2 * Copyright (C) 1997-2010 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
20 #include "portable_io.h"
27 #include "server.cmdline.h"
35 extern struct misc_meta_data
*mmd
;
37 extern void dccp_send_init(struct sender
*);
38 extern void http_send_init(struct sender
*);
39 extern void udp_send_init(struct sender
*);
41 /** The list of supported senders. */
42 struct sender senders
[] = {
45 .init
= http_send_init
,
49 .init
= dccp_send_init
,
53 .init
= udp_send_init
,
60 /** The possible states of the afs socket. */
61 enum afs_socket_status
{
62 /** Socket is inactive. */
64 /** Socket fd was included in the write fd set for select(). */
65 AFS_SOCKET_CHECK_FOR_WRITE
,
66 /** vss wrote a request to the socket and waits for reply from afs. */
67 AFS_SOCKET_AFD_PENDING
70 /** The task structure for the virtual streaming system. */
72 /** Copied from the -announce_time command line option. */
73 struct timeval announce_tv
;
74 /** End of the announcing interval. */
75 struct timeval data_send_barrier
;
76 /** End of the EOF interval. */
77 struct timeval eof_barrier
;
78 /** Only used if --autoplay_delay was given. */
79 struct timeval autoplay_barrier
;
80 /** Used for afs-server communication. */
82 /** The current state of \a afs_socket. */
83 enum afs_socket_status afsss
;
84 /** The memory mapped audio file. */
86 /** Used by the scheduler. */
88 /** Pointer to the header of the mapped audio file. */
89 const char *header_buf
;
90 /** Length of the audio file header. */
92 /** Time between audio file headers are sent. */
93 struct timeval header_interval
;
97 * The list of currently connected fec clients.
99 * Senders may use \ref vss_add_fec_client() to add entries to the list.
101 static struct list_head fec_client_list
;
104 * Data associated with one FEC group.
106 * A FEC group consists of a fixed number of slices and this number is given by
107 * the \a slices_per_group parameter of struct \ref fec_client_parms. Each FEC
108 * group contains a number of chunks of the current audio file.
110 * FEC slices directly correspond to the data packages sent by the paraslash
111 * senders that use FEC. Each slice is identified by its group number and its
112 * number within the group. All slices have the same size, but the last slice
113 * of the group may not be filled entirely.
116 /** The number of the FEC group. */
118 /** Number of bytes in this group. */
120 /** The first chunk of the current audio file belonging to the group. */
121 uint32_t first_chunk
;
122 /** The number of chunks contained in this group. */
124 /** When the first chunk was sent. */
125 struct timeval start
;
126 /** The duration of the full group. */
127 struct timeval duration
;
128 /** The group duration divided by the number of slices. */
129 struct timeval slice_duration
;
130 /** Group contains the audio file header that occupies that many slices. */
131 uint8_t num_header_slices
;
135 * Describes one connected FEC client.
138 /** If negative, this client is temporarily disabled. */
140 /** Whether the sender client is ready to push out data. */
142 /** The connected sender client (transport layer). */
143 struct sender_client
*sc
;
144 /** Parameters requested by the client. */
145 struct fec_client_parms
*fcp
;
146 /** Used by the core FEC code. */
147 struct fec_parms
*parms
;
148 /** The position of this client in the fec client list. */
149 struct list_head node
;
150 /** When the first slice for this client was sent. */
151 struct timeval stream_start
;
152 /** The first chunk sent to this FEC client. */
153 int first_stream_chunk
;
154 /** Describes the current group. */
155 struct fec_group group
;
156 /** The current slice. */
157 uint8_t current_slice_num
;
158 /** The data to be FEC-encoded (point to a region within the mapped audio file). */
159 const unsigned char **src_data
;
160 /** Last time an audio header was sent. */
161 struct timeval next_header_time
;
162 /** Used for the last source pointer of an audio file. */
163 unsigned char *extra_src_buf
;
164 /** Extra slices needed to store largest chunk + header. */
165 int num_extra_slices
;
166 /** Contains the FEC-encoded data. */
167 unsigned char *enc_buf
;
168 /** Pointer obtained from sender when the client is added. */
173 * Get the chunk time of the current audio file.
