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
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 group duration divided by the number of slices. */
127 struct timeval slice_duration
;
128 /** Group contains the audio file header that occupies that many slices. */
129 uint8_t num_header_slices
;
133 * Describes one connected FEC client.
136 /** If negative, this client is temporarily disabled. */
138 /** Parameters requested by the client. */
139 struct fec_client_parms
*fcp
;
140 /** Used by the core FEC code. */
141 struct fec_parms
*parms
;
142 /** The position of this client in the fec client list. */
143 struct list_head node
;
144 /** When the first slice for this client was sent. */
145 struct timeval stream_start
;
146 /** The first chunk sent to this FEC client. */
147 int first_stream_chunk
;
148 /** Describes the current group. */
149 struct fec_group group
;
150 /** The current slice. */
151 uint8_t current_slice_num
;
152 /** The data to be FEC-encoded (point to a region within the mapped audio file). */
153 const unsigned char **src_data
;
154 /** Last time an audio header was sent. */
155 struct timeval next_header_time
;
156 /** Used for the last source pointer of an audio file. */
157 unsigned char *extra_src_buf
;
158 /** Extra slices needed to store largest chunk + header. */
159 int num_extra_slices
;
160 /** Contains the FEC-encoded data. */
161 unsigned char *enc_buf
;
165 * Get the chunk time of the current audio file.
167 * \return A pointer to a struct containing the chunk time, or NULL,
168 * if currently no audio file is selected.
170 struct timeval
*vss_chunk_time(void)
172 if (mmd
->afd
.afhi
.chunk_tv
.tv_sec
== 0 &&
173 mmd
->afd
.afhi
.chunk_tv
.tv_usec
== 0)
175 return &mmd
->afd
.afhi
.chunk_tv
;
179 * Write a fec header to a buffer.
181 * \param buf The buffer to write to.
182 * \param h The fec header to write.
184 static void write_fec_header(struct fec_client
*fc
, struct vss_task
*vsst
)
186 char *buf
= (char *)fc
->enc_buf
;
187 struct fec_group
*g
= &fc
->group
;
188 struct fec_client_parms
*p
= fc
->fcp
;
190 write_u32(buf
, FEC_MAGIC
);
192 write_u8(buf
+ 4, p
->slices_per_group
+ fc
->num_extra_slices
);
193 write_u8(buf
+ 5, p
->data_slices_per_group
+ fc
->num_extra_slices
);
194 write_u32(buf
+ 6, g
->num_header_slices
? vsst
->header_len
: 0);
196 write_u32(buf
+ 10, g
->num
);
197 write_u32(buf
+ 14, g
->bytes
);
199 write_u8(buf
+ 18, fc
->current_slice_num
);
200 write_u16(buf
+ 20, p
->max_slice_bytes
- FEC_HEADER_SIZE
);
201 write_u8(buf
+ 22, g
->first_chunk
? 0 : 1);
202 write_u8(buf
+ 23, vsst
->header_len
? 1 : 0);
203 memset(buf
+ 24, 0, 7);
206 static int need_audio_header(struct fec_client
*fc
, struct vss_task
*vsst
)
208 if (!mmd
->current_chunk
) {
209 tv_add(now
, &vsst
->header_interval
, &fc
->next_header_time
);
212 if (!vsst
->header_buf
)
214 if (!vsst
->header_len
)
216 if (fc
->group
.num
&& tv_diff(&fc
->next_header_time
, now
, NULL
) > 0)
218 tv_add(now
, &vsst
->header_interval
, &fc
->next_header_time
);
222 static int num_slices(long unsigned bytes
