call-to-text/audio/preprocessor.py
ed0ss 7f03949593 Первая версия: транскрипция звонков из Novofon DATA API в Directus
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2026-06-26 12:44:50 +03:00

88 lines
2.7 KiB
Python

import os
import shutil
import subprocess
import json
from typing import Optional
def _find_ffmpeg() -> str:
path = shutil.which("ffmpeg")
if path:
return path
winget_path = os.path.join(
os.environ.get("LOCALAPPDATA", ""),
"Microsoft", "WinGet", "Links", "ffmpeg.exe"
)
if os.path.exists(winget_path):
return winget_path
alt_paths = [
r"C:\ffmpeg\bin\ffmpeg.exe",
r"C:\Program Files\ffmpeg\bin\ffmpeg.exe",
]
for p in alt_paths:
if os.path.exists(p):
return p
raise RuntimeError("FFmpeg not found. Install it via: winget install ffmpeg")
def get_audio_channels(input_path: str) -> int:
ffmpeg_path = _find_ffmpeg()
cmd = [
ffmpeg_path, "-i", input_path,
"-f", "null", "-"
]
result = subprocess.run(cmd, capture_output=True, text=True)
stderr = result.stderr
for line in stderr.split("\n"):
if "Audio:" in line:
if "stereo" in line or "2 channels" in line:
return 2
elif "mono" in line or "1 channel" in line:
return 1
import re
m = re.search(r"(\d+)\s+channels?", line)
if m:
return int(m.group(1))
return 2
def convert_to_wav(input_path: str, output_dir: str, sample_rate: int = 16000) -> Optional[str]:
os.makedirs(output_dir, exist_ok=True)
base = os.path.splitext(os.path.basename(input_path))[0]
output_path = os.path.join(output_dir, f"{base}_16khz.wav")
channels = get_audio_channels(input_path)
ac = "2" if channels == 2 else "1"
ffmpeg_path = _find_ffmpeg()
cmd = [
ffmpeg_path, "-y",
"-i", input_path,
"-acodec", "pcm_s16le",
"-ac", ac,
"-ar", str(sample_rate),
output_path
]
result = subprocess.run(cmd, capture_output=True, text=True)
if result.returncode != 0:
raise RuntimeError(f"FFmpeg error: {result.stderr}")
return output_path, channels
def split_stereo_channels(wav_path: str, output_dir: str) -> tuple[Optional[str], Optional[str]]:
base = os.path.splitext(os.path.basename(wav_path))[0]
left_path = os.path.join(output_dir, f"{base}_left.wav")
right_path = os.path.join(output_dir, f"{base}_right.wav")
ffmpeg_path = _find_ffmpeg()
cmd = [
ffmpeg_path, "-y",
"-i", wav_path,
"-filter_complex", "[0:a]pan=mono|c0=c0[left];[0:a]pan=mono|c0=c1[right]",
"-map", "[left]", left_path,
"-map", "[right]", right_path,
]
result = subprocess.run(cmd, capture_output=True, text=True)
if result.returncode != 0:
raise RuntimeError(f"FFmpeg split error: {result.stderr}")
return left_path, right_path