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 /** Parameters requested by the client. */
141 struct fec_client_parms
*fcp
;
142 /** Used by the core FEC code. */
143 struct fec_parms
*parms
;
144 /** The position of this client in the fec client list. */
145 struct list_head node
;
146 /** When the first slice for this client was sent. */
147 struct timeval stream_start
;
148 /** The first chunk sent to this FEC client. */
149 int first_stream_chunk
;
150 /** Describes the current group. */
151 struct fec_group group
;
152 /** The current slice. */
153 uint8_t current_slice_num
;
154 /** The data to be FEC-encoded (point to a region within the mapped audio file). */
155 const unsigned char **src_data
;
156 /** Last time an audio header was sent. */
157 struct timeval next_header_time
;
158 /** Used for the last source pointer of an audio file. */
159 unsigned char *extra_src_buf
;
160 /** Extra slices needed to store largest chunk + header. */
161 int num_extra_slices
;
162 /** Contains the FEC-encoded data. */
163 unsigned char *enc_buf
;
167 * Get the chunk time of the current audio file.
169 * \return A pointer to a struct containing the chunk time, or NULL,
170 * if currently no audio file is selected.
172 struct timeval
*vss_chunk_time(void)
174 if (mmd
->afd
.afhi
.chunk_tv
.tv_sec
== 0 &&
175 mmd
->afd
.afhi
.chunk_tv
.tv_usec
== 0)
177 return &mmd
->afd
.afhi
.chunk_tv
;
181 * Write a fec header to a buffer.
183 * \param buf The buffer to write to.
184 * \param h The fec header to write.
186 static void write_fec_header(struct fec_client
*fc
, struct vss_task
*vsst
)
188 char *buf
= (char *)fc
->enc_buf
;
189 struct fec_group
*g
= &fc
->group
;
190 struct fec_client_parms
*p
= fc
->fcp
;
192 write_u32(buf
, FEC_MAGIC
);
194 write_u8(buf
+ 4, p
->slices_per_group
+ fc
->num_extra_slices
);
195 write_u8(buf
+ 5, p
->data_slices_per_group
+ fc
->num_extra_slices
);
196 write_u32(buf
+ 6, g
->num_header_slices
? vsst
->header_len
: 0);
198 write_u32(buf
+ 10, g
->num
);
199 write_u32(buf
+ 14, g
->bytes
);
201 write_u8(buf
+ 18, fc
->current_slice_num
);
202 write_u16(buf
+ 20, p
->max_slice_bytes
- FEC_HEADER_SIZE
);
203 write_u8(buf
+ 22, g
->first_chunk
? 0 : 1);
204 write_u8(buf
+ 23, vsst
->header_len
? 1 : 0);
205 memset(buf
+ 24, 0, 7);
208 static int need_audio_header(struct fec_client
*fc
, struct vss_task
*vsst
)
210 if (!mmd
->current_chunk
) {
211 tv_add(now
, &vsst
->header_interval
, &fc
->next_header_time
);
214 if (!vsst
->header_buf
)
216 if (!vsst
->header_len
)
218 if (fc
->group
.num
&& tv_diff(&fc
->next_header_time
, now
, NULL
) > 0)
220 tv_add(now
, &vsst
->header_interval
, &fc
->next_header_time
);
224 static int num_slices(long unsigned bytes
, struct fec_client
*fc
, uint8_t *result
)
226 unsigned long m
= fc
->fcp
->max_slice_bytes
- FEC_HEADER_SIZE
;
227 unsigned rv
, redundant_slices
= fc
->fcp
->slices_per_group
228 - fc
->fcp
->data_slices_per_group
;
232 rv
= (bytes
+ m
- 1) / m
;
233 if (rv
+ redundant_slices
> 255)
239 /* set group start and group duration */
240 static void set_group_timing(struct fec_client
*fc
, struct fec_group
*g
)
242 struct timeval
*chunk_tv
= vss_chunk_time();
244 tv_scale(g
->num_chunks
, chunk_tv
, &g
->duration
);
245 tv_divide(fc
->fcp
->slices_per_group
+ fc
->num_extra_slices
,
246 &g
->duration
, &g
->slice_duration
);
247 PARA_DEBUG_LOG("durations (group/chunk/slice): %lu/%lu/%lu\n",
