support static trailer streaming

MediaBrowser.Api/Playback/StaticRemoteStreamWriter.cs

@@ -0,0 +1,75 @@
+using ServiceStack.Service;
+using ServiceStack.ServiceHost;
+using System.Collections.Generic;
+using System.IO;
+using System.Net.Http;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Api.Playback
+{
+    /// <summary>
+    /// Class StaticRemoteStreamWriter
+    /// </summary>
+    public class StaticRemoteStreamWriter : IStreamWriter, IHasOptions
+    {
+        /// <summary>
+        /// The _input stream
+        /// </summary>
+        private readonly HttpResponseMessage _msg;
+
+        private readonly HttpClient _client;
+
+        /// <summary>
+        /// The _options
+        /// </summary>
+        private readonly IDictionary<string, string> _options = new Dictionary<string, string>();
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="StaticRemoteStreamWriter"/> class.
+        /// </summary>
+        public StaticRemoteStreamWriter(HttpResponseMessage msg, HttpClient client)
+        {
+            _msg = msg;
+            _client = client;
+        }
+
+        /// <summary>
+        /// Gets the options.
+        /// </summary>
+        /// <value>The options.</value>
+        public IDictionary<string, string> Options
+        {
+            get { return _options; }
+        }
+
+        /// <summary>
+        /// Writes to.
+        /// </summary>
+        /// <param name="responseStream">The response stream.</param>
+        public void WriteTo(Stream responseStream)
+        {
+            var task = WriteToAsync(responseStream);
+
+            Task.WaitAll(task);
+        }
+
+        /// <summary>
+        /// Writes to async.
+        /// </summary>
+        /// <param name="responseStream">The response stream.</param>
+        /// <returns>Task.</returns>
+        public async Task WriteToAsync(Stream responseStream)
+        {
+            using (_client)
+            {
+                using (_msg)
+                {
+                    using (var input = await _msg.Content.ReadAsStreamAsync().ConfigureAwait(false))
+                    {
+                        await input.CopyToAsync(responseStream).ConfigureAwait(false);
+                    }
+                }
+            }
+        }
+    }
+}