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. */
93 * The list of currently connected fec clients.
95 * Senders may use \ref vss_add_fec_client() to add entries to the list.
97 static struct list_head fec_client_list
;
100 * Describes one slice of a FEC group.
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.
108 /** The slice number within the FEC group. */
110 /** The number of used bytes in this slice. */
115 * Data associated with one FEC group.
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.
122 /** The number of the FEC group. */
124 /** Number of bytes in this group. */
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. */
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
;
139 * Describes one connected 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. */
169 * Get the chunk time of the current audio file.
171 * \return A pointer to a struct containing the chunk time, or NULL,
172 * if currently no audio file is selected.
174 struct timeval
*vss_chunk_time(void)
176 if (mmd
->afd
.afhi
.chunk_tv
.tv_sec
== 0 &&
177 mmd
->afd
.afhi
.chunk_tv
.tv_usec
== 0)
179 return &mmd
->afd
.afhi
.chunk_tv
;
183 * Write a fec header to a buffer.
185 * \param buf The buffer to write to.
186 * \param h The fec header to write.
188 static void write_fec_header(struct fec_client
*fc
)
190 char *buf
= (char *)fc
->enc_buf
;
192 write_u32(buf
, FEC_MAGIC
);
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 */
198 write_u32(buf
+ 10, fc
->group
.num
);
199 write_u32(buf
+ 14, fc
->group
.bytes
);
201 write_u8(buf
+ 18, fc
->slice
.num
);
202 write_u16(buf
+ 20, fc
->slice
.bytes
);
203 memset(buf
+ 22, 0, 11);
206 static int setup_next_fec_group(struct fec_client
*fc
, struct vss_task
*vsst
)
208 uint32_t max_group_size
, last_payload_size
;
209 int i
, k
= fc
->fcp
->data_slices_per_group
;
211 const char *start_buf
;
212 struct timeval tmp
, *chunk_tv
= vss_chunk_time();
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
;
221 fc
->group
.first_chunk
+= fc
->group
.num_chunks
;
224 if (fc
->group
.first_chunk
>= mmd
->afd
.afhi
.chunks_total
)
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
,
229 for (i
= fc
->group
.first_chunk
, fc
->group
.bytes
= 0;
230 i
< mmd
->afd
.afhi
.chunks_total
; i
++) {
233 afh_get_chunk(i
, &mmd
->afd
.afhi
, vsst
->map
, &buf
, &len
);
234 if (fc
->group
.bytes
+ len
> max_group_size
)
236 fc
->group
.bytes
+= len
;
238 fc
->group
.num_chunks
= i
- fc
->group
.first_chunk
;
240 fc
->slice
.bytes
= ROUND_UP(fc
->group
.bytes
, k
) / k
;
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
;
247 tv_scale(fc
->group
.first_chunk
- fc
->first_stream_chunk
, chunk_tv
,
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
);
256 for (i
= 0; i
< k
; i
++)
257 fc
->src_data
[i
] = (const unsigned char *)start_buf
258 + i
* fc
->slice
.bytes
;
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
;
266 memcpy(fc
->extra_src_buf
, start_buf
+ (k
- 1) * fc
->slice
.bytes
,
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
;
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
);
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
));
283 static int compute_next_fec_slice(struct fec_client
*fc
, struct vss_task
*vsst
)
285 if (fc
->first_stream_chunk
< 0 || fc
->slice
.num
286 == fc
->fcp
->slices_per_group
) {
287 if (!setup_next_fec_group(fc
, vsst
))
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
);
297 * Return a buffer that marks the end of the stream.
299 * \param buf Result pointer.
300 * \return The length of the eof buffer.
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.
305 size_t vss_get_fec_eof_packet(const char **buf
)
307 static const char fec_eof_packet
[FEC_HEADER_SIZE
] =
308 "\xec\x0d\xcc\xfe\0\0\0\0"
312 *buf
= fec_eof_packet
;
313 return FEC_HEADER_SIZE
;
317 * Add one entry to the list of active fec clients.
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.
324 int vss_add_fec_client(struct fec_client_parms
*fcp
, struct fec_client
**result
)
327 struct fec_client
*fc
;
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
));
333 ret
= fec_new(fcp
->data_slices_per_group
, fcp
->slices_per_group
,
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
);
350 * Remove one entry from the list of active fec clients.
352 * \param fc The client to be removed.
