feat: AcoustID audio verification, MusicBrainz enrichment UI, v1.5

Add optional post-download audio fingerprint verification using AcoustID.
  Downloads are verified against expected track/artist using fuzzy string
  matching on AcoustID results. Mismatched files are quarantined and
  automatically added to the wishlist for retry.

  - AcoustID verification with title/artist fuzzy matching (not MBID comparison)
  - Quarantine system with JSON metadata sidecars for failed verifications
  - fpcalc binary auto-download for Windows, macOS (universal), and Linux
  - MusicBrainz enrichment worker with live status UI and track badges
  - Settings page AcoustID section with real-fingerprint connection test
  - Source reuse for album downloads to keep tracks from same Soulseek user
  - Enhanced search queries for better track matching
  - Bug fixes: wishlist tracking, album splitting, regex & handling, log rotation

.gitignore

@@ -6,3 +6,6 @@ __pycache__/
 **/__pycache__/
 *.pyc
 *.pyo
+
+# Auto-downloaded binaries
+bin/

Dockerfile

@@ -15,6 +15,7 @@ RUN apt-get update && apt-get install -y \
     curl \
     gosu \
     ffmpeg \
+    libchromaprint-tools \
     && rm -rf /var/lib/apt/lists/*
 
 # Create non-root user for security

config/settings.py

@@ -195,6 +195,10 @@ class ConfigManager:
             "listenbrainz": {
                 "token": ""
             },
+            "acoustid": {
+                "api_key": "",
+                "enabled": False  # Disabled by default - requires API key and fpcalc
+            },
             "logging": {
                 "path": "logs/app.log",
                 "level": "INFO"

