476 lines
15 KiB
Python
476 lines
15 KiB
Python
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#!/usr/bin/env python3
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"""
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STT-Skript: Nimmt Audio vom ReSpeaker XVF3800 auf und transkribiert es
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mit faster-whisper (lokal, CPU-only).
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Features:
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- Ansage "Aufnahme laeuft" ueber den ReSpeaker-Lautsprecher (espeak-ng TTS)
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- Kontinuierliche Aufnahme bis das Stoppwort "Ende" erkannt wird
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- Echtzeit-Stoppworterkennung mit Whisper tiny-Modell
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- Finale Transkription mit Whisper medium-Modell (hoehere Genauigkeit)
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- LLM-Korrektur mit gemma3:latest (Ollama) fuer grammatikalisch korrekten Text
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Verwendung:
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python3 stt_respeaker.py # Aufnehmen bis "Ende" gesagt wird
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python3 stt_respeaker.py en # Sprache Englisch, Stoppwort "end"
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python3 stt_respeaker.py --file audio.wav # Vorhandene Datei transkribieren
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Voraussetzungen:
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pip install faster-whisper sounddevice numpy scipy requests
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espeak-ng installiert
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ollama + gemma3:latest installiert
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Beim ersten Aufruf werden die Whisper-Modelle automatisch heruntergeladen.
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"""
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import sys
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import os
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import wave
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import time
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import tempfile
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import argparse
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import subprocess
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import numpy as np
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import sounddevice as sd
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from scipy.signal import resample_poly
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from faster_whisper import WhisperModel
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import requests
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# Output-Buffering deaktivieren
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sys.stdout.reconfigure(line_buffering=True)
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# === Konfiguration ===========================================================
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DEVICE_SR = 48000
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WHISPER_SR = 16000
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CHANNELS = 2
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DTYPE = "float32"
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MODEL_SIZE = "large-v3" # Auf GPU: beste Genauigkeit, ~0.1s pro 30s Audio
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STOPWORD_MODEL = "large-v3" # Gleiche Modell auf GPU, keine zusaetzliche Ladezeit
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DEVICE_COMPUTE = "cuda" # RTX 3090
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COMPUTE_TYPE = "float16" # Beste GPU-Praezision
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GPU_DEVICE_INDEX = 1 # Zweite RTX 3090 (erste ist durch Ollama belegt)
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DEFAULT_LANG = "de"
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DEVICE_KEYWORD = "XVF3800"
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INITIAL_PROMPT = "Nachrichten, Politik, Friedrich Merz, CDU, CSU, SPD, Olaf Scholz, Markus Söder, Kanzler, Merz-Akte"
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# LLM-Korrektur (Ollama)
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LLM_MODEL = "mistral-small3.2:24b"
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LLM_URL = "http://localhost:11434/api/chat"
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LLM_SYSTEM_PROMPT = {
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"de": (
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"Du bist ein Korrektor fuer deutsche Sprachtranskripte. "
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"Korrigiere Grammatik, Rechtschreibung, korrigiere falsch verstandene Woerter und ergaenze fehlende Woerter "
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"zu einem sinnvollen Text. "
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"Achte auf korrekte Namen: Friedrich Merz (CDU), Markus Soeder (CSU), "
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"Olaf Scholz (SPD). "
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"Entferne das Stoppwort 'Ende' am Schluss falls vorhanden. "
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"Antworte NUR mit dem korrigierten Text, ohne Einleitung oder Kommentar."
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),
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"en": (
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"You are a proofreader for English speech transcripts. "
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"Correct grammar, spelling, correct wrong unerstood words and add missing words to make coherent text. "
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"Remove the stopword 'end' at the end. "
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"Reply ONLY with the corrected text, no preamble."
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),
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}
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STOPWORDS = {
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"de": ["ende", "end", "stop"],
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"en": ["end", "stop", "done", "finish"],
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"fr": ["fin", "stop", "termine"],
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"es": ["fin", "stop", "terminado"],
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}
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CHUNK_SEC = 2.0
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MAX_DURATION = 60
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VAD_THRESHOLD = 0.008 # Angepasst fuer ASR-Kanal (rechter Kanal)
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def find_respeaker_device():
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"""Sucht den ReSpeaker XVF3800 in der Liste der Audiogeraete."""
