import asyncio import numpy as np from time import time, sleep import math import logging import traceback from whisperlivekit.timed_objects import ASRToken, Silence, Line, FrontData, State, Transcript, ChangeSpeaker from whisperlivekit.core import TranscriptionEngine, online_factory, online_diarization_factory, online_translation_factory from whisperlivekit.silero_vad_iterator import FixedVADIterator from whisperlivekit.results_formater import format_output from whisperlivekit.ffmpeg_manager import FFmpegManager, FFmpegState # Set up logging once logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s") logger = logging.getLogger(__name__) logger.setLevel(logging.DEBUG) SENTINEL = object() # unique sentinel object for end of stream marker async def get_all_from_queue(queue): items = [] try: while True: item = queue.get_nowait() items.append(item) except asyncio.QueueEmpty: pass return items class AudioProcessor: """ Processes audio streams for transcription and diarization. Handles audio processing, state management, and result formatting. """ def __init__(self, **kwargs): """Initialize the audio processor with configuration, models, and state.""" if 'transcription_engine' in kwargs and isinstance(kwargs['transcription_engine'], TranscriptionEngine): models = kwargs['transcription_engine'] else: models = TranscriptionEngine(**kwargs) # Audio processing settings self.args = models.args self.sample_rate = 16000 self.channels = 1 self.samples_per_sec = int(self.sample_rate * self.args.min_chunk_size) self.bytes_per_sample = 2 self.bytes_per_sec = self.samples_per_sec * self.bytes_per_sample self.max_bytes_per_sec = 32000 * 5 # 5 seconds of audio at 32 kHz self.is_pcm_input = self.args.pcm_input self.debug = False # State management self.is_stopping = False self.silence = False self.silence_duration = 0.0 self.tokens = [] self.translated_segments = [] self.buffer_transcription = Transcript() self.end_buffer = 0 self.end_attributed_speaker = 0 self.lock = asyncio.Lock() self.beg_loop = None #to deal with a potential little lag at the websocket initialization, this is now set in process_audio self.sep = " " # Default separator self.last_response_content = FrontData() self.last_detected_speaker = None self.speaker_languages = {} self.cumulative_pcm_len = 0 self.diarization_before_transcription = False # Models and processing self.asr = models.asr self.tokenizer = models.tokenizer self.vac_model = models.vac_model if self.args.vac: self.vac = FixedVADIterator(models.vac_model) else: self.vac = None self.ffmpeg_manager = None self.ffmpeg_reader_task = None self._ffmpeg_error = None if not self.is_pcm_input: self.ffmpeg_manager = FFmpegManager( sample_rate=self.sample_rate, channels=self.channels ) async def handle_ffmpeg_error(error_type: str): logger.error(f"FFmpeg error: {error_type}") self._ffmpeg_error = error_type self.ffmpeg_manager.on_error_callback = handle_ffmpeg_error self.transcription_queue = asyncio.Queue() if self.args.transcription else None self.diarization_queue = asyncio.Queue() if self.args.diarization else None self.translation_queue = asyncio.Queue() if self.args.target_language else None self.pcm_buffer = bytearray() self.transcription_task = None self.diarization_task = None self.watchdog_task = None self.all_tasks_for_cleanup = [] self.online_translation = None if self.args.transcription: self.online = online_factory(self.args, models.asr, models.tokenizer) self.sep = self.online.asr.sep if self.args.diarization: self.diarization = online_diarization_factory(self.args, models.diarization_model) if models.translation_model: self.online_translation = online_translation_factory(self.args, models.translation_model) def convert_pcm_to_float(self, pcm_buffer): """Convert PCM buffer in s16le format to normalized NumPy array.""" return np.frombuffer(pcm_buffer, dtype=np.int16).astype(np.float32) / 32768.0 async def add_dummy_token(self): """Placeholder token when no transcription is available.""" async with self.lock: current_time = time() - self.beg_loop if self.beg_loop else 0 self.tokens.append(ASRToken( start=current_time, end=current_time + 1, text=".", speaker=-1, is_dummy=True )) async def get_current_state(self): """Get