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missing break in soxargs()
[disorder] / server / speaker.c
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460b9539 1/*
2 * This file is part of DisOrder
dea8f8aa 3 * Copyright (C) 2005, 2006, 2007 Richard Kettlewell
460b9539 4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
18 * USA
19 */
20
21/* This program deliberately does not use the garbage collector even though it
22 * might be convenient to do so. This is for two reasons. Firstly some libao
23 * drivers are implemented using threads and we do not want to have to deal
24 * with potential interactions between threading and garbage collection.
25 * Secondly this process needs to be able to respond quickly and this is not
26 * compatible with the collector hanging the program even relatively
27 * briefly. */
28
29#include <config.h>
30#include "types.h"
31
32#include <getopt.h>
33#include <stdio.h>
34#include <stdlib.h>
35#include <locale.h>
36#include <syslog.h>
37#include <unistd.h>
38#include <errno.h>
39#include <ao/ao.h>
40#include <string.h>
41#include <assert.h>
42#include <sys/select.h>
9d5da576 43#include <sys/wait.h>
460b9539 44#include <time.h>
8023f60b 45#include <fcntl.h>
46#include <poll.h>
460b9539 47
48#include "configuration.h"
49#include "syscalls.h"
50#include "log.h"
51#include "defs.h"
52#include "mem.h"
53#include "speaker.h"
54#include "user.h"
55
8023f60b 56#if API_ALSA
dea8f8aa 57#include <alsa/asoundlib.h>
8023f60b 58#endif
dea8f8aa 59
460b9539 60#define BUFFER_SECONDS 5 /* How many seconds of input to
61 * buffer. */
62
63#define FRAMES 4096 /* Frame batch size */
64
65#define NFDS 256 /* Max FDs to poll for */
66
67/* Known tracks are kept in a linked list. We don't normally to have
68 * more than two - maybe three at the outside. */
69static struct track {
70 struct track *next; /* next track */
71 int fd; /* input FD */
72 char id[24]; /* ID */
73 size_t start, used; /* start + bytes used */
74 int eof; /* input is at EOF */
75 int got_format; /* got format yet? */
76 ao_sample_format format; /* sample format */
77 unsigned long long played; /* number of frames played */
78 char *buffer; /* sample buffer */
79 size_t size; /* sample buffer size */
80 int slot; /* poll array slot */
81} *tracks, *playing; /* all tracks + playing track */
82
83static time_t last_report; /* when we last reported */
84static int paused; /* pause status */
460b9539 85static ao_sample_format pcm_format; /* current format if aodev != 0 */
86static size_t bpf; /* bytes per frame */
87static struct pollfd fds[NFDS]; /* if we need more than that */
88static int fdno; /* fd number */
8023f60b 89static size_t bufsize; /* buffer size */
90#if API_ALSA
91static snd_pcm_t *pcm; /* current pcm handle */
0c207c37 92static snd_pcm_uframes_t last_pcm_bufsize; /* last seen buffer size */
8023f60b 93#endif
9d5da576 94static int ready; /* ready to send audio */
460b9539 95static int forceplay; /* frames to force play */
9d5da576 96static int kidfd = -1; /* child process input */
460b9539 97
98static const struct option options[] = {
99 { "help", no_argument, 0, 'h' },
100 { "version", no_argument, 0, 'V' },
