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[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 group duration divided by the number of slices. */
127 struct timeval slice_duration;
128 /** Group contains the audio file header that occupies that many slices. */
129 uint8_t num_header_slices;
130 };
131
132 /**
133 * Describes one connected FEC client.
134 */
135 struct fec_client {
136 /** If negative, this client is temporarily disabled. */
137 int error;
138 /** Parameters requested by the client. */
139 struct fec_client_parms *fcp;
140 /** Used by the core FEC code. */
141 struct fec_parms *parms;
142 /** The position of this client in the fec client list. */
143 struct list_head node;
144 /** When the first slice for this client was sent. */
145 struct timeval stream_start;
146 /** The first chunk sent to this FEC client. */
147 int first_stream_chunk;
148 /** Describes the current group. */
149 struct fec_group group;
150 /** The current slice. */
151 uint8_t current_slice_num;
152 /** The data to be FEC-encoded (point to a region within the mapped audio file). */
153 const unsigned char **src_data;
154 /** Last time an audio header was sent. */
155 struct timeval next_header_time;
156 /** Used for the last source pointer of an audio file. */
157 unsigned char *extra_src_buf;
158 /** Extra slices needed to store largest chunk + header. */
159 int num_extra_slices;
160 /** Contains the FEC-encoded data. */
161 unsigned char *enc_buf;
162 };
163
164 /**
165 * Get the chunk time of the current audio file.
166 *
167 * \return A pointer to a struct containing the chunk time, or NULL,
168 * if currently no audio file is selected.
169 */
170 struct timeval *vss_chunk_time(void)
171 {
172 if (mmd->afd.afhi.chunk_tv.tv_sec == 0 &&
173 mmd->afd.afhi.chunk_tv.tv_usec == 0)
174 return NULL;
175 return &mmd->afd.afhi.chunk_tv;
176 }
177
178 /**
179 * Write a fec header to a buffer.
180 *
181 * \param buf The buffer to write to.
182 * \param h The fec header to write.
183 */
184 static void write_fec_header(struct fec_client *fc, struct vss_task *vsst)
185 {
186 char *buf = (char *)fc->enc_buf;
187 struct fec_group *g = &fc->group;
188 struct fec_client_parms *p = fc->fcp;
189
190 write_u32(buf, FEC_MAGIC);
191
192 write_u8(buf + 4, p->slices_per_group + fc->num_extra_slices);
193 write_u8(buf + 5, p->data_slices_per_group + fc->num_extra_slices);
194 write_u32(buf + 6, g->num_header_slices? vsst->header_len : 0);
195
196 write_u32(buf + 10, g->num);
197 write_u32(buf + 14, g->bytes);
198
199 write_u8(buf + 18, fc->current_slice_num);
200 write_u16(buf + 20, p->max_slice_bytes - FEC_HEADER_SIZE);
201 write_u8(buf + 22, g->first_chunk? 0 : 1);
202 write_u8(buf + 23, vsst->header_len? 1 : 0);
203 memset(buf + 24, 0, 7);
204 }
205
206 static int need_audio_header(struct fec_client *fc, struct vss_task *vsst)
207 {
208 if (!mmd->current_chunk) {
209 tv_add(now, &vsst->header_interval, &fc->next_header_time);
210 return 0;
211 }
212 if (!vsst->header_buf)
213 return 0;
214 if (!vsst->header_len)
215 return 0;
216 if (fc->group.num && tv_diff(&fc->next_header_time, now, NULL) > 0)
217 return 0;
218 tv_add(now, &vsst->header_interval, &fc->next_header_time);
219 return 1;
220 }
221
222 static int num_slices(long unsigned bytes, struct fec_client *fc, uint8_t *result)
223 {
224 unsigned long m = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
225 unsigned rv, redundant_slices = fc->fcp->slices_per_group
226 - fc->fcp->data_slices_per_group;
227
228 if (!m)
229 return -E_BAD_CT;
