2 * Copyright (C) 1997-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file vss.c The virtual streaming system.
9 * This contains the audio streaming code of para_server which is independent
10 * of the current audio format, audio file selector and of the activated
18 #include "portable_io.h"
25 #include "server.cmdline.h"
33 extern struct misc_meta_data
*mmd
;
35 extern void dccp_send_init(struct sender
*);
36 extern void http_send_init(struct sender
*);
37 extern void udp_send_init(struct sender
*);
39 /** The list of supported senders. */
40 struct sender senders
[] = {
43 .init
= http_send_init
,
47 .init
= dccp_send_init
,
51 .init
= udp_send_init
,
58 /** The possible states of the afs socket. */
59 enum afs_socket_status
{
60 /** Socket is inactive. */
62 /** Socket fd was included in the write fd set for select(). */
63 AFS_SOCKET_CHECK_FOR_WRITE
,
64 /** vss wrote a request to the socket and waits for reply from afs. */
65 AFS_SOCKET_AFD_PENDING
68 /** The task structure for the virtual streaming system. */
70 /** Copied from the -announce_time command line option. */
71 struct timeval announce_tv
;
72 /** End of the announcing interval. */
73 struct timeval data_send_barrier
;
74 /** End of the EOF interval. */
75 struct timeval eof_barrier
;
76 /** Only used if --autoplay_delay was given. */
77 struct timeval autoplay_barrier
;
78 /** Used for afs-server communication. */
80 /** The current state of \a afs_socket. */
81 enum afs_socket_status afsss
;
82 /** The memory mapped audio file. */
84 /** Used by the scheduler. */
86 /** Pointer to the header of the mapped audio file. */
87 const char *header_buf
;
88 /** Length of the audio file header. */
90 /** Time between audio file headers are sent. */
91 struct timeval header_interval
;
95 * The list of currently connected fec clients.
97 * Senders may use \ref vss_add_fec_client() to add entries to the list.
99 static struct list_head fec_client_list
;
102 * Data associated with one FEC group.
104 * A FEC group consists of a fixed number of slices and this number is given by
105 * the \a slices_per_group parameter of struct \ref fec_client_parms. Each FEC
106 * group contains a number of chunks of the current audio file.
108 * FEC slices directly correspond to the data packages sent by the paraslash
109 * senders that use FEC. Each slice is identified by its group number and its
110 * number within the group. All slices have the same size, but the last slice
111 * of the group may not be filled entirely.
114 /** The number of the FEC group. */
116 /** Number of bytes in this group. */
118 /** The first chunk of the current audio file belonging to the group. */
119 uint32_t first_chunk
;
120 /** The number of chunks contained in this group. */
122 /** When the first chunk was sent. */
123 struct timeval start
;
124 /** The group duration divided by the number of slices. */
125 struct timeval slice_duration
;
126 /** Group contains the audio file header that occupies that many slices. */
127 uint8_t num_header_slices
;
131 * Describes one connected FEC client.
134 /** If negative, this client is temporarily disabled. */
136 /** Parameters requested by the client. */
137 struct fec_client_parms
*fcp
;
138 /** Used by the core FEC code. */
139 struct fec_parms
*parms
;
140 /** The position of this client in the fec client list. */
141 struct list_head node
;
142 /** When the first slice for this client was sent. */
143 struct timeval stream_start
;
144 /** The first chunk sent to this FEC client. */
145 int first_stream_chunk
;
146 /** Describes the current group. */
147 struct fec_group group
;
148 /** The current slice. */
149 uint8_t current_slice_num
;
150 /** The data to be FEC-encoded (point to a region within the mapped audio file). */
151 const unsigned char **src_data
;
152 /** Last time an audio header was sent. */
153 struct timeval next_header_time
;
154 /** Used for the last source pointer of an audio file. */
155 unsigned char *extra_src_buf
;
156 /** Extra slices needed to store largest chunk + header. */
157 int num_extra_slices
;
158 /** Contains the FEC-encoded data. */
159 unsigned char *enc_buf
;
163 * Get the chunk time of the current audio file.
