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