1 files changed, 147 insertions, 0 deletions
diff --git a/portaudio/src/os/win/pa_win_util.c b/portaudio/src/os/win/pa_win_util.c
new file mode 100644
index 0000000..e99bd0c
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+++ b/portaudio/src/os/win/pa_win_util.c
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+/*
+ * $Id: pa_win_util.c,v 1.1 2010/11/04 21:04:15 rbd Exp $
+ * Portable Audio I/O Library
+ * Win32 platform-specific support functions
+ *
+ * Based on the Open Source API proposed by Ross Bencina
+ * Copyright (c) 1999-2000 Ross Bencina
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files
+ * (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+ * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * The text above constitutes the entire PortAudio license; however, 
+ * the PortAudio community also makes the following non-binding requests:
+ *
+ * Any person wishing to distribute modifications to the Software is
+ * requested to send the modifications to the original developer so that
+ * they can be incorporated into the canonical version. It is also 
+ * requested that these non-binding requests be included along with the 
+ * license above.
+ */
+
+/** @file
+ @ingroup win_src
+
+ Win32 platform-specific support functions.
+
+    @todo Implement workaround for QueryPerformanceCounter() skipping forward
+    bug. (see msdn kb Q274323).
+*/
+ 
+#include <windows.h>
+#include <mmsystem.h> /* for timeGetTime() */
+
+#include "pa_util.h"
+
+
+/*
+   Track memory allocations to avoid leaks.
+ */
+
+#if PA_TRACK_MEMORY
+static int numAllocations_ = 0;
+#endif
+
+
+void *PaUtil_AllocateMemory( long size )
+{
+    void *result = GlobalAlloc( GPTR, size );
+
+#if PA_TRACK_MEMORY
+    if( result != NULL ) numAllocations_ += 1;
+#endif
+    return result;
+}
+
+
+void PaUtil_FreeMemory( void *block )
+{
+    if( block != NULL )
+    {
+        GlobalFree( block );
+#if PA_TRACK_MEMORY
+        numAllocations_ -= 1;
+#endif
+
+    }
+}
+
+
+int PaUtil_CountCurrentlyAllocatedBlocks( void )
+{
+#if PA_TRACK_MEMORY
+    return numAllocations_;
+#else
+    return 0;
+#endif
+}
+
+
+void Pa_Sleep( long msec )
+{
+    Sleep( msec );
+}
+
+static int usePerformanceCounter_;
+static double secondsPerTick_;
+
+void PaUtil_InitializeClock( void )
+{
+    LARGE_INTEGER ticksPerSecond;
+
+    if( QueryPerformanceFrequency( &ticksPerSecond ) != 0 )
+    {
+        usePerformanceCounter_ = 1;
+        secondsPerTick_ = 1.0 / (double)ticksPerSecond.QuadPart;
+    }
+    else
+    {
+        usePerformanceCounter_ = 0;
+    }
+}
+
+
+double PaUtil_GetTime( void )
+{
+    LARGE_INTEGER time;
+
+    if( usePerformanceCounter_ )
+    {
+        /* FIXME:
+            according to this knowledge-base article, QueryPerformanceCounter
+            can skip forward by seconds!
+            http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q274323&
+
+            it may be better to use the rtdsc instruction using inline asm,
+            however then a method is needed to calculate a ticks/seconds ratio.
+        */
+        QueryPerformanceCounter( &time );
+        return time.QuadPart * secondsPerTick_;
+    }
+    else
+    {
+#ifndef UNDER_CE    	
+        return timeGetTime() * .001;
+#else
+        return GetTickCount() * .001;
+#endif                
+    }
+}