165 * \return A pointer to a struct containing the chunk time, or NULL,
166 * if currently no audio file is selected.
168 struct timeval
*vss_chunk_time(void)
170 if (mmd
->afd
.afhi
.chunk_tv
.tv_sec
== 0 &&
171 mmd
->afd
.afhi
.chunk_tv
.tv_usec
== 0)
173 return &mmd
->afd
.afhi
.chunk_tv
;
177 * Write a fec header to a buffer.
179 * \param buf The buffer to write to.
180 * \param h The fec header to write.
182 static void write_fec_header(struct fec_client
*fc
, struct vss_task
*vsst
)
184 char *buf
= (char *)fc
->enc_buf
;
185 struct fec_group
*g
= &fc
->group
;
186 struct fec_client_parms
*p
= fc
->fcp
;
188 write_u32(buf
, FEC_MAGIC
);
190 write_u8(buf
+ 4, p
->slices_per_group
+ fc
->num_extra_slices
);
191 write_u8(buf
+ 5, p
->data_slices_per_group
+ fc
->num_extra_slices
);
192 write_u32(buf
+ 6, g
->num_header_slices
? vsst
->header_len
: 0);
194 write_u32(buf
+ 10, g
->num
);
195 write_u32(buf
+ 14, g
->bytes
);
197 write_u8(buf
+ 18, fc
->current_slice_num
);
198 write_u16(buf
+ 20, p
->max_slice_bytes
- FEC_HEADER_SIZE
);
199 write_u8(buf
+ 22, g
->first_chunk
? 0 : 1);
200 write_u8(buf
+ 23, vsst
->header_len
? 1 : 0);
201 memset(buf
+ 24, 0, 7);
204 static int need_audio_header(struct fec_client
*fc
, struct vss_task
*vsst
)
206 if (!mmd
->current_chunk
) {
207 tv_add(now
, &vsst
->header_interval
, &fc
->next_header_time
);
210 if (!vsst
->header_buf
)
212 if (!vsst
->header_len
)
214 if (fc
->group
.num
&& tv_diff(&fc
->next_header_time
, now
, NULL
) > 0)
216 tv_add(now
, &vsst
->header_interval
, &fc
->next_header_time
);
220 static int num_slices(long unsigned bytes
, struct fec_client
*fc
, uint8_t *result
)
222 unsigned long m
= fc
->fcp
->max_slice_bytes
- FEC_HEADER_SIZE
;
223 unsigned rv
, redundant_slices
= fc
->fcp
->slices_per_group
224 - fc
->fcp
->data_slices_per_group
;
228 rv
= (bytes
+ m
- 1) / m
;
229 if (rv
+ redundant_slices
> 255)
235 static void set_slice_duration(struct fec_client
*fc
, struct fec_group
*g
)
237 struct timeval group_duration
, *chunk_tv
= vss_chunk_time();
239 tv_scale(g
->num_chunks
, chunk_tv
, &group_duration
);
240 tv_divide(fc
->fcp
->slices_per_group
+ fc
->num_extra_slices
,
241 &group_duration
, &g
->slice_duration
);
242 PARA_DEBUG_LOG("durations (group/chunk/slice): %lu/%lu/%lu\n",
243 tv2ms(&group_duration
), tv2ms(chunk_tv
), tv2ms(&g
->slice_duration
));
246 static int setup_next_fec_group(struct fec_client
*fc
, struct vss_task
*vsst
)
248 int ret
, i
, k
, data_slices
;
250 const char *buf
, *start_buf
;
251 struct timeval tmp
, *chunk_tv
= vss_chunk_time();
252 struct fec_group
*g
= &fc
->group
;
253 unsigned slice_bytes
= fc
->fcp
->max_slice_bytes
- FEC_HEADER_SIZE
;
254 uint32_t max_data_size
;
257 if (fc
->first_stream_chunk
< 0) {
258 uint8_t hs
, ds
; /* needed header/data slices */
259 uint8_t rs
= fc
->fcp
->slices_per_group
260 - fc
->fcp
->data_slices_per_group
; /* redundant slices */
263 ret
= num_slices(vsst
->header_len
, fc
, &hs
);
266 ret
= num_slices(afh_get_largest_chunk_size(&mmd
->afd
.afhi
),
273 if (k
< fc
->fcp
->data_slices_per_group
)
274 k
= fc
->fcp
->data_slices_per_group
;
276 fc
->num_extra_slices
= k
- fc
->fcp
->data_slices_per_group
;
