2 * Copyright (C) 1997-2008 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
14 #include <sys/mman.h> /* mmap */
15 #include <sys/time.h> /* gettimeofday */
16 #include <sys/types.h>
26 #include "server.cmdline.h"
33 static struct timeval announce_tv
;
34 static struct timeval data_send_barrier
;
35 static struct timeval eof_barrier
;
36 static struct timeval autoplay_barrier
;
38 extern struct misc_meta_data
*mmd
;
39 extern struct sender senders
[];
44 * Check if vss status flag \a P (playing) is set.
46 * \return Greater than zero if playing, zero otherwise.
49 unsigned int vss_playing(void)
51 return mmd
->new_vss_status_flags
& VSS_PLAYING
;
55 * Check if the \a N (next) status flag is set.
57 * \return Greater than zero if set, zero if not.
60 unsigned int vss_next(void)
62 return mmd
->new_vss_status_flags
& VSS_NEXT
;
66 * Check if a reposition request is pending.
68 * \return Greater than zero if true, zero otherwise.
71 unsigned int vss_repos(void)
73 return mmd
->new_vss_status_flags
& VSS_REPOS
;
77 * Check if the vss is currently paused.
79 * \return Greater than zero if paused, zero otherwise.
82 unsigned int vss_paused(void)
84 return !(mmd
->new_vss_status_flags
& VSS_NEXT
)
85 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
89 * Check if the vss is currently stopped.
91 * \return Greater than zero if paused, zero otherwise.
94 unsigned int vss_stopped(void)
96 return (mmd
->new_vss_status_flags
& VSS_NEXT
)
97 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
101 * Get the data of the given chunk.
103 * \param chunk_num The number of the desired chunk.
104 * \param buf Chunk data.
105 * \param len Chunk length in bytes.
109 int vss_get_chunk(long unsigned chunk_num
, char **buf
, size_t *len
)
111 if (!map
|| !vss_playing())
113 if (chunk_num
>= mmd
->afd
.afhi
.chunks_total
)
115 afh_get_chunk(chunk_num
, &mmd
->afd
.afhi
, map
, buf
, len
);
120 * Initialize the virtual streaming system.
122 * This also initializes all supported senders and starts streaming
123 * if the --autoplay command line flag was given.
128 char *hn
= para_hostname(), *home
= para_homedir();
129 long unsigned announce_time
= conf
.announce_time_arg
> 0?
130 conf
.announce_time_arg
: 300,
131 autoplay_delay
= conf
.autoplay_delay_arg
> 0?
132 conf
.autoplay_delay_arg
: 0;
133 ms2tv(announce_time
, &announce_tv
);
134 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&announce_tv
));
135 for (i
= 0; senders
[i
].name
; i
++) {
136 PARA_NOTICE_LOG("initializing %s sender\n", senders
[i
].name
);
137 senders
[i
].init(&senders
[i
]);
141 if (conf
.autoplay_given
) {
142 struct timeval now
, tmp
;
143 mmd
->vss_status_flags
|= VSS_PLAYING
;
144 mmd
->new_vss_status_flags
|= VSS_PLAYING
;
145 gettimeofday(&now
, NULL
);
146 ms2tv(autoplay_delay
, &tmp
);
147 tv_add(&now
, &tmp
, &autoplay_barrier
);
151 static int chk_barrier(const char *bname
, const struct timeval
*now
,
152 const struct timeval
*barrier
, struct timeval
*diff
,
157 if (tv_diff(now
, barrier
, diff
) > 0)
161 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname
, ms
);
166 * != NULL: timeout for next chunk
167 * NULL: nothing to do
169 static struct timeval
*vss_compute_timeout(void)
171 static struct timeval the_timeout
;
172 struct timeval now
, next_chunk
;
174 if (vss_next() && map
) {
175 /* only sleep a bit, nec*/
176 the_timeout
.tv_sec
= 0;
177 the_timeout
.tv_usec
= 100;
180 gettimeofday(&now
, NULL
);
181 if (chk_barrier("autoplay_delay", &now
, &autoplay_barrier
,
182 &the_timeout
, 1) < 0)
184 if (chk_barrier("eof", &now
, &eof_barrier
, &the_timeout
, 1) < 0)
186 if (chk_barrier("data send", &now
, &data_send_barrier
,
187 &the_timeout
, 1) < 0)
189 if (!vss_playing() || !map
)
191 compute_chunk_time(mmd
->chunks_sent
, &mmd
->afd
.afhi
.chunk_tv
,
192 &mmd
->stream_start
, &next_chunk
);
193 if (chk_barrier("chunk", &now
, &next_chunk
, &the_timeout
, 0) < 0)
195 /* chunk is due or bof */
196 the_timeout
.tv_sec
= 0;
197 the_timeout
.tv_usec
= 0;
201 static void vss_eof(void)
206 if (mmd
->new_vss_status_flags
& VSS_NOMORE
)
207 mmd
->new_vss_status_flags
= VSS_NEXT
;
208 gettimeofday(&now
, NULL
);
209 tv_add(&mmd
->afd
.afhi
.eof_tv
, &now
, &eof_barrier
);
210 munmap(map
, mmd
->size
);
212 mmd
->chunks_sent
= 0;
214 mmd
->afd
.afhi
.seconds_total
= 0;
215 free(mmd
->afd
.afhi
.chunk_table
);
216 mmd
->afd
.afhi
.chunk_table
= NULL
;
217 tmp
= make_message("%s:\n%s:\n%s:\n", status_item_list
[SI_AUDIO_FILE_INFO
],
218 status_item_list
[SI_TAGINFO1
], status_item_list
[SI_TAGINFO2
]);
219 strncpy(mmd
->afd
.afhi
.info_string
, tmp
, sizeof(mmd
->afd
.afhi
.info_string
));
220 mmd
->afd
.afhi
.info_string
[sizeof(mmd
->afd
.afhi
.info_string
) - 1] = '\0';
221 make_empty_status_items(mmd
->afd
.verbose_ls_output
);
229 * Get the header of the current audio file.
