alsa-udev: add listener to created audio softdsp endpoints when alsa nodes are created

modules/module-pw-alsa-udev.c

@@ -14,7 +14,143 @@
 #include <wp/wp.h>
 #include <pipewire/pipewire.h>
 
+#define NAME "module-pw-alsa-udev"
+
+struct impl {
+  WpCore *wp_core;
+
+  struct pw_remote *remote;
+  struct spa_hook remote_listener;
+
+  struct pw_registry_proxy *registry_proxy;
+  struct spa_hook registry_listener;
+};
+
+static void
+handle_node(struct impl *impl, uint32_t id, uint32_t parent_id,
+            const struct spa_dict *props)
+{
+  const gchar *media_class = NULL, *node_name = NULL;
+  struct spa_proxy *proxy = NULL;
+  GVariantBuilder b;
+  g_autoptr(GVariant) endpoint_props = NULL;
+
+  /* Make sure the node has properties */
+  if (!props) {
+    g_warning(NAME" %p: node has no properties, skipping...", impl);
+    return;
+  }
+
+  /* Make sure the media class is audio */
+  /* FIXME: need to handle only alsa nodes */
+  media_class = spa_dict_lookup(props, "media.class");
+  if (!g_str_has_prefix (media_class, "Audio/"))
+    return;
+
+  /* Get the device name */
+  node_name = spa_dict_lookup(props, "node.name");
+  
+  /* Get the proxy */
+  proxy = pw_registry_proxy_bind (impl->registry_proxy, id,
+      PW_TYPE_INTERFACE_Node, PW_VERSION_NODE, 0);
+
+  /* Build the GVariant properties for the endpoint */
+  g_variant_builder_init (&b, G_VARIANT_TYPE_VARDICT);
+  g_variant_builder_add (&b, "{sv}", "name",
+      g_variant_new_take_string (g_strdup_printf ("Endpoint %u: %s", id, node_name)));
+  g_variant_builder_add (&b, "{sv}",
+      "media-class", g_variant_new_string (media_class));
+  g_variant_builder_add (&b, "{sv}",
+      "node-proxy", g_variant_new_uint64 ((guint64) proxy));
+  endpoint_props = g_variant_builder_end (&b);
+
+  /* Create the endpoint */
+  wp_factory_make (impl->wp_core, "pw-audio-softdsp-endpoint", WP_TYPE_ENDPOINT,
+      endpoint_props);
+}
+
+static void
+registry_global(void *data,uint32_t id, uint32_t parent_id,
+		uint32_t permissions, uint32_t type, uint32_t version,
+		const struct spa_dict *props)
+{
+  struct impl *impl = data;
+
+  /* Only handle nodes */
+  switch (type) {
+  case PW_TYPE_INTERFACE_Node:
+    handle_node(impl, id, parent_id, props);
+    break;
+
+  default:
+    break;
+  }
+}
+
+static const struct pw_registry_proxy_events registry_events = {
+  PW_VERSION_REGISTRY_PROXY_EVENTS,
+  .global = registry_global,
+};
+
+static void on_state_changed(void *_data, enum pw_remote_state old,
+    enum pw_remote_state state, const char *error)
+{
+  struct impl *impl = _data;
+  struct pw_core_proxy *core_proxy;
+
+  switch (state) {
+  case PW_REMOTE_STATE_CONNECTED:
+    core_proxy = pw_remote_get_core_proxy (impl->remote);
+    impl->registry_proxy = pw_core_proxy_get_registry (core_proxy,
+        PW_TYPE_INTERFACE_Registry, PW_VERSION_REGISTRY, 0);
+    pw_registry_proxy_add_listener(impl->registry_proxy,
+        &impl->registry_listener, &registry_events, impl);
+    break;
+  
+  case PW_REMOTE_STATE_ERROR:
+    /* TODO quit wireplumber */
+    break;
+
+  case PW_REMOTE_STATE_UNCONNECTED:
+    /* TODO quit wireplumber */
+    break;
+  
+  default:
+    break;
+  }
+}
+
+static const struct pw_remote_events remote_events = {
+  PW_VERSION_REMOTE_EVENTS,
+  .state_changed = on_state_changed,
+};
+
+static void
+module_destroy (gpointer data)
+{
+  struct impl *impl = data;
+
+  g_debug ("module-pipewire destroy");
+
+  g_slice_free (struct impl, impl);
+}
+
 void
 wireplumber__module_init (WpModule * module, WpCore * core, GVariant * args)
 {
+  /* This needs to create the alsa sink and alsa source nodes, but since
+   * this is already implemented in the alsa-module of pipewire, for now
+   * we just listen for the alsa nodes created by pipewire. We eventually
+   * need to move all the node creation logic here */
+
+  /* Create the impl */
+  struct impl *impl = g_new0(struct impl, 1);
+  impl->wp_core = core;
+  impl->remote = wp_core_get_global(core, WP_GLOBAL_PW_REMOTE);
+
+  /* Set destroy callback for impl */
+  wp_module_set_destroy_callback (module, module_destroy, impl);
+
+  /* Add a state changed listener */
+  pw_remote_add_listener(impl->remote, &impl->remote_listener, &remote_events, impl);
 }