Merge commit 'meins/maint' into 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 <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 /** Time between audio file headers are sent. */
91 struct timeval header_interval;
92 };
93
94 /**
95 * The list of currently connected fec clients.
96 *
97 * Senders may use \ref vss_add_fec_client() to add entries to the list.
98 */
99 static struct list_head fec_client_list;
100
101 /**
102 * Data associated with one FEC group.
103 *
104 * A FEC group consists of a fixed number of slices and this number is given by
105 * the \a slices_per_group parameter of struct \ref fec_client_parms. Each FEC
106 * group contains a number of chunks of the current audio file.
107 *
108 * FEC slices directly correspond to the data packages sent by the paraslash
109 * senders that use FEC. Each slice is identified by its group number and its
110 * number within the group. All slices have the same size, but the last slice
111 * of the group may not be filled entirely.
112 */
113 struct fec_group {
114 /** The number of the FEC group. */
115 uint32_t num;
116 /** Number of bytes in this group. */
117 uint32_t bytes;
118 /** The first chunk of the current audio file belonging to the group. */
119 uint32_t first_chunk;
120 /** The number of chunks contained in this group. */
121 uint32_t num_chunks;
122 /** When the first chunk was sent. */
123 struct timeval start;
124 /** The group duration divided by the number of slices. */
125 struct timeval slice_duration;
126 /** Group contains the audio file header that occupies that many slices. */
127 uint8_t num_header_slices;
128 };
129
130 /**
131 * Describes one connected FEC client.
132 */
133 struct fec_client {
134 /** If negative, this client is temporarily disabled. */
135 int error;
136 /** Parameters requested by the client. */
137 struct fec_client_parms *fcp;
138 /** Used by the core FEC code. */
139 struct fec_parms *parms;
140 /** The position of this client in the fec client list. */
141 struct list_head node;
142 /** When the first slice for this client was sent. */
143 struct timeval stream_start;
144 /** The first chunk sent to this FEC client. */
145 int first_stream_chunk;
146 /** Describes the current group. */
147 struct fec_group group;
148 /** The current slice. */
149 uint8_t current_slice_num;
150 /** The data to be FEC-encoded (point to a region within the mapped audio file). */
151 const unsigned char **src_data;
152 /** Last time an audio header was sent. */
153 struct timeval next_header_time;
154 /** Used for the last source pointer of an audio file. */
155 unsigned char *extra_src_buf;
156 /** Extra slices needed to store largest chunk + header. */
157 int num_extra_slices;
158 /** Contains the FEC-encoded data. */
159 unsigned char *enc_buf;
160 };
161
162 /**
163 * Get the chunk time of the current audio file.
164 *
165 * \return A pointer to a struct containing the chunk time, or NULL,
166 * if currently no audio file is selected.
167 */
168 struct timeval *vss_chunk_time(void)
169 {
170 if (mmd->afd.afhi.chunk_tv.tv_sec == 0 &&
171 mmd->afd.afhi.chunk_tv.tv_usec == 0)
172 return NULL;
173 return &mmd->afd.afhi.chunk_tv;
174 }
175
176 /**
177 * Write a fec header to a buffer.
178 *
179 * \param buf The buffer to write to.
180 * \param h The fec header to write.
