2 * Copyright (C) 1997-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file vss.c The virtual streaming system.
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
18 #include "portable_io.h"
25 #include "server.cmdline.h"
33 extern struct misc_meta_data *mmd;
35 extern void dccp_send_init(struct sender *);
36 extern void http_send_init(struct sender *);
37 extern void udp_send_init(struct sender *);
39 /** The list of supported senders. */
40 struct sender senders[] = {
43 .init = http_send_init,
47 .init = dccp_send_init,
51 .init = udp_send_init,
58 /** The possible states of the afs socket. */
59 enum afs_socket_status {
60 /** Socket is inactive. */
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
68 /** The task structure for the virtual streaming system. */
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. */
80 /** The current state of \a afs_socket. */
81 enum afs_socket_status afsss;
82 /** The memory mapped audio file. */
84 /** Used by the scheduler. */
86 /** Pointer to the header of the mapped audio file. */
87 const char *header_buf;
88 /** Length of the audio file header. */
90 /** Time between audio file headers are sent. */
91 struct timeval header_interval;
95 * The list of currently connected fec clients.
97 * Senders may use \ref vss_add_fec_client() to add entries to the list.
99 static struct list_head fec_client_list;
102 * Data associated with one FEC group.
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.
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.
114 /** The number of the FEC group. */
116 /** Number of bytes in this group. */
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. */
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 unsigned num_header_slices;
131 * Describes one connected FEC client.
134 /** Parameters requested by the client. */
135 struct fec_client_parms *fcp;
136 /** Used by the core FEC code. */
137 struct fec_parms *parms;
138 /** The position of this client in the fec client list. */
139 struct list_head node;
140 /** When the first slice for this client was sent. */
141 struct timeval stream_start;
142 /** The first chunk sent to this FEC client. */
143 int first_stream_chunk;
144 /** Describes the current group. */
145 struct fec_group group;
146 /** The current slice. */
147 uint8_t current_slice_num;
148 /** The data to be FEC-encoded (point to a region within the mapped audio file). */
149 const unsigned char **src_data;
150 /** Last time an audio header was sent. */
151 struct timeval next_header_time;
152 /** Used for the last source pointer of an audio file. */
153 unsigned char *extra_src_buf;
154 /** Extra slices needed to store largest chunk + header. */
155 int num_extra_slices;
156 /** Contains the FEC-encoded data. */
157 unsigned char *enc_buf;
161 * Get the chunk time of the current audio file.
163 * \return A pointer to a struct containing the chunk time, or NULL,
164 * if currently no audio file is selected.
166 struct timeval *vss_chunk_time(void)
168 if (mmd->afd.afhi.chunk_tv.tv_sec == 0 &&
169 mmd->afd.afhi.chunk_tv.tv_usec == 0)
171 return &mmd->afd.afhi.chunk_tv;
175 * Write a fec header to a buffer.
177 * \param buf The buffer to write to.
178 * \param h The fec header to write.
180 static void write_fec_header(struct fec_client *fc, struct vss_task *vsst)
182 char *buf = (char *)fc->enc_buf;
183 struct fec_group *g = &fc->group;
184 struct fec_client_parms *p = fc->fcp;
186 write_u32(buf, FEC_MAGIC);
188 write_u8(buf + 4, p->slices_per_group + fc->num_extra_slices);
189 write_u8(buf + 5, p->data_slices_per_group + fc->num_extra_slices);
190 write_u32(buf + 6, g->num_header_slices? vsst->header_len : 0);
192 write_u32(buf + 10, g->num);
193 write_u32(buf + 14, g->bytes);
195 write_u8(buf + 18, fc->current_slice_num);
196 write_u16(buf + 20, p->max_slice_bytes - FEC_HEADER_SIZE);
197 write_u8(buf + 22, g->first_chunk? 0 : 1);
198 write_u8(buf + 23, vsst->header_len? 1 : 0);
199 memset(buf + 24, 0, 7);
202 static int need_audio_header(struct fec_client *fc, struct vss_task *vsst)
204 if (!mmd->current_chunk) {
205 tv_add(now, &vsst->header_interval, &fc->next_header_time);
