Hello, Joe White white.joe4@gmail.com wrote:
Hi Lumis,
Thanks for the feedback! We're actually looking at using an alternative documentation system which should hopefully make it a lot easier to find the info you need. Totally agree the burger menu can be a bit non-intuitive, writing web sites ain't as fun as DSP :(
Dead simple idea: a button group on top of the page in place of the burger might be a good start... Just a quick idea :) I understand the frustration!
I don't personally have any experience with MIPS platforms, do you have a board you try it out on? Can support as much as possible.
Again I haven't tested much yet. I can name a few:
- RT5350F-Olinuxino by Olimex (https://www.olimex.com/Products/OLinuXino/RT5350F/RT5350F-OLinuXino/), I own one, but audio output without USB is not easy at all.
- LinkIt Smart 7688 + Breakout by MediaTek&Seeed (http://www.seeedstudio.com/depot/Breakout-for-LinkIt-Smart-7688-v20-p-2641.h...) Much better candidate as it has integrated audio on the breakout. Purchasing one as soon as it's available! Also more powerful than RT5350F.
The first thing I should do is to try to compile a simple patch on this platform. Speaking about test patches, what would you suggest as a heavy-load stress test patch for a platform? Something that one could tune to see how far the DSP processing power of the CPU can be pushed.
Some background info: the reason I'm interested in these boards is that a lot exist in the price range of a good arduino board ($10-30), provide a minimal linux, a very active community through OpenWRT, advanced networking (usually have wifi, sometimes 2 wifi, often ethernet, sometimes several ethernet ports!) that might help a lot in the case of networked audio/performance/installations. It is not in any case a replacement for either an Arduino or a full computer running "standard" Debian/Ubuntu linux, it sits at the median point between a bare metal C-programmed microcontroller and a systemd-controlled freshly released Ubuntu version.
Thanks, Joe
On 15 May 2016 at 15:48, Lumis Xulepth lumis@xulepth.fr wrote:
Hi Joe, hi list
On 2016-05-15 15:06, Joe White wrote:
Hi Chuckk,
I'm one of the developers of heavy. Apologies that you felt some information was lacking, would be very interested in hearing more about your experience and what wasn't answered.
I don't know what Chuckk's comments precisely are, I just found myself several times looking for the documentation. Maybe the hamburger on the top right isn't obvious for everyone? Again, I still haven't used it on a specific platform but I think that once logged in and having compiled a few patches, navigation is easier. I like to be able to switch implementations (C/Unity/Vst etc...) documentation easily! :)
The code that heavy generates should compile on any platform that has a C99 compiler, and if it didn't we'd be very interested in looking into why. There are no OS specific dependencies and you can even swap out your own malloc, math, etc.. implementations.
To your knowledge, has there been usecases or tests of Heavy on MIPS platform? Recently I've been thinking about using OpenWRT boards (most are MIPS32), generally CPU is 300-600MHz with minimal linux running on it for realtime audio.
Thanks for your answers.
Lumis/Fergus
The code is optimised for SSE, AVX and NEON instruction sets and we also provide a single sample option for platforms where they are not available (i.e. javascript)
Here's an example of integration with portaudio https://github.com/enzienaudio/examples/tree/master/portaudio [3]
Thanks, Joe
On 13 May 2016 at 23:22, Chuckk Hubbard badmuthahubbard@gmail.com wrote:
Apropos of the heavy compiler, I was reading up on it and simply
moved on because of what seems to me a lack of information. There was an allusion to it working for a wide variety of platforms and so on, but no actual lists of this supposedly wide variety. Does someone have an idea if it could compile Pd patches to work without an OS for some architecture? Otherwise, why would you bother with it? (that's not a rhetorical question) Thanks. -Chuckk
On Mon, May 9, 2016 at 6:39 PM, cyrille henry ch@chnry.net wrote: hello,
I recently send a mail in this list describing my experience of audio synthesis on microcontroler, but i did not use libpd.
i did not recommend libpd for microcontrolers.
in fact, I did not recommend audio processing on hardware that did not have support for float arithmetic. (only me or crazy nerd do that).
a micro controller to use is for example the cortex M4. You can find them on the teensy hardware. teensy also provide a audio synthesis library, and is supported by arduino IDE.
You can also have a look at the heavy compiler if you want to embedded a pd patch.
Cyrille
Le 09/05/2016 17:01, Christof Ressi a écrit : Hi,
has anyone experience in using LibPd on a microcontroller? I wanna try to run some rather basic DSP code on this guy here:
https://www.olimex.com/Products/IoT/MOD-WIFI-ESP8266-DEV/open-source-hardwar...
[1] There are some existing Arduino/C++ frameworks and I thought I could either write my own small DSP library in C++ or use LibPd.
I understood that LibPd is completely independed of audio drivers and external libraries and since it's plain C code it should work on everything that can run code. However, I have only encountered LibPd in the context of other applications (processing, openFrameworks) and mobile devices so far. Do you think it could work on an ESP8266? I'm also a bit concerned about efficiency, as computation power is rather limited:
"ESP8266EX is embedded with Tensilica L106 32-bit micro controller (MCU), which features extra low power consumption and 16-bit RSIC. The CPU clock speed is 80MHz. It can also reach a maximum value of 160MHz. Real Time Operation System (RTOS) is enabled. Currently, only 20% of MIPS has been occupied by the WiFi stack, the rest can all be used for user application programming and development."
Christof
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