kill file parameter from get_file_info of struct audio format handler
[paraslash.git] / 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(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 }