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[sound-juicer] mb4: add musicbrainz4 to build system

commit 52aacc3d0977f314dda63fe3cd5b0662aba7cc03
Author: Christophe Fergeau <cfergeau redhat com>
Date:   Sat Jul 30 00:51:07 2011 +0200

    mb4: add musicbrainz4 to build system
    
    The 2 added sj-metadata-musicbrainz4.[ch] source files are copies
    of the musicbrainz3 code which will be used as a base for
    libmusicbrainz4 support.
    It's disabled for now so that building of non-compilable code
    isn't attempted.

 configure.in                         |   41 ++-
 libjuicer/Makefile.am                |   13 +-
 libjuicer/sj-metadata-musicbrainz4.c |  460 ++++++++++++++++++++++++++++++++++
 libjuicer/sj-metadata-musicbrainz4.h |   56 ++++
 po/POTFILES.in                       |    1 +
 5 files changed, 555 insertions(+), 16 deletions(-)
---
diff --git a/configure.in b/configure.in
index 63bd52b..e0cd0df 100644
--- a/configure.in
+++ b/configure.in
@@ -70,21 +70,34 @@ AM_GST_ELEMENT_CHECK(flacenc,,AC_MSG_WARN([The 'flacenc' element was not found.
 AM_GST_ELEMENT_CHECK(wavenc,,AC_MSG_WARN([The 'wavenc' element was not found. This will cause encoding to Wave to fail.]))
 AM_GST_ELEMENT_CHECK(giosink,,AC_MSG_WARN([The 'giosink' element was not found. This will cause Sound Juicer to fail at runtime.]))
 
-# Find required MusicBrainz3
-PKG_CHECK_MODULES(MUSICBRAINZ3, libmusicbrainz3 >= 3.0.2, [have_mb3=yes], [have_mb3=no])
-AC_SUBST(MUSICBRAINZ3_CFLAGS)
-AC_SUBST(MUSICBRAINZ3_LIBS)
-AM_CONDITIONAL([HAVE_MUSICBRAINZ3], [test "$have_mb3" = "yes"])
-if test "$have_mb3" = "yes" ; then
-	AC_DEFINE([HAVE_MUSICBRAINZ3], 1, [Whether libmusicbrainz3 is available])
-else
-        AC_MSG_ERROR([libmusicbrainz3 needs to be available for sound-juicer to build])
+# Find optional MusicBrainz4
+PKG_CHECK_MODULES(MUSICBRAINZ4, libmusicbrainz4, [have_mb4=yes], [have_mb4=no])
+AC_SUBST(MUSICBRAINZ4_CFLAGS)
+AC_SUBST(MUSICBRAINZ4_LIBS)
+if test "$have_mb4" = "yes" ; then
+        dnl AC_DEFINE([HAVE_MUSICBRAINZ4], 1, [Whether libmusicbrainz4 is available])
+        AC_MSG_WARN([libmusicbrainz4 support disabled since it's currently non-functional])
+        have_mb4="no"
 fi
-
-oldlibs=$LIBS
-LIBS="$LIBS $MUSICBRAINZ3_LIBS"
-AC_CHECK_FUNCS(mb_extract_uuid)
-LIBS="$oldlibs"
+AM_CONDITIONAL([HAVE_MUSICBRAINZ4], [test "$have_mb4" = "yes"])
+
+# MusicBrainz3 fallback
+if test "$have_mb4" != "yes" ; then
+        PKG_CHECK_MODULES(MUSICBRAINZ3, libmusicbrainz3 >= 3.0.2, [have_mb3=yes], [have_mb3=no])
+        AC_SUBST(MUSICBRAINZ3_CFLAGS)
+        AC_SUBST(MUSICBRAINZ3_LIBS)
+        if test "$have_mb3" = "yes" ; then
+                AC_DEFINE([HAVE_MUSICBRAINZ3], 1, [Whether libmusicbrainz3 is available])
+        else
+                AC_MSG_ERROR([libmusicbrainz4 or libmusicbrainz3 need to be available for sound-juicer to build])
+        fi
+
+        oldlibs=$LIBS
+        LIBS="$LIBS $MUSICBRAINZ3_LIBS"
+        AC_CHECK_FUNCS(mb_extract_uuid)
+        LIBS="$oldlibs"
+fi
+AM_CONDITIONAL([HAVE_MUSICBRAINZ3], [test "$have_mb3" = "yes"])
 