101 { "config", required_argument, 0, 'c' },
102 { "debug", no_argument, 0, 'd' },
103 { "no-debug", no_argument, 0, 'D' },
104 { 0, 0, 0, 0 }
105};
106
107/* Display usage message and terminate. */
108static void help(void) {
109 xprintf("Usage:\n"
110 " disorder-speaker [OPTIONS]\n"
111 "Options:\n"
112 " --help, -h Display usage message\n"
113 " --version, -V Display version number\n"
114 " --config PATH, -c PATH Set configuration file\n"
115 " --debug, -d Turn on debugging\n"
116 "\n"
117 "Speaker process for DisOrder. Not intended to be run\n"
118 "directly.\n");
119 xfclose(stdout);
120 exit(0);
121}
122
123/* Display version number and terminate. */
124static void version(void) {
125 xprintf("disorder-speaker version %s\n", disorder_version_string);
126 xfclose(stdout);
127 exit(0);
128}
129
130/* Return the number of bytes per frame in FORMAT. */
131static size_t bytes_per_frame(const ao_sample_format *format) {
132 return format->channels * format->bits / 8;
133}
134
135/* Find track ID, maybe creating it if not found. */
136static struct track *findtrack(const char *id, int create) {
137 struct track *t;
138
139 D(("findtrack %s %d", id, create));
140 for(t = tracks; t && strcmp(id, t->id); t = t->next)
141 ;
142 if(!t && create) {
143 t = xmalloc(sizeof *t);
144 t->next = tracks;
145 strcpy(t->id, id);
146 t->fd = -1;
147 tracks = t;
148 /* The initial input buffer will be the sample format. */
149 t->buffer = (void *)&t->format;
150 t->size = sizeof t->format;
151 }
152 return t;
153}
154
155/* Remove track ID (but do not destroy it). */
156static struct track *removetrack(const char *id) {
157 struct track *t, **tt;
158
159 D(("removetrack %s", id));
160 for(tt = &tracks; (t = *tt) && strcmp(id, t->id); tt = &t->next)
161 ;
162 if(t)
163 *tt = t->next;
164 return t;
165}
166
167/* Destroy a track. */
168static void destroy(struct track *t) {
169 D(("destroy %s", t->id));
170 if(t->fd != -1) xclose(t->fd);
171 if(t->buffer != (void *)&t->format) free(t->buffer);
172 free(t);
173}
174
175/* Notice a new FD. */
176static void acquire(struct track *t, int fd) {
177 D(("acquire %s %d", t->id, fd));
178 if(t->fd != -1)
179 xclose(t->fd);
180 t->fd = fd;
181 nonblock(fd);
182}
183
184/* Read data into a sample buffer. Return 0 on success, -1 on EOF. */
185static int fill(struct track *t) {
186 size_t where, left;
187 int n;
188
189 D(("fill %s: eof=%d used=%zu size=%zu got_format=%d",
190 t->id, t->eof, t->used, t->size, t->got_format));
191 if(t->eof) return -1;
192 if(t->used < t->size) {
193 /* there is room left in the buffer */
194 where = (t->start + t->used) % t->size;
195 if(t->got_format) {
196 /* We are reading audio data, get as much as we can */
197 if(where >= t->start) left = t->size - where;
198 else left = t->start - where;
199 } else
200 /* We are still waiting for the format, only get that */
201 left = sizeof (ao_sample_format) - t->used;
202 do {
203 n = read(t->fd, t->buffer + where, left);
204 } while(n < 0 && errno == EINTR);
205 if(n < 0) {
206 if(errno != EAGAIN) fatal(errno, "error reading sample stream");
207 return 0;
208 }
209 if(n == 0) {
210 D(("fill %s: eof detected", t->id));
211 t->eof = 1;
212 return -1;
213 }
