da8510ee7b1dcf8babee2234bd29c851fd9babd8
[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 #include <osl.h>
16
17 #include "para.h"
18 #include "error.h"
19 #include "portable_io.h"
20 #include "fec.h"
21 #include "string.h"
22 #include "afh.h"
23 #include "afs.h"
24 #include "server.h"
25 #include "net.h"
26 #include "server.cmdline.h"
27 #include "list.h"
28 #include "vss.h"
29 #include "send.h"
30 #include "ipc.h"
31 #include "fd.h"
32 #include "sched.h"
33
34 extern struct misc_meta_data *mmd;
35
36 extern void dccp_send_init(struct sender *);
37 extern void http_send_init(struct sender *);
38 extern void udp_send_init(struct sender *);
39
40 /** The list of supported senders. */
41 struct sender senders[] = {
42 {
43 .name = "http",
44 .init = http_send_init,
45 },
46 {
47 .name = "dccp",
48 .init = dccp_send_init,
49 },
50 {
51 .name = "udp",
52 .init = udp_send_init,
53 },
54 {
55 .name = NULL,
56 }
57 };
58
59 /** The possible states of the afs socket. */
60 enum afs_socket_status {
61 /** Socket is inactive. */
62 AFS_SOCKET_READY,
63 /** Socket fd was included in the write fd set for select(). */
64 AFS_SOCKET_CHECK_FOR_WRITE,
65 /** vss wrote a request to the socket and waits for reply from afs. */
66 AFS_SOCKET_AFD_PENDING
67 };
68
69 /** The task structure for the virtual streaming system. */
70 struct vss_task {
71 /** Copied from the -announce_time command line option. */
72 struct timeval announce_tv;
73 /** End of the announcing interval. */
74 struct timeval data_send_barrier;
75 /** End of the EOF interval. */
76 struct timeval eof_barrier;
77 /** Only used if --autoplay_delay was given. */
78 struct timeval autoplay_barrier;
79 /** Used for afs-server communication. */
80 int afs_socket;
81 /** The current state of \a afs_socket. */
82 enum afs_socket_status afsss;
83 /** The memory mapped audio file. */
84 char *map;
85 /** Used by the scheduler. */
86 struct task task;
87 /** Pointer to the header of the mapped audio file. */
88 const char *header_buf;
89 /** Length of the audio file header. */
90 size_t header_len;
91 /** Time between audio file headers are sent. */
92 struct timeval header_interval;
93 };
94
95 /**
96 * The list of currently connected fec clients.
97 *
98 * Senders may use \ref vss_add_fec_client() to add entries to the list.
99 */
100 static struct list_head fec_client_list;
101
102 /**
103 * Data associated with one FEC group.
104 *
105 * A FEC group consists of a fixed number of slices and this number is given by
106 * the \a slices_per_group parameter of struct \ref fec_client_parms. Each FEC
107 * group contains a number of chunks of the current audio file.
108 *
109 * FEC slices directly correspond to the data packages sent by the paraslash
110 * senders that use FEC. Each slice is identified by its group number and its
111 * number within the group. All slices have the same size, but the last slice
112 * of the group may not be filled entirely.
113 */
114 struct fec_group {
115 /** The number of the FEC group. */
116 uint32_t num;
117 /** Number of bytes in this group. */
118 uint32_t bytes;
119 /** The first chunk of the current audio file belonging to the group. */
120 uint32_t first_chunk;
121 /** The number of chunks contained in this group. */
122 uint32_t num_chunks;
123 /** When the first chunk was sent. */
124 struct timeval start;
125 /** The group duration divided by the number of slices. */
126 struct timeval slice_duration;
127 /** Group contains the audio file header that occupies that many slices. */
128 uint8_t num_header_slices;
129 };
130
131 /**
132 * Describes one connected FEC client.