208 if (!vsst->header_buf)
210 if (!vsst->header_len)
212 if (fc->group.num && tv_diff(&fc->next_header_time, now, NULL) > 0)
214 tv_add(now, &vsst->header_interval, &fc->next_header_time);
218 static uint8_t num_slices(long unsigned bytes, struct fec_client *fc)
220 uint16_t m = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
221 return (bytes + m - 1) / m;
224 static int setup_next_fec_group(struct fec_client *fc, struct vss_task *vsst)
226 int i, k, data_slices;
228 const char *buf, *start_buf;
229 struct timeval tmp, *chunk_tv = vss_chunk_time();
230 struct fec_group *g = &fc->group;
231 unsigned slice_bytes = fc->fcp->max_slice_bytes - FEC_HEADER_SIZE;
232 uint32_t max_data_size;
235 k = fc->fcp->data_slices_per_group + fc->num_extra_slices;
236 if (fc->first_stream_chunk < 0) {
237 uint32_t largest = afh_get_largest_chunk_size(&mmd->afd.afhi)
239 uint8_t needed = num_slices(largest, fc), want;
240 if (needed > fc->fcp->data_slices_per_group)
241 PARA_WARNING_LOG("fec parms insufficient for this audio file\n");
242 want = PARA_MAX(needed, fc->fcp->data_slices_per_group);
246 fc->src_data = para_realloc(fc->src_data, want * sizeof(char *));
247 ret = fec_new(want, want + fc->fcp->slices_per_group
248 - fc->fcp->data_slices_per_group, &fc->parms);
252 fc->num_extra_slices = 0;
253 if (k > fc->fcp->data_slices_per_group) {
254 fc->num_extra_slices = k - fc->fcp->data_slices_per_group;
255 PARA_NOTICE_LOG("using %d extra slices\n",
256 fc->num_extra_slices);
259 fc->stream_start = *now;
260 fc->first_stream_chunk = mmd->current_chunk;
261 g->first_chunk = mmd->current_chunk;
264 g->first_chunk += g->num_chunks;
267 if (g->first_chunk >= mmd->afd.afhi.chunks_total)
269 if (need_audio_header(fc, vsst))
270 g->num_header_slices = num_slices(vsst->header_len, fc);
272 g->num_header_slices = 0;
273 afh_get_chunk(g->first_chunk, &mmd->afd.afhi, vsst->map, &start_buf,
275 data_slices = k - g->num_header_slices;
277 max_data_size = slice_bytes * data_slices;
279 for (i = g->first_chunk; i < mmd->afd.afhi.chunks_total; i++) {
280 afh_get_chunk(i, &mmd->afd.afhi, vsst->map, &buf, &len);
281 if (g->bytes + len > max_data_size)
285 g->num_chunks = i - g->first_chunk;
286 assert(g->num_chunks);
287 fc->current_slice_num = 0;
289 /* setup header slices */
290 buf = vsst->header_buf;
291 for (i = 0; i < g->num_header_slices; i++) {
292 fc->src_data[i] = (const unsigned char *)buf;
296 /* setup data slices */
298 for (i = g->num_header_slices; i < k; i++) {
299 if (buf + slice_bytes > vsst->map + mmd->size)
301 * Can not use the memory mapped audio file for this
302 * slice as it goes beyond the map. This slice will not
306 fc->src_data[i] = (const unsigned char *)buf;
310 uint32_t payload_size = vsst->map + mmd->size - buf;
311 memcpy(fc->extra_src_buf, buf, payload_size);
312 fc->src_data[i] = fc->extra_src_buf;
314 /* use arbitrary data for all remaining slices */
317 fc->src_data[i] = (const unsigned char *)buf;
320 /* setup group timing */
321 tv_scale(g->first_chunk - fc->first_stream_chunk, chunk_tv, &tmp);
322 tv_add(&fc->stream_start, &tmp, &g->start);
323 if (g->num) /* quick hack to avoid buffer underruns */
325 tv_scale(g->num_chunks, chunk_tv, &tmp); /* group duration */
326 tv_divide(fc->fcp->slices_per_group + fc->num_extra_slices,
327 &tmp, &g->slice_duration);
329 PARA_DEBUG_LOG("FEC group %d: %d chunks (%d - %d), %d header slices, %d data slices\n",
330 g->num, g->num_chunks, g->first_chunk,
331 g->first_chunk + g->num_chunks - 1,
332 g->num_header_slices, data_slices
334 PARA_DEBUG_LOG("durations (group/chunk/slice): %lu/%lu/%lu\n",
335 tv2ms(&tmp), tv2ms(chunk_tv), tv2ms(&g->slice_duration));
339 static int compute_next_fec_slice(struct fec_client *fc, struct vss_task *vsst)
341 if (fc->first_stream_chunk < 0 || fc->current_slice_num
342 == fc->fcp->slices_per_group + fc->num_extra_slices) {
343 int ret = setup_next_fec_group(fc, vsst);
347 write_fec_header(fc, vsst);
348 fec_encode(fc->parms, fc->src_data, fc->enc_buf + FEC_HEADER_SIZE,
349 fc->current_slice_num,
350 fc->fcp->max_slice_bytes - FEC_HEADER_SIZE);
355 * Return a buffer that marks the end of the stream.
