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 static struct imsgbuf	*ibuf;
43 
44 static int nextfd = -1;
45 
46 volatile sig_atomic_t halted;
47 
48 void
49 player_signal_handler(int signo)
50 {
51 	halted = 1;
52 }
53 
54 void
55 player_init(void)
56 {
57 	if ((hdl = sio_open(SIO_DEVANY, SIO_PLAY, 0)) == NULL)
58 		fatal("sio_open");
59 
60 	if (!sio_start(hdl))
61 		fatal("sio_start");
62 }
63 
64 int
65 player_setup(int bits, int rate, int channels)
66 {
67 	struct sio_par par;
68 
69 	log_debug("%s: bits=%d, rate=%d, channels=%d", __func__,
70 	    bits, rate, channels);
71 
72 	sio_stop(hdl);
73 
74 	sio_initpar(&par);
75 	par.bits = bits;
76 	par.rate = rate;
77 	par.pchan = channels;
78 	if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par)) {
79 		log_warnx("invalid params (bits=%d, rate=%d, channels=%d",
80 		    bits, rate, channels);
81 		return -1;
82 	}
83 
84 	if (par.bits != bits || par.pchan != channels) {
85 		log_warnx("failed to set params");
86 		return -1;
87 	}
88 
89 	/* TODO: check the sample rate? */
90 
91 	if (!sio_start(hdl)) {
92 		log_warn("sio_start");
93 		return -1;
94 	}
95 	return 0;
96 }
97 
98 int
99 player_pendingimsg(void)
100 {
101 	struct pollfd pfd;
102 	int r;
103 
104 	if (halted != 0)
105 		return 1;
106 
107 	pfd.fd = ibuf->fd;
108 	pfd.events = POLLIN;
109 
110 	r = poll(&pfd, 1, 0);
111 	if (r == -1)
112 		fatal("poll");
113 	return r;
114 }
115 
116 /* process only one message */
117 int
118 player_dispatch(void)
119 {
120 	struct pollfd	pfd;
121 	struct imsg	imsg;
122 	ssize_t		n;
123 	int		ret;
124 
125 	if (halted != 0)
126 		return IMSG_STOP;
127 
128 again:
129 	if ((n = imsg_get(ibuf, &imsg)) == -1)
130 		fatal("imsg_get");
131 	if (n == 0) {
132 		pfd.fd = ibuf->fd;
133 		pfd.events = POLLIN;
134 		if (poll(&pfd, 1, INFTIM) == -1)
135 			fatal("poll");
136 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
137 			fatal("imsg_read");
138 		if (n == 0)
139 			fatalx("pipe closed");
140 		goto again;
141 	}
142 
143 	ret = imsg.hdr.type;
144 	switch (imsg.hdr.type) {
145 	case IMSG_PLAY:
146 		if (nextfd != -1)
147 			fatalx("track already enqueued");
148 		if ((nextfd = imsg.fd) == -1)
149 			fatalx("%s: got invalid file descriptor", __func__);
150 		log_debug("song enqueued");
151 		ret = IMSG_STOP;
152 		break;
153 	case IMSG_RESUME:
154 	case IMSG_PAUSE:
155 	case IMSG_STOP:
156 		break;
157 	default:
158 		fatalx("unknown imsg %d", imsg.hdr.type);
159 	}
160 
161 	return ret;
162 }
163 
164 void
165 player_senderr(void)
166 {
167 	imsg_compose(ibuf, IMSG_ERR, 0, 0, -1, NULL, 0);
168 	imsg_flush(ibuf);
169 }
170 
171 void
172 player_sendeof(void)
173 {
174 	imsg_compose(ibuf, IMSG_EOF, 0, 0, -1, NULL, 0);
175 	imsg_flush(ibuf);
176 }
177 
178 int
179 player_playnext(void)
180 {
181 	static char buf[512];
182 	ssize_t r;
183 	int fd = nextfd;
184 
185 	assert(nextfd != -1);
186 	nextfd = -1;
187 
188 	r = read(fd, buf, sizeof(buf));
189 
190 	/* 8 byte is the larger magic number */
191 	if (r < 8) {
192 		log_warn("read failed");
193 		goto err;
194 	}
195 
196 	if (lseek(fd, 0, SEEK_SET) == -1) {
197 		log_warn("lseek failed");
198 		goto err;
199 	}
200 
201 	if (memcmp(buf, "fLaC", 4) == 0)
202 		return play_flac(fd);
203 	if (memcmp(buf, "ID3", 3) == 0 ||
204 	    memcmp(buf, "\xFF\xFB", 2) == 0)
205 		return play_mp3(fd);
206 	if (memmem(buf, r, "OpusHead", 8) != NULL)
207 		return play_opus(fd);
208 	if (memmem(buf, r, "OggS", 4) != NULL)
209 		return play_oggvorbis(fd);
210 
211 	log_warnx("unknown file type");
212 err:
213 	close(fd);
214 	return -1;
215 }
216 
217 int
218 player_pause(void)
219 {
220 	int r;
221 
222 	r = player_dispatch();
223 	return r == IMSG_RESUME;
224 }
225 
226 int
227 player_shouldstop(void)
228 {
229 	if (!player_pendingimsg())
230 		return 0;
231 
232 	switch (player_dispatch()) {
233 	case IMSG_PAUSE:
234 		if (player_pause())
235 			break;
236 		/* fallthrough */
237 	case IMSG_STOP:
238 		return 1;
239 	}
240 
241 	return 0;
242 }
243 
244 int
245 play(const void *buf, size_t len)
246 {
247 	if (player_shouldstop())
248 		return 0;
249 	sio_write(hdl, buf, len);
250 	return 1;
251 }
252 
253 int
254 player(int debug, int verbose)
255 {
256 	int r;
257 
258 	log_init(debug, LOG_DAEMON);
259 	log_setverbose(verbose);
260 
261 	setproctitle("player");
262 	log_procinit("player");
263 
264 #if 0
265 	{
266 		static int attached;
267 
268 		while (!attached)
269 			sleep(1);
270 	}
271 #endif
272 
273 	player_init();
274 
275 	ibuf = xmalloc(sizeof(*ibuf));
276 	imsg_init(ibuf, 3);
277 
278 	signal(SIGINT, player_signal_handler);
279 	signal(SIGTERM, player_signal_handler);
280 
281 	signal(SIGHUP, SIG_IGN);
282 	signal(SIGPIPE, SIG_IGN);
283 
284 	if (pledge("stdio recvfd audio", NULL) == -1)
285 		fatal("pledge");
286 
287 	while (!halted) {
288 		while (nextfd == -1)
289 			player_dispatch();
290 
291 		r = player_playnext();
292 		if (r == -1)
293 			player_senderr();
294 		if (r == 0)
295 			player_sendeof();
296 	}
297 
298 	return 0;
299 }