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

VideoDownloader.Core/Models/PlaylistModels.cs

@@ -0,0 +1,21 @@
+namespace VideoDownloader.Core.Models;
+
+public enum PlaylistType { Master, Media }
+
+/// <summary>마스터 재생목록의 변환(화질) 항목</summary>
+public record Variant(Uri Url, int Bandwidth, string Resolution, string Codecs);
+
+/// <summary>HLS AES-128 키 정보 (EXT-X-KEY)</summary>
+public record KeyInfo(Uri? KeyUri, string? Iv);
+
+/// <summary>미디어 세그먼트</summary>
+public record Segment(Uri Url, int Index, long Sequence, KeyInfo? Key);
+
+/// <summary>m3u8 파싱 결과</summary>
+public record ParsedPlaylist
+{
+    public PlaylistType Type { get; init; }
+    public IReadOnlyList<Variant> Variants { get; init; } = Array.Empty<Variant>();
+    public IReadOnlyList<Segment> Segments { get; init; } = Array.Empty<Segment>();
+    public Uri? InitSegment { get; init; } // #EXT-X-MAP (fMP4 초기화 세그먼트)
+}