133 */
134 struct fec_client {
135 /** If negative, this client is temporarily disabled. */
136 int error;
137 /** Parameters requested by the client. */
138 struct fec_client_parms *fcp;
139 /** Used by the core FEC code. */
140 struct fec_parms *parms;
141 /** The position of this client in the fec client list. */
142 struct list_head node;
143 /** When the first slice for this client was sent. */
144 struct timeval stream_start;
145 /** The first chunk sent to this FEC client. */
146 int first_stream_chunk;
147 /** Describes the current group. */
148 struct fec_group group;
149 /** The current slice. */
150 uint8_t current_slice_num;
151 /** The data to be FEC-encoded (point to a region within the mapped audio file). */
152 const unsigned char **src_data;
153 /** Last time an audio header was sent. */
154 struct timeval next_header_time;
155 /** Used for the last source pointer of an audio file. */
156 unsigned char *extra_src_buf;
157 /** Extra slices needed to store largest chunk + header. */
158 int num_extra_slices;
159 /** Contains the FEC-encoded data. */
160 unsigned char *enc_buf;
161 };
162
163 /**
164 * Get the chunk time of the current audio file.
165 *
166 * \return A pointer to a struct containing the chunk time, or NULL,
167 * if currently no audio file is selected.
168 */
169 struct timeval *vss_chunk_time(void)
170 {
171 if (mmd->afd.afhi.chunk_tv.tv_sec == 0 &&
172 mmd->afd.afhi.chunk_tv.tv_usec == 0)
173 return NULL;
174 return &mmd->afd.afhi.chunk_tv;
175 }
176
177 /**
178 * Write a fec header to a buffer.
179 *
180 * \param buf The buffer to write to.
181 * \param h The fec header to write.
182 */
183 static void write_fec_header(struct fec_client *fc, struct vss_task *vsst)
184 {
185 char *buf = (char *)fc->enc_buf;
186 struct fec_group *g = &fc->group;
187 struct fec_client_parms *p = fc->fcp;
188
189 write_u32(buf, FEC_MAGIC);
190
191 write_u8(buf + 4, p->slices_per_group + fc->num_extra_slices);
192 write_u8(buf + 5, p->data_slices_per_group + fc->num_extra_slices);
193 write_u32(buf + 6, g->num_header_slices? vsst->header_len : 0);
194
195 write_u32(buf + 10, g->num);
196 write_u32(buf + 14, g->bytes);
197
198 write_u8(buf + 18, fc->current_slice_num);
199 write_u16(buf + 20, p->max_slice_bytes - FEC_HEADER_SIZE);
200 write_u8(buf + 22, g->first_chunk? 0 : 1);
201 write_u8(buf + 23, vsst->header_len? 1 : 0);
202 memset(buf + 24, 0, 7);
203 }
204
205 static int need_audio_header(struct fec_client *fc, struct vss_task *vsst)
206 {
207 if (!mmd->current_chunk) {
208 tv_add(now, &vsst->header_interval, &fc->next_header_time);
209 return 0;
210 }
211 if (!vsst->header_buf)
212 return 0;
213 if (!vsst->header_len)
214 return 0;
215 if (fc->group.num && tv_diff(&fc->next_header_time, now, NULL) > 0)
216 return 0;
217 tv_add(now, &vsst->header_interval, &fc->next_header_time);
218 return 1;
219 }
220
221 static int num_slices(long unsigned bytes, struct fec_client *fc, uint8_t *result)
222 {
223 unsigned long m = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
224 unsigned rv, redundant_slices = fc->fcp->slices_per_group
225 - fc->fcp->data_slices_per_group;
226
227 if (!m)
228 return -E_BAD_CT;
229 rv = (bytes + m - 1) / m;
230 if (rv + redundant_slices > 255)
231 return -E_BAD_CT;
232 *result = rv;
233 return 1;
234 }
235
236 static int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
237 {
238 int ret, i, k, data_slices;
239 size_t len;
240 const char *buf, *start_buf;
241 struct timeval tmp, *chunk_tv = vss_chunk_time();
242 struct fec_group *g = &fc->group;
243 unsigned slice_bytes = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
244 uint32_t max_data_size;
245
246 assert(chunk_tv);
247 k = fc->fcp->data_slices_per_group + fc->num_extra_slices;
248 if (fc->first_stream_chunk < 0) {
249 uint32_t largest = afh_get_largest_chunk_size(&mmd->afd.afhi)
250 + vsst->header_len;
251 uint8_t needed, want;
252
253 ret = num_slices(largest, fc, &needed);
254 if (ret < 0)
255 return ret;
256 if (needed > fc->fcp->data_slices_per_group)
