Bare-bones foundations of the ReactOS Audio Service. At present it's

nothing more than a "mutex service". Some info on the planned 
implementation is in the included audiosrv.txt file.


svn path=/trunk/; revision=29089

reactos/base/services/audiosrv/audiosrv.rbuild

@@ -0,0 +1,10 @@
+<module name="audiosrv" type="win32cui" installbase="system32" installname="audiosrv.exe" allowwarnings="true">
+	<include base="audiosrv">.</include>
+	<define name="__USE_W32API" />
+	<define name="__REACTOS__" />
+	<define name="_WIN32_WINNT">0x0501</define>
+	<library>kernel32</library>
+	<library>advapi32</library>
+	<file>main.c</file>
+	<file>audiosrv.rc</file>
+</module>

reactos/base/services/audiosrv/audiosrv.rc

@@ -0,0 +1,4 @@
+#define REACTOS_STR_FILE_DESCRIPTION	"ReactOS Audio Service"
+#define REACTOS_STR_INTERNAL_NAME	"audiosrv\0"
+#define REACTOS_STR_ORIGINAL_FILENAME	"audiosrv.dll\0"
+#include <reactos/version.rc>

reactos/base/services/audiosrv/audiosrv.txt

@@ -0,0 +1,39 @@
+ReactOS Audio Service (audiosrv.exe)
+====================================
+
+This is intended to operate in a similar manner to how the Windows Audio
+Service does.
+
+NOTE: The service filename is audiosrv.dll on Windows XP. This shouldn't
+have any impact on functionality.
+
+AudioSrv on Windows creates a mapped file at:
+Global\mmGlobalPnpInfo
+
+This file appears to contain a list of devices that WinMM accesses and
+subsequently passes to wdmaud.drv
+
+It is not necessary to duplicate the exact structure of this mapped 
+file, since it appears to only be used internally by Windows components.
+
+The ROS Audio Service (RosAudioSrv) is intended to be able to run 
+alongside the Windows Audio Service on XP/Vista, so it should be 
+possible to test in a "known working environment" ;)
+
+It will create a mutex, to:
+1) Allow synchronization when accessing the device list
+2) Provide a simple method of identifying if RosAudioSrv is running
+
+(It might be worth using an event to notify WinMM when things are 
+happening?)
+
+The intention is to make RosAudioSrv receive PnP notifications for 
+relevant audio devices, and also let AudioSrv in Windows do this. Then 
+it should be possible to create a small application that imitates 
+WinMM's actions :)
+
+So far, it doesn't do much... Watch this space!
+
+
+Andrew Greenwood
+September 2007

reactos/base/services/audiosrv/main.c

@@ -0,0 +1,117 @@
+/*
+ * PROJECT:          ReactOS
+ * LICENSE:          GPL - See COPYING in the top level directory
+ * FILE:             base/services/audiosrv/main.c
+ * PURPOSE:          Audio Service
+ * COPYRIGHT:        Copyright 2007 Andrew Greenwood
+ */
+
+#include <windows.h>
+
+/* This is currently set to avoid conflicting service names in Windows! */
+#define SERVICE_NAME                "RosAudioSrv"
+
+/* A named mutex is used for synchronizing access to the device list.
+   If this mutex doesn't exist, it means the audio service isn't running. */
+#define DEVICE_LIST_MUTEX_NAME      "Global\\AudioDeviceListSync"
+
+/* ...and this is where the device list will be available */
+#define DEVICE_LIST_MAPPED_FILENAME "Global\\AudioDeviceList"
+
+
+
+/* Prototypes */
+
+VOID CALLBACK
+ServiceMain(DWORD argc, char** argv);
+
+VOID WINAPI
+ServiceControlHandler(DWORD request);
+
+
+/* Service table */
+SERVICE_TABLE_ENTRY service_table[2] =
+{
+    { "AudioSrv", (LPSERVICE_MAIN_FUNCTION) ServiceMain },
+    { NULL, NULL }
+};
+
+SERVICE_STATUS_HANDLE service_status_handle;
+SERVICE_STATUS service_status;
+
+/* Synchronization of access to the event list */
+HANDLE device_list_mutex = INVALID_HANDLE_VALUE;
+
+
+/* Implementation */
+
+VOID WINAPI
+ServiceControlHandler(DWORD request)
+{
+    switch ( request )
+    {
+        case SERVICE_CONTROL_STOP :
+        case SERVICE_CONTROL_SHUTDOWN :
+        {
+            service_status.dwCurrentState = SERVICE_STOP_PENDING;
+            SetServiceStatus(service_status_handle, &service_status);
+
+            CloseHandle(device_list_mutex);
+
+            service_status.dwWin32ExitCode = 0;
+            service_status.dwCurrentState = SERVICE_STOPPED;
+
+            SetServiceStatus(service_status_handle, &service_status);
+
+            return;
+        }
+
+
+        default :
+            break;
+    };
+
+    SetServiceStatus(service_status_handle, &service_status);
+}
+
+VOID CALLBACK
+ServiceMain(DWORD argc, char** argv)
+{
+    service_status_handle = RegisterServiceCtrlHandler(SERVICE_NAME,
+                                                       ServiceControlHandler);
+
+    /* Set these to defaults */
+    service_status.dwServiceType = SERVICE_WIN32_OWN_PROCESS;
+    service_status.dwServiceSpecificExitCode = 0;
+    service_status.dwWin32ExitCode = NO_ERROR;
+    service_status.dwWaitHint = 0;
+    service_status.dwControlsAccepted = 0;
+    service_status.dwCheckPoint = 0;
+
+    /* Tell SCM we're starting */
+    service_status.dwCurrentState = SERVICE_START_PENDING;
+    SetServiceStatus(service_status_handle, &service_status);
+
+    /* We should create the mapped section here along with the mutex to
+       sync access to the device list... */
+
+    device_list_mutex = CreateMutex(NULL, FALSE, DEVICE_LIST_MUTEX_NAME);
+
+    if ( ! device_list_mutex)
+    {
+        service_status.dwCurrentState = SERVICE_STOPPED;
+        service_status.dwWin32ExitCode = -1;    // ok?
+        SetServiceStatus(service_status_handle, &service_status);
+        return;
+    }
+
+    /* Tell SCM we are now running, and we may be stopped */
+    service_status.dwCurrentState = SERVICE_RUNNING;
+    service_status.dwControlsAccepted = SERVICE_ACCEPT_STOP;
+    SetServiceStatus(service_status_handle, &service_status);
+}
+
+int main()
+{
+    StartServiceCtrlDispatcher(service_table);
+}

reactos/base/services/services.rbuild

@@ -1,6 +1,9 @@
 <?xml version="1.0"?>
 <!DOCTYPE group SYSTEM "../../tools/rbuild/project.dtd">
 <group xmlns:xi="http://www.w3.org/2001/XInclude">
+<directory name="audiosrv">
+	<xi:include href="audiosrv/audiosrv.rbuild" />
+</directory>
 <directory name="dhcp">
 	<xi:include href="dhcp/dhcp.rbuild" />
 </directory>