优化单分段的速度计算及进度显示

src/N_m3u8DL-RE/Column/DownloadSpeedColumn.cs

@@ -27,6 +27,13 @@ namespace N_m3u8DL_RE.Column
         public override IRenderable Render(RenderContext context, ProgressTask task, TimeSpan deltaTime)
         {
             var now = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
+            var flag = task.IsFinished || !task.IsStarted;
+            //单文件下载汇报进度
+            if (!flag && SpeedContainer.SingleSegment && SpeedContainer.ResponseLength != null)
+            {
+                task.MaxValue = (double)SpeedContainer.ResponseLength;
+                task.Value = SpeedContainer.RDownloaded;
+            }
             //一秒汇报一次即可
             if (DateTimeString != now)
             {
@@ -34,7 +41,6 @@ namespace N_m3u8DL_RE.Column
                 SpeedContainer.Reset();
                 DateTimeString = now;
             }
-            var flag = task.IsFinished || !task.IsStarted;
             var style = flag ? Style.Plain : MyStyle;
             return flag ? new Text("-", style).Centered() : new Text(Speed, style).Centered();
         }

src/N_m3u8DL-RE/DownloadManager/SimpleDownloadManager.cs

@@ -112,11 +112,13 @@ namespace N_m3u8DL_RE.DownloadManager
 
         private async Task<bool> DownloadStreamAsync(StreamSpec streamSpec, ProgressTask task, SpeedContainer speedContainer)
         {
+            speedContainer.ResetVars();
             bool useAACFilter = false; //ffmpeg合并flag
             ConcurrentDictionary<MediaSegment, DownloadResult?> FileDic = new();
 
             var segments = streamSpec.Playlist?.MediaParts.SelectMany(m => m.MediaSegments);
             if (segments == null) return false;
+            if (segments.Count() == 1) speedContainer.SingleSegment = true;
 
             var type = streamSpec.MediaType ?? Common.Enum.MediaType.VIDEO;
             var dirName = $"{DownloaderConfig.SaveName ?? NowDateTime.ToString("yyyy-MM-dd_HH-mm-ss")}_{streamSpec.GroupId}_{streamSpec.Codecs}_{streamSpec.Bandwidth}_{streamSpec.Language}";

src/N_m3u8DL-RE/Entity/SpeedContainer.cs

@@ -11,11 +11,18 @@ namespace N_m3u8DL_RE.Entity
 {
     internal class SpeedContainer
     {
+        public bool SingleSegment { get; set; } = false;
+        public long? ResponseLength { get; set; }
+        public long RDownloaded { get; set; } = 0L;
+
+        ///////////////////////////////////////////////////
+
         private long _downloaded = 0;
         public long Downloaded { get => _downloaded; }
 
         public long Add(long size)
         {
+            if (SingleSegment) RDownloaded += size;
             return Interlocked.Add(ref _downloaded, size);
         }
 
@@ -23,5 +30,13 @@ namespace N_m3u8DL_RE.Entity
         {
             Interlocked.Exchange(ref _downloaded, 0);
         }
+
+        public void ResetVars()
+        {
+            Reset();
+            SingleSegment = false;
+            ResponseLength = null;
+            RDownloaded = 0L;
+        }
     }
 }

src/N_m3u8DL-RE/Util/DownloadUtil.cs

@@ -51,6 +51,8 @@ namespace N_m3u8DL_RE.Util
             }
             response.EnsureSuccessStatusCode();
             var contentLength = response.Content.Headers.ContentLength;
+            if (speedContainer.SingleSegment) speedContainer.ResponseLength = contentLength;
+
             using var stream = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.None);
             using var responseStream = await response.Content.ReadAsStreamAsync();
             var buffer = new byte[16 * 1024];