257 PARA_WARNING_LOG("fec parms insufficient for this audio file\n");
258 want = PARA_MAX(needed, fc->fcp->data_slices_per_group);
259 if (want != k) {
260 fec_free(fc->parms);
261 fc->src_data = para_realloc(fc->src_data, want * sizeof(char *));
262 ret = fec_new(want, want + fc->fcp->slices_per_group
263 - fc->fcp->data_slices_per_group, &fc->parms);
264 if (ret < 0)
265 return ret;
266 k = want;
267 fc->num_extra_slices = 0;
268 if (k > fc->fcp->data_slices_per_group) {
269 fc->num_extra_slices = k - fc->fcp->data_slices_per_group;
270 PARA_NOTICE_LOG("using %d extra slices\n",
271 fc->num_extra_slices);
272 }
273 }
274 fc->stream_start = *now;
275 fc->first_stream_chunk = mmd->current_chunk;
276 g->first_chunk = mmd->current_chunk;
277 g->num = 0;
278 } else {
279 g->first_chunk += g->num_chunks;
280 g->num++;
281 }
282 if (g->first_chunk >= mmd->afd.afhi.chunks_total)
283 return 0;
284 if (need_audio_header(fc, vsst)) {
285 ret = num_slices(vsst->header_len, fc, &g->num_header_slices);
286 if (ret < 0)
287 return ret;
288 } else
289 g->num_header_slices = 0;
290 afh_get_chunk(g->first_chunk, &mmd->afd.afhi, vsst->map, &start_buf,
291 &len);
292 data_slices = k - g->num_header_slices;
293 assert(data_slices);
294 max_data_size = slice_bytes * data_slices;
295 g->bytes = 0;
296 for (i = g->first_chunk; i < mmd->afd.afhi.chunks_total; i++) {
297 afh_get_chunk(i, &mmd->afd.afhi, vsst->map, &buf, &len);
298 if (g->bytes + len > max_data_size)
299 break;
300 g->bytes += len;
301 }
302 g->num_chunks = i - g->first_chunk;
303 assert(g->num_chunks);
304 fc->current_slice_num = 0;
305
306 /* setup header slices */
307 buf = vsst->header_buf;
308 for (i = 0; i < g->num_header_slices; i++) {
309 fc->src_data[i] = (const unsigned char *)buf;
310 buf += slice_bytes;
311 }
312
313 /* setup data slices */
314 buf = start_buf;
315 for (i = g->num_header_slices; i < k; i++) {
316 if (buf + slice_bytes > vsst->map + mmd->size)
317 /*
318 * Can not use the memory mapped audio file for this
319 * slice as it goes beyond the map. This slice will not
320 * be fully used.
321 */
322 break;
323 fc->src_data[i] = (const unsigned char *)buf;
324 buf += slice_bytes;
325 }
326 if (i < k) {
327 uint32_t payload_size = vsst->map + mmd->size - buf;
328 memcpy(fc->extra_src_buf, buf, payload_size);
329 fc->src_data[i] = fc->extra_src_buf;
330 i++;
331 /* use arbitrary data for all remaining slices */
332 buf = vsst->map;
333 for (; i < k; i++)
334 fc->src_data[i] = (const unsigned char *)buf;
335 }
336
337 /* setup group timing */
338 tv_scale(g->first_chunk - fc->first_stream_chunk, chunk_tv, &tmp);
339 tv_add(&fc->stream_start, &tmp, &g->start);
340 if (g->num) /* quick hack to avoid buffer underruns */
341 g->start.tv_sec--;
342 tv_scale(g->num_chunks, chunk_tv, &tmp); /* group duration */
343 tv_divide(fc->fcp->slices_per_group + fc->num_extra_slices,
344 &tmp, &g->slice_duration);
345
346 PARA_DEBUG_LOG("FEC group %d: %d chunks (%d - %d), %d header slices, %d data slices\n",
347 g->num, g->num_chunks, g->first_chunk,
348 g->first_chunk + g->num_chunks - 1,
349 g->num_header_slices, data_slices
350 );
351 PARA_DEBUG_LOG("durations (group/chunk/slice): %lu/%lu/%lu\n",
352 tv2ms(&tmp), tv2ms(chunk_tv), tv2ms(&g->slice_duration));
353 return 1;
354 }
355
356 static int compute_next_fec_slice(struct fec_client *fc, struct vss_task *vsst)
357 {
358 assert(fc->error >= 0);
359 if (fc->first_stream_chunk < 0 || fc->current_slice_num
360 == fc->fcp->slices_per_group + fc->num_extra_slices) {
361 int ret = setup_next_fec_group(fc, vsst);
362 if (ret == 0)
363 return 0;
364 if (ret < 0) {
365 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
366 PARA_ERROR_LOG("FEC client temporarily disabled\n");
367 fc->error = ret;
368 return fc->error;
369 }
370 }
371 write_fec_header(fc, vsst);
372 fec_encode(fc->parms, fc->src_data, fc->enc_buf + FEC_HEADER_SIZE,
373 fc->current_slice_num,
374 fc->fcp->max_slice_bytes - FEC_HEADER_SIZE);
375 return 1;
376 }
377
378 /**
379 * Return a buffer that marks the end of the stream.
