fm.c

   1 /* fm.c - simple V4L2 compatible tuner for radio cards
   2
   3    Copyright (C) 2004, 2006, 2009, 2012 Ben Pfaff <blp@cs.stanford.edu>
   4    Copyright (C) 1998 Russell Kroll <rkroll@exploits.org>
   5
   6    This program is free software; you can redistribute it and/or modify it
   7    under the terms of the GNU General Public License as published by the Free
   8    Software Foundation; either version 2 of the License, or (at your option)
   9    any later version.
  10
  11    This program is distributed in the hope that it will be useful, but WITHOUT
  12    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14    more details.
  15
  16    You should have received a copy of the GNU General Public License along with
  17    this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include <math.h>
  21 #include <errno.h>
  22 #include <stdio.h>
  23 #include <fcntl.h>
  24 #include <stdbool.h>
  25 #include <stdint.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <getopt.h>
  29 #include <string.h>
  30 #include <limits.h>
  31
  32 #include "fmlib.h"
  33
  34 #define DEFAULT_DEVICE  "/dev/radio0"
  35
  36 static double
  37 clamp(double percent)
  38 {
  39         return percent < 0.0 ? 0.0 : percent > 100.0 ? 100.0 : percent;
  40 }
  41
  42 static int
  43 convert_time (const char *string)
  44 {
  45         if (strcmp(string, "forever") == 0 ||
  46             strcmp(string, "-") == 0 ||
  47             atoi(string) < 0)
  48                 return 0;
  49         else if (strcmp(string, "none") == 0 ||
  50                  strcmp(string, "0") == 0)
  51                 return -1;
  52         else
  53         {
  54                 char worktime[80+1];
  55                 int inttime;
  56                 const char *suffix;
  57
  58                 suffix = string + strspn(string, "0123456789");
  59
  60                 strncpy(worktime, string, suffix - string);
  61                 worktime[suffix - string] = '\0';
  62                 inttime = atoi(worktime);
  63
  64                 switch (*suffix)
  65                 {
  66                 case 's':
  67                 case '\0':
  68                         break;
  69                 case 'm':
  70                         inttime *= 60;
  71                         break;
  72                 case 'h':
  73                         inttime *= 60 * 60;
  74                         break;
  75                 case 'd':
  76                         inttime *= 24 * 60 * 60;
  77                         break;
  78                 default:
  79                         break;
  80                 }
  81
  82                 return inttime;
  83         }
  84 }
  85
  86
  87
  88 static char *
  89 format_time (char *buffer, const char *string)
  90 {
  91         if (strcmp(string, "forever") == 0 ||
  92             strcmp(string, "-") == 0 ||
  93             atoi(string) < 0)
  94                 strcpy(buffer, "forever");
  95         else if (strcmp(string, "none") == 0 ||
  96                  strcmp(string, "0") == 0)
  97                 strcpy(buffer, "none");
  98         else
  99         {
 100                 char worktime[80+1];
 101                 const char *suffix;
 102                 char *format;
 103                 int int_time;
 104
 105                 suffix = string + strspn(string, "0123456789");
 106                 strncpy(worktime, string, suffix - string);
 107                 worktime[suffix - string] = '\0';
 108                 int_time = atoi(worktime);
 109
 110                 switch (*suffix)
 111                 {
 112                 case 'm':
 113                         format = "%d minute(s)";
 114                         break;
 115                 case 'h':
 116                         format = "%d hour(s)";
 117                         break;
 118                 case 'd':
 119                         format = "%d day(s)";
 120                         break;
 121                 case 's':
 122                 case '\0':
 123                 default:
 124                         format = "%d second(s)";
 125                 break;
 126                 }
 127
 128                 sprintf(buffer, format, int_time);
 129         }
 130
 131         return buffer;
 132 }
 133
 134 static void
 135 maybe_sleep(const struct tuner *tuner, const char *wait_time)
 136 {
 137         char message[80+1];
 138         int int_wait_time;
 139
 140         int_wait_time = convert_time(wait_time);
 141
 142         if (int_wait_time > 0)
 143         {
 144                 printf("Sleeping for %s\n", format_time(message, wait_time));
 145                 tuner_sleep(tuner, int_wait_time);
 146         } else if (int_wait_time == 0)
 147         {
 148                 printf("Sleeping forever...CTRL-C exits\n");
 149                 for (;;)
 150                         pause();
 151         }
 152 }
 153
 154 static void
 155 usage(void)
 156 {
 157         printf("fmtools fm version %s\n\n", VERSION);
 158         printf("usage: %s [-h] [-o] [-q] [-d <dev>] [-t <tuner>] "
 159                "[-T none|forever|time] <freq>|on|off [<volume>]\n\n",
 160                program_name);
 161         printf("A small controller for Video for Linux radio devices.\n\n");
 162         printf("  -h         display this help\n");
 163         printf("  -o         override frequency range limits of card\n");
 164         printf("  -q         quiet mode\n");
 165         printf("  -d <dev>   select device (default: /dev/radio0)\n");
 166         printf("  -t <tuner> select tuner (default: 0)\n");
 167         printf("  -T <time>  after setting frequency, sleep for some time\n"\
 168                "             (default: none; -=forever)\n");
 169         printf("  <freq>     frequency in MHz (i.e. 94.3)\n");
 170         printf("  on         turn radio on\n");
 171         printf("  off        turn radio off (mute)\n");
 172         printf("  +          increase volume\n");
