feat: Implement sound normalization service and API endpoints

- Added SoundNormalizerService for normalizing audio files with support for one-pass and two-pass normalization methods.
- Introduced API endpoints for normalizing all sounds and specific sounds by ID, including support for force normalization and handling of already normalized sounds.
- Created comprehensive test suite for the sound normalizer service and its API endpoints, covering various scenarios including success, errors, and edge cases.
- Refactored sound scanning service to utilize SHA-256 for file hashing instead of MD5 for improved security.
- Enhanced logging and error handling throughout the sound normalization process.

app/api/v1/__init__.py

@@ -2,7 +2,7 @@
 
 from fastapi import APIRouter
 
-from app.api.v1 import auth, main, socket, sounds
+from app.api.v1 import auth, main, socket, sound_normalizer, sounds
 
 # V1 API router with v1 prefix
 api_router = APIRouter(prefix="/v1")
@@ -12,3 +12,4 @@ api_router.include_router(main.router, tags=["main"])
 api_router.include_router(auth.router, prefix="/auth", tags=["authentication"])
 api_router.include_router(socket.router, tags=["socket"])
 api_router.include_router(sounds.router, tags=["sounds"])
+api_router.include_router(sound_normalizer.router, tags=["sound-normalization"])

app/api/v1/sound_normalizer.py

@@ -0,0 +1,166 @@
+"""Sound normalization API endpoints."""
+
+from typing import Annotated
+
+from fastapi import APIRouter, Depends, HTTPException, Query, status
+from sqlmodel.ext.asyncio.session import AsyncSession
+
+from app.core.database import get_db
+from app.core.dependencies import get_current_active_user_flexible
+from app.models.user import User
+from app.services.sound_normalizer import NormalizationResults, SoundNormalizerService
+
+router = APIRouter(prefix="/sounds/normalize", tags=["sound-normalization"])
+
+
+async def get_sound_normalizer_service(
+    session: Annotated[AsyncSession, Depends(get_db)],
+) -> SoundNormalizerService:
+    """Get the sound normalizer service."""
+    return SoundNormalizerService(session)
+
+
+@router.post("/all")
+async def normalize_all_sounds(
+    current_user: Annotated[User, Depends(get_current_active_user_flexible)],
+    normalizer_service: Annotated[
+        SoundNormalizerService, Depends(get_sound_normalizer_service)
+    ],
+    force: bool = Query(
+        False, description="Force normalization of already normalized sounds"
+    ),
+    one_pass: bool | None = Query(
+        None, description="Use one-pass normalization (overrides config)"
+    ),
+) -> dict[str, NormalizationResults | str]:
+    """Normalize all unnormalized sounds."""
+    # Only allow admins to normalize sounds
+    if current_user.role not in ["admin", "superadmin"]:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Only administrators can normalize sounds",
+        )
+
+    try:
+        results = await normalizer_service.normalize_all_sounds(
+            force=force,
+            one_pass=one_pass,
+        )
+        return {
+            "message": "Sound normalization completed",
+            "results": results,
+        }
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to normalize sounds: {e!s}",
+        ) from e
+
+
+@router.post("/type/{sound_type}")
+async def normalize_sounds_by_type(
+    sound_type: str,
+    current_user: Annotated[User, Depends(get_current_active_user_flexible)],
+    normalizer_service: Annotated[
+        SoundNormalizerService, Depends(get_sound_normalizer_service)
+    ],
+    force: bool = Query(
+        False, description="Force normalization of already normalized sounds"
+    ),
+    one_pass: bool | None = Query(
+        None, description="Use one-pass normalization (overrides config)"
+    ),
+) -> dict[str, NormalizationResults | str]:
+    """Normalize all sounds of a specific type (SDB, TTS, EXT)."""
+    # Only allow admins to normalize sounds
+    if current_user.role not in ["admin", "superadmin"]:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Only administrators can normalize sounds",
+        )
+
+    # Validate sound type
+    valid_types = ["SDB", "TTS", "EXT"]
+    if sound_type not in valid_types:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail=f"Invalid sound type. Must be one of: {', '.join(valid_types)}",
+        )
+
+    try:
+        results = await normalizer_service.normalize_sounds_by_type(
+            sound_type=sound_type,
+            force=force,
+            one_pass=one_pass,
+        )
+        return {
+            "message": f"Normalization of {sound_type} sounds completed",
+            "results": results,
+        }
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to normalize {sound_type} sounds: {e!s}",
+        ) from e
+
+
+@router.post("/{sound_id}")
+async def normalize_sound_by_id(
+    sound_id: int,
+    current_user: Annotated[User, Depends(get_current_active_user_flexible)],
+    normalizer_service: Annotated[
+        SoundNormalizerService, Depends(get_sound_normalizer_service)
+    ],
+    force: bool = Query(
+        False, description="Force normalization of already normalized sound"
+    ),
+    one_pass: bool | None = Query(
+        None, description="Use one-pass normalization (overrides config)"
+    ),
+) -> dict[str, str]:
+    """Normalize a specific sound by ID."""
+    # Only allow admins to normalize sounds
+    if current_user.role not in ["admin", "superadmin"]:
+        raise HTTPException(
+            status_code=status.HTTP_403_FORBIDDEN,
+            detail="Only administrators can normalize sounds",
+        )
+
+    try:
+        # Get the sound
+        sound = await normalizer_service.sound_repo.get_by_id(sound_id)
+        if not sound:
+            raise HTTPException(
+                status_code=status.HTTP_404_NOT_FOUND,
+                detail=f"Sound with ID {sound_id} not found",
+            )
+
+        # Normalize the sound
+        result = await normalizer_service.normalize_sound(
+            sound=sound,
+            force=force,
+            one_pass=one_pass,
+        )
+
+        # Check result status
+        if result["status"] == "error":
+            raise HTTPException(
+                status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+                detail=f"Failed to normalize sound: {result['error']}",
+            )
+
+        return {
+            "message": f"Sound normalization {result['status']}: {sound.filename}",
+            "status": result["status"],
+            "reason": result["reason"] or "",
+            "normalized_filename": result["normalized_filename"] or "",
+        }
+
+    except HTTPException:
+        # Re-raise HTTPExceptions without wrapping them
+        raise
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to normalize sound: {e!s}",
+        ) from e

app/core/config.py

@@ -47,5 +47,10 @@ class Settings(BaseSettings):
     GITHUB_CLIENT_ID: str = ""
     GITHUB_CLIENT_SECRET: str = ""
 
+    # Audio Normalization Configuration
+    NORMALIZED_AUDIO_FORMAT: str = "mp3"
+    NORMALIZED_AUDIO_BITRATE: str = "256k"
+    NORMALIZED_AUDIO_PASSES: int = 2  # 1 for one-pass, 2 for two-pass
+
 
 settings = Settings()

app/repositories/sound.py

@@ -126,3 +126,26 @@ class SoundRepository:
         except Exception:
             logger.exception("Failed to get popular sounds")
             raise
+
+    async def get_unnormalized_sounds(self) -> list[Sound]:
+        """Get all sounds that haven't been normalized yet."""
+        try:
+            statement = select(Sound).where(Sound.is_normalized == False)  # noqa: E712
+            result = await self.session.exec(statement)
+            return list(result.all())
+        except Exception:
+            logger.exception("Failed to get unnormalized sounds")
+            raise
+
+    async def get_unnormalized_sounds_by_type(self, sound_type: str) -> list[Sound]:
+        """Get unnormalized sounds by type."""
+        try:
+            statement = select(Sound).where(
+                Sound.type == sound_type,
+                Sound.is_normalized == False,  # noqa: E712
+            )
+            result = await self.session.exec(statement)
+            return list(result.all())
+        except Exception:
+            logger.exception("Failed to get unnormalized sounds by type: %s", sound_type)
+            raise

