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# 🗃 `para`
## What?
A decoder and utility for the Flipnote Studios `.ppm` animation format.
## Why this implementation over [the original](https://github.com/Flipnote-Collective/ppm-parser)?
This implementation is
- [SIGNIFICANTLY faster](#speed),
- implemented in safe Rust (a language with strict type-checking!),
- and being actively updated.
### Speed
In a two-hundred-forty-four frame `.ppm` benchmark running the command
`$ para ./benchmark.ppm gif benchmark.gif` on a twelve-core,
twenty-four-thread Ryzen 9 processor, para took an average of 566.9893 milliseconds,
while ppm-parser took an average of 50.4171397 seconds.
Running the command `$ para ./benchmark.ppm 0 benchmark.png` on a twelve-core,
twenty-four-thread Ryzen 9 processor, para took an average of 8.6251 milliseconds,
while ppm-parser took an average of 358.2232 milliseconds.
Rust versus Python isn't very fair, however, this benchmark shows the speed improvements
that para brings to the table.
## Things To Come
- Support for other formats (namely `.kwz`)
- Optimizations here and there
- Friendlier CLI
- Possible GUI
## Getting up and Running
### Installation
Prebuilt binaries for x86_64-based Linux systems and Windows are available in the
[releases](https://github.com/Usugata/para/releases/latest). If you are using
a different operating system or architecture such as macOS, you'll have to build
and install the tool yourself!
```shell
$ cargo install --git https://github.com/Usugata/para --branch main
```
If you are building and installing yourself, you must have
[Rust](https://www.rust-lang.org/) installed!
### Usage
```shell
usage: para <in> <index option> <out>
index options:
gif
thumb
dump
integer(u16)
```
### Examples
- `$ para ./example.ppm 23 example.png` will output the twenty-fourth frame
of `example.ppm` to `example.png`
- `$ para ./example.ppm thumb example.png` will output the thumbnail of
`example.ppm` to `example.png`
- `$ para ./example.ppm dump example.json` will output the metadata of
`example.ppm` to `example.json`
- `$ para ./example.ppm gif example.gif` will output `example.ppm`
to `example.gif`
### Prebuilt Binaries
Prebuilt binaries for the latest release may or may not be found
[here](https://github.com/Usugata/para/releases/latest).
## Credits
- [jaames](https://github.com/jaames) for completing PPM reverse-engineering and
writing the [original](https://github.com/Flipnote-Collective/ppm-parser) implementation.
- [bricklife](http://ugomemo.g.hatena.ne.jp/bricklife/20090307/1236391313),
[mirai-iro](http://mirai-iro.hatenablog.jp/entry/20090116/ugomemo_ppm),
[harimau_tigris](http://ugomemo.g.hatena.ne.jp/harimau_tigris), and other members
of the Japanese Flipnote community who started reverse-engineering the PPM format
almost as soon as the app was released.
- Midmad and WDLMaster for identifying the adpcm sound codec used.
- [steven](http://www.dsibrew.org/wiki/User:Steven) and
[yellows8](http://www.dsibrew.org/wiki/User:Yellows8) for the PPM documentation on DSiBrew.
- [PBSDS](https://github.com/pbsds) for more PPM reverse-engineering, as well as
writing [hatenatools](https://github.com/pbsds/Hatenatools)
## License
[MIT License](./LICENSE)
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