kuba/fm-dx-webserver
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Not sure which has better code, firmware, or this? This is okay, but toy lang. Firmware was horrible.

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kuba
2026-02-23 23:15:15 +01:00
parent d0a26d2346
commit 410c39a6b8
25 changed files with 978 additions and 512 deletions
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server/rds.js
+184
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const { rdsEccLookup, iso, countries } = require("./rds_country.js")
class RDSDecoder {
constructor(data) {
this.data = data;
this.clear()
}
clear() {
this.data.pi = '?';
this.ps = Array(8).fill(' ');
this.ps_errors = Array(8).fill("0");
this.rt0 = Array(64).fill(' ');
this.rt0_errors = Array(64).fill("0");
this.rt1 = Array(64).fill(' ');
this.rt1_errors = Array(64).fill("0");
this.data.ps = '';
this.data.rt1 = '';
this.data.rt0 = '';
this.data.pty = 0;
this.data.tp = 0;
this.data.ta = 0;
this.data.ms = -1;
this.data.rt_flag = 0;
this.rt1_to_clear = false;
this.rt0_to_clear = false;
this.data.ecc = null;
this.data.country_name = ""
this.data.country_iso = "UN"
this.af_len = 0;
this.data.af = []
this.af_am_follows = false;
this.last_pi_error = 0;
}
decodeGroup(blockA, blockB, blockC, blockD, error) {
const a_error = (error & 0xC0) >> 6;
const b_error = (error & 0x30) >> 4;
const c_error = (error & 0xc) >> 2;
const d_error = error & 3;
if(this.last_pi_error > a_error) {
this.data.pi = blockA.toString(16).toUpperCase().padStart(4, '0');
this.last_pi_error = a_error;
}
if(b_error != 0) return; // B chooses what group this is, if this has errors, we are screwed
const group = (blockB >> 12) & 0xF;
const version = (blockB >> 11) & 0x1;
this.data.tp = Number((blockB >> 10) & 1);
this.data.pty = (blockB >> 5) & 0b11111;
if (group === 0) {
this.data.ta = (blockB >> 4) & 1;
this.data.ms = (blockB >> 3) & 1;
if(version === 0 && c_error !== 3) {
var af_high = blockC >> 8;
var af_low = blockC & 0xFF;
var BASE = 224;
var FILLER = 205;
var AM_FOLLOWS = 250;
if(af_high >= BASE && af_high <= (BASE+25)) {
this.af_len = af_high-BASE;
if(this.af_len !== this.data.af.length) {
this.data.af = [];
this.af_am_follows = false;
if(af_low != FILLER && af_low != AM_FOLLOWS) this.data.af.push((af_low+875)*100)
else if(af_low == AM_FOLLOWS) this.af_am_follows = true;
}
} else if(this.data.af.length != this.af_len) {
if(!(af_high == AM_FOLLOWS || this.af_am_follows)) {
var freq = (af_high+875)*100;
if(!this.data.af.includes(freq)) this.data.af.push(freq);
}
if(this.af_am_follows) this.af_am_follows = false;
if(!(af_high == AM_FOLLOWS || af_low == FILLER || af_low == AM_FOLLOWS)) {
var freq = (af_low+875)*100;
if(!this.data.af.includes(freq)) this.data.af.push(freq);
}
if(af_low == AM_FOLLOWS) this.af_am_follows = true;
}
}
if(d_error === 3) return; // Don't risk it
const idx = blockB & 0x3;
this.ps[idx * 2] = String.fromCharCode(blockD >> 8);
this.ps[idx * 2 + 1] = String.fromCharCode(blockD & 0xFF);
this.ps_errors[idx * 2] = error;
this.ps_errors[idx * 2 + 1] = error;
this.data.ps = this.ps.join('');
this.data.ps_errors = this.ps_errors.join(',');
} else if (group === 1 && version === 0) {
var variant_code = (blockC >> 12) & 0x7;
switch (variant_code) {
case 0:
this.data.ecc = blockC & 0xff;
this.data.country_name = rdsEccLookup(blockA, this.data.ecc);
if(this.data.country_name.length === 0) this.data.country_iso = "UN";
else this.data.country_iso = iso[countries.indexOf(this.data.country_name)]
break;
default: break;
}
} else if (group === 2) {
const idx = blockB & 0b1111;
this.rt_ab = Boolean((blockB >> 4) & 1);
var multiplier = (version == 0) ? 4 : 2;
if(this.rt_ab) {
if(this.rt1_to_clear) {
this.rt1 = Array(64).fill(' ');
this.rt1_errors = Array(64).fill("0");
this.rt1_to_clear = false;
}
if(c_error !== 3 && multiplier !== 2) {
this.rt1[idx * multiplier] = String.fromCharCode(blockC >> 8);
this.rt1[idx * multiplier + 1] = String.fromCharCode(blockC & 0xFF);
this.rt1_errors[idx * multiplier] = error;
this.rt1_errors[idx * multiplier + 1] = error;
}
if(d_error !== 3) {
var offset = (multiplier == 2) ? 0 : 2;
this.rt1[idx * multiplier + offset] = String.fromCharCode(blockD >> 8);
this.rt1[idx * multiplier + offset + 1] = String.fromCharCode(blockD & 0xFF);
this.rt1_errors[idx * multiplier + offset] = error;
this.rt1_errors[idx * multiplier + offset + 1] = error;
}
var i = this.rt1.indexOf("\r")
while(i != -1) {
this.rt1[i] = " ";
i = this.rt1.indexOf("\r");
}
this.data.rt1 = this.rt1.join('');
this.data.rt1_errors = this.rt1_errors.join(',');
this.data.rt_flag = 1;
this.rt0_to_clear = true;
} else {
if(this.rt0_to_clear) {
this.rt0 = Array(64).fill(' ');
this.rt0_errors = Array(64).fill("0");
this.rt0_to_clear = false;
}
if(c_error !== 3 && multiplier !== 2) {
this.rt0[idx * multiplier] = String.fromCharCode(blockC >> 8);
this.rt0[idx * multiplier + 1] = String.fromCharCode(blockC & 0xFF);
this.rt0_errors[idx * multiplier] = error;
this.rt0_errors[idx * multiplier + 1] = error;
}
if(d_error !== 3) {
var offset = (multiplier == 2) ? 0 : 2;
this.rt0[idx * multiplier + offset] = String.fromCharCode(blockD >> 8);
this.rt0[idx * multiplier + offset + 1] = String.fromCharCode(blockD & 0xFF);
this.rt0_errors[idx * multiplier + offset] = error;
this.rt0_errors[idx * multiplier + offset + 1] = error;
}
var i = this.rt0.indexOf("\r");
while(i != -1) {
this.rt0[i] = " ";
i = this.rt0.indexOf("\r");
}
this.data.rt0 = this.rt0.join('');
this.data.rt0_errors = this.rt0_errors.join(',');
this.data.rt_flag = 0;
this.rt1_to_clear = true;
}
} else {
// console.log(group, version)
}
}
}
module.exports = RDSDecoder;