mixer.c

   1 /* Copyright (C) 1998 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
   2
   3 /** \file mixer.c A volume fader and alarm clock for OSS. */
   4
   5 #include <regex.h>
   6 #include <lopsub.h>
   7 #include <math.h>
   8
   9 #include "mixer.lsg.h"
  10 #include "para.h"
  11 #include "fd.h"
  12 #include "string.h"
  13 #include "mix.h"
  14 #include "error.h"
  15 #include "version.h"
  16
  17 /** Array of error strings. */
  18 DEFINE_PARA_ERRLIST;
  19
  20 /* At least one of the two is defined if this file gets compiled. */
  21 static const struct mixer *mixers[] = {
  22 #ifdef HAVE_ALSA
  23         &alsa_mixer,
  24 #endif
  25 #ifdef HAVE_OSS
  26         &oss_mixer,
  27 #endif
  28 };
  29
  30 #define NUM_SUPPORTED_MIXERS (ARRAY_SIZE(mixers))
  31 #define FOR_EACH_MIXER(i) for ((i) = 0; (i) < NUM_SUPPORTED_MIXERS; (i)++)
  32
  33 static struct lls_parse_result *lpr, *sub_lpr;
  34
  35 #define CMD_PTR(_cmd) (lls_cmd(LSG_MIXER_CMD_ ## _cmd, mixer_suite))
  36 #define OPT_RESULT(_cmd, _opt) (lls_opt_result( \
  37         LSG_MIXER_ ## _cmd ## _OPT_ ## _opt, (LSG_MIXER_CMD_ ## _cmd == 0)? lpr : sub_lpr))
  38 #define OPT_GIVEN(_cmd, _opt) (lls_opt_given(OPT_RESULT(_cmd, _opt)))
  39 #define OPT_STRING_VAL(_cmd, _opt) (lls_string_val(0, OPT_RESULT(_cmd, _opt)))
  40 #define OPT_UINT32_VAL(_cmd, _opt) (lls_uint32_val(0, OPT_RESULT(_cmd, _opt)))
  41
  42 typedef int (*mixer_subcommand_handler_t)(const struct mixer *, struct mixer_handle *);
  43
  44 #define EXPORT_CMD(_cmd) const mixer_subcommand_handler_t \
  45         lsg_mixer_com_ ## _cmd ## _user_data = &com_ ## _cmd;
  46
  47 static int loglevel;
  48 static __printf_2_3 void date_log(int ll, const char *fmt, ...)
  49 {
  50         va_list argp;
  51         time_t t1;
  52         struct tm *tm;
  53
  54         if (ll < loglevel)
  55                 return;
  56         time(&t1);
  57         tm = localtime(&t1);
  58         fprintf(stderr, "%d:%02d:%02d ", tm->tm_hour, tm->tm_min, tm->tm_sec);
  59         va_start(argp, fmt);
  60         vprintf(fmt, argp);
  61         va_end(argp);
  62 }
  63 __printf_2_3 void (*para_log)(int, const char*, ...) = date_log;
  64
  65 static int set_channel(const struct mixer *m, struct mixer_handle *h,
  66                 const char *channel)
  67 {
  68
  69         PARA_NOTICE_LOG("using %s mixer channel\n", channel?
  70                 channel : "default");
  71         return m->set_channel(h, channel);
  72 }
  73
  74 static void millisleep(int ms)
  75 {
  76         struct timespec ts;
  77
  78         PARA_INFO_LOG("sleeping %dms\n", ms);
  79         if (ms < 0)
  80                 return;
  81         ts.tv_sec = ms / 1000,
  82         ts.tv_nsec = (ms % 1000) * 1000 * 1000;
  83         nanosleep(&ts, NULL);
  84 }
  85
  86 /*
  87  * This implements the inverse function of t -> t^alpha, scaled to the time
  88  * interval [0,T] and the range given by old_vol and new_vol. It returns the
  89  * amount of milliseconds until the given volume is reached.
