1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2016 Alex Teaca <iateaca@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29
30 #include <sys/cdefs.h>
31
32 #ifndef WITHOUT_CAPSICUM
33 #include <sys/capsicum.h>
34 #include <capsicum_helpers.h>
35 #endif
36
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <fcntl.h>
40 #include <sys/ioctl.h>
41 #include <unistd.h>
42 #include <assert.h>
43 #include <errno.h>
44 #include <err.h>
45 #include <sysexits.h>
46
47 #include "audio.h"
48 #include "pci_hda.h"
49
50 /*
51 * Audio Player internal data structures
52 */
53
54 struct audio {
55 int fd;
56 uint8_t dir;
57 uint8_t inited;
58 char dev_name[64];
59 };
60
61 /*
62 * Audio Player module function definitions
63 */
64
65 /*
66 * audio_init - initialize an instance of audio player
67 * @dev_name - the backend sound device used to play / capture
68 * @dir - dir = 1 for write mode, dir = 0 for read mode
69 */
70 struct audio *
audio_init(const char * dev_name,uint8_t dir)71 audio_init(const char *dev_name, uint8_t dir)
72 {
73 struct audio *aud = NULL;
74 #ifndef WITHOUT_CAPSICUM
75 cap_rights_t rights;
76 cap_ioctl_t cmds[] = {
77 SNDCTL_DSP_RESET, SNDCTL_DSP_SETFMT, SNDCTL_DSP_CHANNELS,
78 SNDCTL_DSP_SPEED,
79 #ifdef DEBUG_HDA
80 SNDCTL_DSP_GETOSPACE, SNDCTL_DSP_GETISPACE,
81 #endif
82 };
83 #endif
84
85 assert(dev_name);
86
87 aud = calloc(1, sizeof(*aud));
88 if (!aud)
89 return NULL;
90
91 if (strlen(dev_name) < sizeof(aud->dev_name))
92 memcpy(aud->dev_name, dev_name, strlen(dev_name) + 1);
93 else {
94 DPRINTF("dev_name too big");
95 free(aud);
96 return NULL;
97 }
98
99 aud->dir = dir;
100
101 aud->fd = open(aud->dev_name, aud->dir ? O_WRONLY : O_RDONLY, 0);
102 if (aud->fd == -1) {
103 DPRINTF("Failed to open dev: %s, errno: %d",
104 aud->dev_name, errno);
105 free(aud);
106 return (NULL);
107 }
108
109 #ifndef WITHOUT_CAPSICUM
110 cap_rights_init(&rights, CAP_IOCTL, CAP_READ, CAP_WRITE);
111 if (caph_rights_limit(aud->fd, &rights) == -1)
112 errx(EX_OSERR, "Unable to apply rights for sandbox");
113 if (caph_ioctls_limit(aud->fd, cmds, nitems(cmds)) == -1)
114 errx(EX_OSERR, "Unable to limit ioctl rights for sandbox");
115 #endif
116
117 return aud;
118 }
119
120 /*
121 * audio_set_params - reset the sound device and set the audio params
122 * @aud - the audio player to be configured
123 * @params - the audio parameters to be set
124 */
125 int
audio_set_params(struct audio * aud,struct audio_params * params)126 audio_set_params(struct audio *aud, struct audio_params *params)
127 {
128 int audio_fd;
129 int format, channels, rate;
130 int err;
131 #if DEBUG_HDA == 1
132 audio_buf_info info;
133 #endif
134
135 assert(aud);
136 assert(params);
137
138 if ((audio_fd = aud->fd) < 0) {
139 DPRINTF("Incorrect audio device descriptor for %s",
140 aud->dev_name);
141 return (-1);
142 }
143
144 /* Reset the device if it was previously opened */
145 if (aud->inited) {
146 err = ioctl(audio_fd, SNDCTL_DSP_RESET, NULL);
147 if (err == -1) {
148 DPRINTF("Failed to reset fd: %d, errno: %d",
149 aud->fd, errno);
150 return (-1);
151 }
152 } else
153 aud->inited = 1;
154
155 /* Set the Format (Bits per Sample) */
156 format = params->format;
157 err = ioctl(audio_fd, SNDCTL_DSP_SETFMT, &format);
158 if (err == -1) {