core/acoustid_client.py

@@ -0,0 +1,450 @@
+"""
+AcoustID Client for audio fingerprinting and lookup.
+
+Uses the pyacoustid library which handles:
+- Fingerprint generation via chromaprint library
+- AcoustID API lookups
+- Rate limiting
+
+The fpcalc binary is auto-downloaded if not found (Windows, macOS, Linux x86_64).
+"""
+
+import threading
+import sys
+import platform
+import zipfile
+import tarfile
+import tempfile
+import urllib.request
+from typing import Dict, List, Optional, Any, Tuple
+from pathlib import Path
+import os
+import shutil
+import logging.handlers
+
+from utils.logging_config import get_logger
+from config.settings import config_manager
+
+# fpcalc binary location (downloaded automatically if needed)
+FPCALC_BIN_DIR = Path(__file__).parent.parent / "bin"
+CHROMAPRINT_VERSION = "1.5.1"
+
+# Set up dedicated AcoustID logger with its own file
+logger = get_logger("acoustid_client")
+
+# Add dedicated file handler for AcoustID logs
+_acoustid_log_path = Path(__file__).parent.parent / "logs" / "acoustid.log"
+_acoustid_log_path.parent.mkdir(parents=True, exist_ok=True)
+_acoustid_file_handler = logging.handlers.RotatingFileHandler(
+    _acoustid_log_path, encoding='utf-8', maxBytes=5*1024*1024, backupCount=2
+)
+_acoustid_file_handler.setLevel(logging.DEBUG)
+_acoustid_file_handler.setFormatter(logging.Formatter(
+    fmt='%(asctime)s - %(name)s - %(levelname)s - %(funcName)s:%(lineno)d - %(message)s',
+    datefmt='%Y-%m-%d %H:%M:%S'
+))
+logger.addHandler(_acoustid_file_handler)
+logging.getLogger("newmusic.acoustid_verification").addHandler(_acoustid_file_handler)
+
+# Check if pyacoustid is available
+try:
+    import acoustid
+    ACOUSTID_AVAILABLE = True
+    logger.info("pyacoustid library loaded successfully")
+except ImportError:
+    ACOUSTID_AVAILABLE = False
+    logger.warning("pyacoustid library not installed - run: pip install pyacoustid")
+
+def _get_fpcalc_download_url() -> Optional[str]:
+    """Get the download URL for fpcalc based on current platform."""
+    system = platform.system().lower()
+    machine = platform.machine().lower()
+
+    # Map architecture names
+    if machine in ('x86_64', 'amd64'):
+        arch = 'x86_64'
+    elif machine in ('i386', 'i686', 'x86'):
+        arch = 'i686'
+    elif machine in ('arm64', 'aarch64'):
+        arch = 'aarch64'
+    else:
+        logger.warning(f"Unknown architecture: {machine}")
+        return None
+
+    base_url = f"https://github.com/acoustid/chromaprint/releases/download/v{CHROMAPRINT_VERSION}"
+
+    if system == 'windows':
+        if arch == 'x86_64':
+            return f"{base_url}/chromaprint-fpcalc-{CHROMAPRINT_VERSION}-windows-x86_64.zip"
+    elif system == 'darwin':
+        # Universal build supports both Intel and Apple Silicon natively
+        return f"{base_url}/chromaprint-fpcalc-{CHROMAPRINT_VERSION}-macos-universal.tar.gz"
+    elif system == 'linux':
+        if arch == 'x86_64':
+            return f"{base_url}/chromaprint-fpcalc-{CHROMAPRINT_VERSION}-linux-x86_64.tar.gz"
+
+    logger.warning(f"No fpcalc download available for {system}-{arch}")
+    return None
+
+
+def _download_fpcalc() -> Optional[str]:
+    """
+    Download and extract fpcalc binary for the current platform.
+
+    Returns:
+        Path to fpcalc binary if successful, None otherwise.
+    """
+    url = _get_fpcalc_download_url()
+    if not url:
+        return None
+
+    try:
+        logger.info(f"Downloading fpcalc from: {url}")
+
+        # Create bin directory
+        FPCALC_BIN_DIR.mkdir(parents=True, exist_ok=True)
+
+        # Download to temp file
+        with tempfile.NamedTemporaryFile(delete=False, suffix=Path(url).suffix) as tmp:
+            tmp_path = tmp.name
+            urllib.request.urlretrieve(url, tmp_path)
+
+        # Extract based on file type
+        fpcalc_name = "fpcalc.exe" if platform.system().lower() == 'windows' else "fpcalc"
+        fpcalc_dest = FPCALC_BIN_DIR / fpcalc_name
+
+        if url.endswith('.zip'):
+            with zipfile.ZipFile(tmp_path, 'r') as zf:
+                # Find fpcalc in the archive
+                for name in zf.namelist():
+                    if name.endswith(fpcalc_name):
+                        # Extract to bin directory
+                        with zf.open(name) as src, open(fpcalc_dest, 'wb') as dst:
+                            dst.write(src.read())
+                        break
+        elif url.endswith('.tar.gz'):
+            with tarfile.open(tmp_path, 'r:gz') as tf:
+                for member in tf.getmembers():
+                    if member.name.endswith('fpcalc'):
+                        # Extract to bin directory
+                        member.name = fpcalc_name
+                        tf.extract(member, FPCALC_BIN_DIR)
+                        break
+
+        # Clean up temp file
+        os.unlink(tmp_path)
+
+        # Make executable on Unix
+        if platform.system().lower() != 'windows':
+            os.chmod(fpcalc_dest, 0o755)
+
+        if fpcalc_dest.exists():
+            logger.info(f"fpcalc downloaded successfully: {fpcalc_dest}")
+            return str(fpcalc_dest)
+        else:
+            logger.error("fpcalc not found in downloaded archive")
+            return None
+
+    except Exception as e:
+        logger.error(f"Failed to download fpcalc: {e}")
+        return None
+
+
+def _find_fpcalc() -> Optional[str]:
+    """Find fpcalc binary, downloading if necessary."""
+    # Check PATH first
+    fpcalc = shutil.which("fpcalc") or shutil.which("fpcalc.exe")
+    if fpcalc:
+        return fpcalc
+
+    # Check our bin directory
+    fpcalc_name = "fpcalc.exe" if platform.system().lower() == 'windows' else "fpcalc"
+    local_fpcalc = FPCALC_BIN_DIR / fpcalc_name
+    if local_fpcalc.exists():
+        return str(local_fpcalc)
+
+    # Try to download
+    return _download_fpcalc()
+
+
+# Check if chromaprint/fpcalc is available for fingerprinting
+CHROMAPRINT_AVAILABLE = False
+FPCALC_PATH = None
+
+if ACOUSTID_AVAILABLE:
+    # Try to find or download fpcalc
+    FPCALC_PATH = _find_fpcalc()
+    if FPCALC_PATH:
+        CHROMAPRINT_AVAILABLE = True
+        logger.info(f"fpcalc binary ready: {FPCALC_PATH}")
+        # Set environment variable so pyacoustid can find it
+        os.environ['FPCALC'] = FPCALC_PATH
+    else:
+        logger.warning("fpcalc not available - fingerprinting will not work")
+
+
+class AcoustIDClient:
+    """
+    Client for audio fingerprinting via pyacoustid.
+
+    Usage:
+        client = AcoustIDClient()
+        available, reason = client.is_available()
+        if available:
+            result = client.fingerprint_and_lookup("/path/to/audio.mp3")
+            if result:
+                for mbid in result['recording_mbids']:
+                    print(f"Match: {mbid}")
+    """
+
+    def __init__(self):
+        """Initialize AcoustID client with settings from config."""
+        self._api_key = None
+        self._enabled = None
+
+    @property
+    def api_key(self) -> str:
+        """Get API key from config (cached)."""
+        if self._api_key is None:
+            self._api_key = config_manager.get('acoustid.api_key', '')
+        return self._api_key
+
+    @property
+    def enabled(self) -> bool:
+        """Check if AcoustID verification is enabled in config."""
+        if self._enabled is None:
+            self._enabled = config_manager.get('acoustid.enabled', False)
+        return self._enabled
+
+    def is_available(self) -> Tuple[bool, str]:
+        """
+        Check if AcoustID verification is available and ready.
+
+        Returns:
+            Tuple of (is_available, reason_message)
+        """
+        if not ACOUSTID_AVAILABLE:
+            return False, "pyacoustid library not installed"
+
+        if not self.api_key:
+            return False, "No AcoustID API key configured"
+
+        if not self.enabled:
+            return False, "AcoustID verification is disabled"
+
+        # Check if chromaprint or fpcalc is available
+        if not self._check_fingerprint_available():
+            return False, "Chromaprint library not installed (install libchromaprint1)"
+
+        return True, "AcoustID verification ready"
+
+    def _check_fingerprint_available(self) -> bool:
+        """Check if we can generate fingerprints (chromaprint lib or fpcalc)."""
+        global CHROMAPRINT_AVAILABLE, FPCALC_PATH
+
+        if CHROMAPRINT_AVAILABLE:
+            return True
+
+        # Try to find/download fpcalc if not already available
+        FPCALC_PATH = _find_fpcalc()
+        if FPCALC_PATH:
