Merge branch 'master' into next
[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 int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
238 {
239 int ret, i, k, data_slices;
240 size_t len;
241 const char *buf, *start_buf;
242 struct timeval tmp, *chunk_tv = vss_chunk_time();
243 struct fec_group *g = &fc->group;
244 unsigned slice_bytes = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
245 uint32_t max_data_size;
246
247 assert(chunk_tv);
248 k = fc->fcp->data_slices_per_group + fc->num_extra_slices;
249 if (fc->first_stream_chunk < 0) {
250 uint32_t largest = afh_get_largest_chunk_size(&mmd->afd.afhi)
251 + vsst->header_len;
252 uint8_t needed, want;
253
254 ret = num_slices(largest, fc, &needed);
255 if (ret < 0)
256 return ret;
257 if (needed > fc->fcp->data_slices_per_group)
258 PARA_WARNING_LOG("fec parms insufficient for this audio file\n");
259 want = PARA_MAX(needed, fc->fcp->data_slices_per_group);
260 if (want != k) {
261 fec_free(fc->parms);
262 fc->src_data = para_realloc(fc->src_data, want * sizeof(char *));
263 ret = fec_new(want, want + fc->fcp->slices_per_group
264 - fc->fcp->data_slices_per_group, &fc->parms);
265 if (ret < 0)
266 return ret;
267 k = want;
268 fc->num_extra_slices = 0;
269 if (k > fc->fcp->data_slices_per_group) {
270 fc->num_extra_slices = k - fc->fcp->data_slices_per_group;
271 PARA_NOTICE_LOG("using %d extra slices\n",
272 fc->num_extra_slices);
273 }
274 }
275 fc->stream_start = *now;
276 fc->first_stream_chunk = mmd->current_chunk;
277 g->first_chunk = mmd->current_chunk;
278 g->num = 0;
279 } else {
280 g->first_chunk += g->num_chunks;
281 g->num++;
282 }
283 if (g->first_chunk >= mmd->afd.afhi.chunks_total)
284 return 0;
285 if (need_audio_header(fc, vsst)) {
286 ret = num_slices(vsst->header_len, fc, &g->num_header_slices);
287 if (ret < 0)
288 return ret;
289 } else
290 g->num_header_slices = 0;
291 afh_get_chunk(g->first_chunk, &mmd->afd.afhi, vsst->map, &start_buf,
292 &len);
293 data_slices = k - g->num_header_slices;
294 assert(data_slices);
295 max_data_size = slice_bytes * data_slices;
296 g->bytes = 0;
297 for (i = g->first_chunk; i < mmd->afd.afhi.chunks_total; i++) {
298 afh_get_chunk(i, &mmd->afd.afhi, vsst->map, &buf, &len);
299 if (g->bytes + len > max_data_size)
300 break;
301 g->bytes += len;
302 }
303 g->num_chunks = i - g->first_chunk;
304 assert(g->num_chunks);
305 fc->current_slice_num = 0;
306
307 /* setup header slices */
308 buf = vsst->header_buf;
309 for (i = 0; i < g->num_header_slices; i++) {
310 fc->src_data[i] = (const unsigned char *)buf;
311 buf += slice_bytes;
312 }
313
314 /* setup data slices */
315 buf = start_buf;
316 for (i = g->num_header_slices; i < k; i++) {
317 if (buf + slice_bytes > vsst->map + mmd->size)
318 /*
319 * Can not use the memory mapped audio file for this
320 * slice as it goes beyond the map. This slice will not
321 * be fully used.
