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# audio_utils.py - Audio processing utilities
import logging
from typing import List, Optional
import os
import tempfile
from pydub import AudioSegment
from pydub.utils import which
logger = logging.getLogger(__name__)
class AudioProcessor:
def __init__(self):
self._check_dependencies()
def _check_dependencies(self):
"""Check if required audio processing tools are available."""
# Check for ffmpeg
if not which("ffmpeg"):
logger.warning("ffmpeg not found. Some audio operations may fail.")
def merge_and_convert_to_mp3(
self,
audio_files: List[str],
output_path: str
) -> Optional[str]:
"""
Merge multiple audio files and convert to MP3.
Args:
audio_files: List of paths to audio files to merge
output_path: Path for the output MP3 file
Returns:
Path to the merged MP3 file, or None if failed
"""
try:
if not audio_files:
logger.error("No audio files to merge")
return None
logger.info(f"Merging {len(audio_files)} audio files...")
# Start with empty audio
merged_audio = AudioSegment.empty()
for i, audio_file in enumerate(audio_files):
if not os.path.exists(audio_file):
logger.warning(f"Audio file not found: {audio_file}")
continue
try:
# Load audio segment
segment = AudioSegment.from_wav(audio_file)
# Add a small pause between segments (500ms)
if i > 0:
pause = AudioSegment.silent(duration=500)
merged_audio += pause
# Add the segment
merged_audio += segment
logger.info(f"Added segment {i+1}/{len(audio_files)}")
except Exception as e:
logger.error(f"Failed to process audio file {audio_file}: {e}")
continue
if len(merged_audio) == 0:
logger.error("No audio content to export")
return None
# Normalize audio levels
merged_audio = self._normalize_audio(merged_audio)
# Export as MP3
logger.info(f"Exporting to MP3: {output_path}")
merged_audio.export(
output_path,
format="mp3",
bitrate="128k",
parameters=["-q:a", "2"] # Good quality
)
# Verify the file was created
if os.path.exists(output_path) and os.path.getsize(output_path) > 0:
duration = len(merged_audio) / 1000.0 # Convert to seconds
logger.info(f"Successfully created MP3: {duration:.1f} seconds")
return output_path
else:
logger.error("Failed to create MP3 file")
return None
except Exception as e:
logger.error(f"Failed to merge audio files: {e}")
return None
def _normalize_audio(self, audio: AudioSegment) -> AudioSegment:
"""Normalize audio levels."""
try:
# Apply some basic audio processing
# Normalize to -6dB to avoid clipping
target_dBFS = -6.0
change_in_dBFS = target_dBFS - audio.dBFS
normalized_audio = audio.apply_gain(change_in_dBFS)
return normalized_audio
except Exception as e:
logger.warning(f"Failed to normalize audio: {e}")
return audio
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