Peppi is a Rust parser for .slp game replay files for Super Smash Brothers Melee for the Nintendo GameCube. These replays are generated by Jas Laferriere's Slippi recording code, which runs on a Wii or the Dolphin emulator.
slp tool has moved to the peppi-slp crate.
In your Cargo.toml:
[dependencies]
peppi = "2.0"One-shot .slp parsing with slippi::read (use peppi::read instead for .slpp):
use std::{fs, io};
use peppi::io::slippi::read;
fn main() {
let mut r = io::BufReader::new(fs::File::open("tests/data/game.slp").unwrap());
let game = read(&mut r, None).unwrap();
println!("{:#?}", game);
}A more involved example
use std::{fs, io};
use peppi::io::slippi::read;
use peppi::frame::Rollbacks;
// `ssbm-data` provides enums for characters, stages, action states, etc.
// You can just hard-code constants instead, if you prefer.
use ssbm_data::action_state::Common::{self, *};
/// Print the frames on which each player died.
fn main() {
let mut r = io::BufReader::new(fs::File::open("tests/data/game.slp").unwrap());
let game = read(&mut r, None).unwrap();
let mut is_dead = vec![false; game.frames.ports.len()];
let rollbacks = game.frames.rollbacks(Rollbacks::ExceptLast);
for frame_idx in 0..game.frames.len() {
if rollbacks[frame_idx] {
continue;
}
for (port_idx, port_data) in game.frames.ports.iter().enumerate() {
match port_data
.leader
.post
.state
.get(frame_idx)
.and_then(|s| Common::try_from(s).ok())
{
Some(DeadDown)
| Some(DeadLeft)
| Some(DeadRight)
| Some(DeadUp)
| Some(DeadUpStar)
| Some(DeadUpStarIce)
| Some(DeadUpFall)
| Some(DeadUpFallHitCamera)
| Some(DeadUpFallHitCameraFlat)
| Some(DeadUpFallIce)
| Some(DeadUpFallHitCameraIce) => {
if !is_dead[port_idx] {
is_dead[port_idx] = true;
println!(
"{} died on frame {}",
game.start.players[port_idx].port,
game.frames.id.get(frame_idx).unwrap(),
)
}
}
_ => is_dead[port_idx] = false,
}
}
}
}Live parsing
use std::fs;
use std::io::BufReader;
use byteorder::ReadBytesExt;
use peppi::io::slippi::de;
fn main() {
let mut r = BufReader::new(fs::File::open("tests/data/game.slp").unwrap());
// UBJSON wrapper (skip if using spectator protocol)
let size = de::parse_header(&mut r, None).unwrap() as usize;
// payload sizes & game start
let mut state = de::parse_start(&mut r, None).unwrap();
// loop until we hit GameEnd or run out of bytes
while de::parse_event(&mut r, &mut state, None).unwrap() != de::Event::GameEnd as u8
&& state.bytes_read() < size
{
println!(
"current frame number: {:?}",
state.frames().id.iter().last()
);
}
// `U` (0x55) means metadata next (skip if using spectator protocol)
if r.read_u8().unwrap() == 0x55 {
de::parse_metadata(&mut r, &mut state, None).unwrap();
}
}The Rust source files in src/frame are generated using Clojure from frames.json, which describes all the per-frame fields present in each version of the spec. If you modify frames.json or the generator code in gen/src, run gen/scripts/frames to regenerate those Rust files.
If you're adding support for a new version of the spec, you'll also need to bump peppi::io::slippi::MAX_SUPPORTED_VERSION.
- Performance: Peppi aims to be the fastest parser for
.slpfiles. - Ergonomics: It should be easy and natural to work with parsed data.
- Lenience: accept-and-warn on malformed data, when feasible.
- Cross-language support: other languages should be able to interact with Peppi easily and efficiently.
- Round-tripping: Peppi can parse a replay and then write it back, bit-for-bit identically.
- Alternative format: Peppi provides an alternative format that is more compressible and easier to work with than
.slp.
The Peppi format (.slpp) is a GNU tar archive containing the following files, in order:
peppi.json: Peppi-specific info.metadata.json: Slippi's metadata block.start.json: JSON representation of the Game Start event.start.raw: Raw binary Game Start event.end.json: JSON representation of the Game End event.end.raw: Raw binary Game End event.frames.arrow: Frame data in Arrow format (see below).
The bulk of this data is in frames.arrow, an Arrow IPC file containing all of the game's frame data. This is a columnar format, which makes .slpp about twice as compressible as .slp.
To convert between formats, use the slp CLI tool.
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