Questions about passing strings and other data from UI to LV2 plugin

Programming applications for making music on Linux.

Moderators: MattKingUSA, khz

Post Reply
f00bar
Established Member
Posts: 83
Joined: Sun May 12, 2013 7:40 pm

Questions about passing strings and other data from UI to LV2 plugin

Post by f00bar »

I need to pass a string from the UI to the plugin. From the eg-sample, it appears that an LV2 atom should be written to a atom port.

If I understand it correctly
  1. Allocate a LV2_Atom_Forge. May that object be on the stack or does it have to survive after the UI event callback has returned?
  2. Call lv2_atom_forge_set_buffer. How do I know the required size of the buffer? Is it the size of the payload (the string), or does it include any headers. The example sets it to 1024 bytes for no reason. May the buffer be allocated on the stack or does it have to survive the UI after the UI event callback has returned?
  3. Add some objects
  4. Write the data to an atom input port
Is that correct?
Post Reply