diff --git a/FFMpegCore.Test/AudioTest.cs b/FFMpegCore.Test/AudioTest.cs
index f1abb72..b6fde77 100644
--- a/FFMpegCore.Test/AudioTest.cs
+++ b/FFMpegCore.Test/AudioTest.cs
@@ -8,6 +8,7 @@
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
+using FFMpegCore.Extend;
 
 namespace FFMpegCore.Test
 {
diff --git a/FFMpegCore/Extend/PcmAudioSampleWrapper.cs b/FFMpegCore/Extend/PcmAudioSampleWrapper.cs
index d67038b..503a23f 100644
--- a/FFMpegCore/Extend/PcmAudioSampleWrapper.cs
+++ b/FFMpegCore/Extend/PcmAudioSampleWrapper.cs
@@ -1,27 +1,30 @@
-using FFMpegCore.Pipes;
-using System.IO;
+using System.IO;
 using System.Threading;
 using System.Threading.Tasks;
+using FFMpegCore.Pipes;
 
-public class PcmAudioSampleWrapper : IAudioSample
+namespace FFMpegCore.Extend
 {
-    //This could actually be short or int, but copies would be inefficient.
-    //Handling bytes lets the user decide on the conversion, and abstract the library
-    //from handling shorts, unsigned shorts, integers, unsigned integers and floats.
-    private readonly byte[] _sample;
-
-    public PcmAudioSampleWrapper(byte[] sample)
+    public class PcmAudioSampleWrapper : IAudioSample
     {
-        _sample = sample;
-    }
+        //This could actually be short or int, but copies would be inefficient.
+        //Handling bytes lets the user decide on the conversion, and abstract the library
+        //from handling shorts, unsigned shorts, integers, unsigned integers and floats.
+        private readonly byte[] _sample;
 
-    public void Serialize(Stream stream)
-    {
-        stream.Write(_sample, 0, _sample.Length);
-    }
+        public PcmAudioSampleWrapper(byte[] sample)
+        {
+            _sample = sample;
+        }
 
-    public async Task SerializeAsync(Stream stream, CancellationToken token)
-    {
-        await stream.WriteAsync(_sample, 0, _sample.Length, token);
+        public void Serialize(Stream stream)
+        {
+            stream.Write(_sample, 0, _sample.Length);
+        }
+
+        public async Task SerializeAsync(Stream stream, CancellationToken token)
+        {
+            await stream.WriteAsync(_sample, 0, _sample.Length, token);
+        }
     }
 }