Fix some gcc warnings on x86_64.
[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] =
308 "\xec\x0d\xcc\xfe\0\0\0\0"
309 "\0\0\0\0\0\0\0\0"
310 "\0\0\0\0\0\0\0\0"
311 "\0\0\0\0\0\0\0\0";
312 *buf = fec_eof_packet;
313 return FEC_HEADER_SIZE;
314 }
315
316 /**
317 * Add one entry to the list of active fec clients.
318 *
319 * \param fcp Describes the fec parameters to be used for this client.
320 * \param result An opaque pointer that must be used by remove the client later.
321 *
322 * \return Standard.
323 */
324 int vss_add_fec_client(struct fec_client_parms *fcp, struct fec_client **result)
325 {
326 int ret;
327 struct fec_client *fc;
328
329 if (fcp->max_slice_bytes < FEC_HEADER_SIZE + fcp->data_slices_per_group)
330 return -ERRNO_TO_PARA_ERROR(EINVAL);
331 fc = para_calloc(sizeof(*fc));
332 fc->fcp = fcp;
333 ret = fec_new(fcp->data_slices_per_group, fcp->slices_per_group,
334 &fc->parms);
335 if (ret < 0)
336 goto err;
337 fc->first_stream_chunk = -1; /* stream not yet started */
338 fc->src_data = para_malloc(fc->fcp->slices_per_group * sizeof(char *));
339 para_list_add(&fc->node, &fec_client_list);
340 *result = fc;
341 return 1;
342 err:
343 fec_free(fc->parms);
344 free(fc);
345 *result = NULL;
346 return ret;
347 }
348
349 /**
350 * Remove one entry from the list of active fec clients.
351 *
352 * \param fc The client to be removed.
353 */
354 void vss_del_fec_client(struct fec_client *fc)
355 {
356 list_del(&fc->node);
357 free(fc->src_data);
358 free(fc->enc_buf);
359 free(fc->extra_src_buf);
360 fec_free(fc->parms);
361 free(fc);
362 }
363
364 /*
365 * Compute if/when next slice is due. If it isn't due yet and \a diff is
366 * not \p Null, compute the time difference next - now, where
367 *
368 * next = stream_start + (first_group_chunk - first_stream_chunk)
369 * * chunk_time + slice_num * slice_time
370 */
371 static int next_slice_is_due(struct fec_client *fc, struct timeval *diff)
372 {
373 struct timeval tmp, next;
374 int ret;
375
376 if (fc->first_stream_chunk < 0)
377 return 1;
378 tv_scale(fc->slice.num, &fc->group.slice_duration, &tmp);
379 tv_add(&tmp, &fc->group.start, &next);
380 ret = tv_diff(&next, now, diff);
381 return ret < 0? 1 : 0;
382 }
383
384 static void compute_slice_timeout(struct timeval *timeout)
385 {
386 struct fec_client *fc;
387
388 assert(vss_playing());
389 list_for_each_entry(fc, &fec_client_list, node) {
390 struct timeval diff;
391
392 if (next_slice_is_due(fc, &diff)) {
393 timeout->tv_sec = 0;
394 timeout->tv_usec = 0;
395 return;
396 }
397 /* timeout = min(timeout, diff) */
398 if (tv_diff(&diff, timeout, NULL) < 0)
399 *timeout = diff;
400 }
401 }
402
403 /**
404 * Check if vss status flag \a P (playing) is set.
405 *
406 * \return Greater than zero if playing, zero otherwise.
407 *
408 */
409 unsigned int vss_playing(void)
410 {
411 return mmd->new_vss_status_flags & VSS_PLAYING;
412 }
413
414 /**
415 * Check if the \a N (next) status flag is set.
416 *
417 * \return Greater than zero if set, zero if not.
418 *
419 */
420 unsigned int vss_next(void)
421 {
422 return mmd->new_vss_status_flags & VSS_NEXT;
423 }
424
425 /**
426 * Check if a reposition request is pending.