app/services/sound_normalizer.py

@@ -0,0 +1,567 @@
+"""Sound normalizer service for normalizing audio files using ffmpeg loudnorm."""
+
+import hashlib
+import json
+import os
+import re
+from pathlib import Path
+from typing import TypedDict
+
+import ffmpeg  # type: ignore[import-untyped]
+from sqlmodel.ext.asyncio.session import AsyncSession
+
+from app.core.config import settings
+from app.core.logging import get_logger
+from app.models.sound import Sound
+from app.repositories.sound import SoundRepository
+
+logger = get_logger(__name__)
+
+
+class NormalizationInfo(TypedDict):
+    """Type definition for normalization information in results."""
+
+    filename: str
+    status: str
+    reason: str | None
+    original_path: str | None
+    normalized_path: str | None
+    normalized_filename: str | None
+    normalized_duration: int | None
+    normalized_size: int | None
+    normalized_hash: str | None
+    id: int | None
+    error: str | None
+
+
+class NormalizationResults(TypedDict):
+    """Type definition for normalization results."""
+
+    processed: int
+    normalized: int
+    skipped: int
+    errors: int
+    files: list[NormalizationInfo]
+
+
+class SoundNormalizerService:
+    """Service for normalizing audio files using ffmpeg loudnorm."""
+
+    def __init__(self, session: AsyncSession) -> None:
+        """Initialize the sound normalizer service."""
+        self.session = session
+        self.sound_repo = SoundRepository(session)
+
+        # Normalization settings from config
+        self.output_format = settings.NORMALIZED_AUDIO_FORMAT
+        self.output_bitrate = settings.NORMALIZED_AUDIO_BITRATE
+        self.passes = settings.NORMALIZED_AUDIO_PASSES
+
+        # Directory mappings for different sound types
+        self.type_directories = {
+            "SDB": "sounds/normalized/soundboard",
+            "TTS": "sounds/normalized/text_to_speech",
+            "EXT": "sounds/normalized/extracted",
+        }
+
+        # Ensure normalized directories exist
+        self._ensure_directories()
+
+    def _ensure_directories(self) -> None:
+        """Ensure all normalized sound directories exist."""
+        for directory in self.type_directories.values():
+            Path(directory).mkdir(parents=True, exist_ok=True)
+            logger.debug("Ensured directory exists: %s", directory)
+
+    def _get_normalized_path(self, sound: Sound) -> Path:
+        """Get the normalized file path for a sound."""
+        return self._get_normalized_path_from_data(sound.type, sound.filename)
+
+    def _get_normalized_path_from_data(self, sound_type: str, filename: str) -> Path:
+        """Get the normalized file path from sound data."""
+        # Get the appropriate directory for the sound type
+        directory = self.type_directories.get(sound_type, "sounds/normalized/other")
+
+        # Create the directory if it doesn't exist
+        Path(directory).mkdir(parents=True, exist_ok=True)
+
+        # Generate filename: original_name.{format}
+        original_stem = Path(filename).stem
+        normalized_filename = f"{original_stem}.{self.output_format}"
+
+        return Path(directory) / normalized_filename
+
+    def _get_original_path(self, sound: Sound) -> Path:
+        """Get the original file path for a sound."""
+        return self._get_original_path_from_data(sound.type, sound.filename)
+
+    def _get_original_path_from_data(self, sound_type: str, filename: str) -> Path:
+        """Get the original file path from sound data."""
+        # Map sound types to their original directories
+        type_to_original_dir = {
+            "SDB": "sounds/originals/soundboard",
+            "TTS": "sounds/originals/text_to_speech",
+            "EXT": "sounds/originals/extracted",
+        }
+
+        original_dir = type_to_original_dir.get(sound_type, "sounds/originals/other")
+        return Path(original_dir) / filename
+
+    def _get_file_hash(self, file_path: Path) -> str:
+        """Calculate SHA-256 hash of a file."""
+        hash_sha256 = hashlib.sha256()
+        with open(file_path, "rb") as f:
+            for chunk in iter(lambda: f.read(4096), b""):
+                hash_sha256.update(chunk)
+        return hash_sha256.hexdigest()
+
+    def _get_file_size(self, file_path: Path) -> int:
+        """Get file size in bytes."""
+        return file_path.stat().st_size
+
+    def _get_audio_duration(self, file_path: Path) -> int:
+        """Get audio duration in milliseconds using ffmpeg."""
+        try:
+            probe = ffmpeg.probe(str(file_path))
+            duration = float(probe["format"]["duration"])
+            return int(duration * 1000)  # Convert to milliseconds
+        except Exception as e:
+            logger.warning("Failed to get duration for %s: %s", file_path, e)
+            return 0
+
+    async def _normalize_audio_one_pass(
+        self,
+        input_path: Path,
+        output_path: Path,
+    ) -> None:
+        """Normalize audio using one-pass loudnorm."""
+        try:
+            logger.info(
+                "Starting one-pass normalization: %s -> %s",
+                input_path,
+                output_path,
+            )
+
+            stream = ffmpeg.input(str(input_path))
+            stream = ffmpeg.filter(stream, "loudnorm", I=-23, TP=-2, LRA=7)
+
+            # Apply output format and bitrate
+            output_args = {}
+            if self.output_format == "mp3":
+                output_args["acodec"] = "libmp3lame"
+                output_args["audio_bitrate"] = self.output_bitrate
+            elif self.output_format == "aac":
+                output_args["acodec"] = "aac"
+                output_args["audio_bitrate"] = self.output_bitrate
+            elif self.output_format == "opus":
+                output_args["acodec"] = "libopus"
+                output_args["audio_bitrate"] = self.output_bitrate
+
+            stream = ffmpeg.output(stream, str(output_path), **output_args)
+            stream = ffmpeg.overwrite_output(stream)
+
+            ffmpeg.run(stream, quiet=True, overwrite_output=True)
+            logger.info("One-pass normalization completed: %s", output_path)
+
+        except Exception as e:
+            logger.exception("One-pass normalization failed for %s", input_path)
+            raise
+
+    async def _normalize_audio_two_pass(
+        self,
+        input_path: Path,
+        output_path: Path,
+    ) -> None:
+        """Normalize audio using two-pass loudnorm for better quality."""
+        try:
+            logger.info(
+                "Starting two-pass normalization: %s -> %s", input_path, output_path
+            )
+
+            # First pass: analyze
+            logger.debug("First pass: analyzing %s", input_path)
+
+            stream = ffmpeg.input(str(input_path))
+            stream = ffmpeg.filter(
+                stream,
+                "loudnorm",
+                I=-23,
+                TP=-2,
+                LRA=7,
+                print_format="json",
+            )
+            # Output to null device with explicit format
+            null_output = "/dev/null" if os.name != "nt" else "NUL"
+            stream = ffmpeg.output(stream, null_output, format="null")
+
+            # Run first pass and capture output
+            try:
+                result = ffmpeg.run(stream, capture_stderr=True, quiet=True)
+                analysis_output = result[1].decode("utf-8")
+            except ffmpeg.Error as e:
+                logger.error("FFmpeg first pass failed for %s. Stdout: %s, Stderr: %s", 
+                           input_path, e.stdout.decode() if e.stdout else "None", 
+                           e.stderr.decode() if e.stderr else "None")
+                raise
+
+            # Extract loudnorm measurements from the output
+            # The JSON output is at the end of stderr
+            logger.debug("Loudnorm analysis output: %s", analysis_output)
+
+            # Find JSON in the output
+            json_match = re.search(r'\{[^{}]*"input_i"[^{}]*\}', analysis_output)
+            if not json_match:
+                logger.error("Could not find JSON in loudnorm output: %s", analysis_output)
+                raise ValueError("Could not extract loudnorm analysis data")
+
+            logger.debug("Found JSON match: %s", json_match.group())
+            analysis_data = json.loads(json_match.group())
+
+            # Second pass: normalize with measured values
+            logger.debug("Second pass: normalizing %s with measured values", input_path)
+
+            stream = ffmpeg.input(str(input_path))
+            stream = ffmpeg.filter(
+                stream,
+                "loudnorm",
+                measured_I=analysis_data["input_i"],
+                measured_LRA=analysis_data["input_lra"],
+                measured_TP=analysis_data["input_tp"],
+                measured_thresh=analysis_data["input_thresh"],
+                offset=analysis_data["target_offset"],
+            )
+
+            # Apply output format and bitrate
+            output_args = {}
+            if self.output_format == "mp3":
+                output_args["acodec"] = "libmp3lame"
+                output_args["audio_bitrate"] = self.output_bitrate
+            elif self.output_format == "aac":
+                output_args["acodec"] = "aac"
+                output_args["audio_bitrate"] = self.output_bitrate
+            elif self.output_format == "opus":
+                output_args["acodec"] = "libopus"
+                output_args["audio_bitrate"] = self.output_bitrate
+
+            stream = ffmpeg.output(stream, str(output_path), **output_args)
+            stream = ffmpeg.overwrite_output(stream)
+
+            try:
+                ffmpeg.run(stream, quiet=True, overwrite_output=True)
+                logger.info("Two-pass normalization completed: %s", output_path)
+            except ffmpeg.Error as e:
+                logger.error("FFmpeg second pass failed for %s. Stdout: %s, Stderr: %s", 
+                           input_path, e.stdout.decode() if e.stdout else "None", 
+                           e.stderr.decode() if e.stderr else "None")
+                raise
+
+        except Exception as e:
+            logger.exception("Two-pass normalization failed for %s", input_path)
+            raise
+
+    async def normalize_sound(
+        self,
+        sound: Sound,
+        force: bool = False,
+        one_pass: bool | None = None,
+        sound_data: dict | None = None,
+    ) -> NormalizationInfo:
+        """Normalize a single sound."""
+        # Use provided sound_data to avoid detached instance issues, or capture from sound
+        if sound_data:
+            filename = sound_data["filename"]
+            sound_id = sound_data["id"]
+            is_normalized = sound_data["is_normalized"]
+            sound_type = sound_data["type"]
+        else:
+            # Fallback to accessing sound properties (for single sound normalization)
