vss.c

   1 /*
   2  * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file vss.c the virtual streaming system
   8  *
   9  * This contains the audio streaming code of para_server which is independent
  10  * of the current audio format, audio file selector and of the activated
  11  * senders.
  12  */
  13
  14 #include "server.h"
  15 #include <sys/mman.h> /* mmap */
  16 #include <sys/time.h> /* gettimeofday */
  17 #include "server.cmdline.h"
  18 #include "afs.h"
  19 #include "vss.h"
  20 #include "send.h"
  21 #include "error.h"
  22 #include "string.h"
  23 #include "fd.h"
  24
  25 extern const char *status_item_list[];
  26
  27 static struct timeval announce_tv;
  28 static struct timeval data_send_barrier;
  29 static struct timeval eof_barrier;
  30 static struct timeval autoplay_barrier;
  31
  32 extern struct misc_meta_data *mmd;
  33 extern struct audio_file_selector selectors[];
  34 extern struct sender senders[];
  35
  36 static int audio_file;
  37 static char *map;
  38
  39 #if 1
  40         void mp3_init(struct audio_format_handler *);
  41 #endif
  42
  43 #ifdef HAVE_OGGVORBIS
  44         void ogg_init(struct audio_format_handler *);
  45 #endif
  46 #ifdef HAVE_FAAD
  47         void aac_afh_init(struct audio_format_handler *);
  48 #endif
  49
  50 /**
  51  * the list of supported  audio formats
  52  */
  53 static struct audio_format_handler afl[] = {
  54 #if 1
  55         {
  56                 .name = "mp3",
  57                 .init = mp3_init,
  58         },
  59 #endif
  60 #ifdef HAVE_OGGVORBIS
  61         {
  62                 .name = "ogg",
  63                 .init = ogg_init,
  64         },
  65 #endif
  66 #ifdef HAVE_FAAD
  67         {
  68                 .name = "aac",
  69                 .init = aac_afh_init,
  70         },
  71 #endif
  72         {
  73                 .name = NULL,
  74         }
  75 };
  76
  77 /** iterate over each supported audio format */
  78 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i++)
  79
  80
  81
  82 /**
  83  * check if vss status flag \a P (playing) is set
  84  *
  85  * \return greater than zero if playing, zero otherwise.
  86  *
  87  */
  88 unsigned int vss_playing(void)
  89 {
  90         return mmd->new_vss_status_flags & VSS_PLAYING;
  91 }
  92
  93 /**
  94  * check if \a N (next) status flag is set
  95  *
  96  * \return greater than zero if set, zero if not.
  97  *
  98  */
  99 unsigned int vss_next(void)
 100 {
 101         return mmd->new_vss_status_flags & VSS_NEXT;
 102 }
 103
 104 /**
 105  * check if a reposition request is pending
 106  *
 107  * \return greater than zero if true, zero otherwise.
 108  *
 109  */
 110 unsigned int vss_repos(void)
 111 {
 112         return mmd->new_vss_status_flags & VSS_REPOS;
 113 }
 114
 115 /**
 116  * check if the vss is currently paused
 117  *
 118  * \return greater than zero if paused, zero otherwise.
 119  *
 120  */
 121 unsigned int vss_paused(void)
 122 {
 123         return !(mmd->new_vss_status_flags & VSS_NEXT)
 124                 && !(mmd->new_vss_status_flags & VSS_PLAYING);
 125 }
 126
 127 /**
 128  * get the name of the given audio format
 129  * \param i the audio format number
 130  *
 131  * This returns a pointer to statically allocated memory so it
 132  * must not be freed by the caller.
 133  */
 134 const char *audio_format_name(int i)
 135 {
 136         return i >= 0?  afl[i].name : "(none)";
 137 }
 138
 139 /**
 140  * initialize the virtual streaming system
 141  *
 142  * Call the init functions of all supported audio format handlers and
 143  * initialize all supported senders.
 144  */
 145 void vss_init(void)
 146 {
 147         int i;
 148         char *hn = para_hostname(), *home = para_homedir();
 149         long unsigned announce_time = conf.announce_time_arg > 0?
 150                         conf.announce_time_arg : 300,
 151                 autoplay_delay = conf.autoplay_delay_arg > 0?
