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Implement support for dB gain display in alsamixer.

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This commit is contained in:
James Courtier-Dutton 2006-07-22 14:56:48 +01:00
parent 91273c228f
commit 5e3fc87888
3 changed files with 139 additions and 5 deletions
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35
src/mixer/simple_none.c
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@ -971,12 +971,37 @@ static int get_volume_ops(snd_mixer_elem_t *elem, int dir,
return 0;
}
static int get_dB_ops(snd_mixer_elem_t *elem ATTRIBUTE_UNUSED,
int dir ATTRIBUTE_UNUSED,
snd_mixer_selem_channel_id_t channel ATTRIBUTE_UNUSED,
long *value ATTRIBUTE_UNUSED)
static int get_dB_ops(snd_mixer_elem_t *elem,
int dir,
snd_mixer_selem_channel_id_t channel,
long *value)
{
return -ENXIO;
selem_none_t *s = snd_mixer_elem_get_private(elem);
selem_ctl_t *c;
int err = -EINVAL;
long volume, db_gain;
if (dir == SM_PLAY) {
c = &s->ctls[CTL_PLAYBACK_VOLUME];
if (c->type != 2) {
goto _err;
}
} else if (dir == SM_CAPT) {
c = &s->ctls[CTL_CAPTURE_VOLUME];
if (c->type != 2) {
goto _err;
}
} else goto _err;
if (err = get_volume_ops(elem, dir, channel, &volume)) {
goto _err;
}
if ((err = snd_hctl_elem_get_db_gain(c->elem, volume, &db_gain)) < 0) {
goto _err;
}
err = 0;
*value = db_gain;
_err:
//if (err) printf("get_dB_ops:err=%d\n",err);
return err;
}
static int get_switch_ops(snd_mixer_elem_t *elem, int dir,