427 *
428 * \return Greater than zero if true, zero otherwise.
429 *
430 */
431 unsigned int vss_repos(void)
432 {
433 return mmd->new_vss_status_flags & VSS_REPOS;
434 }
435
436 /**
437 * Check if the vss is currently paused.
438 *
439 * \return Greater than zero if paused, zero otherwise.
440 *
441 */
442 unsigned int vss_paused(void)
443 {
444 return !(mmd->new_vss_status_flags & VSS_NEXT)
445 && !(mmd->new_vss_status_flags & VSS_PLAYING);
446 }
447
448 /**
449 * Check if the vss is currently stopped.
450 *
451 * \return Greater than zero if paused, zero otherwise.
452 *
453 */
454 unsigned int vss_stopped(void)
455 {
456 return (mmd->new_vss_status_flags & VSS_NEXT)
457 && !(mmd->new_vss_status_flags & VSS_PLAYING);
458 }
459
460 static int chk_barrier(const char *bname, const struct timeval *barrier,
461 struct timeval *diff, int print_log)
462 {
463 long ms;
464
465 if (tv_diff(now, barrier, diff) > 0)
466 return 1;
467 ms = tv2ms(diff);
468 if (print_log && ms)
469 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
470 return -1;
471 }
472
473 /*
474 * != NULL: timeout for next chunk
475 * NULL: nothing to do
476 */
477 static struct timeval *vss_compute_timeout(struct vss_task *vsst)
478 {
479 static struct timeval the_timeout;
480 struct timeval next_chunk;
481
482 if (vss_next() && vsst->map) {
483 /* only sleep a bit, nec*/
484 the_timeout.tv_sec = 0;
485 the_timeout.tv_usec = 100;
486 return &the_timeout;
487 }
488 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
489 &the_timeout, 1) < 0)
490 return &the_timeout;
491 if (chk_barrier("eof", &vsst->eof_barrier, &the_timeout, 1) < 0)
492 return &the_timeout;
493 if (chk_barrier("data send", &vsst->data_send_barrier,
494 &the_timeout, 1) < 0)
495 return &the_timeout;
496 if (!vss_playing() || !vsst->map)
497 return NULL;
498 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
499 &mmd->stream_start, &next_chunk);
500 if (chk_barrier("chunk", &next_chunk, &the_timeout, 0) >= 0) {
501 /* chunk is due or bof */
502 the_timeout.tv_sec = 0;
503 the_timeout.tv_usec = 0;
504 return &the_timeout;
505 }
506 /* compute min of current timeout and next slice time */
507 compute_slice_timeout(&the_timeout);
508 return &the_timeout;
509 }
510
511 static void vss_eof(struct vss_task *vsst)
512 {
513
514 mmd->stream_start = *now;
515 if (!vsst->map)
516 return;
517 if (mmd->new_vss_status_flags & VSS_NOMORE)
518 mmd->new_vss_status_flags = VSS_NEXT;
519 tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
520 para_munmap(vsst->map, mmd->size);
521 vsst->map = NULL;
522 mmd->chunks_sent = 0;
523 mmd->offset = 0;
524 mmd->afd.afhi.seconds_total = 0;
525 mmd->afd.afhi.chunk_tv.tv_sec = 0;
526 mmd->afd.afhi.chunk_tv.tv_usec = 0;
527 free(mmd->afd.afhi.chunk_table);
528 mmd->afd.afhi.chunk_table = NULL;
529 free(mmd->afd.afhi.info_string);
530 mmd->afd.afhi.info_string = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_FILE_INFO],
531 status_item_list[SI_TAGINFO1], status_item_list[SI_TAGINFO2]);
532 make_empty_status_items(mmd->afd.verbose_ls_output);
533 mmd->mtime = 0;
534 mmd->size = 0;
535 mmd->events++;
536 }
537
538 /**
539 * Get the list of all supported audio formats.
