dccp_recv/udp_recv: Use the new nonblock API.
[paraslash.git] / vss.c
1 /*
2 * Copyright (C) 1997-2010 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 <regex.h>
15 #include <dirent.h>
16 #include <osl.h>
17
18 #include "para.h"
19 #include "error.h"
20 #include "portable_io.h"
21 #include "fec.h"
22 #include "string.h"
23 #include "afh.h"
24 #include "afs.h"
25 #include "server.h"
26 #include "net.h"
27 #include "server.cmdline.h"
28 #include "list.h"
29 #include "vss.h"
30 #include "send.h"
31 #include "ipc.h"
32 #include "fd.h"
33 #include "sched.h"
34
35 extern struct misc_meta_data *mmd;
36
37 extern void dccp_send_init(struct sender *);
38 extern void http_send_init(struct sender *);
39 extern void udp_send_init(struct sender *);
40
41 /** The list of supported senders. */
42 struct sender senders[] = {
43 {
44 .name = "http",
45 .init = http_send_init,
46 },
47 {
48 .name = "dccp",
49 .init = dccp_send_init,
50 },
51 {
52 .name = "udp",
53 .init = udp_send_init,
54 },
55 {
56 .name = NULL,
57 }
58 };
59
60 /** The possible states of the afs socket. */
61 enum afs_socket_status {
62 /** Socket is inactive. */
63 AFS_SOCKET_READY,
64 /** Socket fd was included in the write fd set for select(). */
65 AFS_SOCKET_CHECK_FOR_WRITE,
66 /** vss wrote a request to the socket and waits for reply from afs. */
67 AFS_SOCKET_AFD_PENDING
68 };
69
70 /** The task structure for the virtual streaming system. */
71 struct vss_task {
72 /** Copied from the -announce_time command line option. */
73 struct timeval announce_tv;
74 /** End of the announcing interval. */
75 struct timeval data_send_barrier;
76 /** End of the EOF interval. */
77 struct timeval eof_barrier;
78 /** Only used if --autoplay_delay was given. */
79 struct timeval autoplay_barrier;
80 /** Used for afs-server communication. */
81 int afs_socket;
82 /** The current state of \a afs_socket. */
83 enum afs_socket_status afsss;
84 /** The memory mapped audio file. */
85 char *map;
86 /** Used by the scheduler. */
87 struct task task;
88 /** Pointer to the header of the mapped audio file. */
89 const char *header_buf;
90 /** Length of the audio file header. */
91 size_t header_len;
92 /** Time between audio file headers are sent. */
93 struct timeval header_interval;
94 };
95
96 /**
97 * The list of currently connected fec clients.
98 *
99 * Senders may use \ref vss_add_fec_client() to add entries to the list.
100 */
101 static struct list_head fec_client_list;
102
103 /**
104 * Data associated with one FEC group.
105 *
106 * A FEC group consists of a fixed number of slices and this number is given by
107 * the \a slices_per_group parameter of struct \ref fec_client_parms. Each FEC
108 * group contains a number of chunks of the current audio file.
109 *
110 * FEC slices directly correspond to the data packages sent by the paraslash
111 * senders that use FEC. Each slice is identified by its group number and its
112 * number within the group. All slices have the same size, but the last slice
113 * of the group may not be filled entirely.
114 */
115 struct fec_group {
116 /** The number of the FEC group. */
117 uint32_t num;
118 /** Number of bytes in this group. */
119 uint32_t bytes;
120 /** The first chunk of the current audio file belonging to the group. */
121 uint32_t first_chunk;
122 /** The number of chunks contained in this group. */
123 uint32_t num_chunks;
124 /** When the first chunk was sent. */
125 struct timeval start;
126 /** The duration of the full group. */
127 struct timeval duration;
128 /** The group duration divided by the number of slices. */
129 struct timeval slice_duration;
130 /** Group contains the audio file header that occupies that many slices. */
131 uint8_t num_header_slices;
132 };
133
134 /**
135 * Describes one connected FEC client.
