server: Fix stop mode.
[paraslash.git] / vss.c
1 /*
2 * Copyright (C) 1997-2008 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 <sys/mman.h> /* mmap */
15 #include <sys/time.h> /* gettimeofday */
16 #include <sys/types.h>
17 #include <dirent.h>
18
19 #include "para.h"
20 #include "error.h"
21 #include "string.h"
22 #include "afh.h"
23 #include "afs.h"
24 #include "server.h"
25 #include "net.h"
26 #include "server.cmdline.h"
27 #include "vss.h"
28 #include "list.h"
29 #include "send.h"
30 #include "ipc.h"
31 #include "fd.h"
32
33 static struct timeval announce_tv;
34 static struct timeval data_send_barrier;
35 static struct timeval eof_barrier;
36 static struct timeval autoplay_barrier;
37
38 extern struct misc_meta_data *mmd;
39
40 extern void dccp_send_init(struct sender *);
41 extern void http_send_init(struct sender *);
42 extern void ortp_send_init(struct sender *);
43
44 /** the list of supported senders */
45 struct sender senders[] = {
46 {
47 .name = "http",
48 .init = http_send_init,
49 },
50 {
51 .name = "dccp",
52 .init = dccp_send_init,
53 },
54 #ifdef HAVE_ORTP
55 {
56 .name = "ortp",
57 .init = ortp_send_init,
58 },
59 #endif
60 {
61 .name = NULL,
62 }
63 };
64
65
66
67 static char *map;
68
69 /**
70 * Check if vss status flag \a P (playing) is set.
71 *
72 * \return Greater than zero if playing, zero otherwise.
73 *
74 */
75 unsigned int vss_playing(void)
76 {
77 return mmd->new_vss_status_flags & VSS_PLAYING;
78 }
79
80 /**
81 * Check if the \a N (next) status flag is set.
82 *
83 * \return Greater than zero if set, zero if not.
84 *
85 */
86 unsigned int vss_next(void)
87 {
88 return mmd->new_vss_status_flags & VSS_NEXT;
89 }
90
91 /**
92 * Check if a reposition request is pending.
93 *
94 * \return Greater than zero if true, zero otherwise.
95 *
96 */
97 unsigned int vss_repos(void)
98 {
99 return mmd->new_vss_status_flags & VSS_REPOS;
100 }
101
102 /**
103 * Check if the vss is currently paused.
104 *
105 * \return Greater than zero if paused, zero otherwise.
106 *
107 */
108 unsigned int vss_paused(void)
109 {
110 return !(mmd->new_vss_status_flags & VSS_NEXT)
111 && !(mmd->new_vss_status_flags & VSS_PLAYING);
112 }
113
114 /**
115 * Check if the vss is currently stopped.
116 *
117 * \return Greater than zero if paused, zero otherwise.
118 *
119 */
120 unsigned int vss_stopped(void)
121 {
122 return (mmd->new_vss_status_flags & VSS_NEXT)
123 && !(mmd->new_vss_status_flags & VSS_PLAYING);
124 }
125
126 /**
127 * Get the data of the given chunk.
128 *
129 * \param chunk_num The number of the desired chunk.
130 * \param buf Chunk data.
131 * \param len Chunk length in bytes.
132 *
133 * \return Standard.
134 */
135 int vss_get_chunk(long unsigned chunk_num, char **buf, size_t *len)
136 {
137 if (!map || !vss_playing())
138 return -E_CHUNK;
139 if (chunk_num >= mmd->afd.afhi.chunks_total)
140 return -E_CHUNK;
141 afh_get_chunk(chunk_num, &mmd->afd.afhi, map, buf, len);
142 return 1;
143 }
144
145 /**
146 * Initialize the virtual streaming system.
147 *
148 * This also initializes all supported senders and starts streaming
149 * if the --autoplay command line flag was given.
150 */
151 void vss_init(void)
152 {
153 int i;
154 char *hn = para_hostname(), *home = para_homedir();
155 long unsigned announce_time = conf.announce_time_arg > 0?
156 conf.announce_time_arg : 300,
157 autoplay_delay = conf.autoplay_delay_arg > 0?