175 * \return A pointer to a struct containing the chunk time, or NULL,
176 * if currently no audio file is selected.
178 struct timeval
*vss_chunk_time(void)
180 if (mmd
->afd
.afhi
.chunk_tv
.tv_sec
== 0 &&
181 mmd
->afd
.afhi
.chunk_tv
.tv_usec
== 0)
183 return &mmd
->afd
.afhi
.chunk_tv
;
187 * Write a fec header to a buffer.
189 * \param buf The buffer to write to.
190 * \param h The fec header to write.
192 static void write_fec_header(struct fec_client
*fc
, struct vss_task
*vsst
)
194 char *buf
= (char *)fc
->enc_buf
;
195 struct fec_group
*g
= &fc
->group
;
196 struct fec_client_parms
*p
= fc
->fcp
;
198 write_u32(buf
, FEC_MAGIC
);
200 write_u8(buf
+ 4, p
->slices_per_group
+ fc
->num_extra_slices
);
201 write_u8(buf
+ 5, p
->data_slices_per_group
+ fc
->num_extra_slices
);
202 write_u32(buf
+ 6, g
->num_header_slices
? vsst
->header_len
: 0);
204 write_u32(buf
+ 10, g
->num
);
205 write_u32(buf
+ 14, g
->bytes
);
207 write_u8(buf
+ 18, fc
->current_slice_num
);
208 write_u16(buf
+ 20, p
->max_slice_bytes
- FEC_HEADER_SIZE
);
209 write_u8(buf
+ 22, g
->first_chunk
? 0 : 1);
210 write_u8(buf
+ 23, vsst
->header_len
? 1 : 0);
211 memset(buf
+ 24, 0, 7);
214 static int need_audio_header(struct fec_client
*fc
, struct vss_task
*vsst
)
216 if (!mmd
->current_chunk
) {
217 tv_add(now
, &vsst
->header_interval
, &fc
->next_header_time
);
220 if (!vsst
->header_buf
)
222 if (!vsst
->header_len
)
224 if (fc
->group
.num
&& tv_diff(&fc
->next_header_time
, now
, NULL
) > 0)
226 tv_add(now
, &vsst
->header_interval
, &fc
->next_header_time
);
230 static int num_slices(long unsigned bytes
, struct fec_client
*fc
, uint8_t *result
)
232 unsigned long m
= fc
->fcp
->max_slice_bytes
- FEC_HEADER_SIZE
;
233 unsigned rv
, redundant_slices
= fc
->fcp
->slices_per_group
234 - fc
->fcp
->data_slices_per_group
;
238 rv
= (bytes
+ m
- 1) / m
;
239 if (rv
+ redundant_slices
> 255)
245 /* set group start and group duration */
246 static void set_group_timing(struct fec_client
*fc
, struct fec_group
*g
)
248 struct timeval
*chunk_tv
= vss_chunk_time();
250 tv_scale(g
->num_chunks
, chunk_tv
, &g
->duration
);
251 tv_divide(fc
->fcp
->slices_per_group
+ fc
->num_extra_slices
,
252 &g
->duration
, &g
->slice_duration
);
253 PARA_DEBUG_LOG("durations (group/chunk/slice): %lu/%lu/%lu\n",
254 tv2ms(&g
->duration
), tv2ms(chunk_tv
), tv2ms(&g
->slice_duration
));
257 static int setup_next_fec_group(struct fec_client
*fc
, struct vss_task
*vsst
)
259 int ret
, i
, k
, data_slices
;
261 const char *buf
, *start_buf
;
262 struct fec_group
*g
= &fc
->group
;
263 unsigned slice_bytes
= fc
->fcp
->max_slice_bytes
- FEC_HEADER_SIZE
;
264 uint32_t max_data_size
;
266 if (fc
->first_stream_chunk
< 0) {
267 uint8_t hs
, ds
; /* needed header/data slices */
268 uint8_t rs
= fc
->fcp
->slices_per_group
269 - fc
->fcp
->data_slices_per_group
; /* redundant slices */
272 ret
= num_slices(vsst
->header_len
, fc
, &hs
);
275 ret
= num_slices(afh_get_largest_chunk_size(&mmd
->afd
.afhi
),
282 if (k
< fc
->fcp
->data_slices_per_group
)
283 k
= fc
->fcp
->data_slices_per_group
;
285 fc
->num_extra_slices
= k
- fc
->fcp
->data_slices_per_group
;
286 PARA_NOTICE_LOG("fec parms %d:%d:%d (%d extra slices)\n",
287 slice_bytes
, k
, n
, fc
->num_extra_slices
);
289 fc
->src_data
= para_realloc(fc
->src_data
, k
* sizeof(char *));
290 ret
= fec_new(k
, n
, &fc
->parms
);
293 fc
->stream_start
= *now
;
294 fc
->first_stream_chunk
= mmd
->current_chunk
;
295 g
->first_chunk
= mmd
->current_chunk
;
300 if (g
->first_chunk
+ g
->num_chunks
>= mmd
->afd
.afhi
.chunks_total
)
303 * Start and duration of this group depend only on the previous
304 * group. Compute the new group start as g->start += g->duration.