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devices = sd.query_devices()
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for i, dev in enumerate(devices):
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name_lower = dev["name"].lower()
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if (("xvf3800" in name_lower or "respeaker" in name_lower or "array" in name_lower)
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and dev["max_input_channels"] > 0):
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print(f"ReSpeaker gefunden: [{i}] {dev['name']}"
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f" ({dev['max_input_channels']} In, "
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f"{dev['max_output_channels']} Out)")
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return i
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print(f"Kein Geraet mit '{DEVICE_KEYWORD}' gefunden.")
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print("Verfuegbare Eingabegeraete:")
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for i, dev in enumerate(devices):
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if dev["max_input_channels"] > 0:
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print(f" [{i}] {dev['name']}")
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return None
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def play_announcement(text, device_idx, lang="de"):
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"""Erzeugt TTS mit espeak-ng und spielt es ueber den ReSpeaker ab."""
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print(f"Ansage: '{text}'")
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tmp_wav = tempfile.NamedTemporaryFile(
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suffix=".wav", delete=False, prefix="tts_"
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)
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tmp_wav.close()
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espeak_lang = {"de": "de", "en": "en", "fr": "fr", "es": "es"}.get(lang, "de")
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subprocess.run(
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["espeak-ng", "-v", espeak_lang, "-s", "150",
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"-w", tmp_wav.name, text],
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check=True, capture_output=True
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)
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tmp_loud = tempfile.NamedTemporaryFile(
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suffix=".wav", delete=False, prefix="tts_loud_"
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)
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tmp_loud.close()
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subprocess.run(
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["ffmpeg", "-y", "-i", tmp_wav.name,
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"-filter:a", "volume=3.0",
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"-ar", str(DEVICE_SR), "-ac", str(CHANNELS),
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tmp_loud.name],
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check=True, capture_output=True
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)
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sink = ("alsa_output.usb-Seeed_Studio_reSpeaker_"
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"XVF3800_4-Mic_Array_114993700261100055-00.analog-stereo")
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subprocess.run(
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["paplay", "--device", sink,
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"--volume", "1.5", tmp_loud.name],
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check=True, capture_output=True
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)
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os.unlink(tmp_wav.name)
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os.unlink(tmp_loud.name)
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print(" (Ansage beendet)\n")
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def resample_to_16k(audio_48k_mono):
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return resample_poly(audio_48k_mono, 1, 3)
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def stereo_to_mono(audio):
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"""Extrahiert den rechten Kanal (ASR-Output des XVF3800).
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Der rechte Kanal ist der fuer Spracherkennung optimierte ASR-Output
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(AEC residual / auto-select beam). Der linke Kanal ist der verarbeitete
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Beamforming-Output. Beide zu mischen verschlechtert die Qualitaet."""
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if audio.ndim > 1:
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# Rechter Kanal = Index 1 (ASR-Output, optimiert fuer Spracherkennung)
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return audio[:, 1]
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return audio
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def compute_rms(audio_float):
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return float(np.sqrt(np.mean(audio_float ** 2)))
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def check_stopword(audio_16k, model, language, stopword_list):
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rms = compute_rms(audio_16k)
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if rms < VAD_THRESHOLD:
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return False, "", rms
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segments, _ = model.transcribe(
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audio_16k,
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language=language,
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beam_size=1,
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vad_filter=True,
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temperature=0.0,
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)
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text = " ".join(seg.text.strip().lower() for seg in segments)
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for word in stopword_list:
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if word in text:
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return True, text, rms
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return False, text, rms
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def record_until_stopword(device_idx, language, stopword_list):
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"""Nimmt kontinuierlich auf bis Stoppwort erkannt wird."""
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print(f"Lade Whisper-Modell '{STOPWORD_MODEL}' (GPU)...")