214 t->used += n;
215 if(!t->got_format && t->used >= sizeof (ao_sample_format)) {
216 assert(t->used == sizeof (ao_sample_format));
217 /* Check that our assumptions are met. */
218 if(t->format.bits & 7)
219 fatal(0, "bits per sample not a multiple of 8");
220 /* Make a new buffer for audio data. */
221 t->size = bytes_per_frame(&t->format) * t->format.rate * BUFFER_SECONDS;
222 t->buffer = xmalloc(t->size);
223 t->used = 0;
224 t->got_format = 1;
225 D(("got format for %s", t->id));
226 }
227 }
228 return 0;
229}
230
231/* Return true if A and B denote identical libao formats, else false. */
232static int formats_equal(const ao_sample_format *a,
233 const ao_sample_format *b) {
234 return (a->bits == b->bits
235 && a->rate == b->rate
236 && a->channels == b->channels
237 && a->byte_format == b->byte_format);
238}
239
240/* Close the sound device. */
241static void idle(void) {
460b9539 242 D(("idle"));
8023f60b 243#if API_ALSA
460b9539 244 if(pcm) {
8023f60b 245 int err;
246
460b9539 247 if((err = snd_pcm_nonblock(pcm, 0)) < 0)
248 fatal(0, "error calling snd_pcm_nonblock: %d", err);
249 D(("draining pcm"));
250 snd_pcm_drain(pcm);
251 D(("closing pcm"));
252 snd_pcm_close(pcm);
253 pcm = 0;
254 forceplay = 0;
255 D(("released audio device"));
256 }
8023f60b 257#endif
9d5da576 258 ready = 0;
460b9539 259}
260
261/* Abandon the current track */
262static void abandon(void) {
263 struct speaker_message sm;
264
265 D(("abandon"));
266 memset(&sm, 0, sizeof sm);
267 sm.type = SM_FINISHED;
268 strcpy(sm.id, playing->id);
269 speaker_send(1, &sm, 0);
270 removetrack(playing->id);
271 destroy(playing);
272 playing = 0;
273 forceplay = 0;
274}
275
8023f60b 276#if API_ALSA
1c6e6a61 277static void log_params(snd_pcm_hw_params_t *hwparams,
278 snd_pcm_sw_params_t *swparams) {
279 snd_pcm_uframes_t f;
280 unsigned u;
281
0c207c37 282 return; /* too verbose */
1c6e6a61 283 if(hwparams) {
284 /* TODO */
285 }
286 if(swparams) {
287 snd_pcm_sw_params_get_silence_size(swparams, &f);
288 info("sw silence_size=%lu", (unsigned long)f);
289 snd_pcm_sw_params_get_silence_threshold(swparams, &f);
290 info("sw silence_threshold=%lu", (unsigned long)f);
291 snd_pcm_sw_params_get_sleep_min(swparams, &u);
292 info("sw sleep_min=%lu", (unsigned long)u);
293 snd_pcm_sw_params_get_start_threshold(swparams, &f);
294 info("sw start_threshold=%lu", (unsigned long)f);
295 snd_pcm_sw_params_get_stop_threshold(swparams, &f);
296 info("sw stop_threshold=%lu", (unsigned long)f);
297 snd_pcm_sw_params_get_xfer_align(swparams, &f);
298 info("sw xfer_align=%lu", (unsigned long)f);
299 }
300}
8023f60b 301#endif
1c6e6a61 302
9d5da576 303static void soxargs(const char ***pp, char **qq, ao_sample_format *ao)
304{
305 int n;
306
307 *(*pp)++ = "-t.raw";
308 *(*pp)++ = "-s";
309 *(*pp)++ = *qq; n = sprintf(*qq, "-r%d", ao->rate); *qq += n + 1;
310 switch(ao->byte_format) {
311 case AO_FMT_NATIVE: break;
27801653 312 case AO_FMT_BIG: *(*pp)++ = "-B"; break;
313 case AO_FMT_LITTLE: *(*pp)++ = "-L"; break;
9d5da576 314 }
315 *(*pp)++ = *qq; n = sprintf(*qq, "-%d", ao->bits/8); *qq += n + 1;
316 *(*pp)++ = *qq; n = sprintf(*qq, "-c%d", ao->channels); *qq += n + 1;
317}
318
