Re: [midishare-devel] Soft-synth on Mac OS X

[<le...@gr...>]

Le 24 juin 05 =E0 20:25, Edwin Vane a =E9crit :

> Hi,
>
> I was hoping somebody close to midishare internals could quickly =20
> answer
> this question for me instead of me searching through the code. What is
> used as the software synth in Mac OS X in MidiShare? Is it the =20
> QuickTime
> synth or CoreMidi?

The MidiShare driver msQTDriver still uses the QTMA architecture, but =20=

we did not see hight latencies as you seems to have.
How do you measure this 100ms latency value?

>
> Via my experiments with QTMA in QuickTime (before I
> discovered QTMA was deprecatd), I discovered that QTMA in QuickTime is
> quite laggy (about 100ms in experiments). I ended up writing a new =20
> media
> handler that uses CoreMidi instead. However, when trying to play
> QuickTime movies with my new handler, playback can sound ever so
> slightly 'uneven' since movie players usually tell media players to =20=

> play
> every 20 ms or so.


Do you mean you're playing a MIDIFile with your new handler?

> I was hoping that MidiShare could solve my
> 'unevenness' problem with some better scheduling than what I naively
> implemented. However, it's not going to help unless MidiShare doesn't
> use QTMA internally for software synthesis.

MidiShare as a 1 millisecond timing resolution.

Stephane Letz=