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