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rds.c
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rds.c
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/* Some of RBDS standard functions
ftp://ftp.rds.org.uk/pub/acrobat/rbds1998.pdf
Copyright (c) 2014 Andrey Chilikin (https://github.com/achilikin)
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <ctype.h>
#include <string.h>
#include "rds.h"
#ifndef _BM
#define _BM(bit) (1 << ((uint16_t)bit)) // convert bit number to bit mask
#endif
int verbose = 1;
#define _BM(bit) (1 << ((uint16_t)bit)) // convert bit number to bit mask
const char *rds_gt_00 = "Basic tuning and switching information";
const char *rds_gt_01 = "Program-item number and slow labeling codes";
const char *rds_gt_02 = "Radiotext";
const char *rds_gt_03A = "Applications Identification for Open Data";
const char *rds_gt_03B = "Open data application";
const char *rds_gt_04A = "Clock-time and date";
const char *rds_gt_04B = "Open data application";
const char *rds_gt_05 = "Transparent data channels or ODA";
const char *rds_gt_06 = "In house applications or ODA";
const char *rds_gt_07A = "Radio paging or ODA";
const char *rds_gt_07B = "Open data application";
const char *rds_gt_08 = "Traffic Message Channel or ODA";
const char *rds_gt_09 = "Emergency warning systems or ODA";
const char *rds_gt_10A = "Program Type Name";
const char *rds_gt_10B = "Open data application";
const char *rds_gt_11 = "Open data application";
const char *rds_gt_12 = "Open data application";
const char *rds_gt_13A = "Enhanced Radio paging or ODA";
const char *rds_gt_13B = "Open data application";
const char *rds_gt_14 = "Enhanced Other Networks information";
const char *rds_gt_15A = "Fast basic tuning and switching information (phased out)";
const char *rds_gt_15B = "Fast tuning and switching information";
static const char *rds_gt_names[] = {
rds_gt_00, rds_gt_00,
rds_gt_01, rds_gt_01,
rds_gt_02, rds_gt_02,
rds_gt_03A, rds_gt_03B,
rds_gt_04A, rds_gt_04B,
rds_gt_05, rds_gt_05,
rds_gt_06, rds_gt_06,
rds_gt_07A, rds_gt_07B,
rds_gt_08, rds_gt_08,
rds_gt_09, rds_gt_09,
rds_gt_10A, rds_gt_10B,
rds_gt_11, rds_gt_11,
rds_gt_12, rds_gt_12,
rds_gt_13A, rds_gt_13B,
rds_gt_14, rds_gt_14,
rds_gt_15A, rds_gt_15B
};
const char *rds_gt_name(uint8_t group, uint8_t version)
{
int idx = (group & 0x0F)*2 + (version & 0x01);
return rds_gt_names[idx];
}
static char *rds_swap16(void *ptr)
{
char *p8 = (char *)ptr;
char tmp = p8[0];
p8[0] = p8[1];
p8[1] = tmp;
return (char *)ptr;
}