136 */
137 struct fec_client {
138 /** If negative, this client is temporarily disabled. */
139 int error;
140 /** Parameters requested by the client. */
141 struct fec_client_parms *fcp;
142 /** Used by the core FEC code. */
143 struct fec_parms *parms;
144 /** The position of this client in the fec client list. */
145 struct list_head node;
146 /** When the first slice for this client was sent. */
147 struct timeval stream_start;
148 /** The first chunk sent to this FEC client. */
149 int first_stream_chunk;
150 /** Describes the current group. */
151 struct fec_group group;
152 /** The current slice. */
153 uint8_t current_slice_num;
154 /** The data to be FEC-encoded (point to a region within the mapped audio file). */
155 const unsigned char **src_data;
156 /** Last time an audio header was sent. */
157 struct timeval next_header_time;
158 /** Used for the last source pointer of an audio file. */
159 unsigned char *extra_src_buf;
160 /** Extra slices needed to store largest chunk + header. */
161 int num_extra_slices;
162 /** Contains the FEC-encoded data. */
163 unsigned char *enc_buf;
164 };
165
166 /**
167 * Get the chunk time of the current audio file.
168 *
169 * \return A pointer to a struct containing the chunk time, or NULL,
170 * if currently no audio file is selected.
171 */
172 struct timeval *vss_chunk_time(void)
173 {
174 if (mmd->afd.afhi.chunk_tv.tv_sec == 0 &&
175 mmd->afd.afhi.chunk_tv.tv_usec == 0)
176 return NULL;
177 return &mmd->afd.afhi.chunk_tv;
178 }
179
180 /**
181 * Write a fec header to a buffer.
182 *
183 * \param buf The buffer to write to.
184 * \param h The fec header to write.
185 */
186 static void write_fec_header(struct fec_client *fc, struct vss_task *vsst)
187 {
188 char *buf = (char *)fc->enc_buf;
189 struct fec_group *g = &fc->group;
190 struct fec_client_parms *p = fc->fcp;
191
192 write_u32(buf, FEC_MAGIC);
193
194 write_u8(buf + 4, p->slices_per_group + fc->num_extra_slices);
195 write_u8(buf + 5, p->data_slices_per_group + fc->num_extra_slices);
196 write_u32(buf + 6, g->num_header_slices? vsst->header_len : 0);
197
198 write_u32(buf + 10, g->num);
199 write_u32(buf + 14, g->bytes);
200
201 write_u8(buf + 18, fc->current_slice_num);
202 write_u16(buf + 20, p->max_slice_bytes - FEC_HEADER_SIZE);
203 write_u8(buf + 22, g->first_chunk? 0 : 1);
204 write_u8(buf + 23, vsst->header_len? 1 : 0);
205 memset(buf + 24, 0, 7);
206 }
207
208 static int need_audio_header(struct fec_client *fc, struct vss_task *vsst)
209 {
210 if (!mmd->current_chunk) {
211 tv_add(now, &vsst->header_interval, &fc->next_header_time);
212 return 0;
213 }
214 if (!vsst->header_buf)
215 return 0;
216 if (!vsst->header_len)
217 return 0;
218 if (fc->group.num && tv_diff(&fc->next_header_time, now, NULL) > 0)
219 return 0;
220 tv_add(now, &vsst->header_interval, &fc->next_header_time);
221 return 1;
222 }
223
224 static int num_slices(long unsigned bytes, struct fec_client *fc, uint8_t *result)
225 {
226 unsigned long m = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
227 unsigned rv, redundant_slices = fc->fcp->slices_per_group
228 - fc->fcp->data_slices_per_group;
229
230 if (!m)
231 return -E_BAD_CT;
232 rv = (bytes + m - 1) / m;
233 if (rv + redundant_slices > 255)
234 return -E_BAD_CT;
235 *result = rv;
236 return 1;
237 }
238
239 /* set group start and group duration */
240 static void set_group_timing(struct fec_client *fc, struct fec_group *g)
241 {
