Add new VideoConference module for muting mic/cam (#11798)

* add new VideoConference module for muting mic/cam

Co-authored-by: PrzemyslawTusinski <61138537+PrzemyslawTusinski@users.noreply.github.com>
Co-authored-by: Niels Laute <niels.laute@live.nl>

src/common/SettingsAPI/FileWatcher.cpp

@@ -0,0 +1,68 @@
+#include "pch.h"
+#include "FileWatcher.h"
+
+std::optional<FILETIME> FileWatcher::MyFileTime()
+{
+    HANDLE hFile = CreateFileW(m_path.c_str(), FILE_READ_ATTRIBUTES, FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE, nullptr, OPEN_EXISTING, 0, nullptr);
+    std::optional<FILETIME> result;
+    if (hFile != INVALID_HANDLE_VALUE)
+    {
+        FILETIME lastWrite;
+        if (GetFileTime(hFile, nullptr, nullptr, &lastWrite))
+        {
+            result = lastWrite;
+        }
+
+        CloseHandle(hFile);
+    }
+
+    return result;
+}
+
+void FileWatcher::Run()
+{
+    while (1)
+    {
+        auto lastWrite = MyFileTime();
+        if (!m_lastWrite.has_value())
+        {
+            m_lastWrite = lastWrite;
+        }
+        else if (lastWrite.has_value())
+        {
+            if (m_lastWrite->dwHighDateTime != lastWrite->dwHighDateTime ||
+                m_lastWrite->dwLowDateTime != lastWrite->dwLowDateTime)
+            {
+                m_lastWrite = lastWrite;
+                m_callback();
+            }
+        }
+
+        if (WaitForSingleObject(m_abortEvent, m_refreshPeriod) == WAIT_OBJECT_0)
+        {
+            return;
+        }
+    }
+}
+
+FileWatcher::FileWatcher(const std::wstring& path, std::function<void()> callback, DWORD refreshPeriod) :
+    m_refreshPeriod(refreshPeriod),
+    m_path(path),
+    m_callback(callback)
+{
+    m_abortEvent = CreateEventW(nullptr, TRUE, FALSE, nullptr);
+    if (m_abortEvent)
+    {
+        m_thread = std::thread([this]() { Run(); });
+    }
+}
+
+FileWatcher::~FileWatcher()
+{
+    if (m_abortEvent)
+    {
+        SetEvent(m_abortEvent);
+        m_thread.join();
+        CloseHandle(m_abortEvent);
+    }
+}

src/common/SettingsAPI/FileWatcher.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#define WIN32_LEAN_AND_MEAN
+#define NOMINMAX
+#include <Windows.h>
+
+#include <thread>
+#include <optional>
+#include <string>
+#include <functional>
+
+class FileWatcher
+{
+    DWORD m_refreshPeriod;
+    std::wstring m_path;
+    std::optional<FILETIME> m_lastWrite;
+    std::function<void()> m_callback;
+    HANDLE m_abortEvent;
+    std::thread m_thread;
+    
+    std::optional<FILETIME> MyFileTime();
+    void Run();
+public:
+    FileWatcher(const std::wstring& path, std::function<void()> callback, DWORD refreshPeriod = 1000);
+    ~FileWatcher();
+};

src/common/SettingsAPI/SetttingsAPI.vcxproj

@@ -28,10 +28,12 @@
     <ClInclude Include="pch.h" />
     <ClInclude Include="settings_helpers.h" />
     <ClInclude Include="settings_objects.h" />
+    <ClInclude Include="FileWatcher.h" />
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="settings_helpers.cpp" />
     <ClCompile Include="settings_objects.cpp" />
+    <ClCompile Include="FileWatcher.cpp" />
     <ClCompile Include="pch.cpp">
       <PrecompiledHeader Condition="'$(CIBuild)'!='true'">Create</PrecompiledHeader>
     </ClCompile>

src/common/SettingsAPI/settings_helpers.h

@@ -8,6 +8,7 @@ namespace PTSettingsHelper
 {
     constexpr inline const wchar_t* log_settings_filename = L"log_settings.json";
 
+    std::wstring get_powertoys_general_save_file_location();
     std::wstring get_module_save_file_location(std::wstring_view powertoy_key);
     std::wstring get_module_save_folder_location(std::wstring_view powertoy_name);
     std::wstring get_root_save_folder_location();