static int rds_add_af(rds_gt00a_t *dst, uint8_t *paf)
{
if (paf[1] == 250) // skip LF/MF for now
return 0;
for(int n = 0; n < 2; n++) {
if (paf[n] >= 225 && paf[n] <= 249) { // number of af
dst->naf = paf[n] - 224;
memset(dst->af, 0, sizeof(dst->af));
continue;
}
if (!paf[n] || paf[n] > 204)
continue;
for(int i = 0; i < 25; i++) {
if (dst->af[i] == 0)
dst->af[i] = paf[n];
if (dst->af[i] == paf[n])
break;
}
}
return 0;
}
int rds_parse_gt00a(uint16_t *prds, rds_gt00a_t *pgt)
{
uint8_t ci = (prds[RDS_B] & 0x03);
pgt->ta = !!(prds[RDS_B] & RDS_TA); // Traffic Announcement
pgt->ms = (prds[RDS_B] & RDS_MS) ? 'M' : 'S'; // Music/Speech
// Decoder control bit
if (prds[RDS_B] & RDS_DI)
pgt->di |= _BM(3-ci);
else
pgt->di &= ~_BM(3-ci);
pgt->ci = ci;
pgt->valid |= 1 << ci;
if (!(prds[RDS_B] & RDS_VER)) {
uint8_t *paf = (uint8_t *)rds_swap16(&prds[RDS_C]);
rds_add_af(pgt, paf);
}
ci <<= 1;
if (pgt->ps[0] == '\0') {
memset(pgt->ps, ' ', 8);
pgt->ps[8] = '\0';
}
char *pchar = rds_swap16(&prds[RDS_D]);
for(int i = 0; i < 2; i++) {
if (isalnum(pchar[i]) || pchar[i] == ' ')
pgt->ps[ci+i] = pchar[i];
}
return 0;
}
int rds_parse_gt01a(uint16_t *prds, rds_gt01a_t *pgt)
{
pgt->rpc = prds[RDS_B] & 0x1F;
pgt->la = !!(prds[RDS_C] & 0x8000);
pgt->vc = (prds[RDS_C] >> 12) & 0x07;
pgt->slc = prds[RDS_C]& 0x0FFF;
pgt->pinc = prds[RDS_D]& 0x0FFF;
return 0;
}
int rds_parse_gt02a(uint16_t *prds, rds_gt02a_t *pgt)
{
uint8_t ab = !!(prds[RDS_B] & RDS_AB);
uint8_t si = (prds[RDS_B] & 0x0F);
if (pgt->rt[0] == '\0' || pgt->ab != ab) {
memset(pgt->rt, ' ', 64);
pgt->rt[64] = '\0';
}
pgt->ab = ab;
pgt->si = si;
pgt->valid |= 1 << si;
si *= 4;
char *pchar = rds_swap16(&prds[RDS_C]);
rds_swap16(&prds[RDS_D]);
for (int i = 0; i < 4; i++) {
uint8_t ch = pchar[i];
if (isalnum(ch) || ch == ' ') {
if (ch == '\r') {
pgt->valid = 0xFFFF;
ch = '^';
}
pgt->rt[si + i] = ch;
}
}
return 0;
}
int rds_parse_gt03a(uint16_t *prds, rds_gt03a_t *pgt)
{
pgt->agtc = (prds[RDS_B] >> 1) & 0x0F;
pgt->ver = prds[RDS_B] & 0x01;
uint16_t msg = prds[RDS_C];
pgt->msg = msg;
pgt->aid = prds[RDS_D];
pgt->vc = msg >> 14;
if (pgt->vc == 0) {
pgt->ltn = (msg >> 6) & 0x3F;
pgt->afi = !!(msg & 0x20);
pgt->m = !!(msg & 0x10);
pgt->i = !!(msg & 0x08);
pgt->n = !!(msg & 0x04);
pgt->r = !!(msg & 0x02);
pgt->u = !!(msg & 0x01);
}
else {
pgt->g = (msg >> 12) & 0x03;
pgt->sid = (msg >> 6) & 0x3F;
pgt->ta = (msg >> 4) & 0x03;
pgt->tw = (msg >> 2) & 0x03;
pgt->td = (msg >> 0) & 0x03;
}
return 0;
}
int rds_parse_gt04a(uint16_t *prds, rds_gt04a_t *pgt)
{
uint8_t hour = (prds[RDS_D] >> 12) & 0x0F;