248 tv2ms(&g
->duration
), tv2ms(chunk_tv
), tv2ms(&g
->slice_duration
));
251 static int setup_next_fec_group(struct fec_client
*fc
, struct vss_task
*vsst
)
253 int ret
, i
, k
, data_slices
;
255 const char *buf
, *start_buf
;
256 struct fec_group
*g
= &fc
->group
;
257 unsigned slice_bytes
= fc
->fcp
->max_slice_bytes
- FEC_HEADER_SIZE
;
258 uint32_t max_data_size
;
260 if (fc
->first_stream_chunk
< 0) {
261 uint8_t hs
, ds
; /* needed header/data slices */
262 uint8_t rs
= fc
->fcp
->slices_per_group
263 - fc
->fcp
->data_slices_per_group
; /* redundant slices */
266 ret
= num_slices(vsst
->header_len
, fc
, &hs
);
269 ret
= num_slices(afh_get_largest_chunk_size(&mmd
->afd
.afhi
),
276 if (k
< fc
->fcp
->data_slices_per_group
)
277 k
= fc
->fcp
->data_slices_per_group
;
279 fc
->num_extra_slices
= k
- fc
->fcp
->data_slices_per_group
;
280 PARA_NOTICE_LOG("fec parms %d:%d:%d (%d extra slices)\n",
281 slice_bytes
, k
, n
, fc
->num_extra_slices
);
283 fc
->src_data
= para_realloc(fc
->src_data
, k
* sizeof(char *));
284 ret
= fec_new(k
, n
, &fc
->parms
);
287 fc
->stream_start
= *now
;
288 fc
->first_stream_chunk
= mmd
->current_chunk
;
289 g
->first_chunk
= mmd
->current_chunk
;
294 if (g
->first_chunk
+ g
->num_chunks
>= mmd
->afd
.afhi
.chunks_total
)
297 * Start and duration of this group depend only on the previous
298 * group. Compute the new group start as g->start += g->duration.
301 tv_add(&tmp
, &g
->duration
, &g
->start
);
302 k
= fc
->fcp
->data_slices_per_group
+ fc
->num_extra_slices
;
303 set_group_timing(fc
, g
);
304 g
->first_chunk
+= g
->num_chunks
;
307 if (need_audio_header(fc
, vsst
)) {
308 ret
= num_slices(vsst
->header_len
, fc
, &g
->num_header_slices
);
312 g
->num_header_slices
= 0;
313 afh_get_chunk(g
->first_chunk
, &mmd
->afd
.afhi
, vsst
->map
, &start_buf
,
315 data_slices
= k
- g
->num_header_slices
;
317 max_data_size
= slice_bytes
* data_slices
;
319 for (i
= g
->first_chunk
; i
< mmd
->afd
.afhi
.chunks_total
; i
++) {
320 afh_get_chunk(i
, &mmd
->afd
.afhi
, vsst
->map
, &buf
, &len
);
321 if (g
->bytes
+ len
> max_data_size
)
325 g
->num_chunks
= i
- g
->first_chunk
;
326 assert(g
->num_chunks
);
327 fc
->current_slice_num
= 0;
329 set_group_timing(fc
, g
);
331 /* setup header slices */
332 buf
= vsst
->header_buf
;
333 for (i
= 0; i
< g
->num_header_slices
; i
++) {
334 fc
->src_data
[i
] = (const unsigned char *)buf
;
338 /* setup data slices */
340 for (i
= g
->num_header_slices
; i
< k
; i
++) {
341 if (buf
+ slice_bytes
> vsst
->map
+ mmd
->size
)
343 * Can not use the memory mapped audio file for this
344 * slice as it goes beyond the map. This slice will not
348 fc
->src_data
[i
] = (const unsigned char *)buf
;
352 uint32_t payload_size
= vsst
->map
+ mmd
->size
- buf
;
353 memcpy(fc
->extra_src_buf
, buf
, payload_size
);
354 fc
->src_data
[i
] = fc
->extra_src_buf
;
356 /* use arbitrary data for all remaining slices */
359 fc
->src_data
[i
] = (const unsigned char *)buf
;
361 PARA_DEBUG_LOG("FEC group %d: %d chunks (%d - %d), "
362 "%d header slices, %d data slices\n",
363 g
->num
, g
->num_chunks
, g
->first_chunk
,
364 g
->first_chunk
+ g
->num_chunks
- 1,
365 g
->num_header_slices
, data_slices
370 static int compute_next_fec_slice(struct fec_client
*fc
, struct vss_task
*vsst
)
372 assert(fc
->error
>= 0);
373 if (fc
->first_stream_chunk
< 0 || fc
->current_slice_num
374 == fc
->fcp
->slices_per_group
