| New file |
| | |
| | | # -*- encoding: utf-8 -*- |
| | | from pathlib import Path |
| | | from typing import Any, Dict, Iterable, List, NamedTuple, Set, Tuple, Union |
| | | |
| | | import numpy as np |
| | | from typeguard import check_argument_types |
| | | import kaldi_native_fbank as knf |
| | | |
| | | root_dir = Path(__file__).resolve().parent |
| | | |
| | | logger_initialized = {} |
| | | |
| | | |
| | | class WavFrontend(): |
| | | """Conventional frontend structure for ASR. |
| | | """ |
| | | |
| | | def __init__( |
| | | self, |
| | | cmvn_file: str = None, |
| | | fs: int = 16000, |
| | | window: str = 'hamming', |
| | | n_mels: int = 80, |
| | | frame_length: int = 25, |
| | | frame_shift: int = 10, |
| | | lfr_m: int = 1, |
| | | lfr_n: int = 1, |
| | | dither: float = 1.0, |
| | | **kwargs, |
| | | ) -> None: |
| | | check_argument_types() |
| | | |
| | | opts = knf.FbankOptions() |
| | | opts.frame_opts.samp_freq = fs |
| | | opts.frame_opts.dither = dither |
| | | opts.frame_opts.window_type = window |
| | | opts.frame_opts.frame_shift_ms = float(frame_shift) |
| | | opts.frame_opts.frame_length_ms = float(frame_length) |
| | | opts.mel_opts.num_bins = n_mels |
| | | opts.energy_floor = 0 |
| | | opts.frame_opts.snip_edges = True |
| | | opts.mel_opts.debug_mel = False |
| | | self.opts = opts |
| | | |
| | | self.lfr_m = lfr_m |
| | | self.lfr_n = lfr_n |
| | | self.cmvn_file = cmvn_file |
| | | |
| | | if self.cmvn_file: |
| | | self.cmvn = self.load_cmvn() |
| | | self.fbank_fn = None |
| | | self.fbank_beg_idx = 0 |
| | | self.reset_status() |
| | | |
| | | def fbank(self, |
| | | waveform: np.ndarray) -> Tuple[np.ndarray, np.ndarray]: |
| | | waveform = waveform * (1 << 15) |
| | | self.fbank_fn = knf.OnlineFbank(self.opts) |
| | | self.fbank_fn.accept_waveform(self.opts.frame_opts.samp_freq, waveform.tolist()) |
| | | frames = self.fbank_fn.num_frames_ready |
| | | mat = np.empty([frames, self.opts.mel_opts.num_bins]) |
| | | for i in range(frames): |
| | | mat[i, :] = self.fbank_fn.get_frame(i) |
| | | feat = mat.astype(np.float32) |
| | | feat_len = np.array(mat.shape[0]).astype(np.int32) |
| | | return feat, feat_len |
| | | |
| | | def fbank_online(self, |
| | | waveform: np.ndarray) -> Tuple[np.ndarray, np.ndarray]: |
| | | waveform = waveform * (1 << 15) |
| | | # self.fbank_fn = knf.OnlineFbank(self.opts) |
| | | self.fbank_fn.accept_waveform(self.opts.frame_opts.samp_freq, waveform.tolist()) |
| | | frames = self.fbank_fn.num_frames_ready |
| | | mat = np.empty([frames, self.opts.mel_opts.num_bins]) |
| | | for i in range(self.fbank_beg_idx, frames): |
| | | mat[i, :] = self.fbank_fn.get_frame(i) |
| | | # self.fbank_beg_idx += (frames-self.fbank_beg_idx) |
| | | feat = mat.astype(np.float32) |
| | | feat_len = np.array(mat.shape[0]).astype(np.int32) |
| | | return feat, feat_len |
| | | |
| | | def reset_status(self): |
| | | self.fbank_fn = knf.OnlineFbank(self.opts) |
| | | self.fbank_beg_idx = 0 |
| | | |
| | | def lfr_cmvn(self, feat: np.ndarray) -> Tuple[np.ndarray, np.ndarray]: |
| | | if self.lfr_m != 1 or self.lfr_n != 1: |
| | | feat = self.apply_lfr(feat, self.lfr_m, self.lfr_n) |
| | | |
| | | if self.cmvn_file: |
| | | feat = self.apply_cmvn(feat) |
| | | |
| | | feat_len = np.array(feat.shape[0]).astype(np.int32) |
| | | return feat, feat_len |
| | | |
| | | @staticmethod |
| | | def apply_lfr(inputs: np.ndarray, lfr_m: int, lfr_n: int) -> np.ndarray: |
| | | LFR_inputs = [] |
| | | |
| | | T = inputs.shape[0] |
| | | T_lfr = int(np.ceil(T / lfr_n)) |
| | | left_padding = np.tile(inputs[0], ((lfr_m - 1) // 2, 1)) |