+            CHROMAPRINT_AVAILABLE = True
+            os.environ['FPCALC'] = FPCALC_PATH
+            logger.info(f"fpcalc now available: {FPCALC_PATH}")
+            return True
+
+        return False
+
+    def _find_test_audio_file(self) -> Optional[str]:
+        """Find an audio file to use for testing the AcoustID API key."""
+        audio_extensions = {'.mp3', '.flac', '.ogg', '.m4a', '.wav', '.wma', '.aac'}
+        search_dirs = []
+
+        # Check transfer and download paths from config
+        transfer_path = config_manager.get('soulseek.transfer_path', '')
+        download_path = config_manager.get('soulseek.download_path', '')
+        if transfer_path:
+            search_dirs.append(Path(transfer_path))
+        if download_path:
+            search_dirs.append(Path(download_path))
+
+        for search_dir in search_dirs:
+            if not search_dir.exists():
+                continue
+            # Walk up to 2 levels deep to find an audio file quickly
+            for depth, pattern in enumerate(['*', '*/*']):
+                for f in search_dir.glob(pattern):
+                    if f.is_file() and f.suffix.lower() in audio_extensions:
+                        return str(f)
+        return None
+
+    def test_api_key(self) -> Tuple[bool, str]:
+        """
+        Validate the API key by fingerprinting a real audio file and looking it up.
+        Falls back to a direct API call if no audio files are available.
+
+        Returns:
+            Tuple of (success, message)
+        """
+        if not self.api_key:
+            return False, "No API key configured"
+
+        import requests
+
+        try:
+            # Try to find a real audio file to fingerprint for an end-to-end test
+            test_file = self._find_test_audio_file()
+
+            if test_file and CHROMAPRINT_AVAILABLE:
+                logger.info(f"Testing API key with real audio file: {test_file}")
+                try:
+                    result = self.fingerprint_and_lookup(test_file)
+                    # If we get here without exception, the API key is valid
+                    # (invalid keys raise or return error before results)
+                    return True, "AcoustID API key is valid"
+                except Exception as e:
+                    error_str = str(e).lower()
+                    if 'invalid' in error_str and 'api' in error_str:
+                        return False, "Invalid AcoustID API key - get one from https://acoustid.org/new-application"
+                    # Fingerprint/lookup failed for non-key reasons, fall through to direct test
+                    logger.warning(f"Real file test failed ({e}), trying direct API call")
+
+            # Fallback: direct API call with minimal fingerprint
+            url = 'https://api.acoustid.org/v2/lookup'
+            params = {
+                'client': self.api_key,
+                'duration': 187,
+                'fingerprint': 'AQADtMkWaYkSZRGO',
+                'meta': 'recordings'
+            }
+
+            response = requests.get(url, params=params, timeout=10)
+            data = response.json()
+
+            if data.get('status') == 'error':
+                error = data.get('error', {})
+                error_code = error.get('code', 0)
+                error_msg = error.get('message', 'Unknown error')
+
+                # Error code 4 is specifically "invalid API key"
+                if error_code == 4:
+                    return False, "Invalid AcoustID API key - get one from https://acoustid.org/new-application"
+                return False, f"AcoustID API error: {error_msg}"
+
+            # Status is 'ok' - key is valid
+            return True, "AcoustID API key is valid"
+
+        except requests.exceptions.Timeout:
+            return False, "AcoustID API timeout - try again later"
+        except requests.exceptions.RequestException as e:
+            return False, f"Network error: {str(e)}"
+        except Exception as e:
+            logger.error(f"Error testing AcoustID API key: {e}")
+            return False, f"Error: {str(e)}"
+
+    def fingerprint_and_lookup(self, audio_file: str) -> Optional[Dict[str, Any]]:
+        """
+        Generate fingerprint and look up recording in AcoustID.
+
+        This is the main method - combines fingerprinting and lookup in one call.
+
+        Args:
+            audio_file: Path to the audio file
+
+        Returns:
+            Dict with:
+                'recordings': list of dicts with 'mbid', 'title', 'artist', 'score'
+                'best_score': float (highest score across all results)
+                'recording_mbids': list of unique MBIDs (for backward compat)
+            Or None on error.
+        """
+        if not ACOUSTID_AVAILABLE:
+            logger.debug("Cannot lookup: pyacoustid not available")
+            return None
+
+        if not self.api_key:
+            logger.debug("Cannot lookup: no API key")
+            return None
+
+        if not os.path.isfile(audio_file):
+            logger.warning(f"Cannot lookup: file not found: {audio_file}")
+            return None
+
+        try:
+            import acoustid
+
+            api_key_preview = f"{self.api_key[:8]}..." if self.api_key and len(self.api_key) > 8 else "NOT SET"
+            logger.info(f"Fingerprinting and looking up: {audio_file} (API key: {api_key_preview})")
+
+            # Use match() which handles fingerprinting + lookup + parsing
+            logger.debug("Running acoustid.match()...")
+            recordings = []
+            seen_mbids = set()
+            best_score = 0.0
+
+            for result in acoustid.match(
+                self.api_key,
+                audio_file,
+                parse=True
+            ):
+                # match() with parse=True returns (score, recording_id, title, artist)
+                if not isinstance(result, tuple) or len(result) < 2:
+                    logger.warning(f"Unexpected result format: {result}")
+                    continue
+
+                score = result[0]
+                recording_id = result[1]
+                title = result[2] if len(result) > 2 else None
+                artist = result[3] if len(result) > 3 else None
+
+                logger.debug(f"Got result: score={score}, id={recording_id}, title={title}, artist={artist}")
+
+                if score > best_score:
+                    best_score = score
+
+                if recording_id and recording_id not in seen_mbids:
+                    seen_mbids.add(recording_id)
+                    recordings.append({
+                        'mbid': recording_id,
+                        'title': title,
+                        'artist': artist,
+                        'score': score,
+                    })
+                    logger.info(f"Found match: {title} by {artist} (MBID: {recording_id}, score: {score})")
+
+            if not recordings:
+                logger.info(f"No AcoustID matches found for: {audio_file}")
+                return None
+
+            logger.info(f"AcoustID found {len(recordings)} recording(s) (best score: {best_score:.2f})")
+            return {
+                'recordings': recordings,
+                'best_score': best_score,
+                'recording_mbids': list(seen_mbids),
+            }
+
+        except acoustid.NoBackendError:
+            logger.error("Chromaprint library not found and fpcalc not available")
+            return None
+        except acoustid.FingerprintGenerationError as e:
+            logger.warning(f"Failed to fingerprint {audio_file}: {e}")
+            return None
+        except acoustid.WebServiceError as e:
+            # Log more details about the API error
+            api_key_preview = f"{self.api_key[:8]}..." if self.api_key and len(self.api_key) > 8 else "???"
+            logger.warning(f"AcoustID API error (key: {api_key_preview}): {e}")
+            # Check for common errors
+            error_str = str(e).lower()
+            if 'invalid' in error_str or 'unknown' in error_str:
+                logger.error("API key appears to be invalid - check your AcoustID settings")
+            elif 'rate' in error_str or 'limit' in error_str:
+                logger.warning("Rate limited by AcoustID - will retry later")
+            return None
+        except Exception as e:
+            logger.error(f"Unexpected error in AcoustID lookup: {e}", exc_info=True)
+            return None
+
+    def refresh_config(self):
+        """Refresh cached config values (call after settings change)."""
+        self._api_key = None
+        self._enabled = None