, struct fec_client
*fc
, uint8_t *result
)
224 unsigned long m
= fc
->fcp
->max_slice_bytes
- FEC_HEADER_SIZE
;
225 unsigned rv
, redundant_slices
= fc
->fcp
->slices_per_group
226 - fc
->fcp
->data_slices_per_group
;
230 rv
= (bytes
+ m
- 1) / m
;
231 if (rv
+ redundant_slices
> 255)
237 static void set_slice_duration(struct fec_client
*fc
, struct fec_group
*g
)
239 struct timeval group_duration
, *chunk_tv
= vss_chunk_time();
241 tv_scale(g
->num_chunks
, chunk_tv
, &group_duration
);
242 tv_divide(fc
->fcp
->slices_per_group
+ fc
->num_extra_slices
,
243 &group_duration
, &g
->slice_duration
);
244 PARA_DEBUG_LOG("durations (group/chunk/slice): %lu/%lu/%lu\n",
245 tv2ms(&group_duration
), tv2ms(chunk_tv
), tv2ms(&g
->slice_duration
));
248 static int setup_next_fec_group(struct fec_client
*fc
, struct vss_task
*vsst
)
250 int ret
, i
, k
, data_slices
;
252 const char *buf
, *start_buf
;
253 struct timeval tmp
, *chunk_tv
= vss_chunk_time();
254 struct fec_group
*g
= &fc
->group
;
255 unsigned slice_bytes
= fc
->fcp
->max_slice_bytes
- FEC_HEADER_SIZE
;
256 uint32_t max_data_size
;
259 k
= fc
->fcp
->data_slices_per_group
+ fc
->num_extra_slices
;
260 if (fc
->first_stream_chunk
< 0) {
261 uint32_t largest
= afh_get_largest_chunk_size(&mmd
->afd
.afhi
)
263 uint8_t needed
, want
;
265 ret
= num_slices(largest
, fc
, &needed
);
268 if (needed
> fc
->fcp
->data_slices_per_group
)
269 PARA_WARNING_LOG("fec parms insufficient for this audio file\n");
270 want
= PARA_MAX(needed
, fc
->fcp
->data_slices_per_group
);
273 fc
->src_data
= para_realloc(fc
->src_data
, want
* sizeof(char *));
274 ret
= fec_new(want
, want
+ fc
->fcp
->slices_per_group
275 - fc
->fcp
->data_slices_per_group
, &fc
->parms
);
279 fc
->num_extra_slices
= 0;
280 if (k
> fc
->fcp
->data_slices_per_group
) {
281 fc
->num_extra_slices
= k
- fc
->fcp
->data_slices_per_group
;
282 PARA_NOTICE_LOG("using %d extra slices\n",
283 fc
->num_extra_slices
);
286 fc
->stream_start
= *now
;
287 fc
->first_stream_chunk
= mmd
->current_chunk
;
288 g
->first_chunk
= mmd
->current_chunk
;
291 /* use duration of the previous group for the timing of this group */
292 set_slice_duration(fc
, g
);
293 g
->first_chunk
+= g
->num_chunks
;
296 if (g
->first_chunk
>= mmd
->afd
.afhi
.chunks_total
)
298 if (need_audio_header(fc
, vsst
)) {
299 ret
= num_slices(vsst
->header_len
, fc
, &g
->num_header_slices
);
303 g
->num_header_slices
= 0;
304 afh_get_chunk(g
->first_chunk
, &mmd
->afd
.afhi
, vsst
->map
, &start_buf
,
306 data_slices
= k
- g
->num_header_slices
;
308 max_data_size
= slice_bytes
* data_slices
;
310 for (i
= g
->first_chunk
; i
< mmd
->afd
.afhi
.chunks_total
; i
++) {
311 afh_get_chunk(i
, &mmd
->afd
.afhi
, vsst
->map
, &buf
, &len
);
312 if (g
->bytes
+ len
> max_data_size
)
316 g
->num_chunks
= i
- g
->first_chunk
;
317 assert(g
->num_chunks
);
318 fc
->current_slice_num
= 0;
320 set_slice_duration(fc
, g
);
322 /* setup header slices */
323 buf
= vsst
->header_buf
;
324 for (i
= 0; i
< g
->num_header_slices
; i
++) {
325 fc
->src_data
[i
] = (const unsigned char *)buf
