add autodetect audio driver capability to winmm

[Robert Shearman]

James Hawkins wrote:

>Changelog:
>    * take audio autodetection out of winecfg and put it in winmm
>    * if driver is not found in the registry or the driver fails to
>load, then autodetect driver
>  
>

Thanks for another cool patch. It lessens the burden on the user.
CC'ing ros-kernel as explained below.

>Index: dlls/winmm/lolvldrv.c
>===================================================================
>RCS file: /home/wine/wine/dlls/winmm/lolvldrv.c,v
>retrieving revision 1.58
>diff -u -r1.58 lolvldrv.c
>--- dlls/winmm/lolvldrv.c	1 Jun 2004 19:40:48 -0000	1.58
>+++ dlls/winmm/lolvldrv.c	25 Jul 2004 22:05:54 -0000
>@@ -30,6 +30,8 @@
> #include "winver.h"
> #include "winemm.h"
> #include "wine/debug.h"
>+#include "config.h"
>+#include "wine/port.h"
> 
> WINE_DEFAULT_DEBUG_CHANNEL(winmm);
> 
>@@ -711,6 +713,80 @@
> }
> 
> /**************************************************************************
>+ * MMDRV_AutoDetectDriver [internal]
>+ * 
>+ * modified from programs/winecfg/audio.c
>+ */
>+BOOL MMDRV_AutoDetectDriver(void)
>+{
>+    struct stat buf;
>+    const char *argv_new[4];
>+    int fd;
>+
>+    char *driversFound[10];
>+    char *name[10];
>+    int numFound = 0;
>+
>+    argv_new[0] = "/bin/sh";
>

I think the ReactOS people may have a few comments to make on this, now 
that they are using this DLL in ReactOS.

>+    argv_new[1] = "-c";
>+    argv_new[3] = NULL;
>+
>+    /* try to detect arts */
>+    argv_new[2] = "ps awx|grep artsd|grep -v grep|grep artsd > /dev/null";
>+    if(!spawnvp(_P_WAIT, "/bin/sh", argv_new))
>+    {
>+        driversFound[numFound] = "winearts.drv";
>+        name[numFound] = "aRts";
>+        numFound++;
>+    }
>+
>+    /* try to detect jack */
>+    argv_new[2] = "ps awx|grep jackd|grep -v grep|grep jackd > /dev/null";
>+    if(!spawnvp(_P_WAIT, "/bin/sh", argv_new))
>+    {
>+        driversFound[numFound] = "winejack.drv";
>+        name[numFound] = "jack";
>+        numFound++;
>+    }
>+
>+    /* try to detect nas */
>+    /* TODO */
>+
>+    /* try to detect audioIO (solaris) */
>+    /* TODO */
>+
>+    /* try to detect alsa */
>+    if(!stat("/proc/asound", &buf))
>+    {
>+        driversFound[numFound] = "winealsa.drv";
>+        name[numFound] = "Alsa";
>+        numFound++;
>+    }
>+
>+    /* try to detect oss */
>+    fd = open("/dev/dsp", O_WRONLY | O_NONBLOCK);
>+    if(fd)
>+    {
>+        close(fd);
>+        driversFound[numFound] = "wineoss.drv";
>+        name[numFound] = "OSS";
>+        numFound++;
>+    }
>+
>+
>+    if (numFound == 0)
>+    {
>+        TRACE("Could not detect any audio devices/servers");
>+        return FALSE;
>+    }
>+    
>+    /* TODO: possibly smarter handling of multiple drivers? */
>+    TRACE("Found driver %s\n", name[0]);
>+    
>+    return MMDRV_Install(driversFound[0], driversFound[0], FALSE);
>+}
>+
>+/**************************************************************************
>  * 				MMDRV_InitFromRegistry		[internal]
>  */
> static BOOL	MMDRV_InitFromRegistry(void)
>@@ -729,7 +805,9 @@
>     }
> 
>     size = sizeof(buffer);
>-    if (!RegQueryValueExA(hKey, "Drivers", 0, &type, (LPVOID)buffer, &size)) {
>+    BOOL keyQueried = !RegQueryValueExA(hKey, "Drivers", 0, &type, 
>+                                        (LPVOID)buffer, &size);
>

This is only available in C99. We try to make Wine compile with as many 
C compilers as possible, including gcc 2.95, which doesn't allow this 
sort of thing.

>+    if (keyQueried) {
> 	p1 = buffer;
> 	while (p1) {
> 	    p2 = strchr(p1, ';');
>@@ -738,7 +816,11 @@
> 	    p1 = p2;
> 	}
>     }
>-
>+    
>+    /* if no driver specified in reg or driver fails to load then autodetect */
>+    if (!keyQueried || !ret)
>+        ret |= MMDRV_AutoDetectDriver();
>+        
>     /* finish with mappers */
>     size = sizeof(buffer);
>     if (!RegQueryValueExA(hKey, "WaveMapper", 0, &type, (LPVOID)buffer, &size))
>  
>

Rob