230 rv = (bytes + m - 1) / m;
231 if (rv + redundant_slices > 255)
232 return -E_BAD_CT;
233 *result = rv;
234 return 1;
235 }
236
237 static void set_slice_duration(struct fec_client *fc, struct fec_group *g)
238 {
239 struct timeval group_duration, *chunk_tv = vss_chunk_time();
240
241 tv_scale(g->num_chunks, chunk_tv, &group_duration);
242 tv_divide(fc->fcp->slices_per_group + fc->num_extra_slices,
243 &group_duration, &g->slice_duration);
244 PARA_DEBUG_LOG("durations (group/chunk/slice): %lu/%lu/%lu\n",
245 tv2ms(&group_duration), tv2ms(chunk_tv), tv2ms(&g->slice_duration));
246 }
247
248 static int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
249 {
250 int ret, i, k, data_slices;
251 size_t len;
252 const char *buf, *start_buf;
253 struct timeval tmp, *chunk_tv = vss_chunk_time();
254 struct fec_group *g = &fc->group;
255 unsigned slice_bytes = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
256 uint32_t max_data_size;
257
258 assert(chunk_tv);
259 if (fc->first_stream_chunk < 0) {
260 uint8_t hs, ds; /* needed header/data slices */
261 uint8_t rs = fc->fcp->slices_per_group
262 - fc->fcp->data_slices_per_group; /* redundant slices */
263 int n;
264
265 ret = num_slices(vsst->header_len, fc, &hs);
266 if (ret < 0)
267 return ret;
268 ret = num_slices(afh_get_largest_chunk_size(&mmd->afd.afhi),
269 fc, &ds);
270 if (ret < 0)
271 return ret;
272 k = (int)hs + ds;
273 if (k > 255)
274 return -E_BAD_CT;
275 if (k < fc->fcp->data_slices_per_group)
276 k = fc->fcp->data_slices_per_group;
277 n = k + rs;
278 fc->num_extra_slices = k - fc->fcp->data_slices_per_group;
279 PARA_NOTICE_LOG("fec parms %d:%d:%d (%d extra slices)\n",
280 slice_bytes, k, n, fc->num_extra_slices);
281 fec_free(fc->parms);
282 fc->src_data = para_realloc(fc->src_data, k * sizeof(char *));
283 ret = fec_new(k, n, &fc->parms);
284 if (ret < 0)
285 return ret;
286 fc->stream_start = *now;
287 fc->first_stream_chunk = mmd->current_chunk;
288 g->first_chunk = mmd->current_chunk;
289 g->num = 0;
290 } else {
291 k = fc->fcp->data_slices_per_group + fc->num_extra_slices;
292 /* use duration of the previous group for the timing of this group */
293 set_slice_duration(fc, g);
294 g->first_chunk += g->num_chunks;
295 g->num++;
296 }
297 if (g->first_chunk >= mmd->afd.afhi.chunks_total)
298 return 0;
299 if (need_audio_header(fc, vsst)) {
300 ret = num_slices(vsst->header_len, fc, &g->num_header_slices);
301 if (ret < 0)
302 return ret;
303 } else
304 g->num_header_slices = 0;
305 afh_get_chunk(g->first_chunk, &mmd->afd.afhi, vsst->map, &start_buf,
306 &len);
307 data_slices = k - g->num_header_slices;
308 assert(data_slices);
309 max_data_size = slice_bytes * data_slices;
310 g->bytes = 0;
311 for (i = g->first_chunk; i < mmd->afd.afhi.chunks_total; i++) {
312 afh_get_chunk(i, &mmd->afd.afhi, vsst->map, &buf, &len);
313 if (g->bytes + len > max_data_size)
314 break;
315 g->bytes += len;
316 }
317 g->num_chunks = i - g->first_chunk;
318 assert(g->num_chunks);
319 fc->current_slice_num = 0;
320 if (g->num == 0)
321 set_slice_duration(fc, g);
322
323 /* setup header slices */
324 buf = vsst->header_buf;
325 for (i = 0; i < g->num_header_slices; i++) {
326 fc->src_data[i] = (const unsigned char *)buf;
327 buf += slice_bytes;
328 }
329
330 /* setup data slices */
331 buf = start_buf;
332 for (i = g->num_header_slices; i < k; i++) {
333 if (buf + slice_bytes > vsst->map + mmd->size)
334 /*
335 * Can not use the memory mapped audio file for this
336 * slice as it goes beyond the map. This slice will not
337 * be fully used.
