27 Oct
2013
27 Oct
'13
8:25 p.m.
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.
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
27 Oct
27 Oct
9:18 p.m.
On Sun, Oct 27, 2013 at 2:25 PM, Aurélien Leblond <blablack(a)gmail.com>wrote;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
9:38 p.m.
On Sun, Oct 27, 2013 at 3:18 PM, Michael Fisher <mfisher31(a)gmail.com> wrote:
On Sun, Oct 27, 2013 at 2:25 PM, Aurélien Leblond <blablack(a)gmail.com>wrote;wrote:
Sorry, I prematurely pressed 'send' on the last message.
continuing on... after forging a frame_time, just write a normal float (no
blank object needed)
m_forge->write_float (1604);
And that should be it. From a technical standpoint, whenever writing to a
sequence you MUST write the time stamp (forge->frame_time
(a_timestamp_value)) before adding the 'next' event.
Your ttl file has atom:Float as the buffer type. I've never used
anything besides atom:Sequence. I imagine this buffer type doesn't need a
sequence head forged first. Maybe David will jump in on how atom:Float
bufferType'd ports are supposed to forged into and out of.
I recommend, if you want to use LVTK to do atom forging, that you subclass
lvtk::AtomForge and add appropriate methods to it...
Here's a snippet that shows how to write patch get/set messages with a
subclassed AtomForge. It also shows how to write raw midi.
http://pastebin.com/C1LYtXpv -- the code in there uses small uses the
nullptr macro. just change those to "0" if you're not using c++11
... and that should be it Plugin-Side.
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);
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
30 Oct
30 Oct
3:56 p.m.
On Sun, 2013-10-27 at 19:25 +0000, Aurélien Leblond 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)
[...]
The port is defined in the TTL as follows:
a lv2:OutputPort, atom:AtomPort ;
atom:bufferType atom:Float ;
This means the port buffer is connected to an atom:Float, i.e. literally
points to ONE LV2_Atom_Float. NOT a sequence, or a vector. Doesn't
sound like that's what you want...
If you're doing anything messagey, Sequence is essentially always what
you want. Anything else would be a value of some fancy Atom type, which
could be theoretically useful, but isn't really supported by anything
right now.
Sorry for the late reply, fell behind on the list. Busy busy...
--
dr
4039
days inactive
4042
days old
linux-audio-dev@lists.linuxaudio.org
3 comments
3 participants
participants (3)
-
Aurélien Leblond -
David Robillard -
Michael Fisher