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
17 #include <sys/mman.h> /* mmap */
18 #include <sys/time.h> /* gettimeofday */
19 #include "server.cmdline.h"
20 #include "afs_common.h"
27 extern const char *status_item_list[];
29 static struct timeval announce_tv;
30 static struct timeval data_send_barrier;
31 static struct timeval eof_barrier;
32 static struct timeval autoplay_barrier;
34 extern struct misc_meta_data *mmd;
35 extern struct audio_file_selector selectors[];
36 extern struct sender senders[];
38 static int audio_file;
41 /* The mp3 audio format handler does not need any libs. */
42 void mp3_init(struct audio_format_handler *);
45 void ogg_init(struct audio_format_handler *);
48 void aac_afh_init(struct audio_format_handler *);
52 * The list of supported audio formats.
54 * We always define the full array of audio formats even if some audio formats
55 * were not compiled in. This is because for each audio file the number of its
56 * audio format is stored in the databse. We don't want that numbers to become
57 * stale just because the user installed a new version of paraslash that
58 * supports a different set of audio formats.
60 * It can still be easily detected whether an audio format is compiled in by
61 * checking if the init function pointer is not \p NULL.
63 static struct audio_format_handler afl[] = {
85 static inline int next_audio_format(int format)
88 if (!afl[format].name)
97 /** Iterate over each supported audio format. */
98 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i = next_audio_format(i))
102 * check if vss status flag \a P (playing) is set
104 * \return greater than zero if playing, zero otherwise.
107 unsigned int vss_playing(void)
109 return mmd->new_vss_status_flags & VSS_PLAYING;
113 * check if \a N (next) status flag is set
115 * \return greater than zero if set, zero if not.
118 unsigned int vss_next(void)
120 return mmd->new_vss_status_flags & VSS_NEXT;
124 * check if a reposition request is pending
126 * \return greater than zero if true, zero otherwise.
129 unsigned int vss_repos(void)
131 return mmd->new_vss_status_flags & VSS_REPOS;
135 * check if the vss is currently paused
137 * \return greater than zero if paused, zero otherwise.
140 unsigned int vss_paused(void)
142 return !(mmd->new_vss_status_flags & VSS_NEXT)
143 && !(mmd->new_vss_status_flags & VSS_PLAYING);
147 * Get the name of the given audio format.
149 * \param i The audio format number.
151 * This returns a pointer to statically allocated memory so it
152 * must not be freed by the caller.
154 const char *audio_format_name(int i)
156 assert(i >= 0 && i < ARRAY_SIZE(afl));
161 * initialize the virtual streaming system
163 * Call the init functions of all supported audio format handlers and
164 * initialize all supported senders.
169 char *hn = para_hostname(), *home = para_homedir();
170 long unsigned announce_time = conf.announce_time_arg > 0?
171 conf.announce_time_arg : 300,
172 autoplay_delay = conf.autoplay_delay_arg > 0?
173 conf.autoplay_delay_arg : 0;
175 PARA_DEBUG_LOG("supported audio formats: %s\n",
176 SUPPORTED_AUDIO_FORMATS);
177 FOR_EACH_AUDIO_FORMAT(i) {
178 PARA_NOTICE_LOG("initializing %s handler\n",
180 afl[i].init(&afl[i]);
182 ms2tv(announce_time, &announce_tv);
183 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&announce_tv));
184 for (i = 0; senders[i].name; i++) {
185 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
186 senders[i].init(&senders[i]);
190 if (conf.autoplay_given) {
191 struct timeval now, tmp;
192 mmd->vss_status_flags |= VSS_PLAYING;
193 mmd->new_vss_status_flags |= VSS_PLAYING;
194 gettimeofday(&now, NULL);
195 ms2tv(autoplay_delay, &tmp);
196 tv_add(&now, &tmp, &autoplay_barrier);
200 static int get_file_info(int i)
202 return afl[i].get_file_info(map, mmd->size, &mmd->afi);
206 * guess the audio format judging from filename
208 * \param name the filename
210 * \return This function returns -1 if it has no idea what kind of audio
211 * file this might be. Otherwise the (non-negative) number of the audio format
214 int guess_audio_format(const char *name)
216 int i,j, len = strlen(name);
218 FOR_EACH_AUDIO_FORMAT(i) {
219 for (j = 0; afl[i].suffixes[j]; j++) {
220 const char *p = afl[i].suffixes[j];
221 int plen = strlen(p);
224 if (name[len - plen - 1] != '.')
226 if (strcasecmp(name + len - plen, p))
228 // PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
235 static int get_audio_format(int omit)
239 FOR_EACH_AUDIO_FORMAT(i) {
242 if (get_file_info(i) > 0)
245 return -E_AUDIO_FORMAT;
249 * Call get_file_info() to obtain an afhi structure.
251 * \param path The full path of the audio file.
252 * \param data Pointer to the contents of the (mapped) file.
253 * \param size The file size in bytes.
254 * \param afhi Result pointer.
256 * \return The number of the audio format on success, \p -E_AUDIO_FORMAT if no
257 * compiled in audio format handler is able to handler the file.
