Yusaino-Audio

A migration of Thomas Grill's audio compression solution for Arduino, from Python 2 to JavaScript.

This repository contains the audio encoding and decoding (on computer) part. For hardware playback, please see Yusaino. By re-coding, I am able to understand the whole design.

The main reason of choosing JavaScript is I don't know Python well. After the immigration, I felt strong attractions from both Python and JavaScript, and their resemblance deep within. Thomas heavily used iterator pattern in his original code, and I tried to keep those by writing JavaScript equivalents. In the final JavaScript code, you can see a huge likelihood with the original code. For example:

dsound8 = map(int,chain((sound8[0],),imap(lambda x: x[1]-x[0],izip(sound8[:-1],sound8[1:]))))

const sint8Audio = Array.from(chain([audio[0]], imap(x => x[1] - x[0], izip(select(audio, [, -1]), select(audio, [1,])))));

Yeah, I wrote chain, imap, izip, select, and slice myself. It's a good practice.

For more details please see comments in the code.

Requirements

Node.js v6.0 and up is required to natively support many ES2015 features. I think the script can also run in modern browsers that support ES2015, but I haven't written a browser wrapper yet.

It is pure JavaScript so running on all platforms is not a dream. Damn you scikits.audiolab!

Usage

Build the project:

npm install
npm run build

And run the CLI script:

node bin/cli [options] <wav-file>

Options:

-h, --help         output usage information
-V, --version      output the version number
-b, --bits <bits>  Bit resolution (not implemented)
-o, --cpp <file>   C/C++ program source code output

The script needs a wave audio file, with these attributes:

• bit depth: 8
• channels: 1 (mono)
• signed: no (unsigned)

Naming

The name comes from Kozue Yusa. But no I am not a lolicon, faithfully. I just happened to win a card of her. ☺

Another introduction from Moegirl wiki (originally in Chinese):

Kozue Yusa is a loli idol appearing in The Idolmaster Cinderella Girls.

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She was introduced on July 17, 2013, when a new region Okinawa opened.

As a loli idol aged 11, her figure data is still below that of an average 9-year-old Japanese girl. She is one of the smallest characters in the whole game.

Her inner attributes are unexpectedly immature. She doesn't speak fluently, and she doesn't understand the meaning of words like "idol" and "interest" at the first appearance. She isn't even sure about her age. So she shows a strong dependency towards others: she needs help to change her clothes, a bliss for lolicons; she doesn't feel wrong when changing clothes in front of the public, a bliss for lolicons; she takes sitting, leaning and sleeping on the producer for granted, a heaven for lolicons.

On the contrary, she has a great talent in memorizing the scripts.

License

GPLv3