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sw_model = WhisperModel(
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STOPWORD_MODEL, device=DEVICE_COMPUTE, compute_type=COMPUTE_TYPE,
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device_index=GPU_DEVICE_INDEX,
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)
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print(f"Aufnahme laeuft — sage '{stopword_list[0]}' zum Stoppen.")
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print(f" (Notbremse nach {MAX_DURATION}s)\n")
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chunk_samples = int(CHUNK_SEC * DEVICE_SR)
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all_audio_48k = []
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total_duration = 0.0
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stream = sd.InputStream(
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samplerate=DEVICE_SR,
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channels=CHANNELS,
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dtype=DTYPE,
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device=device_idx,
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blocksize=chunk_samples,
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)
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stream.start()
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try:
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while total_duration < MAX_DURATION:
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chunk, overflowed = stream.read(chunk_samples)
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if overflowed:
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print(" Buffer Overflow!")
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chunk_mono = stereo_to_mono(chunk)
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chunk_16k = resample_to_16k(chunk_mono)
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all_audio_48k.append(chunk_mono)
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total_duration += CHUNK_SEC
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rms = compute_rms(chunk_16k)
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if rms >= VAD_THRESHOLD:
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is_stop, text, rms = check_stopword(
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chunk_16k, sw_model, language, stopword_list
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)
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bar = "#" * min(int(rms * 200), 30)
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status = f" [{total_duration:5.1f}s] RMS:{rms:.3f} {bar}"
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if text:
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status += f" '{text}'"
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print(status)
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if is_stop:
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print(f"\n>>> Stoppwort erkannt: '{text}'")
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break
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else:
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print(f" [{total_duration:5.1f}s] RMS:{rms:.3f} (Stille)")
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finally:
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stream.stop()
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stream.close()
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full_audio_48k = np.concatenate(all_audio_48k)
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full_audio_16k = resample_to_16k(full_audio_48k)
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# Software-Verstaerkung: Audio normalisieren auf -3 dBFS Peak
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# Der XVF3800 liefert sehr leises Signal, daher nachverstaerken
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peak = float(np.max(np.abs(full_audio_16k)))
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if peak > 0.001:
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target_peak = 0.7 # -3 dBFS
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gain = target_peak / peak
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full_audio_16k = full_audio_16k * gain
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full_audio_16k = np.clip(full_audio_16k, -1.0, 1.0)
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print(f" Lautstaerke-Anpassung: Gain x{gain:.1f} "
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f"(Peak {peak:.3f} -> {target_peak:.3f})")
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else:
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print(" Warnung: Sehr leises Signal, keine Verstaerkung.")
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print(f"\nAufnahme beendet. Gesamtdauer: "
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f"{len(full_audio_16k)/WHISPER_SR:.1f}s\n")
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return full_audio_16k
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def save_wav(audio_data, filename):
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audio_int16 = (audio_data * 32767).astype(np.int16)
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with wave.open(filename, "wb") as wf:
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wf.setnchannels(1)
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wf.setsampwidth(2)
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wf.setframerate(WHISPER_SR)
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wf.writeframes(audio_int16.tobytes())
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def transcribe(audio_data, language="de", model_size=MODEL_SIZE):
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"""Transkribiert Audio mit faster-whisper."""
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print(f"Lade Whisper-Modell '{model_size}'"
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f" (device={DEVICE_COMPUTE}, compute={COMPUTE_TYPE})...")