181 */
182 static void write_fec_header(struct fec_client *fc, struct vss_task *vsst)
183 {
184 char *buf = (char *)fc->enc_buf;
185 struct fec_group *g = &fc->group;
186 struct fec_client_parms *p = fc->fcp;
187
188 write_u32(buf, FEC_MAGIC);
189
190 write_u8(buf + 4, p->slices_per_group + fc->num_extra_slices);
191 write_u8(buf + 5, p->data_slices_per_group + fc->num_extra_slices);
192 write_u32(buf + 6, g->num_header_slices? vsst->header_len : 0);
193
194 write_u32(buf + 10, g->num);
195 write_u32(buf + 14, g->bytes);
196
197 write_u8(buf + 18, fc->current_slice_num);
198 write_u16(buf + 20, p->max_slice_bytes - FEC_HEADER_SIZE);
199 write_u8(buf + 22, g->first_chunk? 0 : 1);
200 write_u8(buf + 23, vsst->header_len? 1 : 0);
201 memset(buf + 24, 0, 7);
202 }
203
204 static int need_audio_header(struct fec_client *fc, struct vss_task *vsst)
205 {
206 if (!mmd->current_chunk) {
207 tv_add(now, &vsst->header_interval, &fc->next_header_time);
208 return 0;
209 }
210 if (!vsst->header_buf)
211 return 0;
212 if (!vsst->header_len)
213 return 0;
214 if (fc->group.num && tv_diff(&fc->next_header_time, now, NULL) > 0)
215 return 0;
216 tv_add(now, &vsst->header_interval, &fc->next_header_time);
217 return 1;
218 }
219
220 static int num_slices(long unsigned bytes, struct fec_client *fc, uint8_t *result)
221 {
222 unsigned long m = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
223 unsigned rv, redundant_slices = fc->fcp->slices_per_group
224 - fc->fcp->data_slices_per_group;
225
226 if (!m)
227 return -E_BAD_CT;
228 rv = (bytes + m - 1) / m;
229 if (rv + redundant_slices > 255)
230 return -E_BAD_CT;
231 *result = rv;
232 return 1;
233 }
234
235 static void set_slice_duration(struct fec_client *fc, struct fec_group *g)
236 {
237 struct timeval group_duration, *chunk_tv = vss_chunk_time();
238
239 tv_scale(g->num_chunks, chunk_tv, &group_duration);
240 tv_divide(fc->fcp->slices_per_group + fc->num_extra_slices,
241 &group_duration, &g->slice_duration);
242 PARA_DEBUG_LOG("durations (group/chunk/slice): %lu/%lu/%lu\n",
243 tv2ms(&group_duration), tv2ms(chunk_tv), tv2ms(&g->slice_duration));
244 }
245
246 static int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
247 {
248 int ret, i, k, data_slices;
249 size_t len;
250 const char *buf, *start_buf;
251 struct timeval tmp, *chunk_tv = vss_chunk_time();
252 struct fec_group *g = &fc->group;
253 unsigned slice_bytes = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
254 uint32_t max_data_size;
255
256 assert(chunk_tv);
257 if (fc->first_stream_chunk < 0) {
258 uint8_t hs, ds; /* needed header/data slices */
259 uint8_t rs = fc->fcp->slices_per_group
260 - fc->fcp->data_slices_per_group; /* redundant slices */
261 int n;
262
263 ret = num_slices(vsst->header_len, fc, &hs);
264 if (ret < 0)
265 return ret;
266 ret = num_slices(afh_get_largest_chunk_size(&mmd->afd.afhi),
267 fc, &ds);
268 if (ret < 0)
269 return ret;
270 k = (int)hs + ds;
271 if (k > 255)
272 return -E_BAD_CT;
273 if (k < fc->fcp->data_slices_per_group)
274 k = fc->fcp->data_slices_per_group;
275 n = k + rs;
276 fc->num_extra_slices = k - fc->fcp->data_slices_per_group;
277 PARA_NOTICE_LOG("fec parms %d:%d:%d (%d extra slices)\n",
278 slice_bytes, k, n, fc->num_extra_slices);
279 fec_free(fc->parms);
280 fc->src_data = para_realloc(fc->src_data, k * sizeof(char *));
281 ret = fec_new(k, n, &fc->parms);
282 if (ret < 0)
283 return ret;
284 fc->stream_start = *now;
