1 /*
2  * Copyright (c) 2022 Omar Polo <op@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/queue.h>
19 #include <sys/uio.h>
20 
21 #include <limits.h>
22 
23 #include <assert.h>
24 #include <errno.h>
25 #include <event.h>
26 #include <poll.h>
27 #include <signal.h>
28 #include <sndio.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <stdint.h>
32 #include <imsg.h>
33 #include <string.h>
34 #include <syslog.h>
35 #include <unistd.h>
36 
37 #include "amused.h"
38 #include "log.h"
39 #include "xmalloc.h"
40 
41 struct sio_hdl		*hdl;
42 struct sio_par		 par;
43 struct pollfd		*player_pfds;
44 static struct imsgbuf	*ibuf;
45 
46 static int stopped = 1;
47 static int nextfd = -1;
48 static int64_t samples;
49 
50 volatile sig_atomic_t halted;
51 
52 void
53 player_signal_handler(int signo)
54 {
55 	halted = 1;
56 }
57 
58 int
59 player_setup(int bits, int rate, int channels)
60 {
61 	int nfds, fpct;
62 
63 	log_debug("%s: bits=%d, rate=%d, channels=%d", __func__,
64 	    bits, rate, channels);
65 
66 	fpct = (rate*5)/100;
67 
68 	/* don't stop if the parameters are the same */
69 	if (bits == par.bits && channels == par.pchan &&
70 	    par.rate - fpct <= rate && rate <= par.rate + fpct) {
71 		if (stopped)
72 			goto start;
73 		return 0;
74 	}
75 
76 again:
77 	if (!stopped) {
78 		sio_stop(hdl);
79 		stopped = 1;
80 	}
81 
82 	sio_initpar(&par);
83 	par.bits = bits;
84 	par.rate = rate;
85 	par.pchan = channels;
86 	if (!sio_setpar(hdl, &par)) {
87 		if (errno == EAGAIN) {
88 			nfds = sio_pollfd(hdl, player_pfds + 1, POLLOUT);
89 			if (poll(player_pfds + 1, nfds, INFTIM) == -1)
90 				fatal("poll");
91 			goto again;
92 		}
93 		log_warnx("invalid params (bits=%d, rate=%d, channels=%d",
94 		    bits, rate, channels);
95 		return -1;
96 	}
97 	if (!sio_getpar(hdl, &par)) {
98 		log_warnx("can't get params");
99 		return -1;
100 	}
101 
102 	if (par.bits != bits || par.pchan != channels) {
103 		log_warnx("failed to set params");
104 		return -1;
105 	}
106 
107 	/* TODO: check the sample rate? */
108 
109 start:
110 	if (!sio_start(hdl)) {
111 		log_warn("sio_start");
112 		return -1;
113 	}
114 	stopped = 0;
115 	return 0;
116 }
117 
118 void
119 player_setduration(int64_t duration)
120 {
121 	int64_t seconds;
122 
123 	seconds = duration / par.rate;
124 	imsg_compose(ibuf, IMSG_LEN, 0, 0, -1, &seconds, sizeof(seconds));
125 	imsg_flush(ibuf);
126 }
127 
128 void
129 player_onmove(void *arg, int delta)
130 {
131 	static int64_t reported;
132 	int64_t sec;
133 
134 	samples += delta;
135 	if (llabs(samples - reported) >= par.rate) {
136 		reported = samples;
137 		sec = samples / par.rate;
138 
139 		imsg_compose(ibuf, IMSG_POS, 0, 0, -1, &sec, sizeof(sec));
140 		imsg_flush(ibuf);
141 	}
142 }
143 
144 /* process only one message */
145 int
146 player_dispatch(void)
147 {
148 	struct pollfd	pfd;
149 	struct imsg	imsg;
150 	ssize_t		n;
151 	int		ret;
152 
153 	if (halted != 0)
154 		return IMSG_STOP;
155 
156 again:
157 	if ((n = imsg_get(ibuf, &imsg)) == -1)
158 		fatal("imsg_get");
159 	if (n == 0) {
160 		pfd.fd = ibuf->fd;
161 		pfd.events = POLLIN;
162 		if (poll(&pfd, 1, INFTIM) == -1)
163 			fatal("poll");
164 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
165 			fatal("imsg_read");
166 		if (n == 0)
167 			fatalx("pipe closed");
168 		goto again;
169 	}
170 
171 	ret = imsg.hdr.type;
172 	switch (imsg.hdr.type) {
173 	case IMSG_PLAY:
174 		if (nextfd != -1)
175 			fatalx("track already enqueued");
176 		if ((nextfd = imsg.fd) == -1)
177 			fatalx("%s: got invalid file descriptor", __func__);
178 		log_debug("song enqueued");
179 		ret = IMSG_STOP;
180 		break;
181 	case IMSG_RESUME:
182 	case IMSG_PAUSE:
183 	case IMSG_STOP:
184 		break;
185 	default:
186 		fatalx("unknown imsg %d", imsg.hdr.type);
187 	}
188 