259 * This function tries to find an audio format handler that can interpret the
260 * file given by \a data and \a size.
262 * It first tries to determine the audio format from the filename given by \a
263 * path. If this doesn't work, all other audio format handlers are tried until
264 * one is found that can handle the file.
266 int compute_afhi(const char *path, char *data, size_t size,
267 struct audio_format_info *afhi)
269 int ret, i, format = guess_audio_format(path);
272 ret = afl[format].get_file_info(data, size, afhi);
276 FOR_EACH_AUDIO_FORMAT(i) {
277 if (i == format) /* we already tried this one to no avail */
279 ret = afl[i].get_file_info(data, size, afhi);
282 PARA_WARNING_LOG("%s\n", PARA_STRERROR(-ret));
284 return -E_AUDIO_FORMAT;
290 static int update_mmd(void)
294 i = guess_audio_format(mmd->filename);
295 if (i < 0 || get_file_info(i) < 0)
296 i = get_audio_format(i);
299 mmd->audio_format = i;
300 mmd->chunks_sent = 0;
301 mmd->current_chunk = 0;
307 static void vss_get_audio_file(void)
309 char **sl = selectors[mmd->selector_num].get_audio_file_list(10);
311 struct stat file_status;
315 for (i = 0; sl[i]; i++) {
317 PARA_INFO_LOG("trying %s\n", sl[i]);
318 if (strlen(sl[i]) >= _POSIX_PATH_MAX)
320 audio_file = open(sl[i], O_RDONLY);
323 if (fstat(audio_file, &file_status) == -1 ||
324 !file_status.st_size) {
328 mmd->size = file_status.st_size;
329 mmd->mtime = file_status.st_mtime;
330 map = para_mmap(mmd->size, PROT_READ, MAP_PRIVATE,
332 strcpy(mmd->filename, sl[i]);
333 mmd->afi.header_len = 0; /* default: no header */
334 if (update_mmd() < 0) { /* invalid file */
336 munmap(map, mmd->size);
341 if (selectors[mmd->selector_num].update_audio_file)
342 selectors[mmd->selector_num].update_audio_file(sl[i]);
343 PARA_NOTICE_LOG("next audio file: %s\n", mmd->filename);
344 mmd->new_vss_status_flags &= (~VSS_NEXT);
345 gettimeofday(&now, NULL);
346 tv_add(&now, &announce_tv, &data_send_barrier);
350 PARA_ERROR_LOG("%s", "no valid files found\n");
351 mmd->new_vss_status_flags = VSS_NEXT;
354 for (i = 0; sl[i]; i++)
360 static int chk_barrier(const char *bname, const struct timeval *now,
361 const struct timeval *barrier, struct timeval *diff,
366 if (tv_diff(now, barrier, diff) > 0)
370 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
374 static void vss_next_chunk_time(struct timeval *due)
378 tv_scale(mmd->chunks_sent, &mmd->afi.chunk_tv, &tmp);
379 tv_add(&tmp, &mmd->stream_start, due);
383 * != NULL: timeout for next chunk
384 * NULL: nothing to do
386 static struct timeval *vss_compute_timeout(void)
388 static struct timeval the_timeout;
389 struct timeval now, next_chunk;
391 if (vss_next() && mmd->audio_format >= 0) {
392 /* only sleep a bit, nec*/
393 the_timeout.tv_sec = 0;
394 the_timeout.tv_usec = 100;
397 gettimeofday(&now, NULL);
398 if (chk_barrier("autoplay_delay", &now, &autoplay_barrier,
399 &the_timeout, 1) < 0)
401 if (chk_barrier("eof", &now, &eof_barrier, &the_timeout, 1) < 0)
403 if (chk_barrier("data send", &now, &data_send_barrier,
404 &the_timeout, 1) < 0)
406 if (mmd->audio_format < 0 || !vss_playing() || !map)
408 vss_next_chunk_time(&next_chunk);
409 if (chk_barrier(afl[mmd->audio_format].name, &now, &next_chunk,
410 &the_timeout, 0) < 0)
412 /* chunk is due or bof */
413 the_timeout.tv_sec = 0;
414 the_timeout.tv_usec = 0;
418 static void vss_eof(void)
425 for (i = 0; senders[i].name; i++)
426 senders[i].shutdown_clients();
429 gettimeofday(&now, NULL);
430 tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
431 munmap(map, mmd->size);
434 mmd->audio_format = -1;
435 mmd->chunks_sent = 0;
437 mmd->afi.seconds_total = 0;
438 free(mmd->afi.chunk_table);
439 mmd->afi.chunk_table = NULL;
440 tmp = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_INFO1],
441 status_item_list[SI_AUDIO_INFO2], status_item_list[SI_AUDIO_INFO3]);
442 strcpy(mmd->afi.info_string, tmp);
444 tmp = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_DBINFO1],
445 status_item_list[SI_DBINFO2], status_item_list[SI_DBINFO3]);
446 strcpy(mmd->selector_info, tmp);
448 mmd->filename[0] = '\0';
454 * Get the header of the current audio file.
