Trivial doxygen fixes.
[paraslash.git] / vss.c
1 /*
2 * Copyright (C) 1997-2009 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 <dirent.h>
15
16 #include "para.h"
17 #include "error.h"
18 #include "portable_io.h"
19 #include "fec.h"
20 #include "string.h"
21 #include "afh.h"
22 #include "afs.h"
23 #include "server.h"
24 #include "net.h"
25 #include "server.cmdline.h"
26 #include "list.h"
27 #include "vss.h"
28 #include "send.h"
29 #include "ipc.h"
30 #include "fd.h"
31 #include "sched.h"
32
33 extern struct misc_meta_data *mmd;
34
35 extern void dccp_send_init(struct sender *);
36 extern void http_send_init(struct sender *);
37 extern void udp_send_init(struct sender *);
38
39 /** The list of supported senders. */
40 struct sender senders[] = {
41 {
42 .name = "http",
43 .init = http_send_init,
44 },
45 {
46 .name = "dccp",
47 .init = dccp_send_init,
48 },
49 {
50 .name = "udp",
51 .init = udp_send_init,
52 },
53 {
54 .name = NULL,
55 }
56 };
57
58 /** The possible states of the afs socket. */
59 enum afs_socket_status {
60 /** Socket is inactive. */
61 AFS_SOCKET_READY,
62 /** Socket fd was included in the write fd set for select(). */
63 AFS_SOCKET_CHECK_FOR_WRITE,
64 /** vss wrote a request to the socket and waits for reply from afs. */
65 AFS_SOCKET_AFD_PENDING
66 };
67
68 /** The task structure for the virtual streaming system. */
69 struct vss_task {
70 /** Copied from the -announce_time command line option. */
71 struct timeval announce_tv;
72 /** End of the announcing interval. */
73 struct timeval data_send_barrier;
74 /** End of the EOF interval. */
75 struct timeval eof_barrier;
76 /** Only used if --autoplay_delay was given. */
77 struct timeval autoplay_barrier;
78 /** Used for afs-server communication. */
79 int afs_socket;
80 /** The current state of \a afs_socket. */
81 enum afs_socket_status afsss;
82 /** The memory mapped audio file. */
83 char *map;
84 /** Used by the scheduler. */
85 struct task task;
86 /** Pointer to the header of the mapped audio file. */
87 const char *header_buf;
88 /** Length of the audio file header. */
89 size_t header_len;
90 };
91
92 static struct list_head fec_client_list;
93
94 struct fec_slice {
95 uint8_t num;
96 uint16_t bytes;
97 };
98
99 struct fec_group {
100 uint32_t num;
101 uint32_t bytes;
102 uint32_t first_chunk;
103 uint32_t num_chunks;
104 struct timeval duration;
105 struct timeval start;
106 struct timeval slice_duration;
107 };
108
109 struct fec_client {
110 struct fec_client_parms *fcp;
111 struct fec_parms *parms;
112 struct list_head node;
113 struct timeval stream_start;
114 int first_stream_chunk;
115 struct fec_group group;
116 struct fec_slice slice;
117 const unsigned char **src_data;
118 unsigned char *extra_src_buf;
119 size_t extra_src_buf_size;
120 unsigned char *enc_buf;
121 size_t enc_buf_size;
122 };
123
124 /**
125 * Get the chunk time of the current audio file.
126 *
127 * \return A pointer to a struct containing the chunk time, or NULL,
128 * if currently no audio file is selected.