 152                         conf.autoplay_delay_arg : 0;
 153
 154         PARA_DEBUG_LOG("supported audio formats: %s\n",
 155                 SUPPORTED_AUDIO_FORMATS);
 156         for (i = 0; afl[i].name; i++) {
 157                 PARA_NOTICE_LOG("initializing %s handler\n",
 158                         afl[i].name);
 159                 afl[i].init(&afl[i]);
 160         }
 161         ms2tv(announce_time, &announce_tv);
 162         PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&announce_tv));
 163         for (i = 0; senders[i].name; i++) {
 164                 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
 165                 senders[i].init(&senders[i]);
 166         }
 167         free(hn);
 168         free(home);
 169         if (conf.autoplay_given) {
 170                 struct timeval now, tmp;
 171                 mmd->vss_status_flags |= VSS_PLAYING;
 172                 mmd->new_vss_status_flags |= VSS_PLAYING;
 173                 gettimeofday(&now, NULL);
 174                 ms2tv(autoplay_delay, &tmp);
 175                 tv_add(&now, &tmp, &autoplay_barrier);
 176         }
 177 }
 178
 179 static int get_file_info(int i)
 180 {
 181         return  afl[i].get_file_info(map, mmd->size, &mmd->afi);
 182 }
 183
 184 /**
 185  * guess the audio format judging from filename
 186  *
 187  * \param name the filename
 188  *
 189  * \return This function returns -1 if it has no idea what kind of audio
 190  * file this might be. Otherwise the (non-negative) number of the audio format
 191  * is returned.
 192  */
 193 int guess_audio_format(const char *name)
 194 {
 195         int i,j, len = strlen(name);
 196
 197         FOR_EACH_AUDIO_FORMAT(i) {
 198                 for (j = 0; afl[i].suffixes[j]; j++) {
 199                         const char *p = afl[i].suffixes[j];
 200                         int plen = strlen(p);
 201                         if (len < plen + 1)
 202                                 continue;
 203                         if (name[len - plen - 1] != '.')
 204                                 continue;
 205                         if (strcasecmp(name + len - plen, p))
 206                                 continue;
 207 //                      PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
 208                         return i;
 209                 }
 210         }
 211         return -1;
 212 }
 213
 214 static int get_audio_format(int omit)
 215 {
 216         int i;
 217
 218         FOR_EACH_AUDIO_FORMAT(i) {
 219                 if (i == omit)
 220                         continue;
 221                 if (get_file_info(i) > 0)
 222                         return i;
 223         }
 224         return -E_AUDIO_FORMAT;
 225 }
 226
 227 /*
 228  * upddate shared mem
 229  */
 230 static int update_mmd(void)
 231 {
 232         int i;
 233
 234         i = guess_audio_format(mmd->filename);
 235         if (i < 0 || get_file_info(i) < 0)
 236                 i = get_audio_format(i);
 237         if (i < 0)
 238                 return i;
 239         mmd->audio_format = i;
 240         mmd->chunks_sent = 0;
 241         mmd->current_chunk = 0;
 242         mmd->offset = 0;
 243         mmd->events++;
 244         return 1;
 245 }
 246
 247 static void vss_get_audio_file(void)
 248 {
 249         char **sl = selectors[mmd->selector_num].get_audio_file_list(10);
 250         int i;
 251         struct stat file_status;
 252
 253         if (!sl)
 254                 goto err_out;
 255         for (i = 0; sl[i]; i++) {
 256                 struct timeval now;
 257                 PARA_INFO_LOG("trying %s\n", sl[i]);
 258                 if (strlen(sl[i]) >= _POSIX_PATH_MAX)
 259                         continue;
 260                 audio_file = open(sl[i], O_RDONLY);
 261                 if (audio_file < 0)
 262                         continue;
 263                 if (fstat(audio_file, &file_status) == -1 ||
 264                                 !file_status.st_size) {
 265                         close(audio_file);
 266                         continue;
 267                 }
 268                 mmd->size = file_status.st_size;
 269                 mmd->mtime = file_status.st_mtime;
 270                 map = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE,
 271                         audio_file, 0);
 272                 strcpy(mmd->filename, sl[i]);
 273                 mmd->afi.header_len = 0; /* default: no header */
 274                 if (update_mmd() < 0) { /* invalid file */
 275                         close(audio_file);
 276                         munmap(map, mmd->size);
 277                         map = NULL;
 278                         continue;
 279                 }
 280                 mmd->num_played++;
 281                 if (selectors[mmd->selector_num].update_audio_file)
 282                         selectors[mmd->selector_num].update_audio_file(sl[i]);
 283                 PARA_NOTICE_LOG("next audio file: %s\n", mmd->filename);
 284                 mmd->new_vss_status_flags &= (~VSS_NEXT);
 285                 gettimeofday(&now, NULL);
