Added transcription of audio and video files to local data sources (#1081)

Co-authored-by: Paul Koudelka <106623909+PaulKoudelka@users.noreply.github.com>

app/MindWork AI Studio/Tools/Services/Indexing/MediaTranscriptionAvailability.cs

@@ -0,0 +1,28 @@
+using AIStudio.Settings;
+
+namespace AIStudio.Tools.Services.Indexing;
+
+/// <summary>
+/// Which transcription provider may hear the audio and video files of a data source.
+/// </summary>
+/// <param name="Provider">The provider, or null when none may.</param>
+/// <param name="IgnoreReason">Why audio and video files without a transcript are left out when no provider may hear them; null when there is a provider.</param>
+internal sealed record MediaTranscriptionAvailability(TranscriptionProvider? Provider, DataSourceEmbeddingIgnoreReason? IgnoreReason)
+{
+    /// <summary>
+    /// No usable transcription provider is configured.
+    /// </summary>
+    public static readonly MediaTranscriptionAvailability MISSING = new(null, DataSourceEmbeddingIgnoreReason.TRANSCRIPTION_PROVIDER_MISSING);
+
+    /// <summary>
+    /// The configured transcription provider falls short of the confidence level of the data source.
+    /// </summary>
+    public static readonly MediaTranscriptionAvailability NOT_ALLOWED = new(null, DataSourceEmbeddingIgnoreReason.TRANSCRIPTION_PROVIDER_NOT_ALLOWED);
+
+    /// <summary>
+    /// The given provider may hear the media files.
+    /// </summary>
+    /// <param name="provider">The provider.</param>
+    /// <returns>The availability.</returns>
+    public static MediaTranscriptionAvailability Allowed(TranscriptionProvider provider) => new(provider, null);
+}