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 "para.h"
  15 #include "afh.h"
  16 #include "server.h"
  17 #include <sys/mman.h> /* mmap */
  18 #include <sys/time.h> /* gettimeofday */
  19 #include "server.cmdline.h"
  20 #include "afs_common.h"
  21 #include "vss.h"
  22 #include "send.h"
  23 #include "error.h"
  24 #include "string.h"
  25 #include "fd.h"
  26
  27 extern const char *status_item_list[];
  28
  29 static struct timeval announce_tv;
  30 static struct timeval data_send_barrier;
  31 static struct timeval eof_barrier;
  32 static struct timeval autoplay_barrier;
  33
  34 extern struct misc_meta_data *mmd;
  35 extern struct audio_file_selector selectors[];
  36 extern struct sender senders[];
  37
  38 static int audio_file;
  39 static char *map;
  40
  41 #if 1
  42         void mp3_init(struct audio_format_handler *);
  43 #endif
  44
  45 #ifdef HAVE_OGGVORBIS
  46         void ogg_init(struct audio_format_handler *);
  47 #endif
  48 #ifdef HAVE_FAAD
  49         void aac_afh_init(struct audio_format_handler *);
  50 #endif
  51
  52 /**
  53  * the list of supported  audio formats
  54  */
  55 static struct audio_format_handler afl[] = {
  56 #if 1
  57         {
  58                 .name = "mp3",
  59                 .init = mp3_init,
  60         },
  61 #endif
  62 #ifdef HAVE_OGGVORBIS
  63         {
  64                 .name = "ogg",
  65                 .init = ogg_init,
  66         },
  67 #endif
  68 #ifdef HAVE_FAAD
  69         {
  70                 .name = "aac",
  71                 .init = aac_afh_init,
  72         },
  73 #endif
  74         {
  75                 .name = NULL,
  76         }
  77 };
  78
  79 /** iterate over each supported audio format */
  80 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i++)
  81
  82
  83
  84 /**
  85  * check if vss status flag \a P (playing) is set
  86  *
  87  * \return greater than zero if playing, zero otherwise.
  88  *
  89  */
  90 unsigned int vss_playing(void)
  91 {
  92         return mmd->new_vss_status_flags & VSS_PLAYING;
  93 }
  94
  95 /**
  96  * check if \a N (next) status flag is set
  97  *
  98  * \return greater than zero if set, zero if not.
  99  *
 100  */
 101 unsigned int vss_next(void)
 102 {
 103         return mmd->new_vss_status_flags & VSS_NEXT;
 104 }
 105
 106 /**
 107  * check if a reposition request is pending
 108  *
 109  * \return greater than zero if true, zero otherwise.
 110  *
 111  */
 112 unsigned int vss_repos(void)
 113 {
 114         return mmd->new_vss_status_flags & VSS_REPOS;
 115 }
 116
 117 /**
 118  * check if the vss is currently paused
 119  *
 120  * \return greater than zero if paused, zero otherwise.
 121  *
 122  */
 123 unsigned int vss_paused(void)
 124 {
 125         return !(mmd->new_vss_status_flags & VSS_NEXT)
 126                 && !(mmd->new_vss_status_flags & VSS_PLAYING);
 127 }
 128
 129 /**
 130  * get the name of the given audio format
 131  * \param i the audio format number
 132  *
 133  * This returns a pointer to statically allocated memory so it
 134  * must not be freed by the caller.
 135  */
 136 const char *audio_format_name(int i)
 137 {
 138         return i >= 0?  afl[i].name : "(none)";
 139 }
 140
 141 /**
 142  * initialize the virtual streaming system
 143  *
 144  * Call the init functions of all supported audio format handlers and
 145  * initialize all supported senders.
 146  */
 147 void vss_init(void)
 148 {
 149         int i;
 150         char *hn = para_hostname(), *home = para_homedir();
 151         long unsigned announce_time = conf.announce_time_arg > 0?
 152                         conf.announce_time_arg : 300,
 153                 autoplay_delay = conf.autoplay_delay_arg > 0?
