Re: [LAD] LV2: Communicate from the DSP to the UI

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To: Linux Audio Developers <linux-audio-dev@...>, <devel@...>
Date: Sunday, October 27, 2013 - 8:18 pm

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On Sun, Oct 27, 2013 at 2:25 PM, Aur=E9lien Leblond wro=
te:

> Hi everyone,

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 informatio=
n
// from the port buffer

LV2_Atom_Sequence* aseq =3D (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 ;
lv2:index 1 ;
lv2:symbol "notify" ;
lv2:name "Notify" ;

> What I have do so far in the DSP (run method)

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=
On Sun, Oct 27, 2013 at 2:25 PM, Aur=E9lien Leblond <<=
a href=3D"mailto:blablack@gmail.com" target=3D"_blank">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=
.=A0=A0 =A0 // you're sending things in an atom s=
equence so get the size information
=A0 =A0 // from the port buffer=A0 =A0 LV2_A=
tom_Sequence* aseq =3D (LV2_Atom_Sequence*) p (p_notify);=A0 =A0=
m_forge->set_buffer ((uint8_t*) aseq, aseq->atom.size);=A0 =A0 m_forge->sequence_head (m_notify_frame, 0);
=A0 =A0 // sequences need a timestamp for each event added=
=A0 =A0 m_forge->frame_time (0);=A0 =A0 m_forge->write_float (1604); //test data i'm trying to move=

In my UI, I just want to see if I receive this dataIn the port_even=
t method, at the moment the only thing I'm doing is:=A0 =A0 std::co=
ut << port << " - " << format << std::end=
l;
The port is defined in the TTL as follows:=A0 =A0 a lv2:Out=
putPort, atom:AtomPort ;=A0 =A0 atom:bufferType atom:Float ;=A0 =A0=
atom:supports <http://lv2plug.in/ns/ext/patch#Message> ;
=A0 =A0 lv2:index 1 ;=A0 =A0 lv2:symbol "notify" ;=A0 =A0=
lv2:name "Notify" ;=

What I have do so far in the DSP (run method)
=A0 =A0 m_forge->set_buffer((uint8_t*)p(p_notify), sizeof(float));
//p_notify being the atom port
=A0 =A0 m_forge->sequence_head(m_notify_frame, 0);

=A0 =A0 ForgeFrame p_frame;
=A0 =A0 Atom p_msg =3D m_forge->write_blank(p_frame, 1, urids.atom_Float=
);
=A0 =A0 m_forge->property_head(urids.atom_value, 0);
=A0 =A0 m_forge->write_float(1604); //test data i'm trying to move
=A0 =A0 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:
=A0 =A0 std::cout << port << " - " << format &l=
t;< std::endl;

The port is defined in the TTL as follows:
=A0 =A0 a lv2:OutputPort, atom:AtomPort ;
=A0 =A0 atom:bufferType atom:Float ;
=A0 =A0 atom:supports <http://lv2plug.in/ns/ext/patch#Message> ;
=A0 =A0 lv2:index 1 ;
=A0 =A0 lv2:symbol "notify" ;
=A0 =A0 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,
Aur=E9lien

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Messages in current thread:
[LAD] LV2: Communicate from the DSP to the UI, Aurélien Leblond, (Sun Oct 27, 7:25 pm)
Re: [LAD] LV2: Communicate from the DSP to the UI, David Robillard, (Wed Oct 30, 2:56 pm)
Re: [LAD] LV2: Communicate from the DSP to the UI, Michael Fisher, (Sun Oct 27, 8:18 pm)
Re: [LAD] LV2: Communicate from the DSP to the UI, Michael Fisher, (Sun Oct 27, 8:38 pm)