components/volume.c
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/* See LICENSE file for copyright and license details. */
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include "../util.h"
#if defined(__OpenBSD__)
#include <sys/audioio.h>
const char *
vol_perc(const char *card)
{
static int cls = -1;
mixer_devinfo_t mdi;
mixer_ctrl_t mc;
int afd = -1, m = -1, v = -1;
if ((afd = open(card, O_RDONLY)) < 0) {
warn("open '%s':", card);
return NULL;
}
for (mdi.index = 0; cls == -1; mdi.index++) {
if (ioctl(afd, AUDIO_MIXER_DEVINFO, &mdi) < 0) {
warn("ioctl 'AUDIO_MIXER_DEVINFO':");
close(afd);
return NULL;
}
if (mdi.type == AUDIO_MIXER_CLASS &&
!strncmp(mdi.label.name,
AudioCoutputs,
MAX_AUDIO_DEV_LEN))
cls = mdi.index;
}
for (mdi.index = 0; v == -1 || m == -1; mdi.index++) {
if (ioctl(afd, AUDIO_MIXER_DEVINFO, &mdi) < 0) {
warn("ioctl 'AUDIO_MIXER_DEVINFO':");
close(afd);
return NULL;
}
if (mdi.mixer_class == cls &&
((mdi.type == AUDIO_MIXER_VALUE &&
!strncmp(mdi.label.name,
AudioNmaster,
MAX_AUDIO_DEV_LEN)) ||
(mdi.type == AUDIO_MIXER_ENUM &&
!strncmp(mdi.label.name,
AudioNmute,
MAX_AUDIO_DEV_LEN)))) {
mc.dev = mdi.index, mc.type = mdi.type;
if (ioctl(afd, AUDIO_MIXER_READ, &mc) < 0) {
warn("ioctl 'AUDIO_MIXER_READ':");
close(afd);
return NULL;
}
if (mc.type == AUDIO_MIXER_VALUE)
v = mc.un.value.num_channels == 1 ?
mc.un.value.level[AUDIO_MIXER_LEVEL_MONO] :
(mc.un.value.level[AUDIO_MIXER_LEVEL_LEFT] >
mc.un.value.level[AUDIO_MIXER_LEVEL_RIGHT] ?
mc.un.value.level[AUDIO_MIXER_LEVEL_LEFT] :
mc.un.value.level[AUDIO_MIXER_LEVEL_RIGHT]);
else if (mc.type == AUDIO_MIXER_ENUM)
m = mc.un.ord;
}
}
close(afd);
return bprintf("%d", m ? 0 : v * 100 / 255);
}
#else
#include <sys/soundcard.h>
const char *
vol_perc(const char *card)
{
size_t i;
int v, afd, devmask;
char *vnames[] = SOUND_DEVICE_NAMES;
if ((afd = open(card, O_RDONLY | O_NONBLOCK)) < 0) {
warn("open '%s':", card);
return NULL;
}
if (ioctl(afd, (int)SOUND_MIXER_READ_DEVMASK, &devmask) < 0) {
warn("ioctl 'SOUND_MIXER_READ_DEVMASK':");
close(afd);
return NULL;
}
for (i = 0; i < LEN(vnames); i++) {
if (devmask & (1 << i) && !strcmp("vol", vnames[i])) {
if (ioctl(afd, MIXER_READ(i), &v) < 0) {
warn("ioctl 'MIXER_READ(%ld)':", i);
close(afd);
return NULL;
}
}
}
close(afd);
return bprintf("%d", v & 0xff);
}
#endif