+            filename = sound.filename
+            sound_id = sound.id
+            is_normalized = sound.is_normalized
+            sound_type = sound.type
+
+        # Check if already normalized and not forcing
+        if is_normalized and not force:
+            return {
+                "filename": filename,
+                "status": "skipped",
+                "reason": "already normalized",
+                "original_path": None,
+                "normalized_path": None,
+                "normalized_filename": None,
+                "normalized_duration": None,
+                "normalized_size": None,
+                "normalized_hash": None,
+                "id": sound_id,
+                "error": None,
+            }
+
+        try:
+            # Get paths using captured data to avoid accessing sound properties
+            original_path = self._get_original_path_from_data(sound_type, filename)
+            normalized_path = self._get_normalized_path_from_data(sound_type, filename)
+
+            # Check if original file exists
+            if not original_path.exists():
+                error_msg = f"Original file not found: {original_path}"
+                logger.error(error_msg)
+                return {
+                    "filename": filename,
+                    "status": "error",
+                    "reason": None,
+                    "original_path": str(original_path),
+                    "normalized_path": None,
+                    "normalized_filename": None,
+                    "normalized_duration": None,
+                    "normalized_size": None,
+                    "normalized_hash": None,
+                    "id": sound_id,
+                    "error": error_msg,
+                }
+
+            # Determine which normalization method to use
+            use_one_pass = one_pass if one_pass is not None else (self.passes == 1)
+
+            # Perform normalization
+            if use_one_pass:
+                await self._normalize_audio_one_pass(original_path, normalized_path)
+            else:
+                await self._normalize_audio_two_pass(original_path, normalized_path)
+
+            # Get normalized file info
+            normalized_duration = self._get_audio_duration(normalized_path)
+            normalized_size = self._get_file_size(normalized_path)
+            normalized_hash = self._get_file_hash(normalized_path)
+            normalized_filename = normalized_path.name
+
+            # Update sound in database
+            update_data = {
+                "normalized_filename": normalized_filename,
+                "normalized_duration": normalized_duration,
+                "normalized_size": normalized_size,
+                "normalized_hash": normalized_hash,
+                "is_normalized": True,
+            }
+
+            await self.sound_repo.update(sound, update_data)
+            logger.info("Normalized sound: %s -> %s", filename, normalized_filename)
+
+            return {
+                "filename": filename,
+                "status": "normalized",
+                "reason": None,
+                "original_path": str(original_path),
+                "normalized_path": str(normalized_path),
+                "normalized_filename": normalized_filename,
+                "normalized_duration": normalized_duration,
+                "normalized_size": normalized_size,
+                "normalized_hash": normalized_hash,
+                "id": sound_id,
+                "error": None,
+            }
+
+        except Exception as e:
+            error_msg = str(e)
+            logger.exception(
+                "Failed to normalize sound %s",
+                filename,
+            )
+            return {
+                "filename": filename,
+                "status": "error",
+                "reason": None,
+                "original_path": (
+                    str(original_path) if "original_path" in locals() else None
+                ),
+                "normalized_path": (
+                    str(normalized_path) if "normalized_path" in locals() else None
+                ),
+                "normalized_filename": None,
+                "normalized_duration": None,
+                "normalized_size": None,
+                "normalized_hash": None,
+                "id": sound_id,
+                "error": error_msg,
+            }
+
+    async def normalize_all_sounds(
+        self,
+        force: bool = False,
+        one_pass: bool | None = None,
+    ) -> NormalizationResults:
+        """Normalize all unnormalized sounds."""
+        logger.info("Starting normalization of all sounds")
+
+        results: NormalizationResults = {
+            "processed": 0,
+            "normalized": 0,
+            "skipped": 0,
+            "errors": 0,
+            "files": [],
+        }
+
+        # Get sounds to normalize
+        if force:
+            # Get all sounds if forcing
+            sounds = []
+            for sound_type in self.type_directories.keys():
+                type_sounds = await self.sound_repo.get_by_type(sound_type)
+                sounds.extend(type_sounds)
+        else:
+            # Get only unnormalized sounds
+            sounds = await self.sound_repo.get_unnormalized_sounds()
+
+        logger.info("Found %d sounds to process", len(sounds))
+
+        # Capture all sound data upfront to avoid session detachment issues
+        sound_data_list = []
+        for sound in sounds:
+            sound_data_list.append(
+                {
+                    "id": sound.id,
+                    "filename": sound.filename,
+                    "type": sound.type,
+                    "is_normalized": sound.is_normalized,
+                    "name": sound.name,
+                }
+            )
+
+        # Process each sound using captured data
+        for i, sound in enumerate(sounds):
+            results["processed"] += 1
+
+            # Use captured data to avoid detached instance issues
+            sound_data = sound_data_list[i]
+            sound_id = sound_data["id"]
+            sound_filename = sound_data["filename"]
+
+            try:
+                normalization_info = await self.normalize_sound(
+                    sound,
+                    force=force,
+                    one_pass=one_pass,
+                    sound_data=sound_data,
+                )
+
+                results["files"].append(normalization_info)
+
+                if normalization_info["status"] == "normalized":
+                    results["normalized"] += 1
+                elif normalization_info["status"] == "skipped":
+                    results["skipped"] += 1
+                elif normalization_info["status"] == "error":
+                    results["errors"] += 1
+
+            except Exception as e:
+                logger.exception(
+                    "Unexpected error processing sound %s",
+                    sound_filename,
+                )
+                results["errors"] += 1
+                results["files"].append(
+                    {
+                        "filename": sound_filename,
+                        "status": "error",
+                        "reason": None,
+                        "original_path": None,
+                        "normalized_path": None,
+                        "normalized_filename": None,
+                        "normalized_duration": None,
+                        "normalized_size": None,
+                        "normalized_hash": None,
+                        "id": sound_id,
+                        "error": str(e),
+                    }
+                )
+
+        logger.info("Normalization completed: %s", results)
+        return results
+
+    async def normalize_sounds_by_type(
+        self,
+        sound_type: str,
+        force: bool = False,
+        one_pass: bool | None = None,
+    ) -> NormalizationResults:
+        """Normalize all sounds of a specific type."""
+        logger.info("Starting normalization of %s sounds", sound_type)
+
+        results: NormalizationResults = {
+            "processed": 0,
+            "normalized": 0,
+            "skipped": 0,
+            "errors": 0,
+            "files": [],
+        }
+
+        # Get sounds to normalize
+        if force:
+            sounds = await self.sound_repo.get_by_type(sound_type)
+        else:
+            sounds = await self.sound_repo.get_unnormalized_sounds_by_type(sound_type)
+
+        logger.info("Found %d %s sounds to process", len(sounds), sound_type)
+
+        # Capture all sound data upfront to avoid session detachment issues
+        sound_data_list = []
+        for sound in sounds:
+            sound_data_list.append(
+                {
+                    "id": sound.id,
+                    "filename": sound.filename,
+                    "type": sound.type,
+                    "is_normalized": sound.is_normalized,
+                    "name": sound.name,
+                }
+            )
+
+        # Process each sound using captured data
+        for i, sound in enumerate(sounds):
+            results["processed"] += 1
+
+            # Use captured data to avoid detached instance issues
+            sound_data = sound_data_list[i]
+            sound_id = sound_data["id"]
+            sound_filename = sound_data["filename"]
+
+            try:
+                normalization_info = await self.normalize_sound(
+                    sound,
+                    force=force,
+                    one_pass=one_pass,
+                    sound_data=sound_data,
+                )
+
+                results["files"].append(normalization_info)
+
+                if normalization_info["status"] == "normalized":
+                    results["normalized"] += 1
+                elif normalization_info["status"] == "skipped":
+                    results["skipped"] += 1
+                elif normalization_info["status"] == "error":
+                    results["errors"] += 1
+
+            except Exception as e:
+                logger.exception(
+                    "Unexpected error processing sound %s",
+                    sound_filename,
+                )
+                results["errors"] += 1
+                results["files"].append(
+                    {
+                        "filename": sound_filename,
+                        "status": "error",
+                        "reason": None,
+                        "original_path": None,
+                        "normalized_path": None,
+                        "normalized_filename": None,
+                        "normalized_duration": None,
+                        "normalized_size": None,
+                        "normalized_hash": None,
+                        "id": sound_id,
+                        "error": str(e),
+                    }
+                )
+
+        logger.info("Type normalization completed: %s", results)
+        return results

