/// <inheritdoc />
public async Task DownloadClosedCaptionTrackAsync(ClosedCaptionTrackInfo info, Stream output,
IProgress <double>?progress = null, CancellationToken cancellationToken = default)
{
// Get the track
var track = await GetClosedCaptionTrackAsync(info).ConfigureAwait(false);
// Save to file as SRT
using var writer = new StreamWriter(output, Encoding.UTF8, 1024, true);
for (var i = 0; i < track.Captions.Count; i++)
{
// Make sure cancellation was not requested
cancellationToken.ThrowIfCancellationRequested();
var caption = track.Captions[i];
var buffer = new StringBuilder();
// Line number
buffer.AppendLine((i + 1).ToString());
// Time start --> time end
buffer.Append(caption.Offset.ToString(@"hh\:mm\:ss\,fff"));
buffer.Append(" --> ");
buffer.Append((caption.Offset + caption.Duration).ToString(@"hh\:mm\:ss\,fff"));
buffer.AppendLine();
// Actual text
buffer.AppendLine(caption.Text);
// Write to stream
await writer.WriteLineAsync(buffer.ToString()).ConfigureAwait(false);
// Report progress
progress?.Report((i + 1.0) / track.Captions.Count);
}
}
/// <inheritdoc />
public async Task <ClosedCaptionTrack> GetClosedCaptionTrackAsync(ClosedCaptionTrackInfo info)
{
info.GuardNotNull(nameof(info));
// Get manifest
var raw = await _httpClient.GetStringAsync(info.Url).ConfigureAwait(false);
var trackXml = XElement.Parse(raw).StripNamespaces();
// Parse captions
var captions = new List <ClosedCaption>();
foreach (var captionXml in trackXml.Descendants("p"))
{
var text = (string)captionXml;
if (text.IsBlank())
{
continue; // some autogenerated captions are blank
}
var offset = TimeSpan.FromMilliseconds((double)captionXml.Attribute("t"));
var duration = TimeSpan.FromMilliseconds((double)captionXml.Attribute("d"));
var caption = new ClosedCaption(text, offset, duration);
captions.Add(caption);
}
return(new ClosedCaptionTrack(info, captions));
}
/// <inheritdoc />
public async Task <ClosedCaptionTrack> GetClosedCaptionTrackAsync(ClosedCaptionTrackInfo info)
{
info.GuardNotNull(nameof(info));
// Get parser
var parser = await GetClosedCaptionTrackAjaxParserAsync(info.Url).ConfigureAwait(false);
// Parse captions
var closedCaptions = new List <ClosedCaption>();
foreach (var closedCaptionParser in parser.GetClosedCaptions())
{
// Extract info
var text = closedCaptionParser.ParseText();
// Skip caption tracks without text
if (text.IsBlank())
{
continue;
}
var offset = closedCaptionParser.ParseOffset();
var duration = closedCaptionParser.ParseDuration();
var caption = new ClosedCaption(text, offset, duration);
closedCaptions.Add(caption);
}
return(new ClosedCaptionTrack(info, closedCaptions));
}
/// <inheritdoc />
public async Task <IReadOnlyList <ClosedCaptionTrackInfo> > GetVideoClosedCaptionTrackInfosAsync(string videoId)
{
videoId.GuardNotNull(nameof(videoId));
if (!ValidateVideoId(videoId))
{
throw new ArgumentException($"Invalid YouTube video ID [{videoId}].", nameof(videoId));
}
// Get parser
var parser = await GetPlayerResponseParserAsync(videoId);
// Parse closed caption track infos
var closedCaptionTrackInfos = new List <ClosedCaptionTrackInfo>();