129 */
130 struct timeval *vss_chunk_time(void)
131 {
132 if (mmd->afd.afhi.chunk_tv.tv_sec == 0 &&
133 mmd->afd.afhi.chunk_tv.tv_usec == 0)
134 return NULL;
135 return &mmd->afd.afhi.chunk_tv;
136 }
137
138 static void setup_fec_group(struct fec_client *fc, struct vss_task *vsst)
139 {
140 uint32_t num_bytes = 0, chunk_num, max_group_size, last_payload_size;
141 int i, k = fc->fcp->data_slices_per_group;
142 const char *start_buf = NULL;
143 struct timeval tmp, *chunk_tv = vss_chunk_time();
144
145 assert(chunk_tv);
146 max_group_size = (fc->fcp->max_slice_bytes - FEC_HEADER_SIZE) * k;
147 chunk_num = fc->group.first_chunk;
148 for (;;) {
149 const char *buf;
150 size_t len;
151
152 if (chunk_num >= mmd->afd.afhi.chunks_total)
153 break;
154 afh_get_chunk(chunk_num, &mmd->afd.afhi, vsst->map, &buf, &len);
155 if (!start_buf)
156 start_buf = buf;
157 if (num_bytes + len > max_group_size)
158 break;
159 chunk_num++;
160 num_bytes += len;
161 }
162 assert(start_buf);
163 fc->group.num_chunks = chunk_num - fc->group.first_chunk;
164 fc->group.num++;
165 fc->group.bytes = num_bytes;
166 fc->slice.num = 0;
167 fc->slice.bytes = ROUND_UP(num_bytes, k) / k;
168
169 /* The last slice will not be fully used */
170 last_payload_size = num_bytes % fc->slice.bytes;
171 if (!last_payload_size)
172 last_payload_size = fc->slice.bytes;
173
174 tv_scale(fc->group.num_chunks, chunk_tv, &fc->group.duration);
175 tv_scale(fc->group.first_chunk - fc->first_stream_chunk, chunk_tv,
176 &tmp);
177 tv_add(&fc->stream_start, &tmp, &fc->group.start);
178 tv_divide(fc->fcp->slices_per_group, &fc->group.duration,
179 &fc->group.slice_duration);
180
181 for (i = 0; i < k; i++)
182 fc->src_data[i] = (const unsigned char *)start_buf
183 + i * fc->slice.bytes;
184
185 if (start_buf + k * fc->slice.bytes > vsst->map + mmd->size) {
186 /* can not use last slice as it goes beyond the map */
187 if (fc->extra_src_buf_size < fc->slice.bytes)
188 fc->extra_src_buf = para_realloc(fc->extra_src_buf, fc->slice.bytes);
189 memcpy(fc->extra_src_buf, start_buf + (k - 1) * fc->slice.bytes,
190 last_payload_size);
191 memset(fc->extra_src_buf + last_payload_size, 0,
192 fc->slice.bytes - last_payload_size);
193 fc->src_data[k - 1] = fc->extra_src_buf;
194 }
195
196 }
197
198 /**
199 * Write a fec header to a buffer.
200 *
201 * \param buf The buffer to write to.
202 * \param h The fec header to write.
203 */
204 static void write_fec_header(struct fec_client *fc)
205 {
206 char *buf = (char *)fc->enc_buf;
207
208 write_u32(buf, FEC_MAGIC);
209
210 write_u8(buf + 4, fc->fcp->slices_per_group);
211 write_u8(buf + 5, fc->fcp->data_slices_per_group);
212 write_u32(buf + 6, (uint32_t)0); /* audio header len */
213
214 write_u32(buf + 10, fc->group.num);
215 write_u32(buf + 14, fc->group.bytes);
216
217 write_u8(buf + 18, fc->slice.num);
218 write_u16(buf + 20, fc->slice.bytes);
219 memset(buf + 22, 0, 11);
220 }
221
222 /**
223 * Return a buffer that marks the end of the stream.
224 *
225 * \return The length of the eof buffer.
226 *
227 * This is used for (multicast) udp streaming where closing the socket on the
228 * sender might not give rise to an eof condition at the peer.
