Sdl backend (#670)

* [audio] added sdl audio backend and in-tree atrac9 decoder * [input] replaced per-platform pad readers with sdl gamepad input * [video] added sdl window and host display plumbing * [gui] added host display options and per-game render settings * [bink] synced host movie playback to the guest audio clock * [cpu] hooked windows write faults into guest image tracking * [perf] added guest and render profiling, reserved host cpu lanes * [kernel] fixed stale pthread mutex handle alias * [host] wired the sdl session, save-data paths and project references * [audio] hoisted ajm trace stackalloc out of its loop * [video] Add guest image sync setting * [build] Strip native symbols * reuse
2026-07-31 06:59:45 +08:00 · 2026-07-28 03:33:26 +03:00
parent b4cc5f88ca
commit 2b6bd5a532
111 changed files with 9846 additions and 4479 deletions
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: MIT
+#nullable disable
+using System;
+using LibAtrac9.Utilities;
+
+namespace LibAtrac9
+{
+    internal class HuffmanCodebook
+    {
+        public HuffmanCodebook(short[] codes, byte[] bits, byte valueCountPower)
+        {
+            Codes = codes;
+            Bits = bits;
+            if (Codes == null || Bits == null) return;
+
+            ValueCount = 1 << valueCountPower;
+            ValueCountPower = valueCountPower;
+            ValueBits = Helpers.Log2(codes.Length) >> valueCountPower;
+            ValueMax = 1 << ValueBits;
+
+            int max = 0;
+            foreach (byte bitSize in bits)
+            {
+                max = Math.Max(max, bitSize);
+            }
+
+            MaxBitSize = max;
+            Lookup = CreateLookupTable();
+        }
+
+        private byte[] CreateLookupTable()
+        {
+            if (Codes == null || Bits == null) return null;
+
+            int tableSize = 1 << MaxBitSize;
+            var dest = new byte[tableSize];
+
+            for (int i = 0; i < Bits.Length; i++)
+            {
+                if (Bits[i] == 0) continue;
+                int unusedBits = MaxBitSize - Bits[i];
+
+                int start = Codes[i] << unusedBits;
+                int length = 1 << unusedBits;
+                int end = start + length;
+
+                for (int j = start; j < end; j++)
+                {
+                    dest[j] = (byte)i;
+                }
+            }
+            return dest;
+        }
+
+        public short[] Codes { get; }
+        public byte[] Bits { get; }
+        public byte[] Lookup { get; }
+        public int ValueCount { get; }
+        public int ValueCountPower { get; }
+        public int ValueBits { get; }
+        public int ValueMax { get; }
+        public int MaxBitSize { get; }
+    }
+}