242 struct timeval *chunk_tv = vss_chunk_time();
243
244 tv_scale(g->num_chunks, chunk_tv, &g->duration);
245 tv_divide(fc->fcp->slices_per_group + fc->num_extra_slices,
246 &g->duration, &g->slice_duration);
247 PARA_DEBUG_LOG("durations (group/chunk/slice): %lu/%lu/%lu\n",
248 tv2ms(&g->duration), tv2ms(chunk_tv), tv2ms(&g->slice_duration));
249 }
250
251 static int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
252 {
253 int ret, i, k, data_slices;
254 size_t len;
255 const char *buf, *start_buf;
256 struct fec_group *g = &fc->group;
257 unsigned slice_bytes = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
258 uint32_t max_data_size;
259
260 if (fc->first_stream_chunk < 0) {
261 uint8_t hs, ds; /* needed header/data slices */
262 uint8_t rs = fc->fcp->slices_per_group
263 - fc->fcp->data_slices_per_group; /* redundant slices */
264 int n;
265
266 ret = num_slices(vsst->header_len, fc, &hs);
267 if (ret < 0)
268 return ret;
269 ret = num_slices(afh_get_largest_chunk_size(&mmd->afd.afhi),
270 fc, &ds);
271 if (ret < 0)
272 return ret;
273 k = (int)hs + ds;
274 if (k > 255)
275 return -E_BAD_CT;
276 if (k < fc->fcp->data_slices_per_group)
277 k = fc->fcp->data_slices_per_group;
278 n = k + rs;
279 fc->num_extra_slices = k - fc->fcp->data_slices_per_group;
280 PARA_NOTICE_LOG("fec parms %d:%d:%d (%d extra slices)\n",
281 slice_bytes, k, n, fc->num_extra_slices);
282 fec_free(fc->parms);
283 fc->src_data = para_realloc(fc->src_data, k * sizeof(char *));
284 ret = fec_new(k, n, &fc->parms);
285 if (ret < 0)
286 return ret;
287 fc->stream_start = *now;
288 fc->first_stream_chunk = mmd->current_chunk;
289 g->first_chunk = mmd->current_chunk;
290 g->num = 0;
291 g->start = *now;
292 } else {
293 struct timeval tmp;
294 if (g->first_chunk + g->num_chunks >= mmd->afd.afhi.chunks_total)
295 return 0;
296 /*
297 * Start and duration of this group depend only on the previous
298 * group. Compute the new group start as g->start += g->duration.
299 */
300 tmp = g->start;
301 tv_add(&tmp, &g->duration, &g->start);
302 k = fc->fcp->data_slices_per_group + fc->num_extra_slices;
303 set_group_timing(fc, g);
304 g->first_chunk += g->num_chunks;
305 g->num++;
306 }
307 if (need_audio_header(fc, vsst)) {
308 ret = num_slices(vsst->header_len, fc, &g->num_header_slices);
309 if (ret < 0)
310 return ret;
311 } else
312 g->num_header_slices = 0;
313 afh_get_chunk(g->first_chunk, &mmd->afd.afhi, vsst->map, &start_buf,
314 &len);
315 data_slices = k - g->num_header_slices;
316 assert(data_slices);
317 max_data_size = slice_bytes * data_slices;
318 g->bytes = 0;
319 for (i = g->first_chunk; i < mmd->afd.afhi.chunks_total; i++) {
320 afh_get_chunk(i, &mmd->afd.afhi, vsst->map, &buf, &len);
321 if (g->bytes + len > max_data_size)
322 break;
323 g->bytes += len;
324 }
325 g->num_chunks = i - g->first_chunk;
326 assert(g->num_chunks);
327 fc->current_slice_num = 0;
328 if (g->num == 0)
329 set_group_timing(fc, g);
330
331 /* setup header slices */
332 buf = vsst->header_buf;
333 for (i = 0; i < g->num_header_slices; i++) {
334 fc->src_data[i] = (const unsigned char *)buf;
335 buf += slice_bytes;
336 }
337
338 /* setup data slices */
339 buf = start_buf;
340 for (i = g->num_header_slices; i < k; i++) {
341 if (buf + slice_bytes > vsst->map + mmd->size)
342 /*
343 * Can not use the memory mapped audio file for this
344 * slice as it goes beyond the map. This slice will not
345 * be fully used.