380 *
381 * \param buf Result pointer.
382 * \return The length of the eof buffer.
383 *
384 * This is used for (multicast) udp streaming where closing the socket on the
385 * sender might not give rise to an eof condition at the peer.
386 */
387 size_t vss_get_fec_eof_packet(const char **buf)
388 {
389 static const char fec_eof_packet[FEC_HEADER_SIZE] = FEC_EOF_PACKET;
390 *buf = fec_eof_packet;
391 return FEC_HEADER_SIZE;
392 }
393
394 /**
395 * Add one entry to the list of active fec clients.
396 *
397 * \param fcp Describes the fec parameters to be used for this client.
398 * \param result An opaque pointer that must be used by remove the client later.
399 *
400 * \return Standard.
401 */
402 int vss_add_fec_client(struct fec_client_parms *fcp, struct fec_client **result)
403 {
404 int ret;
405 struct fec_client *fc;
406
407 if (fcp->max_slice_bytes < FEC_HEADER_SIZE + fcp->data_slices_per_group)
408 return -ERRNO_TO_PARA_ERROR(EINVAL);
409 fc = para_calloc(sizeof(*fc));
410 fc->fcp = fcp;
411 ret = fec_new(fcp->data_slices_per_group, fcp->slices_per_group,
412 &fc->parms);
413 if (ret < 0)
414 goto err;
415 fc->first_stream_chunk = -1; /* stream not yet started */
416 fc->src_data = para_malloc(fc->fcp->slices_per_group * sizeof(char *));
417 fc->enc_buf = para_calloc(fc->fcp->max_slice_bytes);
418 fc->num_extra_slices = 0;
419 fc->extra_src_buf = para_calloc(fc->fcp->max_slice_bytes);
420 fc->next_header_time.tv_sec = 0;
421 para_list_add(&fc->node, &fec_client_list);
422 *result = fc;
423 return 1;
424 err:
425 fec_free(fc->parms);
426 free(fc);
427 *result = NULL;
428 return ret;
429 }
430
431 /**
432 * Remove one entry from the list of active fec clients.
433 *
434 * \param fc The client to be removed.
435 */
436 void vss_del_fec_client(struct fec_client *fc)
437 {
438 list_del(&fc->node);
439 free(fc->src_data);
440 free(fc->enc_buf);
441 free(fc->extra_src_buf);
442 fec_free(fc->parms);
443 free(fc);
444 }
445
446 /*
447 * Compute if/when next slice is due. If it isn't due yet and \a diff is
448 * not \p Null, compute the time difference next - now, where
449 *
450 * next = stream_start + (first_group_chunk - first_stream_chunk)
451 * * chunk_time + slice_num * slice_time
452 */
453 static int next_slice_is_due(struct fec_client *fc, struct timeval *diff)
454 {
455 struct timeval tmp, next;
456 int ret;
457
458 if (fc->first_stream_chunk < 0)
459 return 1;
460 tv_scale(fc->current_slice_num, &fc->group.slice_duration, &tmp);
461 tv_add(&tmp, &fc->group.start, &next);
462 ret = tv_diff(&next, now, diff);
463 return ret < 0? 1 : 0;
464 }
465
466 static void compute_slice_timeout(struct timeval *timeout)
467 {
468 struct fec_client *fc;
469
470 assert(vss_playing());
471 list_for_each_entry(fc, &fec_client_list, node) {
472 struct timeval diff;
473
474 if (fc->error < 0)
475 continue;
476 if (next_slice_is_due(fc, &diff)) {
477 timeout->tv_sec = 0;
478 timeout->tv_usec = 0;
479 return;
480 }
481 /* timeout = min(timeout, diff) */
482 if (tv_diff(&diff, timeout, NULL) < 0)
483 *timeout = diff;
484 }
485 }
486
487 static void set_eof_barrier(struct vss_task *vsst)
488 {
489 struct fec_client *fc;
490 struct timeval timeout = mmd->afd.afhi.eof_tv,
491 *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 free(mmd->afd.afhi.info_string);
634 mmd->afd.afhi.info_string = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_FILE_INFO],
635 status_item_list[SI_TAGINFO1], status_item_list[SI_TAGINFO2]);
636 make_empty_status_items(mmd->afd.verbose_ls_output);
637 mmd->mtime = 0;
638 mmd->size = 0;
639 mmd->events++;
640 }
641
642 /**
643 * Get the list of all supported audio formats.