core/acoustid_verification.py

@@ -0,0 +1,260 @@
+"""
+AcoustID Verification Service
+
+Verifies downloaded audio files match expected track metadata by comparing
+title/artist from AcoustID fingerprint results against the expected track info.
+
+If the audio fingerprint confidently identifies a DIFFERENT song than expected,
+the file is flagged as incorrect.
+"""
+
+import re
+from difflib import SequenceMatcher
+from typing import Optional, Dict, Any, Tuple, List
+from enum import Enum
+from utils.logging_config import get_logger
+from core.acoustid_client import AcoustIDClient
+
+logger = get_logger("acoustid_verification")
+
+# Thresholds
+MIN_ACOUSTID_SCORE = 0.80       # Minimum AcoustID fingerprint score to trust
+TITLE_MATCH_THRESHOLD = 0.70    # Title similarity needed to consider a match
+ARTIST_MATCH_THRESHOLD = 0.60   # Artist similarity needed to consider a match
+
+
+class VerificationResult(Enum):
+    """Possible outcomes of audio verification."""
+    PASS = "pass"       # Title/artist match - file is correct
+    FAIL = "fail"       # Title/artist mismatch - wrong file downloaded
+    SKIP = "skip"       # Could not verify (error or unavailable) - continue normally
+    DISABLED = "disabled"  # Verification not enabled
+
+
+def _normalize(text: str) -> str:
+    """Normalize a string for comparison: lowercase, strip parentheticals, punctuation."""
+    if not text:
+        return ""
+    s = text.lower().strip()
+    # Remove common parenthetical suffixes like (Live), (Remastered), (Radio Edit)
+    s = re.sub(r'\s*\((?:live|remaster(?:ed)?|deluxe|bonus|radio\s*edit|single\s*version|visualize.*?)\)', '', s, flags=re.IGNORECASE)
+    # Remove non-alphanumeric except spaces
+    s = re.sub(r'[^\w\s]', '', s)
+    # Collapse whitespace
+    s = re.sub(r'\s+', ' ', s).strip()
+    return s
+
+
+def _similarity(a: str, b: str) -> float:
+    """Calculate similarity between two strings (0.0-1.0) after normalization."""
+    na = _normalize(a)
+    nb = _normalize(b)
+    if not na or not nb:
+        return 0.0
+    if na == nb:
+        return 1.0
+    return SequenceMatcher(None, na, nb).ratio()
+
+
+def _find_best_title_artist_match(
+    recordings: List[Dict[str, Any]],
+    expected_title: str,
+    expected_artist: str,
+) -> Tuple[Optional[Dict], float, float]:
+    """
+    Find the AcoustID recording that best matches expected title/artist.
+
+    Returns:
+        (best_recording, title_similarity, artist_similarity)
+    """
+    best_rec = None
+    best_title_sim = 0.0
+    best_artist_sim = 0.0
+    best_combined = 0.0
+
+    for rec in recordings:
+        title = rec.get('title') or ''
+        artist = rec.get('artist') or ''
+
+        title_sim = _similarity(expected_title, title)
+        artist_sim = _similarity(expected_artist, artist)
+        # Weight title higher since that's the primary identifier
+        combined = (title_sim * 0.6) + (artist_sim * 0.4)
+
+        if combined > best_combined:
+            best_combined = combined
+            best_rec = rec
+            best_title_sim = title_sim
+            best_artist_sim = artist_sim
+
+    return best_rec, best_title_sim, best_artist_sim
+
+
+class AcoustIDVerification:
+    """
+    Verification service that compares audio fingerprint identity
+    against expected track metadata using title/artist matching.
+
+    Design Principle: FAIL OPEN
+    - Only returns FAIL when we are CONFIDENT the file is wrong
+    - Any error or uncertainty results in SKIP (continue normally)
+    - Never blocks downloads due to verification infrastructure issues
+
+    Usage:
+        verifier = AcoustIDVerification()
+        result, message = verifier.verify_audio_file(
+            "/path/to/downloaded.mp3",
+            "Expected Song Title",
+            "Expected Artist"
+        )
+
+        if result == VerificationResult.FAIL:
+            # Move to quarantine
+        else:
+            # Continue with normal processing (PASS, SKIP, or DISABLED)
+    """
+
+    def __init__(self):
+        """Initialize verification service."""
+        self.acoustid_client = AcoustIDClient()
+
+    def verify_audio_file(
+        self,
+        audio_file_path: str,
+        expected_track_name: str,
+        expected_artist_name: str,
+        context: Optional[Dict[str, Any]] = None
+    ) -> Tuple[VerificationResult, str]:
+        """
+        Verify that an audio file matches expected track metadata.
+
+        Compares title/artist from AcoustID fingerprint results against
+        the expected track info. No MusicBrainz lookup needed.
+
+        Args:
+            audio_file_path: Path to the downloaded audio file
+            expected_track_name: Track name we expected to download
+            expected_artist_name: Artist name we expected
+            context: Optional download context for logging/debugging
+
+        Returns:
+            Tuple of (VerificationResult, reason_message)
+        """
+        try:
+            # Step 1: Check availability
+            available, reason = self.acoustid_client.is_available()
+            if not available:
+                logger.debug(f"AcoustID verification skipped: {reason}")
+                return VerificationResult.SKIP, reason
+
+            # Step 2: Fingerprint and lookup in AcoustID
+            logger.info(f"Fingerprinting and looking up: {audio_file_path}")
+            acoustid_result = self.acoustid_client.fingerprint_and_lookup(audio_file_path)
+
+            if not acoustid_result:
+                return VerificationResult.SKIP, "Track not found in AcoustID database"
+
+            recordings = acoustid_result.get('recordings', [])
+            best_score = acoustid_result.get('best_score', 0)
+
+            if not recordings:
+                return VerificationResult.SKIP, "AcoustID returned no recordings"
+
+            logger.debug(
+                f"AcoustID returned {len(recordings)} recording(s) "
+                f"(best fingerprint score: {best_score:.2f})"
+            )
+
+            # Step 3: Check fingerprint confidence
+            if best_score < MIN_ACOUSTID_SCORE:
+                msg = f"AcoustID fingerprint score too low ({best_score:.2f}) to verify"
+                logger.info(msg)
+                return VerificationResult.SKIP, msg
+
+            # Step 4: Find best title/artist match among AcoustID results
+            best_rec, title_sim, artist_sim = _find_best_title_artist_match(
+                recordings, expected_track_name, expected_artist_name
+            )
+
+            if not best_rec:
+                return VerificationResult.SKIP, "No recordings with title/artist info"
+
+            matched_title = best_rec.get('title', '?')
+            matched_artist = best_rec.get('artist', '?')
+
+            logger.info(
+                f"Best match: '{matched_title}' by '{matched_artist}' "
+                f"(title_sim={title_sim:.2f}, artist_sim={artist_sim:.2f})"
+            )
+
+            # Step 5: Decide pass/fail based on similarity
+            if title_sim >= TITLE_MATCH_THRESHOLD and artist_sim >= ARTIST_MATCH_THRESHOLD:
+                msg = (
+                    f"Audio verified: '{matched_title}' by '{matched_artist}' "
+                    f"matches expected '{expected_track_name}' by '{expected_artist_name}' "
+                    f"(title={title_sim:.0%}, artist={artist_sim:.0%})"
+                )
+                logger.info(f"AcoustID verification PASSED - {msg}")
+                return VerificationResult.PASS, msg
+
+            # Title matches but artist doesn't — could be a cover or collab, skip
+            if title_sim >= TITLE_MATCH_THRESHOLD and artist_sim < ARTIST_MATCH_THRESHOLD:
+                # Check if the expected artist appears anywhere in the AcoustID results
+                for rec in recordings:
+                    if _similarity(expected_artist_name, rec.get('artist', '')) >= ARTIST_MATCH_THRESHOLD:
+                        msg = (
+                            f"Audio verified: found '{expected_track_name}' by '{expected_artist_name}' "
+                            f"in AcoustID results"
+                        )
+                        logger.info(f"AcoustID verification PASSED (secondary match) - {msg}")
+                        return VerificationResult.PASS, msg
+
+                msg = (
+                    f"Title matches but artist unclear: "
+                    f"AcoustID='{matched_title}' by '{matched_artist}', "
+                    f"expected '{expected_track_name}' by '{expected_artist_name}'"
+                )
+                logger.info(f"AcoustID verification SKIPPED - {msg}")
+                return VerificationResult.SKIP, msg
+
+            # Title doesn't match — check ALL recordings for any title/artist match
+            # (the best combined match might not be the right one if there are many results)
+            for rec in recordings:
+                t = rec.get('title') or ''
+                a = rec.get('artist') or ''
+                if (_similarity(expected_track_name, t) >= TITLE_MATCH_THRESHOLD and
+                        _similarity(expected_artist_name, a) >= ARTIST_MATCH_THRESHOLD):
+                    msg = (
+                        f"Audio verified: found '{t}' by '{a}' in AcoustID results "
+                        f"matching expected '{expected_track_name}' by '{expected_artist_name}'"
+                    )
+                    logger.info(f"AcoustID verification PASSED (scan match) - {msg}")
+                    return VerificationResult.PASS, msg
+
+            # No match found — this file is likely wrong
+            # Report what AcoustID thinks the file actually is (top result by score)
+            top = recordings[0]
+            top_title = top.get('title', '?')
+            top_artist = top.get('artist', '?')
+
+            msg = (
+                f"Audio mismatch: file identified as '{top_title}' by '{top_artist}', "
+                f"expected '{expected_track_name}' by '{expected_artist_name}' "
+                f"(title={title_sim:.0%}, artist={artist_sim:.0%})"
+            )
+            logger.warning(f"AcoustID verification FAILED - {msg}")
+            return VerificationResult.FAIL, msg
+
+        except Exception as e:
+            # Any unexpected error -> SKIP (fail open)
+            logger.error(f"Unexpected error during AcoustID verification: {e}")
+            return VerificationResult.SKIP, f"Verification error: {str(e)}"
+
+    def quick_check_available(self) -> Tuple[bool, str]:
+        """
+        Quick check if verification is available without doing a full verification.
+
+        Returns:
+            Tuple of (is_available, reason)
+        """
+        return self.acoustid_client.is_available()