  90  */
  91 static unsigned volume_time(double vol, double old_vol, double new_vol,
  92                 double T, double alpha)
  93 {
  94         double c, d, x;
  95
  96         if (old_vol < new_vol) {
  97                 c = old_vol;
  98                 d = new_vol;
  99         } else {
 100                 c = new_vol;
 101                 d = old_vol;
 102         }
 103
 104         x = T * exp(log(((vol - c) / (d - c))) / alpha);
 105         assert(x <= T);
 106         if (old_vol < new_vol)
 107                 return x;
 108         else
 109                 return T - x;
 110 }
 111
 112 /* Fade to new volume in fade_time seconds. */
 113 static int fade(const struct mixer *m, struct mixer_handle *h, uint32_t new_vol,
 114                 uint32_t fade_time)
 115 {
 116         int i, T, old_vol, ret, slept, incr;
 117         double ms, alpha;
 118         uint32_t fe = OPT_UINT32_VAL(PARA_MIXER, FADE_EXPONENT);
 119
 120         if (fade_time <= 0 || fe >= 100) {
 121                 ret = m->set(h, new_vol);
 122                 if (ret < 0)
 123                         return ret;
 124                 goto sleep;
 125         }
 126         alpha = (100 - fe) / 100.0;
 127         ret = m->get(h);
 128         if (ret < 0)
 129                 return ret;
 130         old_vol = ret;
 131         if (old_vol == new_vol)
 132                 goto sleep;
 133         PARA_NOTICE_LOG("fading %s from %d to %u in %u seconds\n",
 134                 OPT_STRING_VAL(PARA_MIXER, MIXER_CHANNEL), old_vol,
 135                 new_vol, fade_time);
 136         incr = old_vol < new_vol? 1 : -1;
 137         T = fade_time * 1000;
 138         i = old_vol;
 139         slept = 0;
 140         do {
 141                 ms = volume_time(i + incr, old_vol, new_vol, T, alpha);
 142                 millisleep(ms - slept);
 143                 slept = ms;
 144                 i += incr;
 145                 ret = m->set(h, i);
 146                 if (ret < 0)
 147                         return ret;
 148         } while (i != new_vol);
 149         return 1;
 150 sleep:
 151         sleep(fade_time);
 152         return ret;
 153 }
 154
 155 static int com_fade(const struct mixer *m, struct mixer_handle *h)
 156 {
 157         uint32_t new_vol = OPT_UINT32_VAL(FADE, FADE_VOL);
 158         uint32_t fade_time = OPT_UINT32_VAL(FADE, FADE_TIME);
 159         return fade(m, h, new_vol, fade_time);
 160 }
 161 EXPORT_CMD(fade);
 162
 163 static void client_cmd(const char *cmd)
 164 {
 165         int ret, status, fds[3] = {0, 0, 0};
 166         pid_t pid;
 167         char *cmdline = make_message(BINDIR "/para_client %s", cmd);
 168
 169         PARA_NOTICE_LOG("%s\n", cmdline);
 170         ret = para_exec_cmdline_pid(&pid, cmdline, fds);
 171         free(cmdline);
 172         if (ret < 0) {
 173                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 174                 goto fail;
 175         }
 176         do
 177                 pid = waitpid(pid, &status, 0);
 178         while (pid == -1 && errno == EINTR);
 179         if (pid < 0) {
 180                 PARA_ERROR_LOG("%s\n", strerror(errno));
 181                 goto fail;
 182         }
 183         if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
 184                 goto fail;
 185         return;
 186 fail:
 187         PARA_EMERG_LOG("command \"%s\" failed\n", cmd);
 188         exit(EXIT_FAILURE);
 189 }
 190
 191 static void change_afs_mode(const char *afs_mode)
 192 {
 193         char *cmd;
 194
 195         client_cmd("stop");
 196         if (!afs_mode)
 197                 return;
 198         cmd = make_message("select %s", afs_mode);
 199         client_cmd(cmd);
 200         free(cmd);
 201 }
 202
 203 static int set_initial_volume(const struct mixer *m, struct mixer_handle *h)
 204 {
 205         int i, ret;
 206
 207         for (i = 0; i < OPT_GIVEN(SLEEP, IVOL); i++) {
