v0.1: Robovoice — PTT re-voicing app

WinForms tray app that captures text (from file or direct input) and synthesizes speech via libpiper (Piper TTS), outputting to any audio device (VB-CABLE for virtual mic routing). Features: - Global PTT hotkey (configurable F1-F12) via WH_KEYBOARD_LL - Text file sequential reader (line-by-line on each PTT cycle) - Direct text input with Speak button - Voice manager: browse 147-voice Piper catalogue, download, remove - libpiper P/Invoke wrapper with UTF-8 marshaling, streaming chunks - BufferedWaveProvider streaming playback with trailing silence flush - Sentence terminator auto-append (fixes espeak-ng final-word drop) - Tray icon with minimize-to-tray Architecture: - Robovoice.Core: ITtsEngine, ISttSource interfaces, voice catalogue - Robovoice.Tts.LibPiper: P/Invoke wrapper for libpiper.dll - Robovoice.Stt.File: text file STT source (testing without mic server) - Robovoice.Stt.Udp: UDP client stub (for future Linux mic server) - Robovoice.App: WinForms UI, orchestrator, PTT hotkey, audio output
2026-08-10 11:27:28 +00:00
parent 03e6ccf388
commit 8585972a1e
25 changed files with 2005 additions and 0 deletions
@@ -0,0 +1,94 @@
+using System.Runtime.InteropServices;
+using System.Windows.Forms;
+
+namespace Robovoice.App;
+
+internal sealed class PttHotkey : IDisposable
+{
+    private const int WH_KEYBOARD_LL = 13;
+    private const int WM_KEYDOWN = 0x0100;
+    private const int WM_KEYUP = 0x0101;
+    private const int WM_SYSKEYDOWN = 0x0104;
+    private const int WM_SYSKEYUP = 0x0105;
+
+    private readonly LowLevelKeyboardProc _proc;
+    private IntPtr _hook = IntPtr.Zero;
+    private bool _isDown;
+    private bool _disposed;
+
+    public Keys Key { get; set; } = Keys.F8;
+
+    public event EventHandler? Pressed;
+    public event EventHandler? Released;
+
+    public PttHotkey()
+    {
+        _proc = HookCallback;
+    }
+
+    public void Install()
+    {
+        ObjectDisposedException.ThrowIf(_disposed, this);
+        if (_hook != IntPtr.Zero) return;
+
+        IntPtr hModule = GetModuleHandle(null);
+        _hook = SetWindowsHookEx(WH_KEYBOARD_LL, _proc, hModule, 0);
+    }
+
+    public void Uninstall()
+    {
+        if (_hook != IntPtr.Zero)
+        {
+            UnhookWindowsHookEx(_hook);
+            _hook = IntPtr.Zero;
+            _isDown = false;
+        }
+    }
+
+    private IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
+    {
+        if (nCode >= 0)
+        {
+            int vkCode = Marshal.ReadInt32(lParam);
+            Keys key = (Keys)vkCode;
+
+            bool isDown = wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN;
+            bool isUp = wParam == WM_KEYUP || wParam == WM_SYSKEYUP;
+
+            if (key == Key && isDown && !_isDown)
+            {
+                _isDown = true;
+                Pressed?.Invoke(this, EventArgs.Empty);
+            }
+            else if (key == Key && isUp && _isDown)
+            {
+                _isDown = false;
+                Released?.Invoke(this, EventArgs.Empty);
+            }
+        }
+
+        return CallNextHookEx(_hook, nCode, wParam, lParam);
+    }
+
+    public void Dispose()
+    {
+        if (_disposed) return;
+        Uninstall();
+        _disposed = true;
+    }
+
+    private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    [return: MarshalAs(UnmanagedType.Bool)]
+    private static extern bool UnhookWindowsHookEx(IntPtr hhk);
+
+    [DllImport("user32.dll", SetLastError = true)]
+    private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
+
+    [DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
+    private static extern IntPtr GetModuleHandle(string? lpModuleName);
+}