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| from abc import ABC, abstractmethod | |
| from collections import Counter, deque | |
| from typing import Any, Deque, Iterator, List, Dict | |
| from pprint import pprint | |
| from segments import merge_timestamps | |
| # Workaround for https://github.com/tensorflow/tensorflow/issues/48797 | |
| try: | |
| import tensorflow as tf | |
| except ModuleNotFoundError: | |
| # Error handling | |
| pass | |
| import torch | |
| import ffmpeg | |
| import numpy as np | |
| from utils import format_timestamp | |
| from enum import Enum | |
| class NonSpeechStrategy(Enum): | |
| """ | |
| Ignore non-speech frames segments. | |
| """ | |
| SKIP = 1 | |
| """ | |
| Just treat non-speech segments as speech. | |
| """ | |
| CREATE_SEGMENT = 2 | |
| """ | |
| Expand speech segments into subsequent non-speech segments. | |
| """ | |
| EXPAND_SEGMENT = 3 | |
| # Defaults for Silero | |
| SPEECH_TRESHOLD = 0.3 | |
| # Minimum size of segments to process | |
| MIN_SEGMENT_DURATION = 1 | |
| # The maximum time for texts from old segments to be used in the next segment | |
| MAX_PROMPT_WINDOW = 0 # seconds (0 = disabled) | |
| PROMPT_NO_SPEECH_PROB = 0.1 # Do not pass the text from segments with a no speech probability higher than this | |
| VAD_MAX_PROCESSING_CHUNK = 60 * 60 # 60 minutes of audio | |
| class TranscriptionConfig(ABC): | |
| def __init__(self, non_speech_strategy: NonSpeechStrategy = NonSpeechStrategy.SKIP, | |
| segment_padding_left: float = None, segment_padding_right = None, max_silent_period: float = None, | |
| max_merge_size: float = None, max_prompt_window: float = None): | |
| self.non_speech_strategy = non_speech_strategy | |
| self.segment_padding_left = segment_padding_left | |
| self.segment_padding_right = segment_padding_right | |
| self.max_silent_period = max_silent_period | |
| self.max_merge_size = max_merge_size | |
| self.max_prompt_window = max_prompt_window | |
| class PeriodicTranscriptionConfig(TranscriptionConfig): | |
| def __init__(self, periodic_duration: float, non_speech_strategy: NonSpeechStrategy = NonSpeechStrategy.SKIP, | |
| segment_padding_left: float = None, segment_padding_right = None, max_silent_period: float = None, | |
| max_merge_size: float = None, max_prompt_window: float = None): | |
| super().__init__(non_speech_strategy, segment_padding_left, segment_padding_right, max_silent_period, max_merge_size, max_prompt_window) | |
| self.periodic_duration = periodic_duration | |
| class AbstractTranscription(ABC): | |
| def __init__(self, sampling_rate: int = 16000): | |
| self.sampling_rate = sampling_rate | |
| def get_audio_segment(self, str, start_time: str = None, duration: str = None): | |
| return load_audio(str, self.sampling_rate, start_time, duration) | |
| def get_transcribe_timestamps(self, audio: str, config: TranscriptionConfig): | |
| """ | |
| Get the start and end timestamps of the sections that should be transcribed by this VAD method. | |
| Parameters | |
| ---------- | |
| audio: str | |
| The audio file. | |
| config: TranscriptionConfig | |
| The transcription configuration. | |
| Returns | |
| ------- | |
| A list of start and end timestamps, in fractional seconds. | |
| """ | |
| return | |
| def transcribe(self, audio: str, whisperCallable, config: TranscriptionConfig): | |
| """ | |
| Transcribe the given audo file. | |
| Parameters | |
| ---------- | |
| audio: str | |
| The audio file. | |
| whisperCallable: Callable[[Union[str, np.ndarray, torch.Tensor], int, str, str], dict[str, Union[dict, Any]]] | |
| The callback that is used to invoke Whisper on an audio file/buffer. The first parameter is the audio file/buffer, | |
| the second parameter is an optional text prompt, and the last is the current detected language. The return value is the result of the Whisper call. | |
| Returns | |
| ------- | |
| A list of start and end timestamps, in fractional seconds. | |
| """ | |
| # get speech timestamps from full audio file | |
| seconds_timestamps = self.get_transcribe_timestamps(audio, config) | |
| #for seconds_timestamp in seconds_timestamps: | |
| # print("VAD timestamp ", format_timestamp(seconds_timestamp['start']), " to ", format_timestamp(seconds_timestamp['end'])) | |