requirements-webui.txt

@@ -36,4 +36,7 @@ yt-dlp>=2024.12.13
 lrclibapi>=0.3.1
 
 # Optional: MQTT support (for future features)
-asyncio-mqtt>=0.16.0
+asyncio-mqtt>=0.16.0
+
+# Audio fingerprinting for download verification
+pyacoustid>=1.3.0

requirements.txt

@@ -11,4 +11,5 @@ aiohttp>=3.9.0
 unidecode>=1.3.8
 yt-dlp>=2024.12.13
 Flask>=3.0.0
-lrclibapi>=0.3.1
+lrclibapi>=0.3.1
+pyacoustid>=1.3.0

test_acoustid.py

@@ -0,0 +1,295 @@
+#!/usr/bin/env python3
+"""
+AcoustID Integration Test Script
+
+Run this script to test the AcoustID verification system before using it in production.
+It will check:
+1. fpcalc binary availability
+2. API key validation
+3. Fingerprint generation (if audio file provided)
+4. Full verification flow (if audio file and expected track info provided)
+
+Usage:
+    python test_acoustid.py                          # Basic tests
+    python test_acoustid.py path/to/audio.mp3        # Test with audio file
+    python test_acoustid.py path/to/audio.mp3 "Song Title" "Artist Name"  # Full test
+"""
+
+import sys
+import os
+import io
+
+# Fix Windows encoding issues
+if sys.platform == 'win32':
+    sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8', errors='replace')
+    sys.stderr = io.TextIOWrapper(sys.stderr.buffer, encoding='utf-8', errors='replace')
+
+# Add project root to path
+sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
+
+from pathlib import Path
+
+
+def print_header(text):
+    print("\n" + "=" * 60)
+    print(f"  {text}")
+    print("=" * 60)
+
+
+def print_result(success, message):
+    icon = "[PASS]" if success else "[FAIL]"
+    print(f"  {icon} {message}")
+
+
+def test_chromaprint():
+    """Test if chromaprint/fpcalc is available for fingerprinting."""
+    print_header("Testing fingerprint backend availability")
+
+    from core.acoustid_client import CHROMAPRINT_AVAILABLE, ACOUSTID_AVAILABLE, FPCALC_PATH
+
+    if not ACOUSTID_AVAILABLE:
+        print_result(False, "pyacoustid library not installed!")
+        print("\n  To install:")
+        print("    pip install pyacoustid")
+        return False
+
+    if CHROMAPRINT_AVAILABLE and FPCALC_PATH:
+        print_result(True, f"fpcalc ready: {FPCALC_PATH}")
+        return True
+
+    if CHROMAPRINT_AVAILABLE:
+        print_result(True, "Fingerprint backend available")
+        return True
+
+    print_result(False, "No fingerprint backend available!")
+    print("\n  fpcalc will be auto-downloaded on first use.")
+    print("  Or manually install:")
+    print("    - Windows: Auto-download supported")
+    print("    - macOS: brew install chromaprint")
+    print("    - Linux: apt install libchromaprint-tools")
+    return False
+
+
+def test_api_key():
+    """Test if AcoustID API key is configured and valid."""
+    print_header("Testing AcoustID API key")
+
+    from core.acoustid_client import AcoustIDClient
+    from config.settings import config_manager
+
+    api_key = config_manager.get('acoustid.api_key', '')
+
+    if not api_key:
+        print_result(False, "No API key configured in settings")
+        print("\n  To configure:")
+        print("    1. Get a free API key from https://acoustid.org/new-application")
+        print("    2. Add it in Settings > AcoustID section")
+        return False
+
+    print(f"  API key found: {api_key[:8]}...{api_key[-4:]}")
+
+    client = AcoustIDClient()
+    success, message = client.test_api_key()
+
+    print_result(success, message)
+    return success
+
+
+def test_enabled():
+    """Test if AcoustID verification is enabled."""
+    print_header("Testing AcoustID enabled status")
+
+    from config.settings import config_manager
+
+    enabled = config_manager.get('acoustid.enabled', False)
+
+    if enabled:
+        print_result(True, "AcoustID verification is ENABLED")
+    else:
+        print_result(False, "AcoustID verification is DISABLED")
+        print("\n  To enable:")
+        print("    1. Go to Settings > AcoustID section")
+        print("    2. Check 'Enable Download Verification'")
+
+    return enabled
+
+
+def test_availability():
+    """Test overall availability."""
+    print_header("Testing overall availability")
+
+    from core.acoustid_client import AcoustIDClient
+
+    client = AcoustIDClient()
+    available, reason = client.is_available()
+
+    print_result(available, reason)
+    return available
+
+
+def test_fingerprint_and_lookup(audio_file):
+    """Test fingerprint generation and AcoustID lookup for an audio file."""
+    print_header(f"Testing fingerprint and AcoustID lookup")
+    print(f"  File: {audio_file}")
+
+    if not os.path.isfile(audio_file):
+        print_result(False, f"File not found: {audio_file}")
+        return None
+
+    from core.acoustid_client import AcoustIDClient
+
+    client = AcoustIDClient()
+
+    available, reason = client.is_available()
+    if not available:
+        print_result(False, f"AcoustID not available: {reason}")
+        return None
+
+    print("  Fingerprinting and looking up (this may take a moment)...")
+    result = client.fingerprint_and_lookup(audio_file)
+
+    if result:
+        recordings = result.get('recordings', [])
+        score = result.get('best_score', 0)
+        print_result(True, f"Found {len(recordings)} recording(s) (score: {score:.2f})")
+
+        for i, rec in enumerate(recordings[:5]):  # Show first 5
+            title = rec.get('title', '?')
+            artist = rec.get('artist', '?')
+            mbid = rec.get('mbid', '?')
+            rec_score = rec.get('score', 0)
+            print(f"    {i+1}. \"{title}\" by {artist} (score: {rec_score:.2f})")
+            print(f"       https://musicbrainz.org/recording/{mbid}")
+
+        if len(recordings) > 5:
+            print(f"    ... and {len(recordings) - 5} more")
+
+        return result
+    else:
+        print_result(False, "Track not found in AcoustID database")
+        print("  This may be a rare/new track not yet fingerprinted.")
+        return None
+
+
+def test_musicbrainz_lookup(track_name, artist_name):
+    """Test MusicBrainz lookup for expected track."""
+    print_header("Testing MusicBrainz lookup")
+    print(f"  Track: '{track_name}'")
+    print(f"  Artist: '{artist_name}'")
+
+    try:
+        from database.music_database import MusicDatabase
+        from core.musicbrainz_service import MusicBrainzService
+
+        db = MusicDatabase()
+        mb_service = MusicBrainzService(db)
+
+        print("  Searching MusicBrainz...")
+        result = mb_service.match_recording(track_name, artist_name)
+
+        if result:
+            mbid = result.get('mbid')
+            confidence = result.get('confidence', 0)
+            cached = result.get('cached', False)
+
+            print_result(True, f"Found match (confidence: {confidence}%)")
+            print(f"    MBID: {mbid}")
+            print(f"    https://musicbrainz.org/recording/{mbid}")
+            print(f"    Cached: {cached}")
+            return result
+        else:
+            print_result(False, "No match found in MusicBrainz")
+            return None
+
+    except Exception as e:
+        print_result(False, f"Error: {e}")
+        return None
+
+
+def test_full_verification(audio_file, track_name, artist_name):
+    """Test the full verification flow."""
+    print_header("Testing full verification flow")
+    print(f"  File: {audio_file}")
+    print(f"  Expected: '{track_name}' by '{artist_name}'")
+
+    from core.acoustid_verification import AcoustIDVerification, VerificationResult
+
+    verifier = AcoustIDVerification()
+
+    # Check availability first
+    available, reason = verifier.quick_check_available()
+    if not available:
+        print_result(False, f"Verification not available: {reason}")
+        return
+
+    print("  Running verification (this may take a moment)...")
+    result, message = verifier.verify_audio_file(
+        audio_file,
+        track_name,
+        artist_name
+    )
+
+    if result == VerificationResult.PASS:
+        print_result(True, f"VERIFICATION PASSED: {message}")
+    elif result == VerificationResult.FAIL:
+        print_result(False, f"VERIFICATION FAILED: {message}")
+    elif result == VerificationResult.SKIP:
+        print(f"  [SKIP] Verification skipped: {message}")
+    else:
+        print(f"  [????] Unknown result: {result.value} - {message}")
+
+
+def main():
+    print("\n" + "=" * 60)
+    print("  ACOUSTID VERIFICATION SYSTEM TEST")
+    print("=" * 60)
+
+    # Parse arguments
+    audio_file = sys.argv[1] if len(sys.argv) > 1 else None
+    track_name = sys.argv[2] if len(sys.argv) > 2 else None
+    artist_name = sys.argv[3] if len(sys.argv) > 3 else None
+
+    # Run basic tests
+    chromaprint_ok = test_chromaprint()
+    api_key_ok = test_api_key()
+    enabled_ok = test_enabled()
+    available_ok = test_availability()
+
+    # Summary of basic tests
+    print_header("Basic Tests Summary")
+    print(f"  Chromaprint: {'OK' if chromaprint_ok else 'MISSING'}")
+    print(f"  API key:     {'OK' if api_key_ok else 'MISSING/INVALID'}")
+    print(f"  Enabled:     {'YES' if enabled_ok else 'NO'}")
+    print(f"  Available:   {'YES' if available_ok else 'NO'}")
+
+    if not audio_file:
+        print("\n" + "-" * 60)
+        print("  To test fingerprinting, provide an audio file:")
+        print("    python test_acoustid.py path/to/audio.mp3")
+        print("\n  To test full verification flow:")
+        print("    python test_acoustid.py path/to/audio.mp3 \"Song Title\" \"Artist\"")
+        print("-" * 60)
+        return
+
+    # Test with audio file (combined fingerprint + lookup)
+    lookup_result = test_fingerprint_and_lookup(audio_file)
+
+    if track_name and artist_name:
+        # Test MusicBrainz lookup
+        mb_result = test_musicbrainz_lookup(track_name, artist_name)
+
+        # Test full verification
+        if available_ok:
+            test_full_verification(audio_file, track_name, artist_name)
+        else:
+            print("\n  Skipping full verification test (not available)")
+
+    # Point to log file
+    print("\n" + "-" * 60)
+    log_path = Path(__file__).parent / "logs" / "acoustid.log"
+    print(f"  Detailed logs: {log_path}")
+    print("-" * 60 + "\n")
+
+
+if __name__ == "__main__":
+    main()