644 *
645 * \return Aa space separated list of all supported audio formats
646 * It is not allocated at runtime, i.e. there is no need to free
647 * the returned string in the caller.
648 */
649 const char *supported_audio_formats(void)
650 {
651 return SUPPORTED_AUDIO_FORMATS;
652 }
653
654 static int need_to_request_new_audio_file(struct vss_task *vsst)
655 {
656 struct timeval diff;
657
658 if (vsst->map) /* have audio file */
659 return 0;
660 if (!vss_playing()) /* don't need one */
661 return 0;
662 if (mmd->new_vss_status_flags & VSS_NOMORE)
663 return 0;
664 if (vsst->afsss == AFS_SOCKET_AFD_PENDING) /* already requested one */
665 return 0;
666 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
667 &diff, 1) < 0)
668 return 0;
669 return 1;
670 }
671
672 /**
673 * Compute the timeout for the main select-loop of the scheduler.
674 *
675 * \param s Pointer to the server scheduler.
676 * \param t Pointer to the vss task structure.
677 *
678 * Before the timeout is computed, the current vss status flags are evaluated
679 * and acted upon by calling appropriate functions from the lower layers.
680 * Possible actions include
681 *
682 * - request a new audio file from afs,
683 * - shutdown of all senders (stop/pause command),
684 * - reposition the stream (ff/jmp command).
685 */
686 static void vss_pre_select(struct sched *s, struct task *t)
687 {
688 int i;
689 struct timeval *tv, diff;
690 struct vss_task *vsst = container_of(t, struct vss_task, task);
691
692 if (!vsst->map || vss_next() || vss_paused() || vss_repos()) {
693 struct fec_client *fc, *tmp;
694 for (i = 0; senders[i].name; i++)
695 if (senders[i].shutdown_clients)
696 senders[i].shutdown_clients();
697 list_for_each_entry_safe(fc, tmp, &fec_client_list, node) {
698 fc->first_stream_chunk = -1;
699 fc->error = 0;
700 }
701 mmd->stream_start.tv_sec = 0;
702 mmd->stream_start.tv_usec = 0;
703 }
704 if (vss_next())
705 vss_eof(vsst);
706 else if (vss_paused()) {
707 if (mmd->chunks_sent)
708 set_eof_barrier(vsst);
709 mmd->chunks_sent = 0;
710 } else if (vss_repos()) {
711 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
712 set_eof_barrier(vsst);
713 mmd->chunks_sent = 0;
714 mmd->current_chunk = mmd->repos_request;
715 mmd->new_vss_status_flags &= ~VSS_REPOS;
716 }
717 if (need_to_request_new_audio_file(vsst)) {
718 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
719 para_fd_set(vsst->afs_socket, &s->wfds, &s->max_fileno);
720 vsst->afsss = AFS_SOCKET_CHECK_FOR_WRITE;
721 } else
722 para_fd_set(vsst->afs_socket, &s->rfds, &s->max_fileno);
723 for (i = 0; senders[i].name; i++) {
724 if (!senders[i].pre_select)
725 continue;
726 senders[i].pre_select(&s->max_fileno, &s->rfds, &s->wfds);
727 }
728 tv = vss_compute_timeout(vsst);
729 if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
730 s->timeout = *tv;
731 }
732
733 static int recv_afs_msg(int afs_socket, int *fd, uint32_t *code, uint32_t *data)
734 {
735 char control[255], buf[8];
736 struct msghdr msg = {.msg_iov = NULL};
737 struct cmsghdr *cmsg;
738 struct iovec iov;
739 int ret = 0;
740
741 *fd = -1;
742 iov.iov_base = buf;
743 iov.iov_len = sizeof(buf);
744 msg.msg_iov = &iov;
745 msg.msg_iovlen = 1;
746 msg.msg_control = control;
747 msg.msg_controllen = sizeof(control);
748 memset(buf, 0, sizeof(buf));
749 ret = recvmsg(afs_socket, &msg, 0);
750 if (ret < 0)
751 return -ERRNO_TO_PARA_ERROR(errno);
752 if (iov.iov_len != sizeof(buf))
753 return -E_AFS_SHORT_READ;
754 *code = *(uint32_t*)buf;
755 *data = *(uint32_t*)(buf + 4);
756 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