158 conf.autoplay_delay_arg : 0;
159 ms2tv(announce_time, &announce_tv);
160 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&announce_tv));
161 for (i = 0; senders[i].name; i++) {
162 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
163 senders[i].init(&senders[i]);
164 }
165 free(hn);
166 free(home);
167 mmd->sender_cmd_data.cmd_num = -1;
168 if (conf.autoplay_given) {
169 struct timeval now, tmp;
170 mmd->vss_status_flags |= VSS_PLAYING;
171 mmd->new_vss_status_flags |= VSS_PLAYING;
172 gettimeofday(&now, NULL);
173 ms2tv(autoplay_delay, &tmp);
174 tv_add(&now, &tmp, &autoplay_barrier);
175 }
176 }
177
178 static int chk_barrier(const char *bname, const struct timeval *now,
179 const struct timeval *barrier, struct timeval *diff,
180 int print_log)
181 {
182 long ms;
183
184 if (tv_diff(now, barrier, diff) > 0)
185 return 1;
186 ms = tv2ms(diff);
187 if (print_log && ms)
188 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
189 return -1;
190 }
191
192 /*
193 * != NULL: timeout for next chunk
194 * NULL: nothing to do
195 */
196 static struct timeval *vss_compute_timeout(void)
197 {
198 static struct timeval the_timeout;
199 struct timeval now, next_chunk;
200
201 if (vss_next() && map) {
202 /* only sleep a bit, nec*/
203 the_timeout.tv_sec = 0;
204 the_timeout.tv_usec = 100;
205 return &the_timeout;
206 }
207 gettimeofday(&now, NULL);
208 if (chk_barrier("autoplay_delay", &now, &autoplay_barrier,
209 &the_timeout, 1) < 0)
210 return &the_timeout;
211 if (chk_barrier("eof", &now, &eof_barrier, &the_timeout, 1) < 0)
212 return &the_timeout;
213 if (chk_barrier("data send", &now, &data_send_barrier,
214 &the_timeout, 1) < 0)
215 return &the_timeout;
216 if (!vss_playing() || !map)
217 return NULL;
218 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
219 &mmd->stream_start, &next_chunk);
220 if (chk_barrier("chunk", &now, &next_chunk, &the_timeout, 0) < 0)
221 return &the_timeout;
222 /* chunk is due or bof */
223 the_timeout.tv_sec = 0;
224 the_timeout.tv_usec = 0;
225 return &the_timeout;
226 }
227
228 static void vss_eof(void)
229 {
230 struct timeval now;
231 char *tmp;
232
233 if (!map)
234 return;
235 if (mmd->new_vss_status_flags & VSS_NOMORE)
236 mmd->new_vss_status_flags = VSS_NEXT;
237 gettimeofday(&now, NULL);
238 tv_add(&mmd->afd.afhi.eof_tv, &now, &eof_barrier);
239 para_munmap(map, mmd->size);
240 map = NULL;
241 mmd->chunks_sent = 0;
242 mmd->offset = 0;
243 mmd->afd.afhi.seconds_total = 0;
244 free(mmd->afd.afhi.chunk_table);
245 mmd->afd.afhi.chunk_table = NULL;
246 tmp = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_FILE_INFO],
247 status_item_list[SI_TAGINFO1], status_item_list[SI_TAGINFO2]);
248 strncpy(mmd->afd.afhi.info_string, tmp, sizeof(mmd->afd.afhi.info_string));
249 mmd->afd.afhi.info_string[sizeof(mmd->afd.afhi.info_string) - 1] = '\0';
250 make_empty_status_items(mmd->afd.verbose_ls_output);
251 free(tmp);
252 mmd->mtime = 0;
253 mmd->size = 0;
254 mmd->events++;
255 }
256
257 /**
258 * Get the header of the current audio file.
259 *
260 * \param buf The length of the header is stored here.
261 * \param len Points to a buffer containing the header on return.
262 *
263 * \sa afh_get_header.
264 */
265 void vss_get_header(char **buf, size_t *len)
266 {
267 afh_get_header(&mmd->afd.afhi, map, buf, len);
268 }
269
270 /**
271 * Get the list of all supported audio formats.
272 *
273 * \return Aa space separated list of all supported audio formats
274 * It is not allocated at runtime, i.e. there is no need to free
275 * the returned string in the caller.
276 */
277 const char *supported_audio_formats(void)
278 {
279 return SUPPORTED_AUDIO_FORMATS;
280 }
281
282 /**
283 * Get the chunk time of the current audio file.
284 *
285 * \return A pointer to a struct containing the chunk time, or NULL,
286 * if currently no audio file is selected.
