timeEndPeriod must be called with the same timer resolution value used in timeBeginPeriod. When the process exits the timer resolution is restored anyway so this is not very important.
181 lines
3.7 KiB
C++
181 lines
3.7 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 "pbd/windows_timer_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 "pbd/debug.h"
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#define DEBUG_TIMING(msg) DEBUG_TRACE (PBD::DEBUG::Timing, msg);
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namespace {
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UINT&
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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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}
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namespace PBD {
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namespace MMTIMERS {
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bool
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get_min_resolution (uint32_t& min_resolution_ms)
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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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}
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min_resolution_ms = caps.wPeriodMin;
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return true;
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}
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bool
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set_min_resolution ()
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{
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uint32_t min_resolution = 0;
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if (!get_min_resolution (min_resolution)) {
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return false;
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}
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if (!set_resolution (min_resolution)) {
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return false;
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}
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return true;
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}
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bool
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set_resolution (uint32_t timer_resolution_ms)
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{
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if (timer_resolution() != 0) {
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DEBUG_TIMING(
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"Timer resolution must be reset before setting new resolution.\n");
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}
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if (timeBeginPeriod(timer_resolution_ms) != TIMERR_NOERROR) {
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DEBUG_TIMING(
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string_compose("Could not set timer resolution to %1(ms)\n",
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timer_resolution_ms));
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return false;
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}
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timer_resolution() = timer_resolution_ms;
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DEBUG_TIMING (string_compose ("Multimedia timer resolution set to %1(ms)\n",
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timer_resolution_ms));
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return true;
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}
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bool
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reset_resolution ()
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{
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// You must match calls to timeBegin/EndPeriod with the same resolution
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if (timeEndPeriod(timer_resolution()) != TIMERR_NOERROR) {
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DEBUG_TIMING("Could not reset the Timer resolution.\n");
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return false;
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}
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timer_resolution() = 0;
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return true;
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}
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} // namespace MMTIMERS
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namespace {
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bool&
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qpc_frequency_success ()
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{
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static bool success = false;
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return success;
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}
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LARGE_INTEGER
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qpc_frequency ()
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{
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LARGE_INTEGER freq;
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if (QueryPerformanceFrequency(&freq) == 0) {
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DEBUG_TIMING ("Failed to determine frequency of QPC\n");
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qpc_frequency_success() = false;
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} else {
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qpc_frequency_success() = true;
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}
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return freq;
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}
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LARGE_INTEGER
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qpc_frequency_cached ()
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{
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static LARGE_INTEGER frequency = qpc_frequency ();
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return frequency;
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}
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} // anon namespace
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namespace QPC {
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bool
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get_timer_valid ()
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{
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// setup caching the timer frequency
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qpc_frequency_cached ();
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return qpc_frequency_success ();
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}
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int64_t
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get_microseconds ()
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{
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LARGE_INTEGER current_val;
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if (qpc_frequency_success()) {
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// MS docs say this will always succeed for systems >= XP but it may
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// not return a monotonic value with non-invariant TSC's etc
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if (QueryPerformanceCounter(¤t_val) != 0) {
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return (int64_t)(((double)current_val.QuadPart) /
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((double)qpc_frequency_cached().QuadPart) * 1000000.0);
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}
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}
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DEBUG_TIMING ("Could not get QPC timer\n");
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return -1;
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}
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} // namespace QPC
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int64_t
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get_microseconds ()
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{
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if (qpc_frequency_success()) {
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return QPC::get_microseconds ();
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}
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// For XP systems that don't support a high-res performance counter
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return g_get_monotonic_time ();
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}
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} // namespace PBD
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