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"""Post-processing service for audio mixing, mastering, and effects."""
import os
import asyncio
from pathlib import Path
from typing import Any, TYPE_CHECKING
import structlog
# Optional audio processing dependencies
try:
import numpy as np
import soundfile as sf
import librosa
AUDIO_LIBS_AVAILABLE = True
except ImportError:
AUDIO_LIBS_AVAILABLE = False
np = None
sf = None
librosa = None
# Create dummy types for type hints
if TYPE_CHECKING:
import numpy as np
from app.core.config import settings
logger = structlog.get_logger(__name__)
class PostProcessingService:
"""Service for post-processing audio (mixing, mastering, effects)."""
def __init__(self):
"""Initialize the post-processing service."""
self.logger = logger.bind(service="post_processing")
if not AUDIO_LIBS_AVAILABLE:
self.logger.warning("audio_libs_not_available",
message="numpy/soundfile/librosa not installed")
async def mix_audio(
self,
instrumental_path: Path,
vocal_path: Path,
output_path: Path,
vocal_volume: float = 0.7,
instrumental_volume: float = 0.8,
) -> Path:
"""
Mix instrumental and vocal tracks.
Args:
instrumental_path: Path to instrumental audio
vocal_path: Path to vocal audio
output_path: Path to save mixed audio
vocal_volume: Volume level for vocals (0.0-1.0)
instrumental_volume: Volume level for instrumental (0.0-1.0)
Returns:
Path to mixed audio file
"""
self.logger.info(
"mixing_audio",
instrumental=str(instrumental_path),
vocal=str(vocal_path),
)
if os.environ.get("FORCE_SIMULATION", "").lower() == "true" or not AUDIO_LIBS_AVAILABLE:
self.logger.warning("simulating_mixing", message="Simulation forced or audio libs missing")
import shutil
await asyncio.sleep(1)
output_path.parent.mkdir(parents=True, exist_ok=True)
shutil.copy(instrumental_path, output_path)
return output_path
def _process():
# Load audio files
instrumental, sr_inst = librosa.load(str(instrumental_path), sr=None)
vocal, sr_vocal = librosa.load(str(vocal_path), sr=None)
# Resample to common sample rate
target_sr = max(sr_inst, sr_vocal)
if sr_inst != target_sr:
instrumental = librosa.resample(instrumental, orig_sr=sr_inst, target_sr=target_sr)
if sr_vocal != target_sr:
vocal = librosa.resample(vocal, orig_sr=sr_vocal, target_sr=target_sr)
# Match lengths (pad shorter track)
max_len = max(len(instrumental), len(vocal))
instrumental = np.pad(
instrumental, (0, max_len - len(instrumental)), mode="constant"
)
vocal = np.pad(vocal, (0, max_len - len(vocal)), mode="constant")
# Apply volume adjustments
instrumental = instrumental * instrumental_volume
vocal = vocal * vocal_volume
# Mix tracks
mixed = instrumental + vocal
# Normalize to prevent clipping
max_val = np.abs(mixed).max()
if max_val > 1.0:
mixed = mixed / max_val
# Ensure output directory exists
output_path.parent.mkdir(parents=True, exist_ok=True)
# Save mixed audio
sf.write(str(output_path), mixed, target_sr)
return target_sr
await asyncio.to_thread(_process)
self.logger.info("audio_mixed", output_path=str(output_path))
return output_path
async def master_audio(
self,
audio_path: Path,
output_path: Path,
normalize: bool = True,
apply_compression: bool = True,
apply_eq: bool = True,
) -> Path:
"""
Master audio with compression, EQ, and normalization.
Args:
audio_path: Path to input audio
output_path: Path to save mastered audio
normalize: Apply normalization
apply_compression: Apply dynamic range compression
apply_eq: Apply equalization
Returns:
Path to mastered audio file
"""
self.logger.info("mastering_audio", input_path=str(audio_path))
if os.environ.get("FORCE_SIMULATION", "").lower() == "true" or not AUDIO_LIBS_AVAILABLE:
self.logger.warning("simulating_mastering", message="Simulation forced or audio libs missing")
import shutil
await asyncio.sleep(1)
output_path.parent.mkdir(parents=True, exist_ok=True)
shutil.copy(audio_path, output_path)
return output_path
def _process():
# Load audio
audio, sr = librosa.load(str(audio_path), sr=None)
# Apply compression (simple RMS-based compression)
if apply_compression:
audio = self._apply_compression(audio)
# Apply EQ (simple high-pass and low-pass filters)
if apply_eq:
audio = self._apply_eq(audio, sr)
# Normalize
if normalize:
audio = self._normalize(audio)
# Ensure output directory exists
output_path.parent.mkdir(parents=True, exist_ok=True)
# Save mastered audio
sf.write(str(output_path), audio, sr)
await asyncio.to_thread(_process)
self.logger.info("audio_mastered", output_path=str(output_path))
return output_path
def _apply_compression(self, audio: Any, threshold: float = 0.7, ratio: float = 4.0) -> Any:
"""Apply simple dynamic range compression."""
# Simple RMS-based compression
rms = np.sqrt(np.mean(audio**2))
if rms > threshold:
gain_reduction = (rms - threshold) / ratio
audio = audio * (1.0 - gain_reduction / rms)
return audio
def _apply_eq(self, audio: np.ndarray, sr: int) -> np.ndarray:
"""Apply simple equalization."""
# High-pass filter to remove low-frequency noise
audio = librosa.effects.preemphasis(audio)
return audio
def _normalize(self, audio: Any) -> Any:
"""Normalize audio to prevent clipping."""
max_val = np.abs(audio).max()
if max_val > 0:
audio = audio / max_val * 0.95 # Leave some headroom
return audio
async def add_reverb(
self,
audio_path: Path,
output_path: Path,
room_size: float = 0.5,
) -> Path:
"""Add reverb effect to audio."""
# Simple reverb using convolution (would use better reverb in production)
audio, sr = librosa.load(str(audio_path), sr=None)
# Create simple impulse response for reverb
impulse_length = int(sr * room_size)
impulse = np.random.randn(impulse_length) * 0.1
impulse = impulse * np.exp(-np.linspace(0, 5, impulse_length))
# Convolve with impulse response
reverb_audio = np.convolve(audio, impulse, mode="same")
# Mix original and reverb
output = audio + reverb_audio * 0.3
# Normalize
output = self._normalize(output)
output_path.parent.mkdir(parents=True, exist_ok=True)
sf.write(str(output_path), output, sr)
return output_path
# Singleton instance
_post_processing_service: PostProcessingService | None = None
def get_post_processing_service() -> PostProcessingService:
"""Get post-processing service instance."""
global _post_processing_service
if _post_processing_service is None:
_post_processing_service = PostProcessingService()
return _post_processing_service
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