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Fix PBD::MMTIMER::reset_resolution and add some documentation

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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.
This commit is contained in:
Tim Mayberry 2015-09-14 10:29:00 +10:00
parent 62f75b8b16
commit a88b2da6a9
2 changed files with 50 additions and 50 deletions
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68
libs/pbd/windows_timer_utils.cc
View file

@ -29,20 +29,20 @@
namespace {
UINT&
old_timer_resolution ()
timer_resolution ()
{
static UINT timer_res_ms = 0;
return timer_res_ms;
}
} // anon namespace
}
namespace PBD {
namespace MMTIMERS {
bool
set_min_resolution ()
get_min_resolution (uint32_t& min_resolution_ms)
{
TIMECAPS caps;
@ -50,61 +50,57 @@ set_min_resolution ()
DEBUG_TIMING ("Could not get timer device capabilities.\n");
return false;
}
return set_resolution(caps.wPeriodMin);
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)
{
TIMECAPS caps;
if (timeGetDevCaps (&caps, sizeof(TIMECAPS)) != TIMERR_NOERROR) {
DEBUG_TIMING ("Could not get timer device capabilities.\n");
return false;
if (timer_resolution() != 0) {
DEBUG_TIMING(
"Timer resolution must be reset before setting new resolution.\n");
}
UINT old_timer_res = caps.wPeriodMin;
if (timeBeginPeriod(timer_resolution_ms) != TIMERR_NOERROR) {
DEBUG_TIMING(
string_compose("Could not set minimum timer resolution to %1(ms)\n",
string_compose("Could not set timer resolution to %1(ms)\n",
timer_resolution_ms));
return false;
}
old_timer_resolution () = old_timer_res;
timer_resolution() = timer_resolution_ms;
DEBUG_TIMING (string_compose ("Multimedia timer resolution set to %1(ms)\n",
caps.wPeriodMin));
return true;
}
bool
get_resolution (uint32_t& timer_resolution_ms)
{
TIMECAPS caps;
if (timeGetDevCaps(&caps, sizeof(TIMECAPS)) != TIMERR_NOERROR) {
DEBUG_TIMING ("Could not get timer device capabilities.\n");
return false;
}
timer_resolution_ms = caps.wPeriodMin;
timer_resolution_ms));
return true;
}
bool
reset_resolution ()
{
if (old_timer_resolution ()) {
if (timeEndPeriod (old_timer_resolution ()) != TIMERR_NOERROR) {
DEBUG_TIMING ("Could not reset timer resolution.\n");
return false;
}
// 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 (string_compose ("Multimedia timer resolution set to %1(ms)\n",
old_timer_resolution ()));
timer_resolution() = 0;
return true;
}