[udp_send] Refuse to stream files with invalid chunk tables.
[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 int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
236 {
237 int ret, i, k, data_slices;
238 size_t len;
239 const char *buf, *start_buf;
240 struct timeval tmp, *chunk_tv = vss_chunk_time();
241 struct fec_group *g = &fc->group;
242 unsigned slice_bytes = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
243 uint32_t max_data_size;
244
245 assert(chunk_tv);
246 k = fc->fcp->data_slices_per_group + fc->num_extra_slices;
247 if (fc->first_stream_chunk < 0) {
248 uint32_t largest = afh_get_largest_chunk_size(&mmd->afd.afhi)
249 + vsst->header_len;
250 uint8_t needed, want;
251
252 ret = num_slices(largest, fc, &needed);
253 if (ret < 0)
254 return ret;
255 if (needed > fc->fcp->data_slices_per_group)
256 PARA_WARNING_LOG("fec parms insufficient for this audio file\n");
257 want = PARA_MAX(needed, fc->fcp->data_slices_per_group);
258 if (want != k) {
259 fec_free(fc->parms);
260 fc->src_data = para_realloc(fc->src_data, want * sizeof(char *));
261 ret = fec_new(want, want + fc->fcp->slices_per_group
262 - fc->fcp->data_slices_per_group, &fc->parms);
263 if (ret < 0)
264 return ret;
265 k = want;
266 fc->num_extra_slices = 0;
267 if (k > fc->fcp->data_slices_per_group) {
268 fc->num_extra_slices = k - fc->fcp->data_slices_per_group;
269 PARA_NOTICE_LOG("using %d extra slices\n",
270 fc->num_extra_slices);
271 }
272 }
273 fc->stream_start = *now;
274 fc->first_stream_chunk = mmd->current_chunk;
275 g->first_chunk = mmd->current_chunk;
276 g->num = 0;
277 } else {
278 g->first_chunk += g->num_chunks;
279 g->num++;
280 }
281 if (g->first_chunk >= mmd->afd.afhi.chunks_total)
282 return 0;
283 if (need_audio_header(fc, vsst)) {
284 ret = num_slices(vsst->header_len, fc, &g->num_header_slices);
285 if (ret < 0)
286 return ret;
287 } else
288 g->num_header_slices = 0;
289 afh_get_chunk(g->first_chunk, &mmd->afd.afhi, vsst->map, &start_buf,
290 &len);
291 data_slices = k - g->num_header_slices;
292 assert(data_slices);
293 max_data_size = slice_bytes * data_slices;
294 g->bytes = 0;
295 for (i = g->first_chunk; i < mmd->afd.afhi.chunks_total; i++) {
296 afh_get_chunk(i, &mmd->afd.afhi, vsst->map, &buf, &len);
297 if (g->bytes + len > max_data_size)
298 break;
299 g->bytes += len;
300 }
301 g->num_chunks = i - g->first_chunk;
302 assert(g->num_chunks);
303 fc->current_slice_num = 0;
304
305 /* setup header slices */
306 buf = vsst->header_buf;
307 for (i = 0; i < g->num_header_slices; i++) {
308 fc->src_data[i] = (const unsigned char *)buf;
309 buf += slice_bytes;
310 }
311
312 /* setup data slices */
313 buf = start_buf;
314 for (i = g->num_header_slices; i < k; i++) {
315 if (buf + slice_bytes > vsst->map + mmd->size)
316 /*
317 * Can not use the memory mapped audio file for this
318 * slice as it goes beyond the map. This slice will not
319 * be fully used.