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print(" (Beim ersten Aufruf wird das Modell heruntergeladen.)\n")
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model = WhisperModel(
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model_size,
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device=DEVICE_COMPUTE,
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compute_type=COMPUTE_TYPE,
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device_index=GPU_DEVICE_INDEX,
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)
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print("Transkribiere...\n")
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transcribe_kwargs = dict(
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language=language,
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beam_size=5,
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vad_filter=True,
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best_of=5,
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temperature=[0.0, 0.2, 0.4, 0.6],
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)
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if INITIAL_PROMPT:
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transcribe_kwargs["initial_prompt"] = INITIAL_PROMPT
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segments, info = model.transcribe(audio_data, **transcribe_kwargs)
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print(f" Sprache erkannt: {info.language}"
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f" ({info.language_probability:.1%})")
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print(f" Dauer: {info.duration:.1f}s\n")
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full_text = ""
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print("--- Whisper-Transkription (roh) ----------------------")
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for seg in segments:
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timestamp = f"[{seg.start:5.1f}s - {seg.end:5.1f}s]"
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print(f" {timestamp} {seg.text}")
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full_text += seg.text + " "
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print("------------------------------------------------------\n")
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return full_text.strip()
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def llm_correct(text, language="de"):
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"""Korrigiert den transkribierten Text mit einem lokalen LLM (Ollama Chat API)."""
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if not text:
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return text
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system_prompt = LLM_SYSTEM_PROMPT.get(language, LLM_SYSTEM_PROMPT["de"])
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print(f"LLM-Korrektur mit '{LLM_MODEL}' (Ollama)...\n")
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try:
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response = requests.post(
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LLM_URL,
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json={
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"model": LLM_MODEL,
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"messages": [
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{"role": "system", "content": system_prompt},
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{"role": "user", "content": text},
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],
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"stream": False,
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"options": {
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"temperature": 0.0,
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"num_predict": 500,
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},
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},
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timeout=180,
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)
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response.raise_for_status()
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result = response.json().get("message", {}).get("content", "").strip()
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if result:
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print("--- LLM-korrigierter Text ----------------------------")