 # Find gio for the metadata extractor
 PKG_CHECK_MODULES(GIO, gio-2.0)
diff --git a/libjuicer/Makefile.am b/libjuicer/Makefile.am
index 9ab4701..fc6e834 100644
--- a/libjuicer/Makefile.am
+++ b/libjuicer/Makefile.am
@@ -24,7 +24,6 @@ libjuicer_la_CPPFLAGS = \
 
 libjuicer_la_CFLAGS = \
 	$(WARN_CFLAGS)	\
-	$(MUSICBRAINZ3_CFLAGS) \
 	$(GSTREAMER_CFLAGS) \
 	$(BURN_CFLAGS) \
 	$(UI_CFLAGS) \
@@ -32,7 +31,6 @@ libjuicer_la_CFLAGS = \
 	$(AM_CFLAGS)
 
 libjuicer_la_LIBADD = \
-	$(MUSICBRAINZ3_LIBS) \
 	$(GSTREAMER_LIBS) \
 	$(BURN_LIBS) \
 	$(UI_LIBS) \
@@ -46,8 +44,19 @@ if HAVE_MUSICBRAINZ3
 libjuicer_la_SOURCES += \
 	sj-metadata-musicbrainz3.h \
 	sj-metadata-musicbrainz3.c
+libjuicer_la_LIBADD += $(MUSICBRAINZ3_LIBS)
+libjuicer_la_CFLAGS += $(MUSICBRAINZ3_CFLAGS)
 endif
 
