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 struct sio_hdl		*hdl;
43 static struct imsgbuf	*ibuf;
44 
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 (bits=%d, rate=%d, channels=%d",
92 		    bits, rate, channels);
93 		return -1;
94 	}
95 
96 	if (par.bits != bits || par.pchan != channels) {
97 		log_warnx("failed to set params");
98 		return -1;
99 	}
100 
101 	/* TODO: check the sample rate? */
102 
103 	if (!sio_start(hdl)) {
104 		log_warn("sio_start");
105 		return -1;
106 	}
107 	return 0;
108 }
109 
110 int
111 player_pendingimsg(void)
112 {
113 	struct pollfd pfd;
114 	int r;
115 
116 	if (halted != 0)
117 		return 1;
118 
119 	pfd.fd = ibuf->fd;
120 	pfd.events = POLLIN;
121 
122 	r = poll(&pfd, 1, 0);
123 	if (r == -1)
124 		fatal("poll");
125 	return r;
126 }
127 
128 void
129 player_enqueue(struct imsg *imsg)
130 {
131 	size_t datalen;
132 
133 	if (nextfd != -1)
134 		fatalx("track already enqueued");
135 
136 	datalen = IMSG_DATA_SIZE(*imsg);
137 	if (datalen != sizeof(nextpath))
138 		fatalx("%s: size mismatch", __func__);
139 	memcpy(nextpath, imsg->data, sizeof(nextpath));
140 	if (nextpath[datalen-1] != '\0')
141 		fatalx("%s: corrupted path", __func__);
142 	if ((nextfd = imsg->fd) == -1)
143 		fatalx("%s: got invalid file descriptor", __func__);
144 	log_debug("enqueued %s", nextpath);
145 }
146 
147 /* process only one message */
148 int
149 player_dispatch(void)
150 {
151 	struct imsg	imsg;
152 	ssize_t		n;
153 	int		ret;
154 
155 	if (halted != 0)
156 		return IMSG_STOP;
157 
158 	if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
159 		fatalx("imsg_read");
160 	if (n == 0)
161 		fatalx("pipe closed");
162 
163 	if ((n = imsg_get(ibuf, &imsg)) == -1)
164 		fatal("imsg_get");
165 	if (n == 0) /* no more messages */
166 		fatalx("expected at least a message");
167 
168 	ret = imsg.hdr.type;
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 int
200 player_playnext(void)
201 {
202 	static char buf[512];
203 	ssize_t r;
204 	int fd = nextfd;
205 
206 	assert(nextfd != -1);
207 	nextfd = -1;
208 
209 	r = read(fd, buf, sizeof(buf));
210 
211 	/* 8 byte is the larger magic number */
212 	if (r < 8) {
213 		log_warn("failed to read %s", nextpath);
214 		goto err;
215 	}
216 
217 	if (lseek(fd, 0, SEEK_SET) == -1) {
218 		log_warn("lseek failed");
219 		goto err;
220 	}
221 
222 	if (memcmp(buf, "fLaC", 4) == 0)
223 		return play_flac(fd);
224 	if (memcmp(buf, "ID3", 3) == 0 ||
225 	    memcmp(buf, "\xFF\xFB", 2) == 0)
226 		return play_mp3(fd);
227 	if (memmem(buf, r, "OpusHead", 8) != NULL)
228 		return play_opus(fd);
229 	if (memmem(buf, r, "OggS", 4) != NULL)
230 		return play_oggvorbis(fd);
231 
232 	log_warnx("unknown file type for %s", nextpath);
233 err:
234 	close(fd);
235 	return -1;
236 }
237 
238 int
239 player_pause(void)
240 {
241 	int r;
242 
243 	r = player_dispatch();
244 	return r == IMSG_RESUME;
245 }
246 
247 int
248 player_shouldstop(void)
249 {
250 	if (!player_pendingimsg())
251 		return 0;
252 
253 	switch (player_dispatch()) {
254 	case IMSG_PAUSE:
255 		if (player_pause())
256 			break;
257 		/* fallthrough */
258 	case IMSG_STOP:
259 		return 1;
260 	}
261 
262 	return 0;
263 }
264 
265 int
266 play(const void *buf, size_t len)
267 {
268 	if (player_shouldstop())
269 		return 0;
270 	sio_write(hdl, buf, len);
271 	return 1;
272 }
273 
274 int
275 player(int debug, int verbose)
276 {
277 	int flags;
278 	log_init(debug, LOG_DAEMON);
279 	log_setverbose(verbose);
280 
281 	setproctitle("player");
282 	log_procinit("player");
283 
284 #if 0
285 	{
286 		static int attached;
287 
288 		while (!attached)
289 			sleep(1);
290 	}
291 #endif
292 
293 	audio_init();
294 
295 	/* mark fd as blocking i/o mode */
296 	if ((flags = fcntl(3, F_GETFL)) == -1)
297 		fatal("fcntl(F_GETFL)");
298 	if (fcntl(3, F_SETFL, flags & ~O_NONBLOCK) == -1)
299 		fatal("fcntl F_SETFL O_NONBLOCK");
300 
301 	ibuf = xmalloc(sizeof(*ibuf));
302 	imsg_init(ibuf, 3);
303 
304 	signal(SIGINT, player_signal_handler);
305 	signal(SIGTERM, player_signal_handler);
306 
307 	signal(SIGHUP, SIG_IGN);
308 	signal(SIGPIPE, SIG_IGN);
309 
310 	if (pledge("stdio recvfd audio", NULL) == -1)
311 		fatal("pledge");
312 
313 	while (!halted) {
314 		while (nextfd == -1)
315 			player_dispatch();
316 
317 		if (player_playnext() == -1)
318 			player_senderr();
319 		else
320 			player_sendeof();
321 	}
322 
323 	return 0;
324 }