foreach (var closedCaptionTrackInfoParser in parser.GetClosedCaptionTrackInfos())
{
// Parse info
var url = closedCaptionTrackInfoParser.ParseUrl();
var isAutoGenerated = closedCaptionTrackInfoParser.ParseIsAutoGenerated();
// Parse language
var code = closedCaptionTrackInfoParser.ParseLanguageCode();
var name = closedCaptionTrackInfoParser.ParseLanguageName();
var language = new Language(code, name);
// Enforce format to the one we know how to parse
url = UrlEx.SetQueryParameter(url, "format", "3");
var closedCaptionTrackInfo = new ClosedCaptionTrackInfo(url, language, isAutoGenerated);
closedCaptionTrackInfos.Add(closedCaptionTrackInfo);
}
return(closedCaptionTrackInfos);
}
/// <summary>
/// Gets the actual closed caption track represented by given metadata
/// </summary>
public async Task <ClosedCaptionTrack> GetClosedCaptionTrackAsync(ClosedCaptionTrackInfo closedCaptionTrackInfo)
{
if (closedCaptionTrackInfo == null)
{
throw new ArgumentNullException(nameof(closedCaptionTrackInfo));
}
// Get
string response = await _httpService.GetStringAsync(closedCaptionTrackInfo.Url).ConfigureAwait(false);
var captionTrackXml = XElement.Parse(response).StripNamespaces();
// Parse
var captions = new List <ClosedCaption>();
foreach (var captionXml in captionTrackXml.Descendants("text"))
{
string text = captionXml.Value;
var offset = TimeSpan.FromSeconds((double)captionXml.AttributeStrict("start"));
var duration = TimeSpan.FromSeconds((double)captionXml.AttributeStrict("dur"));
var caption = new ClosedCaption(text, offset, duration);
captions.Add(caption);
}
return(new ClosedCaptionTrack(closedCaptionTrackInfo, captions));
}
/// <summary>
/// Writes the closed caption track identified by the specified metadata to the specified writer.
/// </summary>
/// <remarks>
/// Closed captions are written in the SRT file format.
/// </remarks>
public async ValueTask WriteToAsync(
ClosedCaptionTrackInfo trackInfo,
TextWriter writer,
IProgress <double>?progress = null,
CancellationToken cancellationToken = default)
{
var track = await GetAsync(trackInfo, cancellationToken);
var buffer = new StringBuilder();
for (var i = 0; i < track.Captions.Count; i++)
{
var caption = track.Captions[i];
buffer.Clear();
cancellationToken.ThrowIfCancellationRequested();
// Line number
buffer.AppendLine((i + 1).ToString());
// Time start --> time end
buffer.Append(caption.Offset.ToString(@"hh\:mm\:ss\,fff"));
buffer.Append(" --> ");
buffer.Append((caption.Offset + caption.Duration).ToString(@"hh\:mm\:ss\,fff"));
buffer.AppendLine();
// Actual text
buffer.AppendLine(caption.Text);
await writer.WriteLineAsync(buffer.ToString());
progress?.Report((i + 1.0) / track.Captions.Count);
}
}
/// <inheritdoc />
public async Task <ClosedCaptionTrack> GetClosedCaptionTrackAsync(ClosedCaptionTrackInfo info)
{
info.GuardNotNull(nameof(info));
// Get closed caption track XML
var trackXml = await GetClosedCaptionTrackXmlAsync(info.Url).ConfigureAwait(false);
// Get closed captions
var captions = new List <ClosedCaption>();
foreach (var captionXml in trackXml.Descendants("p"))
{
// Extract text
var text = (string)captionXml;
// Skip captions with no text
