vss.c

   1 /*
   2  * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file vss.c the virtual streaming system
  20  *
  21  * This contains the audio streaming code of para_server which is independent
  22  * of the current audio format, audio file selector and of the activated
  23  * senders.
  24  */
  25
  26 #include "server.h"
  27 #include <sys/mman.h> /* mmap */
  28 #include <sys/time.h> /* gettimeofday */
  29 #include "server.cmdline.h"
  30 #include "afs.h"
  31 #include "vss.h"
  32 #include "send.h"
  33 #include "error.h"
  34 #include "string.h"
  35 #include "fd.h"
  36
  37 extern const char *status_item_list[];
  38
  39 static struct timeval announce_tv;
  40 static struct timeval data_send_barrier;
  41 static struct timeval eof_barrier;
  42 static struct timeval autoplay_barrier;
  43
  44 extern struct misc_meta_data *mmd;
  45 extern struct audio_file_selector selectors[];
  46 extern struct sender senders[];
  47
  48 static int audio_file;
  49 static char *map;
  50
  51 #if 1
  52         void mp3_init(struct audio_format_handler *);
  53 #endif
  54
  55 #ifdef HAVE_OGGVORBIS
  56         void ogg_init(struct audio_format_handler *);
  57 #endif
  58 #ifdef HAVE_FAAD
  59         void aac_afh_init(struct audio_format_handler *);
  60 #endif
  61
  62 /**
  63  * the list of supported  audio formats
  64  */
  65 static struct audio_format_handler afl[] = {
  66 #if 1
  67         {
  68                 .name = "mp3",
  69                 .init = mp3_init,
  70         },
  71 #endif
  72 #ifdef HAVE_OGGVORBIS
  73         {
  74                 .name = "ogg",
  75                 .init = ogg_init,
  76         },
  77 #endif
  78 #ifdef HAVE_FAAD
  79         {
  80                 .name = "aac",
  81                 .init = aac_afh_init,
  82         },
  83 #endif
  84         {
  85                 .name = NULL,
  86         }
  87 };
  88
  89 /** iterate over each supported audio format */
  90 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i++)
  91
  92
  93
  94 /**
  95  * check if vss status flag \a P (playing) is set
  96  *
  97  * \return greater than zero if playing, zero otherwise.
  98  *
  99  */
 100 unsigned int vss_playing(void)
 101 {
 102         return mmd->new_vss_status_flags & VSS_PLAYING;
 103 }
 104
 105 /**
 106  * check if \a N (next) status flag is set
 107  *
 108  * \return greater than zero if set, zero if not.
 109  *
 110  */
 111 unsigned int vss_next(void)
 112 {
 113         return mmd->new_vss_status_flags & VSS_NEXT;
 114 }
 115
 116 /**
 117  * check if a reposition request is pending
 118  *
 119  * \return greater than zero if true, zero otherwise.
 120  *
 121  */
 122 unsigned int vss_repos(void)
 123 {
 124         return mmd->new_vss_status_flags & VSS_REPOS;
 125 }
 126
 127 /**
 128  * check if the vss is currently paused
 129  *
 130  * \return greater than zero if paused, zero otherwise.
 131  *
 132  */
 133 unsigned int vss_paused(void)
 134 {
 135         return !(mmd->new_vss_status_flags & VSS_NEXT)
 136                 && !(mmd->new_vss_status_flags & VSS_PLAYING);
 137 }
 138
 139 /**
 140  * get the name of the given audio format
 141  * \param i the audio format number
 142  *
 143  * This returns a pointer to statically allocated memory so it
 144  * must not be freed by the caller.
 145  */
 146 const char *audio_format_name(int i)
 147 {
 148         return i >= 0?  afl[i].name : "(none)";
 149 }
 150
 151 /**
 152  * initialize the virtual streaming system
 153  *
 154  * Call the init functions of all supported audio format handlers and
 155  * initialize all supported senders.
 156  */
 157 void vss_init(void)
 158 {
 159         int i;
 160         char *hn = para_hostname(), *home = para_homedir();
 161         long unsigned announce_time = conf.announce_time_arg > 0?
 162                         conf.announce_time_arg : 300,
 163                 autoplay_delay = conf.autoplay_delay_arg > 0?