229 */
230 size_t vss_get_fec_eof_packet(const char **buf)
231 {
232 static const char fec_eof_packet[FEC_HEADER_SIZE] =
233 "\xec\x0d\xcc\xfe\0\0\0\0"
234 "\0\0\0\0\0\0\0\0"
235 "\0\0\0\0\0\0\0\0"
236 "\0\0\0\0\0\0\0\0";
237 *buf = fec_eof_packet;
238 return FEC_HEADER_SIZE;
239 }
240
241 static void compute_next_fec_slice(struct fec_client *fc, struct vss_task *vsst)
242 {
243 if (fc->first_stream_chunk < 0) {
244 fc->stream_start = *now;
245 fc->first_stream_chunk = mmd->current_chunk;
246 fc->group.first_chunk = mmd->current_chunk;
247 fc->group.num = 0;
248 setup_fec_group(fc, vsst);
249 } else if (fc->slice.num == fc->fcp->slices_per_group) {
250 fc->group.first_chunk += fc->group.num_chunks;
251 setup_fec_group(fc, vsst);
252
253 }
254 if (fc->enc_buf_size < fc->slice.bytes + FEC_HEADER_SIZE) {
255 fc->enc_buf_size = fc->slice.bytes + FEC_HEADER_SIZE;
256 fc->enc_buf = para_realloc(fc->enc_buf, fc->enc_buf_size);
257 }
258 write_fec_header(fc);
259 fec_encode(fc->parms, fc->src_data, fc->enc_buf + FEC_HEADER_SIZE,
260 fc->slice.num, fc->slice.bytes);
261 }
262
263 /**
264 * Add one entry to the list of active fec clients.
265 *
266 * \param fcp Describes the fec parameters to be used for this client.
267 * \param result An opaque pointer that must be used by remove the client later.
268 *
269 * \return Standard.
270 */
271 int vss_add_fec_client(struct fec_client_parms *fcp, struct fec_client **result)
272 {
273 int ret;
274 struct fec_client *fc;
275
276 if (fcp->max_slice_bytes < FEC_HEADER_SIZE + fcp->data_slices_per_group)
277 return -ERRNO_TO_PARA_ERROR(EINVAL);
278 fc = para_calloc(sizeof(*fc));
279 fc->fcp = fcp;
280 ret = fec_new(fcp->data_slices_per_group, fcp->slices_per_group,
281 &fc->parms);
282 if (ret < 0)
283 goto err;
284 fc->first_stream_chunk = -1; /* stream not yet started */
285 fc->src_data = para_malloc(fc->fcp->slices_per_group * sizeof(char *));
286 para_list_add(&fc->node, &fec_client_list);
287 *result = fc;
288 return 1;
289 err:
290 fec_free(fc->parms);
291 free(fc);
292 *result = NULL;
293 return ret;
294 }
295
296 /**
297 * Remove one entry from the list of active fec clients.
298 *
299 * \param fc The client to be removed.
300 */
301 void vss_del_fec_client(struct fec_client *fc)
302 {
303 list_del(&fc->node);
304 free(fc->src_data);
305 free(fc->enc_buf);
306 free(fc->extra_src_buf);
307 fec_free(fc->parms);
308 free(fc);
309 }
310
311 /*
312 * Compute if/when next slice is due. If it isn't due yet and \a diff is
313 * not \p Null, compute the time difference next - now, where
314 *
315 * next = stream_start + (first_group_chunk - first_stream_chunk)
316 * * chunk_time + slice_num * slice_time
317 */
318 static int next_slice_is_due(struct fec_client *fc, struct timeval *diff)
319 {
320 struct timeval tmp, next;
321 int ret;
322
323 if (fc->first_stream_chunk < 0)
324 return 1;
325 tv_scale(fc->slice.num, &fc->group.slice_duration, &tmp);
326 tv_add(&tmp, &fc->group.start, &next);
327 ret = tv_diff(&next, now, diff);
328 return ret < 0? 1 : 0;
329 }
330
331 static void compute_slice_timeout(struct timeval *timeout)
332 {
333 struct fec_client *fc;
334
335 assert(vss_playing());
336 list_for_each_entry(fc, &fec_client_list, node) {
337 struct timeval diff;
338
339 if (next_slice_is_due(fc, &diff)) {
340 timeout->tv_sec = 0;
341 timeout->tv_usec = 0;
342 return;
343 }
344 /* timeout = min(timeout, diff) */
345 if (tv_diff(&diff, timeout, NULL) < 0)
346 *timeout = diff;
347 }
348 }
349
350 /**
351 * Check if vss status flag \a P (playing) is set.
