Re: minor FluidSynth sponsorship opportunity (Re: [fluid-dev] Tickets, project status, and 1.1.0)

[josh]

Hello Kevin,

I did some research on these parameters by also looking at the source  
code.  The FluidSynth C API differs as far as the allowable ranges for  
some reverb/chorus parameters in comparison to the command interface.   
This seems like a bug to me.

Notes:

- cho_set_nr is not Chorus delay from what I know.  Its actually the  
number of Chorus "voices".

- rev_setlevel command takes -31.0 to 31.0 but the code clamps this  
value between 0.0 and 1.0, so that is the actual usable range.

- rev_setroomsize command takes 0.0 to <1.2.  The actual value 1.2  
seems to fail the test <1.2 for some reason (1.1999999 works for  
example, but 1.2 does not).

- fluid_revmodel_setroomsize, fluid_revmodel_setdamp,  
fluid_revmodel_setwidth do not check or clamp the input value.   
Setting values outside of the allowed command range, could lead to  
unexpected behavior.

- Max allowed chorus depth depends on sample rate of synth.  22050 =  
~92.92, 44100 = ~46.46, 48000 = ~42.68, 96000 = ~21.34


default, min, max:

Gain: 0.2, 0.0, 10.0
Reverb Level: 0.9, 0.0, 1.0
Reverb roomsize: 0.2, 0.0, <1.2
Reverb damping: 0.0, 0.0, 1.0
Reverb width: 0.5, 0.0, 100.0
Chorus nr: 3, 0, 99
Chorus level: 2.0, 0.0, 10.0 (reasonable level is < 1.0)
Chorus speed: 0.3, >0.29, 5.0
Chorus depth: 8.0, 0.0, (depends on sample rate)
Chorus mode: FLUID_CHORUS_MOD_SINE



Seems like a bit of a mess to me.  I think it would be nice to have  
individual FluidSynth settings parameters for these, then the valid  
range could be queried from the API.  I added a ticket for this:
http://fluidsynth.resonance.org/trac/ticket/49

$25 would be most appreciated and was definitely an incentive to  
research this!  You could send it to my paypal email address:  
address@hidden

Best regards,
Josh Green


Quoting Kevin Fishburne <address@hidden>:
>        address@hidden wrote: Sponsorship would be an interesting
> thing to look into.  Setting up paypal donations could also be good
> or having a bounty system (users pledge an amount for a certain
> task).  I have not yet seriously attempted making money at working on
> free software, though it has consumed much of my time in the past 10
> years.  The need to make an income definitely affects how much time I
> have available for free software projects though, so receiving money
> for working on FluidSynth would definitely give me more time to work
> on it.
>  On that note if anyone can correct/verify and fill in this table
> I'll pay them $25 U.S. by whatever method they like. I pulled some
> additional tentative values by issuing commands with various numbers
> to a FluidSynth server daemon, which sometimes would reply with
> "Values should be between x and y".
>
> Also if anyone knows if these value ranges differ between the shell,
> server, and API interfaces that would be extremely useful. I perused
> the source code to the best of my ability and could only pull some
> possible value ranges for these settings.
>
>         EFFECT
>  MEASUREMENT
>  TYPE
>  DEFAULT
>  MINIMUM
>  MAXIMUM
>  COMMAND
>
>         Gain
>
>  float
>  0.2
>  0.0
>  5.0
>  gain x
>
>         Reverb Level
>
>  float
>  3.0
>  0.0
>  < 31.0
>  rev_setlevel x
>
>         Reverb Room Size
>
>  float
>  0.84
>  0.0
>  1.0
>  rev_setroomsize x
>
>         Reverb Damping
>
>  float
>  0.2
>  0.0
>  1.0
>  rev_setdamp x
>
>         Reverb Width
>
>  float
>  1.0
>  0.0
>  100
>  rev_setwidth x
>
>         Chorus Level
>
>  float
>
>  0.0
>  30.0
>  cho_set_level x
>
>         Chorus Delay
>  Lines
>  integer
>  3
>  0
>  100
>  cho_set_nr x
>
>         Chorus Speed
>  Hz
>  float
>
> 0.29            5.0
>  cho_set_speed x
>
>         Chorus Depth
>  ms
>  float
>
>  0.0
>  10.0
>  cho_set_depth x
>
> I need this in order to finish a FluidSynth GUI and SoundFont
> management app. It's already pretty much completed but I need to
> adjust the slider value ranges so they are consistent with each other
> and have sane defaults.
>
>         KEVIN FISHBURNE
>
>         Eight Virtues
>
>         www:
> e-mail:
> phone:  http://sales.eightvirtues.com[1]
>  address@hidden
>  (770) 853-6271
>
>
>
> Links:
> ------
> [1] http://sales.eightvirtues.com
> [2] mailto:address@hidden