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Windows: unconditionally request high timer resolution 

Previously timeBeginPeriod() was only called when MIDI
system was set to WinMME. It was also possible that
it was never unset in case starting the engine failed.

This significantly speeds up freewheel export which uses
Glib::usleep(100) when MIDI is disabled.

see also: https://randomascii.wordpress.com/2020/10/04/windows-timer-resolution-the-great-rule-change/
This commit is contained in:
Robin Gareus 2023-06-05 00:02:54 +02:00
parent fbfeff4168
commit c24b456211
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
3 changed files with 10 additions and 4 deletions
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7
libs/backends/dummy/dummy_audiobackend.cc
View File

@ -932,6 +932,10 @@ DummyAudioBackend::main_process_thread ()
manager.registration_callback();
manager.graph_order_callback();
#ifdef PLATFORM_WINDOWS
PBD::MMTIMERS::set_min_resolution();
#endif
int64_t clock1;
clock1 = -1;
while (_running) {
@ -1036,6 +1040,9 @@ DummyAudioBackend::main_process_thread ()
}
}
#ifdef PLATFORM_WINDOWS
PBD::MMTIMERS::reset_resolution();
#endif
_running = false;
return 0;
}

3
libs/backends/portaudio/portaudio_backend.cc
View File

@ -681,12 +681,14 @@ PortAudioBackend::_start (bool for_latency_measurement)
if (!start_blocking_process_thread()) {
return ProcessThreadStartError;
}
PBD::MMTIMERS::set_min_resolution();
} else {
if (_pcmio->start_stream() != paNoError) {
DEBUG_AUDIO("Unable to start stream\n");
return AudioDeviceOpenError;
}
PBD::MMTIMERS::set_min_resolution();
if (!start_freewheel_process_thread()) {
DEBUG_AUDIO("Unable to start freewheel thread\n");
stop();
@ -833,6 +835,7 @@ PortAudioBackend::stop ()
}
_midiio->stop();
PBD::MMTIMERS::reset_resolution();
_run = false;

4
libs/backends/portaudio/winmmemidi_io.cc
View File

@ -26,7 +26,6 @@
#include "pbd/error.h"
#include "pbd/compose.h"
#include "pbd/windows_timer_utils.h"
#include "winmmemidi_io.h"
#include "debug.h"
@ -137,7 +136,6 @@ WinMMEMidiIO::start ()
m_run = true;
DEBUG_MIDI ("Starting MIDI driver\n");
PBD::MMTIMERS::set_min_resolution();
discover();
start_devices ();
}
@ -156,8 +154,6 @@ WinMMEMidiIO::stop ()
pthread_mutex_lock (&m_device_lock);
cleanup ();
pthread_mutex_unlock (&m_device_lock);
PBD::MMTIMERS::reset_resolution();
}
void