352 *
353 * \return Greater than zero if playing, zero otherwise.
354 *
355 */
356 unsigned int vss_playing(void)
357 {
358 return mmd->new_vss_status_flags & VSS_PLAYING;
359 }
360
361 /**
362 * Check if the \a N (next) status flag is set.
363 *
364 * \return Greater than zero if set, zero if not.
365 *
366 */
367 unsigned int vss_next(void)
368 {
369 return mmd->new_vss_status_flags & VSS_NEXT;
370 }
371
372 /**
373 * Check if a reposition request is pending.
374 *
375 * \return Greater than zero if true, zero otherwise.
376 *
377 */
378 unsigned int vss_repos(void)
379 {
380 return mmd->new_vss_status_flags & VSS_REPOS;
381 }
382
383 /**
384 * Check if the vss is currently paused.
385 *
386 * \return Greater than zero if paused, zero otherwise.
387 *
388 */
389 unsigned int vss_paused(void)
390 {
391 return !(mmd->new_vss_status_flags & VSS_NEXT)
392 && !(mmd->new_vss_status_flags & VSS_PLAYING);
393 }
394
395 /**
396 * Check if the vss is currently stopped.
397 *
398 * \return Greater than zero if paused, zero otherwise.
399 *
400 */
401 unsigned int vss_stopped(void)
402 {
403 return (mmd->new_vss_status_flags & VSS_NEXT)
404 && !(mmd->new_vss_status_flags & VSS_PLAYING);
405 }
406
407 static int chk_barrier(const char *bname, const struct timeval *barrier,
408 struct timeval *diff, int print_log)
409 {
410 long ms;
411
412 if (tv_diff(now, barrier, diff) > 0)
413 return 1;
414 ms = tv2ms(diff);
415 if (print_log && ms)
416 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
417 return -1;
418 }
419
420 /*
421 * != NULL: timeout for next chunk
422 * NULL: nothing to do
423 */
424 static struct timeval *vss_compute_timeout(struct vss_task *vsst)
425 {
426 static struct timeval the_timeout;
427 struct timeval next_chunk;
428
429 if (vss_next() && vsst->map) {
430 /* only sleep a bit, nec*/
431 the_timeout.tv_sec = 0;
432 the_timeout.tv_usec = 100;
433 return &the_timeout;
434 }
435 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
436 &the_timeout, 1) < 0)
437 return &the_timeout;
438 if (chk_barrier("eof", &vsst->eof_barrier, &the_timeout, 1) < 0)
439 return &the_timeout;
440 if (chk_barrier("data send", &vsst->data_send_barrier,
441 &the_timeout, 1) < 0)
442 return &the_timeout;
443 if (!vss_playing() || !vsst->map)
444 return NULL;
445 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
446 &mmd->stream_start, &next_chunk);
447 if (chk_barrier("chunk", &next_chunk, &the_timeout, 0) >= 0) {
448 /* chunk is due or bof */
449 the_timeout.tv_sec = 0;
450 the_timeout.tv_usec = 0;
451 return &the_timeout;
452 }
453 /* compute min of current timeout and next slice time */
454 compute_slice_timeout(&the_timeout);
455 return &the_timeout;
456 }
457
458 static void vss_eof(struct vss_task *vsst)
459 {
460
461 mmd->stream_start = *now;
462 if (!vsst->map)
463 return;
464 if (mmd->new_vss_status_flags & VSS_NOMORE)
465 mmd->new_vss_status_flags = VSS_NEXT;
466 tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
467 para_munmap(vsst->map, mmd->size);
468 vsst->map = NULL;
469 mmd->chunks_sent = 0;
470 mmd->offset = 0;
471 mmd->afd.afhi.seconds_total = 0;
472 mmd->afd.afhi.chunk_tv.tv_sec = 0;
473 mmd->afd.afhi.chunk_tv.tv_usec = 0;
474 free(mmd->afd.afhi.chunk_table);
475 mmd->afd.afhi.chunk_table = NULL;
476 free(mmd->afd.afhi.info_string);
477 mmd->afd.afhi.info_string = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_FILE_INFO],
478 status_item_list[SI_TAGINFO1], status_item_list[SI_TAGINFO2]);
479 make_empty_status_items(mmd->afd.verbose_ls_output);
480 mmd->mtime = 0;
481 mmd->size = 0;
482 mmd->events++;
483 }
484
485 /**
486 * Get the list of all supported audio formats.
