/* * $Id: pa_win_util.c,v 1.1.2.5 2002/10/18 18:36:57 rossbencina 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. * * 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. * * 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. */ #include #include /* 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 { return timeGetTime() * .001; } }