;
329 /* setup data slices */
331 for (i
= g
->num_header_slices
; i
< k
; i
++) {
332 if (buf
+ slice_bytes
> vsst
->map
+ mmd
->size
)
334 * Can not use the memory mapped audio file for this
335 * slice as it goes beyond the map. This slice will not
339 fc
->src_data
[i
] = (const unsigned char *)buf
;
343 uint32_t payload_size
= vsst
->map
+ mmd
->size
- buf
;
344 memcpy(fc
->extra_src_buf
, buf
, payload_size
);
345 fc
->src_data
[i
] = fc
->extra_src_buf
;
347 /* use arbitrary data for all remaining slices */
350 fc
->src_data
[i
] = (const unsigned char *)buf
;
352 PARA_DEBUG_LOG("FEC group %d: %d chunks (%d - %d), "
353 "%d header slices, %d data slices\n",
354 g
->num
, g
->num_chunks
, g
->first_chunk
,
355 g
->first_chunk
+ g
->num_chunks
- 1,
356 g
->num_header_slices
, data_slices
358 /* set group start */
359 tv_scale(g
->first_chunk
- fc
->first_stream_chunk
, chunk_tv
, &tmp
);
360 tv_add(&fc
->stream_start
, &tmp
, &g
->start
);
364 static int compute_next_fec_slice(struct fec_client
*fc
, struct vss_task
*vsst
)
366 assert(fc
->error
>= 0);
367 if (fc
->first_stream_chunk
< 0 || fc
->current_slice_num
368 == fc
->fcp
->slices_per_group
+ fc
->num_extra_slices
) {
369 int ret
= setup_next_fec_group(fc
, vsst
);
373 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
374 PARA_ERROR_LOG("FEC client temporarily disabled\n");
379 write_fec_header(fc
, vsst
);
380 fec_encode(fc
->parms
, fc
->src_data
, fc
->enc_buf
+ FEC_HEADER_SIZE
,
381 fc
->current_slice_num
,
382 fc
->fcp
->max_slice_bytes
- FEC_HEADER_SIZE
);
387 * Return a buffer that marks the end of the stream.
389 * \param buf Result pointer.
390 * \return The length of the eof buffer.
392 * This is used for (multicast) udp streaming where closing the socket on the
393 * sender might not give rise to an eof condition at the peer.
395 size_t vss_get_fec_eof_packet(const char **buf
)
397 static const char fec_eof_packet
[FEC_HEADER_SIZE
] = FEC_EOF_PACKET
;
398 *buf
= fec_eof_packet
;
399 return FEC_HEADER_SIZE
;
403 * Add one entry to the list of active fec clients.
405 * \param fcp Describes the fec parameters to be used for this client.
406 * \param result An opaque pointer that must be used by remove the client later.
410 int vss_add_fec_client(struct fec_client_parms
*fcp
, struct fec_client
**result
)
413 struct fec_client
*fc
;
415 if (fcp
->max_slice_bytes
< FEC_HEADER_SIZE
+ fcp
->data_slices_per_group
)
416 return -ERRNO_TO_PARA_ERROR(EINVAL
);
417 fc
= para_calloc(sizeof(*fc
));
419 ret
= fec_new(fcp
->data_slices_per_group
, fcp
->slices_per_group
,
423 fc
->first_stream_chunk
= -1; /* stream not yet started */
424 fc
->src_data
= para_malloc(fc
->fcp
->slices_per_group
* sizeof(char *));
425 fc
->enc_buf
= para_calloc(fc
->fcp
->max_slice_bytes
);
426 fc
->num_extra_slices
= 0;
427 fc
->extra_src_buf
= para_calloc(fc
->fcp
->max_slice_bytes
);
428 fc
->next_header_time
.tv_sec
= 0;
429 para_list_add(&fc
->node
, &fec_client_list
);
440 * Remove one entry from the list of active fec clients.
442 * \param fc The client to be removed.