if (text.IsNullOrWhiteSpace())
{
continue;
}
// Extract timing info
var offset = TimeSpan.FromMilliseconds((double)captionXml.Attribute("t"));
var duration = TimeSpan.FromMilliseconds((double)captionXml.Attribute("d"));
// Add to list
captions.Add(new ClosedCaption(text, offset, duration));
}
return(new ClosedCaptionTrack(info, captions));
}
/// <inheritdoc />
public async Task <ClosedCaptionTrack> GetClosedCaptionTrackAsync(ClosedCaptionTrackInfo info)
{
info.GuardNotNull(nameof(info));
// Get parser
var parser = await GetClosedCaptionTrackAjaxParserAsync(info.Url);
// Parse captions
var closedCaptions = new List <ClosedCaption>();
foreach (var closedCaptionParser in parser.GetClosedCaptions())
{
// Parse info
var text = closedCaptionParser.ParseText();
// Skip empty or whitespace captions
if (text == null || text.IsWhiteSpace())
{
continue;
}
var offset = closedCaptionParser.ParseOffset();
var duration = closedCaptionParser.ParseDuration();
var caption = new ClosedCaption(text, offset, duration);
closedCaptions.Add(caption);
}
return(new ClosedCaptionTrack(info, closedCaptions));
}
public YTCaptionsViewModel(string title, string id, ClosedCaptionTrackInfo item)
{
SearchCommand = new Command(async(text) => await ExecuteSearchCommand((string)text));
trackInfo = item;
VideoTitle = title;
VideoId = id;
}
/// <inheritdoc />
public async Task DownloadClosedCaptionTrackAsync(ClosedCaptionTrackInfo info, string filePath,
IProgress <double> progress = null, CancellationToken cancellationToken = default(CancellationToken))
{
filePath.GuardNotNull(nameof(filePath));
using (var output = File.Create(filePath))
await DownloadClosedCaptionTrackAsync(info, output, progress, cancellationToken).ConfigureAwait(false);
}
/// <summary>
/// Downloads the closed caption track identified by the specified metadata to the specified file.
/// </summary>
/// <remarks>
/// Closed captions are written in the SRT file format.
/// </remarks>
public async ValueTask DownloadAsync(
ClosedCaptionTrackInfo trackInfo,
string filePath,
IProgress <double>?progress = null,
CancellationToken cancellationToken = default)
{
using var writer = File.CreateText(filePath);
await WriteToAsync(trackInfo, writer, progress, cancellationToken);
}
/// <summary>
/// Gets the closed caption track identified by the specified metadata.
/// </summary>
public async ValueTask <ClosedCaptionTrack> GetAsync(
ClosedCaptionTrackInfo trackInfo,
CancellationToken cancellationToken = default)
{
var trackExtractor = await _controller.GetClosedCaptionTrackAsync(trackInfo.Url, cancellationToken);
var captions = trackExtractor
.GetClosedCaptions()
.Select(c =>
{
var text = c.TryGetText();
if (string.IsNullOrWhiteSpace(text))
{
return(null);
}
// Auto-generated captions may have invalid manifests:
// https://github.com/Tyrrrz/YoutubeExplode/discussions/619
if (c.TryGetOffset() is not {
} offset)
{
return(null);
}
if (c.TryGetDuration() is not {
} duration)
{
return(null);
}
var parts = c
.GetParts()
.Select(p =>
{
var partText = p.TryGetText();
if (string.IsNullOrWhiteSpace(partText))
{
return(null);
}
var partOffset =
p.TryGetOffset() ??
