introduce default channel map in addition to the default sample spec

src/modules/alsa/alsa-sink.c

@@ -1378,6 +1378,7 @@ pa_sink *pa_alsa_sink_new(pa_module *m, pa_modargs *ma, const char*driver, pa_ca
     pa_assert(ma);
 
     ss = m->core->default_sample_spec;
+    map = m->core->default_channel_map;
     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_ALSA) < 0) {
         pa_log("Failed to parse sample specification and channel map");
         goto fail;

src/modules/alsa/alsa-source.c

@@ -1229,6 +1229,7 @@ pa_source *pa_alsa_source_new(pa_module *m, pa_modargs *ma, const char*driver, p
     pa_assert(ma);
 
     ss = m->core->default_sample_spec;
+    map = m->core->default_channel_map;
     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_ALSA) < 0) {
         pa_log("Failed to parse sample specification");
         goto fail;

src/modules/module-combine.c

@@ -1052,8 +1052,9 @@ int pa__init(pa_module*m) {
 
     slaves = pa_modargs_get_value(ma, "slaves", NULL);
     u->automatic = !slaves;
-    ss = m->core->default_sample_spec;
 
+    ss = m->core->default_sample_spec;
+    map = m->core->default_channel_map;
     if ((pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0)) {
         pa_log("Invalid sample specification.");
         goto fail;

src/modules/module-jack-sink.c

@@ -329,12 +329,18 @@ int pa__init(pa_module*m) {
     if (!channels)
         channels = m->core->default_sample_spec.channels;
 
-    if (pa_modargs_get_value_u32(ma, "channels", &channels) < 0 || channels <= 0 || channels >= PA_CHANNELS_MAX) {
+    if (pa_modargs_get_value_u32(ma, "channels", &channels) < 0 ||
+        channels <= 0 ||
+        channels > PA_CHANNELS_MAX) {
         pa_log("Failed to parse channels= argument.");
         goto fail;
     }
 
-    pa_channel_map_init_extend(&map, channels, PA_CHANNEL_MAP_ALSA);
+    if (channels == m->core->default_channel_map.channels)
+        map = m->core->default_channel_map;
+    else
+        pa_channel_map_init_extend(&map, channels, PA_CHANNEL_MAP_ALSA);
+
     if (pa_modargs_get_channel_map(ma, NULL, &map) < 0 || map.channels != channels) {
         pa_log("Failed to parse channel_map= argument.");
         goto fail;

src/modules/module-jack-source.c

@@ -296,12 +296,18 @@ int pa__init(pa_module*m) {
     if (!channels)
         channels = m->core->default_sample_spec.channels;
 
-    if (pa_modargs_get_value_u32(ma, "channels", &channels) < 0 || channels <= 0 || channels >= PA_CHANNELS_MAX) {
+    if (pa_modargs_get_value_u32(ma, "channels", &channels) < 0 ||
+        channels <= 0 ||
+        channels >= PA_CHANNELS_MAX) {
         pa_log("failed to parse channels= argument.");
         goto fail;
     }
 
-    pa_channel_map_init_extend(&map, channels, PA_CHANNEL_MAP_ALSA);
+    if (channels == m->core->default_channel_map.channels)
+        map = m->core->default_channel_map;
+    else
+        pa_channel_map_init_extend(&map, channels, PA_CHANNEL_MAP_ALSA);
+
     if (pa_modargs_get_channel_map(ma, NULL, &map) < 0 || map.channels != channels) {
         pa_log("failed to parse channel_map= argument.");
         goto fail;

src/modules/module-null-sink.c

@@ -262,6 +262,7 @@ int pa__init(pa_module*m) {
     }
 
     ss = m->core->default_sample_spec;
+    map = m->core->default_channel_map;
     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
         pa_log("Invalid sample format specification or channel map");
         goto fail;

src/modules/module-pipe-sink.c

@@ -234,6 +234,7 @@ int pa__init(pa_module*m) {
     }
 
     ss = m->core->default_sample_spec;
+    map = m->core->default_channel_map;
     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
         pa_log("Invalid sample format specification or channel map");
         goto fail;

src/modules/module-pipe-source.c

@@ -221,6 +221,7 @@ int pa__init(pa_module*m) {
     }
 
     ss = m->core->default_sample_spec;
+    map = m->core->default_channel_map;
     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
         pa_log("invalid sample format specification or channel map");
         goto fail;

src/modules/module-tunnel.c

@@ -1717,6 +1717,7 @@ int pa__init(pa_module*m) {
     }
 
     ss = m->core->default_sample_spec;
+    map = m->core->default_channel_map;
     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_DEFAULT) < 0) {
         pa_log("Invalid sample format specification");
         goto fail;

src/modules/module-zeroconf-discover.c

@@ -162,7 +162,7 @@ static void resolver_cb(
         pa_module *m;
 
         ss = u->core->default_sample_spec;
-        pa_channel_map_init_extend(&cm, ss.channels, PA_CHANNEL_MAP_DEFAULT);
+        cm = u->core->default_channel_map;
 
         for (l = txt; l; l = l->next) {
             char *key, *value;

src/modules/oss/module-oss.c

@@ -1185,6 +1185,7 @@ int pa__init(pa_module*m) {
     mode = (playback && record) ? O_RDWR : (playback ? O_WRONLY : (record ? O_RDONLY : 0));
 
     ss = m->core->default_sample_spec;
+    map = m->core->default_channel_map;
     if (pa_modargs_get_sample_spec_and_channel_map(ma, &ss, &map, PA_CHANNEL_MAP_OSS) < 0) {
         pa_log("Failed to parse sample specification or channel map");
         goto fail;