+ fc
->num_extra_slices
) {
375 int ret
= setup_next_fec_group(fc
, vsst
);
379 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
380 PARA_ERROR_LOG("FEC client temporarily disabled\n");
385 write_fec_header(fc
, vsst
);
386 fec_encode(fc
->parms
, fc
->src_data
, fc
->enc_buf
+ FEC_HEADER_SIZE
,
387 fc
->current_slice_num
,
388 fc
->fcp
->max_slice_bytes
- FEC_HEADER_SIZE
);
393 * Return a buffer that marks the end of the stream.
395 * \param buf Result pointer.
396 * \return The length of the eof buffer.
398 * This is used for (multicast) udp streaming where closing the socket on the
399 * sender might not give rise to an eof condition at the peer.
401 size_t vss_get_fec_eof_packet(const char **buf
)
403 static const char fec_eof_packet
[FEC_HEADER_SIZE
] = FEC_EOF_PACKET
;
404 *buf
= fec_eof_packet
;
405 return FEC_HEADER_SIZE
;
409 * Add one entry to the list of active fec clients.
411 * \param fcp Describes the fec parameters to be used for this client.
412 * \param result An opaque pointer that must be used by remove the client later.
416 int vss_add_fec_client(struct fec_client_parms
*fcp
, struct fec_client
**result
)
419 struct fec_client
*fc
;
421 if (fcp
->max_slice_bytes
< FEC_HEADER_SIZE
+ fcp
->data_slices_per_group
)
422 return -ERRNO_TO_PARA_ERROR(EINVAL
);
423 fc
= para_calloc(sizeof(*fc
));
425 ret
= fec_new(fcp
->data_slices_per_group
, fcp
->slices_per_group
,
429 fc
->first_stream_chunk
= -1; /* stream not yet started */
430 fc
->src_data
= para_malloc(fc
->fcp
->slices_per_group
* sizeof(char *));
431 fc
->enc_buf
= para_calloc(fc
->fcp
->max_slice_bytes
);
432 fc
->num_extra_slices
= 0;
433 fc
->extra_src_buf
= para_calloc(fc
->fcp
->max_slice_bytes
);
434 fc
->next_header_time
.tv_sec
= 0;
435 para_list_add(&fc
->node
, &fec_client_list
);
446 * Remove one entry from the list of active fec clients.
448 * \param fc The client to be removed.
450 void vss_del_fec_client(struct fec_client
*fc
)
455 free(fc
->extra_src_buf
);
461 * Compute if/when next slice is due. If it isn't due yet and \a diff is
462 * not \p Null, compute the time difference next - now, where
464 * next = stream_start + (first_group_chunk - first_stream_chunk)
465 * * chunk_time + slice_num * slice_time
467 static int next_slice_is_due(struct fec_client
*fc
, struct timeval
*diff
)
469 struct timeval tmp
, next
;
472 if (fc
->first_stream_chunk
< 0)
474 tv_scale(fc
->current_slice_num
, &fc
->group
.slice_duration
, &tmp
);
475 tv_add(&tmp
, &fc
->group
.start
, &next
);
476 ret
= tv_diff(&next
, now
, diff
);
477 return ret
< 0? 1 : 0;
480 static void compute_slice_timeout(struct timeval
*timeout
)
482 struct fec_client
*fc
;
484 assert(vss_playing());
485 list_for_each_entry(fc
, &fec_client_list
, node
) {
490 if (next_slice_is_due(fc
, &diff
)) {
492 timeout
->tv_usec
= 0;
495 /* timeout = min(timeout, diff) */
496 if (tv_diff(&diff
, timeout
, NULL
) < 0)
501 static void set_eof_barrier(struct vss_task
*vsst
)
503 struct fec_client
*fc
;
504 struct timeval timeout
= {1, 0}, *chunk_tv
= vss_chunk_time();
508 list_for_each_entry(fc
, &fec_client_list
, node
) {
509 struct timeval group_duration
;
513 tv_scale(fc
->group
.num_chunks
, chunk_tv
, &group_duration
);
514 if (tv_diff(&timeout
, &group_duration
, NULL
) < 0)
515 timeout
= group_duration
;
518 tv_add(now
, &timeout
, &vsst
->eof_barrier
);
522 * Check if vss status flag \a P (playing) is set.