456 * \param header_len the length of the header is stored here
458 * \return a pointer to a buffer containing the header, or NULL, if no audio
459 * file is selected or if the current audio format does not need special header
463 char *vss_get_header(size_t *header_len)
465 if (mmd->audio_format < 0 || !map || !mmd->afi.header_len)
467 *header_len = mmd->afi.header_len;
468 return map + mmd->afi.header_offset;
472 * get the list of all supported audio formats
474 * \return a space separated list of all supported audio formats
475 * It is not allocated at runtime, i.e. there is no need to free
476 * the returned string in the caller.
478 const char *supported_audio_formats(void)
480 return SUPPORTED_AUDIO_FORMATS;
484 * get the chunk time of the current audio file
486 * \return a pointer to a struct containing the chunk time, or NULL,
487 * if currently no audio file is selected.
489 struct timeval *vss_chunk_time(void)
491 if (mmd->audio_format < 0)
493 return &mmd->afi.chunk_tv;
497 * compute the timeout for para_server's main select-loop
499 * This function gets called from para_server to determine the timeout value
500 * for its main select loop.
502 * Before the timeout is computed, the current vss status flags are evaluated
503 * and acted upon by calling appropriate functions from the lower layers.
504 * Possible actions include
506 * - request a new file list from the current audio file selector
507 * - shutdown of all senders (stop/pause command)
508 * - reposition the stream (ff/jmp command)
510 * \return A pointer to a struct timeval containing the timeout for the next
511 * chunk of data to be sent, or NULL if we're not sending right now.
513 struct timeval *vss_preselect(void)
515 struct audio_format_handler *af = NULL;
519 format = mmd->audio_format;
523 for (i = 0; senders[i].name; i++)
524 senders[i].shutdown_clients();
525 if (vss_next() && af) {
527 return vss_compute_timeout();
529 if (vss_paused() || vss_repos()) {
530 for (i = 0; senders[i].name; i++)
531 senders[i].shutdown_clients();
534 gettimeofday(&now, NULL);
535 if (!vss_paused() || mmd->chunks_sent)
536 tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
538 tv_add(&now, &announce_tv, &data_send_barrier);
539 if (mmd->new_vss_status_flags & VSS_NOMORE)
540 mmd->new_vss_status_flags = VSS_NEXT;
542 mmd->chunks_sent = 0;
545 mmd->new_vss_status_flags &= ~(VSS_REPOS);
546 mmd->current_chunk = mmd->repos_request;
548 ret = vss_compute_timeout();
549 if (!ret && !map && vss_playing() &&
550 !(mmd->new_vss_status_flags & VSS_NOMORE)) {
551 PARA_DEBUG_LOG("%s", "ready and playing, but no audio file\n");
552 vss_get_audio_file();
558 static void get_chunk(long unsigned chunk_num, char **buf, size_t *len)
560 size_t pos = mmd->afi.chunk_table[chunk_num];
562 *len = mmd->afi.chunk_table[chunk_num + 1] - pos;
566 * Get the data of the given chunk.
568 * \param chunk_num The number of the desired chunk.
569 * \param buf Chunk data.
570 * \param len Chunk length in bytes.
572 * \return Positive on success, negative on errors.
574 int vss_get_chunk(long unsigned chunk_num, char **buf, size_t *len)
576 if (mmd->audio_format < 0 || !map || !vss_playing())
578 if (chunk_num >= mmd->afi.chunks_total)
580 get_chunk(chunk_num, buf, len);
585 * main sending function
587 * This function gets called from para_server as soon as the next chunk of
588 * data should be pushed out. It first calls the read_chunk() function of
589 * the current audio format handler to obtain a pointer to the data to be
590 * sent out as well as its length. This information is then passed to each
591 * supported sender's send() function which does the actual sending.
593 void vss_send_chunk(void)
596 struct audio_format_handler *af;
597 struct timeval now, due;
599 if (mmd->audio_format < 0 || !map || !vss_playing())
601 af = &afl[mmd->audio_format];
602 gettimeofday(&now, NULL);
603 vss_next_chunk_time(&due);
604 if (tv_diff(&due, &now, NULL) > 0)
606 if (chk_barrier("eof", &now, &eof_barrier, &due, 1) < 0)
608 if (chk_barrier("data send", &now, &data_send_barrier,
611 mmd->new_vss_status_flags &= ~VSS_REPOS;
612 if (mmd->current_chunk >= mmd->afi.chunks_total) { /* eof */
613 mmd->new_vss_status_flags |= VSS_NEXT;
617 * We call the send function also in case of empty chunks as they
618 * might have still some data queued which can be sent in this case.
620 if (!mmd->chunks_sent) {
622 gettimeofday(&mmd->stream_start, NULL);
623 tv_scale(mmd->current_chunk, &mmd->afi.chunk_tv, &tmp);
624 mmd->offset = tv2ms(&tmp);
627 for (i = 0; senders[i].name; i++) {
630 get_chunk(mmd->current_chunk, &buf, &len);
631 senders[i].send(mmd->current_chunk, mmd->chunks_sent, buf, len);
633 mmd->new_vss_status_flags |= VSS_PLAYING;
635 mmd->current_chunk++;