import torch import numpy as np # import sounddevice as sd import torch import numpy as np import datetime def int2float(sound): abs_max = np.abs(sound).max() sound = sound.astype('float32') if abs_max > 0: sound *= 1/32768 sound = sound.squeeze() # depends on the use case return sound class VoiceActivityController: def __init__( self, sampling_rate = 16000, min_silence_to_final_ms = 500, min_speech_to_final_ms = 100, min_silence_duration_ms = 100, use_vad_result = True, activity_detected_callback=None, threshold =0.3 ): self.activity_detected_callback=activity_detected_callback self.model, self.utils = torch.hub.load( repo_or_dir='snakers4/silero-vad', model='silero_vad' ) (self.get_speech_timestamps, save_audio, read_audio, VADIterator, collect_chunks) = self.utils self.sampling_rate = sampling_rate self.final_silence_limit = min_silence_to_final_ms * self.sampling_rate / 1000 self.final_speech_limit = min_speech_to_final_ms *self.sampling_rate / 1000 self.min_silence_samples = sampling_rate * min_silence_duration_ms / 1000 self.use_vad_result = use_vad_result self.last_marked_chunk = None self.threshold = threshold self.reset_states() def reset_states(self): self.model.reset_states() self.temp_end = 0 self.current_sample = 0 def apply_vad(self, audio): x = int2float(audio) if not torch.is_tensor(x): try: x = torch.Tensor(x) except: raise TypeError("Audio cannot be casted to tensor. Cast it manually") speech_prob = self.model(x, self.sampling_rate).item() window_size_samples = len(x[0]) if x.dim() == 2 else len(x) self.current_sample += window_size_samples if (speech_prob >= self.threshold): self.temp_end = 0 return audio, window_size_samples, 0 else : if not self.temp_end: self.temp_end = self.current_sample if self.current_sample - self.temp_end < self.min_silence_samples: return audio, 0, window_size_samples else: return np.array([], dtype=np.float16) , 0, window_size_samples def detect_user_speech(self, audio_stream, audio_in_int16 = False): last_silence_len= 0 speech_len = 0 for data in audio_stream: # replace with your condition of choice audio_block = np.frombuffer(data, dtype=np.int16) if not audio_in_int16 else data wav = audio_block is_final = False voice_audio, speech_in_wav, last_silent_in_wav = self.apply_vad(wav) if speech_in_wav > 0 : last_silence_len= 0 speech_len += speech_in_wav if self.activity_detected_callback is not None: self.activity_detected_callback() last_silence_len += last_silent_in_wav if last_silence_len>= self.final_silence_limit and speech_len >= self.final_speech_limit: is_final = True last_silence_len= 0 speech_len = 0 yield voice_audio.tobytes(), is_final