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/*
* audio.c - audio interface for reference clock audio drivers
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#if defined(HAVE_SYS_AUDIOIO_H) || defined(HAVE_SUN_AUDIOIO_H)
#include "audio.h"
#include "ntp_stdlib.h"
#include "ntp_syslog.h"
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include <stdio.h>
#include "ntp_string.h"
#ifdef HAVE_SYS_AUDIOIO_H
#include <sys/audioio.h>
#endif /* HAVE_SYS_AUDIOIO_H */
#ifdef HAVE_SUN_AUDIOIO_H
#include <sys/ioccom.h>
#include <sun/audioio.h>
#endif /* HAVE_SUN_AUDIOIO_H */
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif /* HAVE_SYS_IOCTL_H */
#include <fcntl.h>
/*
* Global variables
*/
#ifdef HAVE_SYS_AUDIOIO_H
static struct audio_device device; /* audio device ident */
#endif /* HAVE_SYS_AUDIOIO_H */
static struct audio_info info; /* audio device info */
static int ctl_fd; /* audio control file descriptor */
/*
* audio_init - open and initialize audio device
*
* This code works with SunOS 4.x and Solaris 2.x; however, it is
* believed generic and applicable to other systems with a minor twid
* or two. All it does is open the device, set the buffer size (Solaris
* only), preset the gain and set the input port. It assumes that the
* codec sample rate (8000 Hz), precision (8 bits), number of channels
* (1) and encoding (ITU-T G.711 mu-law companded) have been set by
* default.
*/
int
audio_init(
char *dname /* device name */
)
{
int fd;
int rval;
/*
* Open audio device. Do not complain if not there.
*/
fd = open(dname, O_RDWR | O_NONBLOCK, 0777);
if (fd < 0)
return (fd);
/*
* Open audio control device.
*/
ctl_fd = open("/dev/audioctl", O_RDWR);
if (ctl_fd < 0) {
msyslog(LOG_ERR, "audio: invalid control device\n");
close(fd);
return(ctl_fd);
}
/*
* Set audio device parameters.
*/
rval = audio_gain((AUDIO_MAX_GAIN - AUDIO_MIN_GAIN) / 2,
AUDIO_MICROPHONE);
if (rval < 0) {
msyslog(LOG_ERR, "audio: invalid control device parameters\n");
close(ctl_fd);
close(fd);
return(rval);
}
return (fd);
}
/*
* audio_gain - adjust codec gain and port
*/
int
audio_gain(
int gain, /* gain 0-255 */
int port /* port */
)
{
int rval;
AUDIO_INITINFO(&info);
#ifdef HAVE_SYS_AUDIOIO_H
info.record.buffer_size = AUDIO_BUFSIZ;
#endif /* HAVE_SYS_AUDIOIO_H */
info.record.gain = gain;
info.record.port = port;
info.record.error = 0;
rval = ioctl(ctl_fd, (int)AUDIO_SETINFO, &info);
if (rval < 0) {
msyslog(LOG_ERR, "audio_gain: %m");
return (rval);
}
return (info.record.error);
}
/*
* audio_show - display audio parameters
*
* This code doesn't really do anything, except satisfy curiousity and
* verify the ioctl's work.
*/
void
audio_show(void)
{
#ifdef HAVE_SYS_AUDIOIO_H
ioctl(ctl_fd, (int)AUDIO_GETDEV, &device);
printf("audio: name %s, version %s, config %s\n",
device.name, device.version, device.config);
#endif /* HAVE_SYS_AUDIOIO_H */
ioctl(ctl_fd, (int)AUDIO_GETINFO, &info);
printf(
"audio: samples %d, channels %d, precision %d, encoding %d, gain %d, port %d\n",
info.record.sample_rate, info.record.channels,
info.record.precision, info.record.encoding,
info.record.gain, info.record.port);
printf(
"audio: samples %d, eof %d, pause %d, error %d, waiting %d, balance %d\n",
info.record.samples, info.record.eof,
info.record.pause, info.record.error,
info.record.waiting, info.record.balance);
}
#else
int audio_bs;
#endif /* HAVE_SYS_AUDIOIO_H HAVE_SUN_AUDIOIO_H */
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