OSC question: lists
| Date | 2017-02-25 19:45 |
| From | Dave Seidel |
| Subject | OSC question: lists |
Still an OSC newbie here -- I need to write some code to consume OSC from a collaborator. He will be sending a series a numeric values each of which corresponds to a cell in a grid. He can send individual messages (one per cell) or he can send a list of all the values each time the grid changes. Getting a list seems a lot more efficient, but I'm not clear on how to use OSClisten to consume a list of integers. Can someone help?
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I may decide to consume the OSC in Python, in which case I would use channels to send the data to an embedded Csound instance. In this scenario, how would I send a list of values to a Csound channel, hopefully in an atomic operation? |
| Date | 2017-02-25 19:58 |
| From | Guillermo Senna |
| Subject | Re: OSC question: lists |
Hi,
Does your collaborator have access to the OSC implementation on his
side? Because if he can tweak his code he probably can send you a Blob
and you'd receive it as an array in Csound. What he'll need to do is
bitshift two ints into a double. I'm doing that currently and it seems
to work fine.
On 25/02/17 16:45, Dave Seidel wrote:
> Still an OSC newbie here -- I need to write some code to consume OSC from a
> collaborator. He will be sending a series a numeric values each of which
> corresponds to a cell in a grid. He can send individual messages (one per
> cell) or he can send a list of all the values each time the grid changes.
> Getting a list seems a lot more efficient, but I'm not clear on how to use
> OSClisten to consume a list of integers. Can someone help?
>
> I may decide to consume the OSC in Python, in which case I would use
> channels to send the data to an embedded Csound instance. In this scenario,
> how would I send a list of values to a Csound channel, hopefully in an
> atomic operation?
>
> - Dave
>
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Discussions of bugs and features can be posted here |
| Date | 2017-02-25 20:07 |
| From | Dave Seidel |
| Subject | Re: OSC question: lists |
Thanks, Guillermo, good question. Not sure how much flexibility he has. He's using Max (he uses it for visuals, with Jitter). I will ask. On Sat, Feb 25, 2017 at 2:58 PM, Guillermo Senna <gsenna@gmail.com> wrote: Hi, |
| Date | 2017-02-26 10:30 |
| From | Richard |
| Subject | Re: OSC question: lists |
|
Expanding a bit on the Csound example. Say you have a 16 by 16 matrix, you would need to read 16 'rows' of 16 integers like shown below: (This shows only one row, you'd have to implement this 16 times...) It also depends on the destination addresses (in this case: 'row1') you get from the client. Maybe he also has an address for when one particular cell has changed - that would be more economic of course... Richard sr = 44100 ksmps = 100 nchnls = 2 gihandle OSCinit 7770 instr 1 kf1 init 0 kf2 init 0 nxtmsg: kk OSClisten gihandle, "row1", "iiiiiiiiiiiiiiii", kr11,kr12,kr13,kr14,kr15 ..., kr116 if (kk == 0) goto ex printk 0,kr11 printk 0,kr12 ... kgoto nxtmsg ex: endin On 25/02/17 20:45, Dave Seidel wrote:
|
| Date | 2017-02-26 10:45 |
| From | Richard |
| Subject | Re: OSC question: lists |
|
typo correction for clarity.. On 26/02/17 11:30, Richard wrote:
|
| Date | 2017-02-26 17:11 |
| From | Dave Seidel |
| Subject | Re: OSC question: lists |
Thanks, Richard. As it turns out, he will be sending the entire set of values all at once, as a single list. I don't necessarily need to know row/col, but if I want to I can compute it easily enough by position in the list. The data will be changing frequently. The idea is that he will be scanning a large large roll of paper which will be slowly scrolling under a camera. The paper will be strewn with ashes and maybe other materials. His code takes the scrolling image, analyzes it as a grid, and sends greyscale values for each cell. The idea is to treat the scroll of ashes as a "score". I would prefer to consume the OSC data in Python (using one of the Python OSC packages) so that I can more easily manipulate/transform it before sending it to Csound via the API (will probably use ctcsound). But I would still like to know what my options are, especially for efficient transmittal of potentially large datasets to Csound using the API. Can this be done using a channel? Would it be better to populate an array or table that Csound can use in orchestra code? I may decide to send score events only from the Python layer, in which case everything is a lot easier. But I am investigating what is possible. On Sun, Feb 26, 2017 at 5:45 AM, Richard <zappfinger@gmail.com> wrote:
|
| Date | 2017-02-26 18:09 |
| From | Richard |
| Subject | Re: OSC question: lists |
|
Is he sending it as an OSC blob (Binary large object) or as
traditional OSC integers? Richard On 26/02/17 18:11, Dave Seidel wrote:
|
| Date | 2017-02-26 18:19 |
| From | Dave Seidel |
| Subject | Re: OSC question: lists |
Looks like it will be a series of integers rather than a blob, so Csound could handle it, but it will be nice to have numpy available to manipulate the date. I am starting to lean toward the idea of having Python send only score events to Csound for simplicity, and to keep all the state in the Python layer. (By the way, this is or a realtime piece with video and performance aspects as well as sound. Someone will be actually turning a crank of some sort to scroll the "score" of ashes that will govern the sound.) On Sun, Feb 26, 2017 at 1:09 PM, Richard <zappfinger@gmail.com> wrote:
|