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 <fcntl.h>
27 #include <poll.h>
28 #include <signal.h>
29 #include <sndio.h>
30 #include <stdio.h>
31 #include <stdlib.h>
32 #include <stdint.h>
33 #include <imsg.h>
34 #include <string.h>
35 #include <syslog.h>
36 #include <unistd.h>
37 
38 #include "amused.h"
39 #include "log.h"
40 #include "xmalloc.h"
41 
42 static struct imsgbuf *ibuf;
43 
44 static int got_stop;
45 static int nextfd = -1;
46 static char nextpath[PATH_MAX];
47 
48 volatile sig_atomic_t halted;
49 
50 static void
51 player_signal_handler(int signo)
52 {
53 	halted = 1;
54 }
55 
56 static void
57 audio_init(void)
58 {
59 	struct sio_par par;
60 
61 	if ((hdl = sio_open(SIO_DEVANY, SIO_PLAY, 0)) == NULL)
62 		fatal("sio_open");
63 
64 	sio_initpar(&par);
65 	par.bits = 16;
66 	par.appbufsz = 50 * par.rate / 1000;
67 	par.pchan = 2;
68 	if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par))
69 		fatal("couldn't set audio params");
70 	if (par.bits != 16 || par.le != SIO_LE_NATIVE)
71 		fatalx("unsupported audio params");
72 	if (!sio_start(hdl))
73 		fatal("sio_start");
74 }
75 
76 int
77 player_setup(int bits, int rate, int channels)
78 {
79 	struct sio_par par;
80 
81 	log_debug("%s: bits=%d, rate=%d, channels=%d", __func__,
82 	    bits, rate, channels);
83 
84 	sio_stop(hdl);
85 
86 	sio_initpar(&par);
87 	par.bits = bits;
88 	par.rate = rate;
89 	par.pchan = channels;
90 	if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par)) {
91 		log_warnx("invalid params");
92 		return -1;
93 	}
94 
95 	if (par.bits != bits || par.pchan != channels) {
96 		log_warnx("failed to set params");
97 		return -1;
98 	}
99 
100 	/* TODO: check the sample rate? */
101 
102 	if (!sio_start(hdl)) {
103 		log_warn("sio_start");
104 		return -1;
105 	}
106 	return 0;
107 }
108 
109 int
110 player_pendingimsg(void)
111 {
112 	struct pollfd pfd;
113 	int r;
114 
115 	if (halted != 0)
116 		return 1;
117 
118 	pfd.fd = ibuf->fd;
119 	pfd.events = POLLIN;
120 
121 	r = poll(&pfd, 1, 0);
122 	if (r == -1)
123 		fatal("poll");
124 	return r;
125 }
126 
127 void
128 player_enqueue(struct imsg *imsg)
129 {
130 	size_t datalen;
131 
132 	if (nextfd != -1)
133 		fatalx("track already enqueued");
134 
135 	datalen = IMSG_DATA_SIZE(*imsg);
136 	if (datalen != sizeof(nextpath))
137 		fatalx("%s: size mismatch", __func__);
138 	memcpy(nextpath, imsg->data, sizeof(nextpath));
139 	if (nextpath[datalen-1] != '\0')
140 		fatalx("%s: corrupted path", __func__);
141 	if ((nextfd = imsg->fd) == -1)
142 		fatalx("%s: got invalid file descriptor", __func__);
143 	log_debug("enqueued %s", nextpath);
144 }
145 
146 /* process only one message */
147 int
148 player_dispatch(void)
149 {
150 	struct imsg	imsg;
151 	ssize_t		n;
152 	int		ret;
153 
154 	if (halted != 0)
155 		return IMSG_STOP;
156 
157 	if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
158 		fatalx("imsg_read");
159 	if (n == 0)
160 		fatalx("pipe closed");
161 