487 *
488 * \return Aa space separated list of all supported audio formats
489 * It is not allocated at runtime, i.e. there is no need to free
490 * the returned string in the caller.
491 */
492 const char *supported_audio_formats(void)
493 {
494 return SUPPORTED_AUDIO_FORMATS;
495 }
496
497 static int need_to_request_new_audio_file(struct vss_task *vsst)
498 {
499 struct timeval diff;
500
501 if (vsst->map) /* have audio file */
502 return 0;
503 if (!vss_playing()) /* don't need one */
504 return 0;
505 if (mmd->new_vss_status_flags & VSS_NOMORE)
506 return 0;
507 if (vsst->afsss == AFS_SOCKET_AFD_PENDING) /* already requested one */
508 return 0;
509 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
510 &diff, 1) < 0)
511 return 0;
512 return 1;
513 }
514
515
516
517 /**
518 * Compute the timeout for para_server's main select-loop.
519 *
520 * This function gets called from para_server to determine the timeout value
521 * for its main select loop.
522 *
523 * \param s Pointer to the server scheduler.
524 * \param t Pointer to the vss task structure.
525 *
526 * Before the timeout is computed, the current vss status flags are evaluated
527 * and acted upon by calling appropriate functions from the lower layers.
528 * Possible actions include
529 *
530 * - request a new audio file from afs,
531 * - shutdown of all senders (stop/pause command),
532 * - reposition the stream (ff/jmp command).
533 */
534 static void vss_pre_select(struct sched *s, struct task *t)
535 {
536 int i;
537 struct timeval *tv, diff;
538 struct vss_task *vsst = container_of(t, struct vss_task, task);
539
540 if (!vsst->map || vss_next() || vss_paused() || vss_repos()) {
541 struct fec_client *fc, *tmp;
542 for (i = 0; senders[i].name; i++)
543 if (senders[i].shutdown_clients)
544 senders[i].shutdown_clients();
545 list_for_each_entry_safe(fc, tmp, &fec_client_list, node)
546 fc->first_stream_chunk = -1;
547 }
548 if (vss_next())
549 vss_eof(vsst);
550 else if (vss_paused()) {
551 if (mmd->chunks_sent)
552 tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
553 mmd->chunks_sent = 0;
554 } else if (vss_repos()) {
555 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
556 tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
557 mmd->chunks_sent = 0;
558 mmd->current_chunk = mmd->repos_request;
559 mmd->new_vss_status_flags &= ~VSS_REPOS;
560 }
561 if (need_to_request_new_audio_file(vsst)) {
562 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
563 para_fd_set(vsst->afs_socket, &s->wfds, &s->max_fileno);
564 vsst->afsss = AFS_SOCKET_CHECK_FOR_WRITE;
565 } else
566 para_fd_set(vsst->afs_socket, &s->rfds, &s->max_fileno);
567 for (i = 0; senders[i].name; i++) {
568 if (!senders[i].pre_select)
569 continue;
570 senders[i].pre_select(&s->max_fileno, &s->rfds, &s->wfds);
571 }
572 tv = vss_compute_timeout(vsst);
573 if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
574 s->timeout = *tv;
575 }
576
577 static int recv_afs_msg(int afs_socket, int *fd, uint32_t *code, uint32_t *data)
578 {
579 char control[255], buf[8];
580 struct msghdr msg = {.msg_iov = NULL};
581 struct cmsghdr *cmsg;
582 struct iovec iov;
583 int ret = 0;
584
585 *fd = -1;
586 iov.iov_base = buf;
587 iov.iov_len = sizeof(buf);
588 msg.msg_iov = &iov;
589 msg.msg_iovlen = 1;
590 msg.msg_control = control;
591 msg.msg_controllen = sizeof(control);
592 memset(buf, 0, sizeof(buf));
