feat: C# Fur Elise player using Windows Beep API

2026-09-21 10:58:32 +08:00
commit 7ece384453
5 changed files with 221 additions and 0 deletions
@@ -0,0 +1,132 @@
+// Für Elise (致爱丽丝) — C# console player
+// Windows: kernel32 Beep; --dry-run prints score only.
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using System.Threading;
+
+class FurElisePlayer
+{
+    [DllImport("kernel32.dll", SetLastError = true)]
+    static extern bool Beep(uint dwFreq, uint dwDuration);
+
+    static readonly Dictionary<string, int> Freq = new(StringComparer.OrdinalIgnoreCase)
+    {
+        ["C4"] = 262, ["D4"] = 294, ["Ds4"] = 311, ["E4"] = 330,
+        ["F4"] = 349, ["G4"] = 392, ["Gs4"] = 415, ["A4"] = 440,
+        ["As4"] = 466, ["B4"] = 494,
+        ["C5"] = 523, ["D5"] = 587, ["Ds5"] = 622, ["E5"] = 659,
+        ["F5"] = 698, ["G5"] = 784, ["Gs5"] = 831, ["A5"] = 880,
+        ["B5"] = 988, ["C6"] = 1047,
+        ["A3"] = 220, ["B3"] = 247, ["E3"] = 165,
+    };
+
+    // note name, duration in 16th-note units (4 = quarter), rest = "R"
+    static readonly (string Note, int Units)[] Score =
+    {
+        // Theme A (famous opening)
+        ("E5", 2), ("Ds5", 2), ("E5", 2), ("Ds5", 2), ("E5", 2),
+        ("B4", 2), ("D5", 2), ("C5", 2),
+        ("A4", 6), ("R", 2),
+        ("C4", 2), ("E4", 2), ("A4", 2),
+        ("B4", 6), ("R", 2),
+        ("E4", 2), ("Gs4", 2), ("B4", 2),
+        ("C5", 6), ("R", 2),
+
+        ("E4", 2), ("E5", 2), ("Ds5", 2), ("E5", 2), ("Ds5", 2), ("E5", 2),
+        ("B4", 2), ("D5", 2), ("C5", 2),
+        ("A4", 6), ("R", 2),
+        ("C4", 2), ("E4", 2), ("A4", 2),
+        ("B4", 6), ("R", 2),
+        ("E4", 2), ("C5", 2), ("B4", 2),
+        ("A4", 12),
+
+        // Theme B (middle section, simplified)
+        ("E4", 2), ("C5", 2), ("B4", 2),
+        ("A4", 4), ("E4", 2), ("F4", 2),
+        ("E4", 2), ("A4", 2), ("B4", 2), ("C5", 2),
+        ("B4", 4), ("E4", 2), ("Gs4", 2),
+        ("A4", 4), ("E4", 2), ("B4", 2),
+        ("C5", 2), ("A4", 2), ("B4", 2), ("A4", 2),
+        ("E5", 2), ("Ds5", 2), ("E5", 2), ("Ds5", 2), ("E5", 2),
+        ("B4", 2), ("D5", 2), ("C5", 2),
+        ("A4", 6), ("R", 2),
+        ("C4", 2), ("E4", 2), ("A4", 2),
+        ("B4", 6), ("R", 2),
+        ("E4", 2), ("Gs4", 2), ("B4", 2),
+        ("C5", 6), ("R", 2),
+        ("E4", 2), ("E5", 2), ("Ds5", 2), ("E5", 2), ("Ds5", 2), ("E5", 2),
+        ("B4", 2), ("D5", 2), ("C5", 2),
+        ("A4", 6), ("R", 2),
+        ("C4", 2), ("E4", 2), ("A4", 2),
+        ("B4", 6), ("R", 2),
+        ("E4", 2), ("C5", 2), ("B4", 2),
+        ("A4", 12),
+    };
+
+    static int Main(string[] args)
+    {
+        var dryRun = false;
+        var bpm = 72; // Für Elise ~ 72 eighth-ish feel; we treat unit = 16th
+        var loops = 1;
+
+        for (var i = 0; i < args.Length; i++)
+        {
+            var a = args[i];
+            if (a == "--dry-run") dryRun = true;
+            else if (a == "--bpm" && i + 1 < args.Length) bpm = int.Parse(args[++i]);
+            else if (a == "--loops" && i + 1 < args.Length) loops = int.Parse(args[++i]);
+            else if (a == "--help" || a == "-h")
+            {
+                Console.WriteLine("FurElisePlayer [--dry-run] [--bpm 72] [--loops 1]");
+                Console.WriteLine("Play Beethoven - Für Elise via Windows Beep.");
+                return 0;
+            }
+        }
+
+        if (bpm < 40) bpm = 40;
+        if (bpm > 200) bpm = 200;
+        if (loops < 1) loops = 1;
+
+        // 16th-note duration in ms from BPM (quarter note = 60000/bpm)
+        var unitMs = (int)Math.Round(60000.0 / bpm / 4.0);
+        if (unitMs < 20) unitMs = 20;
+
+        Console.WriteLine("Beethoven - Für Elise (致爱丽丝)");
+        Console.WriteLine($"BPM={bpm}, unit={unitMs}ms, notes={Score.Length}, loops={loops}");
+        Console.WriteLine(dryRun ? "Mode: dry-run (no sound)" : "Mode: play");
+        Console.WriteLine(new string('-', 48));
+
+        for (var loop = 1; loop <= loops; loop++)
+        {
+            if (loops > 1) Console.WriteLine($"--- loop {loop}/{loops} ---");
+            foreach (var (note, units) in Score)
+            {
+                var ms = units * unitMs;
+                // slight articulation: leave a tiny gap
+                var soundMs = Math.Max(15, ms - 8);
+
+                if (note == "R" || note == "-" || note.Length == 0)
+                {
+                    if (dryRun) Console.WriteLine($"  REST  {ms,4} ms");
+                    else Thread.Sleep(ms);
+                    continue;
+                }
+
+                if (!Freq.TryGetValue(note, out var hz))
+                {
+                    Console.Error.WriteLine($"Unknown note: {note}");
+                    continue;
+                }
+
+                if (dryRun)
+                    Console.WriteLine($"  {note,-5} {hz,4} Hz  {ms,4} ms");
+                else if (!Beep((uint)hz, (uint)soundMs))
+                    Console.Beep(hz, soundMs);
+            }
+        }
+
+        Console.WriteLine("Done.");
+        return 0;
+    }
+}