231 * \param buf The length of the header is stored here.
232 * \param len Points to a buffer containing the header on return.
234 * \sa afh_get_header.
236 void vss_get_header(char **buf
, size_t *len
)
238 afh_get_header(&mmd
->afd
.afhi
, map
, buf
, len
);
242 * Get the list of all supported audio formats.
244 * \return Aa space separated list of all supported audio formats
245 * It is not allocated at runtime, i.e. there is no need to free
246 * the returned string in the caller.
248 const char *supported_audio_formats(void)
250 return SUPPORTED_AUDIO_FORMATS
;
254 * Get the chunk time of the current audio file.
256 * \return A pointer to a struct containing the chunk time, or NULL,
257 * if currently no audio file is selected.
259 struct timeval
*vss_chunk_time(void)
263 return &mmd
->afd
.afhi
.chunk_tv
;
266 /** The possible states of the afs socket. See \ref afs_socket. */
267 enum afs_socket_status
{
268 /** Socket is inactive. */
270 /** Socket fd was included in the write fd set for select(). */
271 AFS_SOCKET_CHECK_FOR_WRITE
,
272 /** vss wrote a request to the socket and waits for afs to reply. */
273 AFS_SOCKET_AFD_PENDING
276 static enum afs_socket_status afsss
;
278 static int need_to_request_new_audio_file(void)
280 if (map
) /* have audio file */
282 if (!vss_playing()) /* don't need one */
284 if (mmd
->new_vss_status_flags
& VSS_NOMORE
)
286 if (afsss
== AFS_SOCKET_AFD_PENDING
) /* already requested one */
292 * Compute the timeout for para_server's main select-loop.
294 * This function gets called from para_server to determine the timeout value
295 * for its main select loop.
297 * \param rfds The set of file descriptors to be checked for reading.
298 * \param wfds The set of file descriptors to be checked for writing.
299 * \param max_fileno The highest-numbered file descriptor.
301 * Before the timeout is computed, the current vss status flags are evaluated
302 * and acted upon by calling appropriate functions from the lower layers.
303 * Possible actions include
305 * - request a new audio file from afs,
306 * - shutdown of all senders (stop/pause command),
307 * - reposition the stream (ff/jmp command).
309 * \return A pointer to a struct timeval containing the timeout for the next
310 * chunk of data to be sent, or NULL if we're not sending right now.
312 struct timeval
*vss_preselect(fd_set
*rfds
, fd_set
*wfds
, int *max_fileno
)
317 if (!map
|| vss_next() || vss_paused() || vss_repos())
318 for (i
= 0; senders
[i
].name
; i
++)
319 senders
[i
].shutdown_clients();
322 else if (vss_paused()) {
323 if (mmd
->chunks_sent
) {
324 gettimeofday(&now
, NULL
);
325 tv_add(&mmd
->afd
.afhi
.eof_tv
, &now
, &eof_barrier
);
327 mmd
->chunks_sent
= 0;
328 } else if (vss_repos()) {
329 gettimeofday(&now
, NULL
);
330 tv_add(&now
, &announce_tv
, &data_send_barrier
);
331 tv_add(&mmd
->afd
.afhi
.eof_tv
, &now
, &eof_barrier
);
332 mmd
->chunks_sent
= 0;
333 mmd
->current_chunk
= mmd
->repos_request
;
334 mmd
->new_vss_status_flags
&= ~VSS_REPOS
;
337 if (need_to_request_new_audio_file()) {
338 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
339 para_fd_set(afs_socket
, wfds
, max_fileno
);
340 afsss
= AFS_SOCKET_CHECK_FOR_WRITE
;
342 para_fd_set(afs_socket
, rfds
, max_fileno
);
343 for (i
= 0; senders
[i
].name
; i
++) {
344 if (!senders
[i
].pre_select
)
346 senders
[i
].pre_select(max_fileno
, rfds
, wfds
);
348 return vss_compute_timeout();
351 static int recv_afs_msg(int *fd
, uint32_t *code
, uint32_t *data
)
353 char control
[255], buf
[8];
354 struct msghdr msg
= {.msg_iov
= NULL
};
355 struct cmsghdr
*cmsg
;
361 iov
