Merge branch 'maint'
[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 <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 /*
294 * Start and duration of this group depend only on the previous
295 * group. Compute the new group start as g->start += g->duration.
296 */
297 struct timeval tmp = g->start;
298 tv_add(&tmp, &g->duration, &g->start);
299 k = fc->fcp->data_slices_per_group + fc->num_extra_slices;
300 set_group_timing(fc, g);
301 g->first_chunk += g->num_chunks;
302 g->num++;
303 }
304 if (g->first_chunk >= mmd->afd.afhi.chunks_total)
305 return 0;
306 if (need_audio_header(fc, vsst)) {
307 ret = num_slices(vsst->header_len, fc, &g->num_header_slices);
308 if (ret < 0)
309 return ret;
310 } else
311 g->num_header_slices = 0;
312 afh_get_chunk(g->first_chunk, &mmd->afd.afhi, vsst->map, &start_buf,
313 &len);
314 data_slices = k - g->num_header_slices;
315 assert(data_slices);
316 max_data_size = slice_bytes * data_slices;
317 g->bytes = 0;
318 for (i = g->first_chunk; i < mmd->afd.afhi.chunks_total; i++) {
319 afh_get_chunk(i, &mmd->afd.afhi, vsst->map, &buf, &len);
320 if (g->bytes + len > max_data_size)
321 break;
322 g->bytes += len;
323 }
324 g->num_chunks = i - g->first_chunk;
325 assert(g->num_chunks);
326 fc->current_slice_num = 0;
327 if (g->num == 0)
328 set_group_timing(fc, g);
329
330 /* setup header slices */
331 buf = vsst->header_buf;
332 for (i = 0; i < g->num_header_slices; i++) {
333 fc->src_data[i] = (const unsigned char *)buf;
334 buf += slice_bytes;
335 }
336
337 /* setup data slices */
338 buf = start_buf;
339 for (i = g->num_header_slices; i < k; i++) {
340 if (buf + slice_bytes > vsst->map + mmd->size)
341 /*
342 * Can not use the memory mapped audio file for this
343 * slice as it goes beyond the map. This slice will not
344 * be fully used.
345 */
346 break;
347 fc->src_data[i] = (const unsigned char *)buf;
348 buf += slice_bytes;
349 }
350 if (i < k) {
351 uint32_t payload_size = vsst->map + mmd->size - buf;
352 memcpy(fc->extra_src_buf, buf, payload_size);
353 fc->src_data[i] = fc->extra_src_buf;
354 i++;
355 /* use arbitrary data for all remaining slices */
356 buf = vsst->map;
357 for (; i < k; i++)
358 fc->src_data[i] = (const unsigned char *)buf;
359 }
360 PARA_DEBUG_LOG("FEC group %d: %d chunks (%d - %d), "
361 "%d header slices, %d data slices\n",
362 g->num, g->num_chunks, g->first_chunk,
363 g->first_chunk + g->num_chunks - 1,
364 g->num_header_slices, data_slices
365 );
366 return 1;
367 }
368
369 static int compute_next_fec_slice(struct fec_client *fc, struct vss_task *vsst)
370 {
371 assert(fc->error >= 0);
372 if (fc->first_stream_chunk < 0 || fc->current_slice_num
373 == fc->fcp->slices_per_group + fc->num_extra_slices) {
374 int ret = setup_next_fec_group(fc, vsst);
375 if (ret == 0)
376 return 0;
377 if (ret < 0) {
378 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
379 PARA_ERROR_LOG("FEC client temporarily disabled\n");
380 fc->error = ret;
381 return fc->error;
382 }
383 }
384 write_fec_header(fc, vsst);
385 fec_encode(fc->parms, fc->src_data, fc->enc_buf + FEC_HEADER_SIZE,
386 fc->current_slice_num,
387 fc->fcp->max_slice_bytes - FEC_HEADER_SIZE);
388 return 1;
389 }
390
391 /**
392 * Return a buffer that marks the end of the stream.
393 *
394 * \param buf Result pointer.
395 * \return The length of the eof buffer.