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print(f" {result}")
|
||
|
|
print("------------------------------------------------------\n")
|
||
|
|
return result
|
||
|
|
else:
|
||
|
|
print("LLM lieferte leere Antwort — verwende Whisper-Text.\n")
|
||
|
|
return text
|
||
|
|
|
||
|
|
except requests.exceptions.RequestException as e:
|
||
|
|
print(f"Fehler bei LLM-Korrektur: {e}")
|
||
|
|
print("Verwende unkorrigierten Whisper-Text.\n")
|
||
|
|
return text
|
||
|
|
|
||
|
|
|
||
|
|
def transcribe_file(filepath, language, model_size=MODEL_SIZE):
|
||
|
|
"""Transkribiert eine vorhandene WAV-Datei."""
|
||
|
|
print(f"Lade Datei: {filepath}\n")
|
||
|
|
with wave.open(filepath, "rb") as wf:
|
||
|
|
frames = wf.readframes(wf.getnframes())
|
||
|
|
audio_int16 = np.frombuffer(frames, dtype=np.int16)
|
||
|
|
audio_float = audio_int16.astype(np.float32) / 32767.0
|
||
|
|
file_sr = wf.getframerate()
|
||
|
|
|
||
|
|
print(f" Dauer: {len(audio_float) / file_sr:.1f}s")
|
||
|
|
print(f" Samplerate: {file_sr} Hz\n")
|
||
|
|
|
||
|
|
if file_sr != WHISPER_SR:
|
||
|
|
print(f" Resample: {file_sr} -> {WHISPER_SR} Hz")
|
||
|
|
from math import gcd
|
||
|
|
g = gcd(file_sr, WHISPER_SR)
|
||
|
|
up = WHISPER_SR // g
|
||
|
|
down = file_sr // g
|
||
|
|
audio_float = resample_poly(audio_float, up, down)
|
||
|
|
|
||
|
|
whisper_text = transcribe(audio_float, language, model_size)
|
||
|
|
|
||
|
|
if whisper_text:
|
||
|
|
corrected = llm_correct(whisper_text, language)
|
||
|
|
return corrected
|
||
|
|
return whisper_text
|
||
|
|
|
||
|
|
|
||
|
|
def main():
|
||
|
|
parser = argparse.ArgumentParser(
|
||
|
|
description="STT mit ReSpeaker XVF3800 + faster-whisper + LLM-Korrektur"
|
||
|
|
)
|
||
|
|
parser.add_argument(
|
||
|
|
"language",
|
||
|
|
type=str,
|
||
|
|
nargs="?",
|
||
|
|
default=DEFAULT_LANG,
|
||
|
|
help="Sprachcode: de, en, fr, es, ... (Standard: de)",
|
||
|
|
)
|
||
|
|
parser.add_argument(
|
||
|
|
"--file",
|
||
|
|
type=str,
|
||
|
|
default=None,
|
||
|
|
help="Vorhandene WAV-Datei transkribieren statt live aufzunehmen",
|
||
|
|
)
|
||
|
|
parser.add_argument(
|
||
|
|
"--model",
|
||
|
|
type=str,
|
||
|
|
default=MODEL_SIZE,
|
||
|
|
help=f"Whisper-Modell: tiny|base|small|medium|large-v3"
|
||
|
|
f" (Standard: {MODEL_SIZE})",
|
||
|
|
)
|
||
|
|
parser.add_argument(
|
||
|
|
"--no-llm",
|
||
|
|
action="store_true",
|
||
|
|
help="LLM-Korrektur ueberspringen (nur Whisper-Text ausgeben)",
|
||
|
|
)
|
||
|
|
args = parser.parse_args()
|
||
|
|
|
||
|
|
print("=" * 55)
|
||
|
|
print(" ReSpeaker XVF3800 -> Whisper + LLM-Korrektur")
|
||
|
|
print("=" * 55)
|
||
|
|
|
||
|
|
# Datei-Modus
|
||
|
|
if args.file:
|
||
|
|
if not os.path.isfile(args.file):
|
||
|
|
print(f"Datei nicht gefunden: {args.file}")
|
||
|
|
sys.exit(1)
|
||
|
|
text = transcribe_file(args.file, args.language, args.model)
|
||
|
|
if text:
|
||
|
|
print(f"\n=== FINALES ERGEBNIS ===\n{text}\n")
|
||
|
|
else:
|
||
|
|
print("Keine Sprache erkannt.")
|
||
|
|
return
|
||
|
|
|
||
|
|
# Live-Aufnahme-Modus
|
||
|
|
device_idx = find_respeaker_device()
|
||
|
|
if device_idx is None:
|
||
|
|
print("Kein ReSpeaker XVF3800 gefunden.")
|
||
|
|
sys.exit(1)
|
||
|
|
|
||
|
|
stopword_list = STOPWORDS.get(args.language, STOPWORDS["de"])
|
||
|
|
|
||
|
|
# Ansage
|
||
|
|
play_announcement("Aufnahme laeuft.", device_idx, args.language)
|
||
|
|
|
||
|
|
# Aufnehmen bis Stoppwort
|
||
|
|
audio = record_until_stopword(device_idx, args.language, stopword_list)
|
||
|
|
|
||
|
|
# WAV zwischenspeichern
|
||
|
|
tmp_wav = tempfile.NamedTemporaryFile(
|
||
|
|
suffix=".wav", delete=False, prefix="respeaker_"
|
||
|
|
)
|
||
|
|
save_wav(audio, tmp_wav.name)
|
||
|
|
print(f"Aufnahme gespeichert: {tmp_wav.name}\n")
|
||
|
|
|
||
|
|
# Whisper-Transkription
|
||
|
|
whisper_text = transcribe(audio, args.language, args.model)
|
||
|
|
|
||
|
|
# LLM-Korrektur
|
||
|
|
if whisper_text and not args.no_llm:
|
||
|
|
final_text = llm_correct(whisper_text, args.language)
|
||
|
|
else:
|
||
|
|
final_text = whisper_text
|
||
|
|
|
||
|
|
# Aufnahme NICHT loeschen — fuer spaetere Wiederverwendung
|
||
|
|
print(f"Aufnahme behalten: {tmp_wav.name}\n")
|
||
|
|
|
||
|
|
if final_text:
|
||
|
|
print(f"\n=== FINALES ERGEBNIS ===\n{final_text}\n")
|
||
|
|
print("Fertig!")
|
||
|
|
else:
|
||
|
|
print("Keine Sprache erkannt — versuche es mit lauterer Stimme.")
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == "__main__":
|
||
|
|
main()
|