2 * Copyright (C) 1997-2007 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"
32 extern const char *status_item_list
[];
34 static struct timeval announce_tv
;
35 static struct timeval data_send_barrier
;
36 static struct timeval eof_barrier
;
37 static struct timeval autoplay_barrier
;
39 extern struct misc_meta_data
*mmd
;
40 extern struct sender senders
[];
45 * Check if vss status flag \a P (playing) is set.
47 * \return Greater than zero if playing, zero otherwise.
50 unsigned int vss_playing(void)
52 return mmd
->new_vss_status_flags
& VSS_PLAYING
;
56 * Check if the \a N (next) status flag is set.
58 * \return Greater than zero if set, zero if not.
61 unsigned int vss_next(void)
63 return mmd
->new_vss_status_flags
& VSS_NEXT
;
67 * Check if a reposition request is pending.
69 * \return Greater than zero if true, zero otherwise.
72 unsigned int vss_repos(void)
74 return mmd
->new_vss_status_flags
& VSS_REPOS
;
78 * Check if the vss is currently paused.
80 * \return Greater than zero if paused, zero otherwise.
83 unsigned int vss_paused(void)
85 return !(mmd
->new_vss_status_flags
& VSS_NEXT
)
86 && !(mmd
->new_vss_status_flags
& VSS_PLAYING
);
90 * Initialize the virtual streaming system.
92 * This also initializes all supported senders and starts streaming
93 * if the --autoplay command line flag was given.
98 char *hn
= para_hostname(), *home
= para_homedir();
99 long unsigned announce_time
= conf
.announce_time_arg
> 0?
100 conf
.announce_time_arg
: 300,
101 autoplay_delay
= conf
.autoplay_delay_arg
> 0?
102 conf
.autoplay_delay_arg
: 0;
103 ms2tv(announce_time
, &announce_tv
);
104 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&announce_tv
));
105 for (i
= 0; senders
[i
].name
; i
++) {
106 PARA_NOTICE_LOG("initializing %s sender\n", senders
[i
].name
);
107 senders
[i
].init(&senders
[i
]);
111 if (conf
.autoplay_given
) {
112 struct timeval now
, tmp
;
113 mmd
->vss_status_flags
|= VSS_PLAYING
;
114 mmd
->new_vss_status_flags
|= VSS_PLAYING
;
115 gettimeofday(&now
, NULL
);
116 ms2tv(autoplay_delay
, &tmp
);
117 tv_add(&now
, &tmp
, &autoplay_barrier
);
121 static int chk_barrier(const char *bname
, const struct timeval
*now
,
122 const struct timeval
*barrier
, struct timeval
*diff
,
127 if (tv_diff(now
, barrier
, diff
) > 0)
131 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname
, ms
);
135 static void vss_next_chunk_time(struct timeval
*due
)
139 tv_scale(mmd
->chunks_sent
, &mmd
->afd
.afhi
.chunk_tv
, &tmp
);
140 tv_add(&tmp
, &mmd
->stream_start
, due
);
144 * != NULL: timeout for next chunk
145 * NULL: nothing to do
147 static struct timeval
*vss_compute_timeout(void)
149 static struct timeval the_timeout
;
150 struct timeval now
, next_chunk
;
152 if (vss_next() && map
) {
153 /* only sleep a bit, nec*/
154 the_timeout
.tv_sec
= 0;
155 the_timeout
.tv_usec
= 100;
158 gettimeofday(&now
, NULL
);
159 if (chk_barrier("autoplay_delay", &now
, &autoplay_barrier
,
160 &the_timeout
, 1) < 0)
162 if (chk_barrier("eof", &now
, &eof_barrier
, &the_timeout
, 1) < 0)
164 if (chk_barrier("data send", &now
, &data_send_barrier
,
165 &the_timeout
, 1) < 0)
167 if (!vss_playing() || !map
)
169 vss_next_chunk_time(&next_chunk
);
170 if (chk_barrier(audio_format_name(mmd
->afd
.afsi
.audio_format_id
),
171 &now
, &next_chunk
, &the_timeout
, 0) < 0)
173 /* chunk is due or bof */
174 the_timeout
.tv_sec
= 0;
175 the_timeout
.tv_usec
= 0;
179 static void vss_eof(void)
186 for (i
= 0; senders
[i
].name
; i
++)
187 senders
[i
].shutdown_clients();
190 gettimeofday(&now
, NULL
);
191 tv_add(&mmd
->afd
.afhi
.eof_tv
, &now
, &eof_barrier
);
192 munmap(map
, mmd
->size
);
194 mmd
->chunks_sent
= 0;
196 mmd
->afd
.afhi
.seconds_total
= 0;
197 free(mmd
->afd
.afhi
.chunk_table
);
198 mmd
->afd
.afhi
.chunk_table
= NULL
;
199 tmp
= make_message("%s:\n%s:\n%s:\n", status_item_list
[SI_AUDIO_INFO1
],
200 status_item_list
[SI_AUDIO_INFO2
], status_item_list
[SI_AUDIO_INFO3
]);
201 strncpy(mmd
->afd
.afhi
.info_string
, tmp
, sizeof(mmd
->afd
.afhi
.info_string
));
202 mmd
->afd
.afhi
.info_string
[sizeof(mmd
->afd
.afhi
.info_string
) - 1] = '\0';
204 mmd
->afd
.path
[0] = '\0';
205 mmd
->afd
.afsi
.lyrics_id
= 0;
206 mmd
->afd
.afsi
.image_id
= 0;
208 mmd
->afd
.attributes_string
[0] = '\0';
214 * Get the header of the current audio file.
