File 0031-alsa-mixer-improve-check-for-the-empty-path-set-for-.patch of Package pulseaudio

From d7dbd0cbe3191661c02ac89d108b36c79474de3c Mon Sep 17 00:00:00 2001
From: Jaroslav Kysela <perex@perex.cz>
Date: Sun, 8 Dec 2019 23:17:32 +0100
Subject: [PATCH] alsa-mixer: improve check for the empty path set for
 sink/source

The unused mixer instances are created without this code.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---
 src/modules/alsa/alsa-mixer.c  |  6 ++++++
 src/modules/alsa/alsa-mixer.h  |  1 +
 src/modules/alsa/alsa-sink.c   | 19 +++++++++++++------
 src/modules/alsa/alsa-source.c |  9 ++++++---
 4 files changed, 26 insertions(+), 9 deletions(-)

diff --git a/src/modules/alsa/alsa-mixer.c b/src/modules/alsa/alsa-mixer.c
index a3c998b654e9..d184aec7aee7 100644
--- a/src/modules/alsa/alsa-mixer.c
+++ b/src/modules/alsa/alsa-mixer.c
@@ -741,6 +741,12 @@ void pa_alsa_path_set_free(pa_alsa_path_set *ps) {
     pa_xfree(ps);
 }
 
+int pa_alsa_path_set_is_empty(pa_alsa_path_set *ps) {
+    if (ps && !pa_hashmap_isempty(ps->paths))
+        return 0;
+    return 1;
+}
+
 static long to_alsa_dB(pa_volume_t v) {
     return lround(pa_sw_volume_to_dB(v) * 100.0);
 }
diff --git a/src/modules/alsa/alsa-mixer.h b/src/modules/alsa/alsa-mixer.h
index d740a78c8dce..df739cc2e0f3 100644
--- a/src/modules/alsa/alsa-mixer.h
+++ b/src/modules/alsa/alsa-mixer.h
@@ -272,6 +272,7 @@ pa_alsa_path_set *pa_alsa_path_set_new(pa_alsa_mapping *m, pa_alsa_direction_t d
 void pa_alsa_path_set_dump(pa_alsa_path_set *s);
 void pa_alsa_path_set_set_callback(pa_alsa_path_set *ps, snd_mixer_t *m, snd_mixer_elem_callback_t cb, void *userdata);
 void pa_alsa_path_set_free(pa_alsa_path_set *s);
+int pa_alsa_path_set_is_empty(pa_alsa_path_set *s);
 
 struct pa_alsa_mapping {
     pa_alsa_profile_set *profile_set;
diff --git a/src/modules/alsa/alsa-sink.c b/src/modules/alsa/alsa-sink.c
index 363b4be2fa25..042d4dfd9c89 100644
--- a/src/modules/alsa/alsa-sink.c
+++ b/src/modules/alsa/alsa-sink.c
@@ -1651,7 +1651,6 @@ static int sink_set_port_ucm_cb(pa_sink *s, pa_device_port *p) {
 
     pa_assert(u);
     pa_assert(p);
-    pa_assert(u->mixer_handle);
     pa_assert(u->ucm_context);
 
     data = PA_DEVICE_PORT_DATA(p);
@@ -2089,6 +2088,9 @@ static void find_mixer(struct userdata *u, pa_alsa_mapping *mapping, const char
     if (!mapping && !element)
         return;
 
+    if (!element && mapping && pa_alsa_path_set_is_empty(mapping->output_path_set))
+        return;
+
     u->mixers = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func,
                                     NULL, (pa_free_cb_t) pa_alsa_mixer_free);
 
@@ -2113,8 +2115,9 @@ static void find_mixer(struct userdata *u, pa_alsa_mapping *mapping, const char
 
         pa_log_debug("Probed mixer path %s:", u->mixer_path->name);
         pa_alsa_path_dump(u->mixer_path);
-    } else if (!(u->mixer_path_set = mapping->output_path_set))
-        goto fail;
+    } else {
+        u->mixer_path_set = mapping->output_path_set;
+    }
 
     return;
 
@@ -2559,10 +2562,14 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
         goto fail;
     }
 
-    if (u->ucm_context)
+    if (u->ucm_context) {
         pa_alsa_ucm_add_ports(&data.ports, data.proplist, u->ucm_context, true, card, u->pcm_handle, ignore_dB);
-    else if (u->mixer_path_set)
-        pa_alsa_add_ports(&data, u->mixer_path_set, card);
+        find_mixer(u, mapping, pa_modargs_get_value(ma, "control", NULL), ignore_dB);
+    } else {
+        find_mixer(u, mapping, pa_modargs_get_value(ma, "control", NULL), ignore_dB);
+        if (u->mixer_path_set)
+            pa_alsa_add_ports(&data, u->mixer_path_set, card);
+    }
 
     u->sink = pa_sink_new(m->core, &data, PA_SINK_HARDWARE | PA_SINK_LATENCY | (u->use_tsched ? PA_SINK_DYNAMIC_LATENCY : 0) |
                           (set_formats ? PA_SINK_SET_FORMATS : 0));
diff --git a/src/modules/alsa/alsa-source.c b/src/modules/alsa/alsa-source.c
index b46e845cc5a7..104de4e266dd 100644
--- a/src/modules/alsa/alsa-source.c
+++ b/src/modules/alsa/alsa-source.c
@@ -1522,7 +1522,6 @@ static int source_set_port_ucm_cb(pa_source *s, pa_device_port *p) {
 
     pa_assert(u);
     pa_assert(p);
-    pa_assert(u->mixer_handle);
     pa_assert(u->ucm_context);
 
     data = PA_DEVICE_PORT_DATA(p);
@@ -1795,6 +1794,9 @@ static void find_mixer(struct userdata *u, pa_alsa_mapping *mapping, const char
     if (!mapping && !element)
         return;
 
+    if (!element && mapping && pa_alsa_path_set_is_empty(mapping->input_path_set))
+        return;
+
     u->mixers = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func,
                                     NULL, (pa_free_cb_t) pa_alsa_mixer_free);
 
@@ -1819,8 +1821,9 @@ static void find_mixer(struct userdata *u, pa_alsa_mapping *mapping, const char
 
         pa_log_debug("Probed mixer path %s:", u->mixer_path->name);
         pa_alsa_path_dump(u->mixer_path);
-    } else if (!(u->mixer_path_set = mapping->input_path_set))
-        goto fail;
+    } else {
+        u->mixer_path_set = mapping->input_path_set;
+    }
 
     return;
 
-- 
2.16.4