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> |
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43 | #include <sys/wait.h> |
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44 | #include <time.h> |
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45 | #include <fcntl.h> |
46 | #include <poll.h> |
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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 | |
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56 | #if API_ALSA |
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57 | #include <alsa/asoundlib.h> |
8023f60b |
58 | #endif |
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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. */ |
69 | static 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 | |
83 | static time_t last_report; /* when we last reported */ |
84 | static int paused; /* pause status */ |
460b9539 |
85 | static ao_sample_format pcm_format; /* current format if aodev != 0 */ |
86 | static size_t bpf; /* bytes per frame */ |
87 | static struct pollfd fds[NFDS]; /* if we need more than that */ |
88 | static int fdno; /* fd number */ |
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89 | static size_t bufsize; /* buffer size */ |
90 | #if API_ALSA |
91 | static snd_pcm_t *pcm; /* current pcm handle */ |
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92 | static snd_pcm_uframes_t last_pcm_bufsize; /* last seen buffer size */ |
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93 | #endif |
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94 | static int ready; /* ready to send audio */ |
460b9539 |
95 | static int forceplay; /* frames to force play */ |
9d5da576 |
96 | static int kidfd = -1; /* child process input */ |
460b9539 |
97 | |
98 | static 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. */ |
108 | static 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. */ |
124 | static 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. */ |
131 | static 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. */ |
136 | static 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). */ |
156 | static 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. */ |
168 | static 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. */ |
176 | static 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. */ |
185 | static 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. */ |
232 | static 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. */ |
241 | static void idle(void) { |
460b9539 |
242 | D(("idle")); |
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243 | #if API_ALSA |
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244 | if(pcm) { |
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245 | int err; |
246 | |
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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 | } |
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257 | #endif |
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258 | ready = 0; |
460b9539 |
259 | } |
260 | |
261 | /* Abandon the current track */ |
262 | static 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 | |
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276 | #if API_ALSA |
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277 | static 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 |
303 | static 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; |
312 | case AO_FMT_BIG: *(*pp)++ = "-B"; |
313 | case AO_FMT_LITTLE: *(*pp)++ = "-L"; |
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. */ |
321 | static 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; |
464 | fatal: |
465 | abandon(); |
466 | error: |
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 */ |
477 | static 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 |
485 | static 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 |
503 | static 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. */ |
598 | static 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 |
611 | static 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 |
621 | static 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 | |
630 | int 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 | /* |
835 | Local Variables: |
836 | c-basic-offset:2 |
837 | comment-column:40 |
838 | fill-column:79 |
839 | indent-tabs-mode:nil |
840 | End: |
841 | */ |