diff -ru libao-1.2.0.orig/src/ao_wmm.c libao-1.2.0/src/ao_wmm.c
--- libao-1.2.0.orig/src/ao_wmm.c	2012-02-14 00:46:06.000000000 +0000
+++ libao-1.2.0/src/ao_wmm.c	2022-08-26 14:17:15.193852800 +0000
@@ -31,9 +31,7 @@
 #define _CRT_SECURE_NO_DEPRECATE
 
 #include <windows.h>
-#include <mmreg.h>
 #include <mmsystem.h>
-#include <ksmedia.h>
 
 #include <stdlib.h>
 #include <string.h>
@@ -41,6 +39,47 @@
 #include <stdarg.h>
 #include <stdio.h>
 
+#define waveOutGetErrorText waveOutGetErrorTextA
+#define waveOutGetDevCaps waveOutGetDevCapsA
+
+#ifndef WAVE_MAPPER
+#define WAVE_MAPPER ((unsigned int)-1)
+#endif
+
+#ifndef WAVE_FORMAT_EXTENSIBLE
+#define WAVE_FORMAT_EXTENSIBLE 0xFFFE
+#endif
+
+#ifndef WAVE_ALLOWSYNC
+#define WAVE_ALLOWSYNC 0x0002
+#endif
+
+#ifndef CALLBACK_NULL
+#define CALLBACK_NULL (unsigned int)(0x00000000)
+#endif
+
+typedef struct {
+	WAVEFORMATEX Format;
+	union {
+		WORD wValidBitsPerSample;
+		WORD wSamplesPerBlock;
+		WORD wReserved;
+	} Samples;
+	DWORD dwChannelMask;
+	GUID SubFormat;
+} WAVEFORMATEXTENSIBLE,*PWAVEFORMATEXTENSIBLE;
+
+typedef struct tagWAVEOUTCAPSA {
+	WORD wMid;
+	WORD wPid;
+	UINT vDriverVersion;
+	CHAR szPname[32];
+	DWORD dwFormats;
+	WORD wChannels;
+	WORD wReserved1;
+	DWORD dwSupport;
+} WAVEOUTCAPS;
+
 #ifndef KSDATAFORMAT_SUBTYPE_PCM
 #define KSDATAFORMAT_SUBTYPE_PCM (GUID) {0x00000001,0x0000,0x0010,{0x80,0x00,0x00,0xaa,0x00,0x38,0x9b,0x71}}
 #endif
@@ -339,7 +378,7 @@
       unsigned int ms = (internal->msPerBlock>>1)+1;
       if (wait_all) ms *= n;
       adebug("sleep for %ums wait on %d blocks\n",ms, internal->sent_blocks);
-      Sleep(ms);
+      usleep(ms * 1000);
     }
   }
 
@@ -558,7 +597,7 @@
     const int idx = _ao_get_free_block(device);
 
     if (idx == -1) {
-      Sleep(internal->msPerBlock);
+      usleep(internal->msPerBlock * 1000);
       continue;
     }
 
@@ -572,7 +611,7 @@
     }
 
     /* Do copy */
-    CopyMemory((char*)internal->wh[idx].wh.lpData
+    memcpy((char*)internal->wh[idx].wh.lpData
 	       + internal->wh[idx].count,
 	       output_samples, n);