277 lines
8.3 KiB
Dart
277 lines
8.3 KiB
Dart
import '../utils/app_logger.dart';
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import '../utils/codec_utils.dart';
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import '../utils/track_label_builder.dart' show buildTrackLabel;
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class PlexMediaInfo {
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final String videoUrl;
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final List<PlexAudioTrack> audioTracks;
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final List<PlexSubtitleTrack> subtitleTracks;
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final List<PlexChapter> chapters;
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final int? partId;
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PlexMediaInfo({
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required this.videoUrl,
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required this.audioTracks,
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required this.subtitleTracks,
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required this.chapters,
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this.partId,
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});
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int? getPartId() => partId;
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/// Creates a [PlexMediaInfo] from cached metadata JSON (as stored by [PlexApiCache]).
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/// Parses audio/subtitle tracks from `Media[0].Part[0].Stream[]` so that
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/// offline playback can still apply language-based track selection.
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static PlexMediaInfo? fromMetadataJson(Map<String, dynamic> metadata) {
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final media = metadata['Media'] as List<dynamic>?;
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if (media == null || media.isEmpty) return null;
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final parts = media.first['Part'] as List<dynamic>?;
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if (parts == null || parts.isEmpty) return null;
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final streams = parts.first['Stream'] as List<dynamic>?;
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final audioTracks = <PlexAudioTrack>[];
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final subtitleTracks = <PlexSubtitleTrack>[];
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if (streams != null) {
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for (final s in streams) {
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try {
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final streamType = s['streamType'] as int?;
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if (streamType == 2) {
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audioTracks.add(PlexAudioTrack(
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id: s['id'] as int,
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index: s['index'] as int?,
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codec: s['codec'] as String?,
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language: s['language'] as String?,
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languageCode: s['languageCode'] as String?,
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title: s['title'] as String?,
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displayTitle: s['displayTitle'] as String?,
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channels: s['channels'] as int?,
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selected: s['selected'] == 1 || s['selected'] == true,
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));
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} else if (streamType == 3) {
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subtitleTracks.add(PlexSubtitleTrack(
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id: s['id'] as int,
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index: s['index'] as int?,
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codec: s['codec'] as String?,
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language: s['language'] as String?,
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languageCode: s['languageCode'] as String?,
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title: s['title'] as String?,
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displayTitle: s['displayTitle'] as String?,
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selected: s['selected'] == 1 || s['selected'] == true,
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forced: s['forced'] == 1,
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key: s['key'] as String?,
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));
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}
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} catch (e) {
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appLogger.d('Skipping malformed stream in cached metadata', error: e);
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}
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}
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}
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return PlexMediaInfo(
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videoUrl: '',
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audioTracks: audioTracks,
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subtitleTracks: subtitleTracks,
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chapters: const [],
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);
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}
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}
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/// Mixin for building track labels with a consistent pattern.
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///
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/// Used by [PlexAudioTrack] and [PlexSubtitleTrack] to provide a [buildLabel]
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/// method that delegates to the shared [buildTrackLabel] function.
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mixin _TrackLabelMixin {
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int get id;
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int? get index;
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String? get displayTitle;
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String? get language;
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/// Builds a label from the given parts
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/// If displayTitle is present, returns it
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/// Otherwise, combines language and additional parts
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String buildLabel(List<String> additionalParts) {
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if (displayTitle != null && displayTitle!.isNotEmpty) {
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return displayTitle!;
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}
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return buildTrackLabel(language: language, extraParts: additionalParts, index: (index ?? id) - 1);
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}
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}
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class PlexAudioTrack with _TrackLabelMixin {
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@override
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final int id;
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@override
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final int? index;
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final String? codec;
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@override
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final String? language;
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final String? languageCode;
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final String? title;
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@override
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final String? displayTitle;
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final int? channels;
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final bool selected;
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PlexAudioTrack({
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required this.id,
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this.index,
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this.codec,
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this.language,
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this.languageCode,
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this.title,
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this.displayTitle,
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this.channels,
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required this.selected,
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});
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String get label {
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final additionalParts = <String>[];
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if (codec != null) additionalParts.add(CodecUtils.formatAudioCodec(codec!));
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if (channels != null) additionalParts.add('${channels!}ch');
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return buildLabel(additionalParts);
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}
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}
