1 /*-
2 * Copyright (c) 2015-2019 Hans Petter Selasky
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23 * SUCH DAMAGE.
24 */
25
26 #include <sys/queue.h>
27 #include <sys/filio.h>
28 #include <sys/soundcard.h>
29
30 #include <stdint.h>
31 #include <stdlib.h>
32 #include <string.h>
33 #include <fcntl.h>
34 #include <unistd.h>
35 #include <err.h>
36 #include <poll.h>
37
38 #include "backend.h"
39 #include "int.h"
40
41 static int
oss_set_format(int fd,int * format)42 oss_set_format(int fd, int *format)
43 {
44 int value[6];
45 int error;
46 int fmt;
47 int i;
48
49 value[0] = *format & VPREFERRED_SNE_AFMT;
50 value[1] = *format & VPREFERRED_UNE_AFMT;
51 value[2] = *format & VPREFERRED_SLE_AFMT;
52 value[3] = *format & VPREFERRED_SBE_AFMT;
53 value[4] = *format & VPREFERRED_ULE_AFMT;
54 value[5] = *format & VPREFERRED_UBE_AFMT;
55
56 for (i = 0; i != 6; i++) {
57 fmt = value[i];
58 if (fmt == 0)
59 continue;
60 error = ioctl(fd, SNDCTL_DSP_SETFMT, &fmt);
61 /* make sure we got the format we asked for */
62 if (error == 0 && fmt == value[i]) {
63 *format = fmt;
64 return (0);
65 }
66 }
67 return (-1);
68 }
69
70 static void
oss_close(struct voss_backend * pbe)71 oss_close(struct voss_backend *pbe)
72 {
73 if (pbe->fd > -1) {
74 close(pbe->fd);
75 pbe->fd = -1;
76 }
77 }
78
79 static int
oss_open(struct voss_backend * pbe,const char * devname,int samplerate,int bufsize,int * pchannels,int * pformat,int attr,int fionbio)80 oss_open(struct voss_backend *pbe, const char *devname, int samplerate,
81 int bufsize, int *pchannels, int *pformat, int attr, int fionbio)
82 {
83 int temp;
84 int err;
85
86 pbe->fd = open(devname, attr);
87 if (pbe->fd < 0) {
88 warn("Could not open DSP device '%s'", devname);
89 return (-1);
90 }
91 err = ioctl(pbe->fd, FIONBIO, &fionbio);
92 if (err < 0) {
93 warn("Could not set blocking mode on DSP");
94 goto error;
95 }
96 err = oss_set_format(pbe->fd, pformat);
97 if (err < 0) {
98 warn("Could not set sample format 0x%08x", *pformat);
99 goto error;
100 }
101 temp = *pchannels;
102 bufsize /= temp; /* get buffer size per channel */
103 do {
104 err = ioctl(pbe->fd, SOUND_PCM_WRITE_CHANNELS, &temp);
105 } while (err < 0 && --temp > 0);
106
107 err = ioctl(pbe->fd, SOUND_PCM_READ_CHANNELS, &temp);
108 if (err < 0 || temp <= 0 || temp > *pchannels) {
109 warn("Could not set DSP channels: %d / %d", temp, *pchannels);
110 goto error;
111 }
112 *pchannels = temp;
113
114 temp = samplerate;
115 err = ioctl(pbe->fd, SNDCTL_DSP_SPEED, &temp);
116 if (err < 0 || temp != samplerate) {
117 warn("Could not set sample rate to %d / %d Hz", temp, samplerate);
118 goto error;
119 }
120
121 temp = bufsize * (*pchannels);
122 err = ioctl(pbe->fd, SNDCTL_DSP_SETBLKSIZE, &temp);
123 if (err < 0) {
124 warn("Could not set block size to %d", temp);
125 goto error;
126 }
127 return (0);
128 error:
129 close(pbe->fd);
130 pbe->fd = -1;
131 return (-1);
132 }
133
134 static int
oss_rec_open(struct voss_backend * pbe,const char * devname,int samplerate,int bufsize,int * pchannels,int * pformat)135 oss_rec_open(struct voss_backend *pbe, const char *devname, int samplerate,
136 int bufsize, int *pchannels, int *pformat)
137 {
138 return (oss_open(pbe, devname, samplerate, bufsize, pchannels, pformat, O_RDONLY, 0));
139 }
140
141 static int
oss_play_open(struct voss_backend * pbe,const char * devname,int samplerate,int bufsize,int * pchannels,int * pformat)142 oss_play_open(struct voss_backend *pbe, const char *devname, int samplerate,
143 int bufsize, int *pchannels, int *pformat)
144 {
145 bufsize *= 4; /* XXX allow extra space for jitter */
146 return (oss_open(pbe, devname, samplerate, bufsize, pchannels, pformat, O_WRONLY, 0));
147 }
148
149 static int
oss_rec_transfer(struct voss_backend * pbe,void * ptr,int len)150 oss_rec_transfer(struct voss_backend *pbe, void *ptr, int len)
151 {
152 struct pollfd fds = { .fd = pbe->fd, .events = POLLIN | POLLRDNORM };
153 int err;
154
155 /* wait at maximum 2 seconds for data, else something is wrong */
156 err = poll(&fds, 1, 2000);
157 if (err < 1)
158 return (-1);
159 return (read(pbe->fd, ptr, len));
160 }
161
162 static int
oss_play_transfer(struct voss_backend * pbe,void * ptr,int len)163 oss_play_transfer(struct voss_backend *pbe, void *ptr, int len)
164 {
165 return (write(pbe->fd, ptr, len));
166 }
167
168 static void
oss_rec_delay(struct voss_backend * pbe,int * pdelay)169 oss_rec_delay(struct voss_backend *pbe, int *pdelay)
170 {
171 if (ioctl(pbe->fd, FIONREAD, pdelay) != 0)
172 *pdelay = -1;
173 }
174
175 static void
oss_play_delay(struct voss_backend * pbe,int * pdelay)176 oss_play_delay(struct voss_backend *pbe, int *pdelay)
177 {
178 if (voss_has_synchronization != 0 ||
179 ioctl(pbe->fd, SNDCTL_DSP_GETODELAY, pdelay) != 0)
180 *pdelay = -1;
181 }
182
183 struct voss_backend voss_backend_oss_rec = {
184 .open = oss_rec_open,
185 .close = oss_close,
186 .transfer = oss_rec_transfer,
187 .delay = oss_rec_delay,
188 .fd = -1,
189 };
190
191 struct voss_backend voss_backend_oss_play = {
192 .open = oss_play_open,
193 .close = oss_close,
194 .transfer = oss_play_transfer,
195 .delay = oss_play_delay,
196 .fd = -1,
197 };
198