/// <summary>
/// Selects a format from the list of available formats based on the given format specifier (single).
/// Ported from _build_selector_function() in youtube_dl/YoutubeDL.py:
/// https://github.com/ytdl-org/youtube-dl/blob/9c1e164e0cd77331ea4f0b474b32fd06f84bad71/youtube_dl/YoutubeDL.py#L1262-L1316.
/// </summary>
/// <returns>The selected format or null if not found.</returns>
public static FormatData SelectSingleFormat(this VideoData videoData, string formatSpecifier)
{
if (new[] { "best", "worst", null }.Contains(formatSpecifier))
{
var audioVideoFormats = videoData.GetAudioVideoFormats().ToList();
if (audioVideoFormats.Count > 0)
{
int index = formatSpecifier == "worst" ? 0 : (audioVideoFormats.Count - 1);
return(audioVideoFormats[index]);
}
// select best video-only or audio-only format
else
{
int index = formatSpecifier == "worst" ? 0 : (videoData.Formats.Length - 1);
return(videoData.Formats[index]);
}
}
else if (formatSpecifier == "bestaudio")
{
var audioFormats = videoData.GetAudioOnlyFormats().ToList();
if (audioFormats.Count > 0)
{
return(audioFormats[audioFormats.Count - 1]);
}
else
{
return(null);
}
}
else if (formatSpecifier == "worstaudio")
{
var audioFormats = videoData.GetAudioOnlyFormats().ToList();
if (audioFormats.Count > 0)
{
return(audioFormats[0]);
}
else
{
return(null);
}
}
else if (formatSpecifier == "bestvideo")
{
var audioFormats = videoData.GetVideoOnlyFormats().ToList();
if (audioFormats.Count > 0)
{
return(audioFormats[audioFormats.Count - 1]);
}
else
{
return(null);
}
}
else if (formatSpecifier == "worstvideo")
{
var audioFormats = videoData.GetVideoOnlyFormats().ToList();
if (audioFormats.Count > 0)
{
return(audioFormats[0]);
}
else
{
return(null);
}
}
else
{
string[] extensions = new[] { "mp4", "flv", "webm", "3gp", "m4a", "mp3", "ogg", "aac", "wav" };
if (extensions.Contains(formatSpecifier))
{
var matches = videoData.Formats.Where(f => f.Extension == formatSpecifier);
return(matches.LastOrDefault());
}
else
{
var matches = videoData.Formats.Where(f => f.FormatId == formatSpecifier);
return(matches.LastOrDefault());
}
}
}