Switch to the new afs.
[paraslash.git] / vss.c
1 /*
2 * Copyright (C) 1997-2007 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 <sys/mman.h> /* mmap */
15 #include <sys/time.h> /* gettimeofday */
16 #include <sys/types.h>
17 #include <dirent.h>
18
19 #include "para.h"
20 #include "error.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 "afs_common.h"
28 #include "vss.h"
29 #include "send.h"
30 #include "ipc.h"
31 #include "fd.h"
32
33 extern const char *status_item_list[];
34
35 static struct timeval announce_tv;
36 static struct timeval data_send_barrier;
37 static struct timeval eof_barrier;
38 static struct timeval autoplay_barrier;
39
40 extern struct misc_meta_data *mmd;
41 extern struct audio_file_selector selectors[];
42 extern struct sender senders[];
43
44 static int audio_file;
45 static char *map;
46
47 /* The mp3 audio format handler does not need any libs. */
48 void mp3_init(struct audio_format_handler *);
49
50 #ifdef HAVE_OGGVORBIS
51 void ogg_init(struct audio_format_handler *);
52 #endif
53 #ifdef HAVE_FAAD
54 void aac_afh_init(struct audio_format_handler *);
55 #endif
56
57 /**
58 * The list of supported audio formats.
59 *
60 * We always define the full array of audio formats even if some audio formats
61 * were not compiled in. This is because for each audio file the number of its
62 * audio format is stored in the databse. We don't want that numbers to become
63 * stale just because the user installed a new version of paraslash that
64 * supports a different set of audio formats.
65 *
66 * It can still be easily detected whether an audio format is compiled in by
67 * checking if the init function pointer is not \p NULL.
68 */
69 static struct audio_format_handler afl[] = {
70 {
71 .name = "mp3",
72 .init = mp3_init,
73 },
74 {
75 .name = "ogg",
76 #ifdef HAVE_OGGVORBIS
77 .init = ogg_init,
78 #endif
79 },
80 {
81 .name = "aac",
82 #ifdef HAVE_FAAD
83 .init = aac_afh_init,
84 #endif
85 },
86 {
87 .name = NULL,
88 }
89 };
90
91 static inline int next_audio_format(int format)
92 {
93 for (;;) {
94 if (!afl[format].name)
95 return format;
96 format++;
97 if (afl[format].init)
98 return format;
99 }
100
101 }
102
103 /** Iterate over each supported audio format. */
104 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i = next_audio_format(i))
105
106
107 /**
108 * check if vss status flag \a P (playing) is set
109 *
110 * \return greater than zero if playing, zero otherwise.
111 *
112 */
113 unsigned int vss_playing(void)
114 {
115 return mmd->new_vss_status_flags & VSS_PLAYING;
116 }
117
118 /**
119 * check if \a N (next) status flag is set
120 *
121 * \return greater than zero if set, zero if not.
122 *
123 */
124 unsigned int vss_next(void)
125 {
126 return mmd->new_vss_status_flags & VSS_NEXT;
127 }
128
129 /**
130 * check if a reposition request is pending
131 *
132 * \return greater than zero if true, zero otherwise.
133 *
134 */
135 unsigned int vss_repos(void)
136 {
137 return mmd->new_vss_status_flags & VSS_REPOS;
138 }
139
140 /**
141 * check if the vss is currently paused
142 *
143 * \return greater than zero if paused, zero otherwise.
144 *
145 */
146 unsigned int vss_paused(void)
147 {
148 return !(mmd->new_vss_status_flags & VSS_NEXT)
149 && !(mmd->new_vss_status_flags & VSS_PLAYING);
150 }
151
152 /**
153 * Get the name of the given audio format.
154 *
155 * \param i The audio format number.
156 *
157 * This returns a pointer to statically allocated memory so it
158 * must not be freed by the caller.
159 */
160 const char *audio_format_name(int i)
161 {
162 //PARA_NOTICE_LOG("array size: %u¸ requested: %d\n", ARRAY_SIZE(afl), i);
163 assert(i < 0 || i < ARRAY_SIZE(afl) - 1);
164 return i >= 0? afl[i].name : "(none)";
165 }
166
167 /**
168 * initialize the virtual streaming system
169 *
170 * Call the init functions of all supported audio format handlers and
171 * initialize all supported senders.
