JackEngineControl.cpp
/*
Copyright (C) 2003 Paul Davis
Copyright (C) 2004-2008 Grame
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "JackClientInterface.h"
#include "JackEngineControl.h"
#include "JackGraphManager.h"
#include "JackClientControl.h"
#include <algorithm>
#include <math.h>
namespace Jack
{
static inline jack_time_t JACK_MAX(jack_time_t a, jack_time_t b)
{
return (a < b) ? b : a;
}
void JackEngineControl::CalcCPULoad(JackClientInterface** table,
JackGraphManager* manager,
jack_time_t cur_cycle_begin,
jack_time_t prev_cycle_end)
{
fPrevCycleTime = fCurCycleTime;
fCurCycleTime = cur_cycle_begin;
jack_time_t last_cycle_end = prev_cycle_end;
// In Asynchronous mode, last cycle end is the max of client end dates
if (!fSyncMode) {
for (int i = fDriverNum; i < CLIENT_NUM; i++) {
JackClientInterface* client = table[i];
JackClientTiming* timing = manager->GetClientTiming(i);
if (client && client->GetClientControl()->fActive && timing->fStatus == Finished) {
last_cycle_end = JACK_MAX(last_cycle_end, timing->fFinishedAt);
}
}
}
// Store the execution time for later averaging
if (last_cycle_end > 0) {
fRollingClientUsecs[fRollingClientUsecsIndex++] = last_cycle_end - fPrevCycleTime;
}
if (fRollingClientUsecsIndex >= JACK_ENGINE_ROLLING_COUNT) {
fRollingClientUsecsIndex = 0;
}
// Each time we have a full set of iterations, recompute the current
// usage from the latest JACK_ENGINE_ROLLING_COUNT client entries.
if (fRollingClientUsecsCnt && (fRollingClientUsecsIndex == 0)) {
jack_time_t avg_usecs = 0;
jack_time_t max_usecs = 0;
for (int i = 0; i < JACK_ENGINE_ROLLING_COUNT; i++) {
avg_usecs += fRollingClientUsecs[i]; // This is really a running total to be averaged later
max_usecs = JACK_MAX(fRollingClientUsecs[i], max_usecs);
}
fMaxUsecs = JACK_MAX(fMaxUsecs, max_usecs);
if (max_usecs < ((fPeriodUsecs * 95) / 100)) {
// Average the values from our JACK_ENGINE_ROLLING_COUNT array
fSpareUsecs = (jack_time_t)(fPeriodUsecs - (avg_usecs / JACK_ENGINE_ROLLING_COUNT));
} else {
// Use the 'worst case' value (or zero if we exceeded 'fPeriodUsecs')
fSpareUsecs = jack_time_t((max_usecs < fPeriodUsecs) ? fPeriodUsecs - max_usecs : 0);
}
fCPULoad = ((1.f - (float(fSpareUsecs) / float(fPeriodUsecs))) * 50.f + (fCPULoad * 0.5f));
}
fRollingClientUsecsCnt++;
}
void JackEngineControl::ResetRollingUsecs()
{
memset(fRollingClientUsecs, 0, sizeof(fRollingClientUsecs));
fRollingClientUsecsIndex = 0;
fRollingClientUsecsCnt = 0;
fSpareUsecs = 0;
fRollingInterval = int(floor((JACK_ENGINE_ROLLING_INTERVAL * 1000.f) / fPeriodUsecs));
}
void JackEngineControl::NotifyXRun(jack_time_t callback_usecs, float delayed_usecs)
{
ResetFrameTime(callback_usecs);
fXrunDelayedUsecs = delayed_usecs;
if (delayed_usecs > fMaxDelayedUsecs) {
fMaxDelayedUsecs = delayed_usecs;
}
}
} // end of namespace
Jack
Definition: JackAC3Encoder.cpp:30