introduce default channel map in addition to the default sample spec

src/pulsecore/cli-command.c

@@ -321,6 +321,8 @@ static int pa_cli_command_source_outputs(pa_core *c, pa_tokenizer *t, pa_strbuf
 }
 
 static int pa_cli_command_stat(pa_core *c, pa_tokenizer *t, pa_strbuf *buf, pa_bool_t *fail) {
+    char ss[PA_SAMPLE_SPEC_SNPRINT_MAX];
+    char cm[PA_CHANNEL_MAP_SNPRINT_MAX];
     char s[256];
     const pa_mempool_stat *stat;
     unsigned k;
@@ -363,7 +365,10 @@ static int pa_cli_command_stat(pa_core *c, pa_tokenizer *t, pa_strbuf *buf, pa_b
                      pa_bytes_snprint(s, sizeof(s), (unsigned) pa_scache_total_size(c)));
 
     pa_strbuf_printf(buf, "Default sample spec: %s\n",
-                     pa_sample_spec_snprint(s, sizeof(s), &c->default_sample_spec));
+                     pa_sample_spec_snprint(ss, sizeof(ss), &c->default_sample_spec));
+
+    pa_strbuf_printf(buf, "Default channel map: %s\n",
+                     pa_channel_map_snprint(cm, sizeof(cm), &c->default_channel_map));
 
     def_sink = pa_namereg_get_default_sink(c);
     def_source = pa_namereg_get_default_source(c);

src/pulsecore/core.c

@@ -111,6 +111,7 @@ pa_core* pa_core_new(pa_mainloop_api *m, pa_bool_t shared, size_t shm_size) {
     c->default_sample_spec.format = PA_SAMPLE_S16NE;
     c->default_sample_spec.rate = 44100;
     c->default_sample_spec.channels = 2;
+    pa_channel_map_init_extend(&c->default_channel_map, c->default_sample_spec.channels, PA_CHANNEL_MAP_DEFAULT);
     c->default_n_fragments = 4;
     c->default_fragment_size_msec = 25;
 

src/pulsecore/core.h

@@ -122,6 +122,7 @@ struct pa_core {
     pa_source *default_source;
     pa_sink *default_sink;
 
+    pa_channel_map default_channel_map;
     pa_sample_spec default_sample_spec;
     unsigned default_n_fragments, default_fragment_size_msec;
 

src/pulsecore/modargs.c

@@ -274,11 +274,15 @@ int pa_modargs_get_sample_spec(pa_modargs *ma, pa_sample_spec *rss) {
     pa_assert(rss);
 
     ss = *rss;
-    if ((pa_modargs_get_value_u32(ma, "rate", &ss.rate)) < 0)
+    if ((pa_modargs_get_value_u32(ma, "rate", &ss.rate)) < 0 ||
+        ss.rate <= 0 ||
+        ss.rate > PA_RATE_MAX)
         return -1;
 
     channels = ss.channels;
-    if ((pa_modargs_get_value_u32(ma, "channels", &channels)) < 0)
+    if ((pa_modargs_get_value_u32(ma, "channels", &channels)) < 0 ||
+        channels <= 0 ||
+        channels >= PA_CHANNELS_MAX)
         return -1;
     ss.channels = (uint8_t) channels;
 
@@ -314,7 +318,12 @@ int pa_modargs_get_channel_map(pa_modargs *ma, const char *name, pa_channel_map
     return 0;
 }
 
-int pa_modargs_get_sample_spec_and_channel_map(pa_modargs *ma, pa_sample_spec *rss, pa_channel_map *rmap, pa_channel_map_def_t def) {
+int pa_modargs_get_sample_spec_and_channel_map(
+        pa_modargs *ma,
+        pa_sample_spec *rss,
+        pa_channel_map *rmap,
+        pa_channel_map_def_t def) {
+
     pa_sample_spec ss;
     pa_channel_map map;
 
@@ -327,7 +336,10 @@ int pa_modargs_get_sample_spec_and_channel_map(pa_modargs *ma, pa_sample_spec *r
     if (pa_modargs_get_sample_spec(ma, &ss) < 0)
         return -1;
 
-    pa_channel_map_init_extend(&map, ss.channels, def);
+    map = *rmap;
+
+    if (ss.channels != map.channels)
+        pa_channel_map_init_extend(&map, ss.channels, def);
 
     if (pa_modargs_get_channel_map(ma, NULL, &map) < 0)
         return -1;

src/pulsecore/protocol-native.c

@@ -3125,6 +3125,9 @@ static void command_get_server_info(pa_pdispatch *pd, uint32_t command, uint32_t
 
     pa_tagstruct_putu32(reply, c->protocol->core->cookie);
 
+    if (c->version >= 15)
+        pa_tagstruct_put_channel_map(reply, &c->protocol->core->default_channel_map);
+
     pa_pstream_send_tagstruct(c->pstream, reply);
 }