444 void vss_del_fec_client(struct fec_client
*fc
)
449 free(fc
->extra_src_buf
);
455 * Compute if/when next slice is due. If it isn't due yet and \a diff is
456 * not \p Null, compute the time difference next - now, where
458 * next = stream_start + (first_group_chunk - first_stream_chunk)
459 * * chunk_time + slice_num * slice_time
461 static int next_slice_is_due(struct fec_client
*fc
, struct timeval
*diff
)
463 struct timeval tmp
, next
;
466 if (fc
->first_stream_chunk
< 0)
468 tv_scale(fc
->current_slice_num
, &fc
->group
.slice_duration
, &tmp
);
469 tv_add(&tmp
, &fc
->group
.start
, &next
);
470 ret
= tv_diff(&next
, now
, diff
);
471 return ret
< 0? 1 : 0;
474 static void compute_slice_timeout(struct timeval
*timeout
)
476 struct fec_client
*fc
;
478 assert(vss_playing());
479 list_for_each_entry(fc
, &fec_client_list
, node
) {
484 if (next_slice_is_due(fc
, &diff
)) {
486 timeout
->tv_usec
= 0;
489 /* timeout = min(timeout, diff) */
490 if (tv_diff(&diff
, timeout
, NULL
) < 0)
495 static void set_eof_barrier(struct vss_task
*vsst
)
497 struct fec_client
*fc
;
498 struct timeval timeout
= {1, 0}, *chunk_tv
= vss_chunk_time();
502 list_for_each_entry(fc
, &fec_client_list
, node
) {
503 struct timeval group_duration
;
507 tv_scale(fc
->group
.num_chunks
, chunk_tv
, &group_duration
);
508 if (tv_diff(&timeout
, &group_duration
, NULL
) < 0)
509 timeout
= group_duration
;
512 tv_add(now
, &timeout
, &vsst
->eof_barrier
);
516 * Check if vss status flag \a P (playing) is set.
518 * \return Greater than zero if playing, zero otherwise.
521 unsigned int vss_playing(void)
523 return mmd
->new_vss_status_flags
& VSS_PLAYING
;
527 * Check if the \a N (next) status flag is set.
529 * \return Greater than zero if set, zero if not.
532 unsigned int vss_next(void)
534 return mmd
->new_vss_status_flags
& VSS_NEXT
;
538 * Check if a reposition request is pending.
540 * \return Greater than zero if true, zero otherwise.
543 unsigned int vss_repos(void)
545 return mmd
->new_vss_status_flags
& VSS_REPOS
;
549 * Check if the vss is currently paused.
551 * \return Greater than zero if paused, zero otherwise.
554 unsigned int vss_paused(void)
556 return !(mmd
->new_vss_status_flags
& VSS_NEXT
)
557 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
561 * Check if the vss is currently stopped.
563 * \return Greater than zero if paused, zero otherwise.
566 unsigned int vss_stopped(void)
568 return (mmd
->new_vss_status_flags
& VSS_NEXT
)
569 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
572 static int chk_barrier(const char *bname
, const struct timeval
*barrier
,
573 struct timeval
*diff
, int print_log
)
577 if (tv_diff(now
, barrier
, diff
) > 0)
581 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname
, ms
);
586 * != NULL: timeout for next chunk
587 * NULL: nothing to do
589 static struct timeval
*vss_compute_timeout(struct vss_task
*vsst
)
591 static struct timeval the_timeout
;
592 struct timeval next_chunk
;
594 if (vss_next() && vsst
->map
) {
595 /* only sleep a bit, nec*/
596 the_timeout
.tv_sec
= 0;
597 the_timeout
.tv_usec
= 100;
600 if (chk_barrier("autoplay_delay", &vsst
->autoplay_barrier
,
601 &the_timeout
, 1) < 0)
603 if (chk_barrier("eof", &vsst
->eof_barrier
, &the_timeout
, 1) < 0)
605 if (chk_barrier("data send", &vsst
->data_send_barrier
,
606 &the_timeout
, 1) < 0)
608 if (!vss_playing() || !vsst
->map
)
610 compute_chunk_time(mmd
->chunks_sent
, &mmd
->afd
.afhi
.chunk_tv
,
611 &mmd
->stream_start
, &next_chunk
);
612 if (chk_barrier("chunk", &next_chunk
, &the_timeout
, 0) >= 0) {
613 /* chunk is due or bof */
614 the_timeout
.tv_sec
= 0;
615 the_timeout
.tv_usec
= 0;
618 /* compute min of current timeout and next slice time */
619 compute_slice_timeout(&the_timeout
);
623 static void vss_eof(struct vss_task
*vsst
)
628 if (mmd
->new_vss_status_flags
& VSS_NOMORE
)
629 mmd
->new_vss_status_flags
= VSS_NEXT
;
630 set_eof_barrier(vsst
);
631 para_munmap(vsst
->map
, mmd
->size
);
633 mmd
->chunks_sent
= 0;
635 mmd
->afd
.afhi
.seconds_total
= 0;
636 mmd
->afd
.afhi
.chunk_tv
.tv_sec
= 0;
637 mmd
->afd
.afhi
.chunk_tv
.tv_usec
= 0;
638 free(mmd
->afd
.afhi
.chunk_table
);
639 mmd
->afd
.afhi
.chunk_table
= NULL
;
646 * Get the list of all supported audio formats.