287 */
288 struct timeval *vss_chunk_time(void)
289 {
290 if (!map)
291 return NULL;
292 return &mmd->afd.afhi.chunk_tv;
293 }
294
295 /** The possible states of the afs socket. See \ref afs_socket. */
296 enum afs_socket_status {
297 /** Socket is inactive. */
298 AFS_SOCKET_READY,
299 /** Socket fd was included in the write fd set for select(). */
300 AFS_SOCKET_CHECK_FOR_WRITE,
301 /** vss wrote a request to the socket and waits for afs to reply. */
302 AFS_SOCKET_AFD_PENDING
303 };
304
305 static enum afs_socket_status afsss;
306
307 static int need_to_request_new_audio_file(void)
308 {
309 if (map) /* have audio file */
310 return 0;
311 if (!vss_playing()) /* don't need one */
312 return 0;
313 if (mmd->new_vss_status_flags & VSS_NOMORE)
314 return 0;
315 if (afsss == AFS_SOCKET_AFD_PENDING) /* already requested one */
316 return 0;
317 return 1;
318 }
319
320 /**
321 * Compute the timeout for para_server's main select-loop.
322 *
323 * This function gets called from para_server to determine the timeout value
324 * for its main select loop.
325 *
326 * \param rfds The set of file descriptors to be checked for reading.
327 * \param wfds The set of file descriptors to be checked for writing.
328 * \param max_fileno The highest-numbered file descriptor.
329 *
330 * Before the timeout is computed, the current vss status flags are evaluated
331 * and acted upon by calling appropriate functions from the lower layers.
332 * Possible actions include
333 *
334 * - request a new audio file from afs,
335 * - shutdown of all senders (stop/pause command),
336 * - reposition the stream (ff/jmp command).
337 *
338 * \return A pointer to a struct timeval containing the timeout for the next
339 * chunk of data to be sent, or NULL if we're not sending right now.
340 */
341 struct timeval *vss_preselect(fd_set *rfds, fd_set *wfds, int *max_fileno)
342 {
343 int i;
344 struct timeval now;
345
346 if (!map || vss_next() || vss_paused() || vss_repos())
347 for (i = 0; senders[i].name; i++)
348 senders[i].shutdown_clients();
349 if (vss_next())
350 vss_eof();
351 else if (vss_paused()) {
352 if (mmd->chunks_sent) {
353 gettimeofday(&now, NULL);
354 tv_add(&mmd->afd.afhi.eof_tv, &now, &eof_barrier);
355 }
356 mmd->chunks_sent = 0;
357 } else if (vss_repos()) {
358 gettimeofday(&now, NULL);
359 tv_add(&now, &announce_tv, &data_send_barrier);
360 tv_add(&mmd->afd.afhi.eof_tv, &now, &eof_barrier);
361 mmd->chunks_sent = 0;
362 mmd->current_chunk = mmd->repos_request;
363 mmd->new_vss_status_flags &= ~VSS_REPOS;
364 }
365
366 if (need_to_request_new_audio_file()) {
367 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
368 para_fd_set(afs_socket, wfds, max_fileno);
369 afsss = AFS_SOCKET_CHECK_FOR_WRITE;
370 } else
371 para_fd_set(afs_socket, rfds, max_fileno);
372 for (i = 0; senders[i].name; i++) {
373 if (!senders[i].pre_select)
374 continue;
375 senders[i].pre_select(max_fileno, rfds, wfds);
376 }
377 return vss_compute_timeout();
378 }
379
380 static int recv_afs_msg(int *fd, uint32_t *code, uint32_t *data)
381 {
382 char control[255], buf[8];
383 struct msghdr msg = {.msg_iov = NULL};
384 struct cmsghdr *cmsg;
385 struct iovec iov;
386 int ret = 0;
387
388 *fd = -1;
389 iov.iov_base = buf;
390 iov.iov_len = sizeof(buf);
391 msg.msg_iov = &iov;
392 msg.msg_iovlen = 1;
393 msg.msg_control = control;
394 msg.msg_controllen = sizeof(control);
395 memset(buf, 0, sizeof(buf));
396 ret = recvmsg(afs_socket, &msg, 0);
397 if (ret < 0)
398 return -ERRNO_TO_PARA_ERROR(errno);
399 afsss = AFS_SOCKET_READY;
400 if (iov.iov_len != sizeof(buf))
401 return -E_AFS_SHORT_READ;
402 *code = *(uint32_t*)buf;
403 *data = *(uint32_t*)(buf + 4);
404 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
405 if (cmsg->cmsg_level != SOL_SOCKET
406 || cmsg->cmsg_type != SCM_RIGHTS)
407 continue;
408 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
409 continue;
410 *fd = *(int *)CMSG_DATA(cmsg);
411 }
