linuxaudio.org

On Sun, 2010-07-04 at 23:35 +0200, fons@kokkinizita.net wrote:
> Well, at least those sound cards that provide both audio and midi

quoted text
> *could* do this - timestamp incoming midi and provide that info

> in some way, and requiring similar time stamps for outgoing midi.

Could do it even with separate midi and audio cards, as long as the midi

RX ISR can somehow grab a timestamp from the audio card driver (in an

interrupt context), and as long as the midi RX ISR is getting serviced

with negligible latency (Otherwise you need to timestamp in hardware). 
In reality is is probably only practical in an embedded context where

you have total control over the hardware. 
Note that even with this you will have some jitter due to the way a UART

typically over samples to get the centre location of each bit (But at

midi rates this should only be measured in tens of microseconds). 
MIDI on general purpose hardware with a general purpose OS is hard to

get really right. 
Regards, Dan.
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