216 * \param header_len The length of the header is stored here.
218 * \return A pointer to a buffer containing the header, or NULL, if no audio
219 * file is selected or if the current audio format does not need special header
223 char *vss_get_header(size_t *header_len
)
225 if (!map
|| !mmd
->afd
.afhi
.header_len
)
227 *header_len
= mmd
->afd
.afhi
.header_len
;
228 return map
+ mmd
->afd
.afhi
.header_offset
;
232 * Get the list of all supported audio formats.
234 * \return Aa space separated list of all supported audio formats
235 * It is not allocated at runtime, i.e. there is no need to free
236 * the returned string in the caller.
238 const char *supported_audio_formats(void)
240 return SUPPORTED_AUDIO_FORMATS
;
244 * Get the chunk time of the current audio file.
246 * \return A pointer to a struct containing the chunk time, or NULL,
247 * if currently no audio file is selected.
249 struct timeval
*vss_chunk_time(void)
253 return &mmd
->afd
.afhi
.chunk_tv
;
256 enum afs_socket_status
{
258 AFS_SOCKET_CHECK_FOR_WRITE
,
259 AFS_SOCKET_AFD_PENDING
262 static enum afs_socket_status afsss
;
265 * Compute the timeout for para_server's main select-loop.
267 * This function gets called from para_server to determine the timeout value
268 * for its main select loop.
270 * \param rfds The set of file descriptors to be checked for reading.
271 * \param wfds The set of file descriptors to be checked for writing.
272 * \param max_fileno The highest-numbered file descriptor.
274 * Before the timeout is computed, the current vss status flags are evaluated
275 * and acted upon by calling appropriate functions from the lower layers.
276 * Possible actions include
278 * - request a new audio file from afs,
279 * - shutdown of all senders (stop/pause command),
280 * - reposition the stream (ff/jmp command).
282 * \return A pointer to a struct timeval containing the timeout for the next
283 * chunk of data to be sent, or NULL if we're not sending right now.
285 struct timeval
*vss_preselect(fd_set
*rfds
, fd_set
*wfds
, int *max_fileno
)
290 para_fd_set(afs_socket
, rfds
, max_fileno
);
292 for (i
= 0; senders
[i
].name
; i
++)
293 senders
[i
].shutdown_clients();
297 return vss_compute_timeout();
300 if (vss_paused() || vss_repos()) {
301 for (i
= 0; senders
[i
].name
; i
++)
302 senders
[i
].shutdown_clients();
305 gettimeofday(&now
, NULL
);
306 if (!vss_paused() || mmd
->chunks_sent
)
307 tv_add(&mmd
->afd
.afhi
.eof_tv
, &now
, &eof_barrier
);
309 tv_add(&now
, &announce_tv
, &data_send_barrier
);
310 if (mmd
->new_vss_status_flags
& VSS_NOMORE
)
311 mmd
->new_vss_status_flags
= VSS_NEXT
;
313 mmd
->chunks_sent
= 0;
316 mmd
->new_vss_status_flags
&= ~(VSS_REPOS
);
317 mmd
->current_chunk
= mmd
->repos_request
;
319 tv
= vss_compute_timeout();
322 if (!map
&& vss_playing() &&
323 !(mmd
->new_vss_status_flags
& VSS_NOMORE
)) {
324 if (afsss
== AFS_SOCKET_READY
) {
325 PARA_DEBUG_LOG("ready and playing, but no audio file\n");
326 para_fd_set(afs_socket
, wfds
, max_fileno
);
327 afsss
= AFS_SOCKET_CHECK_FOR_WRITE
;
333 static int recv_afs_msg(int *fd
, uint32_t *code
, uint32_t *data
)
335 char control
[255], buf
[8];
336 struct msghdr msg
= {.msg_iov
= NULL
};
337 struct cmsghdr
*cmsg
;
342 iov
.iov_len
= sizeof(buf
);
345 msg
.msg_control
= control
;
346 msg
.msg_controllen
= sizeof(control
);
347 memset(buf
, 0, sizeof(buf
));
348 ret
= recvmsg(afs_socket
, &msg
, 0);
350 return -ERRNO_TO_PARA_ERROR(errno
);
351 if (iov
.iov_len
!= sizeof(buf
))
352 return -E_SHORT_AFS_READ
;
353 *code
= *(uint32_t*)buf
;
354 *data
= *(uint32_t*)(buf
+ 4);
355 for (cmsg
= CMSG_FIRSTHDR(&msg