338 */
339 break;
340 fc->src_data[i] = (const unsigned char *)buf;
341 buf += slice_bytes;
342 }
343 if (i < k) {
344 uint32_t payload_size = vsst->map + mmd->size - buf;
345 memcpy(fc->extra_src_buf, buf, payload_size);
346 fc->src_data[i] = fc->extra_src_buf;
347 i++;
348 /* use arbitrary data for all remaining slices */
349 buf = vsst->map;
350 for (; i < k; i++)
351 fc->src_data[i] = (const unsigned char *)buf;
352 }
353 PARA_DEBUG_LOG("FEC group %d: %d chunks (%d - %d), "
354 "%d header slices, %d data slices\n",
355 g->num, g->num_chunks, g->first_chunk,
356 g->first_chunk + g->num_chunks - 1,
357 g->num_header_slices, data_slices
358 );
359 /* set group start */
360 if (g->num != 0 && vsst->header_len != 0 && fc->first_stream_chunk == 0)
361 /* chunk #0 is the audio file header */
362 tv_scale(g->first_chunk - 1, chunk_tv, &tmp);
363 else
364 tv_scale(g->first_chunk - fc->first_stream_chunk,
365 chunk_tv, &tmp);
366 tv_add(&fc->stream_start, &tmp, &g->start);
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 /**
682 * Compute the timeout for the main select-loop of the scheduler.
683 *
684 * \param s Pointer to the server scheduler.
685 * \param t Pointer to the vss task structure.
686 *
687 * Before the timeout is computed, the current vss status flags are evaluated
688 * and acted upon by calling appropriate functions from the lower layers.
689 * Possible actions include
690 *
691 * - request a new audio file from afs,
692 * - shutdown of all senders (stop/pause command),
693 * - reposition the stream (ff/jmp command).
694 */
695 static void vss_pre_select(struct sched *s, struct task *t)
696 {
697 int i;
698 struct timeval *tv, diff;
699 struct vss_task *vsst = container_of(t, struct vss_task, task);
700
701 if (!vsst->map || vss_next() || vss_paused() || vss_repos()) {
702 struct fec_client *fc, *tmp;
703 for (i = 0; senders[i].name; i++)
704 if (senders[i].shutdown_clients)
705 senders[i].shutdown_clients();
706 list_for_each_entry_safe(fc, tmp, &fec_client_list, node) {
707 fc->first_stream_chunk = -1;
708 fc->error = 0;
709 }
710 mmd->stream_start.tv_sec = 0;
711 mmd->stream_start.tv_usec = 0;
712 }
713 if (vss_next())
714 vss_eof(vsst);
715 else if (vss_paused()) {
716 if (mmd->chunks_sent)
717 set_eof_barrier(vsst);
718 mmd->chunks_sent = 0;
719 } else if (vss_repos()) {
720 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
721 set_eof_barrier(vsst);
722 mmd->chunks_sent = 0;
723 mmd->current_chunk = mmd->repos_request;
724 mmd->new_vss_status_flags &= ~VSS_REPOS;
725 }
726 if (need_to_request_new_audio_file(vsst)) {
727 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
728 para_fd_set(vsst->afs_socket, &s->wfds, &s->max_fileno);
729 vsst->afsss = AFS_SOCKET_CHECK_FOR_WRITE;
730 } else
731 para_fd_set(vsst->afs_socket, &s->rfds, &s->max_fileno);
732 for (i = 0; senders[i].name; i++) {
733 if (!senders[i].pre_select)
734 continue;
735 senders[i].pre_select(&s->max_fileno, &s->rfds, &s->wfds);
736 }
737 tv = vss_compute_timeout(vsst);
738 if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
739 s->timeout = *tv;
740 }
741
742 static int recv_afs_msg(int afs_socket, int *fd, uint32_t *code, uint32_t *data)
743 {
744 char control[255], buf[8];
745 struct msghdr msg = {.msg_iov = NULL};
746 struct cmsghdr *cmsg;
747 struct iovec iov;
748 int ret = 0;
749
750 *fd = -1;
751 iov.iov_base = buf;
752 iov.iov_len = sizeof(buf);
753 msg.msg_iov = &iov;
754 msg.msg_iovlen = 1;
755 msg.msg_control = control;
756 msg.msg_controllen = sizeof(control);
757 memset(buf, 0, sizeof(buf));
758 ret = recvmsg(afs_socket, &msg, 0);
759 if (ret < 0)
760 return -ERRNO_TO_PARA_ERROR(errno);
761 if (iov.iov_len != sizeof(buf))
762 return -E_AFS_SHORT_READ;