322 */
323 break;
324 fc->src_data[i] = (const unsigned char *)buf;
325 buf += slice_bytes;
326 }
327 if (i < k) {
328 uint32_t payload_size = vsst->map + mmd->size - buf;
329 memcpy(fc->extra_src_buf, buf, payload_size);
330 fc->src_data[i] = fc->extra_src_buf;
331 i++;
332 /* use arbitrary data for all remaining slices */
333 buf = vsst->map;
334 for (; i < k; i++)
335 fc->src_data[i] = (const unsigned char *)buf;
336 }
337
338 /* setup group timing */
339 tv_scale(g->first_chunk - fc->first_stream_chunk, chunk_tv, &tmp);
340 tv_add(&fc->stream_start, &tmp, &g->start);
341 tv_scale(g->num_chunks, chunk_tv, &tmp); /* group duration */
342 tv_divide(fc->fcp->slices_per_group + fc->num_extra_slices,
343 &tmp, &g->slice_duration);
344
345 PARA_DEBUG_LOG("FEC group %d: %d chunks (%d - %d), %d header slices, %d data slices\n",
346 g->num, g->num_chunks, g->first_chunk,
347 g->first_chunk + g->num_chunks - 1,
348 g->num_header_slices, data_slices
349 );
350 PARA_DEBUG_LOG("durations (group/chunk/slice): %lu/%lu/%lu\n",
351 tv2ms(&tmp), tv2ms(chunk_tv), tv2ms(&g->slice_duration));
352 return 1;
353 }
354
355 static int compute_next_fec_slice(struct fec_client *fc, struct vss_task *vsst)
356 {
357 assert(fc->error >= 0);
358 if (fc->first_stream_chunk < 0 || fc->current_slice_num
359 == fc->fcp->slices_per_group + fc->num_extra_slices) {
360 int ret = setup_next_fec_group(fc, vsst);
361 if (ret == 0)
362 return 0;
363 if (ret < 0) {
364 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
365 PARA_ERROR_LOG("FEC client temporarily disabled\n");
366 fc->error = ret;
367 return fc->error;
368 }
369 }
370 write_fec_header(fc, vsst);
371 fec_encode(fc->parms, fc->src_data, fc->enc_buf + FEC_HEADER_SIZE,
372 fc->current_slice_num,
373 fc->fcp->max_slice_bytes - FEC_HEADER_SIZE);
374 return 1;
375 }
376
377 /**
378 * Return a buffer that marks the end of the stream.
379 *
380 * \param buf Result pointer.
381 * \return The length of the eof buffer.
382 *
383 * This is used for (multicast) udp streaming where closing the socket on the
384 * sender might not give rise to an eof condition at the peer.
385 */
386 size_t vss_get_fec_eof_packet(const char **buf)
387 {
388 static const char fec_eof_packet[FEC_HEADER_SIZE] = FEC_EOF_PACKET;
389 *buf = fec_eof_packet;
390 return FEC_HEADER_SIZE;
391 }
392
393 /**
394 * Add one entry to the list of active fec clients.
395 *
396 * \param fcp Describes the fec parameters to be used for this client.
397 * \param result An opaque pointer that must be used by remove the client later.
398 *
399 * \return Standard.
400 */
401 int vss_add_fec_client(struct fec_client_parms *fcp, struct fec_client **result)
402 {
403 int ret;
404 struct fec_client *fc;
405
406 if (fcp->max_slice_bytes < FEC_HEADER_SIZE + fcp->data_slices_per_group)
407 return -ERRNO_TO_PARA_ERROR(EINVAL);
408 fc = para_calloc(sizeof(*fc));
409 fc->fcp = fcp;
410 ret = fec_new(fcp->data_slices_per_group, fcp->slices_per_group,
411 &fc->parms);
412 if (ret < 0)
413 goto err;
414 fc->first_stream_chunk = -1; /* stream not yet started */
415 fc->src_data = para_malloc(fc->fcp->slices_per_group * sizeof(char *));
416 fc->enc_buf = para_calloc(fc->fcp->max_slice_bytes);
417 fc->num_extra_slices = 0;
418 fc->extra_src_buf = para_calloc(fc->fcp->max_slice_bytes);
419 fc->next_header_time.tv_sec = 0;
420 para_list_add(&fc->node, &fec_client_list);
421 *result = fc;
422 return 1;
423 err:
424 fec_free(fc->parms);
425 free(fc);
426 *result = NULL;
427 return ret;
428 }
429
430 /**
431 * Remove one entry from the list of active fec clients.
432 *
433 * \param fc The client to be removed.
