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 static void
49 player_signal_handler(int signo)
50 {
51 	halted = 1;
52 }
53 
54 static void
55 audio_init(void)
56 {
57 	struct sio_par par;
58 
59 	if ((hdl = sio_open(SIO_DEVANY, SIO_PLAY, 0)) == NULL)
60 		fatal("sio_open");
61 
62 	sio_initpar(&par);
63 	par.bits = 16;
64 	par.appbufsz = 50 * par.rate / 1000;
65 	par.pchan = 2;
66 	if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par))
67 		fatal("couldn't set audio params");
68 	if (par.bits != 16 || par.le != SIO_LE_NATIVE)
69 		fatalx("unsupported audio params");
70 	if (!sio_start(hdl))
71 		fatal("sio_start");
72 }
73 
74 int
75 player_setup(int bits, int rate, int channels)
76 {
77 	struct sio_par par;
78 
79 	log_debug("%s: bits=%d, rate=%d, channels=%d", __func__,
80 	    bits, rate, channels);
81 
82 	sio_stop(hdl);
83 
84 	sio_initpar(&par);
85 	par.bits = bits;
86 	par.rate = rate;
87 	par.pchan = channels;
88 	if (!sio_setpar(hdl, &par) || !sio_getpar(hdl, &par)) {
89 		log_warnx("invalid params (bits=%d, rate=%d, channels=%d",
90 		    bits, rate, channels);
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 	if (nextfd != -1)
130 		fatalx("track already enqueued");
131 
132 	if ((nextfd = imsg->fd) == -1)
133 		fatalx("%s: got invalid file descriptor", __func__);
134 	log_debug("song enqueued");
135 }
136 
137 /* process only one message */
138 int
139 player_dispatch(void)
140 {
141 	struct pollfd	pfd;
142 	struct imsg	imsg;
143 	ssize_t		n;
144 	int		ret;
145 
146 	if (halted != 0)
147 		return IMSG_STOP;
148 
149 again:
150 	if ((n = imsg_get(ibuf, &imsg)) == -1)
151 		fatal("imsg_get");
152 	if (n == 0) {
153 		pfd.fd = ibuf->fd;
154 		pfd.events = POLLIN;
155 		if (poll(&pfd, 1, INFTIM) == -1)
156 			fatal("poll");
157 		if ((n = imsg_read(ibuf)) == -1 && errno != EAGAIN)
158 			fatal("imsg_read");
159 		if (n == 0)
160 			fatalx("pipe closed");
161 		goto again;
162 	}
163 
164 	ret = imsg.hdr.type;
165 	switch (imsg.hdr.type) {
166 	case IMSG_PLAY:
167 		player_enqueue(&imsg);
168 		ret = IMSG_STOP;
169 		break;
170 	case IMSG_RESUME:
171 	case IMSG_PAUSE:
172 	case IMSG_STOP:
173 		break;
174 	default:
175 		fatalx("unknown imsg %d", imsg.hdr.type);
176 	}
177 
178 	return ret;
179 }
180 
181 void
182 player_senderr(void)
183 {
184 	imsg_compose(ibuf, IMSG_ERR, 0, 0, -1, NULL, 0);
185 	imsg_flush(ibuf);
186 }
187 
188 void
189 player_sendeof(void)
190 {
191 	imsg_compose(ibuf, IMSG_EOF, 0, 0, -1, NULL, 0);
192 	imsg_flush(ibuf);
193 }
194 
195 int
196 player_playnext(void)
197 {
198 	static char buf[512];
199 	ssize_t r;
200 	int fd = nextfd;
201 
202 	assert(nextfd != -1);
203 	nextfd = -1;
204 
205 	r = read(fd, buf, sizeof(buf));
206 
207 	/* 8 byte is the larger magic number */
208 	if (r < 8) {
209 		log_warn("read failed");
210 		goto err;
211 	}
212 
213 	if (lseek(fd, 0, SEEK_SET) == -1) {
214 		log_warn("lseek failed");
215 		goto err;
216 	}
217 
218 	if (memcmp(buf, "fLaC", 4) == 0)
219 		return play_flac(fd);
220 	if (memcmp(buf, "ID3", 3) == 0 ||
221 	    memcmp(buf, "\xFF\xFB", 2) == 0)
222 		return play_mp3(fd);
223 	if (memmem(buf, r, "OpusHead", 8) != NULL)
224 		return play_opus(fd);
225 	if (memmem(buf, r, "OggS", 4) != NULL)
226 		return play_oggvorbis(fd);
227 
228 	log_warnx("unknown file type");
229 err:
230 	close(fd);
231 	return -1;
232 }
233 
234 int
235 player_pause(void)
236 {
237 	int r;
238 
239 	r = player_dispatch();
240 	return r == IMSG_RESUME;
241 }
242 
243 int
244 player_shouldstop(void)
245 {
246 	if (!player_pendingimsg())
247 		return 0;
248 
249 	switch (player_dispatch()) {
250 	case IMSG_PAUSE:
251 		if (player_pause())
252 			break;
253 		/* fallthrough */
254 	case IMSG_STOP:
255 		return 1;
256 	}
257 
258 	return 0;
259 }
260 
261 int
262 play(const void *buf, size_t len)
263 {
264 	if (player_shouldstop())
265 		return 0;
266 	sio_write(hdl, buf, len);
267 	return 1;
268 }
269 
270 int
271 player(int debug, int verbose)
272 {
273 	int r;
274 
275 	log_init(debug, LOG_DAEMON);
276 	log_setverbose(verbose);
277 
278 	setproctitle("player");
279 	log_procinit("player");
280 
281 #if 0
282 	{
283 		static int attached;
284 
285 		while (!attached)
286 			sleep(1);
287 	}
288 #endif
289 
290 	audio_init();
291 
292 	ibuf = xmalloc(sizeof(*ibuf));
293 	imsg_init(ibuf, 3);
294 
295 	signal(SIGINT, player_signal_handler);
296 	signal(SIGTERM, player_signal_handler);
297 
298 	signal(SIGHUP, SIG_IGN);
299 	signal(SIGPIPE, SIG_IGN);
300 
301 	if (pledge("stdio recvfd audio", NULL) == -1)
302 		fatal("pledge");
303 
304 	while (!halted) {
305 		while (nextfd == -1)
306 			player_dispatch();
307 
308 		r = player_playnext();
309 		if (r == -1)
310 			player_senderr();
311 		if (r == 0)
312 			player_sendeof();
313 	}
314 
315 	return 0;
316 }