Re: [Traverso-devel] Traverso LV2 Support

[Stefano D'Angelo]

This seems to be an old bug that I submitted a patch to be fixed some
time ago. Attached to this mail is the patch I developed then, maybe
it can help.

Even better, here
(http://hg.atheme.org/users/daste/freeadsp/users/daste/freeadsp/file/69585319c900/src/lv2.c#l361)
is some code I wrote for handling ports in a LV2 host I never
released, and this handles value bounds quite nicely.

BR,

Stefano

2010/12/17 Jeremy Salwen <address@hidden>:
> Hello Traverso development team,
> I am trying to make sure that an LV2 plugin I'm working on (TalentedHack) is
> working in all the DAWs.  It causes a crash when I load it in Traverso.
>  Now, normally, I'd just expect that I was doing something wrong in my code,
> but it seems like the problem is not really related to the actual plugin
> execution.  It seems to be more of an issue parsing the metadata.  For
> example, here is the stack trace:
> #0  __assert_fail (assertion=0x689728 "slv2_value_is_float(value) ||
> slv2_value_is_int(value)", file=0x6896f0
> "/tmp/traverso-0.49.1/src/3rdparty/slv2/src/value.c", line=315,
> function=0x689830 "slv2_value_as_float") at assert.c:56
> #1  0x0000000000604dfe in slv2_value_as_float (value=<value optimized out>)
> at /tmp/traverso-0.49.1/src/3rdparty/slv2/src/value.c:315
> #2  0x00000000005e086c in LV2ControlPort::get_min_control_value
> (this=0x11e4ee0) at /tmp/traverso-0.49.1/src/plugins/LV2/LV2Plugin.cpp:397
> #3  0x00000000005e3f65 in PluginSlider::PluginSlider (this=0x124c430,
> port=0x11e4ee0) at /tmp/traverso-0.49.1/src/plugins/PluginSlider.cpp:34
> #4  0x00000000005dff44 in PluginPropertiesDialog::PluginPropertiesDialog
> (this=<value optimized out>, parent=<value optimized out>, plugin=<value
> optimized out>) at
> /tmp/traverso-0.49.1/src/plugins/PluginPropertiesDialog.cpp:76
> #5  0x000000000053806c in PluginView::edit_properties (this=0x1244c90) at
> /tmp/traverso-0.49.1/src/sheetcanvas/PluginView.cpp:109
> Just a note: the error is that it expects to get a float "slv2_value" which
> is the minimum value of some port, but instead it gets "null", so it throws
> an error.  Without debugging information, it just does a null pointer
> dereference.
> It seems to be an issue getting the minimum value of an input port.  I'm
> kind of confused, because I checked over the syntax of my ttl files, and
> they seem fine, and ardour2 lv2_jack_host, and lv2file all seem to be able
> to work fine with it.   I should note that all of them will output the line
> "librdf warning - Model does not support contexts" many times, although the
> developer of slv2 said that this is just a bug in librdf which has been
> fixed in later versions.  Traverso will output these lines also, but then at
> some point crashes.
> I'm not sure how stable Traverso's LV2 support is, so I don't know if this
> could be a bug, or definitely an error with my plugin.
> I've attached my two ttl files, if that might help anyone figure out what's
> wrong.
> Thanks for any light you could shed onto this issue.
> Jeremy Salwen
> _______________________________________________
> Traverso-devel mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/traverso-devel
>
>

traverso-bounds.patch
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