sequencer buffer

[Bernhard Gerlach <gerlacbd@emt.iis.fhg.de>]

Hello NG,

again I've got a question regarding the ALSA midi sequencer. I tried to 
generate Midi time code. For that, I allocated a queue, started it and 
then filled it up with a couple of midi quarter frame messages. Each 
messages had got a timestamp containing the (real/absolute) time, at 
which the message should be sent by the queue. After filling the queue, 
I drained the buffer and tried to let the process sleep until 
snd_seq_event_output_pending( handle ) falls below a given value (I 
tried 500). But I realized, that the buffer size is never decremented, 
even if the queue outputs events.

The first 7 seconds of output seem to be ok (I control the output on a 
harddisk recorder which just reads the incoming midi time code and 
displays it). But then I get "Resource temporarily unavailable" errors 
when enqueueing another quarter frame event. I think, thats because the 
output buffer is full. But why isn't an event extracted from buffer when 
it is sent by a queue?

Thanks for answers,

Bernhard

-- 

---------------------------------
Bernhard Gerlach
Fraunhofer AEMT
Am Helmholtzring 1 (Haus M)
98693 Ilmenau
Germany

mail: gerlacbd@emt.iis.fhg.de
---------------------------------



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