); cmsg
; cmsg
= CMSG_NXTHDR(&msg
, cmsg
)) {
356 if (cmsg
->cmsg_level
!= SOL_SOCKET
357 || cmsg
->cmsg_type
!= SCM_RIGHTS
)
359 if ((cmsg
->cmsg_len
- CMSG_LEN(0)) / sizeof(int) != 1)
361 *fd
= *(int *)CMSG_DATA(cmsg
);
366 static void recv_afs_result(void)
368 int ret
, passed_fd
= -1, shmid
;
369 uint32_t afs_code
= 0, afs_data
= 0;
373 ret
= recv_afs_msg(&passed_fd
, &afs_code
, &afs_data
);
376 PARA_DEBUG_LOG("got the fd: %d, code: %u, shmid: %u\n",
377 passed_fd
, afs_code
, afs_data
);
378 ret
= -E_BAD_AFS_CODE
;
379 if (afs_code
!= NEXT_AUDIO_FILE
)
381 afsss
= AFS_SOCKET_READY
;
383 ret
= load_afd(shmid
, &mmd
->afd
);
387 PARA_NOTICE_LOG("next audio file: %s (%lu chunks)\n", mmd
->afd
.path
,
388 mmd
->afd
.afhi
.chunks_total
);
389 ret
= fstat(passed_fd
, &statbuf
);
391 PARA_ERROR_LOG("fstat error:\n");
392 ret
= -ERRNO_TO_PARA_ERROR(errno
);
395 mmd
->size
= statbuf
.st_size
;
396 mmd
->mtime
= statbuf
.st_mtime
;
397 map
= para_mmap(mmd
->size
, PROT_READ
, MAP_PRIVATE
,
400 mmd
->afd
.afhi
.header_len
= 0; /* default: no header */
401 mmd
->chunks_sent
= 0;
402 mmd
->current_chunk
= 0;
406 mmd
->new_vss_status_flags
&= (~VSS_NEXT
);
407 gettimeofday(&now
, NULL
);
408 tv_add(&now
, &announce_tv
, &data_send_barrier
);
413 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));
416 void vss_post_select(fd_set
*rfds
, fd_set
*wfds
)
420 if (FD_ISSET(afs_socket
, rfds
))
422 if (afsss
!= AFS_SOCKET_CHECK_FOR_WRITE
|| !FD_ISSET(afs_socket
, wfds
))
424 PARA_NOTICE_LOG("requesting new fd from afs\n");
425 ret
= send_buffer(afs_socket
, "new");
426 afsss
= AFS_SOCKET_AFD_PENDING
;
429 static void get_chunk(long unsigned chunk_num
, char **buf
, size_t *len
)
431 size_t pos
= mmd
->afd
.afhi
.chunk_table
[chunk_num
];
433 *len
= mmd
->afd
.afhi
.chunk_table
[chunk_num
+ 1] - pos
;
437 * Get the data of the given chunk.
439 * \param chunk_num The number of the desired chunk.
440 * \param buf Chunk data.
441 * \param len Chunk length in bytes.
445 int vss_get_chunk(long unsigned chunk_num
, char **buf
, size_t *len
)
447 if (!map
|| !vss_playing())
449 if (chunk_num
>= mmd
->afd
.afhi
.chunks_total
)
451 get_chunk(chunk_num
, buf
, len
);
456 * Main sending function.
458 * This function gets called from para_server as soon as the next chunk of data
459 * should be pushed out. It obtains a pointer to the data to be sent out as
460 * well as its length from mmd->afd.afhi. This information is then passed to
461 * each supported sender's send() function which is supposed to send out the data
462 * to all connected clients.
464 void vss_send_chunk(void)
467 struct timeval now
, due
;
471 if (!map
|| !vss_playing())
473 gettimeofday(&now
, NULL
);
474 vss_next_chunk_time(&due
);
475 if (tv_diff(&due
, &now
, NULL
) > 0)
477 if (chk_barrier("eof", &now
, &eof_barrier
, &due
, 1) < 0)
479 if (chk_barrier("data send", &now
, &data_send_barrier
,
482 mmd
->new_vss_status_flags
&= ~VSS_REPOS
;
483 if (mmd
->current_chunk
>= mmd
->afd
.afhi
.chunks_total
) { /* eof */
484 mmd
->new_vss_status_flags
|= VSS_NEXT
;
488 * We call the send function also in case of empty chunks as they
489 * might have still some data queued which can be sent in this case.
491 if (!mmd
->chunks_sent
) {
493 gettimeofday(&mmd
->stream_start
, NULL
);
494 tv_scale(mmd
->current_chunk
, &mmd
->afd
.afhi
.chunk_tv
, &tmp
);
495 mmd
->offset
= tv2ms(&tmp
);
498 get_chunk(mmd
->current_chunk
, &buf
, &len
);
499 for (i
= 0; senders
[i
].name
; i
++)
500 senders
[i
].send(mmd
->current_chunk
, mmd
->chunks_sent
, buf
, len
);
501 mmd
->new_vss_status_flags
|= VSS_PLAYING
;
503 mmd
->current_chunk
++;