307 tv_add(&tmp
, &g
->duration
, &g
->start
);
308 k
= fc
->fcp
->data_slices_per_group
+ fc
->num_extra_slices
;
309 set_group_timing(fc
, g
);
310 g
->first_chunk
+= g
->num_chunks
;
313 if (need_audio_header(fc
, vsst
)) {
314 ret
= num_slices(vsst
->header_len
, fc
, &g
->num_header_slices
);
318 g
->num_header_slices
= 0;
319 afh_get_chunk(g
->first_chunk
, &mmd
->afd
.afhi
, vsst
->map
, &start_buf
,
321 data_slices
= k
- g
->num_header_slices
;
323 max_data_size
= slice_bytes
* data_slices
;
325 for (i
= g
->first_chunk
; i
< mmd
->afd
.afhi
.chunks_total
; i
++) {
326 afh_get_chunk(i
, &mmd
->afd
.afhi
, vsst
->map
, &buf
, &len
);
327 if (g
->bytes
+ len
> max_data_size
)
331 g
->num_chunks
= i
- g
->first_chunk
;
332 assert(g
->num_chunks
);
333 fc
->current_slice_num
= 0;
335 set_group_timing(fc
, g
);
337 /* setup header slices */
338 buf
= vsst
->header_buf
;
339 for (i
= 0; i
< g
->num_header_slices
; i
++) {
340 fc
->src_data
[i
] = (const unsigned char *)buf
;
344 /* setup data slices */
346 for (i
= g
->num_header_slices
; i
< k
; i
++) {
347 if (buf
+ slice_bytes
> vsst
->map
+ mmd
->size
)
349 * Can not use the memory mapped audio file for this
350 * slice as it goes beyond the map. This slice will not
354 fc
->src_data
[i
] = (const unsigned char *)buf
;
358 uint32_t payload_size
= vsst
->map
+ mmd
->size
- buf
;
359 memcpy(fc
->extra_src_buf
, buf
, payload_size
);
360 fc
->src_data
[i
] = fc
->extra_src_buf
;
362 /* use arbitrary data for all remaining slices */
365 fc
->src_data
[i
] = (const unsigned char *)buf
;
367 PARA_DEBUG_LOG("FEC group %d: %d chunks (%d - %d), "
368 "%d header slices, %d data slices\n",
369 g
->num
, g
->num_chunks
, g
->first_chunk
,
370 g
->first_chunk
+ g
->num_chunks
- 1,
371 g
->num_header_slices
, data_slices
376 static int compute_next_fec_slice(struct fec_client
*fc
, struct vss_task
*vsst
)
378 assert(fc
->error
>= 0);
379 if (fc
->first_stream_chunk
< 0 || fc
->current_slice_num
380 == fc
->fcp
->slices_per_group
+ fc
->num_extra_slices
) {
381 int ret
= setup_next_fec_group(fc
, vsst
);
385 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
386 PARA_ERROR_LOG("FEC client temporarily disabled\n");
391 write_fec_header(fc
, vsst
);
392 fec_encode(fc
->parms
, fc
->src_data
, fc
->enc_buf
+ FEC_HEADER_SIZE
,
393 fc
->current_slice_num
,
394 fc
->fcp
->max_slice_bytes
- FEC_HEADER_SIZE
);
399 * Return a buffer that marks the end of the stream.
