Baseline: WPF/Avalonia/Cli/Core + plans (BROWSER_FEATURES_PLAN v2, MOBILE_PLAN v1)

VideoDownloader.Core/Hls/M3u8Parser.cs

@@ -0,0 +1,101 @@
+using System.Text.RegularExpressions;
+using VideoDownloader.Core.Models;
+
+namespace VideoDownloader.Core.Hls;
+
+/// <summary>m3u8(마스터/미디어) 재생목록 파서. Python parse_m3u8 의 C# 포팅.</summary>
+public static class M3u8Parser
+{
+    // KEY="VAL",KEY2=VAL  형태 속성 파싱
+    private static readonly Regex AttrRe =
+        new(@"(?<k>[A-Z0-9\-]+)=(\""(?<q>[^""]*)\"")|(?<k2>[A-Z0-9\-]+)=(?<v>[^,]*)",
+            RegexOptions.Compiled);
+
+    private static Dictionary<string, string> ParseAttrs(string s)
+    {
+        var d = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
+        foreach (Match m in AttrRe.Matches(s))
+        {
+            var key = m.Groups["k"].Success ? m.Groups["k"].Value : m.Groups["k2"].Value;
+            var val = m.Groups["q"].Success ? m.Groups["q"].Value : m.Groups["v"].Value;
+            d[key] = val;
+        }
+        return d;
+    }
+
+    private static string GetValue(this Dictionary<string, string> d, string key, string def = "") =>
+        d.TryGetValue(key, out var v) ? v : def;
+
+    public static ParsedPlaylist Parse(string text, Uri baseUrl)
+    {
+        var variants = new List<Variant>();
+        var segments = new List<Segment>();
+        Uri? init = null;
+        bool isMaster = false;
+
+        Dictionary<string, string>? pendingVariant = null;
+        KeyInfo? curKey = null;
+        long seq = 0;
+        int idx = 0;
+
+        foreach (var raw in text.Split('\n'))
+        {
+            var line = raw.Trim();
+            if (string.IsNullOrEmpty(line)) continue;
+
+            if (line.StartsWith("#EXT-X-STREAM-INF:"))
+            {
+                pendingVariant = ParseAttrs(line.Substring("#EXT-X-STREAM-INF:".Length));
+                continue;
+            }
+            if (line.StartsWith("#EXT-X-MEDIA-SEQUENCE:"))
+            {
+                if (long.TryParse(line.Split(':', 2)[1].Trim(), out var s)) seq = s;
+                continue;
+            }
+            if (line.StartsWith("#EXT-X-KEY:"))
+            {
+                var a = ParseAttrs(line.Substring("#EXT-X-KEY:".Length));
+                var method = a.GetValue("METHOD", "NONE").ToUpperInvariant();
+                curKey = method == "AES-128"
+                    ? new KeyInfo(
+                        a.TryGetValue("URI", out var u) && !string.IsNullOrEmpty(u) ? new Uri(baseUrl, u) : null,
+                        a.GetValue("IV"))
+                    : null;
+                continue;
+            }
+            if (line.StartsWith("#EXT-X-MAP:"))
+            {
+                var a = ParseAttrs(line.Substring("#EXT-X-MAP:".Length));
+                if (a.TryGetValue("URI", out var u) && !string.IsNullOrEmpty(u))
+                    init = new Uri(baseUrl, u);
+                continue;
+            }
+            if (line.StartsWith("#")) continue;
+
+            // URL 라인
+            var abs = new Uri(baseUrl, line);
+            if (pendingVariant != null)
+            {
+                int.TryParse(pendingVariant.GetValue("BANDWIDTH", "0"), out var bw);
+                variants.Add(new Variant(abs, bw,
+                    pendingVariant.GetValue("RESOLUTION"), pendingVariant.GetValue("CODECS")));
+                pendingVariant = null;
+                isMaster = true;
+            }
+            else
+            {
+                segments.Add(new Segment(abs, idx, seq, curKey));
+                idx++; seq++;
+            }
+        }
+
+        return new ParsedPlaylist
+        {
+            Type = isMaster ? PlaylistType.Master : PlaylistType.Media,
+            Variants = variants,
+            Segments = segments,
+            InitSegment = init,
+        };
+    }
+}