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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.

Link: def8eb074e
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2023-03-20 13:19:51 +01:00 • committed by Wim Taymans
parent 2c3e8d90d3
commit 3177f41cb4
1 changed files with 12 additions and 4 deletions
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16
spa/plugins/alsa/acp/alsa-util.c
View file

@ -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) {