ARI external media to WAV

main.rs

use hound;
use std::net::UdpSocket;

// Obtained from: https://github.com/zaf/g711
const ULAW2PCM: [i16; 256] = [
    -32124, -31100, -30076, -29052, -28028, -27004, -25980, -24956, -23932, -22908, -21884, -20860,
    -19836, -18812, -17788, -16764, -15996, -15484, -14972, -14460, -13948, -13436, -12924, -12412,
    -11900, -11388, -10876, -10364, -9852, -9340, -8828, -8316, -7932, -7676, -7420, -7164, -6908,
    -6652, -6396, -6140, -5884, -5628, -5372, -5116, -4860, -4604, -4348, -4092, -3900, -3772,
    -3644, -3516, -3388, -3260, -3132, -3004, -2876, -2748, -2620, -2492, -2364, -2236, -2108,
    -1980, -1884, -1820, -1756, -1692, -1628, -1564, -1500, -1436, -1372, -1308, -1244, -1180,
    -1116, -1052, -988, -924, -876, -844, -812, -780, -748, -716, -684, -652, -620, -588, -556,
    -524, -492, -460, -428, -396, -372, -356, -340, -324, -308, -292, -276, -260, -244, -228, -212,
    -196, -180, -164, -148, -132, -120, -112, -104, -96, -88, -80, -72, -64, -56, -48, -40, -32,
    -24, -16, -8, 0, 32124, 31100, 30076, 29052, 28028, 27004, 25980, 24956, 23932, 22908, 21884,
    20860, 19836, 18812, 17788, 16764, 15996, 15484, 14972, 14460, 13948, 13436, 12924, 12412,
    11900, 11388, 10876, 10364, 9852, 9340, 8828, 8316, 7932, 7676, 7420, 7164, 6908, 6652, 6396,
    6140, 5884, 5628, 5372, 5116, 4860, 4604, 4348, 4092, 3900, 3772, 3644, 3516, 3388, 3260, 3132,
    3004, 2876, 2748, 2620, 2492, 2364, 2236, 2108, 1980, 1884, 1820, 1756, 1692, 1628, 1564, 1500,
    1436, 1372, 1308, 1244, 1180, 1116, 1052, 988, 924, 876, 844, 812, 780, 748, 716, 684, 652,
    620, 588, 556, 524, 492, 460, 428, 396, 372, 356, 340, 324, 308, 292, 276, 260, 244, 228, 212,
    196, 180, 164, 148, 132, 120, 112, 104, 96, 88, 80, 72, 64, 56, 48, 40, 32, 24, 16, 8, 0,
];

fn main() {
    let spec = hound::WavSpec {
        channels: 1,
        sample_rate: 8000,
        bits_per_sample: 16,
        sample_format: hound::SampleFormat::Int,
    };
    let mut writer =
        hound::WavWriter::create("temp.wav", spec).expect("Failed to create WAV writer");
    let socket = UdpSocket::bind("192.168.122.1:34254").expect("Could not bind socket");

    let mut buf = [0; 512];
    for _ in 0..1024 {
        let (bytes, _) = socket.recv_from(&mut buf).expect("Failed to receive");
        let payload = bytes - 12;
        for sample in buf.iter().skip(12).take(payload) {
            writer
                .write_sample(ULAW2PCM[*sample as usize])
                .expect("Failed to write sample");
        }
    }

    writer.finalize().expect("Failed to finalize WAV file");
}