172 */
173 void vss_init(void)
174 {
175 int i;
176 char *hn = para_hostname(), *home = para_homedir();
177 long unsigned announce_time = conf.announce_time_arg > 0?
178 conf.announce_time_arg : 300,
179 autoplay_delay = conf.autoplay_delay_arg > 0?
180 conf.autoplay_delay_arg : 0;
181
182 PARA_DEBUG_LOG("supported audio formats: %s\n",
183 SUPPORTED_AUDIO_FORMATS);
184 FOR_EACH_AUDIO_FORMAT(i) {
185 PARA_NOTICE_LOG("initializing %s handler\n",
186 afl[i].name);
187 afl[i].init(&afl[i]);
188 }
189 ms2tv(announce_time, &announce_tv);
190 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&announce_tv));
191 for (i = 0; senders[i].name; i++) {
192 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
193 senders[i].init(&senders[i]);
194 }
195 free(hn);
196 free(home);
197 if (conf.autoplay_given) {
198 struct timeval now, tmp;
199 mmd->vss_status_flags |= VSS_PLAYING;
200 mmd->new_vss_status_flags |= VSS_PLAYING;
201 gettimeofday(&now, NULL);
202 ms2tv(autoplay_delay, &tmp);
203 tv_add(&now, &tmp, &autoplay_barrier);
204 }
205 }
206
207 static int get_file_info(int i)
208 {
209 return afl[i].get_file_info(map, mmd->size, &mmd->afi);
210 }
211
212 /**
213 * guess the audio format judging from filename
214 *
215 * \param name the filename
216 *
217 * \return This function returns -1 if it has no idea what kind of audio
218 * file this might be. Otherwise the (non-negative) number of the audio format
219 * is returned.
220 */
221 int guess_audio_format(const char *name)
222 {
223 int i,j, len = strlen(name);
224
225 FOR_EACH_AUDIO_FORMAT(i) {
226 for (j = 0; afl[i].suffixes[j]; j++) {
227 const char *p = afl[i].suffixes[j];
228 int plen = strlen(p);
229 if (len < plen + 1)
230 continue;
231 if (name[len - plen - 1] != '.')
232 continue;
233 if (strcasecmp(name + len - plen, p))
234 continue;
235 // PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
236 return i;
237 }
238 }
239 return -E_BAD_AUDIO_FILE_SUFFIX;
240 }
241
242 static int get_audio_format(int omit)
243 {
244 int i;
245
246 FOR_EACH_AUDIO_FORMAT(i) {
247 if (i == omit)
248 continue;
249 if (get_file_info(i) > 0)
250 return i;
251 }
252 return -E_AUDIO_FORMAT;
253 }
254
255 /**
256 * Call get_file_info() to obtain an afhi structure.
257 *
258 * \param path The full path of the audio file.
259 * \param data Pointer to the contents of the (mapped) file.
260 * \param size The file size in bytes.
261 * \param afhi Result pointer.
262 *
263 * \return The number of the audio format on success, \p -E_AUDIO_FORMAT if no
264 * compiled in audio format handler is able to handler the file.
265 *
266 * This function tries to find an audio format handler that can interpret the
267 * file given by \a data and \a size.
268 *
269 * It first tries to determine the audio format from the filename given by \a
270 * path. If this doesn't work, all other audio format handlers are tried until
271 * one is found that can handle the file.