current state.""" async with self.lock: current_time = time() # Calculate remaining times remaining_transcription = 0 if self.end_buffer > 0: remaining_transcription = max(0, round(current_time - self.beg_loop - self.end_buffer, 1)) remaining_diarization = 0 if self.tokens: latest_end = max(self.end_buffer, self.tokens[-1].end if self.tokens else 0) remaining_diarization = max(0, round(latest_end - self.end_attributed_speaker, 1)) return State( tokens=self.tokens.copy(), translated_segments=self.translated_segments.copy(), buffer_transcription=self.buffer_transcription, end_buffer=self.end_buffer, end_attributed_speaker=self.end_attributed_speaker, remaining_time_transcription=remaining_transcription, remaining_time_diarization=remaining_diarization ) async def reset(self): """Reset all state variables to initial values.""" async with self.lock: self.tokens = [] self.translated_segments = [] self.buffer_transcription = Transcript() self.end_buffer = self.end_attributed_speaker = 0 self.beg_loop = time() async def ffmpeg_stdout_reader(self): """Read audio data from FFmpeg stdout and process it into the PCM pipeline.""" beg = time() while True: try: if self.is_stopping: logger.info("Stopping ffmpeg_stdout_reader due to stopping flag.") break state = await self.ffmpeg_manager.get_state() if self.ffmpeg_manager else FFmpegState.STOPPED if state == FFmpegState.FAILED: logger.error("FFmpeg is in FAILED state, cannot read data") break elif state == FFmpegState.STOPPED: logger.info("FFmpeg is stopped") break elif state != FFmpegState.RUNNING: await asyncio.sleep(0.1) continue current_time = time() elapsed_time = max(0.0, current_time - beg) buffer_size = max(int(32000 * elapsed_time), 4096) # dynamic read beg = current_time chunk = await self.ffmpeg_manager.read_data(buffer_size) if not chunk: # No data currently available await asyncio.sleep(0.05) continue self.pcm_buffer.extend(chunk) await self.handle_pcm_data() except asyncio.CancelledError: logger.info("ffmpeg_stdout_reader cancelled.") break except Exception as e: logger.warning(f"Exception in ffmpeg_stdout_reader: {e}") logger.debug(f"Traceback: {traceback.format_exc()}") await asyncio.sleep(0.2) logger.info("FFmpeg stdout processing finished. Signaling downstream processors if needed.") if not self.diarization_before_transcription and self.transcription_queue: await self.transcription_queue.put(SENTINEL) if self.args.diarization and self.diarization_queue: await self.diarization_queue.put(SENTINEL) if self.online_translation: await self.translation_queue.put(SENTINEL) async def transcription_processor(self): """Process audio chunks for transcription.""" cumulative_pcm_duration_stream_time = 0.0 while True: try: item = await self.transcription_queue.get() if item is SENTINEL: logger.debug("Transcription processor received sentinel. Finishing.") self.transcription_queue.task_done() break asr_internal_buffer_duration_s = len(getattr(self.online, 'audio_buffer', [])) / self.online.SAMPLING_RATE transcription_lag_s = max(0.0, time() - self.beg_loop - self.end_buffer) asr_processing_logs = f"internal_buffer={asr_internal_buffer_duration_s:.2f}s | lag={transcription_lag_s:.2f}s |" if type(item) is Silence: asr_processing_logs += f" + Silence of = {item.duration:.2f}s" if self.tokens: asr_processing_logs += f" | last_end = {self.tokens[-1].end} |" logger.info(asr_processing_logs) cumulative_pcm_duration_stream_time += item.duration self.online.insert_silence(item.duration, self.tokens[-1].end if self.tokens else 0) continue elif isinstance(item, ChangeSpeaker): self.online.new_speaker(item) elif isinstance(item, np.ndarray): pcm_array = item logger.info(asr_processing_logs) duration_this_chunk = len(pcm_array) / self.sample_rate cumulative_pcm_duration_stream_time += duration_this_chunk stream_time_end_of_current_pcm = cumulative_pcm_duration_stream_time self.online.insert_audio_chunk(pcm_array, stream_time_end_of_current_pcm) new_tokens, current_audio_processed_upto = await asyncio.to_thread(self.online.process_iter) _buffer_transcript = self.online.get_buffer() buffer_text = _buffer_transcript.text if new_tokens: validated_text = self.sep.join([t.text for t in new_tokens]) if