.iov_len
= sizeof(buf
);
364 msg
.msg_control
= control
;
365 msg
.msg_controllen
= sizeof(control
);
366 memset(buf
, 0, sizeof(buf
));
367 ret
= recvmsg(afs_socket
, &msg
, 0);
369 return -ERRNO_TO_PARA_ERROR(errno
);
370 afsss
= AFS_SOCKET_READY
;
371 if (iov
.iov_len
!= sizeof(buf
))
372 return -E_AFS_SHORT_READ
;
373 *code
= *(uint32_t*)buf
;
374 *data
= *(uint32_t*)(buf
+ 4);
375 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
; cmsg
= CMSG_NXTHDR(&msg
, cmsg
)) {
376 if (cmsg
->cmsg_level
!= SOL_SOCKET
377 || cmsg
->cmsg_type
!= SCM_RIGHTS
)
379 if ((cmsg
->cmsg_len
- CMSG_LEN(0)) / sizeof(int) != 1)
381 *fd
= *(int *)CMSG_DATA(cmsg
);
386 static void recv_afs_result(void)
388 int ret
, passed_fd
, shmid
;
389 uint32_t afs_code
= 0, afs_data
= 0;
393 mmd
->afd
.afhi
.chunk_table
= NULL
;
394 ret
= recv_afs_msg(&passed_fd
, &afs_code
, &afs_data
);
397 PARA_DEBUG_LOG("fd: %d, code: %u, shmid: %u\n", passed_fd
, afs_code
,
400 if (afs_code
!= NEXT_AUDIO_FILE
)
405 ret
= load_afd(shmid
, &mmd
->afd
);
409 ret
= fstat(passed_fd
, &statbuf
);
411 PARA_ERROR_LOG("fstat error:\n");
412 ret
= -ERRNO_TO_PARA_ERROR(errno
);
415 mmd
->size
= statbuf
.st_size
;
416 mmd
->mtime
= statbuf
.st_mtime
;
417 map
= para_mmap(mmd
->size
, PROT_READ
, MAP_PRIVATE
,
420 mmd
->chunks_sent
= 0;
421 mmd
->current_chunk
= 0;
425 mmd
->new_vss_status_flags
&= (~VSS_NEXT
);
426 gettimeofday(&now
, NULL
);
427 tv_add(&now
, &announce_tv
, &data_send_barrier
);
430 free(mmd
->afd
.afhi
.chunk_table
);
433 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
434 mmd
->new_vss_status_flags
= VSS_NEXT
;
438 * Main sending function.
440 * This function gets called from para_server as soon as the next chunk of data
441 * should be pushed out. It obtains a pointer to the data to be sent out as
442 * well as its length from mmd->afd.afhi. This information is then passed to
443 * each supported sender's send() function which is supposed to send out the data
444 * to all connected clients.
446 static void vss_send_chunk(void)
449 struct timeval now
, due
;
453 if (!map
|| !vss_playing())
455 gettimeofday(&now
, NULL
);
456 compute_chunk_time(mmd
->chunks_sent
, &mmd
->afd
.afhi
.chunk_tv
,
457 &mmd
->stream_start
, &due
);
458 if (tv_diff(&due
, &now
, NULL
) > 0)
460 if (chk_barrier("eof", &now
, &eof_barrier
, &due
, 1) < 0)
462 if (chk_barrier("data send", &now
, &data_send_barrier
,
465 mmd
->new_vss_status_flags
&= ~VSS_REPOS
;
466 if (mmd
->current_chunk
>= mmd
->afd
.afhi
.chunks_total
) { /* eof */
467 mmd
->new_vss_status_flags
|= VSS_NEXT
;
471 * We call the send function also in case of empty chunks as they
472 * might have still some data queued which can be sent in this case.
474 if (!mmd
->chunks_sent
) {
476 gettimeofday(&mmd
->stream_start
, NULL
);
477 tv_scale(mmd
->current_chunk
, &mmd
->afd
.afhi
.chunk_tv
, &tmp
);
478 mmd
->offset
= tv2ms(&tmp
);
481 afh_get_chunk(mmd
->current_chunk
, &mmd
->afd
.afhi
, map
, &buf
, &len
);
482 for (i
= 0; senders
[i
].name
; i
++)
483 senders
[i
].send(mmd
->current_chunk
, mmd
->chunks_sent
, buf
, len
);
484 mmd
->new_vss_status_flags
|= VSS_PLAYING
;
486 mmd
->current_chunk
++;
489 void vss_post_select(fd_set
*rfds
, fd_set
*wfds
)
493 if (afsss
!= AFS_SOCKET_CHECK_FOR_WRITE
) {
494 if (FD_ISSET(afs_socket
, rfds
))
496 } else if (FD_ISSET(afs_socket
, wfds
)) {
497 PARA_NOTICE_LOG("requesting new fd from afs\n");
498 ret
= send_buffer(afs_socket
, "new");
499 afsss
= AFS_SOCKET_AFD_PENDING
;
501 for (i
= 0; senders
[i
].name
; i
++) {
502 if (!senders
[i
].post_select
)
504 senders
[i
].post_select(rfds
, wfds
);