[LAU] LV2 question

[Tim]

On 4/11/20 4:33 PM, Will Godfrey wrote:
> There is something odd about the way locations are handled in LV2. It shouldn't
> matter which lib location is used, but it seems it does with some hosts.
> 
> I've got into the habit of putting symlinks all over the place to resolve
> this :(
> 
> On Sat, 11 Apr 2020 16:17:03 -0400
> Tim <termtech at rogers.com> wrote:

Hi Will. It's not a path thing, the plugin is just missing the manifest.

On a coding note, MusE allows the user to choose the LV2 paths,
  but since MusE uses lilv_world_load_all(), the only way to inform
  LV2 of these paths is to somewhat awkwardly set the LV2_PATH
  environment variable before calling lilv_world_load_all().
But hey, it works.

Had we used lower-level calls (walk the tree ourselves etc.)
  we might be able to set the paths with the various lower-level
  LV2 function calls.

Tim.

> 
>> Hi. I've been getting errors with this plugin for some time now.
>>
>> lilv_world_load_file(): error: Error loading file
>> `file:///usr/lib64/lv2/gx_colwah.lv2/manifest.ttl'
>>
>> error: failed to open file /usr/lib64/lv2/gx_wah.lv2/gx_colwah.ttl (No
>> such file or directory)
>>
>> It looks like an oversight bug, missing the manifest.
>> See if the author chimes in here...
>>
>> Tim.
>>
>> On 4/11/20 11:58 AM, Jeanette C. wrote:
>>> Hey hey,
>>> I ran into some trouble with LV2 plugins and Ecasound, which uses
>>> liblilv. This was exemplified - in my case - with gx_colwah (from the
>>> guitarix suite). Ecasound tried to load the file manifest.ttl.
>>>
>>> I noticed that gx_colwah.lv2 didn't contain a manifest.ttl, but a
>>> gx_colwah.ttl .
>>>
>>> Would the two fulfill the same function? Is it a more recent part of the
>>> standard to allow/force a file like plugin_name.ttl instead of
>>> manifest.ttl.
>>>
>>> Could all this be an issue within liblilv (0.,24.6 installed here) or
>>> would it be the host application. i.e. Ecasound which enforces that
>>> behaviour?
>>>
>>> Apologies for the probably overcomplicated questions, but my
>>> understanding of the LV2 format is uite limited.
>>>
>>> Best wishes,
>>>
>>> Jeanette
>>>    
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> 
>