1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
65  * audio_init - initialize an instance of audio player
66  * @dev_name - the backend sound device used to play / capture
67  * @dir - dir = 1 for write mode, dir = 0 for read mode
92 	if (nlen < sizeof(aud->dev_name))  in audio_init()
93 		memcpy(aud->dev_name, dev_name, nlen + 1);  in audio_init()
100 	aud->dir = dir;  in audio_init()
102 	aud->fd = open(aud->dev_name, aud->dir ? O_WRONLY : O_RDONLY, 0);  in audio_init()
103 	if (aud->fd == -1) {  in audio_init()
105 		    aud->dev_name, errno);  in audio_init()
112 	if (caph_rights_limit(aud->fd, &rights) == -1)  in audio_init()
114 	if (caph_ioctls_limit(aud->fd, cmds, nitems(cmds)) == -1)  in audio_init()
122  * audio_set_params - reset the sound device and set the audio params
123  * @aud - the audio player to be configured
124  * @params - the audio parameters to be set
130 	int format, channels, rate;  in audio_set_params()  local
139 	if ((audio_fd = aud->fd) < 0) {  in audio_set_params()
141 		    aud->dev_name);  in audio_set_params()
142 		return (-1);  in audio_set_params()
146 	if (aud->inited) {  in audio_set_params()
148 		if (err == -1) {  in audio_set_params()
150 			    aud->fd, errno);  in audio_set_params()
151 			return (-1);  in audio_set_params()
154 		aud->inited = 1;  in audio_set_params()
157 	format = params->format;  in audio_set_params()
159 	if (err == -1) {  in audio_set_params()
161 		    params->format, errno);  in audio_set_params()
162 		return -1;  in audio_set_params()
166 	if (format != params->format) {  in audio_set_params()
167 		DPRINTF("Mismatch format: 0x%x params->format: 0x%x",  in audio_set_params()
168 		    format, params->format);  in audio_set_params()
169 		return -1;  in audio_set_params()
172 	/* Set the Number of Channels */  in audio_set_params()
173 	channels = params->channels;  in audio_set_params()
174 	err = ioctl(audio_fd, SNDCTL_DSP_CHANNELS, &channels);  in audio_set_params()
175 	if (err == -1) {  in audio_set_params()
176 		DPRINTF("Fail to set channels: %d errno: %d",  in audio_set_params()
177 		    params->channels, errno);  in audio_set_params()
178 		return -1;  in audio_set_params()
181 	/* The device does not support the requested no. of channels */  in audio_set_params()
182 	if (channels != params->channels) {  in audio_set_params()
183 		DPRINTF("Mismatch channels: %d params->channels: %d",  in audio_set_params()
184 		    channels, params->channels);  in audio_set_params()
185 		return -1;  in audio_set_params()
189 	rate = params->rate;  in audio_set_params()
191 	if (err == -1) {  in audio_set_params()
193 		    params->rate, errno);  in audio_set_params()
194 		return -1;  in audio_set_params()
198 	if (rate != params->rate) {  in audio_set_params()
199 		DPRINTF("Mismatch rate: %d params->rate: %d",  in audio_set_params()
200 		    rate, params->rate);  in audio_set_params()
201 		return -1;  in audio_set_params()
205 	err = ioctl(audio_fd, aud->dir ? SNDCTL_DSP_GETOSPACE :  in audio_set_params()
207 	if (err == -1) {  in audio_set_params()
209 		return -1;  in audio_set_params()
218  * audio_playback - plays samples to the sound device using blocking operations
219  * @aud - the audio player used to play the samples
220  * @buf - the buffer containing the samples
221  * @count - the number of bytes in buffer
231 	assert(aud->dir);  in audio_playback()
234 	audio_fd = aud->fd;  in audio_playback()
235 	assert(audio_fd != -1);  in audio_playback()
238 		len = write(audio_fd, buf + total, count - total);  in audio_playback()
242 			return -1;  in audio_playback()
250  * audio_record - records samples from the sound device using
252  * @aud - the audio player used to capture the samples
253  * @buf - the buffer to receive the samples
254  * @count - the number of bytes to capture in buffer
255  * Returns -1 on error and 0 on success
265 	assert(!aud->dir);  in audio_record()
268 	audio_fd = aud->fd;  in audio_record()
269 	assert(audio_fd != -1);  in audio_record()
272 		len = read(audio_fd, buf + total, count - total);  in audio_record()
276 			return -1;  in audio_record()