540 *
541 * \return Aa space separated list of all supported audio formats
542 * It is not allocated at runtime, i.e. there is no need to free
543 * the returned string in the caller.
544 */
545 const char *supported_audio_formats(void)
546 {
547 return SUPPORTED_AUDIO_FORMATS;
548 }
549
550 static int need_to_request_new_audio_file(struct vss_task *vsst)
551 {
552 struct timeval diff;
553
554 if (vsst->map) /* have audio file */
555 return 0;
556 if (!vss_playing()) /* don't need one */
557 return 0;
558 if (mmd->new_vss_status_flags & VSS_NOMORE)
559 return 0;
560 if (vsst->afsss == AFS_SOCKET_AFD_PENDING) /* already requested one */
561 return 0;
562 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
563 &diff, 1) < 0)
564 return 0;
565 return 1;
566 }
567
568
569
570 /**
571 * Compute the timeout for para_server's main select-loop.
572 *
573 * This function gets called from para_server to determine the timeout value
574 * for its main select loop.
575 *
576 * \param s Pointer to the server scheduler.
577 * \param t Pointer to the vss task structure.
578 *
579 * Before the timeout is computed, the current vss status flags are evaluated
580 * and acted upon by calling appropriate functions from the lower layers.
581 * Possible actions include
582 *
583 * - request a new audio file from afs,
584 * - shutdown of all senders (stop/pause command),
585 * - reposition the stream (ff/jmp command).
586 */
587 static void vss_pre_select(struct sched *s, struct task *t)
588 {
589 int i;
590 struct timeval *tv, diff;
591 struct vss_task *vsst = container_of(t, struct vss_task, task);
592
593 if (!vsst->map || vss_next() || vss_paused() || vss_repos()) {
594 struct fec_client *fc, *tmp;
595 for (i = 0; senders[i].name; i++)
596 if (senders[i].shutdown_clients)
597 senders[i].shutdown_clients();
598 list_for_each_entry_safe(fc, tmp, &fec_client_list, node)
599 fc->first_stream_chunk = -1;
600 }
601 if (vss_next())
602 vss_eof(vsst);
603 else if (vss_paused()) {
604 if (mmd->chunks_sent)
605 tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
606 mmd->chunks_sent = 0;
607 } else if (vss_repos()) {
608 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
609 tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
610 mmd->chunks_sent = 0;
611 mmd->current_chunk = mmd->repos_request;
612 mmd->new_vss_status_flags &= ~VSS_REPOS;
613 }
614 if (need_to_request_new_audio_file(vsst)) {
615 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
616 para_fd_set(vsst->afs_socket, &s->wfds, &s->max_fileno);
617 vsst->afsss = AFS_SOCKET_CHECK_FOR_WRITE;
618 } else
619 para_fd_set(vsst->afs_socket, &s->rfds, &s->max_fileno);
620 for (i = 0; senders[i].name; i++) {
621 if (!senders[i].pre_select)
622 continue;
623 senders[i].pre_select(&s->max_fileno, &s->rfds, &s->wfds);
624 }
625 tv = vss_compute_timeout(vsst);
626 if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
627 s->timeout = *tv;
628 }
629
630 static int recv_afs_msg(int afs_socket, int *fd, uint32_t *code, uint32_t *data)
631 {
632 char control[255], buf[8];
633 struct msghdr msg = {.msg_iov = NULL};
634 struct cmsghdr *cmsg;
635 struct iovec iov;
636 int ret = 0;
637
638 *fd = -1;
639 iov.iov_base = buf;
640 iov.iov_len = sizeof(buf);
641 msg.msg_iov = &iov;
642 msg.msg_iovlen = 1;
643 msg.msg_control = control;
644 msg.msg_controllen = sizeof(control);
645 memset(buf, 0, sizeof(buf));