277 PARA_NOTICE_LOG("fec parms %d:%d:%d (%d extra slices)\n",
278 slice_bytes
, k
, n
, fc
->num_extra_slices
);
280 fc
->src_data
= para_realloc(fc
->src_data
, k
* sizeof(char *));
281 ret
= fec_new(k
, n
, &fc
->parms
);
284 fc
->stream_start
= *now
;
285 fc
->first_stream_chunk
= mmd
->current_chunk
;
286 g
->first_chunk
= mmd
->current_chunk
;
289 k
= fc
->fcp
->data_slices_per_group
+ fc
->num_extra_slices
;
290 /* use duration of the previous group for the timing of this group */
291 set_slice_duration(fc
, g
);
292 g
->first_chunk
+= g
->num_chunks
;
295 if (g
->first_chunk
>= mmd
->afd
.afhi
.chunks_total
)
297 if (need_audio_header(fc
, vsst
)) {
298 ret
= num_slices(vsst
->header_len
, fc
, &g
->num_header_slices
);
302 g
->num_header_slices
= 0;
303 afh_get_chunk(g
->first_chunk
, &mmd
->afd
.afhi
, vsst
->map
, &start_buf
,
305 data_slices
= k
- g
->num_header_slices
;
307 max_data_size
= slice_bytes
* data_slices
;
309 for (i
= g
->first_chunk
; i
< mmd
->afd
.afhi
.chunks_total
; i
++) {
310 afh_get_chunk(i
, &mmd
->afd
.afhi
, vsst
->map
, &buf
, &len
);
311 if (g
->bytes
+ len
> max_data_size
)
315 g
->num_chunks
= i
- g
->first_chunk
;
316 assert(g
->num_chunks
);
317 fc
->current_slice_num
= 0;
319 set_slice_duration(fc
, g
);
321 /* setup header slices */
322 buf
= vsst
->header_buf
;
323 for (i
= 0; i
< g
->num_header_slices
; i
++) {
324 fc
->src_data
[i
] = (const unsigned char *)buf
;
328 /* setup data slices */
330 for (i
= g
->num_header_slices
; i
< k
; i
++) {
331 if (buf
+ slice_bytes
> vsst
->map
+ mmd
->size
)
333 * Can not use the memory mapped audio file for this
334 * slice as it goes beyond the map. This slice will not
338 fc
->src_data
[i
] = (const unsigned char *)buf
;
342 uint32_t payload_size
= vsst
->map
+ mmd
->size
- buf
;
343 memcpy(fc
->extra_src_buf
, buf
, payload_size
);
344 fc
->src_data
[i
] = fc
->extra_src_buf
;
346 /* use arbitrary data for all remaining slices */
349 fc
->src_data
[i
] = (const unsigned char *)buf
;
351 PARA_DEBUG_LOG("FEC group %d: %d chunks (%d - %d), "
352 "%d header slices, %d data slices\n",
353 g
->num
, g
->num_chunks
, g
->first_chunk
,
354 g
->first_chunk
+ g
->num_chunks
- 1,
355 g
->num_header_slices
, data_slices
357 /* set group start */
358 if (g
->num
!= 0 && vsst
->header_len
!= 0 && fc
->first_stream_chunk
== 0)
359 /* chunk #0 is the audio file header */
360 tv_scale(g
->first_chunk
- 1, chunk_tv
, &tmp
);
362 tv_scale(g
->first_chunk
- fc
->first_stream_chunk
,
364 tv_add(&fc
->stream_start
, &tmp
, &g
->start
);
368 static int compute_next_fec_slice(struct fec_client
*fc
, struct vss_task
*vsst
)
370 assert(fc
->error
>= 0);
371 if (fc
->first_stream_chunk
< 0 || fc
->current_slice_num
372 == fc
->fcp
->slices_per_group
+ fc
->num_extra_slices
) {
373 int ret
= setup_next_fec_group(fc
, vsst
);
377 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
378 PARA_ERROR_LOG("FEC client temporarily disabled\n");
383 write_fec_header(fc
, vsst
);
384 fec_encode(fc
->parms
, fc
->src_data
, fc
->enc_buf
+ FEC_HEADER_SIZE
,
385 fc
->current_slice_num
,
386 fc
->fcp
->max_slice_bytes
- FEC_HEADER_SIZE
);
391 * Return a buffer that marks the end of the stream.
