Fix initialization of fec_client_list.
[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 };
91
92 /**
93 * The list of currently connected fec clients.
94 *
95 * Senders may use \ref vss_add_fec_client() to add entries to the list.
96 */
97 static struct list_head fec_client_list;
98
99 /**
100 * Describes one slice of a FEC group.
101 *
102 * FEC slices directly correspond to the data packages sent by the paraslash
103 * senders that use FEC. Each slice is identified by its group number and its
104 * number within the group. All slices have the same size, but the last slice
105 * of the group may not be filled entirely.
106 */
107 struct fec_slice {
108 /** The slice number within the FEC group. */
109 uint8_t num;
110 /** The number of used bytes in this slice. */
111 uint16_t bytes;
112 };
113
114 /**
115 * Data associated with one FEC group.
116 *
117 * A FEC group consists of a fixed number of slices and this number is given by
118 * the \a slices_per_group parameter of struct \ref fec_client_parms. Each FEC
119 * group contains a number of chunks of the current audio file.
120 */
121 struct fec_group {
122 /** The number of the FEC group. */
123 uint32_t num;
124 /** Number of bytes in this group. */
125 uint32_t bytes;
126 /** The first chunk of the current audio file belonging to the group. */
127 uint32_t first_chunk;
128 /** The number of chunks contained in this group. */
129 uint32_t num_chunks;
130 /** The time needed to play all chunks of the group. */
131 struct timeval duration;
132 /** When the first chunk was sent. */
133 struct timeval start;
134 /** \a The group duration divided by \a slices_per_group. */
135 struct timeval slice_duration;
136 };
137
138 /**
139 * Describes one connected FEC client.
140 */
141 struct fec_client {
142 /** Parameters requested by the client. */
143 struct fec_client_parms *fcp;
144 /** Used by the core FEC code. */
145 struct fec_parms *parms;
146 /** The position of this client in the fec client list. */
147 struct list_head node;
148 /** When the first slice for this client was sent. */
149 struct timeval stream_start;
150 /** The first chunk sent to this FEC client. */
151 int first_stream_chunk;
152 /** Describes the current group. */
153 struct fec_group group;
154 /** Describes the current slice. */
155 struct fec_slice slice;
156 /** The data to be FEC-encoded (point to a region within the mapped audio file). */
157 const unsigned char **src_data;
158 /** Used for the last source pointer of the last group. */
159 unsigned char *extra_src_buf;
160 /** The size of the buffer for the extra source pointer. */
161 size_t extra_src_buf_size;
162 /** Contains FEC-encoded data. */
163 unsigned char *enc_buf;
164 /** Size of \a enc_buf. */
165 size_t enc_buf_size;
166 };
167
168 /**
169 * Get the chunk time of the current audio file.
170 *
171 * \return A pointer to a struct containing the chunk time, or NULL,
172 * if currently no audio file is selected.
173 */
174 struct timeval *vss_chunk_time(void)
175 {
176 if (mmd->afd.afhi.chunk_tv.tv_sec == 0 &&
177 mmd->afd.afhi.chunk_tv.tv_usec == 0)
178 return NULL;
179 return &mmd->afd.afhi.chunk_tv;
180 }
181
182 /**
183 * Write a fec header to a buffer.
184 *
185 * \param buf The buffer to write to.
186 * \param h The fec header to write.
