Create a Codec2 object (Codec2::new(Codec2Mode::MODE_3200)) then repeatedly obtain 8khz
16-bit raw audio samples and call encode to encode blocks of 160 samples into an 8-byte
(64-bit) compressed form, in order. On the receiving end, create a Codec2 object and repeatedly
call decode to decompress each chunk of 8 received bytes into the next 160 samples.
Complete example below.
Add this to your Cargo.toml:
toml
[dependencies]
zerocopy = "0.3.0"
codec2 = "0"
main.rs:
```rust use codec2::; use std::env::args; use std::io::prelude::; use zerocopy::LayoutVerified;
fn main() -> std::io::Result<()> { if args().len() != 4 || (args().nth(1).unwrap() != "enc" && args().nth(1).unwrap() != "dec") { eprintln!("Usage: {} (enc|dec) inputfile outputfilename", args().nth(0).unwrap()); eprintln!("Files should be raw 16-bit signed 8khz audio"); return Ok(()); } let mut fin = std::fs::File::open(args().nth(2).unwrap())?; let mut fout = std::fs::File::create(args().nth(3).unwrap())?; let mut c2 = Codec2::new(Codec2Mode::MODE3200); let mut sampsbuf = vec![0; c2.samplesperframe() * 2]; //u8 I/O buffer for 16-bit samples let mut packed = vec![0; (c2.bitsperframe() + 7) / 8]; //u8 I/O buffer for encoded bits if args().nth(1).unwrap() == "enc" { while fin.readexact(&mut sampsbuf).isok() { let samps = LayoutVerified::newslice(&sampsbuf[..]).expect("bad alignment"); //assumes samples are in correct endianness c2.encode(&mut packed, &samps[..]); fout.writeall(&packed)?; } } else { while fin.readexact(&mut packed).isok() { let mut samps = LayoutVerified::newslice(&mut sampsbuf[..]).expect("bad alignment"); c2.decode(&mut samps[..], &packed); fout.write_all(&sampsbuf)?; } } Ok(()) } ```