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/*
Copyright (C) 2001 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 General Public License as published by
the Free Software Foundation; either version 2 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "JackTimedDriver.h"
#include "JackEngineControl.h"
#include "JackTime.h"
#include "JackCompilerDeps.h"
#include <iostream>
#include <unistd.h>
#include <math.h>
namespace Jack
{
int JackTimedDriver::FirstCycle(jack_time_t cur_time_usec)
{
fAnchorTimeUsec = cur_time_usec;
return int((double(fEngineControl->fBufferSize) * 1000000) / double(fEngineControl->fSampleRate));
}
int JackTimedDriver::CurrentCycle(jack_time_t cur_time_usec)
{
return int(((double(fCycleCount) * double(fEngineControl->fBufferSize) * 1000000.) / double(fEngineControl->fSampleRate)) - (cur_time_usec - fAnchorTimeUsec));
}
int JackTimedDriver::Start()
{
fCycleCount = 0;
return JackAudioDriver::Start();
}
void JackTimedDriver::ProcessWait()
{
jack_time_t cur_time_usec = GetMicroSeconds();
int wait_time_usec;
if (fCycleCount++ == 0) {
wait_time_usec = FirstCycle(cur_time_usec);
} else {
wait_time_usec = CurrentCycle(cur_time_usec);
}
if (wait_time_usec < 0) {
NotifyXRun(cur_time_usec, float(cur_time_usec - fBeginDateUst));
fCycleCount = 0;
wait_time_usec = 0;
jack_error("JackTimedDriver::Process XRun = %ld usec", (cur_time_usec - fBeginDateUst));
}
//jack_log("JackTimedDriver::Process wait_time = %d", wait_time_usec);
JackSleep(wait_time_usec);
}
int JackWaiterDriver::ProcessNull()
{
JackDriver::CycleTakeBeginTime();
// Graph processing without Read/Write
if (fEngineControl->fSyncMode) {
ProcessGraphSync();
} else {
ProcessGraphAsync();
}
// Keep end cycle time
JackDriver::CycleTakeEndTime();
ProcessWait();
return 0;
}
} // end of namespace
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