460b9539 319/* Make sure the sound device is open and has the right sample format. Return
320 * 0 on success and -1 on error. */
321static int activate(void) {
460b9539 322 /* If we don't know the format yet we cannot start. */
323 if(!playing->got_format) {
324 D((" - not got format for %s", playing->id));
325 return -1;
326 }
9d5da576 327 if(kidfd >= 0) {
328 if(!formats_equal(&playing->format, &config->sample_format)) {
329 char argbuf[1024], *q = argbuf;
330 const char *av[18], **pp = av;
331 int soxpipe[2];
332 pid_t soxkid;
333 *pp++ = "sox";
334 soxargs(&pp, &q, &playing->format);
335 *pp++ = "-";
336 soxargs(&pp, &q, &config->sample_format);
337 *pp++ = "-";
338 *pp++ = 0;
339 if(debugging) {
340 for(pp = av; *pp; pp++)
341 D(("sox arg[%d] = %s", pp - av, *pp));
342 D(("end args"));
343 }
344 xpipe(soxpipe);
345 soxkid = xfork();
346 if(soxkid == 0) {
347 xdup2(playing->fd, 0);
348 xdup2(soxpipe[1], 1);
349 fcntl(0, F_SETFL, fcntl(0, F_GETFL) & ~O_NONBLOCK);
350 close(soxpipe[0]);
351 close(soxpipe[1]);
352 close(playing->fd);
353 execvp("sox", (char **)av);
354 _exit(1);
355 }
356 D(("forking sox for format conversion (kid = %d)", soxkid));
357 close(playing->fd);
358 close(soxpipe[1]);
359 playing->fd = soxpipe[0];
360 playing->format = config->sample_format;
361 ready = 0;
362 }
363 if(!ready) {
364 pcm_format = config->sample_format;
8023f60b 365 bufsize = 3 * FRAMES;
9d5da576 366 bpf = bytes_per_frame(&config->sample_format);
367 D(("acquired audio device"));
368 ready = 1;
369 }
370 return 0;
371 }
8023f60b 372#if API_ALSA
460b9539 373 /* If we need to change format then close the current device. */
374 if(pcm && !formats_equal(&playing->format, &pcm_format))
375 idle();
376 if(!pcm) {
8023f60b 377 snd_pcm_hw_params_t *hwparams;
378 snd_pcm_sw_params_t *swparams;
379 snd_pcm_uframes_t pcm_bufsize;
380 int err;
381 int sample_format = 0;
382 unsigned rate;
383
460b9539 384 D(("snd_pcm_open"));
385 if((err = snd_pcm_open(&pcm,
386 config->device,
387 SND_PCM_STREAM_PLAYBACK,
388 SND_PCM_NONBLOCK))) {
389 error(0, "error from snd_pcm_open: %d", err);
390 goto error;
391 }
392 snd_pcm_hw_params_alloca(&hwparams);
393 D(("set up hw params"));
394 if((err = snd_pcm_hw_params_any(pcm, hwparams)) < 0)
395 fatal(0, "error from snd_pcm_hw_params_any: %d", err);
396 if((err = snd_pcm_hw_params_set_access(pcm, hwparams,
397 SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
398 fatal(0, "error from snd_pcm_hw_params_set_access: %d", err);
399 switch(playing->format.bits) {
400 case 8:
401 sample_format = SND_PCM_FORMAT_S8;
402 break;
403 case 16:
404 switch(playing->format.byte_format) {
405 case AO_FMT_NATIVE: sample_format = SND_PCM_FORMAT_S16; break;
406 case AO_FMT_LITTLE: sample_format = SND_PCM_FORMAT_S16_LE; break;
407 case AO_FMT_BIG: sample_format = SND_PCM_FORMAT_S16_BE; break;
408 error(0, "unrecognized byte format %d", playing->format.byte_format);
409 goto fatal;
410 }
411 break;
412 default:
413 error(0, "unsupported sample size %d", playing->format.bits);
414 goto fatal;
415 }
416 if((err = snd_pcm_hw_params_set_format(pcm, hwparams,
417 sample_format)) < 0) {
418 error(0, "error from snd_pcm_hw_params_set_format (%d): %d",