393 * \param buf Result pointer.
394 * \return The length of the eof buffer.
396 * This is used for (multicast) udp streaming where closing the socket on the
397 * sender might not give rise to an eof condition at the peer.
399 size_t vss_get_fec_eof_packet(const char **buf
)
401 static const char fec_eof_packet
[FEC_HEADER_SIZE
] = FEC_EOF_PACKET
;
402 *buf
= fec_eof_packet
;
403 return FEC_HEADER_SIZE
;
407 * Add one entry to the list of active fec clients.
409 * \param fcp Describes the fec parameters to be used for this client.
410 * \param result An opaque pointer that must be used by remove the client later.
414 int vss_add_fec_client(struct fec_client_parms
*fcp
, struct fec_client
**result
)
417 struct fec_client
*fc
;
419 if (fcp
->max_slice_bytes
< FEC_HEADER_SIZE
+ fcp
->data_slices_per_group
)
420 return -ERRNO_TO_PARA_ERROR(EINVAL
);
421 fc
= para_calloc(sizeof(*fc
));
423 ret
= fec_new(fcp
->data_slices_per_group
, fcp
->slices_per_group
,
427 fc
->first_stream_chunk
= -1; /* stream not yet started */
428 fc
->src_data
= para_malloc(fc
->fcp
->slices_per_group
* sizeof(char *));
429 fc
->enc_buf
= para_calloc(fc
->fcp
->max_slice_bytes
);
430 fc
->num_extra_slices
= 0;
431 fc
->extra_src_buf
= para_calloc(fc
->fcp
->max_slice_bytes
);
432 fc
->next_header_time
.tv_sec
= 0;
433 para_list_add(&fc
->node
, &fec_client_list
);
444 * Remove one entry from the list of active fec clients.
446 * \param fc The client to be removed.
448 void vss_del_fec_client(struct fec_client
*fc
)
453 free(fc
->extra_src_buf
);
459 * Compute if/when next slice is due. If it isn't due yet and \a diff is
460 * not \p Null, compute the time difference next - now, where
462 * next = stream_start + (first_group_chunk - first_stream_chunk)
463 * * chunk_time + slice_num * slice_time
465 static int next_slice_is_due(struct fec_client
*fc
, struct timeval
*diff
)
467 struct timeval tmp
, next
;
470 if (fc
->first_stream_chunk
< 0)
472 tv_scale(fc
->current_slice_num
, &fc
->group
.slice_duration
, &tmp
);
473 tv_add(&tmp
, &fc
->group
.start
, &next
);
474 ret
= tv_diff(&next
, now
, diff
);
475 return ret
< 0? 1 : 0;
478 static void compute_slice_timeout(struct timeval
*timeout
)
480 struct fec_client
*fc
;
482 assert(vss_playing());
483 list_for_each_entry(fc
, &fec_client_list
, node
) {
488 if (next_slice_is_due(fc
, &diff
)) {
490 timeout
->tv_usec
= 0;
493 /* timeout = min(timeout, diff) */
494 if (tv_diff(&diff
, timeout
, NULL
) < 0)
499 static void set_eof_barrier(struct vss_task
*vsst
)
501 struct fec_client
*fc
;
502 struct timeval timeout
= mmd
->afd
.afhi
.eof_tv
,
503 *chunk_tv
= vss_chunk_time();
507 list_for_each_entry(fc
, &fec_client_list
, node
) {
508 struct timeval group_duration
;
512 tv_scale(fc
->group
.num_chunks
, chunk_tv
, &group_duration
);
513 if (tv_diff(&timeout
, &group_duration
, NULL
) < 0)
514 timeout
= group_duration
;
517 tv_add(now
, &timeout
, &vsst
->eof_barrier
);
521 * Check if vss status flag \a P (playing) is set.