434 */
435 void vss_del_fec_client(struct fec_client *fc)
436 {
437 list_del(&fc->node);
438 free(fc->src_data);
439 free(fc->enc_buf);
440 free(fc->extra_src_buf);
441 fec_free(fc->parms);
442 free(fc);
443 }
444
445 /*
446 * Compute if/when next slice is due. If it isn't due yet and \a diff is
447 * not \p Null, compute the time difference next - now, where
448 *
449 * next = stream_start + (first_group_chunk - first_stream_chunk)
450 * * chunk_time + slice_num * slice_time
451 */
452 static int next_slice_is_due(struct fec_client *fc, struct timeval *diff)
453 {
454 struct timeval tmp, next;
455 int ret;
456
457 if (fc->first_stream_chunk < 0)
458 return 1;
459 tv_scale(fc->current_slice_num, &fc->group.slice_duration, &tmp);
460 tv_add(&tmp, &fc->group.start, &next);
461 ret = tv_diff(&next, now, diff);
462 return ret < 0? 1 : 0;
463 }
464
465 static void compute_slice_timeout(struct timeval *timeout)
466 {
467 struct fec_client *fc;
468
469 assert(vss_playing());
470 list_for_each_entry(fc, &fec_client_list, node) {
471 struct timeval diff;
472
473 if (fc->error < 0)
474 continue;
475 if (next_slice_is_due(fc, &diff)) {
476 timeout->tv_sec = 0;
477 timeout->tv_usec = 0;
478 return;
479 }
480 /* timeout = min(timeout, diff) */
481 if (tv_diff(&diff, timeout, NULL) < 0)
482 *timeout = diff;
483 }
484 }
485
486 static void set_eof_barrier(struct vss_task *vsst)
487 {
488 struct fec_client *fc;
489 struct timeval timeout = {1, 0}, *chunk_tv = vss_chunk_time();
490
491 if (!chunk_tv)
492 goto out;
493 list_for_each_entry(fc, &fec_client_list, node) {
494 struct timeval group_duration;
495
496 if (fc->error < 0)
497 continue;
498 tv_scale(fc->group.num_chunks, chunk_tv, &group_duration);
499 if (tv_diff(&timeout, &group_duration, NULL) < 0)
500 timeout = group_duration;
501 }
502 out:
503 tv_add(now, &timeout, &vsst->eof_barrier);
504 }
505
506 /**
507 * Check if vss status flag \a P (playing) is set.
508 *
509 * \return Greater than zero if playing, zero otherwise.
510 *
511 */
512 unsigned int vss_playing(void)
513 {
514 return mmd->new_vss_status_flags & VSS_PLAYING;
515 }
516
517 /**
518 * Check if the \a N (next) status flag is set.
519 *
520 * \return Greater than zero if set, zero if not.
521 *
522 */
523 unsigned int vss_next(void)
524 {
525 return mmd->new_vss_status_flags & VSS_NEXT;
526 }
527
528 /**
529 * Check if a reposition request is pending.
530 *
531 * \return Greater than zero if true, zero otherwise.
532 *
533 */
534 unsigned int vss_repos(void)
535 {
536 return mmd->new_vss_status_flags & VSS_REPOS;
537 }
538
539 /**
540 * Check if the vss is currently paused.
541 *
542 * \return Greater than zero if paused, zero otherwise.
543 *
544 */
545 unsigned int vss_paused(void)
546 {
547 return !(mmd->new_vss_status_flags & VSS_NEXT)
548 && !(mmd->new_vss_status_flags & VSS_PLAYING);
549 }
550
551 /**
552 * Check if the vss is currently stopped.
553 *
554 * \return Greater than zero if paused, zero otherwise.
555 *
556 */
557 unsigned int vss_stopped(void)
558 {
559 return (mmd->new_vss_status_flags & VSS_NEXT)
560 && !(mmd->new_vss_status_flags & VSS_PLAYING);
561 }
562
563 static int chk_barrier(const char *bname, const struct timeval *barrier,
564 struct timeval *diff, int print_log)
565 {
566 long ms;
567
568 if (tv_diff(now, barrier, diff) > 0)
569 return 1;
570 ms = tv2ms(diff);
571 if (print_log && ms)
572 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
573 return -1;
574 }
575
576 /*
577 * != NULL: timeout for next chunk
578 * NULL: nothing to do
579 */
580 static struct timeval *vss_compute_timeout(struct vss_task *vsst)
581 {