320 */
321 break;
322 fc->src_data[i] = (const unsigned char *)buf;
323 buf += slice_bytes;
324 }
325 if (i < k) {
326 uint32_t payload_size = vsst->map + mmd->size - buf;
327 memcpy(fc->extra_src_buf, buf, payload_size);
328 fc->src_data[i] = fc->extra_src_buf;
329 i++;
330 /* use arbitrary data for all remaining slices */
331 buf = vsst->map;
332 for (; i < k; i++)
333 fc->src_data[i] = (const unsigned char *)buf;
334 }
335
336 /* setup group timing */
337 tv_scale(g->first_chunk - fc->first_stream_chunk, chunk_tv, &tmp);
338 tv_add(&fc->stream_start, &tmp, &g->start);
339 if (g->num) /* quick hack to avoid buffer underruns */
340 g->start.tv_sec--;
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 = mmd->afd.afhi.eof_tv,
490 *chunk_tv = vss_chunk_time();
491
492 if (!chunk_tv)
493 goto out;
494 list_for_each_entry(fc, &fec_client_list, node) {
495 struct timeval group_duration;
496
497 if (fc->error < 0)
498 continue;
499 tv_scale(fc->group.num_chunks, chunk_tv, &group_duration);
500 if (tv_diff(&timeout, &group_duration, NULL) < 0)
501 timeout = group_duration;
502 }
503 out:
504 tv_add(now, &timeout, &vsst->eof_barrier);
505 }
506
507 /**
508 * Check if vss status flag \a P (playing) is set.
509 *
510 * \return Greater than zero if playing, zero otherwise.
511 *
512 */
513 unsigned int vss_playing(void)
514 {
515 return mmd->new_vss_status_flags & VSS_PLAYING;
516 }
517
518 /**
519 * Check if the \a N (next) status flag is set.
520 *
521 * \return Greater than zero if set, zero if not.
522 *
523 */
524 unsigned int vss_next(void)
525 {
526 return mmd->new_vss_status_flags & VSS_NEXT;
527 }
528
529 /**
530 * Check if a reposition request is pending.
531 *
532 * \return Greater than zero if true, zero otherwise.
533 *
534 */
535 unsigned int vss_repos(void)
536 {
537 return mmd->new_vss_status_flags & VSS_REPOS;
538 }
539
540 /**
541 * Check if the vss is currently paused.
542 *
543 * \return Greater than zero if paused, zero otherwise.
544 *
545 */
546 unsigned int vss_paused(void)
547 {
548 return !(mmd->new_vss_status_flags & VSS_NEXT)
549 && !(mmd->new_vss_status_flags & VSS_PLAYING);
550 }
551
552 /**
553 * Check if the vss is currently stopped.
554 *
555 * \return Greater than zero if paused, zero otherwise.
556 *
557 */
558 unsigned int vss_stopped(void)
559 {
560 return (mmd->new_vss_status_flags & VSS_NEXT)
561 && !(mmd->new_vss_status_flags & VSS_PLAYING);
562 }
563
564 static int chk_barrier(const char *bname, const struct timeval *barrier,
565 struct timeval *diff, int print_log)
566 {
567 long ms;
568
569 if (tv_diff(now, barrier, diff) > 0)
570 return 1;
571 ms = tv2ms(diff);
572 if (print_log && ms)
573 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
574 return -1;
575 }
576
577 /*
578 * != NULL: timeout for next chunk
579 * NULL: nothing to do
580 */
581 static struct timeval *vss_compute_timeout(struct vss_task *vsst)
582 {
583 static struct timeval the_timeout;
584 struct timeval next_chunk;
585
586 if (vss_next() && vsst->map) {
587 /* only sleep a bit, nec*/
588 the_timeout.tv_sec = 0;
589 the_timeout.tv_usec = 100;
590 return &the_timeout;
591 }
592 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
593 &the_timeout, 1) < 0)
594 return &the_timeout;
595 if (chk_barrier("eof", &vsst->eof_barrier, &the_timeout, 1) < 0)
596 return &the_timeout;
597 if (chk_barrier("data send", &vsst->data_send_barrier,
598 &the_timeout, 1) < 0)
599 return &the_timeout;
600 if (!vss_playing() || !vsst->map)
601 return NULL;
602 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
603 &mmd->stream_start, &next_chunk);
604 if (chk_barrier("chunk", &next_chunk, &the_timeout, 0) >= 0) {
605 /* chunk is due or bof */
606 the_timeout.tv_sec = 0;
607 the_timeout.tv_usec = 0;
608 return &the_timeout;
609 }
610 /* compute min of current timeout and next slice time */
611 compute_slice_timeout(&the_timeout);
612 return &the_timeout;
613 }
614
615 static void vss_eof(struct vss_task *vsst)
616 {
617
618 if (!vsst->map)
619 return;
620 if (mmd->new_vss_status_flags & VSS_NOMORE)
621 mmd->new_vss_status_flags = VSS_NEXT;
622 set_eof_barrier(vsst);
623 para_munmap(vsst->map, mmd->size);
624 vsst->map = NULL;
625 mmd->chunks_sent = 0;
626 mmd->offset = 0;
627 mmd->afd.afhi.seconds_total = 0;
628 mmd->afd.afhi.chunk_tv.tv_sec = 0;
629 mmd->afd.afhi.chunk_tv.tv_usec = 0;
630 free(mmd->afd.afhi.chunk_table);
631 mmd->afd.afhi.chunk_table = NULL;
632 free(mmd->afd.afhi.info_string);
633 mmd->afd.afhi.info_string = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_FILE_INFO],
634 status_item_list[SI_TAGINFO1], status_item_list[SI_TAGINFO2]);
635 make_empty_status_items(mmd->afd.verbose_ls_output);
636 mmd->mtime = 0;
637 mmd->size = 0;
638 mmd->events++;
639 }
640
641 /**
642 * Get the list of all supported audio formats.