523 * \return Greater than zero if playing, zero otherwise.
526 unsigned int vss_playing(void)
528 return mmd
->new_vss_status_flags
& VSS_PLAYING
;
532 * Check if the \a N (next) status flag is set.
534 * \return Greater than zero if set, zero if not.
537 unsigned int vss_next(void)
539 return mmd
->new_vss_status_flags
& VSS_NEXT
;
543 * Check if a reposition request is pending.
545 * \return Greater than zero if true, zero otherwise.
548 unsigned int vss_repos(void)
550 return mmd
->new_vss_status_flags
& VSS_REPOS
;
554 * Check if the vss is currently paused.
556 * \return Greater than zero if paused, zero otherwise.
559 unsigned int vss_paused(void)
561 return !(mmd
->new_vss_status_flags
& VSS_NEXT
)
562 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
566 * Check if the vss is currently stopped.
568 * \return Greater than zero if paused, zero otherwise.
571 unsigned int vss_stopped(void)
573 return (mmd
->new_vss_status_flags
& VSS_NEXT
)
574 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
577 static int chk_barrier(const char *bname
, const struct timeval
*barrier
,
578 struct timeval
*diff
, int print_log
)
582 if (tv_diff(now
, barrier
, diff
) > 0)
586 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname
, ms
);
591 * != NULL: timeout for next chunk
592 * NULL: nothing to do
594 static struct timeval
*vss_compute_timeout(struct vss_task
*vsst
)
596 static struct timeval the_timeout
;
597 struct timeval next_chunk
;
599 if (vss_next() && vsst
->map
) {
600 /* only sleep a bit, nec*/
601 the_timeout
.tv_sec
= 0;
602 the_timeout
.tv_usec
= 100;
605 if (chk_barrier("autoplay_delay", &vsst
->autoplay_barrier
,
606 &the_timeout
, 1) < 0)
608 if (chk_barrier("eof", &vsst
->eof_barrier
, &the_timeout
, 1) < 0)
610 if (chk_barrier("data send", &vsst
->data_send_barrier
,
611 &the_timeout
, 1) < 0)
613 if (!vss_playing() || !vsst
->map
)
615 compute_chunk_time(mmd
->chunks_sent
, &mmd
->afd
.afhi
.chunk_tv
,
616 &mmd
->stream_start
, &next_chunk
);
617 if (chk_barrier("chunk", &next_chunk
, &the_timeout
, 0) >= 0) {
618 /* chunk is due or bof */
619 the_timeout
.tv_sec
= 0;
620 the_timeout
.tv_usec
= 0;
623 /* compute min of current timeout and next slice time */
624 compute_slice_timeout(&the_timeout
);
628 static void vss_eof(struct vss_task
*vsst
)
633 if (mmd
->new_vss_status_flags
& VSS_NOMORE
)
634 mmd
->new_vss_status_flags
= VSS_NEXT
;
635 set_eof_barrier(vsst
);
636 para_munmap(vsst
->map
, mmd
->size
);
638 mmd
->chunks_sent
= 0;
640 mmd
->afd
.afhi
.seconds_total
= 0;
641 mmd
->afd
.afhi
.chunk_tv
.tv_sec
= 0;
642 mmd
->afd
.afhi
.chunk_tv
.tv_usec
= 0;
643 free(mmd
->afd
.afhi
.chunk_table
);
644 mmd
->afd
.afhi
.chunk_table
= NULL
;
645 free(mmd
->afd
.afhi
.info_string
);
646 mmd
->afd
.afhi
.info_string
= make_message("%s:\n%s:\n%s:\n", status_item_list
[SI_AUDIO_FILE_INFO
],
647 status_item_list
[SI_TAGINFO1
], status_item_list
[SI_TAGINFO2
]);
648 make_empty_status_items(mmd
->afd
.verbose_ls_output
);
655 * Get the list of all supported audio formats.