524 * \return Greater than zero if playing, zero otherwise.
527 unsigned int vss_playing(void)
529 return mmd
->new_vss_status_flags
& VSS_PLAYING
;
533 * Check if the \a N (next) status flag is set.
535 * \return Greater than zero if set, zero if not.
538 unsigned int vss_next(void)
540 return mmd
->new_vss_status_flags
& VSS_NEXT
;
544 * Check if a reposition request is pending.
546 * \return Greater than zero if true, zero otherwise.
549 unsigned int vss_repos(void)
551 return mmd
->new_vss_status_flags
& VSS_REPOS
;
555 * Check if the vss is currently paused.
557 * \return Greater than zero if paused, zero otherwise.
560 unsigned int vss_paused(void)
562 return !(mmd
->new_vss_status_flags
& VSS_NEXT
)
563 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
567 * Check if the vss is currently stopped.
569 * \return Greater than zero if paused, zero otherwise.
572 unsigned int vss_stopped(void)
574 return (mmd
->new_vss_status_flags
& VSS_NEXT
)
575 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
578 static int chk_barrier(const char *bname
, const struct timeval
*barrier
,
579 struct timeval
*diff
, int print_log
)
583 if (tv_diff(now
, barrier
, diff
) > 0)
587 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname
, ms
);
592 * != NULL: timeout for next chunk
593 * NULL: nothing to do
595 static struct timeval
*vss_compute_timeout(struct vss_task
*vsst
)
597 static struct timeval the_timeout
;
598 struct timeval next_chunk
;
600 if (vss_next() && vsst
->map
) {
601 /* only sleep a bit, nec*/
602 the_timeout
.tv_sec
= 0;
603 the_timeout
.tv_usec
= 100;
606 if (chk_barrier("autoplay_delay", &vsst
->autoplay_barrier
,
607 &the_timeout
, 1) < 0)
609 if (chk_barrier("eof", &vsst
->eof_barrier
, &the_timeout
, 1) < 0)
611 if (chk_barrier("data send", &vsst
->data_send_barrier
,
612 &the_timeout
, 1) < 0)
614 if (!vss_playing() || !vsst
->map
)
616 compute_chunk_time(mmd
->chunks_sent
, &mmd
->afd
.afhi
.chunk_tv
,
617 &mmd
->stream_start
, &next_chunk
);
618 if (chk_barrier("chunk", &next_chunk
, &the_timeout
, 0) >= 0) {
619 /* chunk is due or bof */
620 the_timeout
.tv_sec
= 0;
621 the_timeout
.tv_usec
= 0;
624 /* compute min of current timeout and next slice time */
625 compute_slice_timeout(&the_timeout
);
629 static void vss_eof(struct vss_task
*vsst
)
634 if (mmd
->new_vss_status_flags
& VSS_NOMORE
)
635 mmd
->new_vss_status_flags
= VSS_NEXT
;
636 set_eof_barrier(vsst
);
637 para_munmap(vsst
->map
, mmd
->size
);
639 mmd
->chunks_sent
= 0;
641 mmd
->afd
.afhi
.seconds_total
= 0;
642 mmd
->afd
.afhi
.chunk_tv
.tv_sec
= 0;
643 mmd
->afd
.afhi
.chunk_tv
.tv_usec
= 0;
644 free(mmd
->afd
.afhi
.chunk_table
);
645 mmd
->afd
.afhi
.chunk_table
= NULL
;
652 * Get the list of all supported audio formats.