272 */
273 int compute_afhi(const char *path, char *data, size_t size,
274 struct audio_format_info *afhi)
275 {
276 int ret, i, format = guess_audio_format(path);
277
278 if (format >= 0) {
279 ret = afl[format].get_file_info(data, size, afhi);
280 if (ret >= 0)
281 return format;
282 }
283 FOR_EACH_AUDIO_FORMAT(i) {
284 if (i == format) /* we already tried this one to no avail */
285 continue;
286 ret = afl[i].get_file_info(data, size, afhi);
287 if (ret >= 0)
288 return i;
289 PARA_WARNING_LOG("%s\n", PARA_STRERROR(-ret));
290 }
291 return -E_AUDIO_FORMAT;
292 }
293
294 /*
295 * upddate shared mem
296 */
297 static int update_mmd(void)
298 {
299 int i;
300
301 i = guess_audio_format(mmd->filename);
302 if (i < 0 || get_file_info(i) < 0)
303 i = get_audio_format(i);
304 if (i < 0)
305 return i;
306 mmd->audio_format = i;
307 mmd->chunks_sent = 0;
308 mmd->current_chunk = 0;
309 mmd->offset = 0;
310 mmd->events++;
311 return 1;
312 }
313
314 static void vss_get_audio_file(void)
315 {
316 char **sl = selectors[mmd->selector_num].get_audio_file_list(10);
317 int i;
318 struct stat file_status;
319
320 if (!sl)
321 goto err_out;
322 for (i = 0; sl[i]; i++) {
323 struct timeval now;
324 PARA_INFO_LOG("trying %s\n", sl[i]);
325 if (strlen(sl[i]) >= _POSIX_PATH_MAX)
326 continue;
327 audio_file = open(sl[i], O_RDONLY);
328 if (audio_file < 0)
329 continue;
330 if (fstat(audio_file, &file_status) == -1 ||
331 !file_status.st_size) {
332 close(audio_file);
333 continue;
334 }
335 mmd->size = file_status.st_size;
336 mmd->mtime = file_status.st_mtime;
337 map = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE,
338 audio_file, 0);
339 strcpy(mmd->filename, sl[i]);
340 mmd->afi.header_len = 0; /* default: no header */
341 if (update_mmd() < 0) { /* invalid file */
342 close(audio_file);
343 munmap(map, mmd->size);
344 map = NULL;
345 continue;
346 }
347 mmd->num_played++;
348 if (selectors[mmd->selector_num].update_audio_file)
349 selectors[mmd->selector_num].update_audio_file(sl[i]);
350 PARA_NOTICE_LOG("next audio file: %s\n", mmd->filename);
351 mmd->new_vss_status_flags &= (~VSS_NEXT);
352 gettimeofday(&now, NULL);
353 tv_add(&now, &announce_tv, &data_send_barrier);
354 goto free;
355 }
356 err_out:
357 PARA_ERROR_LOG("%s", "no valid files found\n");
358 mmd->new_vss_status_flags = VSS_NEXT;
359 free:
360 if (sl) {
361 for (i = 0; sl[i]; i++)
362 free(sl[i]);
363 free(sl);
364 }
365 }
366
367 static int chk_barrier(const char *bname, const struct timeval *now,
368 const struct timeval *barrier, struct timeval *diff,
369 int print_log)
370 {
371 long ms;
372
373 if (tv_diff(now, barrier, diff) > 0)
374 return 1;
375 ms = tv2ms(diff);
376 if (print_log && ms)
377 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
378 return -1;
379 }
380
381 static void vss_next_chunk_time(struct timeval *due)
382 {
383 struct timeval tmp;
384
385 tv_scale(mmd->chunks_sent, &mmd->afi.chunk_tv, &tmp);
386 tv_add(&tmp, &mmd->stream_start, due);
387 }
388
389 /*
390 * != NULL: timeout for next chunk
391 * NULL: nothing to do
392 */
393 static struct timeval *vss_compute_timeout(void)
394 {
395 static struct timeval the_timeout;
396 struct timeval now, next_chunk;
397
398 if (vss_next() && mmd->audio_format >= 0) {
399 /* only sleep a bit, nec*/
400 the_timeout.tv_sec = 0;
401 the_timeout.tv_usec = 100;
402 return &the_timeout;
403 }
404 gettimeofday(&now, NULL);
405 if (chk_barrier("autoplay_delay", &now, &autoplay_barrier,
406 &the_timeout, 1) < 0)
407 return &the_timeout;
408 if (chk_barrier("eof", &now, &eof_barrier, &the_timeout, 1) < 0)