285 fc->first_stream_chunk = mmd->current_chunk;
286 g->first_chunk = mmd->current_chunk;
287 g->num = 0;
288 } else {
289 k = fc->fcp->data_slices_per_group + fc->num_extra_slices;
290 /* use duration of the previous group for the timing of this group */
291 set_slice_duration(fc, g);
292 g->first_chunk += g->num_chunks;
293 g->num++;
294 }
295 if (g->first_chunk >= mmd->afd.afhi.chunks_total)
296 return 0;
297 if (need_audio_header(fc, vsst)) {
298 ret = num_slices(vsst->header_len, fc, &g->num_header_slices);
299 if (ret < 0)
300 return ret;
301 } else
302 g->num_header_slices = 0;
303 afh_get_chunk(g->first_chunk, &mmd->afd.afhi, vsst->map, &start_buf,
304 &len);
305 data_slices = k - g->num_header_slices;
306 assert(data_slices);
307 max_data_size = slice_bytes * data_slices;
308 g->bytes = 0;
309 for (i = g->first_chunk; i < mmd->afd.afhi.chunks_total; i++) {
310 afh_get_chunk(i, &mmd->afd.afhi, vsst->map, &buf, &len);
311 if (g->bytes + len > max_data_size)
312 break;
313 g->bytes += len;
314 }
315 g->num_chunks = i - g->first_chunk;
316 assert(g->num_chunks);
317 fc->current_slice_num = 0;
318 if (g->num == 0)
319 set_slice_duration(fc, g);
320
321 /* setup header slices */
322 buf = vsst->header_buf;
323 for (i = 0; i < g->num_header_slices; i++) {
324 fc->src_data[i] = (const unsigned char *)buf;
325 buf += slice_bytes;
326 }
327
328 /* setup data slices */
329 buf = start_buf;
330 for (i = g->num_header_slices; i < k; i++) {
331 if (buf + slice_bytes > vsst->map + mmd->size)
332 /*
333 * Can not use the memory mapped audio file for this
334 * slice as it goes beyond the map. This slice will not
335 * be fully used.
336 */
337 break;
338 fc->src_data[i] = (const unsigned char *)buf;
339 buf += slice_bytes;
340 }
341 if (i < k) {
342 uint32_t payload_size = vsst->map + mmd->size - buf;
343 memcpy(fc->extra_src_buf, buf, payload_size);
344 fc->src_data[i] = fc->extra_src_buf;
345 i++;
346 /* use arbitrary data for all remaining slices */
347 buf = vsst->map;
348 for (; i < k; i++)
349 fc->src_data[i] = (const unsigned char *)buf;
350 }
351 PARA_DEBUG_LOG("FEC group %d: %d chunks (%d - %d), "
352 "%d header slices, %d data slices\n",
353 g->num, g->num_chunks, g->first_chunk,
354 g->first_chunk + g->num_chunks - 1,
355 g->num_header_slices, data_slices
356 );
357 /* set group start */
358 if (g->num != 0 && vsst->header_len != 0 && fc->first_stream_chunk == 0)
359 /* chunk #0 is the audio file header */
360 tv_scale(g->first_chunk - 1, chunk_tv, &tmp);
361 else
362 tv_scale(g->first_chunk - fc->first_stream_chunk,
363 chunk_tv, &tmp);
364 tv_add(&fc->stream_start, &tmp, &g->start);
365 return 1;
366 }
367
368 static int compute_next_fec_slice(struct fec_client *fc, struct vss_task *vsst)
369 {
370 assert(fc->error >= 0);
371 if (fc->first_stream_chunk < 0 || fc->current_slice_num
372 == fc->fcp->slices_per_group + fc->num_extra_slices) {
373 int ret = setup_next_fec_group(fc, vsst);
374 if (ret == 0)
375 return 0;
376 if (ret < 0) {
377 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
378 PARA_ERROR_LOG("FEC client temporarily disabled\n");
379 fc->error = ret;
380 return fc->error;
381 }
382 }
383 write_fec_header(fc, vsst);
384 fec_encode(fc->parms, fc->src_data, fc->enc_buf + FEC_HEADER_SIZE,
385 fc->current_slice_num,
386 fc->fcp->max_slice_bytes - FEC_HEADER_SIZE);
387 return 1;
388 }
389
390 /**
391 * Return a buffer that marks the end of the stream.
