add VTT writer implementation

MediaBrowser.MediaEncoding/Subtitles/VttWriter.cs

@@ -9,8 +9,18 @@ namespace MediaBrowser.MediaEncoding.Subtitles
 {
     public class VttWriter : ISubtitleWriter
     {
-        public void Write(SubtitleTrackInfo info, Stream stream)
-        {
+        public void Write(SubtitleTrackInfo info, Stream stream) {
+            using (var writer = new StreamWriter(stream))
+            {
+                writer.WriteLine("WEBVTT");
+                writer.WriteLine(string.Empty);
+                foreach (var trackEvent in info.TrackEvents)
+                {
+                    writer.WriteLine(@"{0:hh\:mm\:ss\.fff} --> {1:hh\:mm\:ss\.fff}", TimeSpan.FromTicks(trackEvent.StartPositionTicks), TimeSpan.FromTicks(trackEvent.EndPositionTicks));
+                    writer.WriteLine(trackEvent.Text);
+                    writer.WriteLine(string.Empty);
+                }
+            }
         }
     }
 }

MediaBrowser.Tests/MediaBrowser.Tests.csproj

@@ -52,6 +52,7 @@
   <ItemGroup>
     <Compile Include="MediaEncoding\Subtitles\SsaParserTests.cs" />
     <Compile Include="MediaEncoding\Subtitles\SrtParserTests.cs" />
+    <Compile Include="MediaEncoding\Subtitles\VttWriterTest.cs" />
     <Compile Include="Providers\MovieDbProviderTests.cs" />
     <Compile Include="Resolvers\MovieResolverTests.cs" />
     <Compile Include="Resolvers\TvUtilTests.cs" />
@@ -84,6 +85,9 @@
     <None Include="app.config" />
   </ItemGroup>
   <ItemGroup>
+    <None Include="MediaEncoding\Subtitles\TestSubtitles\expected.vtt">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
     <None Include="MediaEncoding\Subtitles\TestSubtitles\data.ssa">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>

MediaBrowser.Tests/MediaEncoding/Subtitles/TestSubtitles/expected.vtt

@@ -0,0 +1,32 @@
+WEBVTT
+
+00:00:02.400 --> 00:00:05.200
+[Background Music Playing]
+
+00:00:15.712 --> 00:00:17.399
+Oh my god, Watch out!<br />It's coming!!
+
+00:00:25.712 --> 00:00:30.399
+[Bird noises]
+
+00:00:31.000 --> 00:00:31.999
+This text is <font color="red">RED</font> and has not been positioned.
+
+00:00:32.000 --> 00:00:32.999
+This is a<br />new line, as is<br />this
+
+00:00:33.000 --> 00:00:33.999
+This contains nested <b>bold, <i>italic, <u>underline</u> and <s>strike-through</s></u></i></b> HTML tags
+
+00:00:34.000 --> 00:00:34.999
+Unclosed but <b>supported HTML tags are left in,  SSA italics aren't
+
+00:00:35.000 --> 00:00:35.999
+&lt;ggg&gt;Unsupported&lt;/ggg&gt; HTML tags are escaped and left in, even if &lt;hhh&gt;not closed.
+
+00:00:36.000 --> 00:00:36.999
+Multiple SSA tags are stripped
+
+00:00:37.000 --> 00:00:37.999
+Greater than (&lt;) and less than (&gt;) are shown
+

