Review usage of string.Substring (part 1)

Reduced allocations by replacing string.Substring with ReadOnlySpan<char>.Slice

1 files changed, 7 insertions, 4 deletions

diff --git a/MediaBrowser.MediaEncoding/Subtitles/SrtParser.cs b/MediaBrowser.MediaEncoding/Subtitles/SrtParser.cs
index 728efa788..cc35efb3f 100644
--- a/MediaBrowser.MediaEncoding/Subtitles/SrtParser.cs
+++ b/MediaBrowser.MediaEncoding/Subtitles/SrtParser.cs
@@ -1,3 +1,5 @@
+#pragma warning disable CS1591
+
 using System;
 using System.Collections.Generic;
 using System.Globalization;
@@ -20,6 +22,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles
             _logger = logger;
         }
 
+        /// <inheritdoc />
         public SubtitleTrackInfo Parse(Stream stream, CancellationToken cancellationToken)
         {
             var trackInfo = new SubtitleTrackInfo();
@@ -55,11 +58,11 @@ namespace MediaBrowser.MediaEncoding.Subtitles
                     }
 
                     subEvent.StartPositionTicks = GetTicks(time[0]);
-                    var endTime = time[1];
-                    var idx = endTime.IndexOf(" ", StringComparison.Ordinal);
+                    var endTime = time[1].AsSpan();
+                    var idx = endTime.IndexOf(' ');
                     if (idx > 0)
                     {
-                        endTime = endTime.Substring(0, idx);
+                        endTime = endTime.Slice(0, idx);
                     }
 
                     subEvent.EndPositionTicks = GetTicks(endTime);
@@ -88,7 +91,7 @@ namespace MediaBrowser.MediaEncoding.Subtitles
             return trackInfo;
         }
 
-        long GetTicks(string time)
+        private long GetTicks(ReadOnlySpan<char> time)
         {
             return TimeSpan.TryParseExact(time, @"hh\:mm\:ss\.fff", _usCulture, out var span)
                 ? span.Ticks