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another hack for windows timers, DSP load calculation

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This commit is contained in:
Robin Gareus 2014-11-07 12:17:15 +01:00
parent 7670e463cc
commit 159cb4d2f9
1 changed files with 13 additions and 4 deletions
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17
libs/backends/dummy/dummy_audiobackend.cc
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@ -1167,17 +1167,24 @@ DummyAudioBackend::main_process_thread ()
}
if (!_freewheeling) {
const int64_t nomial_time = 1e6 * _samples_per_period / _samplerate;
clock2 = _x_get_monotonic_usec();
#ifdef PLATFORM_WINDOWS
// querying the performance counter can fail occasionally
if (clock1 < 0 || clock2 < 0) {
bool win_timers_ok = true;
/* querying the performance counter can fail occasionally (-1).
* Also on some multi-core systems, timers are CPU specific and not
* synchronized. We assume they differ more than a few milliseconds
* (4 * nominal cycle time) and simply ignore cases where the
* execution switches cores.
*/
if (clock1 < 0 || clock2 < 0 || (clock1 > clock2) || (clock2 - clock1) > 4 * nomial_time) {
clock2 = clock1 = 0;
win_timers_ok = false;
}
#endif
const int64_t elapsed_time = clock2 - clock1;
const int64_t nomial_time = 1e6 * _samples_per_period / _samplerate;
#ifdef PLATFORM_WINDOWS
if (clock1 >= 0 && clock2 >= 0)
if (win_timers_ok)
#endif
{ // low pass filter
_dsp_load = _dsp_load + .05 * ((elapsed_time / (float) nomial_time) - _dsp_load) + 1e-12;
@ -1192,6 +1199,8 @@ DummyAudioBackend::main_process_thread ()
_dsp_load = 1.0f;
Glib::usleep (100); // don't hog cpu
}
/* beginning of netx cycle */
clock1 = _x_get_monotonic_usec();
bool connections_changed = false;