alsa-ucm: use the proper mixer name for ucm pcm sink/source

Signed-off-by: Jaroslav Kysela <perex@perex.cz>

src/modules/alsa/alsa-sink.c

@@ -2083,11 +2083,18 @@ static void set_sink_name(pa_sink_new_data *data, pa_modargs *ma, const char *de
 }
 
 static void find_mixer(struct userdata *u, pa_alsa_mapping *mapping, const char *element, bool ignore_dB) {
+    const char *mdev;
 
     if (!mapping && !element)
         return;
 
-    if (!(u->mixer_handle = pa_alsa_open_mixer_for_pcm(u->pcm_handle, &u->control_device))) {
+    mdev = pa_proplist_gets(mapping->proplist, "alsa.mixer_device");
+    if (mdev) {
+        u->mixer_handle = pa_alsa_open_mixer_by_name(mdev);
+    } else {
+        u->mixer_handle = pa_alsa_open_mixer_for_pcm(u->pcm_handle, &u->control_device);
+    }
+    if (!mdev) {
         pa_log_info("Failed to find a working mixer device.");
         return;
     }

src/modules/alsa/alsa-source.c

@@ -1789,10 +1789,18 @@ static void set_source_name(pa_source_new_data *data, pa_modargs *ma, const char
 }
 
 static void find_mixer(struct userdata *u, pa_alsa_mapping *mapping, const char *element, bool ignore_dB) {
+    const char *mdev;
+
     if (!mapping && !element)
         return;
 
-    if (!(u->mixer_handle = pa_alsa_open_mixer_for_pcm(u->pcm_handle, &u->control_device))) {
+    mdev = pa_proplist_gets(mapping->proplist, "alsa.mixer_device");
+    if (mdev) {
+        u->mixer_handle = pa_alsa_open_mixer_by_name(mdev);
+    } else {
+        u->mixer_handle = pa_alsa_open_mixer_for_pcm(u->pcm_handle, &u->control_device);
+    }
+    if (!mdev) {
         pa_log_info("Failed to find a working mixer device.");
         return;
     }

src/modules/alsa/alsa-ucm.c

@@ -1339,7 +1339,8 @@ static void ucm_add_mapping(pa_alsa_profile *p, pa_alsa_mapping *m) {
 
 static void alsa_mapping_add_ucm_device(pa_alsa_mapping *m, pa_alsa_ucm_device *device) {
     char *cur_desc;
-    const char *new_desc;
+    const char *new_desc, *mdev;
+    bool is_sink = m->direction == PA_ALSA_DIRECTION_OUTPUT;
 
     pa_idxset_put(m->ucm_context.ucm_devices, device, NULL);
 
@@ -1355,10 +1356,14 @@ static void alsa_mapping_add_ucm_device(pa_alsa_mapping *m, pa_alsa_ucm_device *
     m->description = m->description ? m->description : pa_xstrdup("");
 
     /* save mapping to ucm device */
-    if (m->direction == PA_ALSA_DIRECTION_OUTPUT)
+    if (is_sink)
         device->playback_mapping = m;
     else
         device->capture_mapping = m;
+
+    mdev = get_mixer_device(device, is_sink);
+    if (mdev)
+        pa_proplist_sets(m->proplist, "alsa.mixer_device", mdev);
 }
 
 static void alsa_mapping_add_ucm_modifier(pa_alsa_mapping *m, pa_alsa_ucm_modifier *modifier) {