/// <inheritdoc />
public async Task <MediaStreamInfoSet> GetVideoMediaStreamInfosAsync(string videoId)
{
videoId.EnsureNotNull(nameof(videoId));
if (!ValidateVideoId(videoId))
{
throw new ArgumentException($"Invalid YouTube video ID [{videoId}].", nameof(videoId));
}
// Get player context
var playerContext = await GetVideoPlayerContextAsync(videoId).ConfigureAwait(false);
// Get video info
var videoInfo = await GetVideoInfoAsync(videoId, playerContext.Sts).ConfigureAwait(false);
// Check if requires purchase
if (videoInfo.ContainsKey("ypc_vid"))
{
var previewVideoId = videoInfo["ypc_vid"];
throw new VideoRequiresPurchaseException(videoId, previewVideoId);
}
// Prepare stream info collections
var muxedStreamInfoMap = new Dictionary <int, MuxedStreamInfo>();
var audioStreamInfoMap = new Dictionary <int, AudioStreamInfo>();
var videoStreamInfoMap = new Dictionary <int, VideoStreamInfo>();
// Resolve muxed streams
var muxedStreamInfosEncoded = videoInfo.GetOrDefault("url_encoded_fmt_stream_map");
if (muxedStreamInfosEncoded.IsNotBlank())
{
foreach (var streamEncoded in muxedStreamInfosEncoded.Split(","))
{
var streamInfoDic = UrlExtensions.SplitQuery(streamEncoded);
// Extract values
var itag = streamInfoDic["itag"].ParseInt();
var url = streamInfoDic["url"];
var sig = streamInfoDic.GetOrDefault("s");
#if RELEASE
if (!MediaStreamInfo.IsKnown(itag))
{
continue;
}
#endif
// Decipher signature if needed
if (sig.IsNotBlank())
{
var playerSource =
await GetVideoPlayerSourceAsync(playerContext.SourceUrl).ConfigureAwait(false);
sig = playerSource.Decipher(sig);
url = UrlExtensions.SetQueryParameter(url, "signature", sig);
}
// Probe stream and get content length
long contentLength;
using (var response = await _httpClient.HeadAsync(url).ConfigureAwait(false))
{
// Some muxed streams can be gone
if (response.StatusCode == HttpStatusCode.NotFound ||
response.StatusCode == HttpStatusCode.Gone)
{
continue;
}
// Ensure success
response.EnsureSuccessStatusCode();
// Extract content length
contentLength = response.Content.Headers.ContentLength ??
throw new ParseException("Could not extract content length of muxed stream.");
}
var streamInfo = new MuxedStreamInfo(itag, url, contentLength);
muxedStreamInfoMap[itag] = streamInfo;
}
}
// Resolve adaptive streams
var adaptiveStreamInfosEncoded = videoInfo.GetOrDefault("adaptive_fmts");
if (adaptiveStreamInfosEncoded.IsNotBlank())
{
foreach (var streamEncoded in adaptiveStreamInfosEncoded.Split(","))
{
var streamInfoDic = UrlExtensions.SplitQuery(streamEncoded);
// Extract values
var itag = streamInfoDic["itag"].ParseInt();
var url = streamInfoDic["url"];
var sig = streamInfoDic.GetOrDefault("s");
var contentLength = streamInfoDic["clen"].ParseLong();
var bitrate = streamInfoDic["bitrate"].ParseLong();
#if RELEASE
if (!MediaStreamInfo.IsKnown(itag))
{
continue;
}
#endif
// Decipher signature if needed
if (sig.IsNotBlank())
{
var playerSource =
await GetVideoPlayerSourceAsync(playerContext.SourceUrl).ConfigureAwait(false);
sig = playerSource.Decipher(sig);
url = UrlExtensions.SetQueryParameter(url, "signature", sig);
}
// Check if audio
var isAudio = streamInfoDic["type"].Contains("audio/");
// If audio stream
if (isAudio)
{
var streamInfo = new AudioStreamInfo(itag, url, contentLength, bitrate);
audioStreamInfoMap[itag] = streamInfo;
}
// If video stream
else
{
// Parse additional data
var size = streamInfoDic["size"];
var width = size.SubstringUntil("x").ParseInt();
var height = size.SubstringAfter("x").ParseInt();
var resolution = new VideoResolution(width, height);
var framerate = streamInfoDic["fps"].ParseInt();
var qualityLabel = streamInfoDic["quality_label"];
var streamInfo = new VideoStreamInfo(itag, url, contentLength, bitrate, resolution, framerate,
qualityLabel);
videoStreamInfoMap[itag] = streamInfo;
}
}
}
// Resolve dash streams
var dashManifestUrl = videoInfo.GetOrDefault("dashmpd");
if (dashManifestUrl.IsNotBlank())
{
// Parse signature
var sig = Regex.Match(dashManifestUrl, @"/s/(.*?)(?:/|$)").Groups[1].Value;
// Decipher signature if needed
if (sig.IsNotBlank())
{
var playerSource = await GetVideoPlayerSourceAsync(playerContext.SourceUrl).ConfigureAwait(false);
sig = playerSource.Decipher(sig);
dashManifestUrl = UrlExtensions.SetRouteParameter(dashManifestUrl, "signature", sig);
}
// Get the manifest
var response = await _httpClient.GetStringAsync(dashManifestUrl).ConfigureAwait(false);
var dashManifestXml = XElement.Parse(response).StripNamespaces();
var streamsXml = dashManifestXml.Descendants("Representation");
// Parse streams
foreach (var streamXml in streamsXml)
{
// Skip partial streams
if (streamXml.Descendants("Initialization").FirstOrDefault()?.Attribute("sourceURL")?.Value
.Contains("sq/") == true)
{
continue;
}
// Extract values
var itag = (int)streamXml.Attribute("id");
var url = (string)streamXml.Element("BaseURL");
var bitrate = (long)streamXml.Attribute("bandwidth");
#if RELEASE
if (!MediaStreamInfo.IsKnown(itag))
{
continue;
}
#endif
// Parse content length
var contentLength = Regex.Match(url, @"clen[/=](\d+)").Groups[1].Value.ParseLong();
// Check if audio stream
var isAudio = streamXml.Element("AudioChannelConfiguration") != null;
// If audio stream
if (isAudio)
{
var streamInfo = new AudioStreamInfo(itag, url, contentLength, bitrate);
audioStreamInfoMap[itag] = streamInfo;
}
// If video stream
else
{
// Parse additional data
var width = (int)streamXml.Attribute("width");
var height = (int)streamXml.Attribute("height");
var resolution = new VideoResolution(width, height);
var framerate = (int)streamXml.Attribute("frameRate");
var streamInfo = new VideoStreamInfo(itag, url, contentLength, bitrate, resolution, framerate);
videoStreamInfoMap[itag] = streamInfo;
}
}
}
// Get the raw HLS stream playlist (*.m3u8)
var hlsLiveStreamUrl = videoInfo.GetOrDefault("hlsvp");
// Finalize stream info collections
var muxedStreamInfos = muxedStreamInfoMap.Values.OrderByDescending(s => s.VideoQuality).ToArray();
var audioStreamInfos = audioStreamInfoMap.Values.OrderByDescending(s => s.Bitrate).ToArray();
var videoStreamInfos = videoStreamInfoMap.Values.OrderByDescending(s => s.VideoQuality).ToArray();
return(new MediaStreamInfoSet(muxedStreamInfos, audioStreamInfos, videoStreamInfos, hlsLiveStreamUrl));
}