buffer_text.startswith(validated_text): _buffer_transcript.text = buffer_text[len(validated_text):].lstrip() candidate_end_times = [self.end_buffer] if new_tokens: candidate_end_times.append(new_tokens[-1].end) if _buffer_transcript.end is not None: candidate_end_times.append(_buffer_transcript.end) candidate_end_times.append(current_audio_processed_upto) async with self.lock: self.tokens.extend(new_tokens) self.buffer_transcription = _buffer_transcript self.end_buffer = max(candidate_end_times) if self.translation_queue: for token in new_tokens: await self.translation_queue.put(token) self.transcription_queue.task_done() except Exception as e: logger.warning(f"Exception in transcription_processor: {e}") logger.warning(f"Traceback: {traceback.format_exc()}") if 'pcm_array' in locals() and pcm_array is not SENTINEL : # Check if pcm_array was assigned from queue self.transcription_queue.task_done() if self.is_stopping: logger.info("Transcription processor finishing due to stopping flag.") if self.diarization_queue: await self.diarization_queue.put(SENTINEL) if self.translation_queue: await self.translation_queue.put(SENTINEL) logger.info("Transcription processor task finished.") async def diarization_processor(self, diarization_obj): """Process audio chunks for speaker diarization.""" self.current_speaker = 0 while True: try: item = await self.diarization_queue.get() if item is SENTINEL: logger.debug("Diarization processor received sentinel. Finishing.") self.diarization_queue.task_done() break elif type(item) is Silence: diarization_obj.insert_silence(item.duration) continue elif isinstance(item, np.ndarray): pcm_array = item else: raise Exception('item should be pcm_array') # Process diarization await diarization_obj.diarize(pcm_array) segments = diarization_obj.get_segments() if self.diarization_before_transcription: if segments and segments[-1].speaker != self.current_speaker: self.current_speaker = segments[-1].speaker cut_at = int(segments[-1].start*16000 - (self.cumulative_pcm_len)) await self.transcription_queue.put(pcm_array[cut_at:]) await self.transcription_queue.put(ChangeSpeaker(speaker=self.current_speaker, start=cut_at)) await self.transcription_queue.put(pcm_array[:cut_at]) else: await self.transcription_queue.put(pcm_array) else: async with self.lock: self.tokens = diarization_obj.assign_speakers_to_tokens( self.tokens, use_punctuation_split=self.args.punctuation_split ) self.cumulative_pcm_len += len(pcm_array) if len(self.tokens) > 0: self.end_attributed_speaker = max(self.tokens[-1].end, self.end_attributed_speaker) self.diarization_queue.task_done() except Exception as e: logger.warning(f"Exception in diarization_processor: {e}") logger.warning(f"Traceback: {traceback.format_exc()}") if 'pcm_array' in locals() and pcm_array is not SENTINEL: self.diarization_queue.task_done() logger.info("Diarization processor task finished.") async def translation_processor(self): # the idea is to ignore diarization for the moment. We use only transcription tokens. # And the speaker is attributed given the segments used for the translation # in the future we want to have different languages for each speaker etc, so it will be more complex. while True: try: item = await self.translation_queue.get() #block until at least 1 token if item is SENTINEL: logger.debug("Translation processor received sentinel. Finishing.") self.translation_queue.task_done() break elif type(item) is Silence: self.online_translation.insert_silence(item.duration) continue # get all the available tokens for translation. The more words, the more precise tokens_to_process = [item] additional_tokens = await get_all_from_queue(self.translation_queue) sentinel_found = False for additional_token in additional_tokens: if additional_token is SENTINEL: sentinel_found = True break tokens_to_process.append(additional_token) if tokens_to_process: self.online_translation.insert_tokens(tokens_to_process) self.translated_segments = await asyncio.to_thread(self.online_translation.process) self.translation_queue.task_done() for _ in additional_tokens: self.translation_queue.task_done() if sentinel_found: logger.debug("Translation processor received sentinel in batch. Finishing.") break