| merged = merge_timestamps(seconds_timestamps, config.max_silent_period, config.max_merge_size, config.segment_padding_left, config.segment_padding_right) | |
| # A deque of transcribed segments that is passed to the next segment as a prompt | |
| prompt_window = deque() | |
| print("Timestamps:") | |
| pprint(merged) | |
| if config.non_speech_strategy != NonSpeechStrategy.SKIP: | |
| max_audio_duration = get_audio_duration(audio) | |
| # Expand segments to include the gaps between them | |
| if (config.non_speech_strategy == NonSpeechStrategy.CREATE_SEGMENT): | |
| # When we have a prompt window, we create speech segments betwen each segment if we exceed the merge size | |
| merged = self.fill_gaps(merged, total_duration=max_audio_duration, max_expand_size=config.max_merge_size) | |
| elif config.non_speech_strategy == NonSpeechStrategy.EXPAND_SEGMENT: | |
| # With no prompt window, it is better to just expand the segments (this effectively passes the prompt to the next segment) | |
| merged = self.expand_gaps(merged, total_duration=max_audio_duration) | |
| else: | |
| raise Exception("Unknown non-speech strategy: " + str(config.non_speech_strategy)) | |
| print("Transcribing non-speech:") | |
| pprint(merged) | |
| result = { | |
| 'text': "", | |
| 'segments': [], | |
| 'language': "" | |
| } | |
| languageCounter = Counter() | |
| detected_language = None | |
| segment_index = -1 | |
| # For each time segment, run whisper | |
| for segment in merged: | |
| segment_index += 1 | |
| segment_start = segment['start'] | |
| segment_end = segment['end'] | |
| segment_expand_amount = segment.get('expand_amount', 0) | |
| segment_gap = segment.get('gap', False) | |
| segment_duration = segment_end - segment_start | |
| if segment_duration < MIN_SEGMENT_DURATION: | |
| continue; | |
| # Audio to run on Whisper | |
| segment_audio = self.get_audio_segment(audio, start_time = str(segment_start), duration = str(segment_duration)) | |
| # Previous segments to use as a prompt | |
| segment_prompt = ' '.join([segment['text'] for segment in prompt_window]) if len(prompt_window) > 0 else None | |
| # Detected language | |
| detected_language = languageCounter.most_common(1)[0][0] if len(languageCounter) > 0 else None | |
| print("Running whisper from ", format_timestamp(segment_start), " to ", format_timestamp(segment_end), ", duration: ", | |
| segment_duration, "expanded: ", segment_expand_amount, "prompt: ", segment_prompt, "language: ", detected_language) | |
| segment_result = whisperCallable(segment_audio, segment_index, segment_prompt, detected_language) | |
| adjusted_segments = self.adjust_timestamp(segment_result["segments"], adjust_seconds=segment_start, max_source_time=segment_duration) | |
| # Propagate expand amount to the segments | |
| if (segment_expand_amount > 0): | |
| segment_without_expansion = segment_duration - segment_expand_amount | |
| for adjusted_segment in adjusted_segments: | |
| adjusted_segment_end = adjusted_segment['end'] | |
| # Add expand amount if the segment got expanded | |
| if (adjusted_segment_end > segment_without_expansion): | |
| adjusted_segment["expand_amount"] = adjusted_segment_end - segment_without_expansion | |
| # Append to output | |
| result['text'] += segment_result['text'] | |
| result['segments'].extend(adjusted_segments) | |
| # Increment detected language | |
| if not segment_gap: | |
| languageCounter[segment_result['language']] += 1 | |
| # Update prompt window | |
| self.__update_prompt_window(prompt_window, adjusted_segments, segment_end, segment_gap, config) | |
| if detected_language is not None: | |
| result['language'] = detected_language | |
| return result | |
| def __update_prompt_window(self, prompt_window: Deque, adjusted_segments: List, segment_end: float, segment_gap: bool, config: TranscriptionConfig): | |
| if (config.max_prompt_window is not None and config.max_prompt_window > 0): | |
| # Add segments to the current prompt window (unless it is a speech gap) | |
| if not segment_gap: | |
| for segment in adjusted_segments: | |
| if segment.get('no_speech_prob', 0) <= PROMPT_NO_SPEECH_PROB: | |
| prompt_window.append(segment) | |
| while (len(prompt_window) > 0): | |
| first_end_time = prompt_window[0].get('end', 0) | |
| # Time expanded in the segments should be discounted from the prompt window | |
| first_expand_time = prompt_window[0].get('expand_amount', 0) | |