 154                         conf.autoplay_delay_arg : 0;
 155
 156         PARA_DEBUG_LOG("supported audio formats: %s\n",
 157                 SUPPORTED_AUDIO_FORMATS);
 158         for (i = 0; afl[i].name; i++) {
 159                 PARA_NOTICE_LOG("initializing %s handler\n",
 160                         afl[i].name);
 161                 afl[i].init(&afl[i]);
 162         }
 163         ms2tv(announce_time, &announce_tv);
 164         PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&announce_tv));
 165         for (i = 0; senders[i].name; i++) {
 166                 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
 167                 senders[i].init(&senders[i]);
 168         }
 169         free(hn);
 170         free(home);
 171         if (conf.autoplay_given) {
 172                 struct timeval now, tmp;
 173                 mmd->vss_status_flags |= VSS_PLAYING;
 174                 mmd->new_vss_status_flags |= VSS_PLAYING;
 175                 gettimeofday(&now, NULL);
 176                 ms2tv(autoplay_delay, &tmp);
 177                 tv_add(&now, &tmp, &autoplay_barrier);
 178         }
 179 }
 180
 181 static int get_file_info(int i)
 182 {
 183         return  afl[i].get_file_info(map, mmd->size, &mmd->afi);
 184 }
 185
 186 /**
 187  * guess the audio format judging from filename
 188  *
 189  * \param name the filename
 190  *
 191  * \return This function returns -1 if it has no idea what kind of audio
 192  * file this might be. Otherwise the (non-negative) number of the audio format
 193  * is returned.
 194  */
 195 int guess_audio_format(const char *name)
 196 {
 197         int i,j, len = strlen(name);
 198
 199         FOR_EACH_AUDIO_FORMAT(i) {
 200                 for (j = 0; afl[i].suffixes[j]; j++) {
 201                         const char *p = afl[i].suffixes[j];
 202                         int plen = strlen(p);
 203                         if (len < plen + 1)
 204                                 continue;
 205                         if (name[len - plen - 1] != '.')
 206                                 continue;
 207                         if (strcasecmp(name + len - plen, p))
 208                                 continue;
 209 //                      PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
 210                         return i;
 211                 }
 212         }
 213         return -1;
 214 }
 215
 216 static int get_audio_format(int omit)
 217 {
 218         int i;
 219
 220         FOR_EACH_AUDIO_FORMAT(i) {
 221                 if (i == omit)
 222                         continue;
 223                 if (get_file_info(i) > 0)
 224                         return i;
 225         }
 226         return -E_AUDIO_FORMAT;
 227 }
 228
 229 /*
 230  * upddate shared mem
 231  */
 232 static int update_mmd(void)
 233 {
 234         int i;
 235
 236         i = guess_audio_format(mmd->filename);
 237         if (i < 0 || get_file_info(i) < 0)
 238                 i = get_audio_format(i);
 239         if (i < 0)
 240                 return i;
 241         mmd->audio_format = i;
 242         mmd->chunks_sent = 0;
 243         mmd->current_chunk = 0;
 244         mmd->offset = 0;
 245         mmd->events++;
 246         return 1;
 247 }
 248
 249 static void vss_get_audio_file(void)
 250 {
 251         char **sl = selectors[mmd->selector_num].get_audio_file_list(10);
 252         int i;
 253         struct stat file_status;
 254
 255         if (!sl)
 256                 goto err_out;
 257         for (i = 0; sl[i]; i++) {
 258                 struct timeval now;
 259                 PARA_INFO_LOG("trying %s\n", sl[i]);
 260                 if (strlen(sl[i]) >= _POSIX_PATH_MAX)
 261                         continue;
 262                 audio_file = open(sl[i], O_RDONLY);
 263                 if (audio_file < 0)
 264                         continue;
 265                 if (fstat(audio_file, &file_status) == -1 ||
 266                                 !file_status.st_size) {
 267                         close(audio_file);
 268                         continue;
 269                 }
 270                 mmd->size = file_status.st_size;
 271                 mmd->mtime = file_status.st_mtime;
 272                 map = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE,
 273                         audio_file, 0);
 274                 strcpy(mmd->filename, sl[i]);
 275                 mmd->afi.header_len = 0; /* default: no header */
 276                 if (update_mmd() < 0) { /* invalid file */
 277                         close(audio_file);
 278                         munmap(map, mmd->size);
 279                         map = NULL;