354 void vss_del_fec_client(struct fec_client
*fc
)
359 free(fc
->extra_src_buf
);
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
368 * next = stream_start + (first_group_chunk - first_stream_chunk)
369 * * chunk_time + slice_num * slice_time
371 static int next_slice_is_due(struct fec_client
*fc
, struct timeval
*diff
)
373 struct timeval tmp
, next
;
376 if (fc
->first_stream_chunk
< 0)
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;
384 static void compute_slice_timeout(struct timeval
*timeout
)
386 struct fec_client
*fc
;
388 assert(vss_playing());
389 list_for_each_entry(fc
, &fec_client_list
, node
) {
392 if (next_slice_is_due(fc
, &diff
)) {
394 timeout
->tv_usec
= 0;
397 /* timeout = min(timeout, diff) */
398 if (tv_diff(&diff
, timeout
, NULL
) < 0)
404 * Check if vss status flag \a P (playing) is set.
406 * \return Greater than zero if playing, zero otherwise.
409 unsigned int vss_playing(void)
411 return mmd
->new_vss_status_flags
& VSS_PLAYING
;
415 * Check if the \a N (next) status flag is set.
417 * \return Greater than zero if set, zero if not.
420 unsigned int vss_next(void)
422 return mmd
->new_vss_status_flags
& VSS_NEXT
;
426 * Check if a reposition request is pending.
428 * \return Greater than zero if true, zero otherwise.
431 unsigned int vss_repos(void)
433 return mmd
->new_vss_status_flags
& VSS_REPOS
;
437 * Check if the vss is currently paused.
439 * \return Greater than zero if paused, zero otherwise.
442 unsigned int vss_paused(void)
444 return !(mmd
->new_vss_status_flags
& VSS_NEXT
)
445 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
449 * Check if the vss is currently stopped.
451 * \return Greater than zero if paused, zero otherwise.
454 unsigned int vss_stopped(void)
456 return (mmd
->new_vss_status_flags
& VSS_NEXT
)
457 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
460 static int chk_barrier(const char *bname
, const struct timeval
*barrier
,
461 struct timeval
*diff
, int print_log
)
465 if (tv_diff(now
, barrier
, diff
) > 0)
469 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname
, ms
);
474 * != NULL: timeout for next chunk
475 * NULL: nothing to do
477 static struct timeval
*vss_compute_timeout(struct vss_task
*vsst
)
479 static struct timeval the_timeout
;
480 struct timeval next_chunk
;
482 if (vss_next() && vsst
->map
) {
483 /* only sleep a bit, nec*/
484 the_timeout
.tv_sec
= 0;
485 the_timeout
.tv_usec
= 100;
488 if (chk_barrier("autoplay_delay", &vsst
->autoplay_barrier
,
489 &the_timeout
, 1) < 0)
491 if (chk_barrier("eof", &vsst
->eof_barrier
, &the_timeout
, 1) < 0)
493 if (chk_barrier("data send", &vsst
->data_send_barrier
,
494 &the_timeout
, 1) < 0)
496 if (!vss_playing() || !vsst
->map
)
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;
506 /* compute min of current timeout and next slice time */
507 compute_slice_timeout(&the_timeout
);
511 static void vss_eof(struct vss_task
*vsst
)
514 mmd
->stream_start
= *now
;
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
);
522 mmd
->chunks_sent
= 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
);
539 * Get the list of all supported audio formats.
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.
545 const char *supported_audio_formats(void)
547 return SUPPORTED_AUDIO_FORMATS
;
550 static int need_to_request_new_audio_file(struct vss_task
*vsst
)
554 if (vsst
->map
) /* have audio file */
556 if (!vss_playing()) /* don't need one */
558 if (mmd
->new_vss_status_flags
& VSS_NOMORE
)
560 if (vsst
->afsss
== AFS_SOCKET_AFD_PENDING
) /* already requested one */
562 if (chk_barrier("autoplay_delay", &vsst
->autoplay_barrier
,
571 * Compute the timeout for para_server's main select-loop.
573 * This function gets called from para_server to determine the timeout value
574 * for its main select loop.
576 * \param s Pointer to the server scheduler.
577 * \param t Pointer to the vss task structure.
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
583 * - request a new audio file from afs,
584 * - shutdown of all senders (stop/pause command),
585 * - reposition the stream (ff/jmp command).
