ALSA: Allow configuration of output devices to use and change standard output plugin requested to "default"

[Mike Hearn]

These settings is not intended to be altered by normal users, 
however apparently some ALSA power users might need it. It makes
testing easier too. It was done on the advice of the ALSA developers.

Mike Hearn <mh at codeweavers.com>
Allow configuration of output devices to use and change standard
output plugin requested to "default"

Index: dlls/winmm/winealsa/audio.c
===================================================================
RCS file: /home/wine/wine/dlls/winmm/winealsa/audio.c,v
retrieving revision 1.31
diff -u -w -r1.31 audio.c
--- dlls/winmm/winealsa/audio.c 13 Feb 2004 20:44:12 -0000      1.31
+++ dlls/winmm/winealsa/audio.c 26 Mar 2004 15:48:25 -0000
@@ -50,6 +50,7 @@
 #include "winerror.h"
 #include "winuser.h"
 #include "winnls.h"
+#include "winreg.h"
 #include "mmddk.h"
 #include "dsound.h"
 #include "dsdriver.h"
@@ -148,7 +149,7 @@
     WAVEOUTCAPSA               caps;
  
     /* ALSA information (ALSA 0.9/1.x uses two different devices for playback/capture) */
-    char                       device[32];
+    char*                      device;
     snd_pcm_t*                  p_handle;                 /* handle to ALSA playback device */
     snd_pcm_t*                  c_handle;                 /* handle to ALSA capture device */
     snd_pcm_hw_params_t *      hw_params;              /* ALSA Hw params */
@@ -192,7 +193,7 @@
     WAVEOUTCAPSA               caps;
  
     /* ALSA information (ALSA 0.9/1.x uses two different devices for playback/capture) */
-    char                       device[32];
+    char*                      device;
     snd_pcm_t*                  p_handle;                 /* handle to ALSA playback device */
     snd_pcm_t*                  c_handle;                 /* handle to ALSA capture device */
     snd_pcm_hw_params_t *      hw_params;              /* ALSA Hw params */
@@ -471,7 +472,46 @@
  
 }
  
+/* return a string duplicated on the win32 process heap, free with HeapFree */
+static char* ALSA_strdup(char *s) {
+    char *result = HeapAlloc(GetProcessHeap(), 0, strlen(s)+1);
+    strcpy(result, s);
+    return result;
+}
+
+/******************************************************************
+ *             ALSA_GetDeviceFromReg
+ *
+ * Returns either "default" or reads the registry so the user can
+ * override the playback/record device used.
+ */
+char *ALSA_GetDeviceFromReg(char *value)
+{
+    DWORD res;
+    DWORD type;
+    HKEY playbackKey = 0;
+    char *result = NULL;
+    DWORD resultSize;
+
+    res = RegOpenKeyExA(HKEY_LOCAL_MACHINE, "Software\\Wine\\Wine\\Config\\ALSA", 0, KEY_QUERY_VALUE, &playbackKey);
+    if (res != ERROR_SUCCESS) goto end;
+
+    res = RegQueryValueExA(playbackKey, value, NULL, &type, NULL, &resultSize);
+    if (res != ERROR_SUCCESS) goto end;
  
+    if (type != REG_SZ) {
+       ERR("Registry key [HKEY_LOCAL_MACHINE\\Software\\Wine\\Wine\\ALSA\\%s] must be a string\n", value);
+       goto end;
+    }
+
+    result = HeapAlloc(GetProcessHeap(), 0, resultSize);
+    res = RegQueryValueExA(playbackKey, value, NULL, NULL, result, &resultSize);
+
+end:
+    if (!result) result = ALSA_strdup("default");
+    if (playbackKey) RegCloseKey(playbackKey);
+    return result;
+}
  
 /******************************************************************
  *             ALSA_WaveInit
@@ -489,7 +529,9 @@
     wwo = &WOutDev[0];
  
     /* FIXME: use better values */
-    strcpy(wwo->device, "hw");
+    wwo->device = ALSA_GetDeviceFromReg("PlaybackDevice");
+    TRACE("using waveout device \"%s\"\n", wwo->device);
+
     wwo->caps.wMid = 0x0002;
     wwo->caps.wPid = 0x0104;
     strcpy(wwo->caps.szPname, "SB16 Wave Out");
@@ -597,7 +639,9 @@
     wwi = &WInDev[0];
  
     /* FIXME: use better values */
-    strcpy(wwi->device, "hw");
+    wwi->device = ALSA_GetDeviceFromReg("RecordDevice");
+    TRACE("using wavein device \"%s\"\n", wwi->device);
+
     wwi->caps.wMid = 0x0002;
     wwi->caps.wPid = 0x0104;
     strcpy(wwi->caps.szPname, "SB16 Wave In");
@@ -1513,6 +1557,8 @@
        wwo->p_handle = NULL;
  
        ret = wodNotifyClient(wwo, WOM_CLOSE, 0L, 0L);
+
+       HeapFree(GetProcessHeap(), 0, wwo->device);
     }
  
     HeapFree(GetProcessHeap(), 0, wwo->ufds);
@@ -2998,6 +3044,8 @@
        wwi->p_handle = NULL;
  
        ret = widNotifyClient(wwi, WIM_CLOSE, 0L, 0L);
+
+       HeapFree(GetProcessHeap(), 0, wwi->device);
     }
  
     HeapFree(GetProcessHeap(), 0, wwi->ufds);