392 *
393 * \param buf Result pointer.
394 * \return The length of the eof buffer.
395 *
396 * This is used for (multicast) udp streaming where closing the socket on the
397 * sender might not give rise to an eof condition at the peer.
398 */
399 size_t vss_get_fec_eof_packet(const char **buf)
400 {
401 static const char fec_eof_packet[FEC_HEADER_SIZE] = FEC_EOF_PACKET;
402 *buf = fec_eof_packet;
403 return FEC_HEADER_SIZE;
404 }
405
406 /**
407 * Add one entry to the list of active fec clients.
408 *
409 * \param fcp Describes the fec parameters to be used for this client.
410 * \param result An opaque pointer that must be used by remove the client later.
411 *
412 * \return Standard.
413 */
414 int vss_add_fec_client(struct fec_client_parms *fcp, struct fec_client **result)
415 {
416 int ret;
417 struct fec_client *fc;
418
419 if (fcp->max_slice_bytes < FEC_HEADER_SIZE + fcp->data_slices_per_group)
420 return -ERRNO_TO_PARA_ERROR(EINVAL);
421 fc = para_calloc(sizeof(*fc));
422 fc->fcp = fcp;
423 ret = fec_new(fcp->data_slices_per_group, fcp->slices_per_group,
424 &fc->parms);
425 if (ret < 0)
426 goto err;
427 fc->first_stream_chunk = -1; /* stream not yet started */
428 fc->src_data = para_malloc(fc->fcp->slices_per_group * sizeof(char *));
429 fc->enc_buf = para_calloc(fc->fcp->max_slice_bytes);
430 fc->num_extra_slices = 0;
431 fc->extra_src_buf = para_calloc(fc->fcp->max_slice_bytes);
432 fc->next_header_time.tv_sec = 0;
433 para_list_add(&fc->node, &fec_client_list);
434 *result = fc;
435 return 1;
436 err:
437 fec_free(fc->parms);
438 free(fc);
439 *result = NULL;
440 return ret;
441 }
442
443 /**
444 * Remove one entry from the list of active fec clients.
445 *
446 * \param fc The client to be removed.
447 */
448 void vss_del_fec_client(struct fec_client *fc)
449 {
450 list_del(&fc->node);
451 free(fc->src_data);
452 free(fc->enc_buf);
453 free(fc->extra_src_buf);
454 fec_free(fc->parms);
455 free(fc);
456 }
457
458 /*
459 * Compute if/when next slice is due. If it isn't due yet and \a diff is
460 * not \p Null, compute the time difference next - now, where
461 *
462 * next = stream_start + (first_group_chunk - first_stream_chunk)
463 * * chunk_time + slice_num * slice_time
464 */
465 static int next_slice_is_due(struct fec_client *fc, struct timeval *diff)
466 {
467 struct timeval tmp, next;
468 int ret;
469
470 if (fc->first_stream_chunk < 0)
471 return 1;
472 tv_scale(fc->current_slice_num, &fc->group.slice_duration, &tmp);
473 tv_add(&tmp, &fc->group.start, &next);
474 ret = tv_diff(&next, now, diff);
475 return ret < 0? 1 : 0;
476 }
477
478 static void compute_slice_timeout(struct timeval *timeout)
479 {
480 struct fec_client *fc;
481
482 assert(vss_playing());
483 list_for_each_entry(fc, &fec_client_list, node) {
484 struct timeval diff;
485
486 if (fc->error < 0)
487 continue;
488 if (next_slice_is_due(fc, &diff)) {
489 timeout->tv_sec = 0;
490 timeout->tv_usec = 0;
491 return;
492 }
493 /* timeout = min(timeout, diff) */
494 if (tv_diff(&diff, timeout, NULL) < 0)
495 *timeout = diff;
496 }
497 }
498
499 static void set_eof_barrier(struct vss_task *vsst)
500 {
501 struct fec_client *fc;
502 struct timeval timeout = mmd->afd.afhi.eof_tv,
503 *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 free(mmd->afd.afhi.info_string);
646 mmd->afd.afhi.info_string = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_FILE_INFO],
647 status_item_list[SI_TAGINFO1], status_item_list[SI_TAGINFO2]);
648 make_empty_status_items(mmd->afd.verbose_ls_output);
649 mmd->mtime = 0;
650 mmd->size = 0;
651 mmd->events++;
652 }
653
654 /**
655 * Get the list of all supported audio formats.