419 sample_format, err);
420 goto fatal;
421 }
422 rate = playing->format.rate;
423 if((err = snd_pcm_hw_params_set_rate_near(pcm, hwparams, &rate, 0)) < 0) {
424 error(0, "error from snd_pcm_hw_params_set_rate (%d): %d",
425 playing->format.rate, err);
426 goto fatal;
427 }
428 if(rate != (unsigned)playing->format.rate)
429 info("want rate %d, got %u", playing->format.rate, rate);
430 if((err = snd_pcm_hw_params_set_channels(pcm, hwparams,
431 playing->format.channels)) < 0) {
432 error(0, "error from snd_pcm_hw_params_set_channels (%d): %d",
433 playing->format.channels, err);
434 goto fatal;
435 }
8023f60b 436 bufsize = 3 * FRAMES;
437 pcm_bufsize = bufsize;
460b9539 438 if((err = snd_pcm_hw_params_set_buffer_size_near(pcm, hwparams,
439 &pcm_bufsize)) < 0)
440 fatal(0, "error from snd_pcm_hw_params_set_buffer_size (%d): %d",
441 3 * FRAMES, err);
0c207c37 442 if(pcm_bufsize != 3 * FRAMES && pcm_bufsize != last_pcm_bufsize)
460b9539 443 info("asked for PCM buffer of %d frames, got %d",
444 3 * FRAMES, (int)pcm_bufsize);
0c207c37 445 last_pcm_bufsize = pcm_bufsize;
460b9539 446 if((err = snd_pcm_hw_params(pcm, hwparams)) < 0)
447 fatal(0, "error calling snd_pcm_hw_params: %d", err);
448 D(("set up sw params"));
449 snd_pcm_sw_params_alloca(&swparams);
450 if((err = snd_pcm_sw_params_current(pcm, swparams)) < 0)
451 fatal(0, "error calling snd_pcm_sw_params_current: %d", err);
452 if((err = snd_pcm_sw_params_set_avail_min(pcm, swparams, FRAMES)) < 0)
453 fatal(0, "error calling snd_pcm_sw_params_set_avail_min %d: %d",
454 FRAMES, err);
455 if((err = snd_pcm_sw_params(pcm, swparams)) < 0)
456 fatal(0, "error calling snd_pcm_sw_params: %d", err);
457 pcm_format = playing->format;
458 bpf = bytes_per_frame(&pcm_format);
459 D(("acquired audio device"));
1c6e6a61 460 log_params(hwparams, swparams);
9d5da576 461 ready = 1;
460b9539 462 }
463 return 0;
464fatal:
465 abandon();
466error:
467 /* We assume the error is temporary and that we'll retry in a bit. */
468 if(pcm) {
469 snd_pcm_close(pcm);
470 pcm = 0;
471 }
8023f60b 472#endif
460b9539 473 return -1;
474}
475
476/* Check to see whether the current track has finished playing */
477static void maybe_finished(void) {
478 if(playing
479 && playing->eof
480 && (!playing->got_format
481 || playing->used < bytes_per_frame(&playing->format)))
482 abandon();
483}
484
9d5da576 485static void fork_kid(void) {
486 pid_t kid;
487 int pfd[2];
488 if(kidfd != -1) close(kidfd);
489 xpipe(pfd);
490 kid = xfork();
491 if(!kid) {
492 xdup2(pfd[0], 0);
493 close(pfd[0]);
494 close(pfd[1]);
495 execl("/bin/sh", "sh", "-c", config->speaker_command, (char *)0);
496 fatal(errno, "error execing /bin/sh");
497 }
498 close(pfd[0]);
499 kidfd = pfd[1];
500 D(("forked kid %d, fd = %d", kid, kidfd));
501}
502
460b9539 503static void play(size_t frames) {
8023f60b 504 size_t avail_bytes, written_frames;
9d5da576 505 ssize_t written_bytes;
460b9539 506
507 if(activate()) {
508 if(playing)
509 forceplay = frames;
510 else
511 forceplay = 0; /* Must have called abandon() */
512 return;
513 }
514 D(("play: play %zu/%zu%s %dHz %db %dc", frames, playing->used / bpf,
515 playing->eof ? " EOF" : "",
516 playing->format.rate,
