2 * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
19 /** \file vss.c the virtual streaming system
21 * This contains the audio sending part of para_server which is independent of
22 * the current audio format, audio file selector and of the activated senders.
26 #include <sys/time.h> /* gettimeofday */
27 #include "server.cmdline.h"
35 extern const char *status_item_list[];
37 static struct timeval announce_tv;
38 static struct timeval data_send_barrier;
39 static struct timeval eof_barrier;
40 static struct timeval autoplay_barrier;
42 extern struct misc_meta_data *mmd;
43 extern struct audio_file_selector selectors[];
44 extern struct sender senders[];
46 static size_t inbuf_size;
48 static FILE *audio_file = NULL;
51 void mp3_init(struct audio_format_handler *);
55 void ogg_init(struct audio_format_handler *);
58 void aac_afh_init(struct audio_format_handler *);
62 * the list of supported audio formats
64 static struct audio_format_handler afl[] = {
88 /** iterate over each supported audio format */
89 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i++)
94 * check if vss status flag \a P (playing) is set
96 * \return greater than zero if playing, zero otherwise.
99 unsigned int vss_playing(void)
101 return mmd->new_vss_status_flags & VSS_PLAYING;
105 * check if \a N (next) status flag is set
107 * \return greater than zero if set, zero if not.
110 unsigned int vss_next(void)
112 return mmd->new_vss_status_flags & VSS_NEXT;
116 * check if a reposition request is pending
118 * \return greater than zero if true, zero otherwise.
121 unsigned int vss_repos(void)
123 return mmd->new_vss_status_flags & VSS_REPOS;
127 * check if the vss is currently paused
129 * \return greater than zero if paused, zero otherwise.
132 unsigned int vss_paused(void)
134 return !(mmd->new_vss_status_flags & VSS_NEXT)
135 && !(mmd->new_vss_status_flags & VSS_PLAYING);
139 * get the name of the given audio format
140 * \param i the audio format number
142 * This returns a pointer to statically allocated memory so it
143 * must not be freed by the caller.
145 const char *audio_format_name(int i)
147 return i >= 0? afl[i].name : "(none)";
151 * initialize the virtual streaming system
153 * Call the init functions of all supported audio format handlers and
154 * initialize all supported senders.
159 char *hn = para_hostname(), *home = para_homedir();
161 PARA_DEBUG_LOG("supported audio formats: %s\n",
162 SUPPORTED_AUDIO_FORMATS);
163 for (i = 0; afl[i].name; i++) {
164 PARA_NOTICE_LOG("initializing %s handler\n",
166 afl[i].init(&afl[i]);
168 ms2tv(conf.announce_time_arg, &announce_tv);
169 PARA_INFO_LOG("announce timeval: %lums\n", tv2ms(&announce_tv));
170 for (i = 0; senders[i].name; i++) {
171 PARA_NOTICE_LOG("initializing %s sender\n", senders[i].name);
172 senders[i].init(&senders[i]);
176 if (conf.autoplay_given) {
177 struct timeval now, tmp;
178 mmd->vss_status_flags |= VSS_PLAYING;
179 mmd->new_vss_status_flags |= VSS_PLAYING;
180 gettimeofday(&now, NULL);
181 ms2tv(conf.autoplay_delay_arg, &tmp);
182 tv_add(&now, &tmp, &autoplay_barrier);
186 static int get_file_info(int i)
188 return afl[i].get_file_info(audio_file, &mmd->afi);
192 * guess the audio format judging from filename
194 * \param name the filename
196 * \return This function returns -1 if it has no idea what kind of audio
197 * file this might be. Otherwise the (non-negative) number of the audio format
200 int guess_audio_format(const char *name)
202 int i,j, len = strlen(name);
204 FOR_EACH_AUDIO_FORMAT(i) {
205 for (j = 0; afl[i].suffixes[j]; j++) {
206 const char *p = afl[i].suffixes[j];
207 int plen = strlen(p);
210 if (name[len - plen - 1] != '.')