web_server.py

@@ -1701,6 +1701,39 @@ def run_service_test(service, test_config):
 
             except Exception as e:
                 return False, f"ListenBrainz connection error: {str(e)}"
+        elif service == "acoustid":
+            api_key = test_config.get('api_key', '')
+
+            if not api_key:
+                return False, "Missing AcoustID API key."
+
+            try:
+                from core.acoustid_client import AcoustIDClient, CHROMAPRINT_AVAILABLE, ACOUSTID_AVAILABLE, FPCALC_PATH
+
+                if not ACOUSTID_AVAILABLE:
+                    return False, "pyacoustid library not installed. Run: pip install pyacoustid"
+
+                client = AcoustIDClient()
+
+                # Override the cached API key with the test config key
+                client._api_key = api_key
+
+                # Check chromaprint/fpcalc availability
+                if CHROMAPRINT_AVAILABLE and FPCALC_PATH:
+                    fingerprint_status = f"fpcalc ready: {FPCALC_PATH}"
+                elif CHROMAPRINT_AVAILABLE:
+                    fingerprint_status = "Fingerprint backend available"
+                else:
+                    fingerprint_status = "fpcalc not found (will auto-download on first use)"
+
+                # Validate API key with test request
+                success, message = client.test_api_key()
+                if success:
+                    return True, f"AcoustID API key is valid! {fingerprint_status}"
+                else:
+                    return False, f"{message}. {fingerprint_status}"
+            except Exception as e:
+                return False, f"AcoustID test error: {str(e)}"
         return False, "Unknown service."
     except AttributeError as e:
         # This specifically catches the error you reported for Jellyfin
@@ -8141,6 +8174,20 @@ def _post_process_matched_download_with_verification(context_key, context, file_
         if original_batch_id:
             context['batch_id'] = original_batch_id
 
