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fix Dummy DSP load on win32 & low-pass filter load

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g_get_monotonic_time() has millisecond granularity,
use performance Counter if available
This commit is contained in:
Robin Gareus 2014-10-31 22:51:47 +01:00
parent f02610b47c
commit 8d4cbc4cc1
1 changed files with 29 additions and 4 deletions
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33
libs/backends/dummy/dummy_audiobackend.cc
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@ -37,6 +37,23 @@ size_t DummyAudioBackend::_max_buffer_size = 8192;
std::vector<std::string> DummyAudioBackend::_midi_options;
std::vector<AudioBackend::DeviceStatus> DummyAudioBackend::_device_status;
#ifdef PLATFORM_WINDOWS
static double _win_pc_rate = 0; // usec per tick
#endif
static int64_t _x_get_monotonic_usec() {
#ifdef PLATFORM_WINDOWS
if (_win_pc_rate > 0) {
LARGE_INTEGER Count;
// not very reliable, but the only realistic way for sub milli-seconds
if (QueryPerformanceCounter (&Count)) {
return (int64_t) (Count.QuadPart * _win_pc_rate);
}
}
#endif
return g_get_monotonic_time();
}
DummyAudioBackend::DummyAudioBackend (AudioEngine& e, AudioBackendInfo& info)
: AudioBackend (e, info)
, _running (false)
@ -1122,7 +1139,7 @@ DummyAudioBackend::main_process_thread ()
manager.graph_order_callback();
uint64_t clock1, clock2;
clock1 = g_get_monotonic_time();
clock1 = _x_get_monotonic_usec();
while (_running) {
// re-set input buffers, generate on demand.
@ -1149,10 +1166,10 @@ DummyAudioBackend::main_process_thread ()
}
if (!_freewheeling) {
clock2 = g_get_monotonic_time();
clock2 = _x_get_monotonic_usec();
const int64_t elapsed_time = clock2 - clock1;
const int64_t nomial_time = 1e6 * _samples_per_period / _samplerate;
_dsp_load = elapsed_time / (float) nomial_time;
_dsp_load = _dsp_load + .05 * ((elapsed_time / (float) nomial_time) - _dsp_load) + 1e-12;
if (elapsed_time < nomial_time) {
Glib::usleep (nomial_time - elapsed_time);
} else {
@ -1162,7 +1179,7 @@ DummyAudioBackend::main_process_thread ()
_dsp_load = 1.0f;
Glib::usleep (100); // don't hog cpu
}
clock1 = g_get_monotonic_time();
clock1 = _x_get_monotonic_usec();
bool connections_changed = false;
bool ports_changed = false;
@ -1231,6 +1248,14 @@ static int
instantiate (const std::string& arg1, const std::string& /* arg2 */)
{
s_instance_name = arg1;
#ifdef PLATFORM_WINDOWS
LARGE_INTEGER Frequency;
if (!QueryPerformanceFrequency(&Frequency) || Frequency.QuadPart < 1) {
_win_pc_rate = 0;
} else {
_win_pc_rate = 1000000.0 / Frequency.QuadPart;
}
#endif
return 0;
}