401 * \param buf Result pointer.
402 * \return The length of the eof buffer.
404 * This is used for (multicast) udp streaming where closing the socket on the
405 * sender might not give rise to an eof condition at the peer.
407 size_t vss_get_fec_eof_packet(const char **buf
)
409 static const char fec_eof_packet
[FEC_HEADER_SIZE
] = FEC_EOF_PACKET
;
410 *buf
= fec_eof_packet
;
411 return FEC_HEADER_SIZE
;
415 * Add one entry to the list of active fec clients.
417 * \param sc Generic sender_client data of the transport layer.
418 * \param fcp FEC parameters as supplied by the transport layer.
420 * \return Newly allocated fec_client struct.
422 struct fec_client
*vss_add_fec_client(struct sender_client
*sc
,
423 struct fec_client_parms
*fcp
)
425 struct fec_client
*fc
= para_calloc(sizeof(*fc
));
429 para_list_add(&fc
->node
, &fec_client_list
);
434 * Remove one entry from the list of active fec clients.
436 * \param fc The client to be removed.
438 void vss_del_fec_client(struct fec_client
*fc
)
443 free(fc
->extra_src_buf
);
449 * Compute if/when next slice is due. If it isn't due yet and \a diff is
450 * not \p Null, compute the time difference next - now, where
452 * next = stream_start + (first_group_chunk - first_stream_chunk)
453 * * chunk_time + slice_num * slice_time
455 static int next_slice_is_due(struct fec_client
*fc
, struct timeval
*diff
)
457 struct timeval tmp
, next
;
460 if (fc
->first_stream_chunk
< 0)
462 tv_scale(fc
->current_slice_num
, &fc
->group
.slice_duration
, &tmp
);
463 tv_add(&tmp
, &fc
->group
.start
, &next
);
464 ret
= tv_diff(&next
, now
, diff
);
465 return ret
< 0? 1 : 0;
468 static void compute_slice_timeout(struct timeval
*timeout
)
470 struct fec_client
*fc
;
472 assert(vss_playing());
473 list_for_each_entry(fc
, &fec_client_list
, node
) {
478 if (next_slice_is_due(fc
, &diff
)) {
480 timeout
->tv_usec
= 0;
483 /* timeout = min(timeout, diff) */
484 if (tv_diff(&diff
, timeout
, NULL
) < 0)
489 static void set_eof_barrier(struct vss_task
*vsst
)
491 struct fec_client
*fc
;
492 struct timeval timeout
= {1, 0}, *chunk_tv
= vss_chunk_time();
496 list_for_each_entry(fc
, &fec_client_list
, node
) {
497 struct timeval group_duration
;
501 tv_scale(fc
->group
.num_chunks
, chunk_tv
, &group_duration
);
502 if (tv_diff(&timeout
, &group_duration
, NULL
) < 0)
503 timeout
= group_duration
;
506 tv_add(now
, &timeout
, &vsst
->eof_barrier
);
510 * Check if vss status flag \a P (playing) is set.
512 * \return Greater than zero if playing, zero otherwise.
515 unsigned int vss_playing(void)
517 return mmd
->new_vss_status_flags
& VSS_PLAYING
;
521 * Check if the \a N (next) status flag is set.
523 * \return Greater than zero if set, zero if not.
526 unsigned int vss_next(void)
528 return mmd
->new_vss_status_flags
& VSS_NEXT
;
532 * Check if a reposition request is pending.
534 * \return Greater than zero if true, zero otherwise.
537 unsigned int vss_repos(void)
539 return mmd
->new_vss_status_flags
& VSS_REPOS
;
543 * Check if the vss is currently paused.
545 * \return Greater than zero if paused, zero otherwise.
