afs.c

   1 /*
   2  * Copyright (C) 1997-2006 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 afs.c audio file sending functions
  20  *
  21  * This contains the audio sending part of para_server which is independent
  22  * of the current audio format, database tool and of the activated senders.
  23  */
  24
  25 #include <sys/time.h> /* gettimeofday */
  26 #include "server.cmdline.h"
  27 #include "db.h"
  28 #include "server.h"
  29 #include "afs.h"
  30 #include "send.h"
  31 #include "error.h"
  32 #include "string.h"
  33
  34 extern const char *status_item_list[];
  35
  36 static struct timeval announce_tv;
  37 static struct timeval data_send_barrier;
  38 static struct timeval eof_barrier;
  39
  40 extern struct misc_meta_data *mmd;
  41 extern struct audio_file_selector dblist[];
  42 extern struct sender senders[];
  43 extern struct gengetopt_args_info conf;
  44
  45 static FILE *audio_file = NULL;
  46
  47 #if 1
  48         void mp3_init(void *);
  49 #endif
  50
  51 #ifdef HAVE_OGGVORBIS
  52         void ogg_init(void *);
  53 #endif
  54
  55 /**
  56  * the list of supported  audio formats
  57  */
  58 struct audio_format afl[] = {
  59 #if 1
  60         {
  61                 .name = "mp3",
  62                 .init = mp3_init,
  63         },
  64 #endif
  65 #ifdef HAVE_OGGVORBIS
  66         {
  67                 .name = "ogg",
  68                 .init = ogg_init,
  69         },
  70 #endif
  71         {
  72                 .name = NULL,
  73         }
  74 };
  75
  76
  77 /**
  78  * check if audio file sender is playing
  79  *
  80  * \return greater than zero if playing, zero otherwise.
  81  *
  82  */
  83 unsigned int afs_playing(void)
  84 {
  85         return mmd->new_afs_status_flags & AFS_PLAYING;
  86 }
  87
  88 /**
  89  * check if 'next' flag is set afs_status_flags
  90  *
  91  * \return greater than zero if set, zero if not.
  92  *
  93  */
  94 unsigned int afs_next(void)
  95 {
  96         return mmd->new_afs_status_flags & AFS_NEXT;
  97 }
  98
  99 /**
 100  * check if a reposition request is pending
 101  *
 102  * \return greater than zero if true, zero otherwise.
 103  *
 104  */
 105 unsigned int afs_repos(void)
 106 {
 107         return mmd->new_afs_status_flags & AFS_REPOS;
 108 }
 109
 110 /**
 111  * check if audio file sender is paused
 112  *
 113  * \return greater than zero if paused, zero otherwise.
 114  *
 115  */
 116 unsigned int afs_paused(void)
 117 {
 118         return !(mmd->new_afs_status_flags & AFS_NEXT)
 119                 && !(mmd->new_afs_status_flags & AFS_PLAYING);
 120 }
 121
 122 /**
 123  * get the name of the given audio format
 124  * \param i the audio format number
 125  *
 126  * This returns a pointer to statically allocated memory so it
 127  * must not be freed by the caller.
 128  */
 129 const char *audio_format_name(int i)
 130 {
 131         return i >= 0?  afl[i].name : "(none)";
 132 }
 133
 134 /**
 135  * initialize the audio file sender
 136  *
 137  * Call the init functions of all supported audio format handlers and
 138  * initialize all supported senders.
 139  */
 140 void afs_init(void)
 141 {
 142         int i;
 143         char *hn = para_hostname(), *home = para_homedir();
 144
 145         PARA_DEBUG_LOG("supported audio formats: %s\n",
 146                 SUPPORTED_AUDIO_FORMATS);
 147         for (i = 0; afl[i].name; i++) {
 148                 PARA_NOTICE_LOG("initializing %s handler\n",
 149                         afl[i].name);
 150                 afl[i].init(&afl[i]);
 151         }
 152         ms2tv(conf.announce_time_arg, &announce_tv);
 153         PARA_INFO_LOG("announce timeval: %lu:%lu\n", announce_tv.tv_sec, announce_tv.tv_usec);
 154         for (i = 0; senders[i].name; i++) {
 155                 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
 156                 senders[i].init(&senders[i]);
 157         }
 158         free(hn);
 159         free(home);
 160 }
 161
 162 static int get_file_info(int i)
 163 {
 164         return  afl[i].get_file_info(audio_file, mmd->audio_file_info,
 165                 &mmd->chunks_total, &mmd->seconds_total);
 166 }
 167
 168 /*
 169  * guess the audio format judging from filename
 170  * \param name the filename
 171  *
 172  * \return This function returns -1 if it has no idea what kind of audio
 173  * file this might be. Otherwise the (non-negative) number of the audio format
 174  * is returned.