throw new YoutubeExplodeException("Could not extract caption part offset.");
return(new ClosedCaptionPart(partText, partOffset));
})
.WhereNotNull()
.ToArray();
return(new ClosedCaption(text, offset, duration, parts));
})
.WhereNotNull()
.ToArray();
return(new ClosedCaptionTrack(captions));
}
public static ClosedCaptionTrack GetClosedCaptionTrack()
{
var info = new ClosedCaptionTrackInfo("test", new CultureInfo("en"), true);
return(new ClosedCaptionTrack(info,
new[]
{
new ClosedCaption("Hello", TimeSpan.Zero, TimeSpan.FromSeconds(1)),
new ClosedCaption("world", TimeSpan.FromSeconds(2), TimeSpan.FromSeconds(1))
}));
}
private ClosedCaptionTrack GetClosedCaptionTrack()
{
var info = new ClosedCaptionTrackInfo("test", new Language("en", "English (auto-generated)"), true);
return(new ClosedCaptionTrack(info,
new[]
{
new ClosedCaption("Hello", TimeSpan.Zero, TimeSpan.FromSeconds(1)),
new ClosedCaption("world", TimeSpan.FromSeconds(2), TimeSpan.FromSeconds(1))
}));
}
/// <inheritdoc />
public List <ClosedCaptionTrackInfo> GetVideoClosedCaptionTrackInfosAsync(string videoId)
{
videoId.GuardNotNull(nameof(videoId));
if (!ValidateVideoId(videoId))
{
throw new ArgumentException($"Invalid YouTube video ID [{videoId}].", nameof(videoId));
}
// Get video info
var videoInfo = GetVideoInfoAsync(videoId); //.ConfigureAwait(false);
if (videoInfo == null)
{
return new List <ClosedCaptionTrackInfo>()
{
}
}
;
// Extract captions metadata
var playerResponseRaw = videoInfo["player_response"];
var playerResponseJson = JToken.Parse(playerResponseRaw);
var captionTracksJson = playerResponseJson.SelectToken("$..captionTracks").EmptyIfNull();
// Parse closed caption tracks
var closedCaptionTrackInfos = new List <ClosedCaptionTrackInfo>();
foreach (var captionTrackJson in captionTracksJson)
{
// Extract values
var code = captionTrackJson["languageCode"].Value <string>();
var name = captionTrackJson["name"]["simpleText"].Value <string>();
var language = new Language(code, name);
var isAuto = captionTrackJson["vssId"].Value <string>()
.StartsWith("a.", StringComparison.OrdinalIgnoreCase);
var url = captionTrackJson["baseUrl"].Value <string>();
// Enforce format
url = UrlEx.SetQueryParameter(url, "format", "3");
var closedCaptionTrackInfo = new ClosedCaptionTrackInfo(url, language, isAuto);
closedCaptionTrackInfos.Add(closedCaptionTrackInfo);
}
return(closedCaptionTrackInfos);
}
}
private void ParseClosedCaptionTrackInfos(string encodedData,
ICollection <ClosedCaptionTrackInfo> closedCaptionTrackInfos)
{
foreach (var captionEncoded in encodedData.Split(","))
{
var captionInfoDic = UrlHelper.GetDictionaryFromUrlQuery(captionEncoded);
var url = captionInfoDic.Get("u");
var code = captionInfoDic.Get("lc");
var name = captionInfoDic.Get("n");
var language = new Language(code, name);
var isAuto = captionInfoDic.Get("v").Contains("a.");
var closedCaptionTrackInfo = new ClosedCaptionTrackInfo(url, language, isAuto);
closedCaptionTrackInfos.Add(closedCaptionTrackInfo);
}
}
/// <inheritdoc />
public void DownloadClosedCaptionTrackAsync(ClosedCaptionTrackInfo info, Stream output,
//IProgress<double> progress = null,
CancellationToken cancellationToken = default(CancellationToken))
{
info.GuardNotNull(nameof(info));
output.GuardNotNull(nameof(output));
// Get the track
var track = GetClosedCaptionTrackAsync(info); //.ConfigureAwait(false);
// Save to file as SRT
//using (var writer = new StreamWriter(output, Encoding.UTF8, 1024, true))
using (var writer = new StreamWriter(output, Encoding.UTF8, 1024))
{
for (var i = 0; i < track.Captions.Count; i++)
{
// Make sure cancellation was not requested
cancellationToken.ThrowIfCancellationRequested();
var caption = track.Captions[i];
var buffer = new StringBuilder();
// Line number
buffer.AppendLine((i + 1).ToString());
//// Time start --> time end
//buffer.Append(caption.Offset.ToString(@"hh\:mm\:ss\,fff"));
//buffer.Append(" --> ");
//buffer.Append((caption.Offset + caption.Duration).ToString(@"hh\:mm\:ss\,fff"));
//buffer.AppendLine();
// Actual text
buffer.AppendLine(caption.Text);
// Write to stream
//await writer.WriteLineAsync(buffer.ToString()).ConfigureAwait(false);
writer.WriteLine(buffer.ToString());
// Report progress
//progress?.Report((i + 1.0) / track.Captions.Count);
}
}
}
/// <summary>
/// Gets the actual closed caption track associated with given metadata
/// and downloads it as SRT file.
