[linux-audio-dev] Realtime problems with midi/osc sequencer

[Christian]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

> I'd suggest using clock_nanosleep() and clock_gettime() with
> clockid=CLOCK_MONOTONIC.
> This is the "more right" approach than select/gettimeofday().
> 
> 
> Dmitry.

Yeah clock_nanosleep did it!
I got a stable absolute bpm exact midi clock.
I'll test the osc messages tomorrow( I've to rewrite some stuff of my
first sequencer ).
Whooo, thanks alot.
Christian

p.s.:
The Code:
[CODE]
void Timer::runThread()
{
	std::list<Seq>::iterator iter;
	timespec timeOut;
	int shortTickCount=0;
	int longTickCount=0;
	int midiTickCount=0;
	
	struct sched_param rtparam;
	memset (&rtparam, 0, sizeof (rtparam));
	rtparam.sched_priority = 99;
	pthread_setschedparam (thread, SCHED_FIFO, &rtparam);
	
	while( !bRunning )
		usleep ( 100 );
	
	clock_gettime( CLOCK_MONOTONIC, &timeOut );
	
	for( iter=seqs.begin(); iter!=seqs.end(); iter++ )
	{
		lo_send_timestamped( iter->address, LO_TT_IMMEDIATE, "/timer/tick",
"iii", iTact, iShortTick, iLongTick );
	}
	
	while( !bQuit )
	{
		if( shortTickCount == 3 )
		{
			iShortTick++;
			shortTickCount=0;
			if( iShortTick == 256 )
			{			
				iShortTick=0;
				iLongTick=0;
				iTact++;
			}
			for( iter=seqs.begin(); iter!=seqs.end(); iter++ )
			{
				lo_send_timestamped( iter->address, LO_TT_IMMEDIATE, "/timer/tick",
"iii", iTact, iShortTick, iLongTick );
			}
		}
		
		if( longTickCount == 4 )
		{
			longTickCount=0;
			iLongTick++;
		}
		
		if( midiTickCount == 8 )
		{
			midiTickCount=0;
  			midiOut->sendMessage( &midiMsg );
		}
		
		shortTickCount++;
		longTickCount++;
		midiTickCount++;
		
		timeOut.tv_nsec+=iTick*1000;
		if( timeOut.tv_nsec >1000000000 )
		{
			timeOut.tv_sec++;
			timeOut.tv_nsec=timeOut.tv_nsec-1000000000;
		}
		
		clock_nanosleep( CLOCK_MONOTONIC, TIMER_ABSTIME, &timeOut, NULL );
	}
	pthread_exit( 0 );
}
[/CODE]
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.6 (GNU/Linux)
Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org

iD8DBQFF8x9oVC26eJ+o0+0RAr5gAJ9/a/UMEIKzlA3ZKXhPhEidXs4FGgCgopIC
am0HTYe66SLHV0o9e/hE4oM=
=1owC
-----END PGP SIGNATURE-----