 286                 tv_add(&now, &announce_tv, &data_send_barrier);
 287                 goto free;
 288         }
 289 err_out:
 290         PARA_ERROR_LOG("%s", "no valid files found\n");
 291         mmd->new_vss_status_flags = VSS_NEXT;
 292 free:
 293         if (sl) {
 294                 for (i = 0; sl[i]; i++)
 295                         free(sl[i]);
 296                 free(sl);
 297         }
 298 }
 299
 300 static int chk_barrier(const char *bname, const struct timeval *now,
 301                 const struct timeval *barrier, struct timeval *diff,
 302                 int print_log)
 303 {
 304         long ms;
 305
 306         if (tv_diff(now, barrier, diff) > 0)
 307                 return 1;
 308         ms = tv2ms(diff);
 309         if (print_log && ms)
 310                 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
 311         return -1;
 312 }
 313
 314 static void vss_next_chunk_time(struct timeval *due)
 315 {
 316         struct timeval tmp;
 317
 318         tv_scale(mmd->chunks_sent, &mmd->afi.chunk_tv, &tmp);
 319         tv_add(&tmp, &mmd->stream_start, due);
 320 }
 321
 322 /*
 323  * != NULL: timeout for next chunk
 324  * NULL: nothing to do
 325  */
 326 static struct timeval *vss_compute_timeout(void)
 327 {
 328         static struct timeval the_timeout;
 329         struct timeval now, next_chunk;
 330
 331         if (vss_next() && mmd->audio_format >= 0) {
 332                 /* only sleep a bit, nec*/
 333                 the_timeout.tv_sec = 0;
 334                 the_timeout.tv_usec = 100;
 335                 return &the_timeout;
 336         }
 337         gettimeofday(&now, NULL);
 338         if (chk_barrier("autoplay_delay", &now, &autoplay_barrier,
 339                         &the_timeout, 1) < 0)
 340                 return &the_timeout;
 341         if (chk_barrier("eof", &now, &eof_barrier, &the_timeout, 1) < 0)
 342                 return &the_timeout;
 343         if (chk_barrier("data send", &now, &data_send_barrier,
 344                         &the_timeout, 1) < 0)
 345                 return &the_timeout;
 346         if (mmd->audio_format < 0 || !vss_playing() || !map)
 347                 return NULL;
 348         vss_next_chunk_time(&next_chunk);
 349         if (chk_barrier(afl[mmd->audio_format].name, &now, &next_chunk,
 350                         &the_timeout, 0) < 0)
 351                 return &the_timeout;
 352         /* chunk is due or bof */
 353         the_timeout.tv_sec = 0;
 354         the_timeout.tv_usec = 0;
 355         return &the_timeout;
 356 }
 357
 358 static void vss_eof(void)
 359 {
 360         struct timeval now;
 361         int i;
 362         char *tmp;
 363
 364         if (!map) {
 365                 for (i = 0; senders[i].name; i++)
 366                         senders[i].shutdown_clients();
 367                 return;
 368         }
 369         gettimeofday(&now, NULL);
 370         tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
 371         munmap(map, mmd->size);
 372         map = NULL;
 373         close(audio_file);
 374         mmd->audio_format = -1;
 375         mmd->chunks_sent = 0;
 376         mmd->offset = 0;
 377         mmd->afi.seconds_total = 0;
 378         free(mmd->afi.chunk_table);
 379         mmd->afi.chunk_table = NULL;
 380         tmp  = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_INFO1],
 381                 status_item_list[SI_AUDIO_INFO2], status_item_list[SI_AUDIO_INFO3]);
 382         strcpy(mmd->afi.info_string, tmp);
 383         free(tmp);
 384         tmp  = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_DBINFO1],
 385                 status_item_list[SI_DBINFO2], status_item_list[SI_DBINFO3]);
 386         strcpy(mmd->selector_info, tmp);
 387         free(tmp);
 388         mmd->filename[0] = '\0';
 389         mmd->size = 0;
 390         mmd->events++;
 391 }
 392
 393 /**
 394  * get the header and of the current audio file
 395  *
 396  * \param header_len the length of the header is stored here
 397  *
 398  * \return a pointer to a buffer containing the header, or NULL, if no audio
 399  * file is selected or if the current audio format does not need special header
 400  * treamtment.
 401  *
 402  */
 403 char *vss_get_header(unsigned *header_len)
 404 {
 405         if (mmd->audio_format < 0 || !map || !mmd->afi.header_len)
 406                 return NULL;
 407         *header_len = mmd->afi.header_len;
 408         return map + mmd->afi.header_offset;
 409 }
 410
 411 /**
 412  * get the list of all supported audio formats
 413  *
 414  * \return a space separated list of all supported audio formats
 415  * It is not allocated at runtime, i.e. there is no need to free
 416  * the returned string in the caller.
 417  */
 418 const char *supported_audio_formats(void)
 419 {
 420         return SUPPORTED_AUDIO_FORMATS;
 421 }
 422
 423 /**
 424  * get the chunk time of the current audio file
 425  *
 426  * \return a pointer to a struct containing the chunk time, or NULL,
 427  * if currently no audio file is selected.