/// </summary>
public async Task DownloadClosedCaptionTrackAsync(ClosedCaptionTrackInfo info, string filePath,
IProgress <double> progress, CancellationToken cancellationToken)
{
info.GuardNotNull(nameof(info));
filePath.GuardNotNull(nameof(filePath));
// Get the track
var track = await GetClosedCaptionTrackAsync(info).ConfigureAwait(false);
// Save to file as SRT
using (var writer = File.CreateText(filePath))
{
for (var i = 0; i < track.Captions.Count; i++)
{
// Make sure cancellation was not requested
cancellationToken.ThrowIfCancellationRequested();
var caption = track.Captions[i];
var buffer = new StringBuilder();
// Line number
buffer.AppendLine((i + 1).ToString());
// Time start --> time end
buffer.Append(caption.Offset.ToString(@"hh\:mm\:ss\,fff"));
buffer.Append(" --> ");
buffer.Append((caption.Offset + caption.Duration).ToString(@"hh\:mm\:ss\,fff"));
buffer.AppendLine();
// Actual text
buffer.AppendLine(caption.Text);
// Write to stream
await writer.WriteLineAsync(buffer.ToString()).ConfigureAwait(false);
// Report progress
progress?.Report((i + 1.0) / track.Captions.Count);
}
}
}
/// <summary>
/// Gets the actual closed caption track represented by given metadata
/// </summary>
public async Task <ClosedCaptionTrack> GetClosedCaptionTrackAsync(ClosedCaptionTrackInfo info)
{
info.GuardNotNull(nameof(info));
// Get manifest
var response = await _httpService.GetStringAsync(info.Url).ConfigureAwait(false);
var trackXml = XElement.Parse(response).StripNamespaces();
// Parse captions
var captions = new List <ClosedCaption>();
foreach (var captionXml in trackXml.Descendants("text"))
{
var text = captionXml.Value;
var offset = TimeSpan.FromSeconds((double)captionXml.AttributeStrict("start"));
var duration = TimeSpan.FromSeconds((double)captionXml.AttributeStrict("dur"));
var caption = new ClosedCaption(text, offset, duration);
captions.Add(caption);
}
return(new ClosedCaptionTrack(info, captions));
}
/// <inheritdoc />
public async Task DownloadClosedCaptionTrackAsync(ClosedCaptionTrackInfo info, string filePath,
IProgress <double>?progress = null, CancellationToken cancellationToken = default)
{
using var output = File.Create(filePath);
await DownloadClosedCaptionTrackAsync(info, output, progress, cancellationToken).ConfigureAwait(false);
}
/// <summary>
/// Gets video info by ID
/// </summary>
public async Task <VideoInfo> GetVideoInfoAsync(string videoId)
{
if (videoId == null)
{
throw new ArgumentNullException(nameof(videoId));
}
if (!ValidateVideoId(videoId))
{
throw new ArgumentException("Invalid Youtube video ID", nameof(videoId));
}
// Get player context
var playerContext = await GetPlayerContextAsync(videoId).ConfigureAwait(false);
// Get video info
string request = $"https://www.youtube.com/get_video_info?video_id={videoId}&sts={playerContext.Sts}&el=info&ps=default&hl=en";
string response = await _httpService.GetStringAsync(request).ConfigureAwait(false);
var videoInfoDic = UrlHelper.GetDictionaryFromUrlQuery(response);
// Check for error
if (videoInfoDic.ContainsKey("errorcode"))
{
int errorCode = videoInfoDic.Get("errorcode").ParseInt();
string errorReason = videoInfoDic.GetOrDefault("reason");
throw new VideoNotAvailableException(errorCode, errorReason);
