优化直播录制：单次请求刷新所有轨道

src/N_m3u8DL-RE/DownloadManager/SimpleLiveRecordManager2.cs

@@ -13,6 +13,7 @@ using N_m3u8DL_RE.Util;
 using Spectre.Console;
 using System.Collections.Concurrent;
 using System.Text;
+using System.Threading.Tasks;
 using System.Threading.Tasks.Dataflow;
 using System.Xml.Linq;
 
@@ -30,6 +31,7 @@ namespace N_m3u8DL_RE.DownloadManager
         bool STOP_FLAG = false;
         int WAIT_SEC = 0; //刷新间隔
         ConcurrentDictionary<int, int> RecordingDurDic = new(); //已录制时长
+        ConcurrentDictionary<int, BufferBlock<List<MediaSegment>>> BlockDic = new(); //各流的Block
         ConcurrentDictionary<string, string> LastFileNameDic = new(); //上次下载的文件名
         ConcurrentDictionary<string, long> DateTimeDic = new(); //上次下载的dateTime
         CancellationTokenSource CancellationTokenSource = new(); //取消Wait
@@ -171,7 +173,6 @@ namespace N_m3u8DL_RE.DownloadManager
             FileStream? fileOutputStream = null;
             WebVttSub currentVtt = new(); //字幕流始终维护一个实例
             bool firstSub = true;
-            task.MaxValue = 0;
             task.StartTask();
 
             var name = streamSpec.ToShortString();
@@ -426,6 +427,14 @@ namespace N_m3u8DL_RE.DownloadManager
                     }
                 }
 
+                /*//写出m3u8
+                if (DownloaderConfig.MyOptions.LiveWriteHLS)
+                {
+                    var _saveDir = DownloaderConfig.MyOptions.SaveDir ?? Environment.CurrentDirectory;
+                    var _saveName = DownloaderConfig.MyOptions.SaveName ?? DateTime.Now.ToString("yyyyMMddHHmmss");
+                    await StreamingUtil.WriteStreamListAsync(FileDic, task.Id, 0, _saveName, _saveDir);
+                }*/
+
                 //合并逻辑
                 if (DownloaderConfig.MyOptions.LiveRealTimeMerge)
                 {
@@ -550,33 +559,42 @@ namespace N_m3u8DL_RE.DownloadManager
             return true;
         }
 
-        private async Task PlayListProduceAsync(StreamSpec streamSpec, ProgressTask task, BufferBlock<List<MediaSegment>> target)
+        private async Task PlayListProduceAsync(Dictionary<StreamSpec, ProgressTask> dic)
         {
             while (!STOP_FLAG)
             {
                 if (WAIT_SEC != 0)
                 {
+                    //1. MPD 所有URL相同 单次请求即可获得所有轨道的信息
+                    //2. M3U8 所有URL不同 才需要多次请求
+
+                    await Parallel.ForEachAsync(dic, async (dic, _) =>
+                    {
+                        var streamSpec = dic.Key;
+                        var task = dic.Value;
                         var allHasDatetime = streamSpec.Playlist!.MediaParts[0].MediaSegments.All(s => s.DateTime != null);
                         //过滤不需要下载的片段
                         FilterMediaSegments(streamSpec, allHasDatetime);
                         var newList = streamSpec.Playlist!.MediaParts[0].MediaSegments;
                         if (newList.Count > 0)
                         {
+                            task.MaxValue += newList.Count;
                             //推送给消费者
-                        await target.SendAsync(newList);
+                            await BlockDic[task.Id].SendAsync(newList);
                             //更新最新链接
                             LastFileNameDic[streamSpec.ToShortString()] = GetSegmentName(newList.Last(), allHasDatetime);
                             //尝试更新时间戳
                             var dt = newList.Last().DateTime;
                             DateTimeDic[streamSpec.ToShortString()] = dt != null ? GetUnixTimestamp(dt.Value) : 0L;
-                        task.MaxValue += newList.Count;
                         }
+                    });
+
                     try
                     {
                         //Logger.WarnMarkUp($"wait {waitSec}s");
                         if (!STOP_FLAG) await Task.Delay(WAIT_SEC * 1000, CancellationTokenSource.Token);
                         //刷新列表
-                        if (!STOP_FLAG) await StreamExtractor.RefreshPlayListAsync(new List<StreamSpec>() { streamSpec });
+                        if (!STOP_FLAG) await StreamExtractor.RefreshPlayListAsync(dic.Keys.ToList());
                     }
                     catch (OperationCanceledException oce) when (oce.CancellationToken == CancellationTokenSource.Token)
                     {
@@ -585,8 +603,11 @@ namespace N_m3u8DL_RE.DownloadManager
                 }
             }
 
+            foreach (var target in BlockDic.Values)
+            {
                 target.Complete();
             }
+        }
 
         private void FilterMediaSegments(StreamSpec streamSpec, bool allHasDatetime)
         {
@@ -643,6 +664,14 @@ namespace N_m3u8DL_RE.DownloadManager
                 Logger.WarnMarkUp($"set refresh interval to {WAIT_SEC} seconds");
             }
 
+            /*//写出master
+            if (DownloaderConfig.MyOptions.LiveWriteHLS)
+            {
+                var saveDir = DownloaderConfig.MyOptions.SaveDir ?? Environment.CurrentDirectory;
+                var saveName = DownloaderConfig.MyOptions.SaveName ?? DateTime.Now.ToString("yyyyMMddHHmmss");
+                await StreamingUtil.WriteMasterListAsync(SelectedSteams, saveName, saveDir);
+            }*/
+
             var progress = AnsiConsole.Progress().AutoClear(true);
 
             //进度条的列定义
@@ -661,9 +690,10 @@ namespace N_m3u8DL_RE.DownloadManager
                 //创建任务
                 var dic = SelectedSteams.Select(item =>
                 {
-                    var task = ctx.AddTask(item.ToShortString(), autoStart: false);
+                    var task = ctx.AddTask(item.ToShortString(), autoStart: false, maxValue: 0);
                     SpeedContainerDic[task.Id] = new SpeedContainer(); //速度计算
                     RecordingDurDic[task.Id] = 0;
+                    BlockDic[task.Id] = new BufferBlock<List<MediaSegment>>();
                     return (item, task);
                 }).ToDictionary(item => item.item, item => item.task);
 
@@ -681,13 +711,13 @@ namespace N_m3u8DL_RE.DownloadManager
                 {
                     MaxDegreeOfParallelism = SelectedSteams.Count
                 };
+                //开始刷新
+                var producerTask = PlayListProduceAsync(dic);
                 //并发下载
                 await Parallel.ForEachAsync(dic, options, async (kp, _) =>
                 {
                     var task = kp.Value;
-                    var list = new BufferBlock<List<MediaSegment>>();
+                    var consumerTask = RecordStreamAsync(kp.Key, task, SpeedContainerDic[task.Id], BlockDic[task.Id]);
-                    var consumerTask = RecordStreamAsync(kp.Key, task, SpeedContainerDic[task.Id], list);
-                    await PlayListProduceAsync(kp.Key, task, list);
                     Results[kp.Key] = await consumerTask;
                 });
             });