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alsa: try to figure out if a device can handle volume by asking for its 

range

there are some buggy devices that are just return false for the has
function but actually have a min and max on those devices,so we use that
to check if its sink/source capable.
This commit is contained in:
Marcel Hollerbach 2017-02-04 23:00:23 +01:00
parent 55a7d4feed
commit 95b4f4b180
1 changed files with 17 additions and 4 deletions
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21
src/modules/mixer/lib/backends/alsa/alsa.c
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@ -304,15 +304,28 @@ _alsa_cards_refresh(void)
elem = snd_mixer_first_elem(mixer);
for (; elem; elem = snd_mixer_elem_next(elem))
{
long min = 0, max = 0;
if (strncmp(snd_mixer_selem_get_name(elem),
"Master", sizeof("Master") - 1))
continue;
//check if its a source or a sink
if (snd_mixer_selem_has_capture_volume(elem))
tmp_source = eina_list_append(tmp_source, elem);
else if (snd_mixer_selem_has_playback_volume(elem))
tmp_sink = eina_list_append(tmp_sink, elem);
snd_mixer_selem_get_capture_volume_range(elem, &min, &max);
DBG("Mixer element %p of dev %d has range %ld %ld", elem, card_num, min, max);
if (min < max)
{
tmp_source = eina_list_append(tmp_source, elem);
continue;
}
min = max = 0;
snd_mixer_selem_get_playback_volume_range(elem, &min, &max);
DBG("Mixer element %p of dev %d has range %ld %ld", elem, card_num, min, max);
if (min < max)
{
tmp_sink = eina_list_append(tmp_sink, elem);
continue;
}
}
device_name = _alsa_cards_name_get(buf);