643 *
644 * \return Aa space separated list of all supported audio formats
645 * It is not allocated at runtime, i.e. there is no need to free
646 * the returned string in the caller.
647 */
648 const char *supported_audio_formats(void)
649 {
650 return SUPPORTED_AUDIO_FORMATS;
651 }
652
653 static int need_to_request_new_audio_file(struct vss_task *vsst)
654 {
655 struct timeval diff;
656
657 if (vsst->map) /* have audio file */
658 return 0;
659 if (!vss_playing()) /* don't need one */
660 return 0;
661 if (mmd->new_vss_status_flags & VSS_NOMORE)
662 return 0;
663 if (vsst->afsss == AFS_SOCKET_AFD_PENDING) /* already requested one */
664 return 0;
665 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
666 &diff, 1) < 0)
667 return 0;
668 return 1;
669 }
670
671 /**
672 * Compute the timeout for the main select-loop of the scheduler.
673 *
674 * \param s Pointer to the server scheduler.
675 * \param t Pointer to the vss task structure.
676 *
677 * Before the timeout is computed, the current vss status flags are evaluated
678 * and acted upon by calling appropriate functions from the lower layers.
679 * Possible actions include
680 *
681 * - request a new audio file from afs,
682 * - shutdown of all senders (stop/pause command),
683 * - reposition the stream (ff/jmp command).
684 */
685 static void vss_pre_select(struct sched *s, struct task *t)
686 {
687 int i;
688 struct timeval *tv, diff;
689 struct vss_task *vsst = container_of(t, struct vss_task, task);
690
691 if (!vsst->map || vss_next() || vss_paused() || vss_repos()) {
692 struct fec_client *fc, *tmp;
693 for (i = 0; senders[i].name; i++)
694 if (senders[i].shutdown_clients)
695 senders[i].shutdown_clients();
696 list_for_each_entry_safe(fc, tmp, &fec_client_list, node) {
697 fc->first_stream_chunk = -1;
698 fc->error = 0;
699 }
700 mmd->stream_start.tv_sec = 0;
701 mmd->stream_start.tv_usec = 0;
702 }
703 if (vss_next())
704 vss_eof(vsst);
705 else if (vss_paused()) {
706 if (mmd->chunks_sent)
707 set_eof_barrier(vsst);
708 mmd->chunks_sent = 0;
709 } else if (vss_repos()) {
710 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
711 set_eof_barrier(vsst);
712 mmd->chunks_sent = 0;
713 mmd->current_chunk = mmd->repos_request;
714 mmd->new_vss_status_flags &= ~VSS_REPOS;
715 }
716 if (need_to_request_new_audio_file(vsst)) {
717 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
718 para_fd_set(vsst->afs_socket, &s->wfds, &s->max_fileno);
719 vsst->afsss = AFS_SOCKET_CHECK_FOR_WRITE;
720 } else
721 para_fd_set(vsst->afs_socket, &s->rfds, &s->max_fileno);
722 for (i = 0; senders[i].name; i++) {
723 if (!senders[i].pre_select)
724 continue;
725 senders[i].pre_select(&s->max_fileno, &s->rfds, &s->wfds);
726 }
727 tv = vss_compute_timeout(vsst);
728 if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
729 s->timeout = *tv;
730 }
731
732 static int recv_afs_msg(int afs_socket, int *fd, uint32_t *code, uint32_t *data)
733 {
734 char control[255], buf[8];
735 struct msghdr msg = {.msg_iov = NULL};
736 struct cmsghdr *cmsg;
737 struct iovec iov;
738 int ret = 0;
739
740 *fd = -1;
741 iov.iov_base = buf;
742 iov.iov_len = sizeof(buf);
743 msg.msg_iov = &iov;
744 msg.msg_iovlen = 1;
745 msg.msg_control = control;
746 msg.msg_controllen = sizeof(control);
747 memset(buf, 0, sizeof(buf));
748 ret = recvmsg(afs_socket, &msg, 0);
749 if (ret < 0)
750 return -ERRNO_TO_PARA_ERROR(errno);
751 if (iov.iov_len != sizeof(buf))
752 return -E_AFS_SHORT_READ;
753 *code = *(uint32_t*)buf;
754 *data = *(uint32_t*)(buf + 4);
755 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