396 *
397 * This is used for (multicast) udp streaming where closing the socket on the
398 * sender might not give rise to an eof condition at the peer.
399 */
400 size_t vss_get_fec_eof_packet(const char **buf)
401 {
402 static const char fec_eof_packet[FEC_HEADER_SIZE] = FEC_EOF_PACKET;
403 *buf = fec_eof_packet;
404 return FEC_HEADER_SIZE;
405 }
406
407 /**
408 * Add one entry to the list of active fec clients.
409 *
410 * \param fcp Describes the fec parameters to be used for this client.
411 * \param result An opaque pointer that must be used by remove the client later.
412 *
413 * \return Standard.
414 */
415 int vss_add_fec_client(struct fec_client_parms *fcp, struct fec_client **result)
416 {
417 int ret;
418 struct fec_client *fc;
419
420 if (fcp->max_slice_bytes < FEC_HEADER_SIZE + fcp->data_slices_per_group)
421 return -ERRNO_TO_PARA_ERROR(EINVAL);
422 fc = para_calloc(sizeof(*fc));
423 fc->fcp = fcp;
424 ret = fec_new(fcp->data_slices_per_group, fcp->slices_per_group,
425 &fc->parms);
426 if (ret < 0)
427 goto err;
428 fc->first_stream_chunk = -1; /* stream not yet started */
429 fc->src_data = para_malloc(fc->fcp->slices_per_group * sizeof(char *));
430 fc->enc_buf = para_calloc(fc->fcp->max_slice_bytes);
431 fc->num_extra_slices = 0;
432 fc->extra_src_buf = para_calloc(fc->fcp->max_slice_bytes);
433 fc->next_header_time.tv_sec = 0;
434 para_list_add(&fc->node, &fec_client_list);
435 *result = fc;
436 return 1;
437 err:
438 fec_free(fc->parms);
439 free(fc);
440 *result = NULL;
441 return ret;
442 }
443
444 /**
445 * Remove one entry from the list of active fec clients.
446 *
447 * \param fc The client to be removed.
448 */
449 void vss_del_fec_client(struct fec_client *fc)
450 {
451 list_del(&fc->node);
452 free(fc->src_data);
453 free(fc->enc_buf);
454 free(fc->extra_src_buf);
455 fec_free(fc->parms);
456 free(fc);
457 }
458
459 /*
460 * Compute if/when next slice is due. If it isn't due yet and \a diff is
461 * not \p Null, compute the time difference next - now, where
462 *
463 * next = stream_start + (first_group_chunk - first_stream_chunk)
464 * * chunk_time + slice_num * slice_time
465 */
466 static int next_slice_is_due(struct fec_client *fc, struct timeval *diff)
467 {
468 struct timeval tmp, next;
469 int ret;
470
471 if (fc->first_stream_chunk < 0)
472 return 1;
473 tv_scale(fc->current_slice_num, &fc->group.slice_duration, &tmp);
474 tv_add(&tmp, &fc->group.start, &next);
475 ret = tv_diff(&next, now, diff);
476 return ret < 0? 1 : 0;
477 }
478
479 static void compute_slice_timeout(struct timeval *timeout)
480 {
481 struct fec_client *fc;
482
483 assert(vss_playing());
484 list_for_each_entry(fc, &fec_client_list, node) {
485 struct timeval diff;
486
487 if (fc->error < 0)
488 continue;
489 if (next_slice_is_due(fc, &diff)) {
490 timeout->tv_sec = 0;
491 timeout->tv_usec = 0;
492 return;
493 }
494 /* timeout = min(timeout, diff) */
495 if (tv_diff(&diff, timeout, NULL) < 0)
496 *timeout = diff;
497 }
498 }
499
500 static void set_eof_barrier(struct vss_task *vsst)
501 {
502 struct fec_client *fc;
503 struct timeval timeout = {1, 0}, *chunk_tv = vss_chunk_time();
504
505 if (!chunk_tv)
506 goto out;
507 list_for_each_entry(fc, &fec_client_list, node) {
508 struct timeval group_duration;
509
510 if (fc->error < 0)
511 continue;
512 tv_scale(fc->group.num_chunks, chunk_tv, &group_duration);
513 if (tv_diff(&timeout, &group_duration, NULL) < 0)
514 timeout = group_duration;
515 }
516 out:
517 tv_add(now, &timeout, &vsst->eof_barrier);
518 }
519
520 /**
521 * Check if vss status flag \a P (playing) is set.