app/services/sound_scanner.py

@@ -16,6 +16,7 @@ logger = get_logger(__name__)
 
 class FileInfo(TypedDict):
     """Type definition for file information in scan results."""
+
     filename: str
     status: str
     reason: str | None
@@ -29,6 +30,7 @@ class FileInfo(TypedDict):
 
 class ScanResults(TypedDict):
     """Type definition for scan results."""
+
     scanned: int
     added: int
     updated: int
@@ -45,15 +47,23 @@ class SoundScannerService:
         """Initialize the sound scanner service."""
         self.session = session
         self.sound_repo = SoundRepository(session)
-        self.supported_extensions = {".mp3", ".wav", ".opus", ".flac", ".ogg", ".m4a", ".aac"}
+        self.supported_extensions = {
+            ".mp3",
+            ".wav",
+            ".opus",
+            ".flac",
+            ".ogg",
+            ".m4a",
+            ".aac",
+        }
 
     def get_file_hash(self, file_path: Path) -> str:
-        """Calculate MD5 hash of a file."""
-        hash_md5 = hashlib.md5()
+        """Calculate SHA-256 hash of a file."""
+        hash_sha256 = hashlib.sha256()
         with open(file_path, "rb") as f:
             for chunk in iter(lambda: f.read(4096), b""):
-                hash_md5.update(chunk)
-        return hash_md5.hexdigest()
+                hash_sha256.update(chunk)
+        return hash_sha256.hexdigest()
 
     def get_audio_duration(self, file_path: Path) -> int:
         """Get audio duration in milliseconds using ffmpeg."""
@@ -76,8 +86,7 @@ class SoundScannerService:
         # Replace underscores and hyphens with spaces
         name = name.replace("_", " ").replace("-", " ")
         # Capitalize words
-        name = " ".join(word.capitalize() for word in name.split())
-        return name
+        return " ".join(word.capitalize() for word in name.split())
 
     async def scan_directory(
         self,
@@ -113,7 +122,8 @@ class SoundScannerService:
 
         # Get all audio files from directory
         audio_files = [
-            f for f in scan_path.iterdir()
+            f
+            for f in scan_path.iterdir()
             if f.is_file() and f.suffix.lower() in self.supported_extensions
         ]
 
@@ -134,7 +144,8 @@ class SoundScannerService:
             except Exception as e:
                 logger.exception("Error processing file %s", file_path)
                 results["errors"] += 1
-                results["files"].append({
+                results["files"].append(
+                    {
                         "filename": filename,
                         "status": "error",
                         "reason": None,
@@ -144,7 +155,8 @@ class SoundScannerService:
                         "id": None,
                         "error": str(e),
                         "changes": None,
-                })
+                    }
+                )
 
         # Delete sounds that no longer exist in directory
         for filename, sound in sounds_by_filename.items():
@@ -153,7 +165,8 @@ class SoundScannerService:
                     await self.sound_repo.delete(sound)
                     logger.info("Deleted sound no longer in directory: %s", filename)
                     results["deleted"] += 1
-                    results["files"].append({
+                    results["files"].append(
+                        {
                             "filename": filename,
                             "status": "deleted",
                             "reason": "file no longer exists",
@@ -163,11 +176,13 @@ class SoundScannerService:
                             "id": sound.id,
                             "error": None,
                             "changes": None,
-                    })
+                        }
+                    )
                 except Exception as e:
                     logger.exception("Error deleting sound %s", filename)
                     results["errors"] += 1
-                    results["files"].append({
+                    results["files"].append(
+                        {
                             "filename": filename,
                             "status": "error",
                             "reason": "failed to delete",
@@ -177,7 +192,8 @@ class SoundScannerService:
                             "id": sound.id,
                             "error": str(e),
                             "changes": None,
-                    })
+                        }
+                    )
 
         logger.info("Sync completed: %s", results)
         return results
@@ -215,7 +231,8 @@ class SoundScannerService:
             logger.info("Added new sound: %s (ID: %s)", sound.name, sound.id)
 
             results["added"] += 1
-            results["files"].append({
+            results["files"].append(
+                {
                     "filename": filename,
                     "status": "added",
                     "reason": None,
@@ -225,7 +242,8 @@ class SoundScannerService:
                     "id": sound.id,
                     "error": None,
                     "changes": None,
-            })
+                }
+            )
 
         elif existing_sound.hash != file_hash:
             # Update existing sound (file was modified)
@@ -240,7 +258,8 @@ class SoundScannerService:
             logger.info("Updated modified sound: %s (ID: %s)", name, existing_sound.id)
 
             results["updated"] += 1
-            results["files"].append({
+            results["files"].append(
+                {
                     "filename": filename,
                     "status": "updated",
                     "reason": "file was modified",
@@ -250,13 +269,15 @@ class SoundScannerService:
                     "id": existing_sound.id,
                     "error": None,
                     "changes": ["hash", "duration", "size", "name"],
-            })
+                }
+            )
 
         else:
             # File unchanged, skip
             logger.debug("Sound unchanged: %s", filename)
             results["skipped"] += 1
-            results["files"].append({
+            results["files"].append(
+                {
                     "filename": filename,
                     "status": "skipped",
                     "reason": "file unchanged",
@@ -266,7 +287,8 @@ class SoundScannerService:
                     "id": existing_sound.id,
                     "error": None,
                     "changes": None,
-            })
+                }
+            )
 
     async def scan_soundboard_directory(self) -> ScanResults:
         """Sync the default soundboard directory."""