187 */
188 static void write_fec_header(struct fec_client *fc)
189 {
190 char *buf = (char *)fc->enc_buf;
191
192 write_u32(buf, FEC_MAGIC);
193
194 write_u8(buf + 4, fc->fcp->slices_per_group);
195 write_u8(buf + 5, fc->fcp->data_slices_per_group);
196 write_u32(buf + 6, (uint32_t)0); /* audio header len */
197
198 write_u32(buf + 10, fc->group.num);
199 write_u32(buf + 14, fc->group.bytes);
200
201 write_u8(buf + 18, fc->slice.num);
202 write_u16(buf + 20, fc->slice.bytes);
203 memset(buf + 22, 0, 11);
204 }
205
206 static int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
207 {
208 uint32_t max_group_size, last_payload_size;
209 int i, k = fc->fcp->data_slices_per_group;
210 size_t len;
211 const char *start_buf;
212 struct timeval tmp, *chunk_tv = vss_chunk_time();
213
214 assert(chunk_tv);
215 if (fc->first_stream_chunk < 0) {
216 fc->stream_start = *now;
217 fc->first_stream_chunk = mmd->current_chunk;
218 fc->group.first_chunk = mmd->current_chunk;
219 fc->group.num = 0;
220 } else {
221 fc->group.first_chunk += fc->group.num_chunks;
222 fc->group.num++;
223 }
224 if (fc->group.first_chunk >= mmd->afd.afhi.chunks_total)
225 return 0;
226 max_group_size = (fc->fcp->max_slice_bytes - FEC_HEADER_SIZE) * k;
227 afh_get_chunk(fc->group.first_chunk, &mmd->afd.afhi, vsst->map,
228 &start_buf, &len);
229 for (i = fc->group.first_chunk, fc->group.bytes = 0;
230 i < mmd->afd.afhi.chunks_total; i++) {
231 const char *buf;
232
233 afh_get_chunk(i, &mmd->afd.afhi, vsst->map, &buf, &len);
234 if (fc->group.bytes + len > max_group_size)
235 break;
236 fc->group.bytes += len;
237 }
238 fc->group.num_chunks = i - fc->group.first_chunk;
239 fc->slice.num = 0;
240 fc->slice.bytes = ROUND_UP(fc->group.bytes, k) / k;
241
242 /* The last slice will not be fully used */
243 last_payload_size = fc->group.bytes % fc->slice.bytes;
244 if (!last_payload_size)
245 last_payload_size = fc->slice.bytes;
246
247 tv_scale(fc->group.first_chunk - fc->first_stream_chunk, chunk_tv,
248 &tmp);
249 tv_add(&fc->stream_start, &tmp, &fc->group.start);
250 if (fc->group.num) /* quick hack to avoid buffer underruns */
251 fc->group.start.tv_sec--;
252 tv_scale(fc->group.num_chunks, chunk_tv, &fc->group.duration);
253 tv_divide(fc->fcp->slices_per_group, &fc->group.duration,
254 &fc->group.slice_duration);
255
256 for (i = 0; i < k; i++)
257 fc->src_data[i] = (const unsigned char *)start_buf
258 + i * fc->slice.bytes;
259
260 if (start_buf + k * fc->slice.bytes > vsst->map + mmd->size) {
261 /* can not use last slice as it goes beyond the map */
262 if (fc->extra_src_buf_size < fc->slice.bytes) {
263 fc->extra_src_buf = para_realloc(fc->extra_src_buf, fc->slice.bytes);
264 fc->extra_src_buf_size = fc->slice.bytes;
265 }
266 memcpy(fc->extra_src_buf, start_buf + (k - 1) * fc->slice.bytes,
267 last_payload_size);
268 memset(fc->extra_src_buf + last_payload_size, 0,
269 fc->slice.bytes - last_payload_size);
270 fc->src_data[k - 1] = fc->extra_src_buf;
271 }
272 if (fc->enc_buf_size < fc->slice.bytes + FEC_HEADER_SIZE) {
273 fc->enc_buf_size = fc->slice.bytes + FEC_HEADER_SIZE;
274 fc->enc_buf = para_realloc(fc->enc_buf, fc->enc_buf_size);
275 }
276 PARA_INFO_LOG("FEC group %d: %d chunks (%d - %d), duration: %lums\n",
277 fc->group.num, fc->group.num_chunks, fc->group.first_chunk,
278 fc->group.first_chunk + fc->group.num_chunks - 1,
279 tv2ms(&fc->group.duration));
280 return 1;
281 }
282
283 static int compute_next_fec_slice(struct fec_client *fc, struct vss_task *vsst)
284 {
285 if (fc->first_stream_chunk < 0 || fc->slice.num
286 == fc->fcp->slices_per_group) {
287 if (!setup_next_fec_group(fc, vsst))
288 return 0;
289 }
290 write_fec_header(fc);
291 fec_encode(fc->parms, fc->src_data, fc->enc_buf + FEC_HEADER_SIZE,
292 fc->slice.num, fc->slice.bytes);
293 return 1;
294 }
295
296 /**
297 * Return a buffer that marks the end of the stream.