522 *
523 * \return Greater than zero if playing, zero otherwise.
524 *
525 */
526 unsigned int vss_playing(void)
527 {
528 return mmd->new_vss_status_flags & VSS_PLAYING;
529 }
530
531 /**
532 * Check if the \a N (next) status flag is set.
533 *
534 * \return Greater than zero if set, zero if not.
535 *
536 */
537 unsigned int vss_next(void)
538 {
539 return mmd->new_vss_status_flags & VSS_NEXT;
540 }
541
542 /**
543 * Check if a reposition request is pending.
544 *
545 * \return Greater than zero if true, zero otherwise.
546 *
547 */
548 unsigned int vss_repos(void)
549 {
550 return mmd->new_vss_status_flags & VSS_REPOS;
551 }
552
553 /**
554 * Check if the vss is currently paused.
555 *
556 * \return Greater than zero if paused, zero otherwise.
557 *
558 */
559 unsigned int vss_paused(void)
560 {
561 return !(mmd->new_vss_status_flags & VSS_NEXT)
562 && !(mmd->new_vss_status_flags & VSS_PLAYING);
563 }
564
565 /**
566 * Check if the vss is currently stopped.
567 *
568 * \return Greater than zero if paused, zero otherwise.
569 *
570 */
571 unsigned int vss_stopped(void)
572 {
573 return (mmd->new_vss_status_flags & VSS_NEXT)
574 && !(mmd->new_vss_status_flags & VSS_PLAYING);
575 }
576
577 static int chk_barrier(const char *bname, const struct timeval *barrier,
578 struct timeval *diff, int print_log)
579 {
580 long ms;
581
582 if (tv_diff(now, barrier, diff) > 0)
583 return 1;
584 ms = tv2ms(diff);
585 if (print_log && ms)
586 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
587 return -1;
588 }
589
590 /*
591 * != NULL: timeout for next chunk
592 * NULL: nothing to do
593 */
594 static struct timeval *vss_compute_timeout(struct vss_task *vsst)
595 {
596 static struct timeval the_timeout;
597 struct timeval next_chunk;
598
599 if (vss_next() && vsst->map) {
600 /* only sleep a bit, nec*/
601 the_timeout.tv_sec = 0;
602 the_timeout.tv_usec = 100;
603 return &the_timeout;
604 }
605 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
606 &the_timeout, 1) < 0)
607 return &the_timeout;
608 if (chk_barrier("eof", &vsst->eof_barrier, &the_timeout, 1) < 0)
609 return &the_timeout;
610 if (chk_barrier("data send", &vsst->data_send_barrier,
611 &the_timeout, 1) < 0)
612 return &the_timeout;
613 if (!vss_playing() || !vsst->map)
614 return NULL;
615 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
616 &mmd->stream_start, &next_chunk);
617 if (chk_barrier("chunk", &next_chunk, &the_timeout, 0) >= 0) {
618 /* chunk is due or bof */
619 the_timeout.tv_sec = 0;
620 the_timeout.tv_usec = 0;
621 return &the_timeout;
622 }
623 /* compute min of current timeout and next slice time */
624 compute_slice_timeout(&the_timeout);
625 return &the_timeout;
626 }
627
628 static void vss_eof(struct vss_task *vsst)
629 {
630
631 if (!vsst->map)
632 return;
633 if (mmd->new_vss_status_flags & VSS_NOMORE)
634 mmd->new_vss_status_flags = VSS_NEXT;
635 set_eof_barrier(vsst);
636 para_munmap(vsst->map, mmd->size);
637 vsst->map = NULL;
638 mmd->chunks_sent = 0;
639 //mmd->offset = 0;
640 mmd->afd.afhi.seconds_total = 0;
641 mmd->afd.afhi.chunk_tv.tv_sec = 0;
642 mmd->afd.afhi.chunk_tv.tv_usec = 0;
643 free(mmd->afd.afhi.chunk_table);
644 mmd->afd.afhi.chunk_table = NULL;
645 mmd->mtime = 0;
646 mmd->size = 0;
647 mmd->events++;
648 }
649
650 /**
651 * Get the list of all supported audio formats.