646 ret = recvmsg(afs_socket, &msg, 0);
647 if (ret < 0)
648 return -ERRNO_TO_PARA_ERROR(errno);
649 if (iov.iov_len != sizeof(buf))
650 return -E_AFS_SHORT_READ;
651 *code = *(uint32_t*)buf;
652 *data = *(uint32_t*)(buf + 4);
653 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
654 if (cmsg->cmsg_level != SOL_SOCKET
655 || cmsg->cmsg_type != SCM_RIGHTS)
656 continue;
657 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
658 continue;
659 *fd = *(int *)CMSG_DATA(cmsg);
660 }
661 return 1;
662 }
663
664 static void recv_afs_result(struct vss_task *vsst)
665 {
666 int ret, passed_fd, shmid;
667 uint32_t afs_code = 0, afs_data = 0;
668 struct stat statbuf;
669
670 vsst->afsss = AFS_SOCKET_READY;
671 mmd->afd.afhi.chunk_table = NULL;
672 ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
673 if (ret < 0)
674 goto err;
675 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
676 afs_data);
677 ret = -E_NOFD;
678 if (afs_code != NEXT_AUDIO_FILE)
679 goto err;
680 if (passed_fd < 0)
681 goto err;
682 shmid = afs_data;
683 ret = load_afd(shmid, &mmd->afd);
684 if (ret < 0)
685 goto err;
686 shm_destroy(shmid);
687 ret = fstat(passed_fd, &statbuf);
688 if (ret < 0) {
689 PARA_ERROR_LOG("fstat error:\n");
690 ret = -ERRNO_TO_PARA_ERROR(errno);
691 goto err;
692 }
693 mmd->size = statbuf.st_size;
694 mmd->mtime = statbuf.st_mtime;
695 ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
696 0, &vsst->map);
697 if (ret < 0)
698 goto err;
699 close(passed_fd);
700 mmd->chunks_sent = 0;
701 mmd->current_chunk = 0;
702 mmd->offset = 0;
703 mmd->events++;
704 mmd->num_played++;
705 mmd->new_vss_status_flags &= (~VSS_NEXT);
706 afh_get_header(&mmd->afd.afhi, vsst->map, &vsst->header_buf,
707 &vsst->header_len);
708 return;
709 err:
710 free(mmd->afd.afhi.chunk_table);
711 if (passed_fd >= 0)
712 close(passed_fd);
713 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
714 mmd->new_vss_status_flags = VSS_NEXT;
715 }
716
717 /**
718 * Main sending function.
719 *
720 * This function gets called from vss_post_select(). It checks whether the next
721 * chunk of data should be pushed out. It obtains a pointer to the data to be
722 * sent out as well as its length from mmd->afd.afhi. This information is then
723 * passed to each supported sender's send() function as well as to the send()
724 * functions of each registered fec client.
725 */
726 static void vss_send(struct vss_task *vsst)
727 {
728 int i;
729 struct timeval due;
730 struct fec_client *fc, *tmp_fc;
731
732 if (!vsst->map || !vss_playing())
733 return;
734 if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
735 return;
736 if (chk_barrier("data send", &vsst->data_send_barrier,
737 &due, 1) < 0)
738 return;
739 if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
740 mmd->new_vss_status_flags |= VSS_NEXT;
741 return;
742 }
743 if (!mmd->chunks_sent) {
744 struct timeval tmp;
745 mmd->stream_start = *now;
746 tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &tmp);
747 mmd->offset = tv2ms(&tmp);
748 mmd->events++;
749 }
750 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
751 &mmd->stream_start, &due);
752 if (tv_diff(&due, now, NULL) <= 0) {
753 const char *buf;
754 size_t len;
755 /*
756 * We call the send function also in case of empty chunks as
757 * they might have still some data queued which can be sent in
758 * this case.
