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
2026-07-30 22:49:53 +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 +1,93 @@
+// SPDX-License-Identifier: MIT
+#nullable disable
+namespace LibAtrac9
+{
+    internal class Block
+    {
+        public Atrac9Config Config { get; }
+        public BlockType BlockType { get; }
+        public int BlockIndex { get; }
+        public Frame Frame { get; }
+
+        public Channel[] Channels { get; }
+        public int ChannelCount { get; }
+
+        public bool FirstInSuperframe { get; set; }
+        public bool ReuseBandParams { get; set; }
+
+        public int BandCount { get; set; }
+        public int StereoBand { get; set; }
+        public int ExtensionBand { get; set; }
+        public int QuantizationUnitCount { get; set; }
+        public int StereoQuantizationUnit { get; set; }
+        public int ExtensionUnit { get; set; }
+        public int QuantizationUnitsPrev { get; set; }
+
+        public int[] Gradient { get; } = new int[31];
+        public int GradientMode { get; set; }
+        public int GradientStartUnit { get; set; }
+        public int GradientStartValue { get; set; }
+        public int GradientEndUnit { get; set; }
+        public int GradientEndValue { get; set; }
+        public int GradientBoundary { get; set; }
+
+        public int PrimaryChannelIndex { get; set; }
+        public int[] JointStereoSigns { get; } = new int[30];
+        public bool HasJointStereoSigns { get; set; }
+        public Channel PrimaryChannel => Channels[PrimaryChannelIndex == 0 ? 0 : 1];
+        public Channel SecondaryChannel => Channels[PrimaryChannelIndex == 0 ? 1 : 0];
+
+        public bool BandExtensionEnabled { get; set; }
+        public bool HasExtensionData { get; set; }
+        public int BexDataLength { get; set; }
+        public int BexMode { get; set; }
+
+        public Block(Frame parentFrame, int blockIndex)
+        {
+            Frame = parentFrame;
+            BlockIndex = blockIndex;
+            Config = parentFrame.Config;
+            BlockType = Config.ChannelConfig.BlockTypes[blockIndex];
+            ChannelCount = BlockTypeToChannelCount(BlockType);
+            Channels = new Channel[ChannelCount];
+            for (int i = 0; i < ChannelCount; i++)
+            {
+                Channels[i] = new Channel(this, i);
+            }
+        }
+
+        public static int BlockTypeToChannelCount(BlockType blockType)
+        {
+            switch (blockType)
+            {
+                case BlockType.Mono:
+                    return 1;
+                case BlockType.Stereo:
+                    return 2;
+                case BlockType.LFE:
+                    return 1;
+                default:
+                    return 0;
+            }
+        }
+    }
+
+    /// <summary>
+    /// An ATRAC9 block (substream) type
+    /// </summary>
+    public enum BlockType
+    {
+        /// <summary>
+        /// Mono ATRAC9 block
+        /// </summary>
+        Mono = 0,
+        /// <summary>
+        /// Stereo ATRAC9 block
+        /// </summary>
+        Stereo = 1,
+        /// <summary>
+        /// Low-frequency effects ATRAC9 block
+        /// </summary>
+        LFE = 2
+    }
+}