 280                         continue;
 281                 }
 282                 mmd->num_played++;
 283                 if (selectors[mmd->selector_num].update_audio_file)
 284                         selectors[mmd->selector_num].update_audio_file(sl[i]);
 285                 PARA_NOTICE_LOG("next audio file: %s\n", mmd->filename);
 286                 mmd->new_vss_status_flags &= (~VSS_NEXT);
 287                 gettimeofday(&now, NULL);
 288                 tv_add(&now, &announce_tv, &data_send_barrier);
 289                 goto free;
 290         }
 291 err_out:
 292         PARA_ERROR_LOG("%s", "no valid files found\n");
 293         mmd->new_vss_status_flags = VSS_NEXT;
 294 free:
 295         if (sl) {
 296                 for (i = 0; sl[i]; i++)
 297                         free(sl[i]);
 298                 free(sl);
 299         }
 300 }
 301
 302 static int chk_barrier(const char *bname, const struct timeval *now,
 303                 const struct timeval *barrier, struct timeval *diff,
 304                 int print_log)
 305 {
 306         long ms;
 307
 308         if (tv_diff(now, barrier, diff) > 0)
 309                 return 1;
 310         ms = tv2ms(diff);
 311         if (print_log && ms)
 312                 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
 313         return -1;
 314 }
 315
 316 static void vss_next_chunk_time(struct timeval *due)
 317 {
 318         struct timeval tmp;
 319
 320         tv_scale(mmd->chunks_sent, &mmd->afi.chunk_tv, &tmp);
 321         tv_add(&tmp, &mmd->stream_start, due);
 322 }
 323
 324 /*
 325  * != NULL: timeout for next chunk
 326  * NULL: nothing to do
 327  */
 328 static struct timeval *vss_compute_timeout(void)
 329 {
 330         static struct timeval the_timeout;
 331         struct timeval now, next_chunk;
 332
 333         if (vss_next() && mmd->audio_format >= 0) {
 334                 /* only sleep a bit, nec*/
 335                 the_timeout.tv_sec = 0;
 336                 the_timeout.tv_usec = 100;
 337                 return &the_timeout;
 338         }
 339         gettimeofday(&now, NULL);
 340         if (chk_barrier("autoplay_delay", &now, &autoplay_barrier,
 341                         &the_timeout, 1) < 0)
 342                 return &the_timeout;
 343         if (chk_barrier("eof", &now, &eof_barrier, &the_timeout, 1) < 0)
 344                 return &the_timeout;
 345         if (chk_barrier("data send", &now, &data_send_barrier,
 346                         &the_timeout, 1) < 0)
 347                 return &the_timeout;
 348         if (mmd->audio_format < 0 || !vss_playing() || !map)
 349                 return NULL;
 350         vss_next_chunk_time(&next_chunk);
 351         if (chk_barrier(afl[mmd->audio_format].name, &now, &next_chunk,
 352                         &the_timeout, 0) < 0)
 353                 return &the_timeout;
 354         /* chunk is due or bof */
 355         the_timeout.tv_sec = 0;
 356         the_timeout.tv_usec = 0;
 357         return &the_timeout;
 358 }
 359
 360 static void vss_eof(void)
 361 {
 362         struct timeval now;
 363         int i;
 364         char *tmp;
 365
 366         if (!map) {
 367                 for (i = 0; senders[i].name; i++)
 368                         senders[i].shutdown_clients();
 369                 return;
 370         }
 371         gettimeofday(&now, NULL);
 372         tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
 373         munmap(map, mmd->size);
 374         map = NULL;
 375         close(audio_file);
 376         mmd->audio_format = -1;
 377         mmd->chunks_sent = 0;
 378         mmd->offset = 0;
 379         mmd->afi.seconds_total = 0;
 380         free(mmd->afi.chunk_table);
 381         mmd->afi.chunk_table = NULL;
 382         tmp  = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_INFO1],
 383                 status_item_list[SI_AUDIO_INFO2], status_item_list[SI_AUDIO_INFO3]);
 384         strcpy(mmd->afi.info_string, tmp);
 385         free(tmp);
 386         tmp  = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_DBINFO1],
 387                 status_item_list[SI_DBINFO2], status_item_list[SI_DBINFO3]);
 388         strcpy(mmd->selector_info, tmp);
 389         free(tmp);
 390         mmd->filename[0] = '\0';
 391         mmd->size = 0;
 392         mmd->events++;
 393 }
 394
 395 /**
 396  * get the header and of the current audio file
 397  *
 398  * \param header_len the length of the header is stored here
 399  *
 400  * \return a pointer to a buffer containing the header, or NULL, if no audio
 401  * file is selected or if the current audio format does not need special header
 402  * treamtment.