298 *
299 * \param buf Result pointer.
300 * \return The length of the eof buffer.
301 *
302 * This is used for (multicast) udp streaming where closing the socket on the
303 * sender might not give rise to an eof condition at the peer.
304 */
305 size_t vss_get_fec_eof_packet(const char **buf)
306 {
307 static const char fec_eof_packet[FEC_HEADER_SIZE] = FEC_EOF_PACKET;
308 *buf = fec_eof_packet;
309 return FEC_HEADER_SIZE;
310 }
311
312 /**
313 * Add one entry to the list of active fec clients.
314 *
315 * \param fcp Describes the fec parameters to be used for this client.
316 * \param result An opaque pointer that must be used by remove the client later.
317 *
318 * \return Standard.
319 */
320 int vss_add_fec_client(struct fec_client_parms *fcp, struct fec_client **result)
321 {
322 int ret;
323 struct fec_client *fc;
324
325 if (fcp->max_slice_bytes < FEC_HEADER_SIZE + fcp->data_slices_per_group)
326 return -ERRNO_TO_PARA_ERROR(EINVAL);
327 fc = para_calloc(sizeof(*fc));
328 fc->fcp = fcp;
329 ret = fec_new(fcp->data_slices_per_group, fcp->slices_per_group,
330 &fc->parms);
331 if (ret < 0)
332 goto err;
333 fc->first_stream_chunk = -1; /* stream not yet started */
334 fc->src_data = para_malloc(fc->fcp->slices_per_group * sizeof(char *));
335 para_list_add(&fc->node, &fec_client_list);
336 *result = fc;
337 return 1;
338 err:
339 fec_free(fc->parms);
340 free(fc);
341 *result = NULL;
342 return ret;
343 }
344
345 /**
346 * Remove one entry from the list of active fec clients.
347 *
348 * \param fc The client to be removed.
349 */
350 void vss_del_fec_client(struct fec_client *fc)
351 {
352 list_del(&fc->node);
353 free(fc->src_data);
354 free(fc->enc_buf);
355 free(fc->extra_src_buf);
356 fec_free(fc->parms);
357 free(fc);
358 }
359
360 /*
361 * Compute if/when next slice is due. If it isn't due yet and \a diff is
362 * not \p Null, compute the time difference next - now, where
363 *
364 * next = stream_start + (first_group_chunk - first_stream_chunk)
365 * * chunk_time + slice_num * slice_time
366 */
367 static int next_slice_is_due(struct fec_client *fc, struct timeval *diff)
368 {
369 struct timeval tmp, next;
370 int ret;
371
372 if (fc->first_stream_chunk < 0)
373 return 1;
374 tv_scale(fc->slice.num, &fc->group.slice_duration, &tmp);
375 tv_add(&tmp, &fc->group.start, &next);
376 ret = tv_diff(&next, now, diff);
377 return ret < 0? 1 : 0;
378 }
379
380 static void compute_slice_timeout(struct timeval *timeout)
381 {
382 struct fec_client *fc;
383
384 assert(vss_playing());
385 list_for_each_entry(fc, &fec_client_list, node) {
386 struct timeval diff;
387
388 if (next_slice_is_due(fc, &diff)) {
389 timeout->tv_sec = 0;
390 timeout->tv_usec = 0;
391 return;
392 }
393 /* timeout = min(timeout, diff) */
394 if (tv_diff(&diff, timeout, NULL) < 0)
395 *timeout = diff;
396 }
397 }
398
399 /**
400 * Check if vss status flag \a P (playing) is set.
