Famitone2 tools via emscripten

This is a quick hack of shiru's neslib tools to work within emscripten. This will allow them to be loaded in javascript/web applications, and used as appropriate.

The original tools were released into the Public Domain, so they are used with permission. I am releasing this under MIT, though if for some reason that's restrictive for you, you are welcome to contact me to use another license.

How's it work?

Basically, the original files are patched slightly to run on linux (mostly removing an unused import and swapping out a method), then compiled with emscripten and made available as a library.

emscripten does come with a bit of overhead - the tools each cost about 200kb - which is pretty big when considering web tooling. The library makes an effort to only load the large files when necessary, so the browser won't be bogged down until the user needs this.

Library Methods

nsf2data (sound effect conversion)

Usage: nsf2data(nsfData, options)

nsfData: A uint8Array of data that a nsf file contains. If you're using node, you can get it like this:

const nsfData = Uint8Array.from(fs.readFileSync('/path/to/sfx.nsf'))

Options: An object with parameters to configure the nsf generation

| option | Potential Values | Description | |----------------|------------------|------------------------------------------------| | assembler | asm6 or ca65 | Which assembler to build for (Default: ca65) | | ntscOnly | true or false| Whether to generate only ntsc (Default: false) | | palOnly | true or false| Whether to generate only pal (Default: false) | | moduleSettings | Any object | Settings to pass through to emscripten's module|

Returns: An object in the following format:

{
    data: "; Assembly file output...", // This is the full text file output, in string form
    size: 500, // How many bytes the exported data takes up
    effects: 5 // How many sound effects were converted
}

Example:

const testNsf = Uint8Array.from(fs.readFileSync('/path/to/file.nsf'))
const result = await nsf2data(testNsf, {assembler: 'ca65', ntscOnly: true})
console.log(result)

text2data (music conversion)

Usage: text2data(textData, options)

textData: A string of music data usually found in music.txt. If you're using node, you can get it like this:

const textData = fs.readFileSync('/path/to/music.txt').toString()

Options: An object with parameters to configure the nsf generation

| option | Potential Values | Description | |-----------------|-------------------|------------------------------------------------------------------| | assembler | asm6 or ca65 | Which assembler to build for (Default: ca65) | | separateFiles | true or false | Whether to break each song into a separate file (Default: false) | | channels | Number 1-5 | The number of channels to include (Default: 5) | | musicName | Any string | The name to use for the exported data. Will be postfixed with _data (Default: music) | | moduleSettings | Any object | Settings to pass through to emscripten's module |

Returns: An object in the following format:

 {
    data: "; Assembly file output...", // This is the full text file output, in string form
    dataSize: 2000, // How many bytes the exported data takes up
    dpcmSize: 50, // How many bytes dcpm takes up 
    songs: 5 // How many songs were converted
}

If separateFiles is set to true, data will take a different format:

{
    data: [
        "; Assembly file output 1...", // This is the full text file output, in string form
        "; Assembly file output 2...",
    ],
    size: 2000, // How many bytes the exported data takes up
    songs: 5 // How many songs were converted
}

nesasmc (Convert nesasm to ca65 and asm6)

This is a little helper that came with the tool, which I believe was used on famitone2 itself. This is included in case you find it useful.

It has no specific options, just pass it an assembly file. Less checking is done on this than on // others. It also has no output, so we don't provide much. But, if you need it, it's here.

Usage: nesasmc(textData)

textData: A valid nesasm program, in a string.

Options: An object with parameters to configure asm conversion | option | Potential Values | Description | |-----------------|-------------------|-------------------------------------------------| | moduleSettings | Any object | Settings to pass through to emscripten's module |

Returns: An object in the following format:

{
    ca65: "; ca65 code" // Source code in ca65 format
    asm6: "; asm6 code" // Source code in asm6 format
}

License

This code is released under the MIT license. See details in the license file.