 403  *
 404  */
 405 char *vss_get_header(size_t *header_len)
 406 {
 407         if (mmd->audio_format < 0 || !map || !mmd->afi.header_len)
 408                 return NULL;
 409         *header_len = mmd->afi.header_len;
 410         return map + mmd->afi.header_offset;
 411 }
 412
 413 /**
 414  * get the list of all supported audio formats
 415  *
 416  * \return a space separated list of all supported audio formats
 417  * It is not allocated at runtime, i.e. there is no need to free
 418  * the returned string in the caller.
 419  */
 420 const char *supported_audio_formats(void)
 421 {
 422         return SUPPORTED_AUDIO_FORMATS;
 423 }
 424
 425 /**
 426  * get the chunk time of the current audio file
 427  *
 428  * \return a pointer to a struct containing the chunk time, or NULL,
 429  * if currently no audio file is selected.
 430  */
 431 struct timeval *vss_chunk_time(void)
 432 {
 433         if (mmd->audio_format < 0)
 434                 return NULL;
 435         return &mmd->afi.chunk_tv;
 436 }
 437
 438 /**
 439  * compute the timeout for para_server's main select-loop
 440  *
 441  * This function gets called from para_server to determine the timeout value
 442  * for its main select loop.
 443  *
 444  * Before the timeout is computed, the current vss status flags are evaluated
 445  * and acted upon by calling appropriate functions from the lower layers.
 446  * Possible actions include
 447  *
 448  *      - request a new file list from the current audio file selector
 449  *      - shutdown of all senders (stop/pause command)
 450  *      - reposition the stream (ff/jmp command)
 451  *
 452  * \return A pointer to a struct timeval containing the timeout for the next
 453  * chunk of data to be sent, or NULL if we're not sending right now.