 164                         conf.autoplay_delay_arg : 0;
 165
 166         PARA_DEBUG_LOG("supported audio formats: %s\n",
 167                 SUPPORTED_AUDIO_FORMATS);
 168         for (i = 0; afl[i].name; i++) {
 169                 PARA_NOTICE_LOG("initializing %s handler\n",
 170                         afl[i].name);
 171                 afl[i].init(&afl[i]);
 172         }
 173         ms2tv(announce_time, &announce_tv);
 174         PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&announce_tv));
 175         for (i = 0; senders[i].name; i++) {
 176                 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
 177                 senders[i].init(&senders[i]);
 178         }
 179         free(hn);
 180         free(home);
 181         if (conf.autoplay_given) {
 182                 struct timeval now, tmp;
 183                 mmd->vss_status_flags |= VSS_PLAYING;
 184                 mmd->new_vss_status_flags |= VSS_PLAYING;
 185                 gettimeofday(&now, NULL);
 186                 ms2tv(autoplay_delay, &tmp);
 187                 tv_add(&now, &tmp, &autoplay_barrier);
 188         }
 189 }
 190
 191 static int get_file_info(int i)
 192 {
 193         return  afl[i].get_file_info(map, mmd->size, &mmd->afi);
 194 }
 195
 196 /**
 197  * guess the audio format judging from filename
 198  *
 199  * \param name the filename
 200  *
 201  * \return This function returns -1 if it has no idea what kind of audio
 202  * file this might be. Otherwise the (non-negative) number of the audio format
 203  * is returned.
 204  */
 205 int guess_audio_format(const char *name)
 206 {
 207         int i,j, len = strlen(name);
 208
 209         FOR_EACH_AUDIO_FORMAT(i) {
 210                 for (j = 0; afl[i].suffixes[j]; j++) {
 211                         const char *p = afl[i].suffixes[j];
 212                         int plen = strlen(p);
 213                         if (len < plen + 1)
 214                                 continue;
 215                         if (name[len - plen - 1] != '.')
 216                                 continue;
 217                         if (strcasecmp(name + len - plen, p))
 218                                 continue;
 219 //                      PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
 220                         return i;
 221                 }
 222         }
 223         return -1;
 224 }
 225
 226 static int get_audio_format(int omit)
 227 {
 228         int i;
 229
 230         FOR_EACH_AUDIO_FORMAT(i) {
 231                 if (i == omit)
 232                         continue;
 233                 if (get_file_info(i) > 0)
 234                         return i;
 235         }
 236         return -E_AUDIO_FORMAT;
 237 }
 238
 239 /*
 240  * upddate shared mem
 241  */
 242 static int update_mmd(void)
 243 {
 244         int i;
 245
 246         i = guess_audio_format(mmd->filename);
 247         if (i < 0 || get_file_info(i) < 0)
 248                 i = get_audio_format(i);
 249         if (i < 0)
 250                 return i;
 251         mmd->audio_format = i;
 252         mmd->chunks_sent = 0;
 253         mmd->current_chunk = 0;
 254         mmd->offset = 0;
 255         mmd->events++;
 256         return 1;
 257 }
 258
 259 static void vss_get_audio_file(void)
 260 {
 261         char **sl = selectors[mmd->selector_num].get_audio_file_list(10);
 262         int i;
 263         struct stat file_status;
 264
 265         if (!sl)
 266                 goto err_out;
 267         for (i = 0; sl[i]; i++) {
 268                 struct timeval now;
 269                 PARA_INFO_LOG("trying %s\n", sl[i]);
 270                 if (strlen(sl[i]) >= _POSIX_PATH_MAX)
 271                         continue;
 272                 audio_file = open(sl[i], O_RDONLY);
 273                 if (audio_file < 0)
 274                         continue;
 275                 if (fstat(audio_file, &file_status) == -1 ||
 276                                 !file_status.st_size) {
 277                         close(audio_file);
 278                         continue;
 279                 }
 280                 mmd->size = file_status.st_size;
 281                 mmd->mtime = file_status.st_mtime;
 282                 map = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE,
 283                         audio_file, 0);
 284                 strcpy(mmd->filename, sl[i]);
 285                 mmd->afi.header_len = 0; /* default: no header */
 286                 if (update_mmd() < 0) { /* invalid file */
 287                         close(audio_file);
 288                         munmap(map, mmd->size);
 289                         map = NULL;
 290                         continue;
 291                 }
 292                 mmd->num_played++;
 293                 if (selectors[mmd->selector_num].update_audio_file)
 294                         selectors[mmd->selector_num].update_audio_file(sl[i]);
 295                 PARA_NOTICE_LOG("next audio file: %s\n", mmd->filename);
 296                 mmd->new_vss_status_flags &= (~VSS_NEXT);
 297                 gettimeofday(&now, NULL);