 175  */
 176 static int guess_audio_format(const char *name)
 177 {
 178
 179         int i, len1 = strlen(name), len2;
 180
 181         for (i = 0; afl[i].name; i++) {
 182                 len2 = strlen(afl[i].name);
 183                 if (len1 < len2)
 184                         continue;
 185                 if (!strncasecmp(name + (len1 - len2), afl[i].name, len2)) {
 186                         PARA_DEBUG_LOG("might be %s\n", afl[i].name);
 187                         return i;
 188                 }
 189         }
 190         return -1;
 191 }
 192
 193 static int get_audio_format(int omit)
 194 {
 195         int i;
 196
 197         for (i = 0; afl[i].name; i++) {
 198                 if (i == omit || !afl[i].get_file_info)
 199                         continue;
 200                 rewind(audio_file);
 201                 if (get_file_info(i) > 0)
 202                         return i;
 203                 rewind(audio_file);
 204         }
 205         return -E_AUDIO_FORMAT;
 206 }
 207
 208 /*
 209  * upddate shared mem
 210  */
 211 static int update_mmd(void)
 212 {
 213         int i;
 214         struct stat file_status;
 215
 216         i = guess_audio_format(mmd->filename);
 217         if (i < 0 || get_file_info(i) < 0)
 218                 i = get_audio_format(i);
 219         if (i < 0)
 220                 return i;
 221         mmd->audio_format = i;
 222         mmd->chunks_sent = 0;
 223         mmd->current_chunk = 0;
 224         mmd->offset = 0;
 225         if (fstat(fileno(audio_file), &file_status) == -1)
 226                 return -E_FSTAT;
 227         mmd->size = file_status.st_size;
 228         mmd->mtime = file_status.st_mtime;
 229         mmd->events++;
 230         PARA_NOTICE_LOG("next audio file: %s\n", mmd->filename);
 231         return 1;
 232 }
 233
 234 static void get_song(void)
 235 {
 236         char **sl = dblist[mmd->dbt_num].get_audio_file_list(10);
 237         int i;
 238
 239         if (!sl)
 240                 goto err_out;
 241         for (i = 0; sl[i]; i++) {
 242                 struct timeval now;
 243                 PARA_INFO_LOG("trying %s\n", sl[i]);
 244                 if (strlen(sl[i]) >= _POSIX_PATH_MAX)
 245                         continue;
 246                 audio_file = fopen(sl[i], "r");
 247                 if (!audio_file)
 248                         continue;
 249                 strcpy(mmd->filename, sl[i]);
 250                 if (update_mmd() < 0) {
 251                         fclose(audio_file);
 252                         audio_file = NULL;
 253                         continue;
 254                 }
 255                 mmd->num_played++;
 256                 if (dblist[mmd->dbt_num].update_audio_file)
 257                         dblist[mmd->dbt_num].update_audio_file(sl[i]);
 258                 PARA_DEBUG_LOG("%s", "success\n");
 259                 mmd->new_afs_status_flags &= (~AFS_NEXT);
 260                 gettimeofday(&now, NULL);
 261                 tv_add(&now, &announce_tv, &data_send_barrier);
 262
 263                 goto free;
 264         }
 265         PARA_ERROR_LOG("%s", "no valid files found\n");
 266 err_out:
 267         mmd->new_afs_status_flags = AFS_NEXT;
 268 free:
 269         if (sl) {
 270                 for (i = 0; sl[i]; i++)
 271                         free(sl[i]);
 272                 free(sl);
 273         }
 274 }
 275
 276 static int chk_barrier(const char *bname, const struct timeval *now,
 277                 const struct timeval *barrier, struct timeval *diff, int log)
 278 {
 279         long ms;
 280
 281         if (tv_diff(now, barrier, diff) > 0)
 282                 return 1;
 283         ms = tv2ms(diff);