409 return &the_timeout;
410 if (chk_barrier("data send", &now, &data_send_barrier,
411 &the_timeout, 1) < 0)
412 return &the_timeout;
413 if (mmd->audio_format < 0 || !vss_playing() || !map)
414 return NULL;
415 vss_next_chunk_time(&next_chunk);
416 if (chk_barrier(afl[mmd->audio_format].name, &now, &next_chunk,
417 &the_timeout, 0) < 0)
418 return &the_timeout;
419 /* chunk is due or bof */
420 the_timeout.tv_sec = 0;
421 the_timeout.tv_usec = 0;
422 return &the_timeout;
423 }
424
425 static void vss_eof(void)
426 {
427 struct timeval now;
428 int i;
429 char *tmp;
430
431 if (!map) {
432 for (i = 0; senders[i].name; i++)
433 senders[i].shutdown_clients();
434 return;
435 }
436 gettimeofday(&now, NULL);
437 tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
438 munmap(map, mmd->size);
439 map = NULL;
440 close(audio_file);
441 mmd->audio_format = -1;
442 mmd->chunks_sent = 0;
443 mmd->offset = 0;
444 mmd->afi.seconds_total = 0;
445 free(mmd->afi.chunk_table);
446 mmd->afi.chunk_table = NULL;
447 tmp = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_INFO1],
448 status_item_list[SI_AUDIO_INFO2], status_item_list[SI_AUDIO_INFO3]);
449 strcpy(mmd->afi.info_string, tmp);
450 free(tmp);
451 tmp = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_DBINFO1],
452 status_item_list[SI_DBINFO2], status_item_list[SI_DBINFO3]);
453 strcpy(mmd->selector_info, tmp);
454 free(tmp);
455 mmd->filename[0] = '\0';
456 mmd->size = 0;
457 mmd->events++;
458 }
459
460 /**
461 * Get the header of the current audio file.
462 *
463 * \param header_len the length of the header is stored here
464 *
465 * \return a pointer to a buffer containing the header, or NULL, if no audio
466 * file is selected or if the current audio format does not need special header
467 * treamtment.
468 *
469 */
470 char *vss_get_header(size_t *header_len)
471 {
472 if (mmd->audio_format < 0 || !map || !mmd->afi.header_len)
473 return NULL;
474 *header_len = mmd->afi.header_len;
475 return map + mmd->afi.header_offset;
476 }
477
478 /**
479 * get the list of all supported audio formats
480 *
481 * \return a space separated list of all supported audio formats
482 * It is not allocated at runtime, i.e. there is no need to free
483 * the returned string in the caller.
484 */
485 const char *supported_audio_formats(void)
486 {
487 return SUPPORTED_AUDIO_FORMATS;
488 }
489
490 /**
491 * get the chunk time of the current audio file
492 *
493 * \return a pointer to a struct containing the chunk time, or NULL,
494 * if currently no audio file is selected.
495 */
496 struct timeval *vss_chunk_time(void)
497 {
498 if (mmd->audio_format < 0)
499 return NULL;
500 return &mmd->afi.chunk_tv;
501 }
502
503 enum afs_socket_status {
504 AFS_SOCKET_READY,
505 AFS_SOCKET_CHECK_FOR_WRITE,
506 AFS_SOCKET_AFD_PENDING
507 };
508
509 static enum afs_socket_status afsss;
510
511 /**
512 * compute the timeout for para_server's main select-loop
513 *
514 * This function gets called from para_server to determine the timeout value
515 * for its main select loop.
516 *
517 * Before the timeout is computed, the current vss status flags are evaluated
518 * and acted upon by calling appropriate functions from the lower layers.
519 * Possible actions include
520 *
521 * - request a new file list from the current audio file selector
522 * - shutdown of all senders (stop/pause command)
523 * - reposition the stream (ff/jmp command)
524 *
525 * \return A pointer to a struct timeval containing the timeout for the next
526 * chunk of data to be sent, or NULL if we're not sending right now.