657 * \return Aa space separated list of all supported audio formats
658 * It is not allocated at runtime, i.e. there is no need to free
659 * the returned string in the caller.
661 const char *supported_audio_formats(void)
663 return SUPPORTED_AUDIO_FORMATS
;
666 static int need_to_request_new_audio_file(struct vss_task
*vsst
)
670 if (vsst
->map
) /* have audio file */
672 if (!vss_playing()) /* don't need one */
674 if (mmd
->new_vss_status_flags
& VSS_NOMORE
)
676 if (vsst
->afsss
== AFS_SOCKET_AFD_PENDING
) /* already requested one */
678 if (chk_barrier("autoplay_delay", &vsst
->autoplay_barrier
,
685 * Compute the timeout for the main select-loop of the scheduler.
687 * \param s Pointer to the server scheduler.
688 * \param t Pointer to the vss task structure.
690 * Before the timeout is computed, the current vss status flags are evaluated
691 * and acted upon by calling appropriate functions from the lower layers.
692 * Possible actions include
694 * - request a new audio file from afs,
695 * - shutdown of all senders (stop/pause command),
696 * - reposition the stream (ff/jmp command).
698 static void vss_pre_select(struct sched
*s
, struct task
*t
)
701 struct timeval
*tv
, diff
;
702 struct vss_task
*vsst
= container_of(t
, struct vss_task
, task
);
704 if (!vsst
->map
|| vss_next() || vss_paused() || vss_repos()) {
705 struct fec_client
*fc
, *tmp
;
706 for (i
= 0; senders
[i
].name
; i
++)
707 if (senders
[i
].shutdown_clients
)
708 senders
[i
].shutdown_clients();
709 list_for_each_entry_safe(fc
, tmp
, &fec_client_list
, node
) {
710 fc
->first_stream_chunk
= -1;
713 mmd
->stream_start
.tv_sec
= 0;
714 mmd
->stream_start
.tv_usec
= 0;
718 else if (vss_paused()) {
719 if (mmd
->chunks_sent
)
720 set_eof_barrier(vsst
);
721 mmd
->chunks_sent
= 0;
722 } else if (vss_repos()) {
723 tv_add(now
, &vsst
->announce_tv
, &vsst
->data_send_barrier
);
724 set_eof_barrier(vsst
);
725 mmd
->chunks_sent
= 0;
726 mmd
->current_chunk
= mmd
->repos_request
;
727 mmd
->new_vss_status_flags
&= ~VSS_REPOS
;
729 if (need_to_request_new_audio_file(vsst
)) {
730 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
731 para_fd_set(vsst
->afs_socket
, &s
->wfds
, &s
->max_fileno
);
732 vsst
->afsss
= AFS_SOCKET_CHECK_FOR_WRITE
;
734 para_fd_set(vsst
->afs_socket
, &s
->rfds
, &s
->max_fileno
);
735 for (i
= 0; senders
[i
].name
; i
++) {
736 if (!senders
[i
].pre_select
)
738 senders
[i
].pre_select(&s
->max_fileno
, &s
->rfds
, &s
->wfds
);
740 tv
= vss_compute_timeout(vsst
);
741 if (tv
&& tv_diff(tv
, &s
->timeout
, &diff
) < 0)
745 static int recv_afs_msg(int afs_socket
, int *fd
, uint32_t *code
, uint32_t *data
)
747 char control
[255], buf
[8];
748 struct msghdr msg
= {.msg_iov
= NULL
};
749 struct cmsghdr
*cmsg
;
755 iov
.iov_len
= sizeof(buf
);
758 msg
.msg_control
= control
;
759 msg
.msg_controllen
= sizeof(control
);
760 memset(buf
, 0, sizeof(buf
));
761 ret
= recvmsg(afs_socket
, &msg
, 0);
763 return -ERRNO_TO_PARA_ERROR(errno
);
764 if (iov
.iov_len
!= sizeof(buf
))