656 *
657 * \return Aa space separated list of all supported audio formats
658 * It is not allocated at runtime, i.e. there is no need to free
659 * the returned string in the caller.
660 */
661 const char *supported_audio_formats(void)
662 {
663 return SUPPORTED_AUDIO_FORMATS;
664 }
665
666 static int need_to_request_new_audio_file(struct vss_task *vsst)
667 {
668 struct timeval diff;
669
670 if (vsst->map) /* have audio file */
671 return 0;
672 if (!vss_playing()) /* don't need one */
673 return 0;
674 if (mmd->new_vss_status_flags & VSS_NOMORE)
675 return 0;
676 if (vsst->afsss == AFS_SOCKET_AFD_PENDING) /* already requested one */
677 return 0;
678 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
679 &diff, 1) < 0)
680 return 0;
681 return 1;
682 }
683
684 /**
685 * Compute the timeout for the main select-loop of the scheduler.
686 *
687 * \param s Pointer to the server scheduler.
688 * \param t Pointer to the vss task structure.
689 *
690 * Before the timeout is computed, the current vss status flags are evaluated
691 * and acted upon by calling appropriate functions from the lower layers.
692 * Possible actions include
693 *
694 * - request a new audio file from afs,
695 * - shutdown of all senders (stop/pause command),
696 * - reposition the stream (ff/jmp command).
697 */
698 static void vss_pre_select(struct sched *s, struct task *t)
699 {
700 int i;
701 struct timeval *tv, diff;
702 struct vss_task *vsst = container_of(t, struct vss_task, task);
703
704 if (!vsst->map || vss_next() || vss_paused() || vss_repos()) {
705 struct fec_client *fc, *tmp;
706 for (i = 0; senders[i].name; i++)
707 if (senders[i].shutdown_clients)
708 senders[i].shutdown_clients();
709 list_for_each_entry_safe(fc, tmp, &fec_client_list, node) {
710 fc->first_stream_chunk = -1;
711 fc->error = 0;
712 }
713 mmd->stream_start.tv_sec = 0;
714 mmd->stream_start.tv_usec = 0;
715 }
716 if (vss_next())
717 vss_eof(vsst);
718 else if (vss_paused()) {
719 if (mmd->chunks_sent)
720 set_eof_barrier(vsst);
721 mmd->chunks_sent = 0;
722 } else if (vss_repos()) {
723 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
724 set_eof_barrier(vsst);
725 mmd->chunks_sent = 0;
726 mmd->current_chunk = mmd->repos_request;
727 mmd->new_vss_status_flags &= ~VSS_REPOS;
728 }
729 if (need_to_request_new_audio_file(vsst)) {
730 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
731 para_fd_set(vsst->afs_socket, &s->wfds, &s->max_fileno);
732 vsst->afsss = AFS_SOCKET_CHECK_FOR_WRITE;
733 } else
734 para_fd_set(vsst->afs_socket, &s->rfds, &s->max_fileno);
735 for (i = 0; senders[i].name; i++) {
736 if (!senders[i].pre_select)
737 continue;
738 senders[i].pre_select(&s->max_fileno, &s->rfds, &s->wfds);
739 }
740 tv = vss_compute_timeout(vsst);
741 if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
742 s->timeout = *tv;