517 playing->format.bits,
518 playing->format.channels));
519 /* If we haven't got enough bytes yet wait until we have. Exception: when
520 * we are at eof. */
521 if(playing->used < frames * bpf && !playing->eof) {
522 forceplay = frames;
523 return;
524 }
525 /* We have got enough data so don't force play again */
526 forceplay = 0;
527 /* Figure out how many frames there are available to write */
528 if(playing->start + playing->used > playing->size)
529 avail_bytes = playing->size - playing->start;
530 else
531 avail_bytes = playing->used;
9d5da576 532
533 if(kidfd == -1) {
8023f60b 534#if API_ALSA
535 snd_pcm_sframes_t pcm_written_frames;
536 size_t avail_frames;
537 int err;
538
9d5da576 539 avail_frames = avail_bytes / bpf;
540 if(avail_frames > frames)
541 avail_frames = frames;
542 if(!avail_frames)
460b9539 543 return;
8023f60b 544 pcm_written_frames = snd_pcm_writei(pcm,
545 playing->buffer + playing->start,
546 avail_frames);
9d5da576 547 D(("actually play %zu frames, wrote %d",
8023f60b 548 avail_frames, (int)pcm_written_frames));
549 if(pcm_written_frames < 0) {
550 switch(pcm_written_frames) {
9d5da576 551 case -EPIPE: /* underrun */
552 error(0, "snd_pcm_writei reports underrun");
553 if((err = snd_pcm_prepare(pcm)) < 0)
554 fatal(0, "error calling snd_pcm_prepare: %d", err);
555 return;
556 case -EAGAIN:
557 return;
558 default:
8023f60b 559 fatal(0, "error calling snd_pcm_writei: %d",
560 (int)pcm_written_frames);
9d5da576 561 }
562 }
8023f60b 563 written_frames = pcm_written_frames;
9d5da576 564 written_bytes = written_frames * bpf;
8023f60b 565#else
566 assert(!"reached");
567#endif
9d5da576 568 } else {
569 if(avail_bytes > frames * bpf)
570 avail_bytes = frames * bpf;
571 written_bytes = write(kidfd, playing->buffer + playing->start,
572 avail_bytes);
573 D(("actually play %zu bytes, wrote %d",
574 avail_bytes, (int)written_bytes));
575 if(written_bytes < 0) {
576 switch(errno) {
577 case EPIPE:
578 error(0, "hmm, kid died; trying another");
579 fork_kid();
580 return;
581 case EAGAIN:
582 return;
583 }
460b9539 584 }
9d5da576 585 written_frames = written_bytes / bpf; /* good enough */
460b9539 586 }
460b9539 587 playing->start += written_bytes;
588 playing->used -= written_bytes;
589 playing->played += written_frames;
590 /* If the pointer is at the end of the buffer (or the buffer is completely
591 * empty) wrap it back to the start. */
592 if(!playing->used || playing->start == playing->size)
593 playing->start = 0;
594 frames -= written_frames;
595}
596
597/* Notify the server what we're up to. */
598static void report(void) {
599 struct speaker_message sm;
600
601 if(playing && playing->buffer != (void *)&playing->format) {
602 memset(&sm, 0, sizeof sm);
603 sm.type = paused ? SM_PAUSED : SM_PLAYING;
604 strcpy(sm.id, playing->id);
605 sm.data = playing->played / playing->format.rate;
606 speaker_send(1, &sm, 0);
607 }
608 time(&last_report);
609}
610
9d5da576 611static void reap(int __attribute__((unused)) sig) {
612 pid_t kid;
613 int st;
614
615 do
616 kid = waitpid(-1, &st, WNOHANG);
617 while(kid > 0);
618 signal(SIGCHLD, reap);
619}
620
460b9539 621static int addfd(int fd, int events) {
622 if(fdno < NFDS) {