548 unsigned int vss_paused(void)
550 return !(mmd
->new_vss_status_flags
& VSS_NEXT
)
551 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
555 * Check if the vss is currently stopped.
557 * \return Greater than zero if paused, zero otherwise.
560 unsigned int vss_stopped(void)
562 return (mmd
->new_vss_status_flags
& VSS_NEXT
)
563 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
566 static int chk_barrier(const char *bname
, const struct timeval
*barrier
,
567 struct timeval
*diff
, int print_log
)
571 if (tv_diff(now
, barrier
, diff
) > 0)
575 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname
, ms
);
580 * != NULL: timeout for next chunk
581 * NULL: nothing to do
583 static struct timeval
*vss_compute_timeout(struct vss_task
*vsst
)
585 static struct timeval the_timeout
;
586 struct timeval next_chunk
;
588 if (vss_next() && vsst
->map
) {
589 /* only sleep a bit, nec*/
590 the_timeout
.tv_sec
= 0;
591 the_timeout
.tv_usec
= 100;
594 if (chk_barrier("autoplay_delay", &vsst
->autoplay_barrier
,
595 &the_timeout
, 1) < 0)
597 if (chk_barrier("eof", &vsst
->eof_barrier
, &the_timeout
, 1) < 0)
599 if (chk_barrier("data send", &vsst
->data_send_barrier
,
600 &the_timeout
, 1) < 0)
602 if (!vss_playing() || !vsst
->map
)
604 compute_chunk_time(mmd
->chunks_sent
, &mmd
->afd
.afhi
.chunk_tv
,
605 &mmd
->stream_start
, &next_chunk
);
606 if (chk_barrier("chunk", &next_chunk
, &the_timeout
, 0) >= 0) {
607 /* chunk is due or bof */
608 the_timeout
.tv_sec
= 0;
609 the_timeout
.tv_usec
= 0;
612 /* compute min of current timeout and next slice time */
613 compute_slice_timeout(&the_timeout
);
617 static void vss_eof(struct vss_task
*vsst
)
622 if (mmd
->new_vss_status_flags
& VSS_NOMORE
)
623 mmd
->new_vss_status_flags
= VSS_NEXT
;
624 set_eof_barrier(vsst
);
625 para_munmap(vsst
->map
, mmd
->size
);
627 mmd
->chunks_sent
= 0;
629 mmd
->afd
.afhi
.seconds_total
= 0;
630 mmd
->afd
.afhi
.chunk_tv
.tv_sec
= 0;
631 mmd
->afd
.afhi
.chunk_tv
.tv_usec
= 0;
632 free(mmd
->afd
.afhi
.chunk_table
);
633 mmd
->afd
.afhi
.chunk_table
= NULL
;
640 * Get the list of all supported audio formats.
642 * \return Aa space separated list of all supported audio formats
643 * It is not allocated at runtime, i.e. there is no need to free
644 * the returned string in the caller.
646 const char *supported_audio_formats(void)
648 return SUPPORTED_AUDIO_FORMATS
;
651 static int need_to_request_new_audio_file(struct vss_task
*vsst
)
655 if (vsst
->map
) /* have audio file */
657 if (!vss_playing()) /* don't need one */
659 if (mmd
->new_vss_status_flags
& VSS_NOMORE
)
661 if (vsst
->afsss
== AFS_SOCKET_AFD_PENDING
) /* already requested one */
663 if (chk_barrier("autoplay_delay", &vsst
->autoplay_barrier
,
669 static void set_mmd_offset(void)
671 struct timeval offset
;
672 tv_scale(mmd
->current_chunk
, &mmd
->afd
.afhi
.chunk_tv
, &offset
);
673 mmd
->offset
= tv2ms(&offset
);
677 * Compute the timeout for the main select-loop of the scheduler.
679 * \param s Pointer to the server scheduler.
680 * \param t Pointer to the vss task structure.
682 * Before the timeout is computed, the current vss status flags are evaluated
683 * and acted upon by calling appropriate functions from the lower layers.
684 * Possible actions include
686 * - request a new audio file from afs,
687 * - shutdown of all senders (stop/pause command),
688 * - reposition the stream (ff/jmp command).
