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 pollfd		*player_pfds;
43 static struct imsgbuf	*ibuf;
44 
45 static int stopped = 1;
46 static int nextfd = -1;
47 
48 volatile sig_atomic_t halted;
49 
50 void
51 player_signal_handler(int signo)
52 {
53 	halted = 1;
54 }
55 
56 int
57 player_setup(int bits, int rate, int channels)
58 {
59 	struct sio_par par;
60 	int nfds;
61 
62 	log_debug("%s: bits=%d, rate=%d, channels=%d", __func__,
63 	    bits, rate, channels);
64 
65 again:
66 	if (!stopped) {
67 		sio_stop(hdl);
68 		stopped = 1;
69 	}
70 
71 	sio_initpar(&par);
72 	par.bits = bits;
73 	par.rate = rate;
74 	par.pchan = channels;
75 	if (!sio_setpar(hdl, &par)) {
76 		if (errno == EAGAIN) {
77 			nfds = sio_pollfd(hdl, player_pfds + 1, POLLIN|POLLOUT);
78 			if (poll(player_pfds + 1, nfds, INFTIM) == -1)
79 				fatal("poll");
80 			goto again;
81 		}
82 		log_warnx("invalid params (bits=%d, rate=%d, channels=%d",
83 		    bits, rate, channels);
84 		return -1;
85 	}
86 	if (!sio_getpar(hdl, &par)) {
87 		log_warnx("can't get params");
88 		return -1;
89 	}
90 
91 	if (par.bits != bits || par.pchan != channels) {
92 		log_warnx("failed to set params");
93 		return -1;
94 	}
95 
96 	/* TODO: check the sample rate? */
97 
98 	if (!sio_start(hdl)) {
99 		log_warn("sio_start");
100 		return -1;
101 	}
102 	stopped = 0;
103 	return 0;
104 }
105 
106 /* process only one message */
107 int
108 player_dispatch(void)
109 {
110 	struct pollfd	pfd;
111 	struct imsg	imsg;
112 	ssize_t		n;
113 	int		ret;
114 
115 	if (halted != 0)
116 		return IMSG_STOP;
117 
118 again:
119 	if ((n = imsg_get(ibuf, &imsg)) == -1)
120 		fatal("imsg_get");
121 	if (n == 0) {
122 		pfd.fd = ibuf->fd;
123 		pfd.events = POLLIN;
124 		if (poll(&pfd, 1, INFTIM) == -1)
125 			fatal("poll");
126 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
127 			fatal("imsg_read");
128 		if (n == 0)
129 			fatalx("pipe closed");
130 		goto again;
131 	}
132 
133 	ret = imsg.hdr.type;
134 	switch (imsg.hdr.type) {
135 	case IMSG_PLAY:
136 		if (nextfd != -1)
137 			fatalx("track already enqueued");
138 		if ((nextfd = imsg.fd) == -1)
139 			fatalx("%s: got invalid file descriptor", __func__);
140 		log_debug("song enqueued");
141 		ret = IMSG_STOP;
142 		break;
143 	case IMSG_RESUME:
144 	case IMSG_PAUSE:
145 	case IMSG_STOP:
146 		break;
147 	default:
148 		fatalx("unknown imsg %d", imsg.hdr.type);
149 	}
150 
151 	imsg_free(&imsg);
152 	return ret;
153 }
154 
155 void
156 player_senderr(void)
157 {
158 	imsg_compose(ibuf, IMSG_ERR, 0, 0, -1, NULL, 0);
159 	imsg_flush(ibuf);
160 }
161 
162 void
163 player_sendeof(void)
164 {
165 	imsg_compose(ibuf, IMSG_EOF, 0, 0, -1, NULL, 0);
166 	imsg_flush(ibuf);
167 }
168 
169 int
170 player_playnext(void)
171 {
172 	static char buf[512];
173 	ssize_t r;
174 	int fd = nextfd;
175 
176 	assert(nextfd != -1);
177 	nextfd = -1;
178 