623 fds[fdno].fd = fd;
624 fds[fdno].events = events;
625 return fdno++;
626 } else
627 return -1;
628}
629
630int main(int argc, char **argv) {
8023f60b 631 int n, fd, stdin_slot, alsa_slots, kid_slot;
460b9539 632 struct track *t;
633 struct speaker_message sm;
8023f60b 634#if API_ALSA
635 int alsa_nslots = -1, err;
636#endif
460b9539 637
638 set_progname(argv);
639 mem_init(0);
640 if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale");
641 while((n = getopt_long(argc, argv, "hVc:dD", options, 0)) >= 0) {
642 switch(n) {
643 case 'h': help();
644 case 'V': version();
645 case 'c': configfile = optarg; break;
646 case 'd': debugging = 1; break;
647 case 'D': debugging = 0; break;
648 default: fatal(0, "invalid option");
649 }
650 }
651 if(getenv("DISORDER_DEBUG_SPEAKER")) debugging = 1;
652 /* If stderr is a TTY then log there, otherwise to syslog. */
653 if(!isatty(2)) {
654 openlog(progname, LOG_PID, LOG_DAEMON);
655 log_default = &log_syslog;
656 }
657 if(config_read()) fatal(0, "cannot read configuration");
658 /* ignore SIGPIPE */
659 signal(SIGPIPE, SIG_IGN);
9d5da576 660 /* reap kids */
661 signal(SIGCHLD, reap);
460b9539 662 /* set nice value */
663 xnice(config->nice_speaker);
664 /* change user */
665 become_mortal();
666 /* make sure we're not root, whatever the config says */
667 if(getuid() == 0 || geteuid() == 0) fatal(0, "do not run as root");
668 info("started");
8023f60b 669 if(config->speaker_command)
670 fork_kid();
671 else {
672#if API_ALSA
673 /* ok */
674#else
675 fatal(0, "invoked speaker but no speaker_command and no known sound API");
676 #endif
677 }
460b9539 678 while(getppid() != 1) {
679 fdno = 0;
680 /* Always ready for commands from the main server. */
681 stdin_slot = addfd(0, POLLIN);
682 /* Try to read sample data for the currently playing track if there is
683 * buffer space. */
684 if(playing && !playing->eof && playing->used < playing->size) {
685 playing->slot = addfd(playing->fd, POLLIN);
686 } else if(playing)
687 playing->slot = -1;
688 /* If forceplay is set then wait until it succeeds before waiting on the
689 * sound device. */
9d5da576 690 alsa_slots = -1;
691 kid_slot = -1;
8023f60b 692 if(ready && !forceplay) {
9d5da576 693 if(kidfd >= 0)
694 kid_slot = addfd(kidfd, POLLOUT);
695 else {
8023f60b 696#if API_ALSA
9d5da576 697 int retry = 3;
698
699 alsa_slots = fdno;
700 do {
701 retry = 0;
702 alsa_nslots = snd_pcm_poll_descriptors(pcm, &fds[fdno], NFDS - fdno);
703 if((alsa_nslots <= 0
704 || !(fds[alsa_slots].events & POLLOUT))
705 && snd_pcm_state(pcm) == SND_PCM_STATE_XRUN) {
706 error(0, "underrun detected after call to snd_pcm_poll_descriptors()");
707 if((err = snd_pcm_prepare(pcm)))
708 fatal(0, "error calling snd_pcm_prepare: %d", err);
709 } else
710 break;
711 } while(retry-- > 0);
712 if(alsa_nslots >= 0)
713 fdno += alsa_nslots;
8023f60b 714#endif
9d5da576 715 }
716 }
460b9539 717 /* If any other tracks don't have a full buffer, try to read sample data
718 * from them. */
719 for(t = tracks; t; t = t->next)
720 if(t != playing) {
721 if(!t->eof && t->used < t->size) {
9d5da576 722 t->slot = addfd(t->fd, POLLIN | POLLHUP);
460b9539 723 } else
724 t->slot = -1;
725 }
