/// <summary>
/// Gets the metadata associated with the specified playlist.
/// </summary>
public async Task <Playlist> GetAsync(PlaylistId id)
{
var response = await PlaylistResponse.GetAsync(_httpClient, id);
return(new Playlist(
id,
response.TryGetAuthor(),
response.GetTitle(),
response.TryGetDescription() ?? "",
new Engagement(
response.TryGetViewCount() ?? 0,
response.TryGetLikeCount() ?? 0,
response.TryGetDislikeCount() ?? 0
)
));
}
/// <summary>
/// Enumerates videos included in the specified playlist.
/// </summary>
public async IAsyncEnumerable <PlaylistVideo> GetVideosAsync(PlaylistId id)
{
var encounteredVideoIds = new HashSet <string>();
var continuationToken = "";
while (true)
{
var response = await PlaylistResponse.GetAsync(_httpClient, id, continuationToken);
foreach (var video in response.GetPlaylistVideos())
{
var videoId = video.GetId();
// Skip already encountered videos
if (!encounteredVideoIds.Add(videoId))
{
continue;
}
// Skip deleted videos
if (string.IsNullOrEmpty(video.GetChannelId()))
{
continue;
}
yield return(new PlaylistVideo(
videoId,
video.GetTitle(),
video.GetAuthor(),
video.GetChannelId(),
video.GetDescription(),
video.GetDuration(),
video.GetViewCount(),
new ThumbnailSet(videoId)
));
}
continuationToken = response.TryGetContinuationToken();
if (string.IsNullOrEmpty(continuationToken))
{
break;
}
}
}
/// <summary>
/// Gets the metadata associated with the specified playlist.
/// </summary>
public async Task <Playlist> GetAsync(PlaylistId id)
{
var response = await PlaylistResponse.GetAsync(_httpClient, id);
var thumbnails = response
.GetPlaylistVideos()
.FirstOrDefault()?
.GetId()
.Pipe(i => new ThumbnailSet(i));
return(new Playlist(
id,
response.TryGetTitle() ?? "",
response.TryGetAuthor() ?? "",
response.TryGetDescription() ?? "",
response.TryGetViewCount() ?? 0,
thumbnails
));
}
/// <summary>
/// Enumerates batches of videos included in the specified playlist.
/// </summary>
public async IAsyncEnumerable <Batch <PlaylistVideo> > GetVideoBatchesAsync(
PlaylistId playlistId,
[EnumeratorCancellation] CancellationToken cancellationToken = default)
{
var encounteredIds = new HashSet <string>(StringComparer.Ordinal);
var continuationToken = default(string?);
do
{
var playlistExtractor =
await _controller.GetPlaylistAsync(playlistId, continuationToken, cancellationToken);
var videos = new List <PlaylistVideo>();
foreach (var videoExtractor in playlistExtractor.GetVideos())
{
var videoId =
videoExtractor.TryGetVideoId() ??
throw new YoutubeExplodeException("Could not extract video ID.");
// Don't yield the same video twice
if (!encounteredIds.Add(videoId))
{
continue;
}
var videoTitle =
videoExtractor.TryGetVideoTitle() ??
throw new YoutubeExplodeException("Could not extract video title.");
var videoChannelTitle =
videoExtractor.TryGetVideoAuthor() ??
throw new YoutubeExplodeException("Could not extract video author.");
var videoChannelId =
videoExtractor.TryGetVideoChannelId() ??
throw new YoutubeExplodeException("Could not extract video channel ID.");
var duration = videoExtractor.TryGetVideoDuration();
var thumbnails = videoExtractor
.GetVideoThumbnails()
.Select(t =>
{
var thumbnailUrl =
t.TryGetUrl() ??
throw new YoutubeExplodeException("Could not extract thumbnail URL.");
var thumbnailWidth =
t.TryGetWidth() ??
throw new YoutubeExplodeException("Could not extract thumbnail width.");
var thumbnailHeight =
t.TryGetHeight() ??
throw new YoutubeExplodeException("Could not extract thumbnail height.");
var thumbnailResolution = new Resolution(thumbnailWidth, thumbnailHeight);
return(new Thumbnail(thumbnailUrl, thumbnailResolution));
})
.Concat(Thumbnail.GetDefaultSet(videoId))
.ToArray();
var video = new PlaylistVideo(
videoId,
videoTitle,
new Author(videoChannelId, videoChannelTitle),
duration,
thumbnails
);
videos.Add(video);
}
yield return(Batch.Create(videos));
continuationToken = playlistExtractor.TryGetContinuationToken();
} while (!string.IsNullOrWhiteSpace(continuationToken));
}
/// <summary>
/// Enumerates videos included in the specified playlist.
/// </summary>
public IAsyncEnumerable <PlaylistVideo> GetVideosAsync(
PlaylistId playlistId,
CancellationToken cancellationToken = default) =>
GetVideoBatchesAsync(playlistId, cancellationToken).FlattenAsync();