346 */
347 break;
348 fc->src_data[i] = (const unsigned char *)buf;
349 buf += slice_bytes;
350 }
351 if (i < k) {
352 uint32_t payload_size = vsst->map + mmd->size - buf;
353 memcpy(fc->extra_src_buf, buf, payload_size);
354 fc->src_data[i] = fc->extra_src_buf;
355 i++;
356 /* use arbitrary data for all remaining slices */
357 buf = vsst->map;
358 for (; i < k; i++)
359 fc->src_data[i] = (const unsigned char *)buf;
360 }
361 PARA_DEBUG_LOG("FEC group %d: %d chunks (%d - %d), "
362 "%d header slices, %d data slices\n",
363 g->num, g->num_chunks, g->first_chunk,
364 g->first_chunk + g->num_chunks - 1,
365 g->num_header_slices, data_slices
366 );
367 return 1;
368 }
369
370 static int compute_next_fec_slice(struct fec_client *fc, struct vss_task *vsst)
371 {
372 assert(fc->error >= 0);
373 if (fc->first_stream_chunk < 0 || fc->current_slice_num
374 == fc->fcp->slices_per_group + fc->num_extra_slices) {
375 int ret = setup_next_fec_group(fc, vsst);
376 if (ret == 0)
377 return 0;
378 if (ret < 0) {
379 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
380 PARA_ERROR_LOG("FEC client temporarily disabled\n");
381 fc->error = ret;
382 return fc->error;
383 }
384 }
385 write_fec_header(fc, vsst);
386 fec_encode(fc->parms, fc->src_data, fc->enc_buf + FEC_HEADER_SIZE,
387 fc->current_slice_num,
388 fc->fcp->max_slice_bytes - FEC_HEADER_SIZE);
389 return 1;
390 }
391
392 /**
393 * Return a buffer that marks the end of the stream.
394 *
395 * \param buf Result pointer.
396 * \return The length of the eof buffer.
397 *
398 * This is used for (multicast) udp streaming where closing the socket on the
399 * sender might not give rise to an eof condition at the peer.
400 */
401 size_t vss_get_fec_eof_packet(const char **buf)
402 {
403 static const char fec_eof_packet[FEC_HEADER_SIZE] = FEC_EOF_PACKET;
404 *buf = fec_eof_packet;
405 return FEC_HEADER_SIZE;
406 }
407
408 /**
409 * Add one entry to the list of active fec clients.
410 *
411 * \param fcp Describes the fec parameters to be used for this client.
412 * \param result An opaque pointer that must be used by remove the client later.
413 *
414 * \return Standard.
415 */
416 int vss_add_fec_client(struct fec_client_parms *fcp, struct fec_client **result)
417 {
418 int ret;
419 struct fec_client *fc;
420
421 if (fcp->max_slice_bytes < FEC_HEADER_SIZE + fcp->data_slices_per_group)
422 return -ERRNO_TO_PARA_ERROR(EINVAL);
423 fc = para_calloc(sizeof(*fc));
424 fc->fcp = fcp;
425 ret = fec_new(fcp->data_slices_per_group, fcp->slices_per_group,
426 &fc->parms);
427 if (ret < 0)
428 goto err;
429 fc->first_stream_chunk = -1; /* stream not yet started */
430 fc->src_data = para_malloc(fc->fcp->slices_per_group * sizeof(char *));
431 fc->enc_buf = para_calloc(fc->fcp->max_slice_bytes);
432 fc->num_extra_slices = 0;
433 fc->extra_src_buf = para_calloc(fc->fcp->max_slice_bytes);
434 fc->next_header_time.tv_sec = 0;
435 para_list_add(&fc->node, &fec_client_list);
436 *result = fc;
437 return 1;
438 err:
439 fec_free(fc->parms);
440 free(fc);
441 *result = NULL;
442 return ret;
443 }
444
445 /**
446 * Remove one entry from the list of active fec clients.
447 *
448 * \param fc The client to be removed.