 298                 tv_add(&now, &announce_tv, &data_send_barrier);
 299                 goto free;
 300         }
 301 err_out:
 302         PARA_ERROR_LOG("%s", "no valid files found\n");
 303         mmd->new_vss_status_flags = VSS_NEXT;
 304 free:
 305         if (sl) {
 306                 for (i = 0; sl[i]; i++)
 307                         free(sl[i]);
 308                 free(sl);
 309         }
 310 }
 311
 312 static int chk_barrier(const char *bname, const struct timeval *now,
 313                 const struct timeval *barrier, struct timeval *diff,
 314                 int print_log)
 315 {
 316         long ms;
 317
 318         if (tv_diff(now, barrier, diff) > 0)
 319                 return 1;
 320         ms = tv2ms(diff);
 321         if (print_log && ms)
 322                 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
 323         return -1;
 324 }
 325
 326 static void vss_next_chunk_time(struct timeval *due)
 327 {
 328         struct timeval tmp;
 329
 330         tv_scale(mmd->chunks_sent, &mmd->afi.chunk_tv, &tmp);
 331         tv_add(&tmp, &mmd->stream_start, due);
 332 }
 333
 334 /*
 335  * != NULL: timeout for next chunk
 336  * NULL: nothing to do
 337  */
 338 static struct timeval *vss_compute_timeout(void)
 339 {
 340         static struct timeval the_timeout;
 341         struct timeval now, next_chunk;
 342
 343         if (vss_next() && mmd->audio_format >= 0) {
 344                 /* only sleep a bit, nec*/
 345                 the_timeout.tv_sec = 0;
 346                 the_timeout.tv_usec = 100;
 347                 return &the_timeout;
 348         }
 349         gettimeofday(&now, NULL);
 350         if (chk_barrier("autoplay_delay", &now, &autoplay_barrier,
 351                         &the_timeout, 1) < 0)
 352                 return &the_timeout;
 353         if (chk_barrier("eof", &now, &eof_barrier, &the_timeout, 1) < 0)
 354                 return &the_timeout;
 355         if (chk_barrier("data send", &now, &data_send_barrier,
 356                         &the_timeout, 1) < 0)
 357                 return &the_timeout;
 358         if (mmd->audio_format < 0 || !vss_playing() || !map)
 359                 return NULL;
 360         vss_next_chunk_time(&next_chunk);
 361         if (chk_barrier(afl[mmd->audio_format].name, &now, &next_chunk,
 362                         &the_timeout, 0) < 0)
 363                 return &the_timeout;
 364         /* chunk is due or bof */
 365         the_timeout.tv_sec = 0;
 366         the_timeout.tv_usec = 0;
 367         return &the_timeout;
 368 }
 369
 370 static void vss_eof(void)
 371 {
 372         struct timeval now;
 373         int i;
 374         char *tmp;
 375
 376         if (!map) {
 377                 for (i = 0; senders[i].name; i++)
 378                         senders[i].shutdown_clients();
 379                 return;
 380         }
 381         gettimeofday(&now, NULL);
 382         tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
 383         munmap(map, mmd->size);
 384         map = NULL;
 385         close(audio_file);
 386         mmd->audio_format = -1;
 387         mmd->chunks_sent = 0;
 388         mmd->offset = 0;
 389         mmd->afi.seconds_total = 0;
 390         free(mmd->afi.chunk_table);
 391         mmd->afi.chunk_table = NULL;
 392         tmp  = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_INFO1],
 393                 status_item_list[SI_AUDIO_INFO2], status_item_list[SI_AUDIO_INFO3]);
 394         strcpy(mmd->afi.info_string, tmp);
 395         free(tmp);
 396         tmp  = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_DBINFO1],
 397                 status_item_list[SI_DBINFO2], status_item_list[SI_DBINFO3]);
 398         strcpy(mmd->selector_info, tmp);
 399         free(tmp);
 400         mmd->filename[0] = '\0';
 401         mmd->size = 0;
 402         mmd->events++;
 403 }
 404
 405 /**
 406  * get the header and of the current audio file
 407  *
 408  * \param header_len the length of the header is stored here
 409  *
 410  * \return a pointer to a buffer containing the header, or NULL, if no audio
 411  * file is selected or if the current audio format does not need special header
 412  * treamtment.
 413  *
 414  */
 415 char *vss_get_header(unsigned *header_len)
 416 {
 417         if (mmd->audio_format < 0 || !map || !mmd->afi.header_len)
 418                 return NULL;
 419         *header_len = mmd->afi.header_len;
 420         return map + mmd->afi.header_offset;
 421 }
 422
 423 /**
 424  * get the list of all supported audio formats
 425  *
 426  * \return a space separated list of all supported audio formats
 427  * It is not allocated at runtime, i.e. there is no need to free
 428  * the returned string in the caller.
 429  */
 430 const char *supported_audio_formats(void)
 431 {
 432         return SUPPORTED_AUDIO_FORMATS;
 433 }
 434
 435 /**
 436  * get the chunk time of the current audio file
 437  *
 438  * \return a pointer to a struct containing the chunk time, or NULL,
 439  * if currently no audio file is selected.
