pipewire: add i18n initialization

Initialize the i18n support.
Add two methods to call the i18n interface.
Add defines for _() and N_() for translations.

meson.build

@@ -186,7 +186,7 @@ cdata.set('PIPEWIRE_API_VERSION', '"@0@"'.format(apiversion))
 cdata.set('PIPEWIRE_DATADIR', '"@0@"'.format(pipewire_datadir))
 cdata.set('LOCALEDIR', '"@0@"'.format(pipewire_localedir))
 cdata.set('LIBDIR', '"@0@"'.format(pipewire_libdir))
-cdata.set('GETTEXT_PACKAGE', '"pipewire"')
+cdata.set('GETTEXT_PACKAGE', '"@0@"'.format(meson.project_name()))
 cdata.set('PIPEWIRE_LICENSE', '"MIT"')
 cdata.set('PIPEWIRE_PACKAGE_ORIGIN', '"Unknown package origin"')
 cdata.set('PIPEWIRE_PACKAGE_NAME', '"PipeWire source release"')

src/pipewire/pipewire.c

@@ -49,6 +49,8 @@
 
 #define SUPPORTLIB	"support/libspa-support"
 
+static struct spa_i18n *_pipewire_i18n = NULL;
+
 struct plugin {
 	struct spa_list link;
 	char *filename;
@@ -376,6 +378,18 @@ static const char *i18n_ntext(void *object, const char *msgid, const char *msgid
 	return dngettext(support->i18n_domain, msgid, msgid_plural, n);
 }
 
+static void init_i18n(struct support *support)
+{
+	/* Load locale from the environment. */
+	setlocale(LC_ALL, "");
+	/* Set LC_NUMERIC to C so that floating point strings are consistently
+	 * formatted and parsed across locales. */
+	setlocale(LC_NUMERIC, "C");
+	bindtextdomain(GETTEXT_PACKAGE, LOCALEDIR);
+	bind_textdomain_codeset(GETTEXT_PACKAGE, "UTF-8");
+	pw_set_domain(GETTEXT_PACKAGE);
+}
+
 static void *add_i18n(struct support *support)
 {
 	static struct spa_i18n_methods i18n_methods = {
@@ -387,11 +401,25 @@ static void *add_i18n(struct support *support)
 			SPA_TYPE_INTERFACE_I18N,
 			SPA_VERSION_I18N,
 			&i18n_methods, support);
+	_pipewire_i18n = (struct spa_i18n*) &support->i18n_iface;
+
 	support->support[support->n_support++] =
-		SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_I18N, &support->i18n_iface);
+		SPA_SUPPORT_INIT(SPA_TYPE_INTERFACE_I18N, _pipewire_i18n);
+
 	return 0;
 }
 
+SPA_EXPORT
+const char *pw_gettext(const char *msgid)
+{
+	return spa_i18n_text(_pipewire_i18n, msgid);
+}
+SPA_EXPORT
+const char *pw_bgettext(const char *msgid, const char *msgid_plural, unsigned long int n)
+{
+	return spa_i18n_ntext(_pipewire_i18n, msgid, msgid_plural, n);
+}
+
 #ifdef HAVE_SYSTEMD
 static struct spa_log *load_journal_logger(struct support *support)
 {
@@ -465,6 +493,8 @@ void pw_init(int *argc, char **argv[])
 	if ((str = getenv("PIPEWIRE_DEBUG")))
 		configure_debug(support, str);
 
+	init_i18n(support);
+
 	if ((str = getenv("SPA_PLUGIN_DIR")) == NULL)
 		str = PLUGINDIR;
 	support->plugin_dir = str;

src/pipewire/pipewire.h

@@ -30,6 +30,7 @@ extern "C" {
 #endif
 
 #include <spa/support/plugin.h>
+#include <spa/support/i18n.h>
 
 #include <pipewire/array.h>
 #include <pipewire/client.h>
@@ -154,6 +155,12 @@ struct spa_handle *pw_load_spa_handle(const char *lib,
 
 int pw_unload_spa_handle(struct spa_handle *handle);
 
+const char *pw_gettext(const char *msgid);
+const char *pw_ngettext(const char *msgid, const char *msgid_plural, unsigned long int n);
+
+#define _(String)	(pw_gettext(String))
+#define N_(String)	(String)
+
 #ifdef __cplusplus
 }
 #endif