/// <inheritdoc />
public async Task <MediaStreamInfoSet> GetVideoMediaStreamInfosAsync(string videoId)
{
videoId.GuardNotNull(nameof(videoId));
if (!ValidateVideoId(videoId))
{
throw new ArgumentException($"Invalid YouTube video ID [{videoId}].", nameof(videoId));
}
// Register the time at which the request was made to calculate expiry date later on
var requestedAt = DateTimeOffset.Now;
// Get parser
var parser = await GetPlayerResponseParserAsync(videoId, true);
// Prepare stream info maps
var muxedStreamInfoMap = new Dictionary <int, MuxedStreamInfo>();
var audioStreamInfoMap = new Dictionary <int, AudioStreamInfo>();
var videoStreamInfoMap = new Dictionary <int, VideoStreamInfo>();
// Parse muxed stream infos
foreach (var streamInfoParser in parser.GetMuxedStreamInfos())
{
// Parse info
var itag = streamInfoParser.ParseItag();
var url = streamInfoParser.ParseUrl();
// Try to parse content length, otherwise get it manually
var contentLength = streamInfoParser.ParseContentLength();
if (contentLength <= 0)
{
// Send HEAD request and get content length
contentLength = await _httpClient.GetContentLengthAsync(url, false) ?? -1;
// If content length is still not available - stream is gone or faulty
if (contentLength <= 0)
{
continue;
}
}
// Parse container
var containerStr = streamInfoParser.ParseContainer();
var container = ContainerHelper.ContainerFromString(containerStr);
// Parse audio encoding
var audioEncodingStr = streamInfoParser.ParseAudioEncoding();
var audioEncoding = AudioEncodingHelper.AudioEncodingFromString(audioEncodingStr);
// Parse video encoding
var videoEncodingStr = streamInfoParser.ParseVideoEncoding();
var videoEncoding = VideoEncodingHelper.VideoEncodingFromString(videoEncodingStr);
// Parse video quality label and video quality
var videoQualityLabel = streamInfoParser.ParseVideoQualityLabel();
var videoQuality = VideoQualityHelper.VideoQualityFromLabel(videoQualityLabel);
// Parse resolution
var width = streamInfoParser.ParseWidth();
var height = streamInfoParser.ParseHeight();
var resolution = new VideoResolution(width, height);
// Add stream
var streamInfo = new MuxedStreamInfo(itag, url, container, contentLength, audioEncoding, videoEncoding,
videoQualityLabel, videoQuality, resolution);
muxedStreamInfoMap[itag] = streamInfo;
}
// Parse adaptive stream infos
foreach (var streamInfoParser in parser.GetAdaptiveStreamInfos())
{
// Parse info
var itag = streamInfoParser.ParseItag();
var url = streamInfoParser.ParseUrl();
var bitrate = streamInfoParser.ParseBitrate();
// Try to parse content length, otherwise get it manually
var contentLength = streamInfoParser.ParseContentLength();
if (contentLength <= 0)
{
// Send HEAD request and get content length
contentLength = await _httpClient.GetContentLengthAsync(url, false) ?? -1;
// If content length is still not available - stream is gone or faulty
if (contentLength <= 0)
{
continue;
}
}
// Parse container
var containerStr = streamInfoParser.ParseContainer();
var container = ContainerHelper.ContainerFromString(containerStr);
// If audio-only
if (streamInfoParser.ParseIsAudioOnly())
{
// Parse audio encoding
var audioEncodingStr = streamInfoParser.ParseAudioEncoding();
var audioEncoding = AudioEncodingHelper.AudioEncodingFromString(audioEncodingStr);
// Add stream
var streamInfo = new AudioStreamInfo(itag, url, container, contentLength, bitrate, audioEncoding);
audioStreamInfoMap[itag] = streamInfo;
}
// If video-only
else
{
// Parse video encoding
var videoEncodingStr = streamInfoParser.ParseVideoEncoding();
var videoEncoding = VideoEncodingHelper.VideoEncodingFromString(videoEncodingStr);
// Parse video quality label and video quality
var videoQualityLabel = streamInfoParser.ParseVideoQualityLabel();
var videoQuality = VideoQualityHelper.VideoQualityFromLabel(videoQualityLabel);
// Parse resolution
var width = streamInfoParser.ParseWidth();
var height = streamInfoParser.ParseHeight();
var resolution = new VideoResolution(width, height);
// Parse framerate
var framerate = streamInfoParser.ParseFramerate();
// Add stream
var streamInfo = new VideoStreamInfo(itag, url, container, contentLength, bitrate, videoEncoding,
videoQualityLabel, videoQuality, resolution, framerate);
videoStreamInfoMap[itag] = streamInfo;
}
}
// Parse dash manifest
var dashManifestUrl = parser.ParseDashManifestUrl();
if (!dashManifestUrl.IsNullOrWhiteSpace())
{
// Get the dash manifest parser
var dashManifestParser = await GetDashManifestParserAsync(dashManifestUrl);
// Parse dash stream infos
foreach (var streamInfoParser in dashManifestParser.GetStreamInfos())
{
// Parse info
var itag = streamInfoParser.ParseItag();
var url = streamInfoParser.ParseUrl();
var contentLength = streamInfoParser.ParseContentLength();
var bitrate = streamInfoParser.ParseBitrate();
// Parse container
var containerStr = streamInfoParser.ParseContainer();
var container = ContainerHelper.ContainerFromString(containerStr);
// If audio-only
if (streamInfoParser.ParseIsAudioOnly())
{
// Parse audio encoding
var audioEncodingStr = streamInfoParser.ParseEncoding();
var audioEncoding = AudioEncodingHelper.AudioEncodingFromString(audioEncodingStr);
// Add stream
var streamInfo =
new AudioStreamInfo(itag, url, container, contentLength, bitrate, audioEncoding);
audioStreamInfoMap[itag] = streamInfo;
}
// If video-only
else
{
// Parse video encoding
var videoEncodingStr = streamInfoParser.ParseEncoding();
var videoEncoding = VideoEncodingHelper.VideoEncodingFromString(videoEncodingStr);
// Parse resolution
var width = streamInfoParser.ParseWidth();
var height = streamInfoParser.ParseHeight();
var resolution = new VideoResolution(width, height);
// Parse framerate
var framerate = streamInfoParser.ParseFramerate();
// Determine video quality from height
var videoQuality = VideoQualityHelper.VideoQualityFromHeight(height);
// Determine video quality label from video quality and framerate
var videoQualityLabel = VideoQualityHelper.VideoQualityToLabel(videoQuality, framerate);
// Add stream
var streamInfo = new VideoStreamInfo(itag, url, container, contentLength, bitrate,
videoEncoding, videoQualityLabel, videoQuality, resolution, framerate);
videoStreamInfoMap[itag] = streamInfo;
}
}
}
// 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();
// Get the HLS manifest URL if available
var hlsManifestUrl = parser.ParseHlsManifestUrl();
// Get expiry date
var expiresIn = parser.ParseStreamInfoSetExpiresIn();
var validUntil = requestedAt.Add(expiresIn);
return(new MediaStreamInfoSet(muxedStreamInfos, audioStreamInfos, videoStreamInfos, hlsManifestUrl,
validUntil));
}