[CM] Fwd: Linux/Midi Test

[lieven moors]

Kjetil S. Matheussen wrote:
>
>
> On Tue, 11 Aug 2009, lieven moors wrote:
>
>> I think I might know what the problem is with Juce. I had a look at the
>> Juce code myself,
>> and it looks like sendMessageNow() is not calling the
>> snd_seq_drain_output().
>
> For what its worth, the one time I've written code which sends
> midi via alsa, the code calls snd_seq_drain_output as last
> operation. I don't remember what I did back then, but this
> could definitely be the problem. It sounds likely, at least.
>
>
> static void alsaseq_PutMidi(
>                 struct MidiLink *midilink,
>                 uint32_t msg
>                 )
> {
>   unsigned int d3=(msg>>8)&0xff;
>   unsigned int d2=(msg>>16)&0xff;
>   unsigned int d1=(msg>>24)&0xff;
>
>   unsigned char buffer[3]={d1,d2,d3};
>   snd_seq_event_t ev;
>   snd_midi_event_t *midi_ev;
>   snd_midi_event_new( 10, &midi_ev );
>
>   snd_seq_ev_clear( &ev );
>   snd_midi_event_encode(midi_ev,
>             buffer,
>             3,
>             &ev);
>   snd_midi_event_free( midi_ev );
>
>   snd_seq_ev_set_source(&ev,midilink->port);
>   snd_seq_ev_set_subs(&ev);
>
>   snd_seq_ev_schedule_tick( &ev, radium_queue, 1, 1);
>
>   snd_seq_event_output(radium_seq, &ev);
>
>   snd_seq_drain_output(radium_seq);
>
> }
>
>
But the code in Juce calls snd_seq_event_output_direct() instead of 
snd_seq_event_output()
and doesn't call snd_seq_drain_output().
I've tried replacing

snd_seq_event_output_direct()

with

    snd_seq_event_output()
    snd_seq_drain_output()

but timing still doesn't sound right. I can't say for sure if it sounds 
different

So it is not that simple. But I think there is a problem with how the 
buffers are used.