757 if (cmsg->cmsg_level != SOL_SOCKET
758 || cmsg->cmsg_type != SCM_RIGHTS)
759 continue;
760 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
761 continue;
762 *fd = *(int *)CMSG_DATA(cmsg);
763 }
764 return 1;
765 }
766
767 static void recv_afs_result(struct vss_task *vsst)
768 {
769 int ret, passed_fd, shmid;
770 uint32_t afs_code = 0, afs_data = 0;
771 struct stat statbuf;
772
773 vsst->afsss = AFS_SOCKET_READY;
774 ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
775 if (ret < 0)
776 goto err;
777 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
778 afs_data);
779 ret = -E_NOFD;
780 if (afs_code != NEXT_AUDIO_FILE)
781 goto err;
782 if (passed_fd < 0)
783 goto err;
784 shmid = afs_data;
785 free(mmd->afd.afhi.info_string);
786 ret = load_afd(shmid, &mmd->afd);
787 if (ret < 0)
788 goto err;
789 shm_destroy(shmid);
790 ret = fstat(passed_fd, &statbuf);
791 if (ret < 0) {
792 PARA_ERROR_LOG("fstat error:\n");
793 ret = -ERRNO_TO_PARA_ERROR(errno);
794 goto err;
795 }
796 mmd->size = statbuf.st_size;
797 mmd->mtime = statbuf.st_mtime;
798 ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
799 0, &vsst->map);
800 if (ret < 0)
801 goto err;
802 close(passed_fd);
803 mmd->chunks_sent = 0;
804 mmd->current_chunk = 0;
805 mmd->offset = 0;
806 mmd->events++;
807 mmd->num_played++;
808 mmd->new_vss_status_flags &= (~VSS_NEXT);
809 afh_get_header(&mmd->afd.afhi, vsst->map, &vsst->header_buf,
810 &vsst->header_len);
811 return;
812 err:
813 free(mmd->afd.afhi.chunk_table);
814 if (passed_fd >= 0)
815 close(passed_fd);
816 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
817 mmd->new_vss_status_flags = VSS_NEXT;
818 }
819
820 /**
821 * Main sending function.
822 *
823 * This function gets called from vss_post_select(). It checks whether the next
824 * chunk of data should be pushed out. It obtains a pointer to the data to be
825 * sent out as well as its length from mmd->afd.afhi. This information is then
826 * passed to each supported sender's send() function as well as to the send()
827 * functions of each registered fec client.
828 */
829 static void vss_send(struct vss_task *vsst)
830 {
831 int i, sent_something = 0;
832 struct timeval due;
833 struct fec_client *fc, *tmp_fc;
834
835 if (!vsst->map || !vss_playing())
836 return;
837 if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
838 return;
839 if (chk_barrier("data send", &vsst->data_send_barrier,
840 &due, 1) < 0)
841 return;
842 list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
843 if (fc->error < 0)
844 continue;
845 if (!next_slice_is_due(fc, NULL))
846 continue;
847 if (compute_next_fec_slice(fc, vsst) <= 0)
848 continue;
849 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc->group.num,
850 fc->current_slice_num, fc->fcp->max_slice_bytes);
851 fc->fcp->send((char *)fc->enc_buf,
852 fc->fcp->max_slice_bytes,
853 fc->fcp->private_data);
854 fc->current_slice_num++;
855 sent_something = 1;
856 }
857 if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
858 if (!sent_something)
859 mmd->new_vss_status_flags |= VSS_NEXT;
860 return;
861 }
862 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
863 &mmd->stream_start, &due);
864 if (tv_diff(&due, now, NULL) <= 0) {
865 const char *buf;
866 size_t len;
867
868 if (!mmd->chunks_sent) {
869 struct timeval tmp;
870 mmd->stream_start = *now;
871 tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &tmp);
872 mmd->offset = tv2ms(&tmp);
873 mmd->events++;
874 }
875 /*
876 * We call the send function also in case of empty chunks as
877 * they might have still some data queued which can be sent in
878 * this case.