587 static void vss_pre_select(struct sched
*s
, struct task
*t
)
590 struct timeval
*tv
, diff
;
591 struct vss_task
*vsst
= container_of(t
, struct vss_task
, task
);
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;
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
;
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
;
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
)
623 senders
[i
].pre_select(&s
->max_fileno
, &s
->rfds
, &s
->wfds
);
625 tv
= vss_compute_timeout(vsst
);
626 if (tv
&& tv_diff(tv
, &s
->timeout
, &diff
) < 0)
630 static int recv_afs_msg(int afs_socket
, int *fd
, uint32_t *code
, uint32_t *data
)
632 char control
[255], buf
[8];
633 struct msghdr msg
= {.msg_iov
= NULL
};
634 struct cmsghdr
*cmsg
;
640 iov
.iov_len
= sizeof(buf
);
643 msg
.msg_control
= control
;
644 msg
.msg_controllen
= sizeof(control
);
645 memset(buf
, 0, sizeof(buf
));
646 ret
= recvmsg(afs_socket
, &msg
, 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
)
657 if ((cmsg
->cmsg_len
- CMSG_LEN(0)) / sizeof(int) != 1)
659 *fd
= *(int *)CMSG_DATA(cmsg
);
664 static void recv_afs_result(struct vss_task
*vsst
)
666 int ret
, passed_fd
, shmid
;
667 uint32_t afs_code
= 0, afs_data
= 0;
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
);
675 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd
, afs_code
,
678 if (afs_code
!= NEXT_AUDIO_FILE
)
683 ret
= load_afd(shmid
, &mmd
->afd
);
687 ret
= fstat(passed_fd
, &statbuf
);
689 PARA_ERROR_LOG("fstat error:\n");
690 ret
= -ERRNO_TO_PARA_ERROR(errno
);
693 mmd
->size
= statbuf
.st_size
;
694 mmd
->mtime
= statbuf
.st_mtime
;
695 ret
= para_mmap(mmd
->size
, PROT_READ
, MAP_PRIVATE
, passed_fd
,
700 mmd
->chunks_sent
= 0;
701 mmd
->current_chunk
= 0;
705 mmd
->new_vss_status_flags
&= (~VSS_NEXT
);
706 afh_get_header(&mmd
->afd
.afhi
, vsst
->map
, &vsst
->header_buf
,
710 free(mmd
->afd
.afhi
.chunk_table
);
713 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
714 mmd
->new_vss_status_flags
= VSS_NEXT
;
718 * Main sending function.
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.
726 static void vss_send(struct vss_task
*vsst
)
730 struct fec_client
*fc
, *tmp_fc
;
732 if (!vsst
->map
|| !vss_playing())
734 if (chk_barrier("eof", &vsst
->eof_barrier
, &due
, 1) < 0)
736 if (chk_barrier("data send", &vsst
->data_send_barrier
,
739 if (mmd
->current_chunk
>= mmd
->afd
.afhi
.chunks_total
) { /* eof */
740 mmd
->new_vss_status_flags
|= VSS_NEXT
;
743 if (!mmd
->chunks_sent
) {
745 mmd
->stream_start
= *now
;
746 tv_scale(mmd
->current_chunk
, &mmd
->afd
.afhi
.chunk_tv
, &tmp
);
747 mmd
->offset
= tv2ms(&tmp
);
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) {
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
760 afh_get_chunk(mmd
->current_chunk
, &mmd
->afd
.afhi
, vsst
->map
,
762 for (i
= 0; senders
[i
].name
; i
++) {
763 if (!senders
[i
].send
)
765 senders
[i
].send(mmd
->current_chunk
, mmd
->chunks_sent
,
766 buf
, len
, vsst
->header_buf
, vsst
->header_len
);
769 list_for_each_entry_safe(fc
, tmp_fc
, &fec_client_list
, node
) {
770 if (!next_slice_is_due(fc
, NULL
))
772 if (!compute_next_fec_slice(fc
, vsst
))
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
);
781 mmd
->new_vss_status_flags
|= VSS_PLAYING
;
783 mmd
->current_chunk
++;
786 static void vss_post_select(struct sched
*s
, struct task
*t
)
789 struct vss_task
*vsst
= container_of(t
, struct vss_task
, task
);
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
;
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;
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
;
807 for (i
= 0; senders
[i
].name
; i
++) {
808 if (!senders
[i
].post_select
)
810 senders
[i
].post_select(&s
->rfds
, &s
->wfds
);
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
);
819 * Initialize the virtual streaming system task.
821 * \param afs_socket The fd for communication with afs.
823 * This also initializes all supported senders and starts streaming
824 * if the --autoplay command line flag was given.
826 void init_vss_task(int afs_socket
)
828 static struct vss_task vss_task_struct
, *vsst
= &vss_task_struct
;
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;
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
]);
847 mmd
->sender_cmd_data
.cmd_num
= -1;
848 make_empty_status_items(mmd
->afd
.verbose_ls_output
);
849 if (conf
.autoplay_given
) {
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
);
858 INIT_LIST_HEAD(&fec_client_list
);
859 register_task(&vsst
->task
);