593 ret = recvmsg(afs_socket, &msg, 0);
594 if (ret < 0)
595 return -ERRNO_TO_PARA_ERROR(errno);
596 if (iov.iov_len != sizeof(buf))
597 return -E_AFS_SHORT_READ;
598 *code = *(uint32_t*)buf;
599 *data = *(uint32_t*)(buf + 4);
600 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
601 if (cmsg->cmsg_level != SOL_SOCKET
602 || cmsg->cmsg_type != SCM_RIGHTS)
603 continue;
604 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
605 continue;
606 *fd = *(int *)CMSG_DATA(cmsg);
607 }
608 return 1;
609 }
610
611 static void recv_afs_result(struct vss_task *vsst)
612 {
613 int ret, passed_fd, shmid;
614 uint32_t afs_code = 0, afs_data = 0;
615 struct stat statbuf;
616
617 vsst->afsss = AFS_SOCKET_READY;
618 mmd->afd.afhi.chunk_table = NULL;
619 ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
620 if (ret < 0)
621 goto err;
622 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
623 afs_data);
624 ret = -E_NOFD;
625 if (afs_code != NEXT_AUDIO_FILE)
626 goto err;
627 if (passed_fd < 0)
628 goto err;
629 shmid = afs_data;
630 ret = load_afd(shmid, &mmd->afd);
631 if (ret < 0)
632 goto err;
633 shm_destroy(shmid);
634 ret = fstat(passed_fd, &statbuf);
635 if (ret < 0) {
636 PARA_ERROR_LOG("fstat error:\n");
637 ret = -ERRNO_TO_PARA_ERROR(errno);
638 goto err;
639 }
640 mmd->size = statbuf.st_size;
641 mmd->mtime = statbuf.st_mtime;
642 ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
643 0, &vsst->map);
644 if (ret < 0)
645 goto err;
646 close(passed_fd);
647 mmd->chunks_sent = 0;
648 mmd->current_chunk = 0;
649 mmd->offset = 0;
650 mmd->events++;
651 mmd->num_played++;
652 mmd->new_vss_status_flags &= (~VSS_NEXT);
653 afh_get_header(&mmd->afd.afhi, vsst->map, &vsst->header_buf,
654 &vsst->header_len);
655 return;
656 err:
657 free(mmd->afd.afhi.chunk_table);
658 if (passed_fd >= 0)
659 close(passed_fd);
660 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
661 mmd->new_vss_status_flags = VSS_NEXT;
662 }
663
664 /**
665 * Main sending function.
666 *
667 * This function gets called from vss_post_select(). It checks whether the next
668 * chunk of data should be pushed out. It obtains a pointer to the data to be
669 * sent out as well as its length from mmd->afd.afhi. This information is then
670 * passed to each supported sender's send() function as well as to the send()
671 * functions of each registered fec client.
672 */
673 static void vss_send(struct vss_task *vsst)
674 {
675 int i;
676 struct timeval due;
677 struct fec_client *fc, *tmp_fc;
678
679 if (!vsst->map || !vss_playing())
680 return;
681 if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
682 return;
683 if (chk_barrier("data send", &vsst->data_send_barrier,
684 &due, 1) < 0)
685 return;
686 if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
687 mmd->new_vss_status_flags |= VSS_NEXT;
688 return;
689 }
690 if (!mmd->chunks_sent) {
691 struct timeval tmp;
692 mmd->stream_start = *now;
693 tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &tmp);
694 mmd->offset = tv2ms(&tmp);
695 mmd->events++;
696 }
697 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
698 &mmd->stream_start, &due);
699 if (tv_diff(&due, now, NULL) <= 0) {
700 const char *buf;
701 size_t len;
702 /*
703 * We call the send function also in case of empty chunks as
704 * they might have still some data queued which can be sent in
705 * this case.