179 	r = read(fd, buf, sizeof(buf));
180 
181 	/* 8 byte is the larger magic number */
182 	if (r < 8) {
183 		log_warn("read failed");
184 		goto err;
185 	}
186 
187 	if (lseek(fd, 0, SEEK_SET) == -1) {
188 		log_warn("lseek failed");
189 		goto err;
190 	}
191 
192 	if (memcmp(buf, "fLaC", 4) == 0)
193 		return play_flac(fd);
194 	if (memcmp(buf, "ID3", 3) == 0 ||
195 	    memcmp(buf, "\xFF\xFB", 2) == 0)
196 		return play_mp3(fd);
197 	if (memmem(buf, r, "OpusHead", 8) != NULL)
198 		return play_opus(fd);
199 	if (memmem(buf, r, "OggS", 4) != NULL)
200 		return play_oggvorbis(fd);
201 
202 	log_warnx("unknown file type");
203 err:
204 	close(fd);
205 	return -1;
206 }
207 
208 int
209 player_pause(void)
210 {
211 	int r;
212 
213 	r = player_dispatch();
214 	return r == IMSG_RESUME;
215 }
216 
217 int
218 player_shouldstop(void)
219 {
220 	switch (player_dispatch()) {
221 	case IMSG_PAUSE:
222 		if (player_pause())
223 			break;
224 		/* fallthrough */
225 	case IMSG_STOP:
226 		return 1;
227 	}
228 
229 	return 0;
230 }
231 
232 int
233 play(const void *buf, size_t len)
234 {
235 	size_t w;
236 	int nfds, revents, r;
237 
238 	while (len != 0) {
239 		nfds = sio_pollfd(hdl, player_pfds + 1, POLLOUT);
240 		r = poll(player_pfds, nfds + 1, INFTIM);
241 		if (r == -1)
242 			fatal("poll");
243 
244 		if (player_pfds[0].revents & (POLLHUP|POLLIN)) {
245 			if (player_shouldstop()) {
246 				sio_flush(hdl);
247 				stopped = 1;
248 				return 0;
249 			}
250 		}
251 
252 		revents = sio_revents(hdl, player_pfds + 1);
253 		if (revents & POLLHUP)
254 			fatalx("sndio hang-up");
255 		if (revents & POLLOUT) {
256 			w = sio_write(hdl, buf, len);
257 			len -= w;
258 			buf += w;
259 		}
260 	}
261 
262 	return 1;
263 }
264 
265 int
266 player(int debug, int verbose)
267 {
268 	int r;
269 
270 	log_init(debug, LOG_DAEMON);
271 	log_setverbose(verbose);
272 
273 	setproctitle("player");
274 	log_procinit("player");
275 
276 #if 0
277 	{
278 		static int attached;
279 
280 		while (!attached)
281 			sleep(1);
282 	}
283 #endif
284 
285 	if ((hdl = sio_open(SIO_DEVANY, SIO_PLAY, 1)) == NULL)
286 		fatal("sio_open");
287 
288 	/* allocate one extra for imsg */
289 	player_pfds = calloc(sio_nfds(hdl) + 1, sizeof(*player_pfds));
290 	if (player_pfds == NULL)
291 		fatal("calloc");
292 
293 	player_pfds[0].events = POLLIN;
294 	player_pfds[0].fd = 3;
295 
296 	ibuf = xmalloc(sizeof(*ibuf));
297 	imsg_init(ibuf, 3);
298 
299 	signal(SIGINT, player_signal_handler);
300 	signal(SIGTERM, player_signal_handler);
301 
302 	signal(SIGHUP, SIG_IGN);
303 	signal(SIGPIPE, SIG_IGN);
304 
305 	if (pledge("stdio recvfd audio", NULL) == -1)
306 		fatal("pledge");
307 
308 	while (!halted) {
309 		while (nextfd == -1)
310 			player_dispatch();
311 
312 		r = player_playnext();
313 		if (r == -1)
314 			player_senderr();
315 		if (r == 0)
316 			player_sendeof();
317 	}
318 
319 	return 0;
320 }