except Exception as e: logger.warning(f"Exception in translation_processor: {e}") logger.warning(f"Traceback: {traceback.format_exc()}") if 'token' in locals() and item is not SENTINEL: self.translation_queue.task_done() if 'additional_tokens' in locals(): for _ in additional_tokens: self.translation_queue.task_done() logger.info("Translation processor task finished.") async def results_formatter(self): """Format processing results for output.""" while True: try: # If FFmpeg error occurred, notify front-end if self._ffmpeg_error: yield FrontData( status="error", error=f"FFmpeg error: {self._ffmpeg_error}" ) self._ffmpeg_error = None await asyncio.sleep(1) continue # Get current state state = await self.get_current_state() # Add dummy tokens if needed if (not state.tokens or state.tokens[-1].is_dummy) and not self.args.transcription and self.args.diarization: await self.add_dummy_token() sleep(0.5) state = await self.get_current_state() # Format output lines, undiarized_text, end_w_silence = format_output( state, self.silence, current_time = time() - self.beg_loop if self.beg_loop else None, args = self.args, debug = self.debug, sep=self.sep ) if end_w_silence: buffer_transcription = Transcript() else: buffer_transcription = state.buffer_transcription buffer_diarization = '' if undiarized_text: buffer_diarization = self.sep.join(undiarized_text) async with self.lock: self.end_attributed_speaker = state.end_attributed_speaker response_status = "active_transcription" if not state.tokens and not buffer_transcription and not buffer_diarization: response_status = "no_audio_detected" lines = [] elif not lines: lines = [Line( speaker=1, start=state.end_buffer, end=state.end_buffer )] response = FrontData( status=response_status, lines=lines, buffer_transcription=buffer_transcription.text.strip(), buffer_diarization=buffer_diarization.strip(), remaining_time_transcription=state.remaining_time_transcription, remaining_time_diarization=state.remaining_time_diarization if self.args.diarization else 0 ) should_push = (response != self.last_response_content) if should_push and (lines or buffer_transcription or buffer_diarization or response_status == "no_audio_detected"): yield response self.last_response_content = response # Check for termination condition if self.is_stopping: all_processors_done = True if self.args.transcription and self.transcription_task and not self.transcription_task.done(): all_processors_done = False if self.args.diarization and self.diarization_task and not self.diarization_task.done(): all_processors_done = False if all_processors_done: logger.info("Results formatter: All upstream processors are done and in stopping state. Terminating.") return await asyncio.sleep(0.05) except Exception as e: logger.warning(f"Exception in results_formatter: {e}") logger.warning(f"Traceback: {traceback.format_exc()}") await asyncio.sleep(0.5) async def create_tasks(self): """Create and start processing tasks.""" self.all_tasks_for_cleanup = [] processing_tasks_for_watchdog = [] # If using FFmpeg (non-PCM input), start it and spawn stdout reader if not self.is_pcm_input: success = await self.ffmpeg_manager.start() if not success: logger.error("Failed to start FFmpeg manager") async def error_generator(): yield FrontData( status="error", error="FFmpeg failed to start. Please check that FFmpeg is installed." ) return error_generator() self.ffmpeg_reader_task = asyncio.create_task(self.ffmpeg_stdout_reader()) self.all_tasks_for_cleanup.append(self.ffmpeg_reader_task) processing_tasks_for_watchdog.append(self.ffmpeg_reader_task) if self.args.transcription and self.online: self.transcription_task = asyncio.create_task(self.transcription_processor()) self.all_tasks_for_cleanup.append(self.transcription_task) processing_tasks_for_watchdog.append(self.transcription_task) if self.args.diarization and self.diarization: self.diarization_task = asyncio.create_task(self.diarization_processor(self.diarization)) self.all_tasks_for_cleanup.append(self.diarization_task) processing_tasks_for_watchdog.append(self.diarization_task) if self.online_translation: self.translation_task = asyncio.create_task(self.translation_processor()) self.all_tasks_for_cleanup.append(self.translation_task) processing_tasks_for_watchdog.append(self.translation_task) # Monitor overall system health self.watchdog_task = asyncio.create_task(self.watchdog(processing_tasks_for_watchdog)) self.all_tasks_for_cleanup.append(self.watchdog_task) return self.results_formatter() async def watchdog(self, tasks_to_monitor): """Monitors the health of critical processing tasks.""" while True: try: await asyncio.sleep(10) for i, task in enumerate(tasks_to_monitor): if task.done(): exc = task.exception() task_name = task.get_name() if hasattr(task, 'get_name') else f"Monitored Task {i}" if exc: logger.error(f"{task_name} unexpectedly completed with exception: {exc}") else: logger.info(f"{task_name} completed normally.") except asyncio.CancelledError: logger.info("Watchdog task cancelled.") break except Exception as e: logger.error(f"Error in watchdog task: {e}", exc_info=True) async def cleanup(self): """Clean up resources when processing is complete.""" logger.info("Starting cleanup of AudioProcessor resources.") self.is_stopping = True for task in self.all_tasks_for_cleanup: if task and not task.done(): task.cancel() created_tasks = [t for t in self.all_tasks_for_cleanup if t] if created_tasks: await asyncio.gather(*created_tasks, return_exceptions=True) logger.info("All processing tasks cancelled or finished.") if not self.is_pcm_input and self.ffmpeg_manager: try: await self.ffmpeg_manager.stop() logger.info("FFmpeg manager stopped.") except Exception as e: logger.warning(f"Error stopping FFmpeg manager: {e}") if self.args.diarization and hasattr(self, 'dianization') and hasattr(self.diarization, 'close'): self.diarization.close() logger.info("AudioProcessor cleanup complete.") async def process_audio(self, message): """Process incoming audio data.""" if not self.beg_loop: self.beg_loop = time() if not message: logger.info("Empty audio message received, initiating stop sequence.") self.is_stopping = True if self.transcription_queue: await self.transcription_queue.put(SENTINEL) if not self.is_pcm_input and self.ffmpeg_manager: await self.ffmpeg_manager.stop() return if self.is_stopping: logger.warning("AudioProcessor is stopping. Ignoring incoming audio.") return if self.is_pcm_input: self.pcm_buffer.extend(message) await self.handle_pcm_data() else: if not self.ffmpeg_manager: logger.error("FFmpeg manager not initialized for non-PCM input.") return success = await self.ffmpeg_manager.write_data(message) if not success: ffmpeg_state = await self.ffmpeg_manager.get_state() if ffmpeg_state == FFmpegState.FAILED: logger.error("FFmpeg is in FAILED state, cannot process audio") else: logger.warning("Failed to write audio data to FFmpeg") async def handle_pcm_data(self): # Process when enough data if len(self.pcm_buffer) < self.bytes_per_sec: return if len(self.pcm_buffer) > self.max_bytes_per_sec: logger.warning( f"Audio buffer too large: {len(self.pcm_buffer) / self.bytes_per_sec:.2f}s. " f"Consider using a smaller model." ) # Process audio chunk pcm_array = self.convert_pcm_to_float(self.pcm_buffer[:self.max_bytes_per_sec]) self.pcm_buffer = self.pcm_buffer[self.max_bytes_per_sec:] res = None end_of_audio = False silence_buffer = None if self.args.vac: res = self.vac(pcm_array) if res is not None: if res.get("end", 0) > res.get("start", 0): end_of_audio = True elif self.silence: #end of silence self.silence = False silence_buffer = Silence(duration=time() - self.start_silence) if silence_buffer: if not self.diarization_before_transcription and self.transcription_queue: await self.transcription_queue.put(silence_buffer) if self.args.diarization and self.diarization_queue: await self.diarization_queue.put(silence_buffer) if self.translation_queue: await self.translation_queue.put(silence_buffer) if not self.silence: if not self.diarization_before_transcription and self.transcription_queue: await self.transcription_queue.put(pcm_array.copy()) if self.args.diarization and self.diarization_queue: await self.diarization_queue.put(pcm_array.copy()) self.silence_duration = 0.0 if end_of_audio: self.silence = True self.start_silence = time() if not self.args.transcription and not self.args.diarization: await asyncio.sleep(0.1)