hour |= (prds[RDS_C] & 0x01) << 4;
if (hour > 23)
return -1;
uint8_t minute = (prds[RDS_D] >> 6) & 0x3F;
if (minute > 59)
return -1;
int8_t tz = prds[RDS_D] & 0x0F;
uint32_t date = (prds[RDS_C] >> 1);
date |= (prds[RDS_B] & 0x03) << 15;
int y = (int)(((double)date - 15078.2)/365.25);
int m = (int)((((double)date - 14956.1) - (int)(y*365.25))/30.6001);
int d = date - 14956 - (int)(y*365.25) - (int)(m*30.60001);
int k = (m == 14 || m == 15) ? 1 : 0;
y += k;
m = m - 1 - k*12;
pgt->hour = hour;
pgt->minute = minute;
pgt->tz_hour = tz >> 1;
pgt->tz_half = tz &0x01;
pgt->ts_sign = prds[RDS_D] & _BM(5);
pgt->day = d;
pgt->month = m;
pgt->year = y + 1900;
return 0;
}
int rds_parse_gt08a(uint16_t *prds, rds_gt08a_t *pgt)
{
if (pgt->spn[0] == '\0') {
memset(pgt->spn, ' ', 8);
pgt->spn[8] = '\0';
}
pgt->x4 = !!(prds[RDS_B] & 0x10);
pgt->vc = (prds[RDS_B] & 0x0F);
pgt->x3 = !!(prds[RDS_B] & 0x08);
pgt->x2 = !!(prds[RDS_B] & 0x04);
pgt->y = prds[RDS_C];
pgt->d = !!(prds[RDS_C] & 0x8000);
pgt->dir = !!(prds[RDS_C] & 0x4000);
pgt->ext = (prds[RDS_C] >> 11) & 0x07;
pgt->eve = prds[RDS_C] & 0x7FF;
pgt->loc = prds[RDS_D];
return 0;
}
int rds_parse_gt10a(uint16_t *prds, rds_gt10a_t *pgt)
{
uint8_t ab = !!(prds[RDS_B] & RDS_AB);
uint8_t ci = (prds[RDS_B] & 0x01);
if (pgt->ps[0] == '\0' || pgt->ab != ab) {
memset(pgt->ps, ' ', 8);
pgt->ps[8] = '\0';
}
pgt->ci = ci;
pgt->ab = ab;
ci *= 4;
char *pchar = rds_swap16(&prds[RDS_C]);
rds_swap16(&prds[RDS_D]);
for(int i = 0; i < 4; i++) {
if (isalnum(pchar[i]) || pchar[i] == ' ')
pgt->ps[ci+i] = pchar[i];
}
return 0;
}
int rds_parse_gt14a(uint16_t *prds, rds_gt14a_t *pgt)
{
char *pchar = rds_swap16(&prds[RDS_C]);
if (pgt->pi_on != prds[RDS_D]) {
rds_hdr_t hdr;
memcpy(&hdr, &pgt->hdr, sizeof(hdr));
memset(pgt, 0, sizeof(rds_gt14a_t));
memset(pgt->ps, ' ', 8);
memcpy(&pgt->hdr, &hdr, sizeof(hdr));
}
pgt->tp_on = !!(prds[RDS_B] & 0x10);
pgt->variant = prds[RDS_B] & 0x0F;
pgt->info = prds[RDS_C];
pgt->pi_on = prds[RDS_D];
pgt->avc |= 1 << pgt->variant;
if (pgt->variant < 4) {
for(int i = 0; i <2; i++) {
if (isalnum(pchar[i]) || pchar[i] == ' ')
pgt->ps[pgt->variant*2+i] = pchar[i];
}
return 0;
}
if (pgt->variant == 4) {
pgt->af[0] = pchar[1];
pgt->af[1] = pchar[0];
return 0;
}
if (pgt->variant < 10) {
pgt->mf[pgt->variant - 5] = prds[RDS_C];
return 0;
}
if (pgt->variant == 12) {
pgt->li = prds[RDS_C];
return 0;
}
if (pgt->variant == 13) {
pgt->pty = prds[RDS_C];
return 0;
}
if (pgt->variant == 14) {
pgt->pin = prds[RDS_C];
return 0;
}
return 0;
}