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livetrax/libs/pbd/windows_timer_utils.cc

115 lines
2.6 KiB
C++

/*
* Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "pbd/windows_timer_utils.h"
#include <windows.h>
#include <mmsystem.h>
#include "pbd/compose.h"
#include "pbd/debug.h"
#include "pbd/error.h"
#include "pbd/i18n.h"
#define DEBUG_TIMING(msg) DEBUG_TRACE (PBD::DEBUG::Timing, msg);
namespace {
static
UINT&
timer_resolution ()
{
static UINT timer_res_ms = 0;
return timer_res_ms;
}
} // namespace
namespace PBD {
namespace MMTIMERS {
bool
get_min_resolution (uint32_t& min_resolution_ms)
{
TIMECAPS caps;
if (timeGetDevCaps (&caps, sizeof(TIMECAPS)) != TIMERR_NOERROR) {
DEBUG_TIMING ("Could not get timer device capabilities.\n");
return false;
}
min_resolution_ms = caps.wPeriodMin;
return true;
}
bool
set_min_resolution ()
{
uint32_t min_resolution = 0;
if (!get_min_resolution (min_resolution)) {
return false;
}
if (!set_resolution (min_resolution)) {
return false;
}
return true;
}
bool
set_resolution (uint32_t timer_resolution_ms)
{
if (timer_resolution() != 0) {
DEBUG_TIMING(
"Timer resolution must be reset before setting new resolution.\n");
}
if (timeBeginPeriod(timer_resolution_ms) != TIMERR_NOERROR) {
DEBUG_TIMING(
string_compose("Could not set timer resolution to %1(ms)\n",
timer_resolution_ms));
return false;
}
timer_resolution() = timer_resolution_ms;
DEBUG_TIMING (string_compose ("Multimedia timer resolution set to %1(ms)\n",
timer_resolution_ms));
return true;
}
bool
reset_resolution ()
{
// You must match calls to timeBegin/EndPeriod with the same resolution
if (timeEndPeriod(timer_resolution()) != TIMERR_NOERROR) {
DEBUG_TIMING("Could not reset the Timer resolution.\n");
return false;
}
DEBUG_TIMING("Reset the Timer resolution.\n");
timer_resolution() = 0;
return true;
}
} // namespace MMTIMERS
} // namespace PBD