 428  */
 429 struct timeval *vss_chunk_time(void)
 430 {
 431         if (mmd->audio_format < 0)
 432                 return NULL;
 433         return &mmd->afi.chunk_tv;
 434 }
 435
 436 /**
 437  * compute the timeout for para_server's main select-loop
 438  *
 439  * This function gets called from para_server to determine the timeout value
 440  * for its main select loop.
 441  *
 442  * Before the timeout is computed, the current vss status flags are evaluated
 443  * and acted upon by calling appropriate functions from the lower layers.
 444  * Possible actions include
 445  *
 446  *      - request a new file list from the current audio file selector
 447  *      - shutdown of all senders (stop/pause command)
 448  *      - reposition the stream (ff/jmp command)
 449  *
 450  * \return A pointer to a struct timeval containing the timeout for the next
 451  * chunk of data to be sent, or NULL if we're not sending right now.
 452  */
 453 struct timeval *vss_preselect(void)
 454 {
 455         struct audio_format_handler *af = NULL;
 456         int i, format;
 457         struct timeval *ret;
 458 again:
 459         format = mmd->audio_format;
 460         if (format >= 0)
 461                 af = afl + format;
 462         else
 463                 for (i = 0; senders[i].name; i++)
 464                         senders[i].shutdown_clients();
 465         if (vss_next() && af) {
 466                 vss_eof();
 467                 return vss_compute_timeout();
 468         }
 469         if (vss_paused() || vss_repos()) {
 470                 for (i = 0; senders[i].name; i++)
 471                         senders[i].shutdown_clients();
 472                 if (af) {
 473                         struct timeval now;
 474                         gettimeofday(&now, NULL);
 475                         if (!vss_paused() || mmd->chunks_sent)
 476                                 tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
 477                         if (vss_repos())
 478                                 tv_add(&now, &announce_tv, &data_send_barrier);
 479                         if (mmd->new_vss_status_flags & VSS_NOMORE)
 480                                 mmd->new_vss_status_flags = VSS_NEXT;
 481                 }
 482                 mmd->chunks_sent = 0;
 483         }
 484         if (vss_repos()) {
 485                 mmd->new_vss_status_flags &= ~(VSS_REPOS);
 486                 mmd->current_chunk = mmd->repos_request;
 487         }
 488         ret = vss_compute_timeout();
 489         if (!ret && !map && vss_playing() &&
 490                         !(mmd->new_vss_status_flags & VSS_NOMORE)) {
 491                 PARA_DEBUG_LOG("%s", "ready and playing, but no audio file\n");
 492                 vss_get_audio_file();
 493                 goto again;
 494         }
 495         return ret;
 496 }
 497
 498 /**
 499  * main sending function
 500  *
 501  * This function gets called from para_server as soon as the next chunk of
 502  * data should be pushed out. It first calls the read_chunk() function of
 503  * the current audio format handler to obtain a pointer to the data to be
 504  * sent out as well as its length. This information is then passed to each
 505  * supported sender's send() function which does the actual sending.
 506  */
 507 void vss_send_chunk(void)
 508 {
 509         int i;
 510         struct audio_format_handler *af;
 511         ssize_t pos;
 512         size_t len;
 513         struct timeval now, due;
 514
 515         if (mmd->audio_format < 0 || !map || !vss_playing())
 516                 return;
 517         af = &afl[mmd->audio_format];
 518         gettimeofday(&now, NULL);
 519         vss_next_chunk_time(&due);
 520         if (tv_diff(&due, &now, NULL) > 0)
 521                 return;
 522         if (chk_barrier("eof", &now, &eof_barrier, &due, 1) < 0)
 523                 return;
 524         if (chk_barrier("data send", &now, &data_send_barrier,
 525                         &due, 1) < 0)
 526                 return;
 527         mmd->new_vss_status_flags &= ~VSS_REPOS;
 528         if (mmd->current_chunk >= mmd->afi.chunks_total) { /* eof */
 529                 mmd->new_vss_status_flags |= VSS_NEXT;
 530                 return vss_eof();
 531         }
 532         pos = mmd->afi.chunk_table[mmd->current_chunk];
 533         len = mmd->afi.chunk_table[mmd->current_chunk + 1] - pos;
 534         /*
 535          * We call the send function also in case of empty chunks as they
 536          * might have still some data queued which can be sent in this case.
 537          */
 538         if (!mmd->chunks_sent) {
 539                 struct timeval tmp;
 540                 gettimeofday(&mmd->stream_start, NULL);
 541                 tv_scale(mmd->current_chunk, &mmd->afi.chunk_tv, &tmp);
 542                 mmd->offset = tv2ms(&tmp);
 543                 mmd->events++;
 544         }
 545         for (i = 0; senders[i].name; i++)
 546                 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
 547                         map + pos, len);
 548         mmd->new_vss_status_flags |= VSS_PLAYING;
 549         mmd->chunks_sent++;
 550         mmd->current_chunk++;
 551 }