652 *
653 * \return Aa space separated list of all supported audio formats
654 * It is not allocated at runtime, i.e. there is no need to free
655 * the returned string in the caller.
656 */
657 const char *supported_audio_formats(void)
658 {
659 return SUPPORTED_AUDIO_FORMATS;
660 }
661
662 static int need_to_request_new_audio_file(struct vss_task *vsst)
663 {
664 struct timeval diff;
665
666 if (vsst->map) /* have audio file */
667 return 0;
668 if (!vss_playing()) /* don't need one */
669 return 0;
670 if (mmd->new_vss_status_flags & VSS_NOMORE)
671 return 0;
672 if (vsst->afsss == AFS_SOCKET_AFD_PENDING) /* already requested one */
673 return 0;
674 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
675 &diff, 1) < 0)
676 return 0;
677 return 1;
678 }
679
680 static void set_mmd_offset(void)
681 {
682 struct timeval offset;
683 tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &offset);
684 mmd->offset = tv2ms(&offset);
685 }
686
687 /**
688 * Compute the timeout for the main select-loop of the scheduler.
689 *
690 * \param s Pointer to the server scheduler.
691 * \param t Pointer to the vss task structure.
692 *
693 * Before the timeout is computed, the current vss status flags are evaluated
694 * and acted upon by calling appropriate functions from the lower layers.
695 * Possible actions include
696 *
697 * - request a new audio file from afs,
698 * - shutdown of all senders (stop/pause command),
699 * - reposition the stream (ff/jmp command).
700 */
701 static void vss_pre_select(struct sched *s, struct task *t)
702 {
703 int i;
704 struct timeval *tv, diff;
705 struct vss_task *vsst = container_of(t, struct vss_task, task);
706
707 if (!vsst->map || vss_next() || vss_paused() || vss_repos()) {
708 struct fec_client *fc, *tmp;
709 for (i = 0; senders[i].name; i++)
710 if (senders[i].shutdown_clients)
711 senders[i].shutdown_clients();
712 list_for_each_entry_safe(fc, tmp, &fec_client_list, node) {
713 fc->first_stream_chunk = -1;
714 fc->error = 0;
715 }
716 mmd->stream_start.tv_sec = 0;
717 mmd->stream_start.tv_usec = 0;
718 }
719 if (vss_next())
720 vss_eof(vsst);
721 else if (vss_paused()) {
722 if (mmd->chunks_sent)
723 set_eof_barrier(vsst);
724 mmd->chunks_sent = 0;
725 } else if (vss_repos()) {
726 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
727 set_eof_barrier(vsst);
728 mmd->chunks_sent = 0;
729 mmd->current_chunk = mmd->repos_request;
730 mmd->new_vss_status_flags &= ~VSS_REPOS;
731 set_mmd_offset();
732 }
733 if (need_to_request_new_audio_file(vsst)) {
734 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
735 para_fd_set(vsst->afs_socket, &s->wfds, &s->max_fileno);
736 vsst->afsss = AFS_SOCKET_CHECK_FOR_WRITE;
737 } else
738 para_fd_set(vsst->afs_socket, &s->rfds, &s->max_fileno);
739 for (i = 0; senders[i].name; i++) {
740 if (!senders[i].pre_select)
741 continue;
742 senders[i].pre_select(&s->max_fileno, &s->rfds, &s->wfds);
743 }
744 tv = vss_compute_timeout(vsst);
745 if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
746 s->timeout = *tv;
747 }
748
749 static int recv_afs_msg(int afs_socket, int *fd, uint32_t *code, uint32_t *data)
750 {
751 char control[255], buf[8];
752 struct msghdr msg = {.msg_iov = NULL};
753 struct cmsghdr *cmsg;
754 struct iovec iov;
755 int ret = 0;
756
757 *fd = -1;
758 iov.iov_base = buf;
759 iov.iov_len = sizeof(buf);
760 msg.msg_iov = &iov;
761 msg.msg_iovlen = 1;
762 msg.msg_control = control;
763 msg.msg_controllen = sizeof(control);
764 memset(buf, 0, sizeof(buf));
765 ret = recvmsg(afs_socket, &msg, 0);
766 if (ret < 0)
767 return -ERRNO_TO_PARA_ERROR(errno);
768 if (iov.iov_len != sizeof(buf))