 208                 const char *val = lls_string_val(i, OPT_RESULT(SLEEP, IVOL));
 209                 char *p, *ch, *arg = para_strdup(val);
 210                 int32_t iv;
 211                 p = strchr(arg, ':');
 212                 if (p) {
 213                         *p = '\0';
 214                         p++;
 215                         ch = arg;
 216                 } else {
 217                         p = arg;
 218                         ch = NULL;
 219                 }
 220                 ret = para_atoi32(p, &iv);
 221                 if (ret < 0) {
 222                         free(arg);
 223                         return ret;
 224                 }
 225                 ret = set_channel(m, h, ch);
 226                 if (!ch)
 227                         ch = "default";
 228                 if (ret < 0) {
 229                         PARA_WARNING_LOG("ignoring channel %s\n", ch);
 230                         ret = 0;
 231                 } else {
 232                         PARA_INFO_LOG("initial volume %s: %d\n", ch, iv);
 233                         ret = m->set(h, iv);
 234                 }
 235                 free(arg);
 236                 if (ret < 0)
 237                         return ret;
 238         }
 239         return 1;
 240 }
 241
 242 static int com_sleep(const struct mixer *m, struct mixer_handle *h)
 243 {
 244         time_t t1, wake_time_epoch;
 245         unsigned int delay;
 246         struct tm *tm;
 247         int ret;
 248         const char *wake_time = OPT_STRING_VAL(SLEEP, WAKE_TIME);
 249         const char *fo_mood = OPT_STRING_VAL(SLEEP, FO_MOOD);
 250         const char *fi_mood = OPT_STRING_VAL(SLEEP, FI_MOOD);
 251         const char *sleep_mood = OPT_STRING_VAL(SLEEP, SLEEP_MOOD);
 252         int fit = OPT_UINT32_VAL(SLEEP, FI_TIME);
 253         int fot = OPT_UINT32_VAL(SLEEP, FO_TIME);
 254         int fiv = OPT_UINT32_VAL(SLEEP, FI_VOL);
 255         int fov = OPT_UINT32_VAL(SLEEP, FO_VOL);
 256         int32_t hour, min = 0;
 257         char *tmp;
 258         char *wt = para_strdup(wake_time + (wake_time[0] == '+'));
 259
 260         /* calculate wake time */
 261         time(&t1);
 262         tmp = strchr(wt, ':');
 263         if (tmp) {
 264                 *tmp = '\0';
 265                 tmp++;
 266                 ret = para_atoi32(tmp, &min);
 267                 if (ret < 0) {
 268                         free(wt);
 269                         return ret;
 270                 }
 271         }
 272         ret = para_atoi32(wt, &hour);
 273         free(wt);
 274         if (ret < 0)
 275                 return ret;
 276         if (wake_time[0] == '+') { /* relative */
 277                 t1 += hour * 60 * 60 + min * 60;
 278                 tm = localtime(&t1);
 279         } else {
 280                 tm = localtime(&t1);
 281                 if (tm->tm_hour > hour || (tm->tm_hour == hour && tm->tm_min> min)) {
 282                         t1 += 86400; /* wake time is tomorrow */
 283                         tm = localtime(&t1);
 284                 }
 285                 tm->tm_hour = hour;
 286                 tm->tm_min = min;
 287                 tm->tm_sec = 0;
 288         }
 289         wake_time_epoch = mktime(tm);
 290         PARA_INFO_LOG("waketime: %d:%02d\n", tm->tm_hour, tm->tm_min);
 291         client_cmd("stop");
 292         sleep(1);
 293         if (fot) {
 294                 ret = set_initial_volume(m, h);
 295                 if (ret < 0)
 296                         return ret;
 297                 change_afs_mode(fo_mood);
 298                 client_cmd("play");
 299                 ret = set_channel(m, h, OPT_STRING_VAL(PARA_MIXER, MIXER_CHANNEL));
 300                 if (ret < 0)
 301                         return ret;
 302                 ret = fade(m, h, fov, fot);
 303                 if (ret < 0)