401 *
402 * \return Greater than zero if playing, zero otherwise.
403 *
404 */
405 unsigned int vss_playing(void)
406 {
407 return mmd->new_vss_status_flags & VSS_PLAYING;
408 }
409
410 /**
411 * Check if the \a N (next) status flag is set.
412 *
413 * \return Greater than zero if set, zero if not.
414 *
415 */
416 unsigned int vss_next(void)
417 {
418 return mmd->new_vss_status_flags & VSS_NEXT;
419 }
420
421 /**
422 * Check if a reposition request is pending.
423 *
424 * \return Greater than zero if true, zero otherwise.
425 *
426 */
427 unsigned int vss_repos(void)
428 {
429 return mmd->new_vss_status_flags & VSS_REPOS;
430 }
431
432 /**
433 * Check if the vss is currently paused.
434 *
435 * \return Greater than zero if paused, zero otherwise.
436 *
437 */
438 unsigned int vss_paused(void)
439 {
440 return !(mmd->new_vss_status_flags & VSS_NEXT)
441 && !(mmd->new_vss_status_flags & VSS_PLAYING);
442 }
443
444 /**
445 * Check if the vss is currently stopped.
446 *
447 * \return Greater than zero if paused, zero otherwise.
448 *
449 */
450 unsigned int vss_stopped(void)
451 {
452 return (mmd->new_vss_status_flags & VSS_NEXT)
453 && !(mmd->new_vss_status_flags & VSS_PLAYING);
454 }
455
456 static int chk_barrier(const char *bname, const struct timeval *barrier,
457 struct timeval *diff, int print_log)
458 {
459 long ms;
460
461 if (tv_diff(now, barrier, diff) > 0)
462 return 1;
463 ms = tv2ms(diff);
464 if (print_log && ms)
465 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
466 return -1;
467 }
468
469 /*
470 * != NULL: timeout for next chunk
471 * NULL: nothing to do
472 */
473 static struct timeval *vss_compute_timeout(struct vss_task *vsst)
474 {
475 static struct timeval the_timeout;
476 struct timeval next_chunk;
477
478 if (vss_next() && vsst->map) {
479 /* only sleep a bit, nec*/
480 the_timeout.tv_sec = 0;
481 the_timeout.tv_usec = 100;
482 return &the_timeout;
483 }
484 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
485 &the_timeout, 1) < 0)
486 return &the_timeout;
487 if (chk_barrier("eof", &vsst->eof_barrier, &the_timeout, 1) < 0)
488 return &the_timeout;
489 if (chk_barrier("data send", &vsst->data_send_barrier,
490 &the_timeout, 1) < 0)
491 return &the_timeout;
492 if (!vss_playing() || !vsst->map)
493 return NULL;
494 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
495 &mmd->stream_start, &next_chunk);
496 if (chk_barrier("chunk", &next_chunk, &the_timeout, 0) >= 0) {
497 /* chunk is due or bof */
498 the_timeout.tv_sec = 0;
499 the_timeout.tv_usec = 0;
500 return &the_timeout;
501 }
502 /* compute min of current timeout and next slice time */
503 compute_slice_timeout(&the_timeout);
504 return &the_timeout;
505 }
506
507 static void vss_eof(struct vss_task *vsst)
508 {
509
510 mmd->stream_start = *now;
511 if (!vsst->map)
512 return;
513 if (mmd->new_vss_status_flags & VSS_NOMORE)
514 mmd->new_vss_status_flags = VSS_NEXT;
515 tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
516 para_munmap(vsst->map, mmd->size);
517 vsst->map = NULL;
518 mmd->chunks_sent = 0;
519 mmd->offset = 0;
520 mmd->afd.afhi.seconds_total = 0;
521 mmd->afd.afhi.chunk_tv.tv_sec = 0;
522 mmd->afd.afhi.chunk_tv.tv_usec = 0;
523 free(mmd->afd.afhi.chunk_table);
524 mmd->afd.afhi.chunk_table = NULL;
525 free(mmd->afd.afhi.info_string);
526 mmd->afd.afhi.info_string = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_FILE_INFO],
527 status_item_list[SI_TAGINFO1], status_item_list[SI_TAGINFO2]);
528 make_empty_status_items(mmd->afd.verbose_ls_output);
529 mmd->mtime = 0;
530 mmd->size = 0;
531 mmd->events++;
532 }
533
534 /**
535 * Get the list of all supported audio formats.