726 /* Wait up to a second before thinking about current state */
727 n = poll(fds, fdno, 1000);
728 if(n < 0) {
729 if(errno == EINTR) continue;
730 fatal(errno, "error calling poll");
731 }
732 /* Play some sound before doing anything else */
733 if(alsa_slots != -1) {
8023f60b 734#if API_ALSA
735 unsigned short alsa_revents;
736
460b9539 737 if((err = snd_pcm_poll_descriptors_revents(pcm,
738 &fds[alsa_slots],
739 alsa_nslots,
740 &alsa_revents)) < 0)
741 fatal(0, "error calling snd_pcm_poll_descriptors_revents: %d", err);
9d5da576 742 if(alsa_revents & (POLLOUT | POLLERR))
743 play(3 * FRAMES);
8023f60b 744#endif
9d5da576 745 } else if(kid_slot != -1) {
746 if(fds[kid_slot].revents & (POLLOUT | POLLERR))
460b9539 747 play(3 * FRAMES);
748 } else {
749 /* Some attempt to play must have failed */
750 if(playing && !paused)
751 play(forceplay);
752 else
753 forceplay = 0; /* just in case */
754 }
755 /* Perhaps we have a command to process */
756 if(fds[stdin_slot].revents & POLLIN) {
757 n = speaker_recv(0, &sm, &fd);
758 if(n > 0)
759 switch(sm.type) {
760 case SM_PREPARE:
761 D(("SM_PREPARE %s %d", sm.id, fd));
762 if(fd == -1) fatal(0, "got SM_PREPARE but no file descriptor");
763 t = findtrack(sm.id, 1);
764 acquire(t, fd);
765 break;
766 case SM_PLAY:
767 D(("SM_PLAY %s %d", sm.id, fd));
768 if(playing) fatal(0, "got SM_PLAY but already playing something");
769 t = findtrack(sm.id, 1);
770 if(fd != -1) acquire(t, fd);
771 playing = t;
8023f60b 772 play(bufsize);
460b9539 773 report();
774 break;
775 case SM_PAUSE:
776 D(("SM_PAUSE"));
777 paused = 1;
778 report();
779 break;
780 case SM_RESUME:
781 D(("SM_RESUME"));
782 if(paused) {
783 paused = 0;
784 if(playing)
8023f60b 785 play(bufsize);
460b9539 786 }
787 report();
788 break;
789 case SM_CANCEL:
790 D(("SM_CANCEL %s", sm.id));
791 t = removetrack(sm.id);
792 if(t) {
793 if(t == playing) {
794 sm.type = SM_FINISHED;
795 strcpy(sm.id, playing->id);
796 speaker_send(1, &sm, 0);
797 playing = 0;
798 }
799 destroy(t);
800 } else
801 error(0, "SM_CANCEL for unknown track %s", sm.id);
802 report();
803 break;
804 case SM_RELOAD:
805 D(("SM_RELOAD"));
806 if(config_read()) error(0, "cannot read configuration");
807 info("reloaded configuration");
808 break;
809 default:
810 error(0, "unknown message type %d", sm.type);
811 }
812 }
813 /* Read in any buffered data */
814 for(t = tracks; t; t = t->next)
9d5da576 815 if(t->slot != -1 && (fds[t->slot].revents & (POLLIN | POLLHUP)))
460b9539 816 fill(t);
817 /* We might be able to play now */
9d5da576 818 if(ready && forceplay && playing && !paused)
460b9539 819 play(forceplay);
820 /* Maybe we finished playing a track somewhere in the above */
821 maybe_finished();
822 /* If we don't need the sound device for now then close it for the benefit
823 * of anyone else who wants it. */
9d5da576 824 if((!playing || paused) && ready)
460b9539 825 idle();
826 /* If we've not reported out state for a second do so now. */
827 if(time(0) > last_report)
828 report();
829 }
830 info("stopped (parent terminated)");
831 exit(0);
832}
833
834/*
835Local Variables:
836c-basic-offset:2
837comment-column:40
838fill-column:79
839indent-tabs-mode:nil
840End:
841*/