648 * \return Aa space separated list of all supported audio formats
649 * It is not allocated at runtime, i.e. there is no need to free
650 * the returned string in the caller.
652 const char *supported_audio_formats(void)
654 return SUPPORTED_AUDIO_FORMATS
;
657 static int need_to_request_new_audio_file(struct vss_task
*vsst
)
661 if (vsst
->map
) /* have audio file */
663 if (!vss_playing()) /* don't need one */
665 if (mmd
->new_vss_status_flags
& VSS_NOMORE
)
667 if (vsst
->afsss
== AFS_SOCKET_AFD_PENDING
) /* already requested one */
669 if (chk_barrier("autoplay_delay", &vsst
->autoplay_barrier
,
676 * Compute the timeout for the main select-loop of the scheduler.
678 * \param s Pointer to the server scheduler.
679 * \param t Pointer to the vss task structure.
681 * Before the timeout is computed, the current vss status flags are evaluated
682 * and acted upon by calling appropriate functions from the lower layers.
683 * Possible actions include
685 * - request a new audio file from afs,
686 * - shutdown of all senders (stop/pause command),
687 * - reposition the stream (ff/jmp command).
689 static void vss_pre_select(struct sched
*s
, struct task
*t
)
692 struct timeval
*tv
, diff
;
693 struct vss_task
*vsst
= container_of(t
, struct vss_task
, task
);
695 if (!vsst
->map
|| vss_next() || vss_paused() || vss_repos()) {
696 struct fec_client
*fc
, *tmp
;
697 for (i
= 0; senders
[i
].name
; i
++)
698 if (senders
[i
].shutdown_clients
)
699 senders
[i
].shutdown_clients();
700 list_for_each_entry_safe(fc
, tmp
, &fec_client_list
, node
) {
701 fc
->first_stream_chunk
= -1;
704 mmd
->stream_start
.tv_sec
= 0;
705 mmd
->stream_start
.tv_usec
= 0;
709 else if (vss_paused()) {
710 if (mmd
->chunks_sent
)
711 set_eof_barrier(vsst
);
712 mmd
->chunks_sent
= 0;
713 } else if (vss_repos()) {
714 tv_add(now
, &vsst
->announce_tv
, &vsst
->data_send_barrier
);
715 set_eof_barrier(vsst
);
716 mmd
->chunks_sent
= 0;
717 mmd
->current_chunk
= mmd
->repos_request
;
718 mmd
->new_vss_status_flags
&= ~VSS_REPOS
;
720 if (need_to_request_new_audio_file(vsst
)) {
721 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
722 para_fd_set(vsst
->afs_socket
, &s
->wfds
, &s
->max_fileno
);
723 vsst
->afsss
= AFS_SOCKET_CHECK_FOR_WRITE
;
725 para_fd_set(vsst
->afs_socket
, &s
->rfds
, &s
->max_fileno
);
726 for (i
= 0; senders
[i
].name
; i
++) {
727 if (!senders
[i
].pre_select
)
729 senders
[i
].pre_select(&s
->max_fileno
, &s
->rfds
, &s
->wfds
);
731 tv
= vss_compute_timeout(vsst
);
732 if (tv
&& tv_diff(tv
, &s
->timeout
, &diff
) < 0)
736 static int recv_afs_msg(int afs_socket
, int *fd
, uint32_t *code
, uint32_t *data
)
738 char control
[255], buf
[8];
739 struct msghdr msg
= {.msg_iov
= NULL
};
740 struct cmsghdr
*cmsg
;
746 iov
.iov_len
= sizeof(buf
);
749 msg
.msg_control
= control
;
750 msg
.msg_controllen
= sizeof(control
);
751 memset(buf
, 0, sizeof(buf
));
752 ret
= recvmsg(afs_socket
, &msg
, 0);
754 return -ERRNO_TO_PARA_ERROR(errno
);
755 if (iov