 454  */
 455 struct timeval *vss_preselect(void)
 456 {
 457         struct audio_format_handler *af = NULL;
 458         int i, format;
 459         struct timeval *ret;
 460 again:
 461         format = mmd->audio_format;
 462         if (format >= 0)
 463                 af = afl + format;
 464         else
 465                 for (i = 0; senders[i].name; i++)
 466                         senders[i].shutdown_clients();
 467         if (vss_next() && af) {
 468                 vss_eof();
 469                 return vss_compute_timeout();
 470         }
 471         if (vss_paused() || vss_repos()) {
 472                 for (i = 0; senders[i].name; i++)
 473                         senders[i].shutdown_clients();
 474                 if (af) {
 475                         struct timeval now;
 476                         gettimeofday(&now, NULL);
 477                         if (!vss_paused() || mmd->chunks_sent)
 478                                 tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
 479                         if (vss_repos())
 480                                 tv_add(&now, &announce_tv, &data_send_barrier);
 481                         if (mmd->new_vss_status_flags & VSS_NOMORE)
 482                                 mmd->new_vss_status_flags = VSS_NEXT;
 483                 }
 484                 mmd->chunks_sent = 0;
 485         }
 486         if (vss_repos()) {
 487                 mmd->new_vss_status_flags &= ~(VSS_REPOS);
 488                 mmd->current_chunk = mmd->repos_request;
 489         }
 490         ret = vss_compute_timeout();
 491         if (!ret && !map && vss_playing() &&
 492                         !(mmd->new_vss_status_flags & VSS_NOMORE)) {
 493                 PARA_DEBUG_LOG("%s", "ready and playing, but no audio file\n");
 494                 vss_get_audio_file();
 495                 goto again;
 496         }
 497         return ret;
 498 }
 499
 500 static void get_chunk(long unsigned chunk_num, char **buf, size_t *len)
 501 {
 502         size_t pos = mmd->afi.chunk_table[chunk_num];
 503         *buf = map + pos;
 504         *len = mmd->afi.chunk_table[chunk_num + 1] - pos;
 505 }
 506
 507 /**
 508  * Get the data of the given chunk.
 509  *
 510  * \param chunk_num The number of the desired chunk.
 511  * \param buf Chunk data.
 512  * \param len Chunk length in bytes.
 513  *
 514  * \return Positive on success, negative on errors.
 515  */
 516 int vss_get_chunk(long unsigned chunk_num, char **buf, size_t *len)
 517 {
 518         if (mmd->audio_format < 0 || !map || !vss_playing())
 519                 return -E_CHUNK;
 520         if (chunk_num >= mmd->afi.chunks_total)
 521                 return -E_CHUNK;
 522         get_chunk(chunk_num, buf, len);
 523         return 1;
 524 }
 525
 526 /**
 527  * main sending function
 528  *
 529  * This function gets called from para_server as soon as the next chunk of
 530  * data should be pushed out. It first calls the read_chunk() function of
 531  * the current audio format handler to obtain a pointer to the data to be
 532  * sent out as well as its length. This information is then passed to each
 533  * supported sender's send() function which does the actual sending.
 534  */
 535 void vss_send_chunk(void)
 536 {
 537         int i;
 538         struct audio_format_handler *af;
 539         struct timeval now, due;
 540
 541         if (mmd->audio_format < 0 || !map || !vss_playing())
 542                 return;
 543         af = &afl[mmd->audio_format];
 544         gettimeofday(&now, NULL);
 545         vss_next_chunk_time(&due);
 546         if (tv_diff(&due, &now, NULL) > 0)
 547                 return;
 548         if (chk_barrier("eof", &now, &eof_barrier, &due, 1) < 0)
 549                 return;
 550         if (chk_barrier("data send", &now, &data_send_barrier,
 551                         &due, 1) < 0)
 552                 return;
 553         mmd->new_vss_status_flags &= ~VSS_REPOS;
 554         if (mmd->current_chunk >= mmd->afi.chunks_total) { /* eof */
 555                 mmd->new_vss_status_flags |= VSS_NEXT;
 556                 return vss_eof();
 557         }
 558         /*
 559          * We call the send function also in case of empty chunks as they
 560          * might have still some data queued which can be sent in this case.
 561          */
 562         if (!mmd->chunks_sent) {
 563                 struct timeval tmp;
 564                 gettimeofday(&mmd->stream_start, NULL);
 565                 tv_scale(mmd->current_chunk, &mmd->afi.chunk_tv, &tmp);
 566                 mmd->offset = tv2ms(&tmp);
 567                 mmd->events++;
 568         }
 569         for (i = 0; senders[i].name; i++) {
 570                 char *buf;
 571                 size_t len;
 572                 get_chunk(mmd->current_chunk, &buf, &len);
 573                 senders[i].send(mmd->current_chunk, mmd->chunks_sent, buf, len);
 574         }
 575         mmd->new_vss_status_flags |= VSS_PLAYING;
 576         mmd->chunks_sent++;
 577         mmd->current_chunk++;
 578 }