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class PlexSubtitleTrack with _TrackLabelMixin {
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@override
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final int id;
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@override
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final int? index;
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final String? codec;
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@override
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final String? language;
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final String? languageCode;
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final String? title;
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@override
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final String? displayTitle;
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final bool selected;
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final bool forced;
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final String? key;
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PlexSubtitleTrack({
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required this.id,
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this.index,
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this.codec,
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this.language,
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this.languageCode,
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this.title,
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this.displayTitle,
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required this.selected,
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required this.forced,
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this.key,
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});
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String get label {
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final additionalParts = <String>[];
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if (forced) additionalParts.add('Forced');
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return buildLabel(additionalParts);
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}
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/// Returns true if this subtitle track is an external file (sidecar subtitle)
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/// External subtitles have a key property that points to /library/streams/{id}
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bool get isExternal => key != null && key!.isNotEmpty;
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/// Constructs the full URL for fetching external subtitle files
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/// Returns null if this is not an external subtitle
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String? getSubtitleUrl(String baseUrl, String token) {
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if (!isExternal) return null;
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// Determine file extension based on codec
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final ext = CodecUtils.getSubtitleExtension(codec);
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// Construct URL with authentication token
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return '$baseUrl$key.$ext?X-Plex-Token=$token';
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}
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}
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class PlexChapter {
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final int id;
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final int? index;
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final int? startTimeOffset;
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final int? endTimeOffset;
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final String? title;
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final String? thumb;
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PlexChapter({required this.id, this.index, this.startTimeOffset, this.endTimeOffset, this.title, this.thumb});
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String get label => title ?? 'Chapter ${(index ?? 0) + 1}';
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Duration get startTime => Duration(milliseconds: startTimeOffset ?? 0);
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Duration? get endTime => endTimeOffset != null ? Duration(milliseconds: endTimeOffset!) : null;
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}
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class PlexMarker {
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final int id;
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final String type;
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final int startTimeOffset;
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final int endTimeOffset;
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PlexMarker({required this.id, required this.type, required this.startTimeOffset, required this.endTimeOffset});
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Duration get startTime => Duration(milliseconds: startTimeOffset);
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Duration get endTime => Duration(milliseconds: endTimeOffset);
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bool get isIntro => type == 'intro';
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bool get isCredits => type == 'credits';
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bool containsPosition(Duration position) {
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final posMs = position.inMilliseconds;
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return posMs >= startTimeOffset && posMs < endTimeOffset;
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}
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}
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/// Combined chapters and markers fetched in a single API call
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class PlaybackExtras {
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final List<PlexChapter> chapters;
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final List<PlexMarker> markers;
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PlaybackExtras({required this.chapters, required this.markers});
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static final _introPattern = RegExp(
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r'(?:^|\b)(?:intro(?:duction)?|opening)(?:\b|$)|^op(?:\s?\d+)?$',
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caseSensitive: false,
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);
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static final _creditsPattern = RegExp(
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r'(?:^|\b)(?:outro|closing|credits?|ending)(?:\b|$)|^ed(?:\s?\d+)?$',
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caseSensitive: false,
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);
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static String? _classifyChapterTitle(String title) {
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if (_introPattern.hasMatch(title)) return 'intro';
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if (_creditsPattern.hasMatch(title)) return 'credits';
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return null;
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}
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/// Returns [PlaybackExtras] using real markers when available, otherwise
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/// synthesises markers from chapter titles matching intro/credits patterns.
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factory PlaybackExtras.withChapterFallback({
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required List<PlexChapter> chapters,
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required List<PlexMarker> markers,
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}) {
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if (markers.isNotEmpty) {
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return PlaybackExtras(chapters: chapters, markers: markers);
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}
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final synthetic = <PlexMarker>[];
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for (var i = 0; i < chapters.length; i++) {
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final ch = chapters[i];
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final title = ch.title;
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if (title == null || title.isEmpty) continue;
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final type = _classifyChapterTitle(title);
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if (type == null) continue;
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final start = ch.startTimeOffset;
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if (start == null) continue;
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final end = ch.endTimeOffset ??
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(i + 1 < chapters.length ? chapters[i + 1].startTimeOffset : null);
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if (end == null) continue;
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synthetic.add(PlexMarker(id: ch.id, type: type, startTimeOffset: start, endTimeOffset: end));
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}
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return PlaybackExtras(chapters: chapters, markers: synthetic);
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}
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}
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