449 */
450 void vss_del_fec_client(struct fec_client *fc)
451 {
452 list_del(&fc->node);
453 free(fc->src_data);
454 free(fc->enc_buf);
455 free(fc->extra_src_buf);
456 fec_free(fc->parms);
457 free(fc);
458 }
459
460 /*
461 * Compute if/when next slice is due. If it isn't due yet and \a diff is
462 * not \p Null, compute the time difference next - now, where
463 *
464 * next = stream_start + (first_group_chunk - first_stream_chunk)
465 * * chunk_time + slice_num * slice_time
466 */
467 static int next_slice_is_due(struct fec_client *fc, struct timeval *diff)
468 {
469 struct timeval tmp, next;
470 int ret;
471
472 if (fc->first_stream_chunk < 0)
473 return 1;
474 tv_scale(fc->current_slice_num, &fc->group.slice_duration, &tmp);
475 tv_add(&tmp, &fc->group.start, &next);
476 ret = tv_diff(&next, now, diff);
477 return ret < 0? 1 : 0;
478 }
479
480 static void compute_slice_timeout(struct timeval *timeout)
481 {
482 struct fec_client *fc;
483
484 assert(vss_playing());
485 list_for_each_entry(fc, &fec_client_list, node) {
486 struct timeval diff;
487
488 if (fc->error < 0)
489 continue;
490 if (next_slice_is_due(fc, &diff)) {
491 timeout->tv_sec = 0;
492 timeout->tv_usec = 0;
493 return;
494 }
495 /* timeout = min(timeout, diff) */
496 if (tv_diff(&diff, timeout, NULL) < 0)
497 *timeout = diff;
498 }
499 }
500
501 static void set_eof_barrier(struct vss_task *vsst)
502 {
503 struct fec_client *fc;
504 struct timeval timeout = {1, 0}, *chunk_tv = vss_chunk_time();
505
506 if (!chunk_tv)
507 goto out;
508 list_for_each_entry(fc, &fec_client_list, node) {
509 struct timeval group_duration;
510
511 if (fc->error < 0)
512 continue;
513 tv_scale(fc->group.num_chunks, chunk_tv, &group_duration);
514 if (tv_diff(&timeout, &group_duration, NULL) < 0)
515 timeout = group_duration;
516 }
517 out:
518 tv_add(now, &timeout, &vsst->eof_barrier);
519 }
520
521 /**
522 * Check if vss status flag \a P (playing) is set.
523 *
524 * \return Greater than zero if playing, zero otherwise.
525 *
526 */
527 unsigned int vss_playing(void)
528 {
529 return mmd->new_vss_status_flags & VSS_PLAYING;
530 }
531
532 /**
533 * Check if the \a N (next) status flag is set.
534 *
535 * \return Greater than zero if set, zero if not.
536 *
537 */
538 unsigned int vss_next(void)
539 {
540 return mmd->new_vss_status_flags & VSS_NEXT;
541 }
542
543 /**
544 * Check if a reposition request is pending.
545 *
546 * \return Greater than zero if true, zero otherwise.
547 *
548 */
549 unsigned int vss_repos(void)
550 {
551 return mmd->new_vss_status_flags & VSS_REPOS;
552 }
553
554 /**
555 * Check if the vss is currently paused.
556 *
557 * \return Greater than zero if paused, zero otherwise.
558 *
559 */
560 unsigned int vss_paused(void)
561 {
562 return !(mmd->new_vss_status_flags & VSS_NEXT)
563 && !(mmd->new_vss_status_flags & VSS_PLAYING);
564 }
565
566 /**
567 * Check if the vss is currently stopped.
568 *
569 * \return Greater than zero if paused, zero otherwise.
570 *
571 */
572 unsigned int vss_stopped(void)
573 {
574 return (mmd->new_vss_status_flags & VSS_NEXT)
575 && !(mmd->new_vss_status_flags & VSS_PLAYING);
576 }
577
578 static int chk_barrier(const char *bname, const struct timeval *barrier,
579 struct timeval *diff, int print_log)
580 {
581 long ms;
582
583 if (tv_diff(now, barrier, diff) > 0)
584 return 1;
585 ms = tv2ms(diff);
586 if (print_log && ms)
587 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
588 return -1;
589 }
590
591 /*
592 * != NULL: timeout for next chunk
593 * NULL: nothing to do
594 */
595 static struct timeval *vss_compute_timeout(struct vss_task *vsst)
596 {
597 static struct timeval the_timeout;
598 struct timeval next_chunk;
599
600 if (vss_next() && vsst->map) {
601 /* only sleep a bit, nec*/
602 the_timeout.tv_sec = 0;
603 the_timeout.tv_usec = 100;
604 return &the_timeout;
605 }
606 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
607 &the_timeout, 1) < 0)
608 return &the_timeout;
609 if (chk_barrier("eof", &vsst->eof_barrier, &the_timeout, 1) < 0)
610 return &the_timeout;
611 if (chk_barrier("data send", &vsst->data_send_barrier,
612 &the_timeout, 1) < 0)
613 return &the_timeout;
614 if (!vss_playing() || !vsst->map)
615 return NULL;
616 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
617 &mmd->stream_start, &next_chunk);
618 if (chk_barrier("chunk", &next_chunk, &the_timeout, 0) >= 0) {
619 /* chunk is due or bof */
620 the_timeout.tv_sec = 0;
621 the_timeout.tv_usec = 0;
622 return &the_timeout;
623 }
624 /* compute min of current timeout and next slice time */
625 compute_slice_timeout(&the_timeout);
626 return &the_timeout;
627 }
628
629 static void vss_eof(struct vss_task *vsst)
630 {
631
632 if (!vsst->map)
633 return;
634 if (mmd->new_vss_status_flags & VSS_NOMORE)
635 mmd->new_vss_status_flags = VSS_NEXT;
636 set_eof_barrier(vsst);
637 para_munmap(vsst->map, mmd->size);
638 vsst->map = NULL;
639 mmd->chunks_sent = 0;
640 //mmd->offset = 0;
641 mmd->afd.afhi.seconds_total = 0;
642 mmd->afd.afhi.chunk_tv.tv_sec = 0;
643 mmd->afd.afhi.chunk_tv.tv_usec = 0;
644 free(mmd->afd.afhi.chunk_table);
645 mmd->afd.afhi.chunk_table = NULL;
646 mmd->mtime = 0;
647 mmd->size = 0;
648 mmd->events++;
649 }
650
651 /**
652 * Get the list of all supported audio formats.