| if (first_end_time - first_expand_time < segment_end - config.max_prompt_window): | |
| prompt_window.popleft() | |
| else: | |
| break | |
| def include_gaps(self, segments: Iterator[dict], min_gap_length: float, total_duration: float): | |
| result = [] | |
| last_end_time = 0 | |
| for segment in segments: | |
| segment_start = float(segment['start']) | |
| segment_end = float(segment['end']) | |
| if (last_end_time != segment_start): | |
| delta = segment_start - last_end_time | |
| if (min_gap_length is None or delta >= min_gap_length): | |
| result.append( { 'start': last_end_time, 'end': segment_start, 'gap': True } ) | |
| last_end_time = segment_end | |
| result.append(segment) | |
| # Also include total duration if specified | |
| if (total_duration is not None and last_end_time < total_duration): | |
| delta = total_duration - segment_start | |
| if (min_gap_length is None or delta >= min_gap_length): | |
| result.append( { 'start': last_end_time, 'end': total_duration, 'gap': True } ) | |
| return result | |
| # Expand the end time of each segment to the start of the next segment | |
| def expand_gaps(self, segments: List[Dict[str, Any]], total_duration: float): | |
| result = [] | |
| if len(segments) == 0: | |
| return result | |
| # Add gap at the beginning if needed | |
| if (segments[0]['start'] > 0): | |
| result.append({ 'start': 0, 'end': segments[0]['start'], 'gap': True } ) | |
| for i in range(len(segments) - 1): | |
| current_segment = segments[i] | |
| next_segment = segments[i + 1] | |
| delta = next_segment['start'] - current_segment['end'] | |
| # Expand if the gap actually exists | |
| if (delta >= 0): | |
| current_segment = current_segment.copy() | |
| current_segment['expand_amount'] = delta | |
| current_segment['end'] = next_segment['start'] | |
| result.append(current_segment) | |
| # Add last segment | |
| last_segment = segments[-1] | |
| result.append(last_segment) | |
| # Also include total duration if specified | |
| if (total_duration is not None): | |
| last_segment = result[-1] | |
| if (last_segment['end'] < total_duration): | |
| last_segment = last_segment.copy() | |
| last_segment['end'] = total_duration | |
| result[-1] = last_segment | |
| return result | |
| def fill_gaps(self, segments: List[Dict[str, Any]], total_duration: float, max_expand_size: float = None): | |
| result = [] | |
| if len(segments) == 0: | |
| return result | |
| # Add gap at the beginning if needed | |
| if (segments[0]['start'] > 0): | |
| result.append({ 'start': 0, 'end': segments[0]['start'], 'gap': True } ) | |
| for i in range(len(segments) - 1): | |
| expanded = False | |
| current_segment = segments[i] | |
| next_segment = segments[i + 1] | |
| delta = next_segment['start'] - current_segment['end'] | |
| if (max_expand_size is not None and delta <= max_expand_size): | |
| # Just expand the current segment | |
| current_segment = current_segment.copy() | |
| current_segment['expand_amount'] = delta | |
| current_segment['end'] = next_segment['start'] | |
| expanded = True | |
| result.append(current_segment) | |
| # Add a gap to the next segment if needed | |
| if (delta >= 0 and not expanded): | |
| result.append({ 'start': current_segment['end'], 'end': next_segment['start'], 'gap': True } ) | |
| # Add last segment | |
| last_segment = segments[-1] | |
| result.append(last_segment) | |
| # Also include total duration if specified | |
| if (total_duration is not None): | |
| last_segment = result[-1] | |
| delta = total_duration - last_segment['end'] | |
| if (delta > 0): | |
| if (max_expand_size is not None and delta <= max_expand_size): | |
| # Expand the last segment | |
| last_segment = last_segment.copy() | |
| last_segment['expand_amount'] = delta | |
| last_segment['end'] = total_duration | |
| result[-1] = last_segment | |
| else: | |
| result.append({ 'start': last_segment['end'], 'end': total_duration, 'gap': True } ) | |
| return result | |
| def adjust_timestamp(self, segments: Iterator[dict], adjust_seconds: float, max_source_time: float = None): | |
| result = [] | |
| for segment in segments: | |
| segment_start = float(segment['start']) | |
| segment_end = float(segment['end']) | |
| # Filter segments? | |
| if (max_source_time is not None): | |
| if (segment_start > max_source_time): | |
| continue | |