tests/api/v1/test_sound_normalizer_endpoints.py

@@ -0,0 +1,613 @@
+"""Tests for sound normalizer API endpoints."""
+
+from unittest.mock import patch
+
+import pytest
+from httpx import ASGITransport, AsyncClient
+
+from app.models.user import User
+from app.services.sound_normalizer import NormalizationResults
+
+
+class TestSoundNormalizerEndpoints:
+    """Test sound normalizer API endpoints."""
+
+    @pytest.mark.asyncio
+    async def test_normalize_all_sounds_success(
+        self,
+        authenticated_admin_client: AsyncClient,
+        admin_user: User,
+    ):
+        """Test successful normalization of all sounds."""
+        mock_results: NormalizationResults = {
+            "processed": 3,
+            "normalized": 2,
+            "skipped": 1,
+            "errors": 0,
+            "files": [
+                {
+                    "filename": "test1.mp3",
+                    "status": "normalized",
+                    "reason": None,
+                    "original_path": "/fake/test1.mp3",
+                    "normalized_path": "/fake/test1_normalized.mp3",
+                    "normalized_filename": "test1_normalized.mp3",
+                    "normalized_duration": 5000,
+                    "normalized_size": 1024,
+                    "normalized_hash": "norm_hash1",
+                    "id": 1,
+                    "error": None,
+                },
+                {
+                    "filename": "test2.wav",
+                    "status": "normalized",
+                    "reason": None,
+                    "original_path": "/fake/test2.wav",
+                    "normalized_path": "/fake/test2_normalized.mp3",
+                    "normalized_filename": "test2_normalized.mp3",
+                    "normalized_duration": 7000,
+                    "normalized_size": 2048,
+                    "normalized_hash": "norm_hash2",
+                    "id": 2,
+                    "error": None,
+                },
+                {
+                    "filename": "test3.mp3",
+                    "status": "skipped",
+                    "reason": "already normalized",
+                    "original_path": None,
+                    "normalized_path": None,
+                    "normalized_filename": None,
+                    "normalized_duration": None,
+                    "normalized_size": None,
+                    "normalized_hash": None,
+                    "id": 3,
+                    "error": None,
+                },
+            ],
+        }
+
+        with patch(
+            "app.services.sound_normalizer.SoundNormalizerService.normalize_all_sounds"
+        ) as mock_normalize:
+            mock_normalize.return_value = mock_results
+
+            response = await authenticated_admin_client.post(
+                "/api/v1/sounds/normalize/all"
+            )
+
+            assert response.status_code == 200
+            data = response.json()
+
+            assert "message" in data
+            assert "Sound normalization completed" in data["message"]
+            assert "results" in data
+
+            results = data["results"]
+            assert results["processed"] == 3
+            assert results["normalized"] == 2
+            assert results["skipped"] == 1
+            assert results["errors"] == 0
+            assert len(results["files"]) == 3
+
+    @pytest.mark.asyncio
+    async def test_normalize_all_sounds_with_force(
+        self,
+        authenticated_admin_client: AsyncClient,
+        admin_user: User,
+    ):
+        """Test normalization with force parameter."""
+        mock_results: NormalizationResults = {
+            "processed": 1,
+            "normalized": 1,
+            "skipped": 0,
+            "errors": 0,
+            "files": [],
+        }
+
+        with patch(
+            "app.services.sound_normalizer.SoundNormalizerService.normalize_all_sounds"
+        ) as mock_normalize:
+            mock_normalize.return_value = mock_results
+
+            response = await authenticated_admin_client.post(
+                "/api/v1/sounds/normalize/all", params={"force": True}
+            )
+
+            assert response.status_code == 200
+
+            # Verify force parameter was passed
+            mock_normalize.assert_called_once_with(force=True, one_pass=None)
+
+    @pytest.mark.asyncio
+    async def test_normalize_all_sounds_with_one_pass(
+        self,
+        authenticated_admin_client: AsyncClient,
+        admin_user: User,
+    ):
+        """Test normalization with one_pass parameter."""
+        mock_results: NormalizationResults = {
+            "processed": 1,
+            "normalized": 1,
+            "skipped": 0,
+            "errors": 0,
+            "files": [],
+        }
+
+        with patch(
+            "app.services.sound_normalizer.SoundNormalizerService.normalize_all_sounds"
+        ) as mock_normalize:
+            mock_normalize.return_value = mock_results
+
+            response = await authenticated_admin_client.post(
+                "/api/v1/sounds/normalize/all", params={"one_pass": True}
+            )
+
+            assert response.status_code == 200
+
+            # Verify one_pass parameter was passed
+            mock_normalize.assert_called_once_with(force=False, one_pass=True)
+
+    @pytest.mark.asyncio
+    async def test_normalize_all_sounds_unauthenticated(self, client: AsyncClient):
+        """Test normalizing sounds without authentication."""
+        response = await client.post("/api/v1/sounds/normalize/all")
+
+        assert response.status_code == 401
+        data = response.json()
+        assert "Could not validate credentials" in data["detail"]
+
+    @pytest.mark.asyncio
+    async def test_normalize_all_sounds_non_admin(
+        self,
+        test_app,
+        test_user: User,
+    ):
+        """Test normalizing sounds with non-admin user."""
+        from app.core.dependencies import get_current_active_user_flexible
+
+        # Override the dependency to return regular user
+        async def override_get_current_user():
+            test_user.role = "user"
+            return test_user
+
+        test_app.dependency_overrides[get_current_active_user_flexible] = (
+            override_get_current_user
+        )
+
+        headers = {"API-TOKEN": "test_api_token"}
+
+        async with AsyncClient(
+            transport=ASGITransport(app=test_app),
+            base_url="http://test",
+        ) as client:
+            response = await client.post(
+                "/api/v1/sounds/normalize/all", headers=headers
+            )
+
+            assert response.status_code == 403
+            data = response.json()
+            assert "Only administrators can normalize sounds" in data["detail"]
+
+        # Clean up override
+        test_app.dependency_overrides.pop(get_current_active_user_flexible, None)
+
+    @pytest.mark.asyncio
+    async def test_normalize_all_sounds_service_error(
+        self,
+        authenticated_admin_client: AsyncClient,
+        admin_user: User,
+    ):
+        """Test normalization when service raises an error."""
+        with patch(
+            "app.services.sound_normalizer.SoundNormalizerService.normalize_all_sounds"
+        ) as mock_normalize:
+            mock_normalize.side_effect = Exception("Normalization service failed")
+
+            response = await authenticated_admin_client.post(
+                "/api/v1/sounds/normalize/all"
+            )
+
+            assert response.status_code == 500
+            data = response.json()
+            assert "Failed to normalize sounds" in data["detail"]
+            assert "Normalization service failed" in data["detail"]
+
+    @pytest.mark.asyncio
+    async def test_normalize_sounds_by_type_success(
+        self,
+        authenticated_admin_client: AsyncClient,
+        admin_user: User,
+    ):
+        """Test successful normalization by sound type."""
+        mock_results: NormalizationResults = {
+            "processed": 2,
+            "normalized": 2,
+            "skipped": 0,
+            "errors": 0,
+            "files": [
+                {
+                    "filename": "sdb1.mp3",
+                    "status": "normalized",
+                    "reason": None,
+                    "original_path": "/fake/sdb1.mp3",
+                    "normalized_path": "/fake/sdb1_normalized.mp3",
+                    "normalized_filename": "sdb1_normalized.mp3",
+                    "normalized_duration": 4000,
+                    "normalized_size": 800,
+                    "normalized_hash": "sdb_hash1",
+                    "id": 10,
+                    "error": None,
+                },
+                {
+                    "filename": "sdb2.wav",
+                    "status": "normalized",
+                    "reason": None,
+                    "original_path": "/fake/sdb2.wav",
+                    "normalized_path": "/fake/sdb2_normalized.mp3",
+                    "normalized_filename": "sdb2_normalized.mp3",
+                    "normalized_duration": 6000,
+                    "normalized_size": 1200,
+                    "normalized_hash": "sdb_hash2",
+                    "id": 11,
+                    "error": None,
+                },
+            ],
+        }
+
+        with patch(
+            "app.services.sound_normalizer.SoundNormalizerService.normalize_sounds_by_type"
+        ) as mock_normalize:
+            mock_normalize.return_value = mock_results
+
+            response = await authenticated_admin_client.post(
+                "/api/v1/sounds/normalize/type/SDB"
+            )
+
+            assert response.status_code == 200
+            data = response.json()
+
+            assert "Normalization of SDB sounds completed" in data["message"]
+            assert "results" in data
+
+            results = data["results"]
+            assert results["processed"] == 2
+            assert results["normalized"] == 2
+            assert len(results["files"]) == 2
+
+            # Verify the service was called with correct type
+            mock_normalize.assert_called_once_with(
+                sound_type="SDB", force=False, one_pass=None
+            )
+
+    @pytest.mark.asyncio
+    async def test_normalize_sounds_by_type_invalid_type(
+        self,
+        authenticated_admin_client: AsyncClient,
+        admin_user: User,
+    ):
+        """Test normalization with invalid sound type."""
+        response = await authenticated_admin_client.post(
+            "/api/v1/sounds/normalize/type/INVALID"
+        )
+
+        assert response.status_code == 400
+        data = response.json()
+        assert "Invalid sound type" in data["detail"]
+        assert "Must be one of: SDB, TTS, EXT" in data["detail"]
+
+    @pytest.mark.asyncio
+    async def test_normalize_sounds_by_type_with_params(