536 *
537 * \return Aa space separated list of all supported audio formats
538 * It is not allocated at runtime, i.e. there is no need to free
539 * the returned string in the caller.
540 */
541 const char *supported_audio_formats(void)
542 {
543 return SUPPORTED_AUDIO_FORMATS;
544 }
545
546 static int need_to_request_new_audio_file(struct vss_task *vsst)
547 {
548 struct timeval diff;
549
550 if (vsst->map) /* have audio file */
551 return 0;
552 if (!vss_playing()) /* don't need one */
553 return 0;
554 if (mmd->new_vss_status_flags & VSS_NOMORE)
555 return 0;
556 if (vsst->afsss == AFS_SOCKET_AFD_PENDING) /* already requested one */
557 return 0;
558 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
559 &diff, 1) < 0)
560 return 0;
561 return 1;
562 }
563
564
565
566 /**
567 * Compute the timeout for para_server's main select-loop.
568 *
569 * This function gets called from para_server to determine the timeout value
570 * for its main select loop.
571 *
572 * \param s Pointer to the server scheduler.
573 * \param t Pointer to the vss task structure.
574 *
575 * Before the timeout is computed, the current vss status flags are evaluated
576 * and acted upon by calling appropriate functions from the lower layers.
577 * Possible actions include
578 *
579 * - request a new audio file from afs,
580 * - shutdown of all senders (stop/pause command),
581 * - reposition the stream (ff/jmp command).
582 */
583 static void vss_pre_select(struct sched *s, struct task *t)
584 {
585 int i;
586 struct timeval *tv, diff;
587 struct vss_task *vsst = container_of(t, struct vss_task, task);
588
589 if (!vsst->map || vss_next() || vss_paused() || vss_repos()) {
590 struct fec_client *fc, *tmp;
591 for (i = 0; senders[i].name; i++)
592 if (senders[i].shutdown_clients)
593 senders[i].shutdown_clients();
594 list_for_each_entry_safe(fc, tmp, &fec_client_list, node)
595 fc->first_stream_chunk = -1;
596 }
597 if (vss_next())
598 vss_eof(vsst);
599 else if (vss_paused()) {
600 if (mmd->chunks_sent)
601 tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
602 mmd->chunks_sent = 0;
603 } else if (vss_repos()) {
604 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
605 tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
606 mmd->chunks_sent = 0;
607 mmd->current_chunk = mmd->repos_request;
608 mmd->new_vss_status_flags &= ~VSS_REPOS;
609 }
610 if (need_to_request_new_audio_file(vsst)) {
611 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
612 para_fd_set(vsst->afs_socket, &s->wfds, &s->max_fileno);
613 vsst->afsss = AFS_SOCKET_CHECK_FOR_WRITE;
614 } else
615 para_fd_set(vsst->afs_socket, &s->rfds, &s->max_fileno);
616 for (i = 0; senders[i].name; i++) {
617 if (!senders[i].pre_select)
618 continue;
619 senders[i].pre_select(&s->max_fileno, &s->rfds, &s->wfds);
620 }
621 tv = vss_compute_timeout(vsst);
622 if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
623 s->timeout = *tv;
624 }
625
626 static int recv_afs_msg(int afs_socket, int *fd, uint32_t *code, uint32_t *data)
627 {
628 char control[255], buf[8];
629 struct msghdr msg = {.msg_iov = NULL};
630 struct cmsghdr *cmsg;
631 struct iovec iov;
632 int ret = 0;
633
634 *fd = -1;
635 iov.iov_base = buf;
636 iov.iov_len = sizeof(buf);
637 msg.msg_iov = &iov;
638 msg.msg_iovlen = 1;
639 msg.msg_control = control;
640 msg.msg_controllen = sizeof(control);
641 memset(buf, 0, sizeof(buf));