706 */
707 afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
708 &buf, &len);
709 for (i = 0; senders[i].name; i++) {
710 if (!senders[i].send)
711 continue;
712 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
713 buf, len, vsst->header_buf, vsst->header_len);
714 }
715 }
716 list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
717 if (!next_slice_is_due(fc, NULL))
718 continue;
719 compute_next_fec_slice(fc, vsst);
720 PARA_DEBUG_LOG("sending %d:%d (%zu bytes)\n", fc->group.num,
721 fc->slice.num, fc->slice.bytes);
722 fc->fcp->send((char *)fc->enc_buf,
723 fc->slice.bytes + FEC_HEADER_SIZE,
724 fc->fcp->private_data);
725 fc->slice.num++;
726 }
727 mmd->new_vss_status_flags |= VSS_PLAYING;
728 mmd->chunks_sent++;
729 mmd->current_chunk++;
730 }
731
732 static void vss_post_select(struct sched *s, struct task *t)
733 {
734 int ret, i;
735 struct vss_task *vsst = container_of(t, struct vss_task, task);
736
737 if (mmd->sender_cmd_data.cmd_num >= 0) {
738 int num = mmd->sender_cmd_data.cmd_num,
739 sender_num = mmd->sender_cmd_data.sender_num;
740
741 if (senders[sender_num].client_cmds[num])
742 senders[sender_num].client_cmds[num](&mmd->sender_cmd_data);
743 mmd->sender_cmd_data.cmd_num = -1;
744 }
745 if (vsst->afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
746 if (FD_ISSET(vsst->afs_socket, &s->rfds))
747 recv_afs_result(vsst);
748 } else if (FD_ISSET(vsst->afs_socket, &s->wfds)) {
749 PARA_NOTICE_LOG("requesting new fd from afs\n");
750 ret = send_buffer(vsst->afs_socket, "new");
751 vsst->afsss = AFS_SOCKET_AFD_PENDING;
752 }
753 for (i = 0; senders[i].name; i++) {
754 if (!senders[i].post_select)
755 continue;
756 senders[i].post_select(&s->rfds, &s->wfds);
757 }
758 if ((vss_playing() && !(mmd->vss_status_flags & VSS_PLAYING)) ||
759 (vss_next() && vss_playing()))
760 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
761 vss_send(vsst);
762 }
763
764 /**
765 * Initialize the virtual streaming system task.
766 *
767 * \param afs_socket The fd for communication with afs.
768 *
769 * This also initializes all supported senders and starts streaming
770 * if the --autoplay command line flag was given.
771 */
772 void init_vss_task(int afs_socket)
773 {
774 static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
775 int i;
776 char *hn = para_hostname(), *home = para_homedir();
777 long unsigned announce_time = conf.announce_time_arg > 0?
778 conf.announce_time_arg : 300,
779 autoplay_delay = conf.autoplay_delay_arg > 0?
780 conf.autoplay_delay_arg : 0;
781
782 vsst->afs_socket = afs_socket;
783 vsst->task.pre_select = vss_pre_select;
784 vsst->task.post_select = vss_post_select;
785 ms2tv(announce_time, &vsst->announce_tv);
786 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst->announce_tv));
787 for (i = 0; senders[i].name; i++) {
788 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
789 senders[i].init(&senders[i]);
790 }
791 free(hn);
792 free(home);
793 mmd->sender_cmd_data.cmd_num = -1;
794 make_empty_status_items(mmd->afd.verbose_ls_output);
795 if (conf.autoplay_given) {
796 struct timeval tmp;
797 mmd->vss_status_flags |= VSS_PLAYING;
798 mmd->new_vss_status_flags |= VSS_PLAYING;
799 ms2tv(autoplay_delay, &tmp);
800 tv_add(now, &tmp, &vsst->autoplay_barrier);
801 tv_add(&vsst->autoplay_barrier, &vsst->announce_tv,
802 &vsst->data_send_barrier);
803 }
804 INIT_LIST_HEAD(&fec_client_list);
805 register_task(&vsst->task);
806 }