ardour/livetrax
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dummy: ignore first cycle timing.

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This commit is contained in:
Robin Gareus 2015-05-01 15:58:17 +02:00
parent e418b0866e
commit 2f432c3be7
1 changed files with 10 additions and 10 deletions
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20
libs/backends/dummy/dummy_audiobackend.cc
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@ -1174,7 +1174,7 @@ DummyAudioBackend::main_process_thread ()
manager.graph_order_callback();
int64_t clock1, clock2;
clock1 = _x_get_monotonic_usec();
clock1 = -1;
while (_running) {
if (_freewheeling != _freewheel) {
@ -1226,8 +1226,8 @@ DummyAudioBackend::main_process_thread ()
if (!_freewheel) {
const int64_t nominal_time = 1e6 * _samples_per_period / _samplerate;
clock2 = _x_get_monotonic_usec();
#ifdef PLATFORM_WINDOWS
bool win_timers_ok = true;
bool 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
@ -1235,14 +1235,14 @@ DummyAudioBackend::main_process_thread ()
* execution switches cores.
*/
if (clock1 < 0 || clock2 < 0 || (clock1 > clock2) || (clock2 - clock1) > 4 * nominal_time) {
clock2 = clock1 = 0;
win_timers_ok = false;
clock1 = 0;
clock2 = nominal_time;
timers_ok = false;
}
#endif
const int64_t elapsed_time = clock2 - clock1;
#ifdef PLATFORM_WINDOWS
if (win_timers_ok)
#endif
if (timers_ok)
{ // low pass filter
const float load = elapsed_time / (float) nominal_time;
if (load > _dsp_load) {
@ -1263,7 +1263,7 @@ DummyAudioBackend::main_process_thread ()
Glib::usleep (100); // don't hog cpu
}
/* beginning of netx cycle */
/* beginning of next cycle */
clock1 = _x_get_monotonic_usec();
bool connections_changed = false;