 173         printf("  -          decrease volume\n");
 174         printf("  <volume>   percentage (0-100)\n");
 175         exit(EXIT_SUCCESS);
 176 }
 177
 178 static void
 179 getconfig(const char *fn,
 180           double *defaultvol, double *increment, char *wait_time)
 181 {
 182         FILE    *conf;
 183         char    buf[256];
 184
 185         if (!fn) {
 186                 snprintf(buf, sizeof buf, "%s/.fmrc", getenv("HOME"));
 187                 fn = buf;
 188         }
 189         conf = fopen(fn, "r");
 190
 191         if (!conf)
 192                 return;
 193
 194         while(fgets(buf, sizeof(buf), conf)) {
 195                 buf[strlen(buf)-1] = 0;
 196                 if (!strncmp(buf, "VOL", 3))
 197                         sscanf(buf, "%*s %lf", defaultvol);
 198                 if (!strncmp(buf, "INCR", 3))
 199                         sscanf(buf, "%*s %lf", increment);
 200                 if (!strncmp(buf, "TIME", 4))
 201                         sscanf(buf, "%*s %s", wait_time);
 202         }
 203
 204         fclose(conf);
 205 }
 206
 207 static void
 208 print_volume(const struct tuner *tuner)
 209 {
 210         if (tuner_has_volume_control(tuner))
 211                 printf(" at %.2f%% volume", tuner_get_volume(tuner));
 212         else
 213                 printf(" (radio does not support volume control)");
 214 }
 215
 216 static void
 217 print_mute(const struct tuner *tuner)
 218 {
 219         if (tuner_is_muted(tuner))
 220                 printf(" (radio is muted, use \"fm on\" to unmute)");
 221 }
 222
 223 int main(int argc, char **argv)
 224 {
 225         struct tuner tuner;
 226         const char *device = NULL;
 227         int index = 0;
 228         bool quiet = false;
 229         bool override = false;
 230         const char *config_file = NULL;
 231         double defaultvol = 12.5;
 232         double increment = 10;
 233         char wait_time_buf[256+1] = "";
 234         const char *wait_time = NULL;
 235
 236         program_name = argv[0];
 237
 238         /* need at least a frequency */
 239         if (argc < 2)
 240                 fatal(0, "usage: %s [-h] [-o] [-q] [-d <dev>] [-t <tuner>] "
 241                       "[-T time|forever|none] "
 242                       "<freq>|on|off [<volume>]\n", program_name);
 243
 244         for (;;) {
 245                 int option = getopt(argc, argv, "+qhot:T:c:d:");
 246                 if (option == -1)
 247                         break;
 248
 249                 switch (option) {
 250                 case 'q':
 251                         quiet = 1;
 252                         break;
 253                 case 'o':
 254                         override = 1;
 255                         break;
 256                 case 't':
 257                         index = atoi(optarg);
 258                         break;
 259                 case 'T':
 260                         wait_time = optarg;
 261                         break;
 262                 case 'd':
 263                         device = optarg;
 264                         break;
 265                 case 'c':
 266                         config_file = optarg;
 267                         break;
 268                 case 'h':
 269                 default:
 270                         usage();
 271                         break;
 272                 }
 273         }
 274
 275         getconfig(config_file, &defaultvol, &increment, wait_time_buf);
 276         if (!wait_time)
 277                 wait_time = *wait_time_buf ? wait_time_buf : "none";
 278
 279         argc -= optind;
 280         argv += optind;
 281
 282         if (argc == 0)          /* no frequency, on|off, or +|- given */
 283                 usage();
 284
 285         tuner_open(&tuner, device, index);
 286
 287         if (!strcmp(argv[0], "off")) {
 288                 tuner_set_mute(&tuner, true);
 289                 if (!quiet)
 290                         printf("Radio muted\n");
 291         } else if (!strcmp(argv[0], "on")) {
 292                 tuner_set_mute(&tuner, false);
 293                 if (!quiet) {
 294                         printf("Radio on");
 295                         print_volume(&tuner);
 296                         putchar('\n');
 297                 }
 298         } else if (!strcmp(argv[0], "+") || !strcmp(argv[0], "-")) {
 299                 double new_volume;
 300                 if (!tuner_has_volume_control(&tuner))
 301                         fatal(0, "Radio does not support volume control");
 302
 303                 new_volume = tuner_get_volume(&tuner);
 304                 if (argv[0][0] == '+')
 305                         new_volume += increment;
 306                 else
 307                         new_volume -= increment;
 308                 new_volume = clamp(new_volume);
 309
 310                 tuner_set_volume(&tuner, new_volume);
 311
 312                 if (!quiet) {
 313                         printf("Setting volume to %.2f%%", new_volume);
 314                         print_mute(&tuner);
 315                         putchar('\n');
 316                 }
 317         } else if (atof(argv[0])) {
 318                 double frequency = atof(argv[0]);
 319                 double volume = argc > 1 ? clamp(atof(argv[1])) : defaultvol;
 320                 tuner_set_freq(&tuner, frequency * 16000.0, override);
 321                 if (tuner_has_volume_control(&tuner))
 322                         tuner_set_volume(&tuner, volume);
 323                 if (!quiet) {
 324                         printf("Radio tuned to %2.2f MHz", frequency);
 325                         print_volume(&tuner);
 326                         print_mute(&tuner);
 327                         putchar('\n');
 328                 }
 329         } else {
 330                 fatal(0, "unrecognized command syntax; use --help for help");
 331         }
 332         maybe_sleep(&tuner, wait_time);
 333         tuner_close(&tuner);
 334         return 0;
 335 }