212 if (strcasecmp(name + len - plen, p))
214 // PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
221 static int get_audio_format(int omit)
225 FOR_EACH_AUDIO_FORMAT(i) {
229 if (get_file_info(i) > 0)
233 return -E_AUDIO_FORMAT;
239 static int update_mmd(void)
242 struct stat file_status;
244 i = guess_audio_format(mmd->filename);
245 if (i < 0 || get_file_info(i) < 0)
246 i = get_audio_format(i);
249 mmd->audio_format = i;
250 mmd->chunks_sent = 0;
251 mmd->current_chunk = 0;
253 if (fstat(fileno(audio_file), &file_status) == -1)
255 mmd->size = file_status.st_size;
256 mmd->mtime = file_status.st_mtime;
258 PARA_NOTICE_LOG("next audio file: %s\n", mmd->filename);
262 static void get_song(void)
264 char **sl = selectors[mmd->selector_num].get_audio_file_list(10);
269 for (i = 0; sl[i]; i++) {
271 PARA_INFO_LOG("trying %s\n", sl[i]);
272 if (strlen(sl[i]) >= _POSIX_PATH_MAX)
274 audio_file = fopen(sl[i], "r");
277 strcpy(mmd->filename, sl[i]);
278 if (update_mmd() < 0) {
284 if (selectors[mmd->selector_num].update_audio_file)
285 selectors[mmd->selector_num].update_audio_file(sl[i]);
286 PARA_DEBUG_LOG("%s", "success\n");
287 mmd->new_vss_status_flags &= (~VSS_NEXT);
288 gettimeofday(&now, NULL);
289 tv_add(&now, &announce_tv, &data_send_barrier);
293 PARA_ERROR_LOG("%s", "no valid files found\n");
295 mmd->new_vss_status_flags = VSS_NEXT;
298 for (i = 0; sl[i]; i++)
304 static int chk_barrier(const char *bname, const struct timeval *now,
305 const struct timeval *barrier, struct timeval *diff,
310 if (tv_diff(now, barrier, diff) > 0)
314 PARA_DEBUG_LOG("%s barrier: %lims left\n", bname, ms);
318 static void vss_next_chunk_time(struct timeval *due)
322 tv_scale(mmd->chunks_sent, &mmd->afi.chunk_tv, &tmp);
323 tv_add(&tmp, &mmd->stream_start, due);
327 * != NULL: timeout for next chunk
328 * NULL: nothing to do
330 static struct timeval *vss_compute_timeout(void)
332 static struct timeval the_timeout;
333 struct timeval now, next_chunk;
335 if (vss_next() && mmd->audio_format >= 0) {
336 /* only sleep a bit, nec*/
337 the_timeout.tv_sec = 0;
338 the_timeout.tv_usec = 100;
341 gettimeofday(&now, NULL);
342 if (chk_barrier("autoplay_delay", &now, &autoplay_barrier,
343 &the_timeout, 1) < 0)
345 if (chk_barrier("eof", &now, &eof_barrier, &the_timeout, 1) < 0)
347 if (chk_barrier("data send", &now, &data_send_barrier,
348 &the_timeout, 1) < 0)
350 if (mmd->audio_format < 0 || !vss_playing() || !audio_file)
352 vss_next_chunk_time(&next_chunk);
353 if (chk_barrier(afl[mmd->audio_format].name, &now, &next_chunk,
354 &the_timeout, 0) < 0)
356 /* chunk is due or bof */
357 the_timeout.tv_sec = 0;
358 the_timeout.tv_usec = 0;
362 static void vss_eof(struct audio_format_handler *af)
368 if (!af || !audio_file) {
369 for (i = 0; senders[i].name; i++)
370 senders[i].shutdown_clients();
373 gettimeofday(&now, NULL);
374 tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
377 mmd->audio_format = -1;
379 mmd->chunks_sent = 0;
381 mmd->afi.seconds_total = 0;
382 free(mmd->afi.chunk_table);
383 mmd->afi.chunk_table = NULL;
384 PARA_ERROR_LOG("freeing header %p\n", mmd->afi.header);
385 free(mmd->afi.header);
386 mmd->afi.header = NULL;
387 tmp = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_AUDIO_INFO1],
388 status_item_list[SI_AUDIO_INFO2], status_item_list[SI_AUDIO_INFO3]);
389 strcpy(mmd->afi.info_string, tmp);
391 tmp = make_message("%s:\n%s:\n%s:\n", status_item_list[SI_DBINFO1],
392 status_item_list[SI_DBINFO2], status_item_list[SI_DBINFO3]);
393 strcpy(mmd->selector_info, tmp);
395 mmd->filename[0] = '\0';
401 * get the header and of the current audio file
403 * \param header_len the length of the header is stored here
405 * \return a pointer to a buffer containing the header, or NULL, if no audio
406 * file is selected or if the current audio format does not need special header
410 char *vss_get_header(int *header_len)
412 if (mmd->audio_format < 0)
414 *header_len = mmd->afi.header_len;
415 return mmd->afi.header;
419 * get the list of all supported audio formats
421 * \return a space separated list of all supported audio formats
422 * It is not allocated at runtime, i.e. there is no need to free
423 * the returned string in the caller.
425 const char *supported_audio_formats(void)
427 return SUPPORTED_AUDIO_FORMATS;
431 * get the chunk time of the current audio file
433 * \return a pointer to a struct containing the chunk time, or NULL,
434 * if currently no audio file is selected.
