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alsa-mixer: allow to re-attach the mixer control element

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It may be possible that the ALSA control element appears
again. Allow this combination by checking, if the pulseaudio
mixer element already exists. Do not create the duplicate
mixer element in this case.
This commit is contained in:
Wim Taymans 2023-03-20 13:19:51 +01:00
parent 282c7975fa
commit b554fc20e9
1 changed files with 12 additions and 4 deletions
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16
spa/plugins/alsa/acp/alsa-util.c
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@ -1648,12 +1648,20 @@ static int mixer_class_event(snd_mixer_class_t *class, unsigned int mask,
} else if (mask & SND_CTL_EVENT_MASK_ADD) {
snd_ctl_elem_iface_t iface = snd_hctl_elem_get_interface(helem);
if (iface == SND_CTL_ELEM_IFACE_CARD || iface == SND_CTL_ELEM_IFACE_PCM) {
snd_mixer_t *mixer = snd_mixer_class_get_mixer(class);
snd_ctl_elem_iface_t iface = snd_hctl_elem_get_interface(helem);
const char *name = snd_hctl_elem_get_name(helem);
const int index = snd_hctl_elem_get_index(helem);
const int device = snd_hctl_elem_get_device(helem);
snd_mixer_elem_t *new_melem;
/* Put the hctl pointer as our private data - it will be useful for callbacks */
if ((err = snd_mixer_elem_new(&new_melem, SND_MIXER_ELEM_PULSEAUDIO, 0, helem, NULL)) < 0) {
pa_log_warn("snd_mixer_elem_new failed: %s", pa_alsa_strerror(err));
return 0;
new_melem = pa_alsa_mixer_find(mixer, iface, name, index, device);
if (!new_melem) {
/* Put the hctl pointer as our private data - it will be useful for callbacks */
if ((err = snd_mixer_elem_new(&new_melem, SND_MIXER_ELEM_PULSEAUDIO, 0, helem, NULL)) < 0) {
pa_log_warn("snd_mixer_elem_new failed: %s", pa_alsa_strerror(err));
return 0;
}
}
if ((err = snd_mixer_elem_attach(new_melem, helem)) < 0) {