Hermes (Server)
8b6a04ead8
CRIT: - Tag-Leiste: Toggle-Kopf 'Tags & Filter' eingebaut (war unerreichbar) + TagStats - Profil: Cloud-Count vor Dialog aufloesen (kein 'Instance of Future' mehr) HIGH: - CloudEinstellungen: toten Sync-Timer entfernt (echter Timer im ViewModel) - StatistikCard + RecentWidget jetzt eingebaut (gesamtMB/gesamtMin endlich genutzt) - CloudService als Singleton (konsistenter Token-Zustand in allen Services) MED/LOW: - Playlist-Erkennung nur noch via list= Parameter - Player: fehlende Quelle wird geloggt statt still - song_tile: null-ID-Guard vor Tag-Dialog - Scanner-Log mit Exception-Objekt - FavoritenService: anzahlFavoriten() fuer StatistikCard
92 lines
3.2 KiB
Dart
92 lines
3.2 KiB
Dart
import 'dart:io';
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/// Liest ID3-Tags (v1 + v2) und eingebettetes Cover aus MP3-Dateien
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class Id3Reader {
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/// Gibt Metadaten zurück: titel, kuenstler, album, coverBytes
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static Map<String, dynamic> lesen(String filepath) {
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final result = <String, dynamic>{
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'titel': '',
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'kuenstler': '',
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'album': '',
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'cover': null,
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};
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try {
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final file = File(filepath);
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if (!file.existsSync()) return result;
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final bytes = file.readAsBytesSync();
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// ID3v1 (letzte 128 Bytes)
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if (bytes.length > 128) {
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final tag = bytes.sublist(bytes.length - 128);
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if (String.fromCharCodes(tag.sublist(0, 3)) == 'TAG') {
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result['titel'] = _trimNull(tag.sublist(3, 33)).trim();
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result['kuenstler'] = _trimNull(tag.sublist(33, 63)).trim();
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result['album'] = _trimNull(tag.sublist(63, 93)).trim();
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}
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}
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// ID3v2 Header (Anfang der Datei) für Cover
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if (bytes.length > 10 && String.fromCharCodes(bytes.sublist(0, 3)) == 'ID3') {
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final size = _synchSafeInt(bytes, 6);
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var pos = 10;
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// Frame-Header lesen
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while (pos < size && pos + 10 < bytes.length) {
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final frameId = String.fromCharCodes(bytes.sublist(pos, pos + 4));
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final frameSize = _frameSize(bytes, pos + 4);
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pos += 10;
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if (frameId == 'APIC' && pos + frameSize <= bytes.length) {
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// APIC = Attached Picture
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var p = pos;
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// Encoding (1 Byte) + MIME-Type
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final enc = bytes[p]; p += 1;
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var mimeEnd = p;
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while (mimeEnd < bytes.length && bytes[mimeEnd] != 0) mimeEnd++;
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final mime = String.fromCharCodes(bytes.sublist(p, mimeEnd));
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p = mimeEnd + 1;
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// Picture Type (1 Byte)
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p += 1;
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// Description (null-terminated)
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var descEnd = p;
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while (descEnd < bytes.length) {
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if (enc == 1 || enc == 2) {
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if (descEnd + 1 < bytes.length && bytes[descEnd] == 0 && bytes[descEnd + 1] == 0) break;
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descEnd += 2;
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} else {
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if (bytes[descEnd] == 0) break;
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descEnd += 1;
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}
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}
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p = descEnd + (enc == 1 || enc == 2 ? 2 : 1);
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final remaining = pos + frameSize - p;
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if (remaining > 0 && p + remaining <= bytes.length) {
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result['cover'] = bytes.sublist(p, p + remaining);
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}
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break;
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}
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pos += frameSize;
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}
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}
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} catch (_) {}
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// Fallback: Dateiname als Titel
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if (result['titel'].isEmpty) {
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result['titel'] = filepath.split('/').last.replaceAll('.mp3', '').replaceAll('.m4a', '');
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}
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return result;
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}
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static String _trimNull(List<int> bytes) {
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final end = bytes.indexWhere((b) => b == 0);
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return String.fromCharCodes(end < 0 ? bytes : bytes.sublist(0, end));
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}
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static int _synchSafeInt(List<int> bytes, int offset) {
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return (bytes[offset] << 21) | (bytes[offset + 1] << 14) | (bytes[offset + 2] << 7) | bytes[offset + 3];
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}
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static int _frameSize(List<int> bytes, int offset) {
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return (bytes[offset] << 24) | (bytes[offset + 1] << 16) | (bytes[offset + 2] << 8) | bytes[offset + 3];
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}
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}
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