159 DPRINTF("Fail to set fmt: 0x%x errno: %d",
160 params->format, errno);
161 return -1;
162 }
163
164 /* The device does not support the requested audio format */
165 if (format != params->format) {
166 DPRINTF("Mismatch format: 0x%x params->format: 0x%x",
167 format, params->format);
168 return -1;
169 }
170
171 /* Set the Number of Channels */
172 channels = params->channels;
173 err = ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &channels);
174 if (err == -1) {
175 DPRINTF("Fail to set channels: %d errno: %d",
176 params->channels, errno);
177 return -1;
178 }
179
180 /* The device does not support the requested no. of channels */
181 if (channels != params->channels) {
182 DPRINTF("Mismatch channels: %d params->channels: %d",
183 channels, params->channels);
184 return -1;
185 }
186
187 /* Set the Sample Rate / Speed */
188 rate = params->rate;
189 err = ioctl(audio_fd, SNDCTL_DSP_SPEED, &rate);
190 if (err == -1) {
191 DPRINTF("Fail to set speed: %d errno: %d",
192 params->rate, errno);
193 return -1;
194 }
195
196 /* The device does not support the requested rate / speed */
197 if (rate != params->rate) {
198 DPRINTF("Mismatch rate: %d params->rate: %d",
199 rate, params->rate);
200 return -1;
201 }
202
203 #if DEBUG_HDA == 1
204 err = ioctl(audio_fd, aud->dir ? SNDCTL_DSP_GETOSPACE :
205 SNDCTL_DSP_GETISPACE, &info);
206 if (err == -1) {
207 DPRINTF("Fail to get audio buf info errno: %d", errno);
208 return -1;
209 }
210 DPRINTF("fragstotal: 0x%x fragsize: 0x%x",
211 info.fragstotal, info.fragsize);
212 #endif
213 return 0;
214 }
215
216 /*
217 * audio_playback - plays samples to the sound device using blocking operations
218 * @aud - the audio player used to play the samples
219 * @buf - the buffer containing the samples
220 * @count - the number of bytes in buffer
221 */
222 int
audio_playback(struct audio * aud,const uint8_t * buf,size_t count)223 audio_playback(struct audio *aud, const uint8_t *buf, size_t count)
224 {
225 ssize_t len;
226 size_t total;
227 int audio_fd;
228
229 assert(aud);
230 assert(aud->dir);
231 assert(buf);
232
233 audio_fd = aud->fd;
234 assert(audio_fd != -1);
235
236 for (total = 0; total < count; total += len) {
237 len = write(audio_fd, buf + total, count - total);
238 if (len < 0) {
239 DPRINTF("Fail to write to fd: %d, errno: %d",
240 audio_fd, errno);
241 return -1;
242 }
243 }
244
245 return 0;
246 }
247
248 /*
249 * audio_record - records samples from the sound device using
250 * blocking operations.
251 * @aud - the audio player used to capture the samples
252 * @buf - the buffer to receive the samples
253 * @count - the number of bytes to capture in buffer
254 * Returns -1 on error and 0 on success
255 */
256 int
audio_record(struct audio * aud,uint8_t * buf,size_t count)257 audio_record(struct audio *aud, uint8_t *buf, size_t count)
258 {
259 ssize_t len;
260 size_t total;
261 int audio_fd;
262
263 assert(aud);
264 assert(!aud->dir);
265 assert(buf);
266
267 audio_fd = aud->fd;
268 assert(audio_fd != -1);
269
270 for (total = 0; total < count; total += len) {
271 len = read(audio_fd, buf + total, count - total);
272 if (len < 0) {
273 DPRINTF("Fail to write to fd: %d, errno: %d",
274 audio_fd, errno);
275 return -1;
276 }
277 }
278
279 return 0;
280 }
281