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#![doc = include_str!("../readme.md")]
mod bds;
mod beast;
mod cat48;
mod error;
mod file;
use beast::{bds_code_from_decoded, extract_beast_frame};
use clap::{Parser, Subcommand};
use deku::DekuContainerRead;
use rs1090::decode::bds::infer_bds;
use rs1090::decode::cpr::Position;
use rs1090::prelude::*;
use tokio::fs;
use tokio::io::AsyncWriteExt;
#[derive(Debug, Parser)]
#[command(
name = "decode1090",
version,
author = "xoolive",
about = "Decode Mode S demodulated raw messages to JSON format"
)]
struct Options {
#[command(subcommand)]
command: Option<Commands>,
/// Output file instead of stdout
#[arg(long, short, default_value=None)]
output: Option<String>,
/// Individual messages to decode
msgs: Vec<String>,
}
#[derive(Debug, Subcommand)]
enum Commands {
/// Decode ASTERIX CAT48 files (.raw, .da1) to JSON
Cat48 {
/// Input files or glob patterns (e.g., "*.da1", "data/*.raw")
#[arg(required = true)]
inputs: Vec<String>,
/// Output file instead of stdout (JSONL format)
#[arg(long, short)]
output: Option<String>,
/// Output one JSON array instead of JSONL (one record per line)
#[arg(long)]
array: bool,
/// Filter: only include rollcall records (typ field)
#[arg(long)]
only_rollcall: bool,
/// Filter: only include records with BDS payloads
#[arg(long)]
with_bds: bool,
/// Filter: exclude records with all-zero BDS payload
#[arg(long)]
exclude_zero: bool,
/// Filter: only include records with specific declared BDS codes
/// Comma-separated hex codes, e.g. "44,45" or "40,50,60"
#[arg(long)]
filter_bds: Option<String>,
},
/// Decode BDS payload (7 bytes)
Bds {
/// BDS payload as hexadecimal string (56 bits = 7 bytes)
#[arg(required = true)]
payload: String,
/// BDS code (optional, e.g., "40", "50", "60")
/// If provided, decode strictly as this BDS code.
/// If not provided, infer all possible BDS codes.
#[arg(long, short)]
bds: Option<String>,
},
/// Decode Mode S messages from files (JSONL, CSV)
File {
/// Input files (JSONL or CSV Beast format)
#[arg(required = true)]
inputs: Vec<String>,
/// Reference coordinates for the decoding
/// (e.g. --reference LFPG for major airports,
/// --reference 43.3,1.35 or --reference ' -34,18.6' if negative)
#[arg(long, short)]
reference: Option<Position>,
/// Specify input format explicitly (jsonl, csv)
/// If not provided, format is auto-detected
#[arg(long)]
format: Option<String>,
/// Output file instead of stdout
#[arg(long, short)]
output: Option<String>,
/// Deduplication threshold (in ms)
#[arg(long, default_value = "400")]
deduplication: u128,
},
}
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
let options = Options::parse();
// Handle subcommands
match options.command {
Some(Commands::Cat48 {
inputs,
output,
array,
only_rollcall,
with_bds,
exclude_zero,
filter_bds,
}) => {
return cat48::process_cat48(
inputs,
output,
array,
only_rollcall,
with_bds,
exclude_zero,
filter_bds,
)
.await;
}
Some(Commands::Bds { payload, bds }) => {
return bds::process_bds_decode(&payload, bds);
}
Some(Commands::File {
inputs,
reference,
format,
output,
deduplication,
}) => {
return file::process_file_decode(
inputs,
reference,
format,
output,
deduplication,
)
.await;
}
None => {}
}
// Default behavior: decode raw Mode S / BDS messages
let mut output_file = if let Some(output_path) = options.output {
Some(
fs::OpenOptions::new()
.write(true)
.create(true)
.truncate(true)
.open(output_path)
.await?,
)
} else {
None
};
if !options.msgs.is_empty() {
for msg in options.msgs {
let bytes = hex::decode(&msg).unwrap();
let json = match bytes.len() {
// 7 bytes: try Mode S short first, fallback to BDS inference
7 => {
if let Ok(message) = Message::try_from(bytes.as_slice()) {
serde_json::to_string(&message).unwrap()
} else {
// BDS inference fallback
let inferred = infer_bds(&bytes);
let mut decoded_map = serde_json::json!({});
for decoded in inferred.iter() {
let bds_code = bds_code_from_decoded(decoded);
decoded_map[format!("{:02x}", bds_code)] =
serde_json::to_value(decoded)
.unwrap_or(serde_json::json!(null));
}
serde_json::to_string(&serde_json::json!({
"payload": hex::encode(&bytes),
"mode": "infer",
"decoded": decoded_map
}))
.unwrap()
}
}
// 14 bytes: Mode S long message
14 => {
let message = Message::try_from(bytes.as_slice()).unwrap();
serde_json::to_string(&message).unwrap()
}
// 16 bytes: Beast Mode S short (1a32 + 6 ts + 1 signal + 7 payload)
// 23 bytes: Beast Mode S long (1a33 + 6 ts + 1 signal + 14 payload)
16 | 23
if bytes[0] == 0x1a
&& (bytes[1] == 0x32 || bytes[1] == 0x33) =>
{
if let Some((timestamp, frame)) =
extract_beast_frame(&bytes)
{
let message = Message::from_bytes((&frame, 0))
.ok()
.map(|(_, m)| m);
let tmsg = TimedMessage {
timestamp,
frame,
message,
metadata: vec![],
decode_time: None,
};
serde_json::to_string(&tmsg).unwrap()
} else {
continue;
}
}
_ => {
// Try generic Mode S decode for other lengths
if let Ok(message) = Message::try_from(bytes.as_slice()) {
serde_json::to_string(&message).unwrap()
} else {
continue;
}
}
};
if let Some(file) = &mut output_file {
file.write_all(json.as_bytes()).await?;
file.write_all("\n".as_bytes()).await?;
} else {
println!("{json}");
}
}
}
Ok(())
}