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[GUI] Added Atrac9 audio decoder and improved GUI with audio preview and controller support (#64)
* [GUI] Added Atrac9 audio decoder and improved GUI with audio preview and controller support * fix: package.lock.json for SharpEmu.CLI to match the other projects * fix: packages.lock.json file to include new dependencies for GUI improvements * rollForward: "disable"
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// Copyright (C) 2026 SharpEmu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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using System.Buffers.Binary;
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using System.Runtime.InteropServices;
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using System.Text;
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using LibAtrac9;
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namespace SharpEmu.GUI;
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/// <summary>
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/// Loops a game's sce_sys/snd0.at9 preview music while the game is selected
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/// in the library, like the console home screen. The ATRAC9 stream is decoded
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/// to WAV on a background task (vendored LibAtrac9); playback uses winmm's
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/// PlaySound, so this is Windows-only and a no-op elsewhere.
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/// </summary>
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internal sealed class SndPreviewPlayer
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{
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private const uint SND_ASYNC = 0x0001;
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private const uint SND_NODEFAULT = 0x0002;
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private const uint SND_MEMORY = 0x0004;
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private const uint SND_LOOP = 0x0008;
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private readonly object _sync = new();
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private int _generation;
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private GCHandle _pinnedWav;
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private bool _playing;
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private bool _paused;
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private string? _cachedPath;
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private byte[]? _cachedWav;
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/// <summary>Starts looping the given snd0.at9 after a short debounce.</summary>
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public void Play(string at9Path)
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{
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if (!OperatingSystem.IsWindows())
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{
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return;
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}
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int generation;
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lock (_sync)
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{
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generation = ++_generation;
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}
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_ = Task.Run(async () =>
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{
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// Debounce so skimming through the library does not decode (or
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// start) a preview per tile.
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await Task.Delay(300).ConfigureAwait(false);
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byte[]? wav;
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lock (_sync)
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{
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if (generation != _generation)
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{
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return;
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}
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wav = string.Equals(_cachedPath, at9Path, StringComparison.OrdinalIgnoreCase)
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? _cachedWav
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: null;
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}
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if (wav is null)
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{
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try
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{
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wav = DecodeAt9ToWav(File.ReadAllBytes(at9Path));
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}
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catch (Exception)
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{
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return; // corrupt or unsupported preview: stay silent
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}
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}
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lock (_sync)
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{
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if (generation != _generation)
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{
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return;
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}
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_cachedPath = at9Path;
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_cachedWav = wav;
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StopLocked();
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// The WAV image must stay pinned while winmm plays from it.
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_pinnedWav = GCHandle.Alloc(wav, GCHandleType.Pinned);
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_playing = PlaySound(_pinnedWav.AddrOfPinnedObject(), 0, SND_MEMORY | SND_ASYNC | SND_LOOP | SND_NODEFAULT);
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if (!_playing)
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{
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_pinnedWav.Free();
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}
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}
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});
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}
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public void Stop()
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{
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if (!OperatingSystem.IsWindows())
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{
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return;
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}
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lock (_sync)
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{
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_generation++;
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StopLocked();
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}
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}
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/// <summary>
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/// Silences playback but keeps the decoded track ready, so
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/// <see cref="Resume"/> can restart it (winmm cannot truly pause).
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/// </summary>
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public void Pause()
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{
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if (!OperatingSystem.IsWindows())
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{
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return;
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}
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lock (_sync)
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{
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if (!_playing)
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{
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return;
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}
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_ = PlaySound(0, 0, 0);
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_playing = false;
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_paused = true;
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}
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}
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/// <summary>Restarts the track silenced by <see cref="Pause"/>.</summary>
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public void Resume()
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{
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if (!OperatingSystem.IsWindows())
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{
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return;
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}
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lock (_sync)
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{
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if (!_paused || !_pinnedWav.IsAllocated)
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{
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return;
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}
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_paused = false;
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_playing = PlaySound(_pinnedWav.AddrOfPinnedObject(), 0, SND_MEMORY | SND_ASYNC | SND_LOOP | SND_NODEFAULT);
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}
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}
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private void StopLocked()
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{
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_ = PlaySound(0, 0, 0);
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_playing = false;
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_paused = false;
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if (_pinnedWav.IsAllocated)
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{
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_pinnedWav.Free();
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}
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}
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private static readonly Guid Atrac9SubFormat = new("47E142D2-36BA-4D8D-88FC-61654F8C836C");
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/// <summary>
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/// Decodes a Sony AT9 (RIFF-wrapped ATRAC9) file to a PCM16 WAV image.
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/// Layout per Sony's container: an extensible fmt chunk whose extension
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/// carries the 4-byte codec config, a fact chunk with the sample count
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/// and encoder delay, and superframes in the data chunk.