769 return -E_AFS_SHORT_READ;
770 *code = *(uint32_t*)buf;
771 *data = *(uint32_t*)(buf + 4);
772 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
773 if (cmsg->cmsg_level != SOL_SOCKET
774 || cmsg->cmsg_type != SCM_RIGHTS)
775 continue;
776 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
777 continue;
778 *fd = *(int *)CMSG_DATA(cmsg);
779 }
780 return 1;
781 }
782
783 static void recv_afs_result(struct vss_task *vsst)
784 {
785 int ret, passed_fd, shmid;
786 uint32_t afs_code = 0, afs_data = 0;
787 struct stat statbuf;
788
789 vsst->afsss = AFS_SOCKET_READY;
790 ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
791 if (ret < 0)
792 goto err;
793 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
794 afs_data);
795 ret = -E_NOFD;
796 if (afs_code != NEXT_AUDIO_FILE)
797 goto err;
798 if (passed_fd < 0)
799 goto err;
800 shmid = afs_data;
801 ret = load_afd(shmid, &mmd->afd);
802 if (ret < 0)
803 goto err;
804 shm_destroy(shmid);
805 ret = fstat(passed_fd, &statbuf);
806 if (ret < 0) {
807 PARA_ERROR_LOG("fstat error:\n");
808 ret = -ERRNO_TO_PARA_ERROR(errno);
809 goto err;
810 }
811 mmd->size = statbuf.st_size;
812 mmd->mtime = statbuf.st_mtime;
813 ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
814 0, &vsst->map);
815 if (ret < 0)
816 goto err;
817 close(passed_fd);
818 mmd->chunks_sent = 0;
819 mmd->current_chunk = 0;
820 mmd->offset = 0;
821 mmd->events++;
822 mmd->num_played++;
823 mmd->new_vss_status_flags &= (~VSS_NEXT);
824 afh_get_header(&mmd->afd.afhi, vsst->map, &vsst->header_buf,
825 &vsst->header_len);
826 return;
827 err:
828 free(mmd->afd.afhi.chunk_table);
829 if (passed_fd >= 0)
830 close(passed_fd);
831 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
832 mmd->new_vss_status_flags = VSS_NEXT;
833 }
834
835 /**
836 * Main sending function.
837 *
838 * This function gets called from vss_post_select(). It checks whether the next
839 * chunk of data should be pushed out. It obtains a pointer to the data to be
840 * sent out as well as its length from mmd->afd.afhi. This information is then
841 * passed to each supported sender's send() function as well as to the send()
842 * functions of each registered fec client.
843 */
844 static void vss_send(struct vss_task *vsst)
845 {
846 int i, fec_active = 0;
847 struct timeval due;
848 struct fec_client *fc, *tmp_fc;
849
850 if (!vsst->map || !vss_playing())
851 return;
852 if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
853 return;
854 if (chk_barrier("data send", &vsst->data_send_barrier,
855 &due, 1) < 0)
856 return;
857 list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
858 if (fc->error < 0)
859 continue;
860 if (!next_slice_is_due(fc, NULL)) {
861 fec_active = 1;
862 continue;
863 }
864 if (compute_next_fec_slice(fc, vsst) <= 0)
865 continue;
866 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc->group.num,
867 fc->current_slice_num, fc->fcp->max_slice_bytes);
868 fc->fcp->send((char *)fc->enc_buf,
869 fc->fcp->max_slice_bytes,
870 fc->fcp->private_data);
871 fc->current_slice_num++;
872 fec_active = 1;
873 }
874 if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
875 if (!fec_active)
876 mmd->new_vss_status_flags |= VSS_NEXT;
877 return;
878 }
879 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
880 &mmd->stream_start, &due);
881 if (tv_diff(&due, now, NULL) <= 0) {
882 const char *buf;
883 size_t len;
884
885 if (!mmd->chunks_sent) {
886 mmd->stream_start = *now;
887 mmd->events++;
888 set_mmd_offset();
889 }
890 /*
891 * We call the send function also in case of empty chunks as
892 * they might have still some data queued which can be sent in
893 * this case.