759 */
760 afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
761 &buf, &len);
762 for (i = 0; senders[i].name; i++) {
763 if (!senders[i].send)
764 continue;
765 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
766 buf, len, vsst->header_buf, vsst->header_len);
767 }
768 }
769 list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
770 if (!next_slice_is_due(fc, NULL))
771 continue;
772 if (!compute_next_fec_slice(fc, vsst))
773 continue;
774 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc->group.num,
775 fc->slice.num, fc->slice.bytes);
776 fc->fcp->send((char *)fc->enc_buf,
777 fc->slice.bytes + FEC_HEADER_SIZE,
778 fc->fcp->private_data);
779 fc->slice.num++;
780 }
781 mmd->new_vss_status_flags |= VSS_PLAYING;
782 mmd->chunks_sent++;
783 mmd->current_chunk++;
784 }
785
786 static void vss_post_select(struct sched *s, struct task *t)
787 {
788 int ret, i;
789 struct vss_task *vsst = container_of(t, struct vss_task, task);
790
791 if (mmd->sender_cmd_data.cmd_num >= 0) {
792 int num = mmd->sender_cmd_data.cmd_num,
793 sender_num = mmd->sender_cmd_data.sender_num;
794
795 if (senders[sender_num].client_cmds[num])
796 senders[sender_num].client_cmds[num](&mmd->sender_cmd_data);
797 mmd->sender_cmd_data.cmd_num = -1;
798 }
799 if (vsst->afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
800 if (FD_ISSET(vsst->afs_socket, &s->rfds))
801 recv_afs_result(vsst);
802 } else if (FD_ISSET(vsst->afs_socket, &s->wfds)) {
803 PARA_NOTICE_LOG("requesting new fd from afs\n");
804 ret = send_buffer(vsst->afs_socket, "new");
805 vsst->afsss = AFS_SOCKET_AFD_PENDING;
806 }
807 for (i = 0; senders[i].name; i++) {
808 if (!senders[i].post_select)
809 continue;
810 senders[i].post_select(&s->rfds, &s->wfds);
811 }
812 if ((vss_playing() && !(mmd->vss_status_flags & VSS_PLAYING)) ||
813 (vss_next() && vss_playing()))
814 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
815 vss_send(vsst);
816 }
817
818 /**
819 * Initialize the virtual streaming system task.
820 *
821 * \param afs_socket The fd for communication with afs.
822 *
823 * This also initializes all supported senders and starts streaming
824 * if the --autoplay command line flag was given.
825 */
826 void init_vss_task(int afs_socket)
827 {
828 static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
829 int i;
830 char *hn = para_hostname(), *home = para_homedir();
831 long unsigned announce_time = conf.announce_time_arg > 0?
832 conf.announce_time_arg : 300,
833 autoplay_delay = conf.autoplay_delay_arg > 0?
834 conf.autoplay_delay_arg : 0;
835
836 vsst->afs_socket = afs_socket;
837 vsst->task.pre_select = vss_pre_select;
838 vsst->task.post_select = vss_post_select;
839 ms2tv(announce_time, &vsst->announce_tv);
840 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst->announce_tv));
841 for (i = 0; senders[i].name; i++) {
842 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
843 senders[i].init(&senders[i]);
844 }
845 free(hn);
846 free(home);
847 mmd->sender_cmd_data.cmd_num = -1;
848 make_empty_status_items(mmd->afd.verbose_ls_output);
849 if (conf.autoplay_given) {
850 struct timeval tmp;
851 mmd->vss_status_flags |= VSS_PLAYING;
852 mmd->new_vss_status_flags |= VSS_PLAYING;
853 ms2tv(autoplay_delay, &tmp);
854 tv_add(now, &tmp, &vsst->autoplay_barrier);
855 tv_add(&vsst->autoplay_barrier, &vsst->announce_tv,
856 &vsst->data_send_barrier);
857 }
858 INIT_LIST_HEAD(&fec_client_list);
859 register_task(&vsst->task);
860 }