}
// Check for paid content
if (videoInfoDic.GetOrDefault("requires_purchase") == "1")
{
throw new VideoRequiresPurchaseException();
}
// Parse metadata
string title = videoInfoDic.Get("title");
var duration = TimeSpan.FromSeconds(videoInfoDic.Get("length_seconds").ParseDouble());
long viewCount = videoInfoDic.Get("view_count").ParseLong();
var keywords = videoInfoDic.Get("keywords").Split(",");
var watermarks = videoInfoDic.Get("watermark").Split(",");
bool isListed = videoInfoDic.Get("is_listed") == "1";
bool isRatingAllowed = videoInfoDic.Get("allow_ratings") == "1";
bool isMuted = videoInfoDic.Get("muted") == "1";
bool isEmbeddingAllowed = videoInfoDic.Get("allow_embed") == "1";
// Parse mixed streams
var mixedStreams = new List <MixedStreamInfo>();
string mixedStreamsEncoded = videoInfoDic.GetOrDefault("url_encoded_fmt_stream_map");
if (mixedStreamsEncoded.IsNotBlank())
{
foreach (string streamEncoded in mixedStreamsEncoded.Split(","))
{
var streamDic = UrlHelper.GetDictionaryFromUrlQuery(streamEncoded);
int itag = streamDic.Get("itag").ParseInt();
#if RELEASE
// Skip unknown itags on RELEASE
if (!MediaStreamInfo.IsKnown(itag))
{
continue;
}
#endif
string url = streamDic.Get("url");
string sig = streamDic.GetOrDefault("s");
// Decipher signature if needed
if (sig.IsNotBlank())
{
var playerSource = await GetPlayerSourceAsync(playerContext.Version).ConfigureAwait(false);
sig = playerSource.Decipher(sig);
url = UrlHelper.SetUrlQueryParameter(url, "signature", sig);
}
// Get content length
long contentLength;
using (var reqMsg = new HttpRequestMessage(HttpMethod.Head, url))
using (var resMsg = await _httpService.PerformRequestAsync(reqMsg).ConfigureAwait(false))
{
// Check status code (https://github.com/Tyrrrz/YoutubeExplode/issues/36)
if (resMsg.StatusCode == HttpStatusCode.NotFound ||
resMsg.StatusCode == HttpStatusCode.Gone)
{
continue;
}
// Ensure success
resMsg.EnsureSuccessStatusCode();
// Extract content length
contentLength = resMsg.Content.Headers.ContentLength ?? -1;
if (contentLength < 0)
{
throw new ParseException("Could not extract content length");
}
}
// Set rate bypass
url = UrlHelper.SetUrlQueryParameter(url, "ratebypass", "yes");
var stream = new MixedStreamInfo(itag, url, contentLength);
mixedStreams.Add(stream);
}
}
// Parse adaptive streams
var audioStreams = new List <AudioStreamInfo>();
var videoStreams = new List <VideoStreamInfo>();
string adaptiveStreamsEncoded = videoInfoDic.GetOrDefault("adaptive_fmts");
if (adaptiveStreamsEncoded.IsNotBlank())
{
foreach (string streamEncoded in adaptiveStreamsEncoded.Split(","))
{
var streamDic = UrlHelper.GetDictionaryFromUrlQuery(streamEncoded);
int itag = streamDic.Get("itag").ParseInt();
#if RELEASE
// Skip unknown itags on RELEASE
if (!MediaStreamInfo.IsKnown(itag))
{
continue;
}
#endif
string url = streamDic.Get("url");
string sig = streamDic.GetOrDefault("s");
long contentLength = streamDic.Get("clen").ParseLong();
long bitrate = streamDic.Get("bitrate").ParseLong();
// Decipher signature if needed
if (sig.IsNotBlank())
{
var playerSource = await GetPlayerSourceAsync(playerContext.Version).ConfigureAwait(false);
sig = playerSource.Decipher(sig);
url = UrlHelper.SetUrlQueryParameter(url, "signature", sig);