527 */
528 struct timeval *vss_preselect(fd_set *rfds, fd_set *wfds, int *max_fileno)
529 {
530 struct audio_format_handler *af = NULL;
531 int i, format;
532 struct timeval *ret;
533
534 para_fd_set(afs_socket, rfds, max_fileno);
535
536 //again:
537 format = mmd->audio_format;
538 if (format >= 0)
539 af = afl + format;
540 else
541 for (i = 0; senders[i].name; i++)
542 senders[i].shutdown_clients();
543 if (vss_next() && af) {
544 vss_eof();
545 return vss_compute_timeout();
546 }
547 if (vss_paused() || vss_repos()) {
548 for (i = 0; senders[i].name; i++)
549 senders[i].shutdown_clients();
550 if (af) {
551 struct timeval now;
552 gettimeofday(&now, NULL);
553 if (!vss_paused() || mmd->chunks_sent)
554 tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
555 if (vss_repos())
556 tv_add(&now, &announce_tv, &data_send_barrier);
557 if (mmd->new_vss_status_flags & VSS_NOMORE)
558 mmd->new_vss_status_flags = VSS_NEXT;
559 }
560 mmd->chunks_sent = 0;
561 }
562 if (vss_repos()) {
563 mmd->new_vss_status_flags &= ~(VSS_REPOS);
564 mmd->current_chunk = mmd->repos_request;
565 }
566 ret = vss_compute_timeout();
567 if (!ret && !map && vss_playing() &&
568 !(mmd->new_vss_status_flags & VSS_NOMORE)) {
569 PARA_DEBUG_LOG("%s", "ready and playing, but no audio file\n");
570 //vss_get_audio_file();
571 if (afsss == AFS_SOCKET_READY) {
572 para_fd_set(afs_socket, wfds, max_fileno);
573 afsss = AFS_SOCKET_CHECK_FOR_WRITE;
574 }
575 // goto again;
576 }
577 return ret;
578 }
579
580 static int recv_afs_msg(int *fd, uint32_t *code, uint32_t *data)
581 {
582 char control[255], buf[8];
583 struct msghdr msg = {.msg_iov = NULL};
584 struct cmsghdr *cmsg;
585 struct iovec iov;
586 int ret = 0;
587
588 iov.iov_base = buf;
589 iov.iov_len = sizeof(buf);
590 msg.msg_iov = &iov;
591 msg.msg_iovlen = 1;
592 msg.msg_control = control;
593 msg.msg_controllen = sizeof(control);
594 memset(buf, 0, sizeof(buf));
595 ret = recvmsg(afs_socket, &msg, 0);
596 if (ret < 0)
597 return -ERRNO_TO_PARA_ERROR(errno);
598 if (iov.iov_len != sizeof(buf))
599 return -E_SHORT_AFS_READ;
600 *code = *(uint32_t*)buf;
601 *data = *(uint32_t*)(buf + 4);
602 cmsg = CMSG_FIRSTHDR(&msg);
603 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
604 if (cmsg->cmsg_level != SOL_SOCKET
605 || cmsg->cmsg_type != SCM_RIGHTS)
606 continue;
607 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
608 continue;
609 *fd = *(int *)CMSG_DATA(cmsg);
610 }
611 return 1;
612 }
613
614 static void recv_afs_result(void)
615 {
616 int ret, passed_fd = -1, shmid;
617 uint32_t afs_code = 0, afs_data = 0;
618 struct stat statbuf;
619 struct timeval now;
620
621 ret = recv_afs_msg(&passed_fd, &afs_code, &afs_data);
622 if (ret < 0)
623 goto err;
624 PARA_NOTICE_LOG("got the fd: %d, code: %u, shmid: %u\n",
625 passed_fd, afs_code, afs_data);
626 ret = -E_BAD_AFS_CODE;
627 if (afs_code != NEXT_AUDIO_FILE)
628 goto err;
629 afsss = AFS_SOCKET_READY;
630 shmid = afs_data;
631 ret = load_afd(shmid, &mmd->afd);
632 if (ret < 0)
633 goto err;
634 shm_destroy(shmid);
635 PARA_NOTICE_LOG("next audio file: %s (%lu chunks)\n", mmd->afd.path,
636 mmd->afd.afhi.chunks_total);
637 ret = fstat(passed_fd, &statbuf);
638 if (ret < 0) {
639 ret = -ERRNO_TO_PARA_ERROR(errno);
640 goto err;
641 }
642 mmd->size = statbuf.st_size;
643 mmd->mtime = statbuf.st_mtime;
644 map = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE,
645 passed_fd, 0);