 304                         return ret;
 305         } else {
 306                 ret = m->set(h, fov);
 307                 if (ret < 0)
 308                         return ret;
 309         }
 310         if (OPT_GIVEN(SLEEP, SLEEP_MOOD)) {
 311                 change_afs_mode(sleep_mood);
 312                 client_cmd("play");
 313         } else
 314                 client_cmd("stop");
 315         if (!fit)
 316                 return 1;
 317         change_afs_mode(fi_mood);
 318         for (;;) {
 319                 time(&t1);
 320                 if (wake_time_epoch <= t1 + fit)
 321                         break;
 322                 delay = wake_time_epoch - t1 - fit;
 323                 PARA_INFO_LOG("sleeping %u seconds (%u:%02u)\n",
 324                         delay, delay / 3600,
 325                         (delay % 3600) / 60);
 326                 sleep(delay);
 327         }
 328         client_cmd("play");
 329         ret = fade(m, h, fiv, fit);
 330         PARA_INFO_LOG("fade complete, returning\n");
 331         return ret;
 332 }
 333 EXPORT_CMD(sleep);
 334
 335 static int com_snooze(const struct mixer *m, struct mixer_handle *h)
 336 {
 337         int ret, val;
 338
 339         if (OPT_UINT32_VAL(SNOOZE, SO_TIME) == 0)
 340                 return 1;
 341         ret = m->get(h);
 342         if (ret < 0)
 343                 return ret;
 344         val = ret;
 345         if (val < OPT_UINT32_VAL(SNOOZE, SO_VOL))
 346                 ret = m->set(h, OPT_UINT32_VAL(SNOOZE, SO_VOL));
 347         else
 348                 ret = fade(m, h, OPT_UINT32_VAL(SNOOZE, SO_VOL),
 349                         OPT_UINT32_VAL(SNOOZE, SO_TIME));
 350         if (ret < 0)
 351                 return ret;
 352         client_cmd("pause");
 353         PARA_NOTICE_LOG("%" PRIu32 " seconds snooze time...\n",
 354                 OPT_UINT32_VAL(SNOOZE, SNOOZE_TIME));
 355         sleep(OPT_UINT32_VAL(SNOOZE, SNOOZE_TIME));
 356         client_cmd("play");
 357         return fade(m, h, OPT_UINT32_VAL(SNOOZE, SI_VOL),
 358                 OPT_UINT32_VAL(SNOOZE, SI_TIME));
 359 }
 360 EXPORT_CMD(snooze);
 361
 362 static int com_set(const struct mixer *m, struct mixer_handle *h)
 363 {
 364         return m->set(h, OPT_UINT32_VAL(SET, VAL));
 365 }
 366 EXPORT_CMD(set);
 367
 368 static const struct mixer *get_mixer_or_die(void)
 369 {
 370         int i;
 371
 372         if (!OPT_GIVEN(PARA_MIXER, MIXER_API))
 373                 i = 0; /* default: use first mixer */
 374         else
 375                 FOR_EACH_MIXER(i)
 376                         if (!strcmp(mixers[i]->name,
 377                                         OPT_STRING_VAL(PARA_MIXER, MIXER_API)))
 378                                 break;
 379         if (i < NUM_SUPPORTED_MIXERS) {
 380                 PARA_NOTICE_LOG("using %s mixer API\n", mixers[i]->name);
 381                 return mixers[i];
 382         }
 383         printf("available mixer APIs: ");
 384         FOR_EACH_MIXER(i)
 385                 printf("%s%s%s ", i == 0? "[" : "", mixers[i]->name,
 386                         i == 0? "]" : "");
 387         printf("\n");
 388         exit(EXIT_FAILURE);
 389 }
 390
 391 static void show_subcommands(void)
 392 {
 393         const struct lls_command *cmd;
 394         int i;
 395         printf("Subcommands:\n");
 396         for (i = 1; (cmd = lls_cmd(i, mixer_suite)); i++) {
 397                 const char *name = lls_command_name(cmd);
 398                 const char *purpose = lls_purpose(cmd);
 399                 printf("%-20s%s\n", name, purpose);
 400         }
 401 }
 402
 403
 404 static int com_help(__a_unused const struct mixer *m,
 405                 __a_unused struct mixer_handle *h)
 406 {
 407         const struct lls_command *cmd;
 408         const struct lls_opt_result *r_l = OPT_RESULT(HELP, LONG);
 409         char *txt, *errctx;
