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Report volume like alsamixer. Maybe.

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I have no idea how they calculate dB.
This commit is contained in:
Lars Immisch
2017-11-07 00:57:02 +01:00
parent ce84e69cc1
commit 917a11b398
1 changed files with 22 additions and 18 deletions
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40
alsaaudio.c
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@@ -1585,6 +1585,18 @@ static double alsamixer_getpercentage(long min, long max, long value)
return (double)value/(double)range * 100.0;
}
static double alsamixer_getdB(long min, long max, long value)
{
/* Convert from number in range to dB */
int range = max - min;
if (range == 0)
return 0;
value -= min;
return log10((double)value/range) * 60.0;
}
static long alsamixer_getphysvolume(long min, long max, double percentage)
{
/* Convert from percentage to number in range */
@@ -1639,21 +1651,14 @@ alsamixer_getvolume(alsamixer_t *self, PyObject *args, PyObject *kw)
if (dir == SND_PCM_STREAM_PLAYBACK &&
snd_mixer_selem_has_playback_channel(elem, channel))
{
if (unit == unit_percent) {
snd_mixer_selem_get_playback_volume(elem, channel, &ival);
item = PyFloat_FromDouble(alsamixer_getpercentage(self->pmin,
self->pmax,
ival));
if (unit == unit_percent) {
item = PyFloat_FromDouble(
alsamixer_getpercentage(self->pmin, self->pmax, ival));
}
else {
int rc = snd_mixer_selem_get_playback_dB(elem, channel, &ival);
if (rc < 0) {
PyErr_Format(ALSAAudioError,
"snd_mixer_selem_get_playback_dB failed: %d",
rc);
return NULL;
}
item = PyFloat_FromDouble(ival / 100.0);
item = PyFloat_FromDouble(
alsamixer_getdB(self->pmin, self->pmax, ival));
}
PyList_Append(result, item);
Py_DECREF(item);
@@ -1662,15 +1667,14 @@ alsamixer_getvolume(alsamixer_t *self, PyObject *args, PyObject *kw)
&& snd_mixer_selem_has_capture_channel(elem, channel)
&& snd_mixer_selem_has_capture_volume(elem))
{
if (unit == unit_percent) {
snd_mixer_selem_get_capture_volume(elem, channel, &ival);
item = PyFloat_FromDouble(alsamixer_getpercentage(self->cmin,
self->cmax,
ival));
if (unit == unit_percent) {
item = PyFloat_FromDouble(
alsamixer_getpercentage(self->cmin, self->cmax, ival));
}
else {
snd_mixer_selem_get_capture_dB(elem, channel, &ival);
item = PyFloat_FromDouble(ival / 100.0);
item = PyFloat_FromDouble(
alsamixer_getdB(self->cmin, self->cmax, ival));
}
PyList_Append(result, item);
Py_DECREF(item);