| segment_end = min(max_source_time, segment_end) | |
| new_segment = segment.copy() | |
| # Add to start and end | |
| new_segment['start'] = segment_start + adjust_seconds | |
| new_segment['end'] = segment_end + adjust_seconds | |
| result.append(new_segment) | |
| return result | |
| def multiply_timestamps(self, timestamps: List[Dict[str, Any]], factor: float): | |
| result = [] | |
| for entry in timestamps: | |
| start = entry['start'] | |
| end = entry['end'] | |
| result.append({ | |
| 'start': start * factor, | |
| 'end': end * factor | |
| }) | |
| return result | |
| class VadSileroTranscription(AbstractTranscription): | |
| def __init__(self, sampling_rate: int = 16000): | |
| super().__init__(sampling_rate=sampling_rate) | |
| self.model, utils = torch.hub.load(repo_or_dir='snakers4/silero-vad', model='silero_vad') | |
| (self.get_speech_timestamps, _, _, _, _) = utils | |
| def get_transcribe_timestamps(self, audio: str, config: TranscriptionConfig): | |
| audio_duration = get_audio_duration(audio) | |
| result = [] | |
| # Divide procesisng of audio into chunks | |
| chunk_start = 0.0 | |
| while (chunk_start < audio_duration): | |
| chunk_duration = min(audio_duration - chunk_start, VAD_MAX_PROCESSING_CHUNK) | |
| print("Processing VAD in chunk from {} to {}".format(format_timestamp(chunk_start), format_timestamp(chunk_start + chunk_duration))) | |
| wav = self.get_audio_segment(audio, str(chunk_start), str(chunk_duration)) | |
| sample_timestamps = self.get_speech_timestamps(wav, self.model, sampling_rate=self.sampling_rate, threshold=SPEECH_TRESHOLD) | |
| seconds_timestamps = self.multiply_timestamps(sample_timestamps, factor=1 / self.sampling_rate) | |
| adjusted = self.adjust_timestamp(seconds_timestamps, adjust_seconds=chunk_start, max_source_time=chunk_start + chunk_duration) | |
| #pprint(adjusted) | |
| result.extend(adjusted) | |
| chunk_start += chunk_duration | |
| return result | |
| # A very simple VAD that just marks every N seconds as speech | |
| class VadPeriodicTranscription(AbstractTranscription): | |
| def __init__(self, sampling_rate: int = 16000): | |
| super().__init__(sampling_rate=sampling_rate) | |
| def get_transcribe_timestamps(self, audio: str, config: PeriodicTranscriptionConfig): | |
| # Get duration in seconds | |
| audio_duration = get_audio_duration(audio) | |
| result = [] | |
| # Generate a timestamp every N seconds | |
| start_timestamp = 0 | |
| while (start_timestamp < audio_duration): | |
| end_timestamp = min(start_timestamp + config.periodic_duration, audio_duration) | |
| segment_duration = end_timestamp - start_timestamp | |
| # Minimum duration is 1 second | |
| if (segment_duration >= 1): | |
| result.append( { 'start': start_timestamp, 'end': end_timestamp } ) | |
| start_timestamp = end_timestamp | |
| return result | |
| def get_audio_duration(file: str): | |
| return float(ffmpeg.probe(file)["format"]["duration"]) | |
| def load_audio(file: str, sample_rate: int = 16000, | |
| start_time: str = None, duration: str = None): | |
| """ | |
| Open an audio file and read as mono waveform, resampling as necessary | |
| Parameters | |
| ---------- | |
| file: str | |
| The audio file to open | |
| sr: int | |
| The sample rate to resample the audio if necessary | |
| start_time: str | |
| The start time, using the standard FFMPEG time duration syntax, or None to disable. | |
| duration: str | |
| The duration, using the standard FFMPEG time duration syntax, or None to disable. | |
| Returns | |
| ------- | |
| A NumPy array containing the audio waveform, in float32 dtype. | |
| """ | |
| try: | |
| inputArgs = {'threads': 0} | |
| if (start_time is not None): | |
| inputArgs['ss'] = start_time | |
| if (duration is not None): | |
| inputArgs['t'] = duration | |
| # This launches a subprocess to decode audio while down-mixing and resampling as necessary. | |
| # Requires the ffmpeg CLI and `ffmpeg-python` package to be installed. | |
| out, _ = ( | |
| ffmpeg.input(file, **inputArgs) | |
| .output("-", format="s16le", acodec="pcm_s16le", ac=1, ar=sample_rate) | |
| .run(cmd="ffmpeg", capture_stdout=True, capture_stderr=True) | |
| ) | |
| except ffmpeg.Error as e: | |
| raise RuntimeError(f"Failed to load audio: {e.stderr.decode()}") | |
| return np.frombuffer(out, np.int16).flatten().astype(np.float32) / 32768.0 |