765 return -E_AFS_SHORT_READ
;
766 *code
= *(uint32_t*)buf
;
767 *data
= *(uint32_t*)(buf
+ 4);
768 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
; cmsg
= CMSG_NXTHDR(&msg
, cmsg
)) {
769 if (cmsg
->cmsg_level
!= SOL_SOCKET
770 || cmsg
->cmsg_type
!= SCM_RIGHTS
)
772 if ((cmsg
->cmsg_len
- CMSG_LEN(0)) / sizeof(int) != 1)
774 *fd
= *(int *)CMSG_DATA(cmsg
);
779 static void recv_afs_result(struct vss_task
*vsst
)
781 int ret
, passed_fd
, shmid
;
782 uint32_t afs_code
= 0, afs_data
= 0;
785 vsst
->afsss
= AFS_SOCKET_READY
;
786 ret
= recv_afs_msg(vsst
->afs_socket
, &passed_fd
, &afs_code
, &afs_data
);
789 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd
, afs_code
,
792 if (afs_code
!= NEXT_AUDIO_FILE
)
797 free(mmd
->afd
.afhi
.info_string
);
798 ret
= load_afd(shmid
, &mmd
->afd
);
802 ret
= fstat(passed_fd
, &statbuf
);
804 PARA_ERROR_LOG("fstat error:\n");
805 ret
= -ERRNO_TO_PARA_ERROR(errno
);
808 mmd
->size
= statbuf
.st_size
;
809 mmd
->mtime
= statbuf
.st_mtime
;
810 ret
= para_mmap(mmd
->size
, PROT_READ
, MAP_PRIVATE
, passed_fd
,
815 mmd
->chunks_sent
= 0;
816 mmd
->current_chunk
= 0;
820 mmd
->new_vss_status_flags
&= (~VSS_NEXT
);
821 afh_get_header(&mmd
->afd
.afhi
, vsst
->map
, &vsst
->header_buf
,
825 free(mmd
->afd
.afhi
.chunk_table
);
828 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
829 mmd
->new_vss_status_flags
= VSS_NEXT
;
833 * Main sending function.
835 * This function gets called from vss_post_select(). It checks whether the next
836 * chunk of data should be pushed out. It obtains a pointer to the data to be
837 * sent out as well as its length from mmd->afd.afhi. This information is then
838 * passed to each supported sender's send() function as well as to the send()
839 * functions of each registered fec client.
841 static void vss_send(struct vss_task
*vsst
)
843 int i
, fec_active
= 0;
845 struct fec_client
*fc
, *tmp_fc
;
847 if (!vsst
->map
|| !vss_playing())
849 if (chk_barrier("eof", &vsst
->eof_barrier
, &due
, 1) < 0)
851 if (chk_barrier("data send", &vsst
->data_send_barrier
,
854 list_for_each_entry_safe(fc
, tmp_fc
, &fec_client_list
, node
) {
857 if (!next_slice_is_due(fc
, NULL
)) {
861 if (compute_next_fec_slice(fc
, vsst
) <= 0)
863 PARA_DEBUG_LOG("sending %d:%d (%u bytes)\n", fc
->group
.num
,
864 fc
->current_slice_num
, fc
->fcp
->max_slice_bytes
);
865 fc
->fcp
->send((char *)fc
->enc_buf
,
866 fc
->fcp
->max_slice_bytes
,
867 fc
->fcp
->private_data
);
868 fc
->current_slice_num
++;
871 if (mmd
->current_chunk
>= mmd
->afd
.afhi
.chunks_total
) { /* eof */
873 mmd
->new_vss_status_flags
|= VSS_NEXT
;
876 compute_chunk_time(mmd
->chunks_sent
, &mmd
->afd
.afhi
.chunk_tv
,
877 &mmd
->stream_start
, &due
);
878 if (tv_diff(&due
, now
, NULL
) <= 0) {
882 if (!mmd
->chunks_sent
) {
884 mmd
->stream_start
= *now
;
885 tv_scale(mmd
->current_chunk
, &mmd
->afd
.afhi
.chunk_tv
, &tmp
);
886 mmd
->offset
= tv2ms(&tmp
);
890 * We call the send function also in case of empty chunks as
