Use TV guide for livestreams

Jellyfin.Plugin.SRFPlay/Utilities/MimeTypeHelper.cs

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+using System;
+
+namespace Jellyfin.Plugin.SRFPlay.Utilities;
+
+/// <summary>
+/// Helper class for determining MIME content types.
+/// </summary>
+public static class MimeTypeHelper
+{
+    /// <summary>
+    /// Gets the MIME content type for an image based on URL or file extension.
+    /// </summary>
+    /// <param name="url">The image URL.</param>
+    /// <returns>The MIME content type, defaulting to "image/jpeg" for SRF images.</returns>
+    public static string GetImageContentType(string? url)
+    {
+        if (string.IsNullOrEmpty(url))
+        {
+            return "image/jpeg";
+        }
+
+        var uri = new Uri(url);
+        var path = uri.AbsolutePath.ToLowerInvariant();
+
+        if (path.EndsWith(".png", StringComparison.Ordinal))
+        {
+            return "image/png";
+        }
+
+        if (path.EndsWith(".gif", StringComparison.Ordinal))
+        {
+            return "image/gif";
+        }
+
+        if (path.EndsWith(".webp", StringComparison.Ordinal))
+        {
+            return "image/webp";
+        }
+
+        if (path.EndsWith(".jpg", StringComparison.Ordinal) || path.EndsWith(".jpeg", StringComparison.Ordinal))
+        {
+            return "image/jpeg";
+        }
+
+        // Default to JPEG for SRF images (most common)
+        return "image/jpeg";
+    }
+
+    /// <summary>
+    /// Gets the MIME content type for a media segment based on file extension.
+    /// </summary>
+    /// <param name="path">The segment path or filename.</param>
+    /// <returns>The MIME content type.</returns>
+    public static string GetSegmentContentType(string path)
+    {
+        if (path.EndsWith(".ts", StringComparison.OrdinalIgnoreCase))
+        {
+            return "video/MP2T";
+        }
+
+        if (path.EndsWith(".mp4", StringComparison.OrdinalIgnoreCase) ||
+            path.EndsWith(".m4s", StringComparison.OrdinalIgnoreCase))
+        {
+            return "video/mp4";
+        }
+
+        if (path.EndsWith(".aac", StringComparison.OrdinalIgnoreCase))
+        {
+            return "audio/aac";
+        }
+
+        return "application/octet-stream";
+    }
+}