 410         const char *name;
 411         int ret;
 412
 413         ret = lls_check_arg_count(sub_lpr, 0, 1, NULL);
 414         if (ret < 0)
 415                 return ret;
 416         if (lls_num_inputs(sub_lpr) == 0) {
 417                 show_subcommands();
 418                 return 0;
 419         }
 420         name = lls_input(0, sub_lpr);
 421         ret = lls(lls_lookup_subcmd(name, mixer_suite, &errctx));
 422         if (ret < 0) {
 423                 if (errctx)
 424                         PARA_ERROR_LOG("%s\n", errctx);
 425                 free(errctx);
 426                 return ret;
 427         }
 428         cmd = lls_cmd(ret, mixer_suite);
 429         if (lls_opt_given(r_l))
 430                 txt = lls_long_help(cmd);
 431         else
 432                 txt = lls_short_help(cmd);
 433         printf("%s", txt);
 434         free(txt);
 435         return 0;
 436 }
 437 EXPORT_CMD(help);
 438
 439 static void handle_help_flags(void)
 440 {
 441         char *help;
 442
 443         if (OPT_GIVEN(PARA_MIXER, DETAILED_HELP))
 444                 help = lls_long_help(CMD_PTR(PARA_MIXER));
 445         else if (OPT_GIVEN(PARA_MIXER, HELP))
 446                 help = lls_short_help(CMD_PTR(PARA_MIXER));
 447         else
 448                 return;
 449         printf("%s", help);
 450         free(help);
 451         show_subcommands();
 452         exit(EXIT_SUCCESS);
 453 }
 454
 455 static int parse_and_merge_config_file(const struct lls_command *cmd)
 456 {
 457         int ret;
 458         int cf_argc;
 459         char **cf_argv;
 460         char *cf, *errctx = NULL;
 461         struct lls_parse_result **lprp, *cf_lpr, *merged_lpr;
 462         void *map;
 463         size_t sz;
 464         const char *subcmd_name;
 465
 466         if (cmd == lls_cmd(0, mixer_suite)) {
 467                 lprp = &lpr;
 468                 subcmd_name = NULL;
 469         } else {
 470                 lprp = &sub_lpr;
 471                 subcmd_name = lls_command_name(cmd);
 472         }
 473         if (OPT_GIVEN(PARA_MIXER, CONFIG_FILE))
 474                 cf = para_strdup(OPT_STRING_VAL(PARA_MIXER, CONFIG_FILE));
 475         else {
 476                 char *home = para_homedir();
 477                 cf = make_message("%s/.paraslash/mixer.conf", home);
 478                 free(home);
 479         }
 480         ret = mmap_full_file(cf, O_RDONLY, &map, &sz, NULL);
 481         if (ret < 0) {
 482                 if (ret != -E_EMPTY && ret != -ERRNO_TO_PARA_ERROR(ENOENT))
 483                         goto free_cf;
 484                 if (ret == -ERRNO_TO_PARA_ERROR(ENOENT) &&
 485                                 OPT_GIVEN(PARA_MIXER, CONFIG_FILE))
 486                         goto free_cf;
 487         } else {
 488                 ret = lls(lls_convert_config(map, sz, subcmd_name, &cf_argv, &errctx));
 489                 para_munmap(map, sz);
 490                 if (ret < 0)
 491                         goto free_cf;
 492                 cf_argc = ret;
 493                 ret = lls(lls_parse(cf_argc, cf_argv, cmd, &cf_lpr, &errctx));
 494                 lls_free_argv(cf_argv);
 495                 if (ret < 0)
 496                         goto free_cf;
 497                 ret = lls(lls_merge(*lprp, cf_lpr, cmd, &merged_lpr, &errctx));
 498                 lls_free_parse_result(cf_lpr, cmd);
 499                 if (ret < 0)
 500                         goto free_cf;
 501                 lls_free_parse_result(*lprp, cmd);
 502                 *lprp = merged_lpr;
 503                 loglevel = OPT_UINT32_VAL(PARA_MIXER, LOGLEVEL);
 504         }
 505         ret = 1;
 506 free_cf:
 507         free(cf);
 508         if (errctx)
 509                 PARA_ERROR_LOG("%s\n", errctx);
 510         free(errctx);
 511         return ret;
 512 }
 513
 514 /**
 515  * The main function of para_mixer.
