Re: [LAD] [ANN] guitarix-0.04.4-1 release

Am Samstag, den 23.05.2009, 05:04 -0700 schrieb warjamy@email-addr-hidden:
> discussion started at LAD about changing the jack server latency from the app called guitarix (like ardour does from its menu JACK -> Latency). Proposed guitarix patch (by me) works nice against jack2 but not against jack1. See below.
>
> Hermann,
>
> I quickly ran guitarix in debug mode through gdb. You get a crash at dsp_audio.cpp, line 469. Looks like memory at output[2] and output[3] cannot be accessed. I tried to understand what you attempt to do but this function (mydsp::compute) is way to much for me to understand. It looks like some sort of auto-code ...
>
> Anyway, output[2] and output[3] are passed in from process() (process callback function). I believe these arrays should correspond to buffers that you receive from jack audio ports 2 and 3. However, at the time we try to change the latency, they are already unregistered because of DSP.setNumOutputs().
>
> So it looks to me that resetting the jack buffer size on the fly from guitarix badly interacts with how jack1 handled your port deregistration requests. I don't know why it works with jack2. Running guitarix through gdb against jack2, I could see that output[2] and output[3] were still valid memory locations after changing the jack buffer size on the fly.
>
> This is a bit unfortunate that we get different behaviors when using jack1 or jack2. I hope you'll sort it out, I don't have more time to spend on it.
>
> J.
>
Morning James

So I got it working. Your Code is submit to SVN with some little
additions. Thanks James, that is the "first direct code contribution"
the guitarix projekt recive, I hope more will follow. :D
 

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Received on Sun May 24 12:15:01 2009