96 lines
3.5 KiB
Dart
96 lines
3.5 KiB
Dart
import 'package:xml/xml.dart' as xml;
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import '../../extensions/helpers_extension.dart';
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import '../../reverse_engineering/responses/responses.dart'
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hide ClosedCaption, ClosedCaptionPart, ClosedCaptionTrack;
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import '../../reverse_engineering/youtube_http_client.dart';
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import '../videos.dart';
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import 'closed_caption.dart';
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import 'closed_caption_format.dart';
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import 'closed_caption_manifest.dart';
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import 'closed_caption_part.dart';
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import 'closed_caption_track.dart';
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import 'closed_caption_track_info.dart';
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import 'language.dart';
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/// Queries related to closed captions of YouTube videos.
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class ClosedCaptionClient {
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final YoutubeHttpClient _httpClient;
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/// Initializes an instance of [ClosedCaptionClient]
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ClosedCaptionClient(this._httpClient);
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/// Gets the manifest that contains information
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/// about available closed caption tracks in the specified video.
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Future<ClosedCaptionManifest> getManifest(dynamic videoId,
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{bool autoGenerated = false}) async {
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videoId = VideoId.fromString(videoId);
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var tracks = <ClosedCaptionTrackInfo>[];
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if (!autoGenerated) {
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var subList = await _httpClient.get(
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'https://video.google.com/timedtext?hl=en&type=list&v=${videoId.value}',
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validate: true);
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// ignore: deprecated_member_use
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var content = xml.parse(subList.body);
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var langList = <String>[];
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for (var track in content.findAllElements('track')) {
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var lang = track.getAttribute('lang_code');
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if (langList.contains(lang)) {
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continue;
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}
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langList.add(lang);
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for (var ext in ClosedCaptionFormat.values) {
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tracks.add(ClosedCaptionTrackInfo(
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Uri.parse('https://www.youtube.com/api/timedtext')
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.replaceQueryParameters({
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'lang': lang,
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'v': videoId.value,
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'fmt': ext.formatCode,
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'name': track.getAttribute('name'),
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}),
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Language(lang, track.getAttribute('lang_translated')),
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format: ext));
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}
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}
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if (langList.isEmpty) {
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return ClosedCaptionManifest([]);
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}
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return ClosedCaptionManifest(tracks);
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} else {
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var videoInfoResponse =
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await VideoInfoResponse.get(_httpClient, videoId.value);
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var playerResponse = videoInfoResponse.playerResponse;
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for (var track in playerResponse.closedCaptionTrack) {
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for (var ext in ClosedCaptionFormat.values) {
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tracks.add(ClosedCaptionTrackInfo(
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Uri.parse(track.url)
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.replaceQueryParameters({'fmt': ext.formatCode}),
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Language(track.languageCode, track.languageName),
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isAutoGenerated: track.autoGenerated,
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format: ext));
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}
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}
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}
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return ClosedCaptionManifest(tracks);
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}
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/// Gets the actual closed caption track which is
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/// identified by the specified metadata.
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Future<ClosedCaptionTrack> get(ClosedCaptionTrackInfo trackInfo) async {
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var response = await ClosedCaptionTrackResponse.get(
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_httpClient, trackInfo.url);
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var captions = response.closedCaptions
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.where((e) => !e.text.isNullOrWhiteSpace)
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.map((e) => ClosedCaption(e.text, e.offset, e.duration,
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e.getParts().map((f) => ClosedCaptionPart(f.text, f.offset))));
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return ClosedCaptionTrack(captions);
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}
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/// Returns the subtitles as a string.
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Future<String> getSubTitles(ClosedCaptionTrackInfo trackInfo) =>
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_httpClient.getString(trackInfo.url);
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}
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