743 }
744
745 static int recv_afs_msg(int afs_socket, int *fd, uint32_t *code, uint32_t *data)
746 {
747 char control[255], buf[8];
748 struct msghdr msg = {.msg_iov = NULL};
749 struct cmsghdr *cmsg;
750 struct iovec iov;
751 int ret = 0;
752
753 *fd = -1;
754 iov.iov_base = buf;
755 iov.iov_len = sizeof(buf);
756 msg.msg_iov = &iov;
757 msg.msg_iovlen = 1;
758 msg.msg_control = control;
759 msg.msg_controllen = sizeof(control);
760 memset(buf, 0, sizeof(buf));
761 ret = recvmsg(afs_socket, &msg, 0);
762 if (ret < 0)
763 return -ERRNO_TO_PARA_ERROR(errno);
764 if (iov.iov_len != sizeof(buf))
765 return -E_AFS_SHORT_READ;
766 *code = *(uint32_t*)buf;
767 *data = *(uint32_t*)(buf + 4);
768 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
769 if (cmsg->cmsg_level != SOL_SOCKET
770 || cmsg->cmsg_type != SCM_RIGHTS)
771 continue;
772 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
773 continue;
774 *fd = *(int *)CMSG_DATA(cmsg);
775 }
776 return 1;
777 }
778
779 static void recv_afs_result(struct vss_task *vsst)
780 {
781 int ret, passed_fd, shmid;
782 uint32_t afs_code = 0, afs_data = 0;
783 struct stat statbuf;
784
785 vsst->afsss = AFS_SOCKET_READY;
786 ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
787 if (ret < 0)
788 goto err;
789 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
790 afs_data);
791 ret = -E_NOFD;
792 if (afs_code != NEXT_AUDIO_FILE)
793 goto err;
794 if (passed_fd < 0)
795 goto err;
796 shmid = afs_data;
797 free(mmd->afd.afhi.info_string);
798 ret = load_afd(shmid, &mmd->afd);
799 if (ret < 0)
800 goto err;
801 shm_destroy(shmid);
802 ret = fstat(passed_fd, &statbuf);
803 if (ret < 0) {
804 PARA_ERROR_LOG("fstat error:\n");
805 ret = -ERRNO_TO_PARA_ERROR(errno);
806 goto err;
807 }
808 mmd->size = statbuf.st_size;
809 mmd->mtime = statbuf.st_mtime;
810 ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
811 0, &vsst->map);
812 if (ret < 0)
813 goto err;
814 close(passed_fd);
815 mmd->chunks_sent = 0;
816 mmd->current_chunk = 0;
817 mmd->offset = 0;
818 mmd->events++;
819 mmd->num_played++;
820 mmd->new_vss_status_flags &= (~VSS_NEXT);
821 afh_get_header(&mmd->afd.afhi, vsst->map, &vsst->header_buf,
822 &vsst->header_len);
823 return;
824 err:
825 free(mmd->afd.afhi.chunk_table);
826 if (passed_fd >= 0)
827 close(passed_fd);
828 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
829 mmd->new_vss_status_flags = VSS_NEXT;
830 }
831
832 /**
833 * Main sending function.
834 *
835 * This function gets called from vss_post_select(). It checks whether the next
836 * chunk of data should be pushed out. It obtains a pointer to the data to be
837 * sent out as well as its length from mmd->afd.afhi. This information is then
838 * passed to each supported sender's send() function as well as to the send()
839 * functions of each registered fec client.