690 static void vss_pre_select(struct sched
*s
, struct task
*t
)
693 struct timeval
*tv
, diff
;
694 struct vss_task
*vsst
= container_of(t
, struct vss_task
, task
);
696 if (!vsst
->map
|| vss_next() || vss_paused() || vss_repos()) {
697 struct fec_client
*fc
, *tmp
;
698 for (i
= 0; senders
[i
].name
; i
++)
699 if (senders
[i
].shutdown_clients
)
700 senders
[i
].shutdown_clients();
701 list_for_each_entry_safe(fc
, tmp
, &fec_client_list
, node
) {
702 fc
->first_stream_chunk
= -1;
705 mmd
->stream_start
.tv_sec
= 0;
706 mmd
->stream_start
.tv_usec
= 0;
710 else if (vss_paused()) {
711 if (mmd
->chunks_sent
)
712 set_eof_barrier(vsst
);
713 mmd
->chunks_sent
= 0;
714 } else if (vss_repos()) {
715 tv_add(now
, &vsst
->announce_tv
, &vsst
->data_send_barrier
);
716 set_eof_barrier(vsst
);
717 mmd
->chunks_sent
= 0;
718 mmd
->current_chunk
= mmd
->repos_request
;
719 mmd
->new_vss_status_flags
&= ~VSS_REPOS
;
722 if (need_to_request_new_audio_file(vsst
)) {
723 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
724 para_fd_set(vsst
->afs_socket
, &s
->wfds
, &s
->max_fileno
);
725 vsst
->afsss
= AFS_SOCKET_CHECK_FOR_WRITE
;
727 para_fd_set(vsst
->afs_socket
, &s
->rfds
, &s
->max_fileno
);
728 for (i
= 0; senders
[i
].name
; i
++) {
729 if (!senders
[i
].pre_select
)
731 senders
[i
].pre_select(&s
->max_fileno
, &s
->rfds
, &s
->wfds
);
733 tv
= vss_compute_timeout(vsst
);
734 if (tv
&& tv_diff(tv
, &s
->timeout
, &diff
) < 0)
738 static int recv_afs_msg(int afs_socket
, int *fd
, uint32_t *code
, uint32_t *data
)
740 char control
[255], buf
[8];
741 struct msghdr msg
= {.msg_iov
= NULL
};
742 struct cmsghdr
*cmsg
;
748 iov
.iov_len
= sizeof(buf
);
751 msg
.msg_control
= control
;
752 msg
.msg_controllen
= sizeof(control
);
753 memset(buf
, 0, sizeof(buf
));
754 ret
= recvmsg(afs_socket
, &msg
, 0);
756 return -ERRNO_TO_PARA_ERROR(errno
);
757 if (iov
.iov_len
!= sizeof(buf
))
758 return -E_AFS_SHORT_READ
;
759 *code
= *(uint32_t*)buf
;
760 *data
= *(uint32_t*)(buf
+ 4);
761 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
; cmsg
= CMSG_NXTHDR(&msg
, cmsg
)) {
762 if (cmsg
->cmsg_level
!= SOL_SOCKET
763 || cmsg
->cmsg_type
!= SCM_RIGHTS
)
765 if ((cmsg
->cmsg_len
- CMSG_LEN(0)) / sizeof(int) != 1)
767 *fd
= *(int *)CMSG_DATA(cmsg
);
772 static void recv_afs_result(struct vss_task
*vsst
, fd_set
*rfds
)
774 int ret
, passed_fd
, shmid
;
775 uint32_t afs_code
= 0, afs_data
= 0;
778 if (!FD_ISSET(vsst
->afs_socket
, rfds
))
780 ret
= recv_afs_msg(vsst
->afs_socket
, &passed_fd
, &afs_code
, &afs_data
);
781 if (ret
== -ERRNO_TO_PARA_ERROR(EAGAIN
))
785 vsst
->afsss
= AFS_SOCKET_READY
;
786 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd
, afs_code
,
789 if (afs_code
!= NEXT_AUDIO_FILE
)
794 ret
= load_afd(shmid
, &mmd
->afd
);
798 ret
= fstat(passed_fd
, &statbuf
);
800 PARA_ERROR_LOG("fstat error:\n");
801 ret
= -ERRNO_TO_PARA_ERROR(errno
);
804 mmd
->size
= statbuf
.st_size
;
805 mmd
->mtime
= statbuf
.st_mtime
;
806 ret
= para_mmap(mmd
->size
, PROT_READ
, MAP_PRIVATE
, passed_fd
,
811 mmd
->chunks_sent
= 0;
812 mmd
->current_chunk
= 0;
816 mmd
->new_vss_status_flags
&= (~VSS_NEXT
);
817 afh_get_header(&mmd
->afd
.afhi
, vsst
->map
, &vsst
->header_buf
,
821 free(mmd
->afd
.afhi
.chunk_table
);
824 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
825 mmd
->new_vss_status_flags
= VSS_NEXT
;
828 static int initialize_fec_client(struct fec_client
*fc
)
831 struct fec_client_parms
*fcp
= fc
->fcp
;
835 * Set the maximum slice size to the Maximum Packet Size if the
836 * transport protocol allows to determine this value. The user
837 * can specify a slice size up to this value.