+        # Check if AcoustID quarantined the file — no further processing needed
+        if context.get('_acoustid_quarantined'):
+            failure_msg = context.get('_acoustid_failure_msg', 'AcoustID verification failed')
+            _pp.info(f"File was quarantined by AcoustID verification (task={task_id}): {failure_msg}")
+            with tasks_lock:
+                if task_id in download_tasks:
+                    download_tasks[task_id]['status'] = 'failed'
+                    download_tasks[task_id]['error_message'] = f"AcoustID verification failed: {failure_msg}"
+            with matched_context_lock:
+                if context_key in matched_downloads_context:
+                    del matched_downloads_context[context_key]
+            _on_download_completed(batch_id, task_id, success=False)
+            return
+
         # Check if simple download handler already completed everything
         if context.get('_simple_download_completed'):
             expected_final_path = context.get('_final_path')
@@ -8280,6 +8327,71 @@ def _post_process_matched_download_with_verification(context_key, context, file_
         _on_download_completed(batch_id, task_id, success=False)
 
 
+def _move_to_quarantine(file_path: str, context: dict, reason: str) -> str:
+    """
+    Move a file to quarantine folder when AcoustID verification fails.
+    Creates a JSON sidecar file with metadata about why the file was quarantined.
+
+    Args:
+        file_path: Original file path
+        context: Download context with track info
+        reason: Reason for quarantine
+
+    Returns:
+        Path to quarantined file
+    """
+    import json
+    from pathlib import Path
+    from datetime import datetime
+
+    # Get quarantine directory (parallel to Transfer folder)
+    transfer_dir = docker_resolve_path(config_manager.get('soulseek.transfer_path', './Transfer'))
+    quarantine_dir = Path(transfer_dir).parent / "Quarantine"
+    quarantine_dir.mkdir(parents=True, exist_ok=True)
+
+    # Create quarantine entry with timestamp
+    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
+    original_name = Path(file_path).stem
+    file_ext = Path(file_path).suffix
+
+    # Build quarantine filename: TIMESTAMP_originalname.ext
+    quarantine_filename = f"{timestamp}_{original_name}{file_ext}"
+    quarantine_path = quarantine_dir / quarantine_filename
+
+    # Move file to quarantine
+    _safe_move_file(file_path, str(quarantine_path))
+
+    # Write metadata sidecar file
+    metadata_path = quarantine_dir / f"{timestamp}_{original_name}.json"
+
+    # Extract track info from context
+    track_info = context.get('track_info', {})
+    original_search = context.get('original_search_result', {})
+    spotify_artist = context.get('spotify_artist', {})
+
+    metadata = {
+        'original_filename': Path(file_path).name,
+        'quarantine_reason': reason,
+        'timestamp': datetime.now().isoformat(),
+        'expected_track': (
+            original_search.get('spotify_clean_title') or
+            track_info.get('name') or
+            original_search.get('title', 'Unknown')
+        ),
+        'expected_artist': spotify_artist.get('name', 'Unknown'),
+        'context_key': context.get('context_key', 'unknown')
+    }
+
+    try:
+        with open(metadata_path, 'w', encoding='utf-8') as f:
+            json.dump(metadata, f, indent=2, ensure_ascii=False)
+    except Exception as e:
+        logger.warning(f"Failed to write quarantine metadata: {e}")
+
+    logger.warning(f"🚫 File quarantined: {quarantine_path} - Reason: {reason}")
+    return str(quarantine_path)
+
+
 def _safe_move_file(src, dst):
     """
     Safely move a file across different filesystems/volumes.
@@ -8389,6 +8501,75 @@ def _post_process_matched_download(context_key, context, file_path):
         time.sleep(1)
         # --- END OF FIX ---
 