654 * \return Aa space separated list of all supported audio formats
655 * It is not allocated at runtime, i.e. there is no need to free
656 * the returned string in the caller.
658 const char *supported_audio_formats(void)
660 return SUPPORTED_AUDIO_FORMATS
;
663 static int need_to_request_new_audio_file(struct vss_task
*vsst
)
667 if (vsst
->map
) /* have audio file */
669 if (!vss_playing()) /* don't need one */
671 if (mmd
->new_vss_status_flags
& VSS_NOMORE
)
673 if (vsst
->afsss
== AFS_SOCKET_AFD_PENDING
) /* already requested one */
675 if (chk_barrier("autoplay_delay", &vsst
->autoplay_barrier
,
681 static void set_mmd_offset(void)
683 struct timeval offset
;
684 tv_scale(mmd
->current_chunk
, &mmd
->afd
.afhi
.chunk_tv
, &offset
);
685 mmd
->offset
= tv2ms(&offset
);
689 * Compute the timeout for the main select-loop of the scheduler.
691 * \param s Pointer to the server scheduler.
692 * \param t Pointer to the vss task structure.
694 * Before the timeout is computed, the current vss status flags are evaluated
695 * and acted upon by calling appropriate functions from the lower layers.
696 * Possible actions include
698 * - request a new audio file from afs,
699 * - shutdown of all senders (stop/pause command),
700 * - reposition the stream (ff/jmp command).
702 static void vss_pre_select(struct sched
*s
, struct task
*t
)
705 struct timeval
*tv
, diff
;
706 struct vss_task
*vsst
= container_of(t
, struct vss_task
, task
);
708 if (!vsst
->map
|| vss_next() || vss_paused() || vss_repos()) {
709 struct fec_client
*fc
, *tmp
;
710 for (i
= 0; senders
[i
].name
; i
++)
711 if (senders
[i
].shutdown_clients
)
712 senders
[i
].shutdown_clients();
713 list_for_each_entry_safe(fc
, tmp
, &fec_client_list
, node
) {
714 fc
->first_stream_chunk
= -1;
717 mmd
->stream_start
.tv_sec
= 0;
718 mmd
->stream_start
.tv_usec
= 0;
722 else if (vss_paused()) {
723 if (mmd
->chunks_sent
)
724 set_eof_barrier(vsst
);
725 mmd
->chunks_sent
= 0;
726 } else if (vss_repos()) {
727 tv_add(now
, &vsst
->announce_tv
, &vsst
->data_send_barrier
);
728 set_eof_barrier(vsst
);
729 mmd
->chunks_sent
= 0;
730 mmd
->current_chunk
= mmd
->repos_request
;
731 mmd
->new_vss_status_flags
&= ~VSS_REPOS
;
734 if (need_to_request_new_audio_file(vsst
)) {
735 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
736 para_fd_set(vsst
->afs_socket
, &s
->wfds
, &s
->max_fileno
);
737 vsst
->afsss
= AFS_SOCKET_CHECK_FOR_WRITE
;
739 para_fd_set(vsst
->afs_socket
, &s
->rfds
, &s
->max_fileno
);
740 for (i
= 0; senders
[i
].name
; i
++) {
741 if (!senders
[i
].pre_select
)
743 senders
[i
].pre_select(&s
->max_fileno
, &s
->rfds
, &s
->wfds
);
745 tv
= vss_compute_timeout(vsst
);
746 if (tv
&& tv_diff(tv
, &s
->timeout
, &diff
) < 0)
750 static int recv_afs_msg(int afs_socket
, int *fd
, uint32_t *code
, uint32_t *data
)
752 char control
[255], buf
[8];
753 struct msghdr msg
= {.msg_iov
= NULL
};
754 struct cmsghdr
*cmsg
;
760 iov
.iov_len
= sizeof(buf
);
763 msg
.msg_control
= control
;
764 msg
.msg_controllen
= sizeof(control
);
765 memset(buf