 284         if (log && ms)
 285                 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
 286         return -1;
 287 }
 288
 289 static void afs_next_chunk_time(struct timeval *due)
 290 {
 291         struct timeval tmp;
 292
 293         tv_scale(mmd->chunks_sent, &afl[mmd->audio_format].chunk_tv, &tmp);
 294         tv_add(&tmp, &mmd->stream_start, due);
 295 }
 296
 297 /*
 298  * != NULL: timeout for next chunk
 299  * NULL: nothing to do
 300  */
 301 static struct timeval *afs_compute_timeout(void)
 302 {
 303         static struct timeval the_timeout;
 304         struct timeval now, next_chunk;
 305
 306         if (afs_next() && mmd->audio_format >= 0) {
 307                 /* only sleep a bit, nec*/
 308                 the_timeout.tv_sec = 0;
 309                 the_timeout.tv_usec = 100;
 310                 return &the_timeout;
 311         }
 312         gettimeofday(&now, NULL);
 313         if (chk_barrier("eof", &now, &eof_barrier, &the_timeout, 1) < 0)
 314                 return &the_timeout;
 315         if (chk_barrier("data send", &now, &data_send_barrier,
 316                          &the_timeout, 1) < 0)
 317                 return &the_timeout;
 318         if (mmd->audio_format < 0 || !afs_playing() || !audio_file)
 319                 return NULL;
 320         afs_next_chunk_time(&next_chunk);
 321         if (chk_barrier(afl[mmd->audio_format].name, &now, &next_chunk,
 322                         &the_timeout, 0) < 0)
 323                 return &the_timeout;
 324         /* chunk is due or bof */
 325         the_timeout.tv_sec = 0;
 326         the_timeout.tv_usec = 0;
 327         return &the_timeout;
 328 }
 329
 330 static void afs_eof(struct audio_format *af)
 331 {
 332         struct timeval now;
 333         int i;
 334         char *tmp;
 335
 336         if (!af || !audio_file) {
 337                 for (i = 0; senders[i].name; i++)
 338                         senders[i].shutdown_clients();
 339                 return;
 340         }
 341         gettimeofday(&now, NULL);
 342         tv_add(&af->eof_tv, &now, &eof_barrier);
 343         af->close_audio_file();
 344         audio_file = NULL;
 345         mmd->audio_format = -1;
 346         af = NULL;
 347         mmd->chunks_sent = 0;
 348         mmd->offset = 0;
 349         mmd->seconds_total = 0;
 350         tmp  = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_INFO1],
 351                 status_item_list[SI_AUDIO_INFO2], status_item_list[SI_AUDIO_INFO3]);
 352         strcpy(mmd->audio_file_info, tmp);
 353         free(tmp);
 354         tmp  = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_DBINFO1],
 355                 status_item_list[SI_DBINFO2], status_item_list[SI_DBINFO3]);
 356         strcpy(mmd->dbinfo, tmp);
 357         free(tmp);
 358         mmd->filename[0] = '\0';
 359         mmd->size = 0;
 360         mmd->events++;
 361 }
 362
 363 /**
 364  * compute the timeout for para_server's main select-loop
 365  *
 366  * This function gets called from para_server to determine the timeout value
 367  * for its main select loop.
 368  *
 369  * Before the timeout is computed, the current afs status flags are evaluated
 370  * and acted upon by calling appropriate functions from the lower layers.
 371  * Possible actions include
 372  *
 373  *      - request a new file list from the current dabase tool (audio file change)
 374  *      - shutdown of all senders (stop/pause command)
 375  *      - repositioning of the stream (ff/jmp command)
 376  *
 377  * \return A pointer to a struct timeval containing the timeout for the next
 378  * chunk of data to be sent, or NULL if we're not sending right now.