}
// Set rate bypass
url = UrlHelper.SetUrlQueryParameter(url, "ratebypass", "yes");
// Check if audio
bool isAudio = streamDic.Get("type").Contains("audio/");
// If audio stream
if (isAudio)
{
var stream = new AudioStreamInfo(itag, url, contentLength, bitrate);
audioStreams.Add(stream);
}
// If video stream
else
{
// Parse additional data
string size = streamDic.Get("size");
int width = size.SubstringUntil("x").ParseInt();
int height = size.SubstringAfter("x").ParseInt();
var resolution = new VideoResolution(width, height);
double framerate = streamDic.Get("fps").ParseDouble();
var stream = new VideoStreamInfo(itag, url, contentLength, bitrate, resolution, framerate);
videoStreams.Add(stream);
}
}
}
// Parse adaptive streams from dash
string dashManifestUrl = videoInfoDic.GetOrDefault("dashmpd");
if (dashManifestUrl.IsNotBlank())
{
// Parse signature
string sig = Regex.Match(dashManifestUrl, @"/s/(.*?)(?:/|$)").Groups[1].Value;
// Decipher signature if needed
if (sig.IsNotBlank())
{
var playerSource = await GetPlayerSourceAsync(playerContext.Version).ConfigureAwait(false);
sig = playerSource.Decipher(sig);
dashManifestUrl = UrlHelper.SetUrlPathParameter(dashManifestUrl, "signature", sig);
}
// Get the manifest
response = await _httpService.GetStringAsync(dashManifestUrl).ConfigureAwait(false);
var dashManifestXml = XElement.Parse(response).StripNamespaces();
var streamsXml = dashManifestXml.Descendants("Representation");
// Filter out partial streams
streamsXml = streamsXml
.Where(x => !(x.Descendant("Initialization")
?.Attribute("sourceURL")
?.Value.Contains("sq/") ?? false));
// Parse streams
foreach (var streamXml in streamsXml)
{
int itag = (int)streamXml.AttributeStrict("id");
#if RELEASE
// Skip unknown itags on RELEASE
if (!MediaStreamInfo.IsKnown(itag))
{
continue;
}
#endif
string url = streamXml.ElementStrict("BaseURL").Value;
long bitrate = (long)streamXml.AttributeStrict("bandwidth");
// Parse content length
long contentLength = Regex.Match(url, @"clen[/=](\d+)").Groups[1].Value.ParseLong();
// Set rate bypass
url = url.Contains("&")
? UrlHelper.SetUrlQueryParameter(url, "ratebypass", "yes")
: UrlHelper.SetUrlPathParameter(url, "ratebypass", "yes");
// Check if audio stream
bool isAudio = streamXml.Element("AudioChannelConfiguration") != null;
// If audio stream
if (isAudio)
{
var stream = new AudioStreamInfo(itag, url, contentLength, bitrate);
audioStreams.Add(stream);
}
// If video stream
else
{
// Parse additional data
int width = (int)streamXml.AttributeStrict("width");
int height = (int)streamXml.AttributeStrict("height");
var resolution = new VideoResolution(width, height);
double framerate = (double)streamXml.AttributeStrict("frameRate");
var stream = new VideoStreamInfo(itag, url, contentLength, bitrate, resolution, framerate);
videoStreams.Add(stream);
}
}
}
// Finalize stream lists
mixedStreams = mixedStreams.Distinct(s => s.Itag).OrderByDescending(s => s.VideoQuality).ToList();
audioStreams = audioStreams.Distinct(s => s.Itag).OrderByDescending(s => s.Bitrate).ToList();
videoStreams = videoStreams.Distinct(s => s.Itag).OrderByDescending(s => s.VideoQuality).ToList();
// Parse closed caption tracks
var captions = new List <ClosedCaptionTrackInfo>();