653 *
654 * \return Aa space separated list of all supported audio formats
655 * It is not allocated at runtime, i.e. there is no need to free
656 * the returned string in the caller.
657 */
658 const char *supported_audio_formats(void)
659 {
660 return SUPPORTED_AUDIO_FORMATS;
661 }
662
663 static int need_to_request_new_audio_file(struct vss_task *vsst)
664 {
665 struct timeval diff;
666
667 if (vsst->map) /* have audio file */
668 return 0;
669 if (!vss_playing()) /* don't need one */
670 return 0;
671 if (mmd->new_vss_status_flags & VSS_NOMORE)
672 return 0;
673 if (vsst->afsss == AFS_SOCKET_AFD_PENDING) /* already requested one */
674 return 0;
675 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
676 &diff, 1) < 0)
677 return 0;
678 return 1;
679 }
680
681 static void set_mmd_offset(void)
682 {
683 struct timeval offset;
684 tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &offset);
685 mmd->offset = tv2ms(&offset);
686 }
687
688 /**
689 * Compute the timeout for the main select-loop of the scheduler.
690 *
691 * \param s Pointer to the server scheduler.
692 * \param t Pointer to the vss task structure.
693 *
694 * Before the timeout is computed, the current vss status flags are evaluated
695 * and acted upon by calling appropriate functions from the lower layers.
696 * Possible actions include
697 *
698 * - request a new audio file from afs,
699 * - shutdown of all senders (stop/pause command),
700 * - reposition the stream (ff/jmp command).
701 */
702 static void vss_pre_select(struct sched *s, struct task *t)
703 {
704 int i;
705 struct timeval *tv, diff;
706 struct vss_task *vsst = container_of(t, struct vss_task, task);
707
708 if (!vsst->map || vss_next() || vss_paused() || vss_repos()) {
709 struct fec_client *fc, *tmp;
710 for (i = 0; senders[i].name; i++)
711 if (senders[i].shutdown_clients)
712 senders[i].shutdown_clients();
713 list_for_each_entry_safe(fc, tmp, &fec_client_list, node) {
714 fc->first_stream_chunk = -1;
715 fc->error = 0;
716 }
717 mmd->stream_start.tv_sec = 0;
718 mmd->stream_start.tv_usec = 0;
719 }
720 if (vss_next())
721 vss_eof(vsst);
722 else if (vss_paused()) {
723 if (mmd->chunks_sent)
724 set_eof_barrier(vsst);
725 mmd->chunks_sent = 0;
726 } else if (vss_repos()) {
727 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
728 set_eof_barrier(vsst);
729 mmd->chunks_sent = 0;
730 mmd->current_chunk = mmd->repos_request;
731 mmd->new_vss_status_flags &= ~VSS_REPOS;
732 set_mmd_offset();
733 }
734 if (need_to_request_new_audio_file(vsst)) {
735 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
736 para_fd_set(vsst->afs_socket, &s->wfds, &s->max_fileno);
737 vsst->afsss = AFS_SOCKET_CHECK_FOR_WRITE;
738 } else
739 para_fd_set(vsst->afs_socket, &s->rfds, &s->max_fileno);
740 for (i = 0; senders[i].name; i++) {
741 if (!senders[i].pre_select)
742 continue;
743 senders[i].pre_select(&s->max_fileno, &s->rfds, &s->wfds);
744 }
745 tv = vss_compute_timeout(vsst);
746 if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
747 s->timeout = *tv;
748 }
749
750 static int recv_afs_msg(int afs_socket, int *fd, uint32_t *code, uint32_t *data)
751 {
752 char control[255], buf[8];
753 struct msghdr msg = {.msg_iov = NULL};
754 struct cmsghdr *cmsg;
755 struct iovec iov;
756 int ret = 0;
757
758 *fd = -1;
759 iov.iov_base = buf;
760 iov.iov_len = sizeof(buf);
761 msg.msg_iov = &iov;
762 msg.msg_iovlen = 1;
763 msg.msg_control = control;
764 msg.msg_controllen = sizeof(control);
765 memset(buf, 0, sizeof(buf));
766 ret = recvmsg(afs_socket, &msg, 0);
767 if (ret < 0)
768 return -ERRNO_TO_PARA_ERROR(errno);
769 if (iov.iov_len != sizeof(buf))