840 */
841 static void vss_send(struct vss_task *vsst)
842 {
843 int i, fec_active = 0;
844 struct timeval due;
845 struct fec_client *fc, *tmp_fc;
846
847 if (!vsst->map || !vss_playing())
848 return;
849 if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
850 return;
851 if (chk_barrier("data send", &vsst->data_send_barrier,
852 &due, 1) < 0)
853 return;
854 list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
855 if (fc->error < 0)
856 continue;
857 if (!next_slice_is_due(fc, NULL)) {
858 fec_active = 1;
859 continue;
860 }
861 if (compute_next_fec_slice(fc, vsst) <= 0)
862 continue;
863 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc->group.num,
864 fc->current_slice_num, fc->fcp->max_slice_bytes);
865 fc->fcp->send((char *)fc->enc_buf,
866 fc->fcp->max_slice_bytes,
867 fc->fcp->private_data);
868 fc->current_slice_num++;
869 fec_active = 1;
870 }
871 if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
872 if (!fec_active)
873 mmd->new_vss_status_flags |= VSS_NEXT;
874 return;
875 }
876 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
877 &mmd->stream_start, &due);
878 if (tv_diff(&due, now, NULL) <= 0) {
879 const char *buf;
880 size_t len;
881
882 if (!mmd->chunks_sent) {
883 struct timeval tmp;
884 mmd->stream_start = *now;
885 tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &tmp);
886 mmd->offset = tv2ms(&tmp);
887 mmd->events++;
888 }
889 /*
890 * We call the send function also in case of empty chunks as
891 * they might have still some data queued which can be sent in
892 * this case.
893 */
894 afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
895 &buf, &len);
896 for (i = 0; senders[i].name; i++) {
897 if (!senders[i].send)
898 continue;
899 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
900 buf, len, vsst->header_buf, vsst->header_len);
901 }
902 mmd->chunks_sent++;
903 mmd->current_chunk++;
904 }
905 }
906
907 static void vss_post_select(struct sched *s, struct task *t)
908 {
909 int ret, i;
910 struct vss_task *vsst = container_of(t, struct vss_task, task);
911
912
913 if (mmd->sender_cmd_data.cmd_num >= 0) {
914 int num = mmd->sender_cmd_data.cmd_num,
915 sender_num = mmd->sender_cmd_data.sender_num;
916
917 if (senders[sender_num].client_cmds[num])
918 senders[sender_num].client_cmds[num](&mmd->sender_cmd_data);
919 mmd->sender_cmd_data.cmd_num = -1;
920 }
921 if (vsst->afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
922 if (FD_ISSET(vsst->afs_socket, &s->rfds))
923 recv_afs_result(vsst);
924 } else if (FD_ISSET(vsst->afs_socket, &s->wfds)) {
925 PARA_NOTICE_LOG("requesting new fd from afs\n");
926 ret = send_buffer(vsst->afs_socket, "new");
927 if (ret < 0)
928 PARA_CRIT_LOG("%s\n", para_strerror(-ret));
929 else
930 vsst->afsss = AFS_SOCKET_AFD_PENDING;
931 }
932 for (i = 0; senders[i].name; i++) {
933 if (!senders[i].post_select)
934 continue;
935 senders[i].post_select(&s->rfds, &s->wfds);
936 }
937 if ((vss_playing() && !(mmd->vss_status_flags & VSS_PLAYING)) ||
938 (vss_next() && vss_playing()))
939 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
940 vss_send(vsst);
941 }
942
943 /**
944 * Initialize the virtual streaming system task.
945 *
946 * \param afs_socket The fd for communication with afs.
947 *
948 * This also initializes all supported senders and starts streaming
949 * if the --autoplay command line flag was given.
950 */
951 void init_vss_task(int afs_socket)
952 {
953 static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
954 int i;
955 char *hn = para_hostname(), *home = para_homedir();
956 long unsigned announce_time = conf.announce_time_arg > 0?
957 conf.announce_time_arg : 300,
958 autoplay_delay = conf.autoplay_delay_arg > 0?
959 conf.autoplay_delay_arg : 0;
960 vsst->header_interval.tv_sec = 5; /* should this be configurable? */
961 vsst->afs_socket = afs_socket;
962 vsst->task.pre_select = vss_pre_select;
963 vsst->task.post_select = vss_post_select;
964 ms2tv(announce_time, &vsst->announce_tv);
965 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst->announce_tv));
966 INIT_LIST_HEAD(&fec_client_list);
967 for (i = 0; senders[i].name; i++) {
968 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
969 senders[i].init(&senders[i]);
970 }
971 free(hn);
972 free(home);
973 mmd->sender_cmd_data.cmd_num = -1;
974 make_empty_status_items(mmd->afd.verbose_ls_output);
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 }