879 */
880 afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
881 &buf, &len);
882 for (i = 0; senders[i].name; i++) {
883 if (!senders[i].send)
884 continue;
885 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
886 buf, len, vsst->header_buf, vsst->header_len);
887 }
888 mmd->chunks_sent++;
889 mmd->current_chunk++;
890 }
891 }
892
893 static void vss_post_select(struct sched *s, struct task *t)
894 {
895 int ret, i;
896 struct vss_task *vsst = container_of(t, struct vss_task, task);
897
898
899 if (mmd->sender_cmd_data.cmd_num >= 0) {
900 int num = mmd->sender_cmd_data.cmd_num,
901 sender_num = mmd->sender_cmd_data.sender_num;
902
903 if (senders[sender_num].client_cmds[num])
904 senders[sender_num].client_cmds[num](&mmd->sender_cmd_data);
905 mmd->sender_cmd_data.cmd_num = -1;
906 }
907 if (vsst->afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
908 if (FD_ISSET(vsst->afs_socket, &s->rfds))
909 recv_afs_result(vsst);
910 } else if (FD_ISSET(vsst->afs_socket, &s->wfds)) {
911 PARA_NOTICE_LOG("requesting new fd from afs\n");
912 ret = send_buffer(vsst->afs_socket, "new");
913 if (ret < 0)
914 PARA_CRIT_LOG("%s\n", para_strerror(-ret));
915 else
916 vsst->afsss = AFS_SOCKET_AFD_PENDING;
917 }
918 for (i = 0; senders[i].name; i++) {
919 if (!senders[i].post_select)
920 continue;
921 senders[i].post_select(&s->rfds, &s->wfds);
922 }
923 if ((vss_playing() && !(mmd->vss_status_flags & VSS_PLAYING)) ||
924 (vss_next() && vss_playing()))
925 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
926 vss_send(vsst);
927 }
928
929 /**
930 * Initialize the virtual streaming system task.
931 *
932 * \param afs_socket The fd for communication with afs.
933 *
934 * This also initializes all supported senders and starts streaming
935 * if the --autoplay command line flag was given.
936 */
937 void init_vss_task(int afs_socket)
938 {
939 static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
940 int i;
941 char *hn = para_hostname(), *home = para_homedir();
942 long unsigned announce_time = conf.announce_time_arg > 0?
943 conf.announce_time_arg : 300,
944 autoplay_delay = conf.autoplay_delay_arg > 0?
945 conf.autoplay_delay_arg : 0;
946 vsst->header_interval.tv_sec = 5; /* should this be configurable? */
947 vsst->afs_socket = afs_socket;
948 vsst->task.pre_select = vss_pre_select;
949 vsst->task.post_select = vss_post_select;
950 ms2tv(announce_time, &vsst->announce_tv);
951 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst->announce_tv));
952 INIT_LIST_HEAD(&fec_client_list);
953 for (i = 0; senders[i].name; i++) {
954 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
955 senders[i].init(&senders[i]);
956 }
957 free(hn);
958 free(home);
959 mmd->sender_cmd_data.cmd_num = -1;
960 make_empty_status_items(mmd->afd.verbose_ls_output);
961 if (conf.autoplay_given) {
962 struct timeval tmp;
963 mmd->vss_status_flags |= VSS_PLAYING;
964 mmd->new_vss_status_flags |= VSS_PLAYING;
965 ms2tv(autoplay_delay, &tmp);
966 tv_add(now, &tmp, &vsst->autoplay_barrier);
967 tv_add(&vsst->autoplay_barrier, &vsst->announce_tv,
968 &vsst->data_send_barrier);
969 }
970 register_task(&vsst->task);
971 }