894 */
895 afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
896 &buf, &len);
897 for (i = 0; senders[i].name; i++) {
898 if (!senders[i].send)
899 continue;
900 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
901 buf, len, vsst->header_buf, vsst->header_len);
902 }
903 mmd->chunks_sent++;
904 mmd->current_chunk++;
905 }
906 }
907
908 static void vss_post_select(struct sched *s, struct task *t)
909 {
910 int ret, i;
911 struct vss_task *vsst = container_of(t, struct vss_task, task);
912
913
914 if (mmd->sender_cmd_data.cmd_num >= 0) {
915 int num = mmd->sender_cmd_data.cmd_num,
916 sender_num = mmd->sender_cmd_data.sender_num;
917
918 if (senders[sender_num].client_cmds[num])
919 senders[sender_num].client_cmds[num](&mmd->sender_cmd_data);
920 mmd->sender_cmd_data.cmd_num = -1;
921 }
922 if (vsst->afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
923 if (FD_ISSET(vsst->afs_socket, &s->rfds))
924 recv_afs_result(vsst);
925 } else if (FD_ISSET(vsst->afs_socket, &s->wfds)) {
926 PARA_NOTICE_LOG("requesting new fd from afs\n");
927 ret = send_buffer(vsst->afs_socket, "new");
928 if (ret < 0)
929 PARA_CRIT_LOG("%s\n", para_strerror(-ret));
930 else
931 vsst->afsss = AFS_SOCKET_AFD_PENDING;
932 }
933 for (i = 0; senders[i].name; i++) {
934 if (!senders[i].post_select)
935 continue;
936 senders[i].post_select(&s->rfds, &s->wfds);
937 }
938 if ((vss_playing() && !(mmd->vss_status_flags & VSS_PLAYING)) ||
939 (vss_next() && vss_playing()))
940 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
941 vss_send(vsst);
942 }
943
944 /**
945 * Initialize the virtual streaming system task.
946 *
947 * \param afs_socket The fd for communication with afs.
948 *
949 * This also initializes all supported senders and starts streaming
950 * if the --autoplay command line flag was given.
951 */
952 void init_vss_task(int afs_socket)
953 {
954 static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
955 int i;
956 char *hn = para_hostname(), *home = para_homedir();
957 long unsigned announce_time = conf.announce_time_arg > 0?
958 conf.announce_time_arg : 300,
959 autoplay_delay = conf.autoplay_delay_arg > 0?
960 conf.autoplay_delay_arg : 0;
961 vsst->header_interval.tv_sec = 5; /* should this be configurable? */
962 vsst->afs_socket = afs_socket;
963 vsst->task.pre_select = vss_pre_select;
964 vsst->task.post_select = vss_post_select;
965 ms2tv(announce_time, &vsst->announce_tv);
966 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst->announce_tv));
967 INIT_LIST_HEAD(&fec_client_list);
968 for (i = 0; senders[i].name; i++) {
969 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
970 senders[i].init(&senders[i]);
971 }
972 free(hn);
973 free(home);
974 mmd->sender_cmd_data.cmd_num = -1;
975 if (conf.autoplay_given) {
976 struct timeval tmp;
977 mmd->vss_status_flags |= VSS_PLAYING;
978 mmd->new_vss_status_flags |= VSS_PLAYING;
979 ms2tv(autoplay_delay, &tmp);
980 tv_add(now, &tmp, &vsst->autoplay_barrier);
981 tv_add(&vsst->autoplay_barrier, &vsst->announce_tv,
982 &vsst->data_send_barrier);
983 }
984 register_task(&vsst->task);
985 }