582 static struct timeval the_timeout;
583 struct timeval next_chunk;
584
585 if (vss_next() && vsst->map) {
586 /* only sleep a bit, nec*/
587 the_timeout.tv_sec = 0;
588 the_timeout.tv_usec = 100;
589 return &the_timeout;
590 }
591 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
592 &the_timeout, 1) < 0)
593 return &the_timeout;
594 if (chk_barrier("eof", &vsst->eof_barrier, &the_timeout, 1) < 0)
595 return &the_timeout;
596 if (chk_barrier("data send", &vsst->data_send_barrier,
597 &the_timeout, 1) < 0)
598 return &the_timeout;
599 if (!vss_playing() || !vsst->map)
600 return NULL;
601 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
602 &mmd->stream_start, &next_chunk);
603 if (chk_barrier("chunk", &next_chunk, &the_timeout, 0) >= 0) {
604 /* chunk is due or bof */
605 the_timeout.tv_sec = 0;
606 the_timeout.tv_usec = 0;
607 return &the_timeout;
608 }
609 /* compute min of current timeout and next slice time */
610 compute_slice_timeout(&the_timeout);
611 return &the_timeout;
612 }
613
614 static void vss_eof(struct vss_task *vsst)
615 {
616
617 if (!vsst->map)
618 return;
619 if (mmd->new_vss_status_flags & VSS_NOMORE)
620 mmd->new_vss_status_flags = VSS_NEXT;
621 set_eof_barrier(vsst);
622 para_munmap(vsst->map, mmd->size);
623 vsst->map = NULL;
624 mmd->chunks_sent = 0;
625 mmd->offset = 0;
626 mmd->afd.afhi.seconds_total = 0;
627 mmd->afd.afhi.chunk_tv.tv_sec = 0;
628 mmd->afd.afhi.chunk_tv.tv_usec = 0;
629 free(mmd->afd.afhi.chunk_table);
630 mmd->afd.afhi.chunk_table = NULL;
631 mmd->mtime = 0;
632 mmd->size = 0;
633 mmd->events++;
634 }
635
636 /**
637 * Get the list of all supported audio formats.
638 *
639 * \return Aa space separated list of all supported audio formats
640 * It is not allocated at runtime, i.e. there is no need to free
641 * the returned string in the caller.
642 */
643 const char *supported_audio_formats(void)
644 {
645 return SUPPORTED_AUDIO_FORMATS;
646 }
647
648 static int need_to_request_new_audio_file(struct vss_task *vsst)
649 {
650 struct timeval diff;
651
652 if (vsst->map) /* have audio file */
653 return 0;
654 if (!vss_playing()) /* don't need one */
655 return 0;
656 if (mmd->new_vss_status_flags & VSS_NOMORE)
657 return 0;
658 if (vsst->afsss == AFS_SOCKET_AFD_PENDING) /* already requested one */
659 return 0;
660 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
661 &diff, 1) < 0)
662 return 0;
663 return 1;
664 }
665
666 /**
667 * Compute the timeout for the main select-loop of the scheduler.
668 *
669 * \param s Pointer to the server scheduler.
670 * \param t Pointer to the vss task structure.
671 *
672 * Before the timeout is computed, the current vss status flags are evaluated
673 * and acted upon by calling appropriate functions from the lower layers.
674 * Possible actions include
675 *
676 * - request a new audio file from afs,
677 * - shutdown of all senders (stop/pause command),
678 * - reposition the stream (ff/jmp command).
679 */
680 static void vss_pre_select(struct sched *s, struct task *t)
681 {
682 int i;
683 struct timeval *tv, diff;
684 struct vss_task *vsst = container_of(t, struct vss_task, task);
685
686 if (!vsst->map || vss_next() || vss_paused() || vss_repos()) {
687 struct fec_client *fc, *tmp;
688 for (i = 0; senders[i].name; i++)
689 if (senders[i].shutdown_clients)
690 senders[i].shutdown_clients();
691 list_for_each_entry_safe(fc, tmp, &fec_client_list, node) {
692 fc->first_stream_chunk = -1;
693 fc->error = 0;
694 }
695 mmd->stream_start.tv_sec = 0;
696 mmd->stream_start.tv_usec = 0;
697 }
698 if (vss_next())
699 vss_eof(vsst);
700 else if (vss_paused()) {
701 if (mmd->chunks_sent)