+        # --- ACOUSTID VERIFICATION ---
+        # Optional verification that downloaded audio matches expected track.
+        # Only runs if enabled and configured. Fails gracefully (skips on any error).
+        try:
+            from core.acoustid_verification import AcoustIDVerification, VerificationResult
+
+            verifier = AcoustIDVerification()
+            available, available_reason = verifier.quick_check_available()
+
+            if available:
+                # Extract expected track info from context
+                track_info = context.get('track_info', {})
+                original_search = context.get('original_search_result', {})
+                spotify_artist = context.get('spotify_artist', {})
+
+                expected_track = (
+                    original_search.get('spotify_clean_title') or
+                    track_info.get('name') or
+                    original_search.get('title', '')
+                )
+                expected_artist = spotify_artist.get('name', '')
+
+                if expected_track and expected_artist:
+                    print(f"🔍 Running AcoustID verification for: '{expected_track}' by '{expected_artist}'")
+                    verification_result, verification_msg = verifier.verify_audio_file(
+                        file_path,
+                        expected_track,
+                        expected_artist,
+                        context
+                    )
+                    print(f"🔍 AcoustID verification result: {verification_result.value} - {verification_msg}")
+
+                    if verification_result == VerificationResult.FAIL:
+                        # Move to quarantine instead of Transfer
+                        quarantine_path = _move_to_quarantine(file_path, context, verification_msg)
+                        print(f"🚫 File quarantined due to verification failure: {quarantine_path}")
+
+                        # Set flag so the _with_verification wrapper knows we quarantined
+                        context['_acoustid_quarantined'] = True
+                        context['_acoustid_failure_msg'] = verification_msg
+
+                        # Clean up context
+                        with matched_context_lock:
+                            if context_key in matched_downloads_context:
+                                del matched_downloads_context[context_key]
+
+                        # Mark as failed in download tasks if we have task info
+                        task_id = context.get('task_id')
+                        batch_id = context.get('batch_id')
+                        if task_id:
+                            with tasks_lock:
+                                if task_id in download_tasks:
+                                    download_tasks[task_id]['status'] = 'failed'
+                                    download_tasks[task_id]['error_message'] = f"AcoustID verification failed: {verification_msg}"
+
+                        # Call completion callback with failure
+                        if task_id and batch_id:
+                            _on_download_completed(batch_id, task_id, success=False)
+
+                        return  # Don't continue with normal processing
+                else:
+                    print(f"⚠️ AcoustID verification skipped: missing track/artist info")
+            else:
+                print(f"ℹ️ AcoustID verification not available: {available_reason}")
+        except Exception as verify_error:
+            # Any verification error should NOT block the download - fail open
+            print(f"⚠️ AcoustID verification error (continuing normally): {verify_error}")
+        # --- END ACOUSTID VERIFICATION ---
+
         # --- SIMPLE DOWNLOAD HANDLING ---
         # Check if this is a simple download (search page "Download ⬇" button only)
         search_result = context.get('search_result', {})
@@ -9043,40 +9224,50 @@ def get_version_info():
     This provides the same data that the GUI version modal displays.
     """
     version_data = {
-        "version": "1.4",
+        "version": "1.5",
         "title": "What's New in SoulSync",
-        "subtitle": "Version 1.4 - Full iTunes Metadata Support & More",
+        "subtitle": "Version 1.5 - AcoustID Verification & MusicBrainz Integration",
         "sections": [
             {
-                "title": "🍎 Full iTunes Metadata Support",
-                "description": "Complete iTunes integration as a powerful alternative to Spotify",
+                "title": "🔊 AcoustID Download Verification",
+                "description": "Optional audio fingerprint verification to ensure downloaded files match the expected track",
                 "features": [
-                    "• Full Independence - Use SoulSync without a Spotify account! iTunes metadata is now fully capable of replacing Spotify",
-                    "• Automatic Fallback - Seamlessly switches to iTunes metadata if Spotify is unavailable or unauthenticated",
-                    "• Watchlist Support - Add artists, configure downloads, and fetch cover art using iTunes IDs",
-                    "• Smart Matching - Automatically links artists between platforms for maximum compatibility",
-                    "• High-Res Artwork - Fetches high-quality album art directly from Apple's servers"
+                    "• Audio Fingerprinting - Uses AcoustID to verify downloaded files are the correct track before transferring",
+                    "• Smart Matching - Compares title and artist using fuzzy string matching with configurable thresholds",
+                    "• Fail-Safe Design - Only rejects files when confident they are wrong; skips verification on any uncertainty",
+                    "• Quarantine System - Mismatched files are moved to a quarantine folder with metadata for review",
+                    "• Failed tracks are automatically added to the wishlist for retry"
                 ],
-                "usage_note": "No configuration needed! SoulSync automatically uses the best available metadata source."
+                "usage_note": "Enable in Settings > AcoustID. Requires a free API key from acoustid.org."
             },
             {
-                "title": "📺 YouTube Download Engine",
-                "description": "Major overhaul of the YouTube download engine (v1.3 feature)",
+                "title": "🎵 MusicBrainz Enrichment",
+                "description": "Automatic metadata enrichment using MusicBrainz with real-time status tracking",
                 "features": [
-                    "• First-Class Support - YouTube is now a primary download source, fully integrated into the app's core",
-                    "• Hybrid Mode - Automatically fallback to YouTube if Soulseek downloads fail (or vice-versa)",
-                    "• Reliable Downloads - Completely rewritten post-processing engine to eliminate 'file not found' errors",
-                    "• Batch Processing - YouTube downloads now support batch operations and queue management"
+                    "• Background Worker - Continuously enriches your library with MusicBrainz metadata",
+                    "• Live Status UI - Real-time progress indicator shows enrichment status per track",
+                    "• MusicBrainz Badge - Visual indicator on tracks that have been matched and enriched"
                 ]
             },
             {
-                "title": "🐳 Docker & System Reliability",
-                "description": "Critical fixes for Docker environments and general system stability",
+                "title": "🔍 Smarter Soulseek Downloads",
+                "description": "Improved search, source management, and download reliability",
                 "features": [
-                    "• Docker Streaming Fix - Resolved issues with path resolution when streaming in Docker containers",
-                    "• Low-Memory Optimization - Improved memory usage during long scanning sessions",
-                    "• Settings Persistence - Fixed an issue where Spotify settings wouldn't save correctly",
-                    "• Watchlist Cleanup - Better handling of duplicate entries and cross-platform IDs"
+                    "• Source Reuse - After the first track downloads from a source, subsequent album tracks reuse the same source for consistency",
+                    "• Enhanced Search Queries - Fourth search query added for better matching with cleaned and artist-removed searches",
+                    "• Improved Error Handling - Better detection of rejected/errored states from Soulseek sources",
+                    "• Race Condition Fix - Resolved post-processing conflicts between Stream Processor and Verification Worker"
+                ]
+            },
+            {
+                "title": "🛠️ Stability & Fixes",
+                "description": "Bug fixes and reliability improvements across the board",
+                "features": [
+                    "• Fixed failed tracks not being added to wishlist after batch completion",
+                    "• Fixed album splitting in media servers for multi-source downloads",
+                    "• Fixed regex issue where '&' in track names was incorrectly scrubbed",
+                    "• Fixed source file removal timing on Windows",
+                    "• App log rotation with capped file size to prevent unbounded log growth"
                 ]
             }
         ]

webui/index.html

@@ -131,7 +131,7 @@
 
             <!-- Version Section -->
             <div class="version-section">
-                <button class="version-button" onclick="showVersionInfo()">v1.4</button>
+                <button class="version-button" onclick="showVersionInfo()">v1.5</button>
             </div>
 
             <!-- Status Section -->
@@ -2620,11 +2620,20 @@
 
                                 <!-- AcoustID Settings -->
                                 <div class="api-service-frame">
-                                    <h4 class="service-title acoustid-title">AcoustID</h4>
+                                    <h4 class="service-title acoustid-title">AcoustID Verification</h4>
+                                    <div class="form-group" style="margin-bottom: 12px;">
+                                        <label class="checkbox-label" style="display: flex; align-items: center; gap: 8px; cursor: pointer;">
+                                            <input type="checkbox" id="acoustid-enabled" style="width: 16px; height: 16px;">
+                                            <span>Enable Download Verification</span>
+                                        </label>
+                                        <div style="color: #888; font-size: 0.8em; margin-top: 4px; margin-left: 24px;">
+                                            Verifies downloaded audio matches expected track using fingerprints
+                                        </div>
+                                    </div>
                                     <div class="form-group">
                                         <label>API Key:</label>
                                         <input type="password" id="acoustid-api-key"
-                                            placeholder="AcoustID API Key (Optional)">
+                                            placeholder="AcoustID API Key">
                                     </div>
                                     <div class="callback-info">
                                         <div class="callback-help">Get your free API key from <a
@@ -2632,8 +2641,8 @@
                                                 style="color: #ba55d3;">AcoustID Applications</a></div>
                                         <div class="callback-help"
                                             style="opacity: 0.7; font-size: 0.85em; margin-top: 4px;">
-                                            Optional: Enables audio fingerprint verification of downloads. If not
-                                            provided, verification is skipped.
+                                            The fpcalc fingerprint tool is automatically downloaded if needed.
+                                            Failed verifications move files to Quarantine folder.
                                         </div>
                                     </div>
                                 </div>
@@ -2647,6 +2656,8 @@
                                         Soulseek</button>
                                     <button class="test-button" onclick="testConnection('listenbrainz')">Test
                                         ListenBrainz</button>
+                                    <button class="test-button" onclick="testConnection('acoustid')">Test
+                                        AcoustID</button>
                                 </div>
                             </div>
 

webui/static/script.js

@@ -1682,6 +1682,7 @@ async function loadSettingsData() {
 
         // Populate AcoustID settings
         document.getElementById('acoustid-api-key').value = settings.acoustid?.api_key || '';
+        document.getElementById('acoustid-enabled').checked = settings.acoustid?.enabled || false;
 
         // Populate Download settings (right column)
         document.getElementById('download-path').value = settings.soulseek?.download_path || './downloads';
@@ -2082,7 +2083,8 @@ async function saveSettings() {
             token: document.getElementById('listenbrainz-token').value
         },
         acoustid: {
-            api_key: document.getElementById('acoustid-api-key').value
+            api_key: document.getElementById('acoustid-api-key').value,
+            enabled: document.getElementById('acoustid-enabled').checked
         },
         download_source: {
             mode: document.getElementById('download-source-mode').value,