+        self,
+        authenticated_admin_client: AsyncClient,
+        admin_user: User,
+    ):
+        """Test normalization by type with force and one_pass parameters."""
+        mock_results: NormalizationResults = {
+            "processed": 1,
+            "normalized": 1,
+            "skipped": 0,
+            "errors": 0,
+            "files": [],
+        }
+
+        with patch(
+            "app.services.sound_normalizer.SoundNormalizerService.normalize_sounds_by_type"
+        ) as mock_normalize:
+            mock_normalize.return_value = mock_results
+
+            response = await authenticated_admin_client.post(
+                "/api/v1/sounds/normalize/type/TTS",
+                params={"force": True, "one_pass": False},
+            )
+
+            assert response.status_code == 200
+
+            # Verify parameters were passed correctly
+            mock_normalize.assert_called_once_with(
+                sound_type="TTS", force=True, one_pass=False
+            )
+
+    @pytest.mark.asyncio
+    async def test_normalize_sound_by_id_success(
+        self,
+        authenticated_admin_client: AsyncClient,
+        admin_user: User,
+    ):
+        """Test successful normalization of a specific sound."""
+        # Mock the sound
+        mock_sound = type(
+            "Sound",
+            (),
+            {
+                "id": 42,
+                "filename": "specific_sound.mp3",
+                "type": "SDB",
+                "name": "Specific Sound",
+            },
+        )()
+
+        # Mock normalization result
+        mock_result = {
+            "filename": "specific_sound.mp3",
+            "status": "normalized",
+            "reason": None,
+            "original_path": "/fake/specific_sound.mp3",
+            "normalized_path": "/fake/specific_sound_normalized.mp3",
+            "normalized_filename": "specific_sound_normalized.mp3",
+            "normalized_duration": 8000,
+            "normalized_size": 1600,
+            "normalized_hash": "specific_hash",
+            "id": 42,
+            "error": None,
+        }
+
+        with patch(
+            "app.services.sound_normalizer.SoundNormalizerService.normalize_sound"
+        ) as mock_normalize_sound, patch(
+            "app.repositories.sound.SoundRepository.get_by_id"
+        ) as mock_get_sound:
+
+            mock_get_sound.return_value = mock_sound
+            mock_normalize_sound.return_value = mock_result
+
+            response = await authenticated_admin_client.post(
+                "/api/v1/sounds/normalize/42"
+            )
+
+            assert response.status_code == 200
+            data = response.json()
+
+            assert "Sound normalization normalized" in data["message"]
+            assert "specific_sound.mp3" in data["message"]
+            assert data["status"] == "normalized"
+            assert data["normalized_filename"] == "specific_sound_normalized.mp3"
+
+            # Verify sound was retrieved and normalized
+            mock_get_sound.assert_called_once_with(42)
+            mock_normalize_sound.assert_called_once()
+
+    @pytest.mark.asyncio
+    async def test_normalize_sound_by_id_not_found(
+        self,
+        authenticated_admin_client: AsyncClient,
+        admin_user: User,
+    ):
+        """Test normalization of non-existent sound."""
+        with patch(
+            "app.repositories.sound.SoundRepository.get_by_id"
+        ) as mock_get_sound:
+            mock_get_sound.return_value = None
+
+            response = await authenticated_admin_client.post(
+                "/api/v1/sounds/normalize/999"
+            )
+
+            assert response.status_code == 404
+            data = response.json()
+            assert "Sound with ID 999 not found" in data["detail"]
+
+    @pytest.mark.asyncio
+    async def test_normalize_sound_by_id_normalization_error(
+        self,
+        authenticated_admin_client: AsyncClient,
+        admin_user: User,
+    ):
+        """Test normalization when the sound normalization fails."""
+        # Mock the sound
+        mock_sound = type(
+            "Sound",
+            (),
+            {
+                "id": 42,
+                "filename": "error_sound.mp3",
+                "type": "SDB",
+                "name": "Error Sound",
+            },
+        )()
+
+        # Mock normalization error result
+        mock_result = {
+            "filename": "error_sound.mp3",
+            "status": "error",
+            "reason": None,
+            "original_path": "/fake/error_sound.mp3",
+            "normalized_path": None,
+            "normalized_filename": None,
+            "normalized_duration": None,
+            "normalized_size": None,
+            "normalized_hash": None,
+            "id": 42,
+            "error": "File format not supported",
+        }
+
+        with patch(
+            "app.services.sound_normalizer.SoundNormalizerService.normalize_sound"
+        ) as mock_normalize_sound, patch(
+            "app.repositories.sound.SoundRepository.get_by_id"
+        ) as mock_get_sound:
+
+            mock_get_sound.return_value = mock_sound
+            mock_normalize_sound.return_value = mock_result
+
+            response = await authenticated_admin_client.post(
+                "/api/v1/sounds/normalize/42"
+            )
+
+            assert response.status_code == 500
+            data = response.json()
+            assert "Failed to normalize sound" in data["detail"]
+            assert "File format not supported" in data["detail"]
+
+    @pytest.mark.asyncio
+    async def test_normalize_sound_by_id_with_params(
+        self,
+        authenticated_admin_client: AsyncClient,
+        admin_user: User,
+    ):
+        """Test sound normalization with force and one_pass parameters."""
+        # Mock the sound
+        mock_sound = type(
+            "Sound",
+            (),
+            {
+                "id": 42,
+                "filename": "param_sound.mp3",
+                "type": "SDB",
+                "name": "Param Sound",
+            },
+        )()
+
+        # Mock normalization result
+        mock_result = {
+            "filename": "param_sound.mp3",
+            "status": "normalized",
+            "reason": None,
+            "original_path": "/fake/param_sound.mp3",
+            "normalized_path": "/fake/param_sound_normalized.mp3",
+            "normalized_filename": "param_sound_normalized.mp3",
+            "normalized_duration": 5000,
+            "normalized_size": 1000,
+            "normalized_hash": "param_hash",
+            "id": 42,
+            "error": None,
+        }
+
+        with patch(
+            "app.services.sound_normalizer.SoundNormalizerService.normalize_sound"
+        ) as mock_normalize_sound, patch(
+            "app.repositories.sound.SoundRepository.get_by_id"
+        ) as mock_get_sound:
+
+            mock_get_sound.return_value = mock_sound
+            mock_normalize_sound.return_value = mock_result
+
+            response = await authenticated_admin_client.post(
+                "/api/v1/sounds/normalize/42",
+                params={"force": True, "one_pass": True},
+            )
+
+            assert response.status_code == 200
+
+            # Verify parameters were passed to normalize_sound
+            call_args = mock_normalize_sound.call_args
+            assert call_args[1]["force"] == True
+            assert call_args[1]["one_pass"] == True
+
+    @pytest.mark.asyncio
+    async def test_normalize_sound_by_id_skipped(
+        self,
+        authenticated_admin_client: AsyncClient,
+        admin_user: User,
+    ):
+        """Test normalization when sound is already normalized and not forced."""
+        # Mock the sound
+        mock_sound = type(
+            "Sound",
+            (),
+            {
+                "id": 42,
+                "filename": "already_normalized.mp3",
+                "type": "SDB",
+                "name": "Already Normalized",
+            },
+        )()
+
+        # Mock skipped result
+        mock_result = {
+            "filename": "already_normalized.mp3",
+            "status": "skipped",
+            "reason": "already normalized",
+            "original_path": None,
+            "normalized_path": None,
+            "normalized_filename": None,
+            "normalized_duration": None,
+            "normalized_size": None,
+            "normalized_hash": None,
+            "id": 42,
+            "error": None,
+        }
+
+        with patch(
+            "app.services.sound_normalizer.SoundNormalizerService.normalize_sound"
+        ) as mock_normalize_sound, patch(
+            "app.repositories.sound.SoundRepository.get_by_id"
+        ) as mock_get_sound:
+
+            mock_get_sound.return_value = mock_sound
+            mock_normalize_sound.return_value = mock_result
+
+            response = await authenticated_admin_client.post(
+                "/api/v1/sounds/normalize/42"
+            )
+
+            assert response.status_code == 200
+            data = response.json()
+
+            assert "Sound normalization skipped" in data["message"]
+            assert data["status"] == "skipped"
+            assert data["reason"] == "already normalized"
+
+    @pytest.mark.asyncio
+    async def test_normalize_sound_by_id_unauthenticated(self, client: AsyncClient):
+        """Test normalizing a specific sound without authentication."""
+        response = await client.post("/api/v1/sounds/normalize/42")
+
+        assert response.status_code == 401
+        data = response.json()
+        assert "Could not validate credentials" in data["detail"]
+
+    @pytest.mark.asyncio
+    async def test_normalize_sound_by_id_non_admin(
+        self,
+        test_app,
+        test_user: User,
+    ):
+        """Test normalizing a specific sound with non-admin user."""
+        from app.core.dependencies import get_current_active_user_flexible
+
+        # Override the dependency to return regular user
+        async def override_get_current_user():
+            test_user.role = "user"
+            return test_user
+
+        test_app.dependency_overrides[get_current_active_user_flexible] = (
+            override_get_current_user
+        )
+
+        headers = {"API-TOKEN": "test_api_token"}
+
+        async with AsyncClient(
+            transport=ASGITransport(app=test_app),
+            base_url="http://test",
+        ) as client:
+            response = await client.post(
+                "/api/v1/sounds/normalize/42", headers=headers
+            )
+
+            assert response.status_code == 403
+            data = response.json()
+            assert "Only administrators can normalize sounds" in data["detail"]
+
+        # Clean up override
+        test_app.dependency_overrides.pop(get_current_active_user_flexible, None)