 440  */
 441 struct timeval *vss_chunk_time(void)
 442 {
 443         if (mmd->audio_format < 0)
 444                 return NULL;
 445         return &mmd->afi.chunk_tv;
 446 }
 447
 448 /**
 449  * compute the timeout for para_server's main select-loop
 450  *
 451  * This function gets called from para_server to determine the timeout value
 452  * for its main select loop.
 453  *
 454  * Before the timeout is computed, the current vss status flags are evaluated
 455  * and acted upon by calling appropriate functions from the lower layers.
 456  * Possible actions include
 457  *
 458  *      - request a new file list from the current audio file selector
 459  *      - shutdown of all senders (stop/pause command)
 460  *      - reposition the stream (ff/jmp command)
 461  *
 462  * \return A pointer to a struct timeval containing the timeout for the next
 463  * chunk of data to be sent, or NULL if we're not sending right now.
 464  */
 465 struct timeval *vss_preselect(void)
 466 {
 467         struct audio_format_handler *af = NULL;
 468         int i, format;
 469         struct timeval *ret;
 470 again:
 471         format = mmd->audio_format;
 472         if (format >= 0)
 473                 af = afl + format;
 474         else
 475                 for (i = 0; senders[i].name; i++)
 476                         senders[i].shutdown_clients();
 477         if (vss_next() && af) {
 478                 vss_eof();
 479                 return vss_compute_timeout();
 480         }
 481         if (vss_paused() || vss_repos()) {
 482                 for (i = 0; senders[i].name; i++)
 483                         senders[i].shutdown_clients();
 484                 if (af) {
 485                         struct timeval now;
 486                         gettimeofday(&now, NULL);
 487                         if (!vss_paused() || mmd->chunks_sent)
 488                                 tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
 489                         if (vss_repos())
 490                                 tv_add(&now, &announce_tv, &data_send_barrier);
 491                         if (mmd->new_vss_status_flags & VSS_NOMORE)
 492                                 mmd->new_vss_status_flags = VSS_NEXT;
 493                 }
 494                 mmd->chunks_sent = 0;
 495         }
 496         if (vss_repos()) {
 497                 mmd->new_vss_status_flags &= ~(VSS_REPOS);
 498                 mmd->current_chunk = mmd->repos_request;
 499         }
 500         ret = vss_compute_timeout();
 501         if (!ret && !map && vss_playing() &&
 502                         !(mmd->new_vss_status_flags & VSS_NOMORE)) {
 503                 PARA_DEBUG_LOG("%s", "ready and playing, but no audio file\n");
 504                 vss_get_audio_file();
 505                 goto again;
 506         }
 507         return ret;
 508 }
 509
 510 /**
 511  * main sending function
 512  *
 513  * This function gets called from para_server as soon as the next chunk of
 514  * data should be pushed out. It first calls the read_chunk() function of
 515  * the current audio format handler to obtain a pointer to the data to be
 516  * sent out as well as its length. This information is then passed to each
 517  * supported sender's send() function which does the actual sending.
 518  */
 519 void vss_send_chunk(void)
 520 {
 521         int i;
 522         struct audio_format_handler *af;
 523         ssize_t pos;
 524         size_t len;
 525         struct timeval now, due;
 526
 527         if (mmd->audio_format < 0 || !map || !vss_playing())
 528                 return;
 529         af = &afl[mmd->audio_format];
 530         gettimeofday(&now, NULL);
 531         vss_next_chunk_time(&due);
 532         if (tv_diff(&due, &now, NULL) > 0)
 533                 return;
 534         if (chk_barrier("eof", &now, &eof_barrier, &due, 1) < 0)
 535                 return;
 536         if (chk_barrier("data send", &now, &data_send_barrier,
 537                         &due, 1) < 0)
 538                 return;
 539         mmd->new_vss_status_flags &= ~VSS_REPOS;
 540         if (mmd->current_chunk >= mmd->afi.chunks_total) { /* eof */
 541                 mmd->new_vss_status_flags |= VSS_NEXT;
 542                 return vss_eof();
 543         }
 544         pos = mmd->afi.chunk_table[mmd->current_chunk];
 545         len = mmd->afi.chunk_table[mmd->current_chunk + 1] - pos;
 546         /*
 547          * We call the send function also in case of empty chunks as they
 548          * might have still some data queued which can be sent in this case.
 549          */
 550         if (!mmd->chunks_sent) {
 551                 struct timeval tmp;
 552                 gettimeofday(&mmd->stream_start, NULL);
 553                 tv_scale(mmd->current_chunk, &mmd->afi.chunk_tv, &tmp);
 554                 mmd->offset = tv2ms(&tmp);
 555                 mmd->events++;
 556         }
 557         for (i = 0; senders[i].name; i++)
 558                 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
 559                         map + pos, len);
 560         mmd->new_vss_status_flags |= VSS_PLAYING;
 561         mmd->chunks_sent++;
 562         mmd->current_chunk++;
 563 }