756 if (cmsg->cmsg_level != SOL_SOCKET
757 || cmsg->cmsg_type != SCM_RIGHTS)
758 continue;
759 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
760 continue;
761 *fd = *(int *)CMSG_DATA(cmsg);
762 }
763 return 1;
764 }
765
766 static void recv_afs_result(struct vss_task *vsst)
767 {
768 int ret, passed_fd, shmid;
769 uint32_t afs_code = 0, afs_data = 0;
770 struct stat statbuf;
771
772 vsst->afsss = AFS_SOCKET_READY;
773 ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
774 if (ret < 0)
775 goto err;
776 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
777 afs_data);
778 ret = -E_NOFD;
779 if (afs_code != NEXT_AUDIO_FILE)
780 goto err;
781 if (passed_fd < 0)
782 goto err;
783 shmid = afs_data;
784 free(mmd->afd.afhi.info_string);
785 ret = load_afd(shmid, &mmd->afd);
786 if (ret < 0)
787 goto err;
788 shm_destroy(shmid);
789 ret = fstat(passed_fd, &statbuf);
790 if (ret < 0) {
791 PARA_ERROR_LOG("fstat error:\n");
792 ret = -ERRNO_TO_PARA_ERROR(errno);
793 goto err;
794 }
795 mmd->size = statbuf.st_size;
796 mmd->mtime = statbuf.st_mtime;
797 ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
798 0, &vsst->map);
799 if (ret < 0)
800 goto err;
801 close(passed_fd);
802 mmd->chunks_sent = 0;
803 mmd->current_chunk = 0;
804 mmd->offset = 0;
805 mmd->events++;
806 mmd->num_played++;
807 mmd->new_vss_status_flags &= (~VSS_NEXT);
808 afh_get_header(&mmd->afd.afhi, vsst->map, &vsst->header_buf,
809 &vsst->header_len);
810 return;
811 err:
812 free(mmd->afd.afhi.chunk_table);
813 if (passed_fd >= 0)
814 close(passed_fd);
815 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
816 mmd->new_vss_status_flags = VSS_NEXT;
817 }
818
819 /**
820 * Main sending function.
821 *
822 * This function gets called from vss_post_select(). It checks whether the next
823 * chunk of data should be pushed out. It obtains a pointer to the data to be
824 * sent out as well as its length from mmd->afd.afhi. This information is then
825 * passed to each supported sender's send() function as well as to the send()
826 * functions of each registered fec client.
827 */
828 static void vss_send(struct vss_task *vsst)
829 {
830 int i, sent_something = 0;
831 struct timeval due;
832 struct fec_client *fc, *tmp_fc;
833
834 if (!vsst->map || !vss_playing())
835 return;
836 if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
837 return;
838 if (chk_barrier("data send", &vsst->data_send_barrier,
839 &due, 1) < 0)
840 return;
841 list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
842 if (fc->error < 0)
843 continue;
844 if (!next_slice_is_due(fc, NULL))
845 continue;
846 if (compute_next_fec_slice(fc, vsst) <= 0)
847 continue;
848 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc->group.num,
849 fc->current_slice_num, fc->fcp->max_slice_bytes);
850 fc->fcp->send((char *)fc->enc_buf,
851 fc->fcp->max_slice_bytes,
852 fc->fcp->private_data);
853 fc->current_slice_num++;
854 sent_something = 1;
855 }
856 if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
857 if (!sent_something)
858 mmd->new_vss_status_flags |= VSS_NEXT;
859 return;
860 }
861 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
862 &mmd->stream_start, &due);
863 if (tv_diff(&due, now, NULL) <= 0) {
864 const char *buf;
865 size_t len;
866
867 if (!mmd->chunks_sent) {
868 struct timeval tmp;
869 mmd->stream_start = *now;
870 tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &tmp);
871 mmd->offset = tv2ms(&tmp);
872 mmd->events++;
873 }
874 /*
875 * We call the send function also in case of empty chunks as
876 * they might have still some data queued which can be sent in
877 * this case.
