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