tests/services/test_sound_normalizer.py

@@ -0,0 +1,559 @@
+"""Tests for sound normalizer service."""
+
+import tempfile
+from pathlib import Path
+from unittest.mock import AsyncMock, Mock, patch
+
+import pytest
+from sqlmodel.ext.asyncio.session import AsyncSession
+
+from app.models.sound import Sound
+from app.services.sound_normalizer import SoundNormalizerService
+
+
+class TestSoundNormalizerService:
+    """Test sound normalizer service."""
+
+    @pytest.fixture
+    def mock_session(self):
+        """Create a mock session."""
+        return Mock(spec=AsyncSession)
+
+    @pytest.fixture
+    def normalizer_service(self, mock_session):
+        """Create a normalizer service with mock session."""
+        with patch("app.services.sound_normalizer.settings") as mock_settings:
+            mock_settings.NORMALIZED_AUDIO_FORMAT = "mp3"
+            mock_settings.NORMALIZED_AUDIO_BITRATE = "256k"
+            mock_settings.NORMALIZED_AUDIO_PASSES = 2
+            return SoundNormalizerService(mock_session)
+
+    def test_init(self, normalizer_service):
+        """Test normalizer service initialization."""
+        assert normalizer_service.session is not None
+        assert normalizer_service.sound_repo is not None
+        assert normalizer_service.output_format == "mp3"
+        assert normalizer_service.output_bitrate == "256k"
+        assert normalizer_service.passes == 2
+        assert len(normalizer_service.type_directories) == 3
+        assert "SDB" in normalizer_service.type_directories
+        assert "TTS" in normalizer_service.type_directories
+        assert "EXT" in normalizer_service.type_directories
+
+    def test_get_normalized_path(self, normalizer_service):
+        """Test normalized path generation."""
+        sound = Sound(
+            id=1,
+            type="SDB",
+            name="Test Sound",
+            filename="test_audio.mp3",
+            duration=5000,
+            size=1024,
+            hash="test_hash",
+        )
+
+        normalized_path = normalizer_service._get_normalized_path(sound)
+        
+        assert "sounds/normalized/soundboard" in str(normalized_path)
+        assert "test_audio.mp3" == normalized_path.name
+
+    def test_get_original_path(self, normalizer_service):
+        """Test original path generation."""
+        sound = Sound(
+            id=1,
+            type="SDB",
+            name="Test Sound",
+            filename="test_audio.wav",
+            duration=5000,
+            size=1024,
+            hash="test_hash",
+        )
+
+        original_path = normalizer_service._get_original_path(sound)
+        
+        assert "sounds/originals/soundboard" in str(original_path)
+        assert "test_audio.wav" == original_path.name
+
+    def test_get_file_hash(self, normalizer_service):
+        """Test file hash calculation."""
+        # Create a temporary file
+        with tempfile.NamedTemporaryFile(mode="w", delete=False) as f:
+            f.write("test content for hash")
+            temp_path = Path(f.name)
+
+        try:
+            hash_value = normalizer_service._get_file_hash(temp_path)
+            assert len(hash_value) == 64  # SHA-256 hash length
+            assert isinstance(hash_value, str)
+        finally:
+            temp_path.unlink()
+
+    def test_get_file_size(self, normalizer_service):
+        """Test file size calculation."""
+        # Create a temporary file
+        with tempfile.NamedTemporaryFile(mode="w", delete=False) as f:
+            f.write("test content for size")
+            temp_path = Path(f.name)
+
+        try:
+            size = normalizer_service._get_file_size(temp_path)
+            assert size > 0
+            assert isinstance(size, int)
+        finally:
+            temp_path.unlink()
+
+    @patch("app.services.sound_normalizer.ffmpeg.probe")
+    def test_get_audio_duration_success(self, mock_probe, normalizer_service):
+        """Test successful audio duration extraction."""
+        mock_probe.return_value = {"format": {"duration": "123.456"}}
+
+        temp_path = Path("/fake/path/test.mp3")
+        duration = normalizer_service._get_audio_duration(temp_path)
+
+        assert duration == 123456  # 123.456 seconds * 1000 = 123456 ms
+        mock_probe.assert_called_once_with(str(temp_path))
+
+    @patch("app.services.sound_normalizer.ffmpeg.probe")
+    def test_get_audio_duration_failure(self, mock_probe, normalizer_service):
+        """Test audio duration extraction failure."""
+        mock_probe.side_effect = Exception("FFmpeg error")
+
+        temp_path = Path("/fake/path/test.mp3")
+        duration = normalizer_service._get_audio_duration(temp_path)
+
+        assert duration == 0
+        mock_probe.assert_called_once_with(str(temp_path))
+
+    @pytest.mark.asyncio
+    async def test_normalize_sound_already_normalized(self, normalizer_service):
+        """Test normalizing a sound that's already normalized."""
+        sound = Sound(
+            id=1,
+            type="SDB",
+            name="Test Sound",
+            filename="test.mp3",
+            duration=5000,
+            size=1024,
+            hash="test_hash",
+            is_normalized=True,
+        )
+
+        result = await normalizer_service.normalize_sound(sound)
+
+        assert result["status"] == "skipped"
+        assert result["reason"] == "already normalized"
+        assert result["filename"] == "test.mp3"
+        assert result["id"] == 1
+
+    @pytest.mark.asyncio
+    async def test_normalize_sound_force_already_normalized(self, normalizer_service):
+        """Test force normalizing a sound that's already normalized."""
+        sound = Sound(
+            id=1,
+            type="SDB",
+            name="Test Sound", 
+            filename="test.mp3",
+            duration=5000,
+            size=1024,
+            hash="test_hash",
+            is_normalized=True,
+        )
+
+        # Mock file operations and ffmpeg
+        with patch.object(normalizer_service, "_get_original_path") as mock_orig_path, \
+             patch.object(normalizer_service, "_get_normalized_path") as mock_norm_path, \
+             patch.object(normalizer_service, "_normalize_audio_two_pass") as mock_normalize, \
+             patch.object(normalizer_service, "_get_audio_duration", return_value=6000), \
+             patch.object(normalizer_service, "_get_file_size", return_value=2048), \
+             patch.object(normalizer_service, "_get_file_hash", return_value="new_hash"):
+
+            # Setup path mocks
+            mock_orig_path.return_value = Path("/fake/original.mp3")
+            mock_norm_path.return_value = Path("/fake/normalized.mp3")
+            
+            # Mock file existence
+            with patch("pathlib.Path.exists", return_value=True):
+                # Mock repository update
+                normalizer_service.sound_repo.update = AsyncMock()
+
+                result = await normalizer_service.normalize_sound(sound, force=True)
+
+                assert result["status"] == "normalized"
+                assert result["filename"] == "test.mp3"
+                assert result["normalized_duration"] == 6000
+                assert result["normalized_size"] == 2048
+                assert result["normalized_hash"] == "new_hash"
+
+                # Verify update was called
+                normalizer_service.sound_repo.update.assert_called_once()
+
+    @pytest.mark.asyncio
+    async def test_normalize_sound_file_not_found(self, normalizer_service):
+        """Test normalizing a sound where original file doesn't exist."""
+        sound = Sound(
+            id=1,
+            type="SDB",
+            name="Test Sound",
+            filename="missing.mp3",
+            duration=5000,
+            size=1024,
+            hash="test_hash",
+            is_normalized=False,
+        )
+
+        with patch.object(normalizer_service, "_get_original_path") as mock_path:
+            mock_path.return_value = Path("/fake/missing.mp3")
+            
+            # Mock file doesn't exist
+            with patch("pathlib.Path.exists", return_value=False):
+                result = await normalizer_service.normalize_sound(sound)
+
+                assert result["status"] == "error"
+                assert "Original file not found" in result["error"]
+                assert result["filename"] == "missing.mp3"
+
+    @pytest.mark.asyncio
+    async def test_normalize_sound_one_pass(self, normalizer_service):
+        """Test normalizing a sound using one-pass method."""
+        sound = Sound(
+            id=1,
+            type="SDB",
+            name="Test Sound",
+            filename="test.mp3",
+            duration=5000,
+            size=1024,
+            hash="test_hash",
+            is_normalized=False,
+        )
+
+        with patch.object(normalizer_service, "_get_original_path") as mock_orig_path, \
+             patch.object(normalizer_service, "_get_normalized_path") as mock_norm_path, \
+             patch.object(normalizer_service, "_normalize_audio_one_pass") as mock_normalize, \
+             patch.object(normalizer_service, "_get_audio_duration", return_value=5500), \
+             patch.object(normalizer_service, "_get_file_size", return_value=1500), \
+             patch.object(normalizer_service, "_get_file_hash", return_value="norm_hash"):
+
+            # Setup path mocks
+            mock_orig_path.return_value = Path("/fake/original.mp3")
+            mock_norm_path.return_value = Path("/fake/normalized.mp3")
+            
+            # Mock file existence
+            with patch("pathlib.Path.exists", return_value=True):
+                # Mock repository update
+                normalizer_service.sound_repo.update = AsyncMock()
+
+                result = await normalizer_service.normalize_sound(sound, one_pass=True)
+
+                assert result["status"] == "normalized"
+                assert result["normalized_duration"] == 5500
+                assert result["normalized_size"] == 1500
+                assert result["normalized_hash"] == "norm_hash"
+                
+                # Verify one-pass was used
+                mock_normalize.assert_called_once()
+
+    @pytest.mark.asyncio
+    async def test_normalize_sound_normalization_error(self, normalizer_service):
+        """Test handling normalization errors."""
+        sound = Sound(
+            id=1,
+            type="SDB",
+            name="Test Sound",
+            filename="test.mp3",
+            duration=5000,
+            size=1024,
+            hash="test_hash",
+            is_normalized=False,
+        )
+
+        with patch.object(normalizer_service, "_get_original_path") as mock_orig_path, \
+             patch.object(normalizer_service, "_get_normalized_path") as mock_norm_path:
+
+            # Setup path mocks
+            mock_orig_path.return_value = Path("/fake/original.mp3")
+            mock_norm_path.return_value = Path("/fake/normalized.mp3")
+            