162 	if ((n = imsg_get(ibuf, &imsg)) == -1)
163 		fatal("imsg_get");
164 	if (n == 0) /* no more messages */
165 		fatalx("expected at least a message");
166 
167 	ret = imsg.hdr.type;
168 	if (ret == IMSG_STOP)
169 		got_stop = 1;
170 	switch (imsg.hdr.type) {
171 	case IMSG_PLAY:
172 		player_enqueue(&imsg);
173 		ret = IMSG_STOP;
174 		break;
175 	case IMSG_RESUME:
176 	case IMSG_PAUSE:
177 	case IMSG_STOP:
178 		break;
179 	default:
180 		fatalx("unknown imsg %d", imsg.hdr.type);
181 	}
182 
183 	return ret;
184 }
185 
186 void
187 player_senderr(void)
188 {
189 	imsg_compose(ibuf, IMSG_ERR, 0, 0, -1, NULL, 0);
190 	imsg_flush(ibuf);
191 }
192 
193 void
194 player_sendeof(void)
195 {
196 	imsg_compose(ibuf, IMSG_EOF, 0, 0, -1, NULL, 0);
197 	imsg_flush(ibuf);
198 }
199 
200 int
201 player_playnext(void)
202 {
203 	int fd = nextfd;
204 
205 	assert(nextfd != -1);
206 	nextfd = -1;
207 
208 	/* XXX: use magic(5) for this, not file extensions */
209 	if (strstr(nextpath, ".ogg") != NULL)
210 		play_oggvorbis(fd);
211 	else if (strstr(nextpath, ".mp3") != NULL)
212 		play_mp3(fd);
213 	else if (strstr(nextpath, ".flac") != NULL)
214 		play_flac(fd);
215 	else if (strstr(nextpath, ".opus") != NULL)
216 		play_opus(fd);
217 	else {
218 		log_warnx("unknown file type for %s", nextpath);
219 		player_senderr();
220 		return 0;
221 	}
222 
223 	return 1;
224 }
225 
226 int
227 player_pause(void)
228 {
229 	int r;
230 
231 	r = player_dispatch();
232 	return r == IMSG_RESUME;
233 }
234 
235 int
236 player_shouldstop(void)
237 {
238 	if (!player_pendingimsg())
239 		return 0;
240 
241 	switch (player_dispatch()) {
242 	case IMSG_PAUSE:
243 		if (player_pause())
244 			break;
245 		/* fallthrough */
246 	case IMSG_STOP:
247 		return 1;
248 	}
249 
250 	return 0;
251 }
252 
253 int
254 play(const void *buf, size_t len)
255 {
256 	if (player_shouldstop())
257 		return 0;
258 	sio_write(hdl, buf, len);
259 	return 1;
260 }
261 
262 int
263 player(int debug, int verbose)
264 {
265 	int flags;
266 	log_init(debug, LOG_DAEMON);
267 	log_setverbose(verbose);
268 
269 	setproctitle("player");
270 	log_procinit("player");
271 
272 #if 0
273 	{
274 		static int attached;
275 
276 		while (!attached)
277 			sleep(1);
278 	}
279 #endif
280 
281 	audio_init();
282 
283 	/* mark fd as blocking i/o mode */
284 	if ((flags = fcntl(3, F_GETFL)) == -1)
285 		fatal("fcntl(F_GETFL)");
286 	if (fcntl(3, F_SETFL, flags & ~O_NONBLOCK) == -1)
287 		fatal("fcntl F_SETFL O_NONBLOCK");
288 
289 	ibuf = xmalloc(sizeof(*ibuf));
290 	imsg_init(ibuf, 3);
291 
292 	signal(SIGINT, player_signal_handler);
293 	signal(SIGTERM, player_signal_handler);
294 
295 	signal(SIGHUP, SIG_IGN);
296 	signal(SIGPIPE, SIG_IGN);
297 
298 	if (pledge("stdio recvfd", NULL) == -1)
299 		fatal("pledge");
300 
301 	while (!halted) {
302 		while (nextfd == -1)
303 			player_dispatch();
304 
305 		if (player_playnext() && !got_stop)
306 			player_sendeof();
307 		else
308 			got_stop = 0;
309 	}
310 
311 	return 0;
312 }