189 	imsg_free(&imsg);
190 	return ret;
191 }
192 
193 void
194 player_senderr(const char *errstr)
195 {
196 	size_t len = 0;
197 
198 	if (errstr != NULL)
199 		len = strlen(errstr) + 1;
200 
201 	imsg_compose(ibuf, IMSG_ERR, 0, 0, -1, errstr, len);
202 	imsg_flush(ibuf);
203 }
204 
205 void
206 player_sendeof(void)
207 {
208 	imsg_compose(ibuf, IMSG_EOF, 0, 0, -1, NULL, 0);
209 	imsg_flush(ibuf);
210 }
211 
212 int
213 player_playnext(const char **errstr)
214 {
215 	static char buf[512];
216 	ssize_t r;
217 	int fd = nextfd;
218 
219 	assert(nextfd != -1);
220 	nextfd = -1;
221 
222 	/* reset samples and set position to zero */
223 	samples = 0;
224 	imsg_compose(ibuf, IMSG_POS, 0, 0, -1, &samples, sizeof(samples));
225 	imsg_flush(ibuf);
226 
227 	r = read(fd, buf, sizeof(buf));
228 
229 	/* 8 byte is the larger magic number */
230 	if (r < 8) {
231 		*errstr = "read failed";
232 		goto err;
233 	}
234 
235 	if (lseek(fd, 0, SEEK_SET) == -1) {
236 		*errstr = "lseek failed";
237 		goto err;
238 	}
239 
240 	if (memcmp(buf, "fLaC", 4) == 0)
241 		return play_flac(fd, errstr);
242 	if (memcmp(buf, "ID3", 3) == 0 ||
243 	    memcmp(buf, "\xFF\xFB", 2) == 0)
244 		return play_mp3(fd, errstr);
245 	if (memmem(buf, r, "OpusHead", 8) != NULL)
246 		return play_opus(fd, errstr);
247 	if (memmem(buf, r, "OggS", 4) != NULL)
248 		return play_oggvorbis(fd, errstr);
249 
250 	*errstr = "unknown file type";
251 err:
252 	close(fd);
253 	return -1;
254 }
255 
256 int
257 player_pause(void)
258 {
259 	int r;
260 
261 	r = player_dispatch();
262 	return r == IMSG_RESUME;
263 }
264 
265 int
266 player_shouldstop(void)
267 {
268 	switch (player_dispatch()) {
269 	case IMSG_PAUSE:
270 		if (player_pause())
271 			break;
272 		/* fallthrough */
273 	case IMSG_STOP:
274 		return 1;
275 	}
276 
277 	return 0;
278 }
279 
280 int
281 play(const void *buf, size_t len)
282 {
283 	size_t w;
284 	int nfds, revents, r;
285 
286 	while (len != 0) {
287 		nfds = sio_pollfd(hdl, player_pfds + 1, POLLOUT);
288 		r = poll(player_pfds, nfds + 1, INFTIM);
289 		if (r == -1)
290 			fatal("poll");
291 
292 		if (player_pfds[0].revents & (POLLHUP|POLLIN)) {
293 			if (player_shouldstop()) {
294 				sio_flush(hdl);
295 				stopped = 1;
296 				return 0;
297 			}
298 		}
299 
300 		revents = sio_revents(hdl, player_pfds + 1);
301 		if (revents & POLLHUP)
302 			fatalx("sndio hang-up");
303 		if (revents & POLLOUT) {
304 			w = sio_write(hdl, buf, len);
305 			len -= w;
306 			buf += w;
307 		}
308 	}
309 
310 	return 1;
311 }
312 
313 int
314 player(int debug, int verbose)
315 {
316 	int r;
317 
318 	log_init(debug, LOG_DAEMON);
319 	log_setverbose(verbose);
320 
321 	setproctitle("player");
322 	log_procinit("player");
323 
324 #if 0
325 	{
326 		static int attached;
327 
328 		while (!attached)
329 			sleep(1);
330 	}
331 #endif
332 
333 	if ((hdl = sio_open(SIO_DEVANY, SIO_PLAY, 1)) == NULL)
334 		fatal("sio_open");
335 
336 	sio_onmove(hdl, player_onmove, NULL);
337 
338 	/* allocate one extra for imsg */
339 	player_pfds = calloc(sio_nfds(hdl) + 1, sizeof(*player_pfds));
340 	if (player_pfds == NULL)
341 		fatal("calloc");
342 
343 	player_pfds[0].events = POLLIN;
344 	player_pfds[0].fd = 3;
345 
346 	ibuf = xmalloc(sizeof(*ibuf));
347 	imsg_init(ibuf, 3);
348 
349 	signal(SIGINT, player_signal_handler);
350 	signal(SIGTERM, player_signal_handler);
351 
352 	signal(SIGHUP, SIG_IGN);
353 	signal(SIGPIPE, SIG_IGN);
354 
355 	if (pledge("stdio recvfd audio", NULL) == -1)
356 		fatal("pledge");
357 
358 	while (!halted) {
359 		const char *errstr = NULL;
360 
361 		while (nextfd == -1)
362 			player_dispatch();
363 
364 		r = player_playnext(&errstr);
365 		if (r == -1)
366 			player_senderr(errstr);
367 		if (r == 0)
368 			player_sendeof();
369 	}
370 
371 	return 0;
372 }