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