_strength

    os.makedirs(experiment_directory, exist_ok=True)
    
    if logger.hasHandlers(): logger.handlers.clear()
    else:
        console_handler = logging.StreamHandler()
        console_formatter = logging.Formatter(fmt="\n%(asctime)s.%(msecs)03d | %(levelname)s | %(module)s | %(message)s", datefmt="%Y-%m-%d %H:%M:%S")
        console_handler.setFormatter(console_formatter)
        console_handler.setLevel(logging.INFO)
        file_handler = logging.handlers.RotatingFileHandler(os.path.join(experiment_directory, "preprocess.log"), maxBytes=5*1024*1024, backupCount=3, encoding='utf-8')
        file_formatter = logging.Formatter(fmt="\n%(asctime)s.%(msecs)03d | %(levelname)s | %(module)s | %(message)s", datefmt="%Y-%m-%d %H:%M:%S")
        file_handler.setFormatter(file_formatter)
        file_handler.setLevel(logging.DEBUG)
        logger.addHandler(console_handler)
        logger.addHandler(file_handler)
        logger.setLevel(logging.DEBUG)

    log_data = {translations['modelname']: args.model_name, translations['export_process']: experiment_directory, translations['dataset_folder']: dataset, translations['pretrain_sr']: sample_rate, translations['cpu_core']: num_processes, translations['split_audio']: cut_preprocess, translations['preprocess_effect']: preprocess_effects, translations['clear_audio']: clean_dataset}
    if clean_dataset: log_data[translations['clean_strength']] = clean_strength

    for key, value in log_data.items():
        logger.debug(f"{key}: {value}")

    pid_path = os.path.join(experiment_directory, "preprocess_pid.txt")
    with open(pid_path, "w") as pid_file:
        pid_file.write(str(os.getpid()))
    
    try:
        preprocess_training_set(dataset, sample_rate, num_processes, experiment_directory, 3.7, cut_preprocess, preprocess_effects, clean_dataset, clean_strength)
    except Exception as e:
        logger.error(f"{translations['process_audio_error']} {e}")
        import traceback
        logger.debug(traceback.format_exc())
        
    if os.path.exists(pid_path): os.remove(pid_path)
    logger.info(f"{translations['preprocess_model_success']} {args.model_name}")