357 * \param buf Result pointer.
358 * \return The length of the eof buffer.
360 * This is used for (multicast) udp streaming where closing the socket on the
361 * sender might not give rise to an eof condition at the peer.
363 size_t vss_get_fec_eof_packet(const char **buf)
365 static const char fec_eof_packet[FEC_HEADER_SIZE] = FEC_EOF_PACKET;
366 *buf = fec_eof_packet;
367 return FEC_HEADER_SIZE;
371 * Add one entry to the list of active fec clients.
373 * \param fcp Describes the fec parameters to be used for this client.
374 * \param result An opaque pointer that must be used by remove the client later.
378 int vss_add_fec_client(struct fec_client_parms *fcp, struct fec_client **result)
381 struct fec_client *fc;
383 if (fcp->max_slice_bytes < FEC_HEADER_SIZE + fcp->data_slices_per_group)
384 return -ERRNO_TO_PARA_ERROR(EINVAL);
385 fc = para_calloc(sizeof(*fc));
387 ret = fec_new(fcp->data_slices_per_group, fcp->slices_per_group,
391 fc->first_stream_chunk = -1; /* stream not yet started */
392 fc->src_data = para_malloc(fc->fcp->slices_per_group * sizeof(char *));
393 fc->enc_buf = para_calloc(fc->fcp->max_slice_bytes);
394 fc->num_extra_slices = 0;
395 fc->extra_src_buf = para_calloc(fc->fcp->max_slice_bytes);
396 fc->next_header_time.tv_sec = 0;
397 para_list_add(&fc->node, &fec_client_list);
408 * Remove one entry from the list of active fec clients.
410 * \param fc The client to be removed.
412 void vss_del_fec_client(struct fec_client *fc)
417 free(fc->extra_src_buf);
423 * Compute if/when next slice is due. If it isn't due yet and \a diff is
424 * not \p Null, compute the time difference next - now, where
426 * next = stream_start + (first_group_chunk - first_stream_chunk)
427 * * chunk_time + slice_num * slice_time
429 static int next_slice_is_due(struct fec_client *fc, struct timeval *diff)
431 struct timeval tmp, next;
434 if (fc->first_stream_chunk < 0)
436 tv_scale(fc->current_slice_num, &fc->group.slice_duration, &tmp);
437 tv_add(&tmp, &fc->group.start, &next);
438 ret = tv_diff(&next, now, diff);
439 return ret < 0? 1 : 0;
442 static void compute_slice_timeout(struct timeval *timeout)
444 struct fec_client *fc;
446 assert(vss_playing());
447 list_for_each_entry(fc, &fec_client_list, node) {
450 if (next_slice_is_due(fc, &diff)) {
452 timeout->tv_usec = 0;
455 /* timeout = min(timeout, diff) */
456 if (tv_diff(&diff, timeout, NULL) < 0)
462 * Check if vss status flag \a P (playing) is set.
464 * \return Greater than zero if playing, zero otherwise.
467 unsigned int vss_playing(void)
469 return mmd->new_vss_status_flags & VSS_PLAYING;
473 * Check if the \a N (next) status flag is set.
475 * \return Greater than zero if set, zero if not.
478 unsigned int vss_next(void)
480 return mmd->new_vss_status_flags & VSS_NEXT;
484 * Check if a reposition request is pending.
486 * \return Greater than zero if true, zero otherwise.
489 unsigned int vss_repos(void)
491 return mmd->new_vss_status_flags & VSS_REPOS;
495 * Check if the vss is currently paused.
497 * \return Greater than zero if paused, zero otherwise.
500 unsigned int vss_paused(void)
502 return !(mmd->new_vss_status_flags & VSS_NEXT)
503 && !(mmd->new_vss_status_flags & VSS_PLAYING);
507 * Check if the vss is currently stopped.