642 ret = recvmsg(afs_socket, &msg, 0);
643 if (ret < 0)
644 return -ERRNO_TO_PARA_ERROR(errno);
645 if (iov.iov_len != sizeof(buf))
646 return -E_AFS_SHORT_READ;
647 *code = *(uint32_t*)buf;
648 *data = *(uint32_t*)(buf + 4);
649 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
650 if (cmsg->cmsg_level != SOL_SOCKET
651 || cmsg->cmsg_type != SCM_RIGHTS)
652 continue;
653 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
654 continue;
655 *fd = *(int *)CMSG_DATA(cmsg);
656 }
657 return 1;
658 }
659
660 static void recv_afs_result(struct vss_task *vsst)
661 {
662 int ret, passed_fd, shmid;
663 uint32_t afs_code = 0, afs_data = 0;
664 struct stat statbuf;
665
666 vsst->afsss = AFS_SOCKET_READY;
667 mmd->afd.afhi.chunk_table = NULL;
668 ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
669 if (ret < 0)
670 goto err;
671 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
672 afs_data);
673 ret = -E_NOFD;
674 if (afs_code != NEXT_AUDIO_FILE)
675 goto err;
676 if (passed_fd < 0)
677 goto err;
678 shmid = afs_data;
679 ret = load_afd(shmid, &mmd->afd);
680 if (ret < 0)
681 goto err;
682 shm_destroy(shmid);
683 ret = fstat(passed_fd, &statbuf);
684 if (ret < 0) {
685 PARA_ERROR_LOG("fstat error:\n");
686 ret = -ERRNO_TO_PARA_ERROR(errno);
687 goto err;
688 }
689 mmd->size = statbuf.st_size;
690 mmd->mtime = statbuf.st_mtime;
691 ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
692 0, &vsst->map);
693 if (ret < 0)
694 goto err;
695 close(passed_fd);
696 mmd->chunks_sent = 0;
697 mmd->current_chunk = 0;
698 mmd->offset = 0;
699 mmd->events++;
700 mmd->num_played++;
701 mmd->new_vss_status_flags &= (~VSS_NEXT);
702 afh_get_header(&mmd->afd.afhi, vsst->map, &vsst->header_buf,
703 &vsst->header_len);
704 return;
705 err:
706 free(mmd->afd.afhi.chunk_table);
707 if (passed_fd >= 0)
708 close(passed_fd);
709 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
710 mmd->new_vss_status_flags = VSS_NEXT;
711 }
712
713 /**
714 * Main sending function.
715 *
716 * This function gets called from vss_post_select(). It checks whether the next
717 * chunk of data should be pushed out. It obtains a pointer to the data to be
718 * sent out as well as its length from mmd->afd.afhi. This information is then
719 * passed to each supported sender's send() function as well as to the send()
720 * functions of each registered fec client.
721 */
722 static void vss_send(struct vss_task *vsst)
723 {
724 int i;
725 struct timeval due;
726 struct fec_client *fc, *tmp_fc;
727
728 if (!vsst->map || !vss_playing())
729 return;
730 if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
731 return;
732 if (chk_barrier("data send", &vsst->data_send_barrier,
733 &due, 1) < 0)
734 return;
735 if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
736 mmd->new_vss_status_flags |= VSS_NEXT;
737 return;
738 }
739 if (!mmd->chunks_sent) {
740 struct timeval tmp;
741 mmd->stream_start = *now;
742 tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &tmp);
743 mmd->offset = tv2ms(&tmp);
744 mmd->events++;
745 }
746 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
747 &mmd->stream_start, &due);
748 if (tv_diff(&due, now, NULL) <= 0) {
749 const char *buf;
750 size_t len;
751 /*
752 * We call the send function also in case of empty chunks as
753 * they might have still some data queued which can be sent in
754 * this case.