839 ret
= fcp
->init_fec(fc
->sc
);
842 if (!fcp
->max_slice_bytes
|| fcp
->max_slice_bytes
> ret
)
843 fcp
->max_slice_bytes
= ret
;
845 if (fcp
->max_slice_bytes
< FEC_HEADER_SIZE
+ fcp
->data_slices_per_group
)
846 return -ERRNO_TO_PARA_ERROR(EINVAL
);
847 ret
= fec_new(fcp
->data_slices_per_group
, fcp
->slices_per_group
,
851 fc
->first_stream_chunk
= -1; /* stream not yet started */
852 fc
->src_data
= para_malloc(fc
->fcp
->slices_per_group
* sizeof(char *));
853 fc
->enc_buf
= para_calloc(fc
->fcp
->max_slice_bytes
);
854 fc
->num_extra_slices
= 0;
855 fc
->extra_src_buf
= para_calloc(fc
->fcp
->max_slice_bytes
);
856 fc
->next_header_time
.tv_sec
= 0;
865 * Main sending function.
867 * This function gets called from vss_post_select(). It checks whether the next
868 * chunk of data should be pushed out. It obtains a pointer to the data to be
869 * sent out as well as its length from mmd->afd.afhi. This information is then
870 * passed to each supported sender's send() function as well as to the send()
871 * functions of each registered fec client.
873 static void vss_send(struct vss_task
*vsst
)
875 int ret
, i
, fec_active
= 0;
877 struct fec_client
*fc
, *tmp_fc
;
879 if (!vsst
->map
|| !vss_playing())
881 if (chk_barrier("eof", &vsst
->eof_barrier
, &due
, 1) < 0)
883 if (chk_barrier("data send", &vsst
->data_send_barrier
,
886 list_for_each_entry_safe(fc
, tmp_fc
, &fec_client_list
, node
) {
890 ret
= initialize_fec_client(fc
);
892 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
896 if (!next_slice_is_due(fc
, NULL
)) {
900 if (compute_next_fec_slice(fc
, vsst
) <= 0)
902 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc
->group
.num
,
903 fc
->current_slice_num
, fc
->fcp
->max_slice_bytes
);
904 fc
->fcp
->send_fec(fc
->sc
, (char *)fc
->enc_buf
,
905 fc
->fcp
->max_slice_bytes
);
906 fc
->current_slice_num
++;
909 if (mmd
->current_chunk
>= mmd
->afd
.afhi
.chunks_total
) { /* eof */
911 mmd
->new_vss_status_flags
|= VSS_NEXT
;
914 compute_chunk_time(mmd
->chunks_sent
, &mmd
->afd
.afhi
.chunk_tv
,
915 &mmd
->stream_start
, &due
);
916 if (tv_diff(&due
, now
, NULL
) <= 0) {
920 if (!mmd
->chunks_sent
) {
921 mmd
->stream_start
= *now
;
926 * We call the send function also in case of empty chunks as
927 * they might have still some data queued which can be sent in
930 afh_get_chunk(mmd
->current_chunk
, &mmd
->afd
.afhi
, vsst
->map
,
932 for (i
= 0; senders
[i
].name
; i
++) {
933 if (!senders
[i
].send
)
935 senders
[i
].send(mmd
->current_chunk
, mmd
->chunks_sent
,
936 buf
, len
, vsst
->header_buf
, vsst
->header_len
);
939 mmd
->current_chunk