412 return 1;
413 }
414
415 static void recv_afs_result(void)
416 {
417 int ret, passed_fd, shmid;
418 uint32_t afs_code = 0, afs_data = 0;
419 struct stat statbuf;
420 struct timeval now;
421
422 mmd->afd.afhi.chunk_table = NULL;
423 ret = recv_afs_msg(&passed_fd, &afs_code, &afs_data);
424 if (ret < 0)
425 goto err;
426 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
427 afs_data);
428 ret = -E_NOFD;
429 if (afs_code != NEXT_AUDIO_FILE)
430 goto err;
431 if (passed_fd < 0)
432 goto err;
433 shmid = afs_data;
434 ret = load_afd(shmid, &mmd->afd);
435 if (ret < 0)
436 goto err;
437 shm_destroy(shmid);
438 ret = fstat(passed_fd, &statbuf);
439 if (ret < 0) {
440 PARA_ERROR_LOG("fstat error:\n");
441 ret = -ERRNO_TO_PARA_ERROR(errno);
442 goto err;
443 }
444 mmd->size = statbuf.st_size;
445 mmd->mtime = statbuf.st_mtime;
446 map = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE,
447 passed_fd, 0);
448 close(passed_fd);
449 mmd->chunks_sent = 0;
450 mmd->current_chunk = 0;
451 mmd->offset = 0;
452 mmd->events++;
453 mmd->num_played++;
454 mmd->new_vss_status_flags &= (~VSS_NEXT);
455 gettimeofday(&now, NULL);
456 tv_add(&now, &announce_tv, &data_send_barrier);
457 return;
458 err:
459 free(mmd->afd.afhi.chunk_table);
460 if (passed_fd >= 0)
461 close(passed_fd);
462 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
463 mmd->new_vss_status_flags = VSS_NEXT;
464 }
465
466 /**
467 * Main sending function.
468 *
469 * This function gets called from para_server as soon as the next chunk of data
470 * should be pushed out. It obtains a pointer to the data to be sent out as
471 * well as its length from mmd->afd.afhi. This information is then passed to
472 * each supported sender's send() function which is supposed to send out the data
473 * to all connected clients.
474 */
475 static void vss_send_chunk(void)
476 {
477 int i;
478 struct timeval now, due;
479 char *buf;
480 size_t len;
481
482 if (!map || !vss_playing())
483 return;
484 gettimeofday(&now, NULL);
485 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
486 &mmd->stream_start, &due);
487 if (tv_diff(&due, &now, NULL) > 0)
488 return;
489 if (chk_barrier("eof", &now, &eof_barrier, &due, 1) < 0)
490 return;
491 if (chk_barrier("data send", &now, &data_send_barrier,
492 &due, 1) < 0)
493 return;
494 mmd->new_vss_status_flags &= ~VSS_REPOS;
495 if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
496 mmd->new_vss_status_flags |= VSS_NEXT;
497 return;
498 }
499 /*
500 * We call the send function also in case of empty chunks as they
501 * might have still some data queued which can be sent in this case.
502 */
503 if (!mmd->chunks_sent) {
504 struct timeval tmp;
505 gettimeofday(&mmd->stream_start, NULL);
506 tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &tmp);
507 mmd->offset = tv2ms(&tmp);
508 mmd->events++;
509 }
510 afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, map, &buf, &len);
511 for (i = 0; senders[i].name; i++)
512 senders[i].send(mmd->current_chunk, mmd->chunks_sent, buf, len);
513 mmd->new_vss_status_flags |= VSS_PLAYING;
514 mmd->chunks_sent++;
515 mmd->current_chunk++;
516 }
517
518 void vss_post_select(fd_set *rfds, fd_set *wfds)
519 {
520 int ret, i;
521
522 if (mmd->sender_cmd_data.cmd_num >= 0) {
523 int num = mmd->sender_cmd_data.cmd_num,
524 s = mmd->sender_cmd_data.sender_num;
525
526 if (senders[s].client_cmds[num])
527 senders[s].client_cmds[num](&mmd->sender_cmd_data);
528 mmd->sender_cmd_data.cmd_num = -1;
529 }
530 if (afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
531 if (FD_ISSET(afs_socket, rfds))
532 recv_afs_result();
533 } else if (FD_ISSET(afs_socket, wfds)) {
534 PARA_NOTICE_LOG("requesting new fd from afs\n");
535 ret = send_buffer(afs_socket, "new");
536 afsss = AFS_SOCKET_AFD_PENDING;
537 }
538 for (i = 0; senders[i].name; i++) {
539 if (!senders[i].post_select)
540 continue;
541 senders[i].post_select(rfds, wfds);
542 }
543 vss_send_chunk();
544 }