, 0, sizeof(buf
));
766 ret
= recvmsg(afs_socket
, &msg
, 0);
768 return -ERRNO_TO_PARA_ERROR(errno
);
769 if (iov
.iov_len
!= sizeof(buf
))
770 return -E_AFS_SHORT_READ
;
771 *code
= *(uint32_t*)buf
;
772 *data
= *(uint32_t*)(buf
+ 4);
773 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
; cmsg
= CMSG_NXTHDR(&msg
, cmsg
)) {
774 if (cmsg
->cmsg_level
!= SOL_SOCKET
775 || cmsg
->cmsg_type
!= SCM_RIGHTS
)
777 if ((cmsg
->cmsg_len
- CMSG_LEN(0)) / sizeof(int) != 1)
779 *fd
= *(int *)CMSG_DATA(cmsg
);
784 static void recv_afs_result(struct vss_task
*vsst
, fd_set
*rfds
)
786 int ret
, passed_fd
, shmid
;
787 uint32_t afs_code
= 0, afs_data
= 0;
790 if (!FD_ISSET(vsst
->afs_socket
, rfds
))
792 ret
= recv_afs_msg(vsst
->afs_socket
, &passed_fd
, &afs_code
, &afs_data
);
793 if (ret
== -ERRNO_TO_PARA_ERROR(EAGAIN
))
797 vsst
->afsss
= AFS_SOCKET_READY
;
798 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd
, afs_code
,
801 if (afs_code
!= NEXT_AUDIO_FILE
)
806 ret
= load_afd(shmid
, &mmd
->afd
);
810 ret
= fstat(passed_fd
, &statbuf
);
812 PARA_ERROR_LOG("fstat error:\n");
813 ret
= -ERRNO_TO_PARA_ERROR(errno
);
816 mmd
->size
= statbuf
.st_size
;
817 mmd
->mtime
= statbuf
.st_mtime
;
818 ret
= para_mmap(mmd
->size
, PROT_READ
, MAP_PRIVATE
, passed_fd
,
823 mmd
->chunks_sent
= 0;
824 mmd
->current_chunk
= 0;
828 mmd
->new_vss_status_flags
&= (~VSS_NEXT
);
829 afh_get_header(&mmd
->afd
.afhi
, vsst
->map
, &vsst
->header_buf
,
833 free(mmd
->afd
.afhi
.chunk_table
);
836 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
837 mmd
->new_vss_status_flags
= VSS_NEXT
;
841 * Main sending function.
843 * This function gets called from vss_post_select(). It checks whether the next
844 * chunk of data should be pushed out. It obtains a pointer to the data to be
845 * sent out as well as its length from mmd->afd.afhi. This information is then
846 * passed to each supported sender's send() function as well as to the send()
847 * functions of each registered fec client.
849 static void vss_send(struct vss_task
*vsst
)
851 int i
, fec_active
= 0;
853 struct fec_client
*fc
, *tmp_fc
;
855 if (!vsst
->map
|| !vss_playing())
857 if (chk_barrier("eof", &vsst
->eof_barrier
, &due
, 1) < 0)
859 if (chk_barrier("data send", &vsst
->data_send_barrier
,
862 list_for_each_entry_safe(fc
, tmp_fc
, &fec_client_list
, node
) {
865 if (!next_slice_is_due(fc
, NULL
)) {
869 if (compute_next_fec_slice(fc
, vsst
) <= 0)
871 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc
->group
.num
,
872 fc
->current_slice_num
, fc
->fcp
->max_slice_bytes
);
873 fc
->fcp
->send((char *)fc
->enc_buf
,
874 fc
->fcp
->max_slice_bytes
,
875 fc
->fcp
->private_data
);
876 fc
->current_slice_num
++;
879 if (mmd
->current_chunk
>= mmd
->afd
.afhi
.chunks_total
) { /* eof */
881 mmd
->new_vss_status_flags
|= VSS_NEXT
;
884 compute_chunk_time(mmd
->chunks_sent
, &mmd
->afd
.afhi
.chunk_tv
,
885 &mmd
->stream_start
, &due
);
886 if (tv_diff(&due
, now
, NULL
) <= 0) {
890 if (!mmd
->chunks_sent
) {
891 mmd
->stream_start
= *now
;