702 set_eof_barrier(vsst);
703 mmd->chunks_sent = 0;
704 } else if (vss_repos()) {
705 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
706 set_eof_barrier(vsst);
707 mmd->chunks_sent = 0;
708 mmd->current_chunk = mmd->repos_request;
709 mmd->new_vss_status_flags &= ~VSS_REPOS;
710 }
711 if (need_to_request_new_audio_file(vsst)) {
712 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
713 para_fd_set(vsst->afs_socket, &s->wfds, &s->max_fileno);
714 vsst->afsss = AFS_SOCKET_CHECK_FOR_WRITE;
715 } else
716 para_fd_set(vsst->afs_socket, &s->rfds, &s->max_fileno);
717 for (i = 0; senders[i].name; i++) {
718 if (!senders[i].pre_select)
719 continue;
720 senders[i].pre_select(&s->max_fileno, &s->rfds, &s->wfds);
721 }
722 tv = vss_compute_timeout(vsst);
723 if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
724 s->timeout = *tv;
725 }
726
727 static int recv_afs_msg(int afs_socket, int *fd, uint32_t *code, uint32_t *data)
728 {
729 char control[255], buf[8];
730 struct msghdr msg = {.msg_iov = NULL};
731 struct cmsghdr *cmsg;
732 struct iovec iov;
733 int ret = 0;
734
735 *fd = -1;
736 iov.iov_base = buf;
737 iov.iov_len = sizeof(buf);
738 msg.msg_iov = &iov;
739 msg.msg_iovlen = 1;
740 msg.msg_control = control;
741 msg.msg_controllen = sizeof(control);
742 memset(buf, 0, sizeof(buf));
743 ret = recvmsg(afs_socket, &msg, 0);
744 if (ret < 0)
745 return -ERRNO_TO_PARA_ERROR(errno);
746 if (iov.iov_len != sizeof(buf))
747 return -E_AFS_SHORT_READ;
748 *code = *(uint32_t*)buf;
749 *data = *(uint32_t*)(buf + 4);
750 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
751 if (cmsg->cmsg_level != SOL_SOCKET
752 || cmsg->cmsg_type != SCM_RIGHTS)
753 continue;
754 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
755 continue;
756 *fd = *(int *)CMSG_DATA(cmsg);
757 }
758 return 1;
759 }
760
761 static void recv_afs_result(struct vss_task *vsst)
762 {
763 int ret, passed_fd, shmid;
764 uint32_t afs_code = 0, afs_data = 0;
765 struct stat statbuf;
766
767 vsst->afsss = AFS_SOCKET_READY;
768 ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
769 if (ret < 0)
770 goto err;
771 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
772 afs_data);
773 ret = -E_NOFD;
774 if (afs_code != NEXT_AUDIO_FILE)
775 goto err;
776 if (passed_fd < 0)
777 goto err;
778 shmid = afs_data;
779 ret = load_afd(shmid, &mmd->afd);
780 if (ret < 0)
781 goto err;
782 shm_destroy(shmid);
783 ret = fstat(passed_fd, &statbuf);
784 if (ret < 0) {
785 PARA_ERROR_LOG("fstat error:\n");
786 ret = -ERRNO_TO_PARA_ERROR(errno);
787 goto err;
788 }
789 mmd->size = statbuf.st_size;
790 mmd->mtime = statbuf.st_mtime;
791 ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
792 0, &vsst->map);
793 if (ret < 0)
794 goto err;
795 close(passed_fd);
796 mmd->chunks_sent = 0;
797 mmd->current_chunk = 0;
798 mmd->offset = 0;
799 mmd->events++;
800 mmd->num_played++;
801 mmd->new_vss_status_flags &= (~VSS_NEXT);
802 afh_get_header(&mmd->afd.afhi, vsst->map, &vsst->header_buf,
803 &vsst->header_len);
804 return;
805 err:
806 free(mmd->afd.afhi.chunk_table);
807 if (passed_fd >= 0)
808 close(passed_fd);
809 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
810 mmd->new_vss_status_flags = VSS_NEXT;
811 }
812
813 /**
814 * Main sending function.
815 *
816 * This function gets called from vss_post_select(). It checks whether the next
817 * chunk of data should be pushed out. It obtains a pointer to the data to be
818 * sent out as well as its length from mmd->afd.afhi. This information is then
819 * passed to each supported sender's send() function as well as to the send()
820 * functions of each registered fec client.