763 *code = *(uint32_t*)buf;
764 *data = *(uint32_t*)(buf + 4);
765 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
766 if (cmsg->cmsg_level != SOL_SOCKET
767 || cmsg->cmsg_type != SCM_RIGHTS)
768 continue;
769 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
770 continue;
771 *fd = *(int *)CMSG_DATA(cmsg);
772 }
773 return 1;
774 }
775
776 static void recv_afs_result(struct vss_task *vsst)
777 {
778 int ret, passed_fd, shmid;
779 uint32_t afs_code = 0, afs_data = 0;
780 struct stat statbuf;
781
782 vsst->afsss = AFS_SOCKET_READY;
783 ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
784 if (ret < 0)
785 goto err;
786 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
787 afs_data);
788 ret = -E_NOFD;
789 if (afs_code != NEXT_AUDIO_FILE)
790 goto err;
791 if (passed_fd < 0)
792 goto err;
793 shmid = afs_data;
794 ret = load_afd(shmid, &mmd->afd);
795 if (ret < 0)
796 goto err;
797 shm_destroy(shmid);
798 ret = fstat(passed_fd, &statbuf);
799 if (ret < 0) {
800 PARA_ERROR_LOG("fstat error:\n");
801 ret = -ERRNO_TO_PARA_ERROR(errno);
802 goto err;
803 }
804 mmd->size = statbuf.st_size;
805 mmd->mtime = statbuf.st_mtime;
806 ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
807 0, &vsst->map);
808 if (ret < 0)
809 goto err;
810 close(passed_fd);
811 mmd->chunks_sent = 0;
812 mmd->current_chunk = 0;
813 mmd->offset = 0;
814 mmd->events++;
815 mmd->num_played++;
816 mmd->new_vss_status_flags &= (~VSS_NEXT);
817 afh_get_header(&mmd->afd.afhi, vsst->map, &vsst->header_buf,
818 &vsst->header_len);
819 return;
820 err:
821 free(mmd->afd.afhi.chunk_table);
822 if (passed_fd >= 0)
823 close(passed_fd);
824 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
825 mmd->new_vss_status_flags = VSS_NEXT;
826 }
827
828 /**
829 * Main sending function.
830 *
831 * This function gets called from vss_post_select(). It checks whether the next
832 * chunk of data should be pushed out. It obtains a pointer to the data to be
833 * sent out as well as its length from mmd->afd.afhi. This information is then
834 * passed to each supported sender's send() function as well as to the send()
835 * functions of each registered fec client.
836 */
837 static void vss_send(struct vss_task *vsst)
838 {
839 int i, fec_active = 0;
840 struct timeval due;
841 struct fec_client *fc, *tmp_fc;
842
843 if (!vsst->map || !vss_playing())
844 return;
845 if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
846 return;
847 if (chk_barrier("data send", &vsst->data_send_barrier,
848 &due, 1) < 0)
849 return;
850 list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
851 if (fc->error < 0)
852 continue;
853 if (!next_slice_is_due(fc, NULL)) {
854 fec_active = 1;
855 continue;
856 }
857 if (compute_next_fec_slice(fc, vsst) <= 0)
858 continue;
859 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc->group.num,
860 fc->current_slice_num, fc->fcp->max_slice_bytes);
861 fc->fcp->send((char *)fc->enc_buf,
862 fc->fcp->max_slice_bytes,
863 fc->fcp->private_data);
864 fc->current_slice_num++;
865 fec_active = 1;
866 }
867 if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
868 if (!fec_active)
869 mmd->new_vss_status_flags |= VSS_NEXT;
870 return;
871 }
872 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
873 &mmd->stream_start, &due);
874 if (tv_diff(&due, now, NULL) <= 0) {
875 const char *buf;
876 size_t len;
877
878 if (!mmd->chunks_sent) {
879 struct timeval tmp;
880 mmd->stream_start = *now;
881 tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &tmp);
882 mmd->offset = tv2ms(&tmp);
883 mmd->events++;
884 }
885 /*
886 * We call the send function also in case of empty chunks as
887 * they might have still some data queued which can be sent in
888 * this case.
