emergency sound bank generator

[kotc]

https://java.net/projects/gervill/sources/svn/content/trunk/src/com/sun/media/sound/EmergencySoundbank.java
what is it? its a generator for fully synthetic instruments. license is gpl2. could be an interesting alternative to keep distribution size small. its written in java but i think conversion shouldn't be too hard

[psi29a]

Good idea! :)

Sadly, we can't use GPL code.

It has to be LGPL or freerer.

[kotc]

huh, how about adding cmakelists.txt conditional that selects between gpl2/3/lgpl features that get compiled?

[psi29a]

We wish to keep the entire codebase LGPL, we'll code it from scratch if we need to.

Don't get me wrong, this is a good idea. I've kinda asked for this but in another related issue.

[psi29a]

I stumbled across this recently:
https://csharpsynthproject.codeplex.com

It contains a soundbanck generator and is MIT licensed... wooo!

[chrisisonwildcode]

This might be a silly question .. How compatible is MIT license to LGPL?

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On 26 Feb 2015, at 7:17 pm, Bret Curtis [email protected] wrote:

I stumbled across this recently:
https://csharpsynthproject.codeplex.com

It contains a soundbanck generator and is MIT licensed... wooo!

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[psi29a]

MIT/Expat means... use it however you like, we don't care, just give credit where credit is due. So when included into an LGPL, the their code becomes LGPL.

[psi29a]

Looks like this will be the next project as Lucius of XLEngine (https://github.com/luciusDXL/XL-Engine) has asked for this.

[psi29a]

Something else: https://github.com/rheit/zdoom/tree/master/src/oplsynth

Most of the code there is LGPL. They also use wildmidi... so fair is fair. ;)

[chrisisonwildcode]

I'll look at that when I get the chance. I was thinking of asking is anyone is able to track down opl3 settings for the different midi instruments, including the waveform settings.

[chrisisonwildcode]

unfortunately in zoom the opl code we actually need is not LGPL, instead its some non-commercial use license.

Latest name source has the code GPL'd ...

[psi29a]

Parts are LGPL and some are GPL, look closely at the files and their headers.

nukedopl3.cpp and nukedopl3.h for example are LGPL, as is OPL3.cpp... they have like 3 different implementations.

[chrisisonwildcode]

I had a good look at the files to determine what we need, the main bit we need is in a file that gpl within the meme project.

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On 25 Apr 2016, at 2:01 AM, Bret Curtis [email protected] wrote:

Parts are LGPL and some are GPL, look closely at the files and their headers.

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[chrisisonwildcode]

Sorry. Didn't notice auto correct being a pain. Mame project. The file that emulates the opl chip itself is gpl.

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On 25 Apr 2016, at 2:01 AM, Bret Curtis [email protected] wrote:

Parts are LGPL and some are GPL, look closely at the files and their headers.

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[loki666]

chocolate doom has the latest version of NukedOPL3
https://github.com/chocolate-doom/chocolate-doom/blob/master/opl/opl3.c
it's GPL licensed, but the author is ok to switch it to LGPL.

yet, there is still the issue to "translate" midi into OPL3 programming, and to find a good GM patch set for OPL3

[loki666]

Also, if anyone can make use of this, there is a small bank embedded in Sonivox EAS synth.
https://github.com/murkymark/eas-midi/blob/master/lib_src/wt_44khz.c

[psi29a]

The last one is Apache 2.0, just fyi.

[peteroupc]

Apparently, the technique used to generate many of the synthetic instruments in EmergencySoundbank is to render the instrument's tone in the frequency domain and convert the samples using an inverse Fourier transform. Alternatively, instrument samples can be generated by somehow mixing the public-domain single-cycle wave forms found in the AdventureKid Wave Form Collection.

A related request of mine for public-domain software synthesis and instrument banks.

[peteroupc]

Here is what I found out about how EmergencySoundbank works.

Most of the instruments in EmergencySoundbank are generated by:

• rendering a weighted sum of Gaussian curves in the frequency domain,
• sampling this weighted sum at 44100 Hz,
• rotating each sample in the complex plane by a random angle,
• doing an inverse Fourier transform, and
• taking the real part of the result,

among other things (such as setting the volume and modulation envelopes as well as fading in the beginning of the sound and setting loop points).

A few EmergencySoundbank instruments (generally drum patches) are generated a little differently, namely as a bass part and as a treble part.