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/// </summary>
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private static byte[] DecodeAt9ToWav(byte[] file)
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{
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using var reader = new BinaryReader(new MemoryStream(file), Encoding.ASCII);
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if (Encoding.ASCII.GetString(reader.ReadBytes(4)) != "RIFF")
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{
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throw new InvalidDataException("Not a RIFF file.");
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}
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reader.BaseStream.Position += 4; // riff size
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if (Encoding.ASCII.GetString(reader.ReadBytes(4)) != "WAVE")
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{
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throw new InvalidDataException("Not a WAVE file.");
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}
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byte[]? configData = null;
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var sampleCount = 0;
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var encoderDelay = 0;
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var dataOffset = -1;
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var dataSize = 0;
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while (reader.BaseStream.Position + 8 <= reader.BaseStream.Length)
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{
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var chunkId = Encoding.ASCII.GetString(reader.ReadBytes(4));
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var chunkSize = reader.ReadInt32();
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var chunkStart = reader.BaseStream.Position;
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switch (chunkId)
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{
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case "fmt ":
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var formatTag = reader.ReadUInt16();
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reader.BaseStream.Position = chunkStart + 24; // to SubFormat GUID
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var subFormat = new Guid(reader.ReadBytes(16));
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if (formatTag != 0xFFFE || subFormat != Atrac9SubFormat)
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{
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throw new InvalidDataException("Not an ATRAC9 stream.");
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}
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reader.BaseStream.Position += 4; // version info
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configData = reader.ReadBytes(4);
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break;
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case "fact":
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sampleCount = reader.ReadInt32();
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reader.BaseStream.Position += 4; // input overlap delay
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encoderDelay = reader.ReadInt32();
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break;
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case "data":
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dataOffset = (int)chunkStart;
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dataSize = chunkSize;
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break;
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}
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reader.BaseStream.Position = chunkStart + chunkSize + (chunkSize & 1);
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}
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if (configData is null || sampleCount <= 0 || dataOffset < 0)
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{
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throw new InvalidDataException("Missing fmt, fact, or data chunk.");
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}
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var decoder = new Atrac9Decoder();
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decoder.Initialize(configData);
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var config = decoder.Config;
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var superframeCount = (sampleCount + encoderDelay + config.SuperframeSamples - 1) / config.SuperframeSamples;
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superframeCount = Math.Min(superframeCount, dataSize / config.SuperframeBytes);
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var channels = config.ChannelCount;
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var pcmBuffer = new short[channels][];
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for (var i = 0; i < channels; i++)
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{
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pcmBuffer[i] = new short[config.SuperframeSamples];
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}
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var wav = new byte[44 + (sampleCount * channels * 2)];
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WriteWavHeader(wav, channels, config.SampleRate, sampleCount);
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var superframe = new byte[config.SuperframeBytes];
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var decodedIndex = 0L; // per-channel, includes the encoder delay
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var written = 0;
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for (var f = 0; f < superframeCount && written < sampleCount; f++)
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{
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Buffer.BlockCopy(file, dataOffset + (f * config.SuperframeBytes), superframe, 0, config.SuperframeBytes);
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decoder.Decode(superframe, pcmBuffer);
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for (var s = 0; s < config.SuperframeSamples && written < sampleCount; s++)
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{
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if (decodedIndex++ < encoderDelay)
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{
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continue;
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}
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var sampleOffset = 44 + ((long)written * channels * 2);
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for (var ch = 0; ch < channels; ch++)
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{
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BinaryPrimitives.WriteInt16LittleEndian(
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wav.AsSpan((int)(sampleOffset + (ch * 2))),
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pcmBuffer[ch][s]);
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}
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written++;
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}
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}
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return wav;
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}
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private static void WriteWavHeader(byte[] wav, int channels, int sampleRate, int sampleCount)
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{
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var span = wav.AsSpan();
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Encoding.ASCII.GetBytes("RIFF").CopyTo(span);
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BinaryPrimitives.WriteInt32LittleEndian(span[4..], wav.Length - 8);
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Encoding.ASCII.GetBytes("WAVE").CopyTo(span[8..]);
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Encoding.ASCII.GetBytes("fmt ").CopyTo(span[12..]);
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BinaryPrimitives.WriteInt32LittleEndian(span[16..], 16);
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BinaryPrimitives.WriteInt16LittleEndian(span[20..], 1); // PCM
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BinaryPrimitives.WriteInt16LittleEndian(span[22..], (short)channels);
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BinaryPrimitives.WriteInt32LittleEndian(span[24..], sampleRate);
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BinaryPrimitives.WriteInt32LittleEndian(span[28..], sampleRate * channels * 2);
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BinaryPrimitives.WriteInt16LittleEndian(span[32..], (short)(channels * 2));
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BinaryPrimitives.WriteInt16LittleEndian(span[34..], 16); // bits per sample
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Encoding.ASCII.GetBytes("data").CopyTo(span[36..]);
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BinaryPrimitives.WriteInt32LittleEndian(span[40..], sampleCount * channels * 2);
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}
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[DllImport("winmm.dll")]
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[return: MarshalAs(UnmanagedType.Bool)]
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private static extern bool PlaySound(nint sound, nint module, uint flags);
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}
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