889 */
890 afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
891 &buf, &len);
892 for (i = 0; senders[i].name; i++) {
893 if (!senders[i].send)
894 continue;
895 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
896 buf, len, vsst->header_buf, vsst->header_len);
897 }
898 mmd->chunks_sent++;
899 mmd->current_chunk++;
900 }
901 }
902
903 static void vss_post_select(struct sched *s, struct task *t)
904 {
905 int ret, i;
906 struct vss_task *vsst = container_of(t, struct vss_task, task);
907
908
909 if (mmd->sender_cmd_data.cmd_num >= 0) {
910 int num = mmd->sender_cmd_data.cmd_num,
911 sender_num = mmd->sender_cmd_data.sender_num;
912
913 if (senders[sender_num].client_cmds[num])
914 senders[sender_num].client_cmds[num](&mmd->sender_cmd_data);
915 mmd->sender_cmd_data.cmd_num = -1;
916 }
917 if (vsst->afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
918 if (FD_ISSET(vsst->afs_socket, &s->rfds))
919 recv_afs_result(vsst);
920 } else if (FD_ISSET(vsst->afs_socket, &s->wfds)) {
921 PARA_NOTICE_LOG("requesting new fd from afs\n");
922 ret = send_buffer(vsst->afs_socket, "new");
923 if (ret < 0)
924 PARA_CRIT_LOG("%s\n", para_strerror(-ret));
925 else
926 vsst->afsss = AFS_SOCKET_AFD_PENDING;
927 }
928 for (i = 0; senders[i].name; i++) {
929 if (!senders[i].post_select)
930 continue;
931 senders[i].post_select(&s->rfds, &s->wfds);
932 }
933 if ((vss_playing() && !(mmd->vss_status_flags & VSS_PLAYING)) ||
934 (vss_next() && vss_playing()))
935 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
936 vss_send(vsst);
937 }
938
939 /**
940 * Initialize the virtual streaming system task.
941 *
942 * \param afs_socket The fd for communication with afs.
943 *
944 * This also initializes all supported senders and starts streaming
945 * if the --autoplay command line flag was given.
946 */
947 void init_vss_task(int afs_socket)
948 {
949 static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
950 int i;
951 char *hn = para_hostname(), *home = para_homedir();
952 long unsigned announce_time = conf.announce_time_arg > 0?
953 conf.announce_time_arg : 300,
954 autoplay_delay = conf.autoplay_delay_arg > 0?
955 conf.autoplay_delay_arg : 0;
956 vsst->header_interval.tv_sec = 5; /* should this be configurable? */
957 vsst->afs_socket = afs_socket;
958 vsst->task.pre_select = vss_pre_select;
959 vsst->task.post_select = vss_post_select;
960 ms2tv(announce_time, &vsst->announce_tv);
961 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst->announce_tv));
962 INIT_LIST_HEAD(&fec_client_list);
963 for (i = 0; senders[i].name; i++) {
964 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
965 senders[i].init(&senders[i]);
966 }
967 free(hn);
968 free(home);
969 mmd->sender_cmd_data.cmd_num = -1;
970 if (conf.autoplay_given) {
971 struct timeval tmp;
972 mmd->vss_status_flags |= VSS_PLAYING;
973 mmd->new_vss_status_flags |= VSS_PLAYING;
974 ms2tv(autoplay_delay, &tmp);
975 tv_add(now, &tmp, &vsst->autoplay_barrier);
976 tv_add(&vsst->autoplay_barrier, &vsst->announce_tv,
977 &vsst->data_send_barrier);
978 }
979 register_task(&vsst->task);
980 }