755 */
756 afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
757 &buf, &len);
758 for (i = 0; senders[i].name; i++) {
759 if (!senders[i].send)
760 continue;
761 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
762 buf, len, vsst->header_buf, vsst->header_len);
763 }
764 }
765 list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
766 if (!next_slice_is_due(fc, NULL))
767 continue;
768 if (!compute_next_fec_slice(fc, vsst))
769 continue;
770 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc->group.num,
771 fc->slice.num, fc->slice.bytes);
772 fc->fcp->send((char *)fc->enc_buf,
773 fc->slice.bytes + FEC_HEADER_SIZE,
774 fc->fcp->private_data);
775 fc->slice.num++;
776 }
777 mmd->new_vss_status_flags |= VSS_PLAYING;
778 mmd->chunks_sent++;
779 mmd->current_chunk++;
780 }
781
782 static void vss_post_select(struct sched *s, struct task *t)
783 {
784 int ret, i;
785 struct vss_task *vsst = container_of(t, struct vss_task, task);
786
787 if (mmd->sender_cmd_data.cmd_num >= 0) {
788 int num = mmd->sender_cmd_data.cmd_num,
789 sender_num = mmd->sender_cmd_data.sender_num;
790
791 if (senders[sender_num].client_cmds[num])
792 senders[sender_num].client_cmds[num](&mmd->sender_cmd_data);
793 mmd->sender_cmd_data.cmd_num = -1;
794 }
795 if (vsst->afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
796 if (FD_ISSET(vsst->afs_socket, &s->rfds))
797 recv_afs_result(vsst);
798 } else if (FD_ISSET(vsst->afs_socket, &s->wfds)) {
799 PARA_NOTICE_LOG("requesting new fd from afs\n");
800 ret = send_buffer(vsst->afs_socket, "new");
801 vsst->afsss = AFS_SOCKET_AFD_PENDING;
802 }
803 for (i = 0; senders[i].name; i++) {
804 if (!senders[i].post_select)
805 continue;
806 senders[i].post_select(&s->rfds, &s->wfds);
807 }
808 if ((vss_playing() && !(mmd->vss_status_flags & VSS_PLAYING)) ||
809 (vss_next() && vss_playing()))
810 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
811 vss_send(vsst);
812 }
813
814 /**
815 * Initialize the virtual streaming system task.
816 *
817 * \param afs_socket The fd for communication with afs.
818 *
819 * This also initializes all supported senders and starts streaming
820 * if the --autoplay command line flag was given.
821 */
822 void init_vss_task(int afs_socket)
823 {
824 static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
825 int i;
826 char *hn = para_hostname(), *home = para_homedir();
827 long unsigned announce_time = conf.announce_time_arg > 0?
828 conf.announce_time_arg : 300,
829 autoplay_delay = conf.autoplay_delay_arg > 0?
830 conf.autoplay_delay_arg : 0;
831
832 vsst->afs_socket = afs_socket;
833 vsst->task.pre_select = vss_pre_select;
834 vsst->task.post_select = vss_post_select;
835 ms2tv(announce_time, &vsst->announce_tv);
836 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst->announce_tv));
837 INIT_LIST_HEAD(&fec_client_list);
838 for (i = 0; senders[i].name; i++) {
839 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
840 senders[i].init(&senders[i]);
841 }
842 free(hn);
843 free(home);
844 mmd->sender_cmd_data.cmd_num = -1;
845 make_empty_status_items(mmd->afd.verbose_ls_output);
846 if (conf.autoplay_given) {
847 struct timeval tmp;
848 mmd->vss_status_flags |= VSS_PLAYING;
849 mmd->new_vss_status_flags |= VSS_PLAYING;
850 ms2tv(autoplay_delay, &tmp);
851 tv_add(now, &tmp, &vsst->autoplay_barrier);
852 tv_add(&vsst->autoplay_barrier, &vsst->announce_tv,
853 &vsst->data_send_barrier);
854 }
855 register_task(&vsst->task);
856 }