On Sun, Oct 27, 2013 at 2:25 PM, Aurélien Leblond <blablack@gmail.com> wrote:

Hi everyone,

In my lv2 plugin, I need to communicate information from the DSP to
the UI, but I don't want to break the DSP/UI separation principle (no
Instance or Data access). On top of that, I'm using LVTK.

The type of data I'm trying to move is a Vector of Float (buffer type
Sound in the ttl) - but even basic information on how to transfer a
Float from the DSP to the UI would be valuable.

he, he, yeah it can get a little confusing... maybe this will help.

// you're sending things in an atom sequence so get the size information

// from the port buffer

LV2_Atom_Sequence* aseq = (LV2_Atom_Sequence*) p (p_notify);

m_forge->set_buffer ((uint8_t*) aseq, aseq->atom.size);

m_forge->sequence_head (m_notify_frame, 0);

// sequences need a timestamp for each event added

m_forge->frame_time (0);

m_forge->write_float (1604); //test data i'm trying to move

In my UI, I just want to see if I receive this data
In the port_event method, at the moment the only thing I'm doing is:
std::cout << port << " - " << format << std::endl;

The port is defined in the TTL as follows:
a lv2:OutputPort, atom:AtomPort ;
atom:bufferType atom:Float ;
atom:supports <http://lv2plug.in/ns/ext/patch#Message> ;
lv2:index 1 ;
lv2:symbol "notify" ;
lv2:name "Notify" ;

What I have do so far in the DSP (run method)
m_forge->set_buffer((uint8_t*)p(p_notify), sizeof(float));
//p_notify being the atom port
m_forge->sequence_head(m_notify_frame, 0);

ForgeFrame p_frame;
Atom p_msg = m_forge->write_blank(p_frame, 1, urids.atom_Float);
m_forge->property_head(urids.atom_value, 0);
m_forge->write_float(1604); //test data i'm trying to move
m_forge->pop(p_frame);

In my UI, I just want to see if I receive this data
In the port_event method, at the moment the only thing I'm doing is:
std::cout << port << " - " << format << std::endl;

The port is defined in the TTL as follows:
a lv2:OutputPort, atom:AtomPort ;
atom:bufferType atom:Float ;
atom:supports <http://lv2plug.in/ns/ext/patch#Message> ;
lv2:index 1 ;
lv2:symbol "notify" ;
lv2:name "Notify" ;

At the moment, the code compiles and runs without crashing (yeah!),
but nothing happens (boo!).
Would you guys have any ideas?

Thanks in advance,
Aurélien