.iov_len
!= sizeof(buf
))
756 return -E_AFS_SHORT_READ
;
757 *code
= *(uint32_t*)buf
;
758 *data
= *(uint32_t*)(buf
+ 4);
759 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
; cmsg
= CMSG_NXTHDR(&msg
, cmsg
)) {
760 if (cmsg
->cmsg_level
!= SOL_SOCKET
761 || cmsg
->cmsg_type
!= SCM_RIGHTS
)
763 if ((cmsg
->cmsg_len
- CMSG_LEN(0)) / sizeof(int) != 1)
765 *fd
= *(int *)CMSG_DATA(cmsg
);
770 static void recv_afs_result(struct vss_task
*vsst
)
772 int ret
, passed_fd
, shmid
;
773 uint32_t afs_code
= 0, afs_data
= 0;
776 vsst
->afsss
= AFS_SOCKET_READY
;
777 ret
= recv_afs_msg(vsst
->afs_socket
, &passed_fd
, &afs_code
, &afs_data
);
780 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd
, afs_code
,
783 if (afs_code
!= NEXT_AUDIO_FILE
)
788 ret
= load_afd(shmid
, &mmd
->afd
);
792 ret
= fstat(passed_fd
, &statbuf
);
794 PARA_ERROR_LOG("fstat error:\n");
795 ret
= -ERRNO_TO_PARA_ERROR(errno
);
798 mmd
->size
= statbuf
.st_size
;
799 mmd
->mtime
= statbuf
.st_mtime
;
800 ret
= para_mmap(mmd
->size
, PROT_READ
, MAP_PRIVATE
, passed_fd
,
805 mmd
->chunks_sent
= 0;
806 mmd
->current_chunk
= 0;
810 mmd
->new_vss_status_flags
&= (~VSS_NEXT
);
811 afh_get_header(&mmd
->afd
.afhi
, vsst
->map
, &vsst
->header_buf
,
815 free(mmd
->afd
.afhi
.chunk_table
);
818 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
819 mmd
->new_vss_status_flags
= VSS_NEXT
;
823 * Main sending function.
825 * This function gets called from vss_post_select(). It checks whether the next
826 * chunk of data should be pushed out. It obtains a pointer to the data to be
827 * sent out as well as its length from mmd->afd.afhi. This information is then
828 * passed to each supported sender's send() function as well as to the send()
829 * functions of each registered fec client.
831 static void vss_send(struct vss_task
*vsst
)
833 int i
, fec_active
= 0;
835 struct fec_client
*fc
, *tmp_fc
;
837 if (!vsst
->map
|| !vss_playing())
839 if (chk_barrier("eof", &vsst
->eof_barrier
, &due
, 1) < 0)
841 if (chk_barrier("data send", &vsst
->data_send_barrier
,
844 list_for_each_entry_safe(fc
, tmp_fc
, &fec_client_list
, node
) {
847 if (!next_slice_is_due(fc
, NULL
)) {
851 if (compute_next_fec_slice(fc
, vsst
) <= 0)
853 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc
->group
.num
,
854 fc
->current_slice_num
, fc
->fcp
->max_slice_bytes
);
855 fc
->fcp
->send((char *)fc
->enc_buf
,
856 fc
->fcp
->max_slice_bytes
,
857 fc
->fcp
->private_data
);
858 fc
->current_slice_num
++;
861 if (mmd
->current_chunk
>= mmd
->afd
.afhi
.chunks_total
) { /* eof */
863 mmd
->new_vss_status_flags
|= VSS_NEXT
;
866 compute_chunk_time(mmd
->chunks_sent
, &mmd
->afd
.afhi
.chunk_tv
,
867 &mmd
->stream_start
, &due
);
868 if (tv_diff(&due
, now
, NULL
) <= 0) {
872 if (!mmd
->chunks_sent
) {
874 mmd
->stream_start
= *now
;
875 tv_scale(mmd
->current_chunk
, &mmd
->afd
.afhi
.chunk_tv
, &tmp
);
876 mmd
->offset
= tv2ms(&tmp
);
880 * We call the send function also in case of empty chunks as
