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