1 /*
2  * Copyright (c) 2023 Omar Polo <op@omarpolo.com>
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 "config.h"
18 
19 #include <errno.h>
20 #include <limits.h>
21 #include <poll.h>
22 #include <sndio.h>
23 #include <stdio.h>
24 
25 #include "amused.h"
26 #include "log.h"
27 
28 static struct sio_hdl		*hdl;
29 static struct sio_par		 par;
30 static int			 stopped = 1;
31 
32 int
33 audio_open(void (*onmove_cb)(void *, int))
34 {
35 	if ((hdl = sio_open(SIO_DEVANY, SIO_PLAY, 1)) == NULL)
36 		return -1;
37 
38 	sio_onmove(hdl, onmove_cb, NULL);
39 	return 0;
40 }
41 
42 int
43 audio_setup(unsigned int bits, unsigned int rate, unsigned int channels,
44     struct pollfd *pfds, int nfds)
45 {
46 	int		 fpct;
47 
48 	fpct = (rate * 5) / 100;
49 
50 	/* don't stop if the parameters are the same */
51 	if (bits == par.bits && channels == par.pchan &&
52 	    par.rate - fpct <= rate && rate <= par.rate + fpct) {
53 		if (stopped)
54 			goto start;
55 		return 0;
56 	}
57 
58  again:
59 	if (!stopped) {
60 		sio_stop(hdl);
61 		stopped = 1;
62 	}
63 
64 	sio_initpar(&par);
65 	par.bits = bits;
66 	par.rate = rate;
67 	par.pchan = channels;
68 	if (!sio_setpar(hdl, &par)) {
69 		if (errno == EAGAIN) {
70 			sio_pollfd(hdl, pfds, POLLOUT);
71 			if (poll(pfds, nfds, INFTIM) == -1)
72 				fatal("poll");
73 			goto again;
74 		}
75 		log_warnx("invalid params (bits=%u, rate=%u, channels=%u)",
76 		    bits, rate, channels);
77 		return -1;
78 	}
79 	if (!sio_getpar(hdl, &par)) {
80 		log_warnx("can't get params");
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 sample rate? */
90 
91  start:
92 	if (!sio_start(hdl)) {
93 		log_warn("sio_start");
94 		return -1;
95 	}
96 	stopped = 0;
97 	return 0;
98 }
99 
100 int
101 audio_nfds(void)
102 {
103 	return sio_nfds(hdl);
104 }
105 
106 int
107 audio_pollfd(struct pollfd *pfds, int nfds, int events)
108 {
109 	return sio_pollfd(hdl, pfds, events);
110 }
111 
112 int
113 audio_revents(struct pollfd *pfds, int nfds)
114 {
115 	return sio_revents(hdl, pfds);
116 }
117 
118 size_t
119 audio_write(const void *buf, size_t len)
120 {
121 	return sio_write(hdl, buf, len);
122 }
123 
124 int
125 audio_flush(void)
126 {
127 	stopped = 1;
128 	return sio_flush(hdl);
129 }
130 
131 int
132 audio_stop(void)
133 {
134 	stopped = 1;
135 	return sio_stop(hdl);
136 }