[fluid-dev] R: Re: How to change settings (Reverb, Chorus, Gain, Bank) while Fluidsynth is running as a server (no shell)?

[address@hidden]

Hello, thanks a lot for your support!

>The first thing that comes to mind, without having to do any programming,
>is 
to use the built in FluidSynth TCP/IP server (a command line switch
>enables this).

My board has no network, but I 
could use the internal localhost: fluidsynth tcp server would listen on 
127.0.0.1 and my script, running locally, could 
use netcat to talk to the appropriate port. A dummy network, that is.
But, I did not find any documentation about 
fluidsynth tcp server: nothing in the man page, nothing in the html document. :(
So I don't know about commands, 
message formats, settings, etc. :(

I was hoping that, for example (libfluidsynth doc):

  fluid_settings_setstr
(settings, "some_parameter", "some_value");

could apply to an existing (running) synth, without having to do

 synth = 
new_fluid_synth(settings);

But it seems that there's nothing like a synth = open_running_fluid_synth()  :-(

>Nice to 
hear about your results with the ARM platform you are using.  I've
>been wanting to create a stand alone FluidSynth 
device for a while myself.
>It's great that embedded systems have reached a high enough level, power
>wise, to work as 
well as you are reporting and with floating point units to
>make this possible.

Yes, these new dev boards are really 
powerful.
The one I'm using has a Allwinner A20 (dual-CortexA7 @ 900MHz) and 1GB of DDR3 
RAM.

I found it's useful to 
recompile everything with GCC 4.7.2, because it supports specific ARM Cortex 
optimizations and auto-vectorialization 
using the NEON SIMD unit; you can gain a nice speed boost.
My CFLAGS are 
'-march=armv7-a -mtune=cortex-a7 -ffast-math -
mfpu=neon-vfpv4 -Ofast'

Fernando


>On Aug 11, 2013 8:16 AM, "address@hidden" <address@hidden> wrote:
>
>> 
Hello everyone,
>>
>> first of all: a BIG, BIG THANK YOU to everyone here for Fluidsynth.
>> It's a wonderful 
application, I
>> like and use it a lot!
>>
>> I'm running Fluidsynth 1.1.6 on a small Arm board running Linux 
(something
>> like a Cubieboard.
>> Say a RaspPi on steroids).
>> I recompiled everything to gain as much performances 
as possible, and
>> am really happy about
>> it (175 MB of SF2, 128 voices, 21ms latency and
>> hardly breaks a 
sweat!).
>>
>> My question. hoping not to waste too much of
>> your time.
>>
>> I'm running Fluidsynth in unattended 
Server mode ( -s ): the ARM board
>> is headless and connected to a MIDI
>> input (master keyboard and/or
>> 
sequencer).
>>
>> I'd like to change some Fluidsynth settings "on the fly":
>>
>> - without
>> resorting to the 
integrated shell (because I can't use it: headerless
>> board without keypad)
>> - without having to send
>> MIDI 
commands using my MIDI keyboard (because it's very
>> complicated with my model)
>> - without restarting Fluidsynth
>>

>> In
>> particular, I'd like to change:
>> gain (-g)
>> reverb (-R)
>> chorus (-C)
>> General MIDI bank
>>
>> So I was 
thinking of a shell
>> script or C program I may write,
>> triggered by an appropriate physical input (I can do that, I 
have
>> plenty GPIOs on the
>> board).
>> The program/script should "talk" to Fluidsynth server and change some
>> 
settings in realtime, without restarting
>> it (a brief pause is OK).
>>
>> I've read the documentation, and from what 
I gather, it should be somehow
>> possible using
>> Fluidsynth API via libfluidsynth.
>> But every example I've found 
creates a new Synth before setting
>> parameters, etc.
>> I
>> don't want to create a new synth: I only want to change 
the settings of
>> the Fluidsynth server which is already running.
>>
>>
>> Is it possible?
>> Any hint, code 
fragment...?
>>
>> Thanks a lot for your patience. :-)
>>
>> Best regards,
>>
>> Fernando
>>
>>
>> Invita i tuoi amici 
e Tiscali ti premia! Il consiglio di un amico vale più
>> di uno spot in TV. Per ogni nuovo abbonato 30 € di premio per 
te e per lui!
>> Un amico al mese e parli e navighi sempre gratis:
>> http://freelosophy.tiscali.it/
>>
>> 
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>>
>




Invita i tuoi amici e Tiscali ti premia! Il consiglio di un amico vale più di 
uno spot in TV. Per ogni nuovo abbonato 30 € di premio per te e per lui! Un 
amico al mese e parli e navighi sempre gratis: http://freelosophy.tiscali.it/