509 * \return Greater than zero if paused, zero otherwise.
512 unsigned int vss_stopped(void)
514 return (mmd->new_vss_status_flags & VSS_NEXT)
515 && !(mmd->new_vss_status_flags & VSS_PLAYING);
518 static int chk_barrier(const char *bname, const struct timeval *barrier,
519 struct timeval *diff, int print_log)
523 if (tv_diff(now, barrier, diff) > 0)
527 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
532 * != NULL: timeout for next chunk
533 * NULL: nothing to do
535 static struct timeval *vss_compute_timeout(struct vss_task *vsst)
537 static struct timeval the_timeout;
538 struct timeval next_chunk;
540 if (vss_next() && vsst->map) {
541 /* only sleep a bit, nec*/
542 the_timeout.tv_sec = 0;
543 the_timeout.tv_usec = 100;
546 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
547 &the_timeout, 1) < 0)
549 if (chk_barrier("eof", &vsst->eof_barrier, &the_timeout, 1) < 0)
551 if (chk_barrier("data send", &vsst->data_send_barrier,
552 &the_timeout, 1) < 0)
554 if (!vss_playing() || !vsst->map)
556 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
557 &mmd->stream_start, &next_chunk);
558 if (chk_barrier("chunk", &next_chunk, &the_timeout, 0) >= 0) {
559 /* chunk is due or bof */
560 the_timeout.tv_sec = 0;
561 the_timeout.tv_usec = 0;
564 /* compute min of current timeout and next slice time */
565 compute_slice_timeout(&the_timeout);
569 static void vss_eof(struct vss_task *vsst)
572 mmd->stream_start = *now;
575 if (mmd->new_vss_status_flags & VSS_NOMORE)
576 mmd->new_vss_status_flags = VSS_NEXT;
577 tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
578 para_munmap(vsst->map, mmd->size);
580 mmd->chunks_sent = 0;
582 mmd->afd.afhi.seconds_total = 0;
583 mmd->afd.afhi.chunk_tv.tv_sec = 0;
584 mmd->afd.afhi.chunk_tv.tv_usec = 0;
585 free(mmd->afd.afhi.chunk_table);
586 mmd->afd.afhi.chunk_table = NULL;
587 free(mmd->afd.afhi.info_string);
588 mmd->afd.afhi.info_string = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_FILE_INFO],
589 status_item_list[SI_TAGINFO1], status_item_list[SI_TAGINFO2]);
590 make_empty_status_items(mmd->afd.verbose_ls_output);
597 * Get the list of all supported audio formats.
599 * \return Aa space separated list of all supported audio formats
600 * It is not allocated at runtime, i.e. there is no need to free
601 * the returned string in the caller.
603 const char *supported_audio_formats(void)
605 return SUPPORTED_AUDIO_FORMATS;
608 static int need_to_request_new_audio_file(struct vss_task *vsst)
612 if (vsst->map) /* have audio file */
614 if (!vss_playing()) /* don't need one */
616 if (mmd->new_vss_status_flags & VSS_NOMORE)
618 if (vsst->afsss == AFS_SOCKET_AFD_PENDING) /* already requested one */
620 if (chk_barrier("autoplay_delay", &vsst->autoplay_barrier,
627 * Compute the timeout for para_server's main select-loop.
629 * This function gets called from para_server to determine the timeout value
630 * for its main select loop.
632 * \param s Pointer to the server scheduler.
633 * \param t Pointer to the vss task structure.
635 * Before the timeout is computed, the current vss status flags are evaluated
636 * and acted upon by calling appropriate functions from the lower layers.
637 * Possible actions include
639 * - request a new audio file from afs,
640 * - shutdown of all senders (stop/pause command),
641 * - reposition the stream (ff/jmp command).