881 * they might have still some data queued which can be sent in
884 afh_get_chunk(mmd
->current_chunk
, &mmd
->afd
.afhi
, vsst
->map
,
886 for (i
= 0; senders
[i
].name
; i
++) {
887 if (!senders
[i
].send
)
889 senders
[i
].send(mmd
->current_chunk
, mmd
->chunks_sent
,
890 buf
, len
, vsst
->header_buf
, vsst
->header_len
);
893 mmd
->current_chunk
++;
897 static void vss_post_select(struct sched
*s
, struct task
*t
)
900 struct vss_task
*vsst
= container_of(t
, struct vss_task
, task
);
903 if (mmd
->sender_cmd_data
.cmd_num
>= 0) {
904 int num
= mmd
->sender_cmd_data
.cmd_num
,
905 sender_num
= mmd
->sender_cmd_data
.sender_num
;
907 if (senders
[sender_num
].client_cmds
[num
])
908 senders
[sender_num
].client_cmds
[num
](&mmd
->sender_cmd_data
);
909 mmd
->sender_cmd_data
.cmd_num
= -1;
911 if (vsst
->afsss
!= AFS_SOCKET_CHECK_FOR_WRITE
) {
912 if (FD_ISSET(vsst
->afs_socket
, &s
->rfds
))
913 recv_afs_result(vsst
);
914 } else if (FD_ISSET(vsst
->afs_socket
, &s
->wfds
)) {
915 PARA_NOTICE_LOG("requesting new fd from afs\n");
916 ret
= send_buffer(vsst
->afs_socket
, "new");
918 PARA_CRIT_LOG("%s\n", para_strerror(-ret
));
920 vsst
->afsss
= AFS_SOCKET_AFD_PENDING
;
922 for (i
= 0; senders
[i
].name
; i
++) {
923 if (!senders
[i
].post_select
)
925 senders
[i
].post_select(&s
->rfds
, &s
->wfds
);
927 if ((vss_playing() && !(mmd
->vss_status_flags
& VSS_PLAYING
)) ||
928 (vss_next() && vss_playing()))
929 tv_add(now
, &vsst
->announce_tv
, &vsst
->data_send_barrier
);
934 * Initialize the virtual streaming system task.
936 * \param afs_socket The fd for communication with afs.
938 * This also initializes all supported senders and starts streaming
939 * if the --autoplay command line flag was given.
941 void init_vss_task(int afs_socket
)
943 static struct vss_task vss_task_struct
, *vsst
= &vss_task_struct
;
945 char *hn
= para_hostname(), *home
= para_homedir();
946 long unsigned announce_time
= conf
.announce_time_arg
> 0?
947 conf
.announce_time_arg
: 300,
948 autoplay_delay
= conf
.autoplay_delay_arg
> 0?
949 conf
.autoplay_delay_arg
: 0;
950 vsst
->header_interval
.tv_sec
= 5; /* should this be configurable? */
951 vsst
->afs_socket
= afs_socket
;
952 vsst
->task
.pre_select
= vss_pre_select
;
953 vsst
->task
.post_select
= vss_post_select
;
954 ms2tv(announce_time
, &vsst
->announce_tv
);
955 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst
->announce_tv
));
956 INIT_LIST_HEAD(&fec_client_list
);
957 for (i
= 0; senders
[i
].name
; i
++) {
958 PARA_NOTICE_LOG("initializing %s sender\n", senders
[i
].name
);
959 senders
[i
].init(&senders
[i
]);
963 mmd
->sender_cmd_data
.cmd_num
= -1;
964 if (conf
.autoplay_given
) {
966 mmd
->vss_status_flags
|= VSS_PLAYING
;
967 mmd
->new_vss_status_flags
|= VSS_PLAYING
;
968 ms2tv(autoplay_delay
, &tmp
);
969 tv_add(now
, &tmp
, &vsst
->autoplay_barrier
);
970 tv_add(&vsst
->autoplay_barrier
, &vsst
->announce_tv
,
971 &vsst
->data_send_barrier
);
973 register_task(&vsst
->task
);