896 * We call the send function also in case of empty chunks as
897 * they might have still some data queued which can be sent in
900 afh_get_chunk(mmd
->current_chunk
, &mmd
->afd
.afhi
, vsst
->map
,
902 for (i
= 0; senders
[i
].name
; i
++) {
903 if (!senders
[i
].send
)
905 senders
[i
].send(mmd
->current_chunk
, mmd
->chunks_sent
,
906 buf
, len
, vsst
->header_buf
, vsst
->header_len
);
909 mmd
->current_chunk
++;
913 static void vss_post_select(struct sched
*s
, struct task
*t
)
916 struct vss_task
*vsst
= container_of(t
, struct vss_task
, task
);
919 if (mmd
->sender_cmd_data
.cmd_num
>= 0) {
920 int num
= mmd
->sender_cmd_data
.cmd_num
,
921 sender_num
= mmd
->sender_cmd_data
.sender_num
;
923 if (senders
[sender_num
].client_cmds
[num
]) {
924 ret
= senders
[sender_num
].client_cmds
[num
]
925 (&mmd
->sender_cmd_data
);
927 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
929 mmd
->sender_cmd_data
.cmd_num
= -1;
931 if (vsst
->afsss
!= AFS_SOCKET_CHECK_FOR_WRITE
)
932 recv_afs_result(vsst
, &s
->rfds
);
933 else if (FD_ISSET(vsst
->afs_socket
, &s
->wfds
)) {
934 PARA_NOTICE_LOG("requesting new fd from afs\n");
935 ret
= send_buffer(vsst
->afs_socket
, "new");
937 PARA_CRIT_LOG("%s\n", para_strerror(-ret
));
939 vsst
->afsss
= AFS_SOCKET_AFD_PENDING
;
941 for (i
= 0; senders
[i
].name
; i
++) {
942 if (!senders
[i
].post_select
)
944 senders
[i
].post_select(&s
->rfds
, &s
->wfds
);
946 if ((vss_playing() && !(mmd
->vss_status_flags
& VSS_PLAYING
)) ||
947 (vss_next() && vss_playing()))
948 tv_add(now
, &vsst
->announce_tv
, &vsst
->data_send_barrier
);
953 * Initialize the virtual streaming system task.
955 * \param afs_socket The fd for communication with afs.
957 * This also initializes all supported senders and starts streaming
958 * if the --autoplay command line flag was given.
960 void init_vss_task(int afs_socket
)
962 static struct vss_task vss_task_struct
, *vsst
= &vss_task_struct
;
964 char *hn
= para_hostname(), *home
= para_homedir();
965 long unsigned announce_time
= conf
.announce_time_arg
> 0?
966 conf
.announce_time_arg
: 300,
967 autoplay_delay
= conf
.autoplay_delay_arg
> 0?
968 conf
.autoplay_delay_arg
: 0;
969 vsst
->header_interval
.tv_sec
= 5; /* should this be configurable? */
970 vsst
->afs_socket
= afs_socket
;
971 vsst
->task
.pre_select
= vss_pre_select
;
972 vsst
->task
.post_select
= vss_post_select
;
973 ms2tv(announce_time
, &vsst
->announce_tv
);
974 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst
->announce_tv
));
975 INIT_LIST_HEAD(&fec_client_list
);
976 for (i
= 0; senders
[i
].name
; i
++) {
977 PARA_NOTICE_LOG("initializing %s sender\n", senders
[i
].name
);
978 senders
[i
].init(&senders
[i
]);
982 mmd
->sender_cmd_data
.cmd_num
= -1;
983 if (conf
.autoplay_given
) {
985 mmd
->vss_status_flags
|= VSS_PLAYING
;
986 mmd
->new_vss_status_flags
|= VSS_PLAYING
;
987 ms2tv(autoplay_delay
, &tmp
);
988 tv_add(now
, &tmp
, &vsst
->autoplay_barrier
);
989 tv_add(&vsst
->autoplay_barrier
, &vsst
->announce_tv
,
990 &vsst
->data_send_barrier
);
992 register_task(&vsst
->task
);