770 return -E_AFS_SHORT_READ;
771 *code = *(uint32_t*)buf;
772 *data = *(uint32_t*)(buf + 4);
773 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
774 if (cmsg->cmsg_level != SOL_SOCKET
775 || cmsg->cmsg_type != SCM_RIGHTS)
776 continue;
777 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
778 continue;
779 *fd = *(int *)CMSG_DATA(cmsg);
780 }
781 return 1;
782 }
783
784 static void recv_afs_result(struct vss_task *vsst)
785 {
786 int ret, passed_fd, shmid;
787 uint32_t afs_code = 0, afs_data = 0;
788 struct stat statbuf;
789
790 vsst->afsss = AFS_SOCKET_READY;
791 ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
792 if (ret < 0)
793 goto err;
794 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
795 afs_data);
796 ret = -E_NOFD;
797 if (afs_code != NEXT_AUDIO_FILE)
798 goto err;
799 if (passed_fd < 0)
800 goto err;
801 shmid = afs_data;
802 ret = load_afd(shmid, &mmd->afd);
803 if (ret < 0)
804 goto err;
805 shm_destroy(shmid);
806 ret = fstat(passed_fd, &statbuf);
807 if (ret < 0) {
808 PARA_ERROR_LOG("fstat error:\n");
809 ret = -ERRNO_TO_PARA_ERROR(errno);
810 goto err;
811 }
812 mmd->size = statbuf.st_size;
813 mmd->mtime = statbuf.st_mtime;
814 ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
815 0, &vsst->map);
816 if (ret < 0)
817 goto err;
818 close(passed_fd);
819 mmd->chunks_sent = 0;
820 mmd->current_chunk = 0;
821 mmd->offset = 0;
822 mmd->events++;
823 mmd->num_played++;
824 mmd->new_vss_status_flags &= (~VSS_NEXT);
825 afh_get_header(&mmd->afd.afhi, vsst->map, &vsst->header_buf,
826 &vsst->header_len);
827 return;
828 err:
829 free(mmd->afd.afhi.chunk_table);
830 if (passed_fd >= 0)
831 close(passed_fd);
832 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
833 mmd->new_vss_status_flags = VSS_NEXT;
834 }
835
836 /**
837 * Main sending function.
838 *
839 * This function gets called from vss_post_select(). It checks whether the next
840 * chunk of data should be pushed out. It obtains a pointer to the data to be
841 * sent out as well as its length from mmd->afd.afhi. This information is then
842 * passed to each supported sender's send() function as well as to the send()
843 * functions of each registered fec client.
844 */
845 static void vss_send(struct vss_task *vsst)
846 {
847 int i, fec_active = 0;
848 struct timeval due;
849 struct fec_client *fc, *tmp_fc;
850
851 if (!vsst->map || !vss_playing())
852 return;
853 if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
854 return;
855 if (chk_barrier("data send", &vsst->data_send_barrier,
856 &due, 1) < 0)
857 return;
858 list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
859 if (fc->error < 0)
860 continue;
861 if (!next_slice_is_due(fc, NULL)) {
862 fec_active = 1;
863 continue;
864 }
865 if (compute_next_fec_slice(fc, vsst) <= 0)
866 continue;
867 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc->group.num,
868 fc->current_slice_num, fc->fcp->max_slice_bytes);
869 fc->fcp->send((char *)fc->enc_buf,
870 fc->fcp->max_slice_bytes,
871 fc->fcp->private_data);
872 fc->current_slice_num++;
873 fec_active = 1;
874 }
875 if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
876 if (!fec_active)
877 mmd->new_vss_status_flags |= VSS_NEXT;
878 return;
879 }
880 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
881 &mmd->stream_start, &due);
882 if (tv_diff(&due, now, NULL) <= 0) {
883 const char *buf;
884 size_t len;
885
886 if (!mmd->chunks_sent) {
887 mmd->stream_start = *now;
888 mmd->events++;
889 set_mmd_offset();
890 }
891 /*
892 * We call the send function also in case of empty chunks as
893 * they might have still some data queued which can be sent in
894 * this case.
