John Emmas
5122b7f8e1
(not sure why windows.h isn't already #including this for us - but it doesn't seem to be)
101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
/*
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* Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "win_utils.h"
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#include <windows.h>
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#include <mmsystem.h>
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#include "pbd/compose.h"
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#include "debug.h"
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namespace {
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LARGE_INTEGER
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get_frequency ()
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{
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LARGE_INTEGER freq;
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QueryPerformanceFrequency(&freq);
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return freq;
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}
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UINT&
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old_timer_resolution ()
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{
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static UINT timer_res_ms = 0;
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return timer_res_ms;
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}
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} // anon namespace
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namespace utils {
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bool
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set_min_timer_resolution ()
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{
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TIMECAPS caps;
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if (timeGetDevCaps (&caps, sizeof(TIMECAPS)) != TIMERR_NOERROR) {
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DEBUG_TIMING ("Could not get timer device capabilities.\n");
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return false;
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} else {
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old_timer_resolution () = caps.wPeriodMin;
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if (timeBeginPeriod (caps.wPeriodMin) != TIMERR_NOERROR) {
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DEBUG_TIMING (string_compose (
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"Could not set minimum timer resolution to %1(ms)\n", caps.wPeriodMin));
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return false;
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}
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}
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DEBUG_TIMING (string_compose ("Multimedia timer resolution set to %1(ms)\n",
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caps.wPeriodMin));
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return true;
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}
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bool
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reset_timer_resolution ()
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{
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if (old_timer_resolution ()) {
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if (timeEndPeriod (old_timer_resolution ()) != TIMERR_NOERROR) {
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DEBUG_TIMING ("Could not reset timer resolution.\n");
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return false;
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}
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}
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DEBUG_TIMING (string_compose ("Multimedia timer resolution set to %1(ms)\n",
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old_timer_resolution ()));
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return true;
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}
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uint64_t get_microseconds ()
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{
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static LARGE_INTEGER frequency = get_frequency ();
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LARGE_INTEGER current_val;
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QueryPerformanceCounter (¤t_val);
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return (uint64_t)(((double)current_val.QuadPart) /
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((double)frequency.QuadPart) * 1000000.0);
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}
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} // namespace utils
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