MediaBrowser.Tests/MediaEncoding/Subtitles/VttWriterTest.cs

@@ -0,0 +1,103 @@
+using System.Collections.Generic;
+using System.IO;
+using MediaBrowser.MediaEncoding.Subtitles;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace MediaBrowser.Tests.MediaEncoding.Subtitles {
+
+    [TestClass]
+    public class VttWriterTest {
+        [TestMethod]
+        public void TestWrite() {
+            var infoSubs =
+                new SubtitleTrackInfo
+                {
+                    TrackEvents = new List<SubtitleTrackEvent> {
+                                                                                         new SubtitleTrackEvent {
+                                                                                                                    Id = "1",
+                                                                                                                    StartPositionTicks = 24000000,
+                                                                                                                    EndPositionTicks = 52000000,
+                                                                                                                    Text =
+                                                                                                                        "[Background Music Playing]"
+                                                                                                                },
+                                                                                         new SubtitleTrackEvent {
+                                                                                                                    Id = "2",
+                                                                                                                    StartPositionTicks = 157120000,
+                                                                                                                    EndPositionTicks = 173990000,
+                                                                                                                    Text =
+                                                                                                                        "Oh my god, Watch out!<br />It's coming!!"
+                                                                                                                },
+                                                                                         new SubtitleTrackEvent {
+                                                                                                                    Id = "3",
+                                                                                                                    StartPositionTicks = 257120000,
+                                                                                                                    EndPositionTicks = 303990000,
+                                                                                                                    Text = "[Bird noises]"
+                                                                                                                },
+                                                                                         new SubtitleTrackEvent {
+                                                                                                                    Id = "4",
+                                                                                                                    StartPositionTicks = 310000000,
+                                                                                                                    EndPositionTicks = 319990000,
+                                                                                                                    Text =
+                                                                                                                        "This text is <font color=\"red\">RED</font> and has not been positioned."
+                                                                                                                },
+                                                                                         new SubtitleTrackEvent {
+                                                                                                                    Id = "5",
+                                                                                                                    StartPositionTicks = 320000000,
+                                                                                                                    EndPositionTicks = 329990000,
+                                                                                                                    Text =
+                                                                                                                        "This is a<br />new line, as is<br />this"
+                                                                                                                },
+                                                                                         new SubtitleTrackEvent {
+                                                                                                                    Id = "6",
+                                                                                                                    StartPositionTicks = 330000000,
+                                                                                                                    EndPositionTicks = 339990000,
+                                                                                                                    Text =
+                                                                                                                        "This contains nested <b>bold, <i>italic, <u>underline</u> and <s>strike-through</s></u></i></b> HTML tags"
+                                                                                                                },
+                                                                                         new SubtitleTrackEvent {
+                                                                                                                    Id = "7",
+                                                                                                                    StartPositionTicks = 340000000,
+                                                                                                                    EndPositionTicks = 349990000,
+                                                                                                                    Text =
+                                                                                                                        "Unclosed but <b>supported HTML tags are left in,  SSA italics aren't"
+                                                                                                                },
+                                                                                         new SubtitleTrackEvent {
+                                                                                                                    Id = "8",
+                                                                                                                    StartPositionTicks = 350000000,
+                                                                                                                    EndPositionTicks = 359990000,
+                                                                                                                    Text =
+                                                                                                                        "&lt;ggg&gt;Unsupported&lt;/ggg&gt; HTML tags are escaped and left in, even if &lt;hhh&gt;not closed."
+                                                                                                                },
+                                                                                         new SubtitleTrackEvent {
+                                                                                                                    Id = "9",
+                                                                                                                    StartPositionTicks = 360000000,
+                                                                                                                    EndPositionTicks = 369990000,
+                                                                                                                    Text =
+                                                                                                                        "Multiple SSA tags are stripped"
+                                                                                                                },
+                                                                                         new SubtitleTrackEvent {
+                                                                                                                    Id = "10",
+                                                                                                                    StartPositionTicks = 370000000,
+                                                                                                                    EndPositionTicks = 379990000,
+                                                                                                                    Text =
+                                                                                                                        "Greater than (&lt;) and less than (&gt;) are shown"
+                                                                                                                }
+                                                                                     }
+                };
+
+            var sut = new VttWriter();
+
+            if(File.Exists("testVTT.vtt"))
+                File.Delete("testVTT.vtt");
+            using (var file = File.OpenWrite("testVTT.vtt"))
+            {
+                sut.Write(infoSubs,file);
+            }
+
+            var result = File.ReadAllText("testVTT.vtt");
+            var expectedText = File.ReadAllText(@"MediaEncoding\Subtitles\TestSubtitles\expected.vtt");
+            
+            Assert.AreEqual(expectedText, result);
+        }
+    }
+}