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/*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "win_utils.h"
#include <windows.h>
#include <mmsystem.h>
#include "pbd/compose.h"
#include "debug.h"
namespace {
bool&
qpc_frequency_success ()
{
static bool success = false;
return success;
}
LARGE_INTEGER
qpc_frequency ()
{
LARGE_INTEGER freq;
if (QueryPerformanceFrequency(&freq) == 0) {
DEBUG_TIMING ("Failed to determine frequency of QPC\n");
qpc_frequency_success() = false;
} else {
qpc_frequency_success() = true;
}
return freq;
}
UINT&
old_timer_resolution ()
{
static UINT timer_res_ms = 0;
return timer_res_ms;
}
} // anon namespace
namespace utils {
bool
set_min_timer_resolution ()
{
TIMECAPS caps;
if (timeGetDevCaps (&caps, sizeof(TIMECAPS)) != TIMERR_NOERROR) {
DEBUG_TIMING ("Could not get timer device capabilities.\n");
return false;
} else {
old_timer_resolution () = caps.wPeriodMin;
if (timeBeginPeriod (caps.wPeriodMin) != TIMERR_NOERROR) {
DEBUG_TIMING (string_compose (
"Could not set minimum timer resolution to %1(ms)\n", caps.wPeriodMin));
return false;
}
}
DEBUG_TIMING (string_compose ("Multimedia timer resolution set to %1(ms)\n",
caps.wPeriodMin));
return true;
}
bool
reset_timer_resolution ()
{
if (old_timer_resolution ()) {
if (timeEndPeriod (old_timer_resolution ()) != TIMERR_NOERROR) {
DEBUG_TIMING ("Could not reset timer resolution.\n");
return false;
}
}
DEBUG_TIMING (string_compose ("Multimedia timer resolution set to %1(ms)\n",
old_timer_resolution ()));
return true;
}
int64_t
get_microseconds ()
{
static LARGE_INTEGER frequency = qpc_frequency ();
LARGE_INTEGER current_val;
if (qpc_frequency_success()) {
// MS docs say this will always succeed for systems >= XP but it may
// not return a monotonic value with non-invariant TSC's etc
if (QueryPerformanceCounter(¤t_val) != 0) {
return (int64_t)(((double)current_val.QuadPart) /
((double)frequency.QuadPart) * 1000000.0);
} else {
DEBUG_TIMING ("Could not get QPC timer\n");
}
return -1;
}
// For XP systems that don't support a high-res performance counter
return g_get_monotonic_time ();
}
} // namespace utils
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