646 strcpy(mmd->filename, mmd->afd.path); /* FIXME: check length */
647 mmd->afi.header_len = 0; /* default: no header */
648 mmd->audio_format = mmd->afd.afsi.audio_format_id;
649 mmd->chunks_sent = 0;
650 mmd->current_chunk = 0;
651 mmd->offset = 0;
652 mmd->events++;
653 mmd->num_played++;
654 mmd->afi = mmd->afd.afhi;
655 mmd->new_vss_status_flags &= (~VSS_NEXT);
656 gettimeofday(&now, NULL);
657 tv_add(&now, &announce_tv, &data_send_barrier);
658 return;
659 err:
660 if (passed_fd >= 0)
661 close(passed_fd);
662 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
663 }
664
665 void vss_post_select(fd_set *rfds, fd_set *wfds)
666 {
667 int ret;
668
669 if (FD_ISSET(afs_socket, rfds))
670 recv_afs_result();
671 if (afsss != AFS_SOCKET_CHECK_FOR_WRITE || !FD_ISSET(afs_socket, wfds))
672 return;
673 ret = send_buffer(afs_socket, "new");
674 afsss = AFS_SOCKET_AFD_PENDING;
675 }
676
677 static void get_chunk(long unsigned chunk_num, char **buf, size_t *len)
678 {
679 size_t pos = mmd->afi.chunk_table[chunk_num];
680 *buf = map + pos;
681 *len = mmd->afi.chunk_table[chunk_num + 1] - pos;
682 }
683
684 /**
685 * Get the data of the given chunk.
686 *
687 * \param chunk_num The number of the desired chunk.
688 * \param buf Chunk data.
689 * \param len Chunk length in bytes.
690 *
691 * \return Positive on success, negative on errors.
692 */
693 int vss_get_chunk(long unsigned chunk_num, char **buf, size_t *len)
694 {
695 if (mmd->audio_format < 0 || !map || !vss_playing())
696 return -E_CHUNK;
697 if (chunk_num >= mmd->afi.chunks_total)
698 return -E_CHUNK;
699 get_chunk(chunk_num, buf, len);
700 return 1;
701 }
702
703 /**
704 * main sending function
705 *
706 * This function gets called from para_server as soon as the next chunk of
707 * data should be pushed out. It first calls the read_chunk() function of
708 * the current audio format handler to obtain a pointer to the data to be
709 * sent out as well as its length. This information is then passed to each
710 * supported sender's send() function which does the actual sending.
711 */
712 void vss_send_chunk(void)
713 {
714 int i;
715 struct audio_format_handler *af;
716 struct timeval now, due;
717
718 if (mmd->audio_format < 0 || !map || !vss_playing())
719 return;
720 af = &afl[mmd->audio_format];
721 gettimeofday(&now, NULL);
722 vss_next_chunk_time(&due);
723 if (tv_diff(&due, &now, NULL) > 0)
724 return;
725 if (chk_barrier("eof", &now, &eof_barrier, &due, 1) < 0)
726 return;
727 if (chk_barrier("data send", &now, &data_send_barrier,
728 &due, 1) < 0)
729 return;
730 mmd->new_vss_status_flags &= ~VSS_REPOS;
731 if (mmd->current_chunk >= mmd->afi.chunks_total) { /* eof */
732 mmd->new_vss_status_flags |= VSS_NEXT;
733 return vss_eof();
734 }
735 /*
736 * We call the send function also in case of empty chunks as they
737 * might have still some data queued which can be sent in this case.
738 */
739 if (!mmd->chunks_sent) {
740 struct timeval tmp;
741 gettimeofday(&mmd->stream_start, NULL);
742 tv_scale(mmd->current_chunk, &mmd->afi.chunk_tv, &tmp);
743 mmd->offset = tv2ms(&tmp);
744 mmd->events++;
745 }
746 for (i = 0; senders[i].name; i++) {
747 char *buf;
748 size_t len;
749 get_chunk(mmd->current_chunk, &buf, &len);
750 senders[i].send(mmd->current_chunk, mmd->chunks_sent, buf, len);
751 }
752 mmd->new_vss_status_flags |= VSS_PLAYING;
753 mmd->chunks_sent++;
754 mmd->current_chunk++;
755 }