 379  */
 380 struct timeval *afs_preselect(void)
 381 {
 382         struct audio_format *af = NULL;
 383         int i, format;
 384         struct timeval *ret;
 385 again:
 386         format = mmd->audio_format;
 387         if (format >= 0)
 388                 af = afl + format;
 389         else
 390                 for (i = 0; senders[i].name; i++)
 391                         senders[i].shutdown_clients();
 392         if (afs_next() && af) {
 393                 afs_eof(af);
 394                 return afs_compute_timeout();
 395         }
 396         if (afs_paused() || afs_repos()) {
 397                 for (i = 0; senders[i].name; i++)
 398                         senders[i].shutdown_clients();
 399                 if (af) {
 400                         struct timeval now;
 401                         if (!afs_paused() || mmd->chunks_sent) {
 402                                 gettimeofday(&now, NULL);
 403                                 tv_add(&af->eof_tv, &now, &eof_barrier);
 404                         }
 405                         if (afs_repos())
 406                                 tv_add(&now, &announce_tv, &data_send_barrier);
 407                         if (mmd->new_afs_status_flags & AFS_NOMORE)
 408                                 mmd->new_afs_status_flags = AFS_NEXT;
 409                 }
 410                 mmd->chunks_sent = 0;
 411         }
 412         if (af && afs_repos() && mmd->current_chunk != mmd->repos_request)
 413                 af->reposition_stream(mmd->repos_request);
 414         if (afs_repos()) {
 415                 mmd->new_afs_status_flags &= ~(AFS_REPOS);
 416                 mmd->current_chunk = mmd->repos_request;
 417         }
 418         ret = afs_compute_timeout();
 419         if (!ret && !audio_file && afs_playing() &&
 420                         !(mmd->new_afs_status_flags & AFS_NOMORE)) {
 421                 PARA_DEBUG_LOG("%s", "ready and playing, but no audio file\n");
 422                 get_song();
 423                 goto again;
 424         }
 425         return ret;
 426 }
 427
 428 /**
 429  * afs_send_chunk - paraslash's main sending function
 430  *
 431  * This function gets called from para_server as soon as the next chunk of
 432  * data should be pushed out. It first calls the read_chunk() function of
 433  * the current audio format handler to obtain a pointer to the data to be
 434  * sent out as well as its length. This information is then passed to each
 435  * supported sender's send() function which does the actual sending.
 436  *
 437  * Return value: Positive return value on success, zero on eof and negative
 438  * on errors.
 439  */
 440
 441 void afs_send_chunk(void)
 442 {
 443         int i;
 444         struct audio_format *af;
 445         char *buf;
 446         ssize_t ret;
 447         struct timeval now, due;
 448
 449         if (mmd->audio_format < 0 || !audio_file || !afs_playing())
 450                 return;
 451         af = &afl[mmd->audio_format];
 452         gettimeofday(&now, NULL);
 453         afs_next_chunk_time(&due);
 454         if (tv_diff(&due, &now, NULL) > 0)
 455                 return;
 456         buf = af->read_chunk(mmd->current_chunk, &ret);
 457         mmd->new_afs_status_flags &= ~(AFS_NEXT | AFS_REPOS);
 458         if (!buf) {
 459                 if (ret < 0)
 460                         mmd->new_afs_status_flags = AFS_NEXT;
 461                 else
 462                         mmd->new_afs_status_flags |= AFS_NEXT;
 463                 afs_eof(af);
 464                 return;
 465         }
 466         if (!mmd->chunks_sent) {
 467                 struct timeval tmp;
 468                 gettimeofday(&mmd->stream_start, NULL);
 469                 tv_scale(mmd->current_chunk, &af->chunk_tv, &tmp);
 470                 mmd->offset = tv2ms(&tmp);
 471                 mmd->events++;
 472         }
 473         for (i = 0; senders[i].name; i++)
 474                 senders[i].send(af, mmd->current_chunk,
 475                         mmd->chunks_sent, buf, ret);
 476         mmd->new_afs_status_flags |= AFS_PLAYING;
 477         mmd->chunks_sent++;
 478         mmd->current_chunk++;
 479 }