+            # Mock file existence but normalization fails
+            with patch("pathlib.Path.exists", return_value=True), \
+                 patch.object(normalizer_service, "_normalize_audio_two_pass") as mock_normalize:
+                
+                mock_normalize.side_effect = Exception("Normalization failed")
+
+                result = await normalizer_service.normalize_sound(sound)
+
+                assert result["status"] == "error"
+                assert "Normalization failed" in result["error"]
+                assert result["filename"] == "test.mp3"
+
+    @pytest.mark.asyncio
+    async def test_normalize_all_sounds(self, normalizer_service):
+        """Test normalizing all unnormalized sounds."""
+        sounds = [
+            Sound(
+                id=1,
+                type="SDB",
+                name="Sound 1",
+                filename="sound1.mp3",
+                duration=5000,
+                size=1024,
+                hash="hash1",
+                is_normalized=False,
+            ),
+            Sound(
+                id=2,
+                type="TTS",
+                name="Sound 2", 
+                filename="sound2.wav",
+                duration=3000,
+                size=512,
+                hash="hash2",
+                is_normalized=False,
+            ),
+        ]
+
+        # Mock repository calls
+        normalizer_service.sound_repo.get_unnormalized_sounds = AsyncMock(return_value=sounds)
+        
+        # Mock individual normalization
+        with patch.object(normalizer_service, "normalize_sound") as mock_normalize:
+            mock_normalize.side_effect = [
+                {
+                    "filename": "sound1.mp3",
+                    "status": "normalized",
+                    "reason": None,
+                    "original_path": "/fake/sound1.mp3",
+                    "normalized_path": "/fake/sound1_normalized.mp3",
+                    "normalized_filename": "sound1_normalized.mp3",
+                    "normalized_duration": 5000,
+                    "normalized_size": 1024,
+                    "normalized_hash": "norm_hash1",
+                    "id": 1,
+                    "error": None,
+                },
+                {
+                    "filename": "sound2.wav",
+                    "status": "normalized",
+                    "reason": None,
+                    "original_path": "/fake/sound2.wav",
+                    "normalized_path": "/fake/sound2_normalized.mp3",
+                    "normalized_filename": "sound2_normalized.mp3",
+                    "normalized_duration": 3000,
+                    "normalized_size": 512,
+                    "normalized_hash": "norm_hash2",
+                    "id": 2,
+                    "error": None,
+                },
+            ]
+
+            results = await normalizer_service.normalize_all_sounds()
+
+            assert results["processed"] == 2
+            assert results["normalized"] == 2
+            assert results["skipped"] == 0
+            assert results["errors"] == 0
+            assert len(results["files"]) == 2
+
+    @pytest.mark.asyncio
+    async def test_normalize_sounds_by_type(self, normalizer_service):
+        """Test normalizing sounds by type."""
+        sdb_sounds = [
+            Sound(
+                id=1,
+                type="SDB",
+                name="SDB Sound",
+                filename="sdb.mp3",
+                duration=5000,
+                size=1024,
+                hash="sdb_hash",
+                is_normalized=False,
+            ),
+        ]
+
+        # Mock repository calls
+        normalizer_service.sound_repo.get_unnormalized_sounds_by_type = AsyncMock(
+            return_value=sdb_sounds
+        )
+        
+        # Mock individual normalization
+        with patch.object(normalizer_service, "normalize_sound") as mock_normalize:
+            mock_normalize.return_value = {
+                "filename": "sdb.mp3",
+                "status": "normalized",
+                "reason": None,
+                "original_path": "/fake/sdb.mp3",
+                "normalized_path": "/fake/sdb_normalized.mp3",
+                "normalized_filename": "sdb_normalized.mp3",
+                "normalized_duration": 5000,
+                "normalized_size": 1024,
+                "normalized_hash": "sdb_norm_hash",
+                "id": 1,
+                "error": None,
+            }
+
+            results = await normalizer_service.normalize_sounds_by_type("SDB")
+
+            assert results["processed"] == 1
+            assert results["normalized"] == 1
+            assert results["skipped"] == 0
+            assert results["errors"] == 0
+            assert len(results["files"]) == 1
+
+            # Verify correct repository method was called
+            normalizer_service.sound_repo.get_unnormalized_sounds_by_type.assert_called_once_with("SDB")
+
+    @pytest.mark.asyncio
+    async def test_normalize_sounds_with_errors(self, normalizer_service):
+        """Test normalizing sounds with some errors."""
+        sounds = [
+            Sound(
+                id=1,
+                type="SDB",
+                name="Good Sound",
+                filename="good.mp3",
+                duration=5000,
+                size=1024,
+                hash="good_hash",
+                is_normalized=False,
+            ),
+            Sound(
+                id=2,
+                type="SDB",
+                name="Bad Sound",
+                filename="bad.mp3",
+                duration=3000,
+                size=512,
+                hash="bad_hash",
+                is_normalized=False,
+            ),
+        ]
+
+        # Mock repository calls
+        normalizer_service.sound_repo.get_unnormalized_sounds = AsyncMock(return_value=sounds)
+        
+        # Mock individual normalization with one success and one error
+        with patch.object(normalizer_service, "normalize_sound") as mock_normalize:
+            mock_normalize.side_effect = [
+                {
+                    "filename": "good.mp3",
+                    "status": "normalized",
+                    "reason": None,
+                    "original_path": "/fake/good.mp3",
+                    "normalized_path": "/fake/good_normalized.mp3",
+                    "normalized_filename": "good_normalized.mp3",
+                    "normalized_duration": 5000,
+                    "normalized_size": 1024,
+                    "normalized_hash": "good_norm_hash",
+                    "id": 1,
+                    "error": None,
+                },
+                {
+                    "filename": "bad.mp3",
+                    "status": "error",
+                    "reason": None,
+                    "original_path": "/fake/bad.mp3",
+                    "normalized_path": None,
+                    "normalized_filename": None,
+                    "normalized_duration": None,
+                    "normalized_size": None,
+                    "normalized_hash": None,
+                    "id": 2,
+                    "error": "File processing failed",
+                },
+            ]
+
+            results = await normalizer_service.normalize_all_sounds()
+
+            assert results["processed"] == 2
+            assert results["normalized"] == 1
+            assert results["skipped"] == 0
+            assert results["errors"] == 1
+            assert len(results["files"]) == 2
+
+            # Check error file details
+            error_file = next(f for f in results["files"] if f["status"] == "error")
+            assert error_file["filename"] == "bad.mp3"
+            assert error_file["error"] == "File processing failed"
+
+    @pytest.mark.asyncio
+    @patch("app.services.sound_normalizer.ffmpeg")
+    async def test_normalize_audio_one_pass_mp3(
+        self, 
+        mock_ffmpeg,
+        normalizer_service,
+    ):
+        """Test one-pass audio normalization for MP3."""
+        input_path = Path("/fake/input.wav")
+        output_path = Path("/fake/output.mp3")
+
+        # Mock ffmpeg chain
+        mock_stream = Mock()
+        mock_ffmpeg.input.return_value = mock_stream
+        mock_ffmpeg.filter.return_value = mock_stream
+        mock_ffmpeg.output.return_value = mock_stream
+        mock_ffmpeg.overwrite_output.return_value = mock_stream
+
+        await normalizer_service._normalize_audio_one_pass(input_path, output_path)
+
+        # Verify ffmpeg chain was called correctly
+        mock_ffmpeg.input.assert_called_once_with(str(input_path))
+        mock_ffmpeg.filter.assert_called_once_with(mock_stream, "loudnorm", I=-23, TP=-2, LRA=7)
+        mock_ffmpeg.output.assert_called_once()
+        mock_ffmpeg.run.assert_called_once()
+
+        # Check output arguments include MP3 codec and bitrate
+        output_call_args = mock_ffmpeg.output.call_args
+        assert output_call_args[0][1] == str(output_path)  # output path
+        output_kwargs = output_call_args[1]
+        assert output_kwargs["acodec"] == "libmp3lame"
+        assert output_kwargs["audio_bitrate"] == "256k"
+
+    @pytest.mark.asyncio
+    @patch("app.services.sound_normalizer.ffmpeg")
+    async def test_normalize_audio_two_pass_analysis(
+        self,
+        mock_ffmpeg,
+        normalizer_service,
+    ):
+        """Test two-pass audio normalization analysis phase."""
+        input_path = Path("/fake/input.wav")
+        output_path = Path("/fake/output.mp3")
+
+        # Mock ffmpeg chain 
+        mock_stream = Mock()
+        mock_ffmpeg.input.return_value = mock_stream
+        mock_ffmpeg.filter.return_value = mock_stream
+        mock_ffmpeg.output.return_value = mock_stream
+        mock_ffmpeg.overwrite_output.return_value = mock_stream
+
+        # Mock analysis output with valid JSON
+        analysis_json = '''{
+            "input_i": "-23.0",
+            "input_lra": "11.0", 
+            "input_tp": "-2.0",
+            "input_thresh": "-33.0",
+            "target_offset": "0.0"
+        }'''
+        
+        mock_ffmpeg.run.side_effect = [
+            (None, analysis_json.encode("utf-8")),  # First pass analysis
+            None,  # Second pass normalization
+        ]
+
+        await normalizer_service._normalize_audio_two_pass(input_path, output_path)
+
+        # Verify two ffmpeg runs occurred
+        assert mock_ffmpeg.run.call_count == 2
+
+        # Verify analysis pass used print_format=json
+        first_filter_call = mock_ffmpeg.filter.call_args_list[0]
+        assert "print_format" in first_filter_call[1]
+        assert first_filter_call[1]["print_format"] == "json"
+
+        # Verify second pass used measured values
+        second_filter_call = mock_ffmpeg.filter.call_args_list[1] 
+        measured_args = second_filter_call[1]
+        assert "measured_I" in measured_args
+        assert "measured_LRA" in measured_args
+        assert "measured_TP" in measured_args
+        assert "measured_thresh" in measured_args
+        assert "offset" in measured_args