821 */
822 static void vss_send(struct vss_task *vsst)
823 {
824 int i, sent_something = 0;
825 struct timeval due;
826 struct fec_client *fc, *tmp_fc;
827
828 if (!vsst->map || !vss_playing())
829 return;
830 if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
831 return;
832 if (chk_barrier("data send", &vsst->data_send_barrier,
833 &due, 1) < 0)
834 return;
835 list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
836 if (fc->error < 0)
837 continue;
838 if (!next_slice_is_due(fc, NULL))
839 continue;
840 if (compute_next_fec_slice(fc, vsst) <= 0)
841 continue;
842 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc->group.num,
843 fc->current_slice_num, fc->fcp->max_slice_bytes);
844 fc->fcp->send((char *)fc->enc_buf,
845 fc->fcp->max_slice_bytes,
846 fc->fcp->private_data);
847 fc->current_slice_num++;
848 sent_something = 1;
849 }
850 if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
851 if (!sent_something)
852 mmd->new_vss_status_flags |= VSS_NEXT;
853 return;
854 }
855 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
856 &mmd->stream_start, &due);
857 if (tv_diff(&due, now, NULL) <= 0) {
858 const char *buf;
859 size_t len;
860
861 if (!mmd->chunks_sent) {
862 struct timeval tmp;
863 mmd->stream_start = *now;
864 tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &tmp);
865 mmd->offset = tv2ms(&tmp);
866 mmd->events++;
867 }
868 /*
869 * We call the send function also in case of empty chunks as
870 * they might have still some data queued which can be sent in
871 * this case.
872 */
873 afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
874 &buf, &len);
875 for (i = 0; senders[i].name; i++) {
876 if (!senders[i].send)
877 continue;
878 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
879 buf, len, vsst->header_buf, vsst->header_len);
880 }
881 mmd->chunks_sent++;
882 mmd->current_chunk++;
883 }
884 }
885
886 static void vss_post_select(struct sched *s, struct task *t)
887 {
888 int ret, i;
889 struct vss_task *vsst = container_of(t, struct vss_task, task);
890
891
892 if (mmd->sender_cmd_data.cmd_num >= 0) {
893 int num = mmd->sender_cmd_data.cmd_num,
894 sender_num = mmd->sender_cmd_data.sender_num;
895
896 if (senders[sender_num].client_cmds[num])
897 senders[sender_num].client_cmds[num](&mmd->sender_cmd_data);
898 mmd->sender_cmd_data.cmd_num = -1;
899 }
900 if (vsst->afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
901 if (FD_ISSET(vsst->afs_socket, &s->rfds))
902 recv_afs_result(vsst);
903 } else if (FD_ISSET(vsst->afs_socket, &s->wfds)) {
904 PARA_NOTICE_LOG("requesting new fd from afs\n");
905 ret = send_buffer(vsst->afs_socket, "new");
906 if (ret < 0)
907 PARA_CRIT_LOG("%s\n", para_strerror(-ret));
908 else
909 vsst->afsss = AFS_SOCKET_AFD_PENDING;
910 }
911 for (i = 0; senders[i].name; i++) {
912 if (!senders[i].post_select)
913 continue;
914 senders[i].post_select(&s->rfds, &s->wfds);
915 }
916 if ((vss_playing() && !(mmd->vss_status_flags & VSS_PLAYING)) ||
917 (vss_next() && vss_playing()))
918 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
919 vss_send(vsst);
920 }
921
922 /**
923 * Initialize the virtual streaming system task.
924 *
925 * \param afs_socket The fd for communication with afs.
926 *
927 * This also initializes all supported senders and starts streaming
928 * if the --autoplay command line flag was given.
929 */
930 void init_vss_task(int afs_socket)
931 {
932 static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
933 int i;
934 char *hn = para_hostname(), *home = para_homedir();
935 long unsigned announce_time = conf.announce_time_arg > 0?
936 conf.announce_time_arg : 300,
937 autoplay_delay = conf.autoplay_delay_arg > 0?
938 conf.autoplay_delay_arg : 0;
939 vsst->header_interval.tv_sec = 5; /* should this be configurable? */
940 vsst->afs_socket = afs_socket;
941 vsst->task.pre_select = vss_pre_select;
942 vsst->task.post_select = vss_post_select;
943 ms2tv(announce_time, &vsst->announce_tv);
944 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst->announce_tv));
945 INIT_LIST_HEAD(&fec_client_list);
946 for (i = 0; senders[i].name; i++) {
947 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
948 senders[i].init(&senders[i]);
949 }
950 free(hn);
951 free(home);
952 mmd->sender_cmd_data.cmd_num = -1;
953 if (conf.autoplay_given) {
954 struct timeval tmp;
955 mmd->vss_status_flags |= VSS_PLAYING;
956 mmd->new_vss_status_flags |= VSS_PLAYING;
957 ms2tv(autoplay_delay, &tmp);
958 tv_add(now, &tmp, &vsst->autoplay_barrier);
959 tv_add(&vsst->autoplay_barrier, &vsst->announce_tv,
960 &vsst->data_send_barrier);
961 }
962 register_task(&vsst->task);
963 }