string captionsEncoded = videoInfoDic.GetOrDefault("caption_tracks");
if (captionsEncoded.IsNotBlank())
{
foreach (string captionEncoded in captionsEncoded.Split(","))
{
var captionDic = UrlHelper.GetDictionaryFromUrlQuery(captionEncoded);
string url = captionDic.Get("u");
bool isAuto = captionDic.Get("v").Contains("a.");
string code = captionDic.Get("lc");
string name = captionDic.Get("n");
var language = new Language(code, name);
var caption = new ClosedCaptionTrackInfo(url, language, isAuto);
captions.Add(caption);
}
}
// Get metadata extension
request = $"https://www.youtube.com/get_video_metadata?video_id={videoId}";
response = await _httpService.GetStringAsync(request).ConfigureAwait(false);
var videoInfoExtXml = XElement.Parse(response).StripNamespaces().ElementStrict("html_content");
// Parse
string description = videoInfoExtXml.ElementStrict("video_info").ElementStrict("description").Value;
long likeCount = (long)videoInfoExtXml.ElementStrict("video_info").ElementStrict("likes_count_unformatted");
long dislikeCount = (long)videoInfoExtXml.ElementStrict("video_info").ElementStrict("dislikes_count_unformatted");
// Parse author info
string authorId = videoInfoExtXml.ElementStrict("user_info").ElementStrict("channel_external_id").Value;
string authorName = videoInfoExtXml.ElementStrict("user_info").ElementStrict("username").Value;
string authorTitle = videoInfoExtXml.ElementStrict("user_info").ElementStrict("channel_title").Value;
bool authorIsPaid = videoInfoExtXml.ElementStrict("user_info").ElementStrict("channel_paid").Value == "1";
string authorLogoUrl = videoInfoExtXml.ElementStrict("user_info").ElementStrict("channel_logo_url").Value;
string authorBannerUrl = videoInfoExtXml.ElementStrict("user_info").ElementStrict("channel_banner_url").Value;
var author = new ChannelInfo(
authorId, authorName, authorTitle,
authorIsPaid, authorLogoUrl, authorBannerUrl);
return(new VideoInfo(
videoId, title, author,
duration, description, keywords, watermarks,
viewCount, likeCount, dislikeCount,
isListed, isRatingAllowed, isMuted, isEmbeddingAllowed,
mixedStreams, audioStreams, videoStreams, captions));
}
/// <summary> /// Gets the actual closed caption track associated with given metadata /// and downloads it as SRT file. /// </summary> public Task DownloadClosedCaptionTrackAsync(ClosedCaptionTrackInfo info, string filePath) => DownloadClosedCaptionTrackAsync(info, filePath, null);
public CaptionsPage(string title, string id, ClosedCaptionTrackInfo info)
{
InitializeComponent();
On <Xamarin.Forms.PlatformConfiguration.iOS>().SetUseSafeArea(true);
BindingContext = viewModel = new YTCaptionsViewModel(title, id, info);
}
public SubtitleInput(ClosedCaptionTrackInfo info, string filePath)
{
Info = info;
FilePath = filePath;
}
/// <summary>
/// Gets the actual closed caption track associated with given metadata
/// and downloads it as SRT file.
/// </summary>
public Task DownloadClosedCaptionTrackAsync(ClosedCaptionTrackInfo info, string filePath,
IProgress <double> progress)
=> DownloadClosedCaptionTrackAsync(info, filePath, progress, CancellationToken.None);
public SubtitleDownloadOption(ClosedCaptionTrackInfo trackInfo)
{
TrackInfo = trackInfo;
}