| | | inputs = np.vstack((left_padding, inputs)) |
| | | T = T + (lfr_m - 1) // 2 |
| | | for i in range(T_lfr): |
| | | if lfr_m <= T - i * lfr_n: |
| | | LFR_inputs.append( |
| | | (inputs[i * lfr_n:i * lfr_n + lfr_m]).reshape(1, -1)) |
| | | else: |
| | | # process last LFR frame |
| | | num_padding = lfr_m - (T - i * lfr_n) |
| | | frame = inputs[i * lfr_n:].reshape(-1) |
| | | for _ in range(num_padding): |
| | | frame = np.hstack((frame, inputs[-1])) |
| | | |
| | | LFR_inputs.append(frame) |
| | | LFR_outputs = np.vstack(LFR_inputs).astype(np.float32) |
| | | return LFR_outputs |
| | | |
| | | def apply_cmvn(self, inputs: np.ndarray) -> np.ndarray: |
| | | """ |
| | | Apply CMVN with mvn data |
| | | """ |
| | | frame, dim = inputs.shape |
| | | means = np.tile(self.cmvn[0:1, :dim], (frame, 1)) |
| | | vars = np.tile(self.cmvn[1:2, :dim], (frame, 1)) |
| | | inputs = (inputs + means) * vars |
| | | return inputs |
| | | |
| | | def load_cmvn(self,) -> np.ndarray: |
| | | with open(self.cmvn_file, 'r', encoding='utf-8') as f: |
| | | lines = f.readlines() |
| | | |
| | | means_list = [] |
| | | vars_list = [] |
| | | for i in range(len(lines)): |
| | | line_item = lines[i].split() |
| | | if line_item[0] == '<AddShift>': |
| | | line_item = lines[i + 1].split() |
| | | if line_item[0] == '<LearnRateCoef>': |
| | | add_shift_line = line_item[3:(len(line_item) - 1)] |
| | | means_list = list(add_shift_line) |
| | | continue |
| | | elif line_item[0] == '<Rescale>': |
| | | line_item = lines[i + 1].split() |
| | | if line_item[0] == '<LearnRateCoef>': |
| | | rescale_line = line_item[3:(len(line_item) - 1)] |
| | | vars_list = list(rescale_line) |
| | | continue |
| | | |
| | | means = np.array(means_list).astype(np.float64) |
| | | vars = np.array(vars_list).astype(np.float64) |
| | | cmvn = np.array([means, vars]) |
| | | return cmvn |
| | | |
| | | def load_bytes(input): |
| | | middle_data = np.frombuffer(input, dtype=np.int16) |
| | | middle_data = np.asarray(middle_data) |
| | | if middle_data.dtype.kind not in 'iu': |
| | | raise TypeError("'middle_data' must be an array of integers") |
| | | dtype = np.dtype('float32') |
| | | if dtype.kind != 'f': |
| | | raise TypeError("'dtype' must be a floating point type") |
| | | |
| | | i = np.iinfo(middle_data.dtype) |
| | | abs_max = 2 ** (i.bits - 1) |
| | | offset = i.min + abs_max |
| | | array = np.frombuffer((middle_data.astype(dtype) - offset) / abs_max, dtype=np.float32) |
| | | return array |
| | | |
| | | |
| | | def test(): |
| | | path = "/nfs/zhifu.gzf/export/damo/speech_paraformer-large_asr_nat-zh-cn-16k-common-vocab8404-pytorch/example/asr_example.wav" |
| | | import librosa |
| | | cmvn_file = "/nfs/zhifu.gzf/export/damo/speech_paraformer-large_asr_nat-zh-cn-16k-common-vocab8404-pytorch/am.mvn" |
| | | config_file = "/nfs/zhifu.gzf/export/damo/speech_paraformer-large_asr_nat-zh-cn-16k-common-vocab8404-pytorch/config.yaml" |
| | | from funasr.runtime.python.onnxruntime.rapid_paraformer.utils.utils import read_yaml |
| | | config = read_yaml(config_file) |
| | | waveform, _ = librosa.load(path, sr=None) |
| | | frontend = WavFrontend( |
| | | cmvn_file=cmvn_file, |
| | | **config['frontend_conf'], |
| | | ) |
| | | speech, _ = frontend.fbank_online(waveform) #1d, (sample,), numpy |
| | | feat, feat_len = frontend.lfr_cmvn(speech) # 2d, (frame, 450), np.float32 -> torch, torch.from_numpy(), dtype, (1, frame, 450) |
| | | |
| | | frontend.reset_status() # clear cache |
| | | return feat, feat_len |
| | | |
| | | if __name__ == '__main__': |
| | | test() |