 516  *
 517  * The executable is linked with the alsa or the oss mixer API, or both. It has
 518  * a custom log function which prefixes log messages with the current date.
 519  *
 520  * \param argc Argument counter.
 521  * \param argv Argument vector.
 522  *
 523  * \return EXIT_SUCCESS or EXIT_FAILURE.
 524  */
 525 int main(int argc, char *argv[])
 526 {
 527         const struct lls_command *cmd = CMD_PTR(PARA_MIXER);
 528         int ret;
 529         char *errctx;
 530         const char *subcmd;
 531         const struct mixer *m;
 532         struct mixer_handle *h;
 533         unsigned n;
 534
 535         ret = lls(lls_parse(argc, argv, cmd, &lpr, &errctx));
 536         if (ret < 0)
 537                 goto fail;
 538         loglevel = OPT_UINT32_VAL(PARA_MIXER, LOGLEVEL);
 539         version_handle_flag("mixer", OPT_GIVEN(PARA_MIXER, VERSION));
 540         handle_help_flags();
 541
 542         n = lls_num_inputs(lpr);
 543         if (n == 0) {
 544                 show_subcommands();
 545                 ret = 0;
 546                 goto free_lpr;
 547         }
 548         ret = parse_and_merge_config_file(cmd);
 549         if (ret < 0)
 550                 goto free_lpr;
 551         subcmd = lls_input(0, lpr);
 552         ret = lls(lls_lookup_subcmd(subcmd, mixer_suite, &errctx));
 553         if (ret < 0)
 554                 goto fail;
 555         cmd = lls_cmd(ret, mixer_suite);
 556         ret = lls(lls_parse(n, argv + argc - n, cmd, &sub_lpr, &errctx));
 557         if (ret < 0)
 558                 goto free_lpr;
 559         ret = parse_and_merge_config_file(cmd);
 560         if (ret < 0)
 561                 goto free_lpr;
 562         m = get_mixer_or_die();
 563         ret = m->open(OPT_STRING_VAL(PARA_MIXER, MIXER_DEVICE), &h);
 564         if (ret < 0)
 565                 goto free_sub_lpr;
 566         ret = set_channel(m, h, OPT_STRING_VAL(PARA_MIXER, MIXER_CHANNEL));
 567         if (ret == -E_BAD_CHANNEL) {
 568                 char *channels = m->get_channels(h);
 569                 printf("Available channels: %s\n", channels);
 570                 free(channels);
 571         }
 572         if (ret < 0)
 573                 goto close_mixer;
 574         ret = (*(mixer_subcommand_handler_t *)(lls_user_data(cmd)))(m ,h);
 575 close_mixer:
 576         m->close(&h);
 577 free_sub_lpr:
 578         lls_free_parse_result(sub_lpr, cmd);
 579 free_lpr:
 580         lls_free_parse_result(lpr, CMD_PTR(PARA_MIXER));
 581         if (ret >= 0)
 582                 return EXIT_SUCCESS;
 583 fail:
 584         if (errctx)
 585                 PARA_ERROR_LOG("%s\n", errctx);
 586         free(errctx);
 587         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 588         return EXIT_FAILURE;
 589 }