77 lines
2.8 KiB
Dart
77 lines
2.8 KiB
Dart
import '../media/media_item.dart';
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import '../media/media_server_client.dart';
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import '../media/media_source_info.dart';
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import '../media/media_version.dart';
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import '../models/transcode_quality_preset.dart';
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import 'playback_context.dart';
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import 'playback_initialization_types.dart';
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/// Immutable snapshot of everything that describes the item currently loaded
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/// in the player: the resolver output plus the effective (post-fallback,
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/// post-clamping) source selections.
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///
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/// Built once per resolve and swapped atomically on the screen — failure
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/// before the swap means the previous session (and the state derived from
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/// it) stays untouched, which replaces the old field-by-field
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/// snapshot/rollback bookkeeping.
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class PlaybackSession {
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final PlaybackContext context;
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/// Effective quality preset — the requested preset, downgraded to
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/// original when the backend reported a transcode fallback.
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final TranscodeQualityPreset qualityPreset;
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/// Effective media version id, refined from the resolver's clamped
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/// version index when the version list provides one.
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final String? mediaSourceId;
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const PlaybackSession({required this.context, required this.qualityPreset, this.mediaSourceId});
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/// Derives the effective selections from a resolved [context]:
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/// quality falls back to original when the backend rejected the requested
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/// preset, and the media source id follows the clamped version index.
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factory PlaybackSession.fromContext(
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PlaybackContext context, {
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required TranscodeQualityPreset requestedQualityPreset,
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String? requestedMediaSourceId,
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}) {
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final result = context.result;
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final fellBackToOriginal = result.fallbackReason != null && !requestedQualityPreset.isOriginal;
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return PlaybackSession(
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context: context,
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qualityPreset: fellBackToOriginal ? TranscodeQualityPreset.original : requestedQualityPreset,
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mediaSourceId:
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mediaSourceIdForIndex(result.availableVersions, result.selectedMediaIndex) ?? requestedMediaSourceId,
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);
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}
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static String? mediaSourceIdForIndex(List<MediaVersion> versions, int index) {
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if (index < 0 || index >= versions.length) return null;
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return versions[index].id;
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}
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PlaybackInitializationResult get result => context.result;
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MediaItem get metadata => context.metadata;
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MediaServerClient? get reportingClient => context.reportingClient;
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bool get isTranscoding => result.isTranscoding;
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bool get isOffline => result.isOffline;
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String? get playSessionId => result.playSessionId;
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String? get playMethod => result.playMethod;
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int? get audioStreamId => result.activeAudioStreamId;
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int get mediaIndex => result.selectedMediaIndex;
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List<MediaVersion> get availableVersions => result.availableVersions;
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MediaSourceInfo? get mediaInfo => result.mediaInfo;
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Map<String, String>? get streamHeaders => context.streamHeaders;
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}
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