alsa: include mixer name in sink/source properties

src/modules/alsa/alsa-sink.c

@@ -1508,6 +1508,7 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     size_t frame_size;
     pa_bool_t use_mmap = TRUE, b, use_tsched = TRUE, d, ignore_dB = FALSE;
     pa_sink_new_data data;
+    char *control_device = NULL;
 
     pa_assert(m);
     pa_assert(ma);
@@ -1664,7 +1665,7 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     /* ALSA might tweak the sample spec, so recalculate the frame size */
     frame_size = pa_frame_size(&ss);
 
-    pa_alsa_find_mixer_and_elem(u->pcm_handle, &u->mixer_handle, &u->mixer_elem, pa_modargs_get_value(ma, "control", NULL), profile);
+    pa_alsa_find_mixer_and_elem(u->pcm_handle, &control_device, &u->mixer_handle, &u->mixer_elem, pa_modargs_get_value(ma, "control", NULL), profile);
 
     pa_sink_new_data_init(&data);
     data.driver = driver;
@@ -1687,6 +1688,11 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
 
     pa_alsa_init_description(data.proplist);
 
+    if (control_device) {
+        pa_alsa_init_proplist_ctl(data.proplist, control_device);
+        pa_xfree(control_device);
+    }
+
     u->sink = pa_sink_new(m->core, &data, PA_SINK_HARDWARE|PA_SINK_LATENCY|(u->use_tsched ? PA_SINK_DYNAMIC_LATENCY : 0));
     pa_sink_new_data_done(&data);
 

src/modules/alsa/alsa-source.c

@@ -1366,6 +1366,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
     size_t frame_size;
     pa_bool_t use_mmap = TRUE, b, use_tsched = TRUE, d, ignore_dB = FALSE;
     pa_source_new_data data;
+    char *control_device = NULL;
 
     pa_assert(m);
     pa_assert(ma);
@@ -1519,7 +1520,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
     /* ALSA might tweak the sample spec, so recalculate the frame size */
     frame_size = pa_frame_size(&ss);
 
-    pa_alsa_find_mixer_and_elem(u->pcm_handle, &u->mixer_handle, &u->mixer_elem, pa_modargs_get_value(ma, "control", NULL), profile);
+    pa_alsa_find_mixer_and_elem(u->pcm_handle, &control_device, &u->mixer_handle, &u->mixer_elem, pa_modargs_get_value(ma, "control", NULL), profile);
 
     pa_source_new_data_init(&data);
     data.driver = driver;
@@ -1542,6 +1543,11 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
 
     pa_alsa_init_description(data.proplist);
 
+    if (control_device) {
+        pa_alsa_init_proplist_ctl(data.proplist, control_device);
+        pa_xfree(control_device);
+    }
+
     u->source = pa_source_new(m->core, &data, PA_SOURCE_HARDWARE|PA_SOURCE_LATENCY|(u->use_tsched ? PA_SOURCE_DYNAMIC_LATENCY : 0));
     pa_source_new_data_done(&data);
 

src/modules/alsa/alsa-util.c

@@ -189,15 +189,6 @@ struct pa_alsa_fdlist *pa_alsa_fdlist_new(void) {
 
     fdl = pa_xnew0(struct pa_alsa_fdlist, 1);
 
-    fdl->num_fds = 0;
-    fdl->fds = NULL;
-    fdl->work_fds = NULL;
-    fdl->mixer = NULL;
-    fdl->m = NULL;
-    fdl->defer = NULL;
-    fdl->ios = NULL;
-    fdl->polled = FALSE;
-
     return fdl;
 }
 
@@ -1176,6 +1167,7 @@ success:
 
 int pa_alsa_find_mixer_and_elem(
         snd_pcm_t *pcm,
+        char **ctl_device,
         snd_mixer_t **_m,
         snd_mixer_elem_t **_e,
         const char *control_name,
@@ -1203,9 +1195,13 @@ int pa_alsa_find_mixer_and_elem(
 
     /* First, try by name */
     if ((dev = snd_pcm_name(pcm)))
-        if (pa_alsa_prepare_mixer(m, dev) >= 0)
+        if (pa_alsa_prepare_mixer(m, dev) >= 0) {
             found = TRUE;
 
+            if (ctl_device)
+                *ctl_device = pa_xstrdup(dev);
+        }
+
     /* Then, try by card index */
     if (!found) {
         snd_pcm_info_t* info;
@@ -1220,9 +1216,15 @@ int pa_alsa_find_mixer_and_elem(
                 md = pa_sprintf_malloc("hw:%i", card_idx);
 
                 if (!dev || !pa_streq(dev, md))
-                    if (pa_alsa_prepare_mixer(m, md) >= 0)
+                    if (pa_alsa_prepare_mixer(m, md) >= 0) {
                         found = TRUE;
 
+                        if (ctl_device) {
+                            *ctl_device = md;
+                            md = NULL;
+                        }
+                    }
+
                 pa_xfree(md);
             }
         }
@@ -1258,6 +1260,9 @@ int pa_alsa_find_mixer_and_elem(
     }
 
     if (!e) {
+        if (ctl_device)
+            pa_xfree(*ctl_device);
+
         snd_mixer_close(m);
         return -1;
     }
@@ -1601,6 +1606,36 @@ void pa_alsa_init_proplist_pcm(pa_core *c, pa_proplist *p, snd_pcm_t *pcm, snd_m
         pa_alsa_init_proplist_pcm_info(c, p, info);
 }
 
+void pa_alsa_init_proplist_ctl(pa_proplist *p, const char *name) {
+    int err;
+    snd_ctl_t *ctl;
+    snd_ctl_card_info_t *info;
+    const char *t;
+
+    pa_assert(p);
+
+    snd_ctl_card_info_alloca(&info);
+
+    if ((err = snd_ctl_open(&ctl, name, 0)) < 0) {
+        pa_log_warn("Error opening low-level control device '%s'", name);
+        return;
+    }
+
+    if ((err = snd_ctl_card_info(ctl, info)) < 0) {
+        pa_log_warn("Control device %s card info: %s", name, snd_strerror(err));
+        snd_ctl_close(ctl);
+        return;
+    }
+
+    if ((t = snd_ctl_card_info_get_mixername(info)))
+        pa_proplist_sets(p, "alsa.mixer_name", t);
+
+    if ((t = snd_ctl_card_info_get_components(info)))
+        pa_proplist_sets(p, "alsa.components", t);
+
+    snd_ctl_close(ctl);
+}
+
 int pa_alsa_recover_from_poll(snd_pcm_t *pcm, int revents) {
     snd_pcm_state_t state;
     int err;

src/modules/alsa/alsa-util.h

@@ -66,7 +66,9 @@ typedef struct pa_alsa_profile_info {
 
 int pa_alsa_prepare_mixer(snd_mixer_t *mixer, const char *dev);
 snd_mixer_elem_t *pa_alsa_find_elem(snd_mixer_t *mixer, const char *name, const char *fallback, pa_bool_t playback);
-int pa_alsa_find_mixer_and_elem(snd_pcm_t *pcm, snd_mixer_t **_m, snd_mixer_elem_t **_e, const char *control_name, const pa_alsa_profile_info*profile);
+int pa_alsa_find_mixer_and_elem(snd_pcm_t *pcm, char **ctl_device, snd_mixer_t **_m, snd_mixer_elem_t **_e, const char *control_name, const pa_alsa_profile_info*profile);
+
+void pa_alsa_init_proplist_ctl(pa_proplist *p, const char *name);
 
 /* Picks a working profile based on the specified ss/map */
 snd_pcm_t *pa_alsa_open_by_device_id_auto(