436 struct timeval *vss_chunk_time(void)
438 if (mmd->audio_format < 0)
440 return &mmd->afi.chunk_tv;
444 * compute the timeout for para_server's main select-loop
446 * This function gets called from para_server to determine the timeout value
447 * for its main select loop.
449 * Before the timeout is computed, the current vss status flags are evaluated
450 * and acted upon by calling appropriate functions from the lower layers.
451 * Possible actions include
453 * - request a new file list from the current audio file selector
454 * - shutdown of all senders (stop/pause command)
455 * - reposition the stream (ff/jmp command)
457 * \return A pointer to a struct timeval containing the timeout for the next
458 * chunk of data to be sent, or NULL if we're not sending right now.
460 struct timeval *vss_preselect(void)
462 struct audio_format_handler *af = NULL;
466 format = mmd->audio_format;
470 for (i = 0; senders[i].name; i++)
471 senders[i].shutdown_clients();
472 if (vss_next() && af) {
474 return vss_compute_timeout();
476 if (vss_paused() || vss_repos()) {
477 for (i = 0; senders[i].name; i++)
478 senders[i].shutdown_clients();
481 gettimeofday(&now, NULL);
482 if (!vss_paused() || mmd->chunks_sent)
483 tv_add(&mmd->afi.eof_tv, &now, &eof_barrier);
485 tv_add(&now, &announce_tv, &data_send_barrier);
486 if (mmd->new_vss_status_flags & VSS_NOMORE)
487 mmd->new_vss_status_flags = VSS_NEXT;
489 mmd->chunks_sent = 0;
492 mmd->new_vss_status_flags &= ~(VSS_REPOS);
493 mmd->current_chunk = mmd->repos_request;
495 ret = vss_compute_timeout();
496 if (!ret && !audio_file && vss_playing() &&
497 !(mmd->new_vss_status_flags & VSS_NOMORE)) {
498 PARA_DEBUG_LOG("%s", "ready and playing, but no audio file\n");
506 * read a chunk of data from the current audio file
508 * \return The length of the chunk on success, zero on end of file, negative on
509 * errors. Note: If the current chunk is of length zero, but the end of the
510 * file is not yet reached, this function returns -E_EMPTY_CHUNK.
512 ssize_t vss_read_chunk(void)
517 long unsigned cc = mmd->current_chunk;
519 if (cc >= mmd->afi.chunks_total) /* eof */
521 len = mmd->afi.chunk_table[cc + 1] - mmd->afi.chunk_table[cc];
522 if (!len) /* nothing to send for this run */
523 return -E_EMPTY_CHUNK;
524 pos = mmd->afi.chunk_table[cc];
525 if (inbuf_size < len) {
526 PARA_INFO_LOG("increasing inbuf for chunk #%lu/%lu to %zu bytes\n",
527 cc, mmd->afi.chunks_total, len);
528 inbuf = para_realloc(inbuf, len);
531 ret = para_fseek(audio_file, pos, SEEK_SET);
534 return para_fread(inbuf, len, 1, audio_file);
538 * main sending function
540 * This function gets called from para_server as soon as the next chunk of
541 * data should be pushed out. It first calls the read_chunk() function of
542 * the current audio format handler to obtain a pointer to the data to be
543 * sent out as well as its length. This information is then passed to each
544 * supported sender's send() function which does the actual sending.
546 void vss_send_chunk(void)
549 struct audio_format_handler *af;
551 struct timeval now, due;
553 if (mmd->audio_format < 0 || !audio_file || !vss_playing())
555 af = &afl[mmd->audio_format];
556 gettimeofday(&now, NULL);
557 vss_next_chunk_time(&due);
558 if (tv_diff(&due, &now, NULL) > 0)
560 if (chk_barrier("eof", &now, &eof_barrier, &due, 1) < 0)
562 if (chk_barrier("data send", &now, &data_send_barrier,
565 ret= vss_read_chunk();
566 mmd->new_vss_status_flags &= ~VSS_REPOS;
567 if (!ret || (ret < 0 && ret != -E_EMPTY_CHUNK)) {
569 mmd->new_vss_status_flags = VSS_NEXT;
570 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
572 mmd->new_vss_status_flags |= VSS_NEXT;
577 * We call the send function also in case of empty chunks as they
578 * might have still some data queued which can be sent in this case.
582 if (!mmd->chunks_sent) {
584 gettimeofday(&mmd->stream_start, NULL);
585 tv_scale(mmd->current_chunk, &mmd->afi.chunk_tv, &tmp);
586 mmd->offset = tv2ms(&tmp);
589 for (i = 0; senders[i].name; i++)
590 senders[i].send(mmd->current_chunk, mmd->chunks_sent, inbuf, ret);
591 mmd->new_vss_status_flags |= VSS_PLAYING;
593 mmd->current_chunk++;