878 */
879 afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
880 &buf, &len);
881 for (i = 0; senders[i].name; i++) {
882 if (!senders[i].send)
883 continue;
884 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
885 buf, len, vsst->header_buf, vsst->header_len);
886 }
887 mmd->chunks_sent++;
888 mmd->current_chunk++;
889 }
890 }
891
892 static void vss_post_select(struct sched *s, struct task *t)
893 {
894 int ret, i;
895 struct vss_task *vsst = container_of(t, struct vss_task, task);
896
897
898 if (mmd->sender_cmd_data.cmd_num >= 0) {
899 int num = mmd->sender_cmd_data.cmd_num,
900 sender_num = mmd->sender_cmd_data.sender_num;
901
902 if (senders[sender_num].client_cmds[num])
903 senders[sender_num].client_cmds[num](&mmd->sender_cmd_data);
904 mmd->sender_cmd_data.cmd_num = -1;
905 }
906 if (vsst->afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
907 if (FD_ISSET(vsst->afs_socket, &s->rfds))
908 recv_afs_result(vsst);
909 } else if (FD_ISSET(vsst->afs_socket, &s->wfds)) {
910 PARA_NOTICE_LOG("requesting new fd from afs\n");
911 ret = send_buffer(vsst->afs_socket, "new");
912 if (ret < 0)
913 PARA_CRIT_LOG("%s\n", para_strerror(-ret));
914 else
915 vsst->afsss = AFS_SOCKET_AFD_PENDING;
916 }
917 for (i = 0; senders[i].name; i++) {
918 if (!senders[i].post_select)
919 continue;
920 senders[i].post_select(&s->rfds, &s->wfds);
921 }
922 if ((vss_playing() && !(mmd->vss_status_flags & VSS_PLAYING)) ||
923 (vss_next() && vss_playing()))
924 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
925 vss_send(vsst);
926 }
927
928 /**
929 * Initialize the virtual streaming system task.
930 *
931 * \param afs_socket The fd for communication with afs.
932 *
933 * This also initializes all supported senders and starts streaming
934 * if the --autoplay command line flag was given.
935 */
936 void init_vss_task(int afs_socket)
937 {
938 static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
939 int i;
940 char *hn = para_hostname(), *home = para_homedir();
941 long unsigned announce_time = conf.announce_time_arg > 0?
942 conf.announce_time_arg : 300,
943 autoplay_delay = conf.autoplay_delay_arg > 0?
944 conf.autoplay_delay_arg : 0;
945 vsst->header_interval.tv_sec = 5; /* should this be configurable? */
946 vsst->afs_socket = afs_socket;
947 vsst->task.pre_select = vss_pre_select;
948 vsst->task.post_select = vss_post_select;
949 ms2tv(announce_time, &vsst->announce_tv);
950 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst->announce_tv));
951 INIT_LIST_HEAD(&fec_client_list);
952 for (i = 0; senders[i].name; i++) {
953 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
954 senders[i].init(&senders[i]);
955 }
956 free(hn);
957 free(home);
958 mmd->sender_cmd_data.cmd_num = -1;
959 make_empty_status_items(mmd->afd.verbose_ls_output);
960 if (conf.autoplay_given) {
961 struct timeval tmp;
962 mmd->vss_status_flags |= VSS_PLAYING;
963 mmd->new_vss_status_flags |= VSS_PLAYING;
964 ms2tv(autoplay_delay, &tmp);
965 tv_add(now, &tmp, &vsst->autoplay_barrier);
966 tv_add(&vsst->autoplay_barrier, &vsst->announce_tv,
967 &vsst->data_send_barrier);
968 }
969 register_task(&vsst->task);
970 }