895 */
896 afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
897 &buf, &len);
898 for (i = 0; senders[i].name; i++) {
899 if (!senders[i].send)
900 continue;
901 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
902 buf, len, vsst->header_buf, vsst->header_len);
903 }
904 mmd->chunks_sent++;
905 mmd->current_chunk++;
906 }
907 }
908
909 static void vss_post_select(struct sched *s, struct task *t)
910 {
911 int ret, i;
912 struct vss_task *vsst = container_of(t, struct vss_task, task);
913
914
915 if (mmd->sender_cmd_data.cmd_num >= 0) {
916 int num = mmd->sender_cmd_data.cmd_num,
917 sender_num = mmd->sender_cmd_data.sender_num;
918
919 if (senders[sender_num].client_cmds[num])
920 senders[sender_num].client_cmds[num](&mmd->sender_cmd_data);
921 mmd->sender_cmd_data.cmd_num = -1;
922 }
923 if (vsst->afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
924 if (FD_ISSET(vsst->afs_socket, &s->rfds))
925 recv_afs_result(vsst);
926 } else if (FD_ISSET(vsst->afs_socket, &s->wfds)) {
927 PARA_NOTICE_LOG("requesting new fd from afs\n");
928 ret = send_buffer(vsst->afs_socket, "new");
929 if (ret < 0)
930 PARA_CRIT_LOG("%s\n", para_strerror(-ret));
931 else
932 vsst->afsss = AFS_SOCKET_AFD_PENDING;
933 }
934 for (i = 0; senders[i].name; i++) {
935 if (!senders[i].post_select)
936 continue;
937 senders[i].post_select(&s->rfds, &s->wfds);
938 }
939 if ((vss_playing() && !(mmd->vss_status_flags & VSS_PLAYING)) ||
940 (vss_next() && vss_playing()))
941 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
942 vss_send(vsst);
943 }
944
945 /**
946 * Initialize the virtual streaming system task.
947 *
948 * \param afs_socket The fd for communication with afs.
949 *
950 * This also initializes all supported senders and starts streaming
951 * if the --autoplay command line flag was given.
952 */
953 void init_vss_task(int afs_socket)
954 {
955 static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
956 int i;
957 char *hn = para_hostname(), *home = para_homedir();
958 long unsigned announce_time = conf.announce_time_arg > 0?
959 conf.announce_time_arg : 300,
960 autoplay_delay = conf.autoplay_delay_arg > 0?
961 conf.autoplay_delay_arg : 0;
962 vsst->header_interval.tv_sec = 5; /* should this be configurable? */
963 vsst->afs_socket = afs_socket;
964 vsst->task.pre_select = vss_pre_select;
965 vsst->task.post_select = vss_post_select;
966 ms2tv(announce_time, &vsst->announce_tv);
967 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst->announce_tv));
968 INIT_LIST_HEAD(&fec_client_list);
969 for (i = 0; senders[i].name; i++) {
970 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
971 senders[i].init(&senders[i]);
972 }
973 free(hn);
974 free(home);
975 mmd->sender_cmd_data.cmd_num = -1;
976 if (conf.autoplay_given) {
977 struct timeval tmp;
978 mmd->vss_status_flags |= VSS_PLAYING;
979 mmd->new_vss_status_flags |= VSS_PLAYING;
980 ms2tv(autoplay_delay, &tmp);
981 tv_add(now, &tmp, &vsst->autoplay_barrier);
982 tv_add(&vsst->autoplay_barrier, &vsst->announce_tv,
983 &vsst->data_send_barrier);
984 }
985 register_task(&vsst->task);
986 }