643 static void vss_pre_select(struct sched *s, struct task *t)
646 struct timeval *tv, diff;
647 struct vss_task *vsst = container_of(t, struct vss_task, task);
649 if (!vsst->map || vss_next() || vss_paused() || vss_repos()) {
650 struct fec_client *fc, *tmp;
651 for (i = 0; senders[i].name; i++)
652 if (senders[i].shutdown_clients)
653 senders[i].shutdown_clients();
654 list_for_each_entry_safe(fc, tmp, &fec_client_list, node)
655 fc->first_stream_chunk = -1;
659 else if (vss_paused()) {
660 if (mmd->chunks_sent)
661 tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
662 mmd->chunks_sent = 0;
663 } else if (vss_repos()) {
664 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
665 tv_add(&mmd->afd.afhi.eof_tv, now, &vsst->eof_barrier);
666 mmd->chunks_sent = 0;
667 mmd->current_chunk = mmd->repos_request;
668 mmd->new_vss_status_flags &= ~VSS_REPOS;
670 if (need_to_request_new_audio_file(vsst)) {
671 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
672 para_fd_set(vsst->afs_socket, &s->wfds, &s->max_fileno);
673 vsst->afsss = AFS_SOCKET_CHECK_FOR_WRITE;
675 para_fd_set(vsst->afs_socket, &s->rfds, &s->max_fileno);
676 for (i = 0; senders[i].name; i++) {
677 if (!senders[i].pre_select)
679 senders[i].pre_select(&s->max_fileno, &s->rfds, &s->wfds);
681 tv = vss_compute_timeout(vsst);
682 if (tv && tv_diff(tv, &s->timeout, &diff) < 0)
686 static int recv_afs_msg(int afs_socket, int *fd, uint32_t *code, uint32_t *data)
688 char control[255], buf[8];
689 struct msghdr msg = {.msg_iov = NULL};
690 struct cmsghdr *cmsg;
696 iov.iov_len = sizeof(buf);
699 msg.msg_control = control;
700 msg.msg_controllen = sizeof(control);
701 memset(buf, 0, sizeof(buf));
702 ret = recvmsg(afs_socket, &msg, 0);
704 return -ERRNO_TO_PARA_ERROR(errno);
705 if (iov.iov_len != sizeof(buf))
706 return -E_AFS_SHORT_READ;
707 *code = *(uint32_t*)buf;
708 *data = *(uint32_t*)(buf + 4);
709 for (cmsg = CMSG_FIRSTHDR(&msg); cmsg; cmsg = CMSG_NXTHDR(&msg, cmsg)) {
710 if (cmsg->cmsg_level != SOL_SOCKET
711 || cmsg->cmsg_type != SCM_RIGHTS)
713 if ((cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int) != 1)
715 *fd = *(int *)CMSG_DATA(cmsg);
720 static void recv_afs_result(struct vss_task *vsst)
722 int ret, passed_fd, shmid;
723 uint32_t afs_code = 0, afs_data = 0;
726 vsst->afsss = AFS_SOCKET_READY;
727 mmd->afd.afhi.chunk_table = NULL;
728 ret = recv_afs_msg(vsst->afs_socket, &passed_fd, &afs_code, &afs_data);
731 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd, afs_code,
734 if (afs_code != NEXT_AUDIO_FILE)
739 ret = load_afd(shmid, &mmd->afd);
743 ret = fstat(passed_fd, &statbuf);
745 PARA_ERROR_LOG("fstat error:\n");
746 ret = -ERRNO_TO_PARA_ERROR(errno);
749 mmd->size = statbuf.st_size;
750 mmd->mtime = statbuf.st_mtime;
751 ret = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE, passed_fd,
756 mmd->chunks_sent = 0;
757 mmd->current_chunk = 0;
761 mmd->new_vss_status_flags &= (~VSS_NEXT);
762 afh_get_header(&mmd->afd.afhi, vsst->map, &vsst->header_buf,
766 free(mmd->afd.afhi.chunk_table);
769 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
770 mmd->new_vss_status_flags = VSS_NEXT;
774 * Main sending function.
776 * This function gets called from vss_post_select(). It checks whether the next
777 * chunk of data should be pushed out. It obtains a pointer to the data to be
778 * sent out as well as its length from mmd->afd.afhi. This information is then
779 * passed to each supported sender's send() function as well as to the send()
780 * functions of each registered fec client.