891 * they might have still some data queued which can be sent in
894 afh_get_chunk(mmd
->current_chunk
, &mmd
->afd
.afhi
, vsst
->map
,
896 for (i
= 0; senders
[i
].name
; i
++) {
897 if (!senders
[i
].send
)
899 senders
[i
].send(mmd
->current_chunk
, mmd
->chunks_sent
,
900 buf
, len
, vsst
->header_buf
, vsst
->header_len
);
903 mmd
->current_chunk
++;
907 static void vss_post_select(struct sched
*s
, struct task
*t
)
910 struct vss_task
*vsst
= container_of(t
, struct vss_task
, task
);
913 if (mmd
->sender_cmd_data
.cmd_num
>= 0) {
914 int num
= mmd
->sender_cmd_data
.cmd_num
,
915 sender_num
= mmd
->sender_cmd_data
.sender_num
;
917 if (senders
[sender_num
].client_cmds
[num
])
918 senders
[sender_num
].client_cmds
[num
](&mmd
->sender_cmd_data
);
919 mmd
->sender_cmd_data
.cmd_num
= -1;
921 if (vsst
->afsss
!= AFS_SOCKET_CHECK_FOR_WRITE
) {
922 if (FD_ISSET(vsst
->afs_socket
, &s
->rfds
))
923 recv_afs_result(vsst
);
924 } else if (FD_ISSET(vsst
->afs_socket
, &s
->wfds
)) {
925 PARA_NOTICE_LOG("requesting new fd from afs\n");
926 ret
= send_buffer(vsst
->afs_socket
, "new");
928 PARA_CRIT_LOG("%s\n", para_strerror(-ret
));
930 vsst
->afsss
= AFS_SOCKET_AFD_PENDING
;
932 for (i
= 0; senders
[i
].name
; i
++) {
933 if (!senders
[i
].post_select
)
935 senders
[i
].post_select(&s
->rfds
, &s
->wfds
);
937 if ((vss_playing() && !(mmd
->vss_status_flags
& VSS_PLAYING
)) ||
938 (vss_next() && vss_playing()))
939 tv_add(now
, &vsst
->announce_tv
, &vsst
->data_send_barrier
);
944 * Initialize the virtual streaming system task.
946 * \param afs_socket The fd for communication with afs.
948 * This also initializes all supported senders and starts streaming
949 * if the --autoplay command line flag was given.
951 void init_vss_task(int afs_socket
)
953 static struct vss_task vss_task_struct
, *vsst
= &vss_task_struct
;
955 char *hn
= para_hostname(), *home
= para_homedir();
956 long unsigned announce_time
= conf
.announce_time_arg
> 0?
957 conf
.announce_time_arg
: 300,
958 autoplay_delay
= conf
.autoplay_delay_arg
> 0?
959 conf
.autoplay_delay_arg
: 0;
960 vsst
->header_interval
.tv_sec
= 5; /* should this be configurable? */
961 vsst
->afs_socket
= afs_socket
;
962 vsst
->task
.pre_select
= vss_pre_select
;
963 vsst
->task
.post_select
= vss_post_select
;
964 ms2tv(announce_time
, &vsst
->announce_tv
);
965 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&vsst
->announce_tv
));
966 INIT_LIST_HEAD(&fec_client_list
);
967 for (i
= 0; senders
[i
].name
; i
++) {
968 PARA_NOTICE_LOG("initializing %s sender\n", senders
[i
].name
);
969 senders
[i
].init(&senders
[i
]);
973 mmd
->sender_cmd_data
.cmd_num
= -1;
974 make_empty_status_items(mmd
->afd
.verbose_ls_output
);
975 if (conf
.autoplay_given
) {
977 mmd
->vss_status_flags
|= VSS_PLAYING
;
978 mmd
->new_vss_status_flags
|= VSS_PLAYING
;
979 ms2tv(autoplay_delay
, &tmp
);
980 tv_add(now
, &tmp
, &vsst
->autoplay_barrier
);
981 tv_add(&vsst
->autoplay_barrier
, &vsst
->announce_tv
,
982 &vsst
->data_send_barrier
);
984 register_task(&vsst
->task
);