++;
943 static void vss_post_select(struct sched
*s
, struct task
*t
)
946 struct vss_task
*vsst
= container_of(t
, struct vss_task
, task
);
949 if (mmd
->sender_cmd_data
.cmd_num
>= 0) {
950 int num
= mmd
->sender_cmd_data
.cmd_num
,
951 sender_num
= mmd
->sender_cmd_data
.sender_num
;
953 if (senders
[sender_num
].client_cmds
[num
])
954 senders
[sender_num
].client_cmds
[num
](&mmd
->sender_cmd_data
);
955 mmd
->sender_cmd_data
.cmd_num
= -1;
957 if (vsst
->afsss
!= AFS_SOCKET_CHECK_FOR_WRITE
)
958 recv_afs_result(vsst
, &s
->rfds
);
959 else if (FD_ISSET(vsst
->afs_socket
, &s
->wfds
)) {
960 PARA_NOTICE_LOG("requesting new fd from afs\n");
961 ret
= send_buffer(vsst
->afs_socket
, "new");
963 PARA_CRIT_LOG("%s\n", para_strerror(-ret
));
965 vsst
->afsss
= AFS_SOCKET_AFD_PENDING
;
967 for (i
= 0; senders
[i
].name
; i
++) {
968 if (!senders
[i
].post_select
)
970 senders
[i
].post_select(&s
->rfds
, &s
->wfds
);
972 if ((vss_playing() && !(mmd
->vss_status_flags
& VSS_PLAYING
)) ||
973 (vss_next() && vss_playing()))
974 tv_add(now
, &vsst
->announce_tv
, &vsst
->data_send_barrier
);
979 * Initialize the virtual streaming system task.
981 * \param afs_socket The fd for communication with afs.
983 * This also initializes all supported senders and starts streaming
984 * if the --autoplay command line flag was given.
986 void init_vss_task(int afs_socket
)
988 static struct vss_task vss_task_struct
, *vsst
= &vss_task_struct
;
990 char *hn
= para_hostname(), *home
= para_homedir();
991 long unsigned announce_time
= conf
.announce_time_arg
> 0?
992 conf
.announce_time_arg
: 300,
993 autoplay_delay
= conf
.autoplay_delay_arg
> 0?
994 conf
.autoplay_delay_arg
: 0;
995 vsst
->header_interval
.tv_sec
= 5; /* should this be configurable? */
996 vsst
->afs_socket
= afs_socket
;
997 vsst
->task
.pre_select
= vss_pre_select
;
998 vsst
->task
.post_select
= vss_post_select
;
999 ms2tv(announce_time
, &vsst
->announce_tv
);
1000 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst
->announce_tv
));
1001 INIT_LIST_HEAD(&fec_client_list
);
1002 for (i
= 0; senders
[i
].name
; i
++) {
1003 PARA_NOTICE_LOG("initializing %s sender\n", senders
[i
].name
);
1004 senders
[i
].init(&senders
[i
]);
1008 mmd
->sender_cmd_data
.cmd_num
= -1;
1009 if (conf
.autoplay_given
) {
1011 mmd
->vss_status_flags
|= VSS_PLAYING
;
1012 mmd
->new_vss_status_flags
|= VSS_PLAYING
;
1013 ms2tv(autoplay_delay
, &tmp
);
1014 tv_add(now
, &tmp
, &vsst
->autoplay_barrier
);
1015 tv_add(&vsst
->autoplay_barrier
, &vsst
->announce_tv
,
1016 &vsst
->data_send_barrier
);
1018 register_task(&vsst
->task
);