782 static void vss_send(struct vss_task *vsst)
784 int i, sent_something = 0;
786 struct fec_client *fc, *tmp_fc;
788 if (!vsst->map || !vss_playing())
790 if (chk_barrier("eof", &vsst->eof_barrier, &due, 1) < 0)
792 if (chk_barrier("data send", &vsst->data_send_barrier,
795 list_for_each_entry_safe(fc, tmp_fc, &fec_client_list, node) {
796 if (!next_slice_is_due(fc, NULL))
798 if (compute_next_fec_slice(fc, vsst) <= 0)
800 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc->group.num,
801 fc->current_slice_num, fc->fcp->max_slice_bytes);
802 fc->fcp->send((char *)fc->enc_buf,
803 fc->fcp->max_slice_bytes,
804 fc->fcp->private_data);
805 fc->current_slice_num++;
808 if (mmd->current_chunk >= mmd->afd.afhi.chunks_total) { /* eof */
810 mmd->new_vss_status_flags |= VSS_NEXT;
813 compute_chunk_time(mmd->chunks_sent, &mmd->afd.afhi.chunk_tv,
814 &mmd->stream_start, &due);
815 if (tv_diff(&due, now, NULL) <= 0) {
819 if (!mmd->chunks_sent) {
821 mmd->stream_start = *now;
822 tv_scale(mmd->current_chunk, &mmd->afd.afhi.chunk_tv, &tmp);
823 mmd->offset = tv2ms(&tmp);
827 * We call the send function also in case of empty chunks as
828 * they might have still some data queued which can be sent in
831 afh_get_chunk(mmd->current_chunk, &mmd->afd.afhi, vsst->map,
833 for (i = 0; senders[i].name; i++) {
834 if (!senders[i].send)
836 senders[i].send(mmd->current_chunk, mmd->chunks_sent,
837 buf, len, vsst->header_buf, vsst->header_len);
840 mmd->current_chunk++;
844 static void vss_post_select(struct sched *s, struct task *t)
847 struct vss_task *vsst = container_of(t, struct vss_task, task);
850 if (mmd->sender_cmd_data.cmd_num >= 0) {
851 int num = mmd->sender_cmd_data.cmd_num,
852 sender_num = mmd->sender_cmd_data.sender_num;
854 if (senders[sender_num].client_cmds[num])
855 senders[sender_num].client_cmds[num](&mmd->sender_cmd_data);
856 mmd->sender_cmd_data.cmd_num = -1;
858 if (vsst->afsss != AFS_SOCKET_CHECK_FOR_WRITE) {
859 if (FD_ISSET(vsst->afs_socket, &s->rfds))
860 recv_afs_result(vsst);
861 } else if (FD_ISSET(vsst->afs_socket, &s->wfds)) {
862 PARA_NOTICE_LOG("requesting new fd from afs\n");
863 ret = send_buffer(vsst->afs_socket, "new");
864 vsst->afsss = AFS_SOCKET_AFD_PENDING;
866 for (i = 0; senders[i].name; i++) {
867 if (!senders[i].post_select)
869 senders[i].post_select(&s->rfds, &s->wfds);
871 if ((vss_playing() && !(mmd->vss_status_flags & VSS_PLAYING)) ||
872 (vss_next() && vss_playing()))
873 tv_add(now, &vsst->announce_tv, &vsst->data_send_barrier);
878 * Initialize the virtual streaming system task.
880 * \param afs_socket The fd for communication with afs.
882 * This also initializes all supported senders and starts streaming
883 * if the --autoplay command line flag was given.
885 void init_vss_task(int afs_socket)
887 static struct vss_task vss_task_struct, *vsst = &vss_task_struct;
889 char *hn = para_hostname(), *home = para_homedir();
890 long unsigned announce_time = conf.announce_time_arg > 0?
891 conf.announce_time_arg : 300,
892 autoplay_delay = conf.autoplay_delay_arg > 0?
893 conf.autoplay_delay_arg : 0;
894 vsst->header_interval.tv_sec = 5; /* should this be configurable? */
895 vsst->afs_socket = afs_socket;
896 vsst->task.pre_select = vss_pre_select;
897 vsst->task.post_select = vss_post_select;
898 ms2tv(announce_time, &vsst->announce_tv);
899 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst->announce_tv));
900 INIT_LIST_HEAD(&fec_client_list);
901 for (i = 0; senders[i].name; i++) {
902 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
903 senders[i].init(&senders[i]);
907 mmd->sender_cmd_data.cmd_num = -1;
908 make_empty_status_items(mmd->afd.verbose_ls_output);
909 if (conf.autoplay_given) {
911 mmd->vss_status_flags |= VSS_PLAYING;
912 mmd->new_vss_status_flags |= VSS_PLAYING;
913 ms2tv(autoplay_delay, &tmp);
914 tv_add(now, &tmp, &vsst->autoplay_barrier);
915 tv_add(&vsst->autoplay_barrier, &vsst->announce_tv,
916 &vsst->data_send_barrier);
918 register_task(&vsst->task);