+if HAVE_MUSICBRAINZ4
+libjuicer_la_SOURCES += \
+	sj-metadata-musicbrainz4.h \
+	sj-metadata-musicbrainz4.c
+libjuicer_la_LIBADD += $(MUSICBRAINZ4_LIBS)
+libjuicer_la_CFLAGS += $(MUSICBRAINZ4_CFLAGS)
+endif
+
+
 #
 # Build the GValue marshals
 #
diff --git a/libjuicer/sj-metadata-musicbrainz4.c b/libjuicer/sj-metadata-musicbrainz4.c
new file mode 100644
index 0000000..ee96946
--- /dev/null
+++ b/libjuicer/sj-metadata-musicbrainz4.c
@@ -0,0 +1,460 @@
+/*
+ * sj-metadata-musicbrainz3.c
+ * Copyright (C) 2008 Ross Burton <ross burtonini com>
+ * Copyright (C) 2008 Bastien Nocera <hadess hadess net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif /* HAVE_CONFIG_H */
+
+#include <string.h>
+#include <stdlib.h>
+#include <glib.h>
+#include <glib-object.h>
+#include <gconf/gconf-client.h>
+#include <musicbrainz3/mb_c.h>
+
+#include "sj-metadata-musicbrainz3.h"
+#include "sj-structures.h"
+#include "sj-error.h"
+
+#define GET(field, function, obj) {						\
+	function (obj, buffer, sizeof (buffer));				\
+	if (field)								\
+		g_free (field);							\
+	if (*buffer == '\0')							\
+		field = NULL;							\
+	else									\
+		field = g_strdup (buffer);					\
+}
+
+#if HAVE_MB_EXTRACT_UUID
+#define GET_ID(field, function, obj) {						\
+	char uuid_buffer[37];							\
+        function (obj, buffer, sizeof (buffer));				\
+	mb_extract_uuid (buffer, uuid_buffer, sizeof (uuid_buffer));		\
+	if (field)								\
+		g_free (field);							\
+	if (*uuid_buffer == '\0')						\
+		field = NULL;							\
+	else									\
+		field = g_strdup (uuid_buffer);					\
+}
+#else
+#define GET_ID(field, function, obj) {						\
+	if (field)								\
+		g_free (field);							\
+	field = NULL;								\
+}
+#endif /* HAVE_MB_EXTRACT_UUID */
+
+#define GCONF_MUSICBRAINZ_SERVER "/apps/sound-juicer/musicbrainz_server"
+#define GCONF_PROXY_USE_PROXY "/system/http_proxy/use_http_proxy"
+#define GCONF_PROXY_HOST "/system/http_proxy/host"
+#define GCONF_PROXY_PORT "/system/http_proxy/port"
+#define GCONF_PROXY_USE_AUTHENTICATION "/system/http_proxy/use_authentication"
+#define GCONF_PROXY_USERNAME "/system/http_proxy/authentication_user"
+#define GCONF_PROXY_PASSWORD "/system/http_proxy/authentication_password"
+
+typedef struct {
+  MbWebService mb;
+  MbDisc disc;
+  char *cdrom;
+  /* Proxy */
+  char *http_proxy;
+  int http_proxy_port;
+} SjMetadataMusicbrainz3Private;
+
+#define GET_PRIVATE(o)  \
+  (G_TYPE_INSTANCE_GET_PRIVATE ((o), SJ_TYPE_METADATA_MUSICBRAINZ3, SjMetadataMusicbrainz3Private))
+
+enum {
+  PROP_0,
+  PROP_DEVICE,
+  PROP_USE_PROXY,
+  PROP_PROXY_HOST,
+  PROP_PROXY_PORT,
+};
+
+static void metadata_interface_init (gpointer g_iface, gpointer iface_data);
+
+G_DEFINE_TYPE_WITH_CODE (SjMetadataMusicbrainz3,
+                         sj_metadata_musicbrainz3,
+                         G_TYPE_OBJECT,
+                         G_IMPLEMENT_INTERFACE (SJ_TYPE_METADATA,
+                                                metadata_interface_init));
+
+
+/*
+ * Private methods
+ */
+
+static AlbumDetails *
+make_album_from_release (MbRelease *release)
+{
+  AlbumDetails *album;
+  char buffer[512];
+  MbArtist artist;
+  char *new_title;
+  int i;
+
+  g_assert (release);
+
+  album = g_new0 (AlbumDetails, 1);
+
+  GET_ID (album->album_id, mb_release_get_id, release);
+  GET (album->title, mb_release_get_title, release);
+  new_title = sj_metadata_helper_scan_disc_number (album->title, &album->disc_number);
+  if (new_title) {
+    g_free (album->title);
+    album->title = new_title;
+  }
+
+  artist = mb_release_get_artist (release);
+  GET_ID (album->artist_id, mb_artist_get_id, artist);
+  GET (album->artist, mb_artist_get_name, artist);
+  GET (album->artist_sortname, mb_artist_get_sortname, artist);
+
+  if (mb_release_get_num_release_events (release) >= 1) {
+    MbReleaseEvent event;
+    char *date = NULL;
+
+    event = mb_release_get_release_event (release, 0);
+    GET (date, mb_release_event_get_date, event);
+    album->release_date = sj_metadata_helper_scan_date (date);
+    g_free (date);
+  }
+
+  album->number = mb_release_get_num_tracks (release);
+  GET (album->asin, mb_release_get_asin, release);
+
+  for (i = 0; i < mb_release_get_num_relations (release); i++) {
+    MbRelation relation;
+    char *type = NULL;
+
+    relation = mb_release_get_relation (release, i);
+    GET(type, mb_relation_get_type, relation);
+    if (type && g_str_equal (type, "http://musicbrainz.org/ns/rel-1.0#Wikipedia";)) {
+      GET (album->wikipedia, mb_relation_get_target_id, relation);
+    } else if (type && g_str_equal (type, "http://musicbrainz.org/ns/rel-1.0#Discogs";)) {
+      GET (album->discogs, mb_relation_get_target_id, relation);
+      continue;
+    }
+    g_free (type);
+  }
+
+  for (i = 0; i < mb_release_get_num_types (release); i++) {
+    mb_release_get_type (release, i, buffer, sizeof(buffer));
+
+    if (g_str_has_suffix (buffer, "#Spokenword")
+    	|| g_str_has_suffix (buffer, "#Interview")
+    	|| g_str_has_suffix (buffer, "#Audiobook")) {
+      album->is_spoken_word = TRUE;
+      break;
+    }
+  }
+
+  for (i = 0; i < album->number; i++) {
+    MbTrack mbt;
+    TrackDetails *track;
+
+    mbt = mb_release_get_track (release, i);
+    track = g_new0 (TrackDetails, 1);
+
+    track->album = album;
+
+    track->number = i + 1;
+    GET_ID (track->track_id, mb_track_get_id, mbt);
+
+    GET (track->title, mb_track_get_title, mbt);
+    track->duration = mb_track_get_duration (mbt) / 1000;
+
+    artist = mb_track_get_artist (mbt);
+    if (artist == NULL)
+      artist = mb_release_get_artist (release);
+    GET_ID (track->artist_id, mb_artist_get_id, artist);
+    GET (track->artist, mb_artist_get_name, artist);
+    GET (track->artist_sortname, mb_artist_get_sortname, artist);
+
+    album->tracks = g_list_append (album->tracks, track);
+  }
+
+  return album;
+}
+
+static void
+fill_empty_durations (MbDisc *disc, AlbumDetails *album)
+{
+  if (disc == NULL)
+    return;
+}
+
+static MbReleaseIncludes
+get_release_includes (void)
+{
+    MbReleaseIncludes includes;
+
+    includes = mb_release_includes_new ();
+    includes = mb_release_includes_artist (includes);
+    includes = mb_release_includes_tracks (includes);
+    includes = mb_artist_includes_release_events (includes);
+    includes = mb_track_includes_url_relations (includes);
+
+    return includes;
+}
+
+/*
+ * Virtual methods
+ */
+
+static GList *
+mb_list_albums (SjMetadata *metadata, char **url, GError **error)
+{
+  SjMetadataMusicbrainz3Private *priv;
+  GList *albums = NULL;
+  MbQuery query;
+  MbReleaseFilter filter;
+  MbResultList results;
+  MbRelease release;
+  char *id = NULL;
+  char buffer[1024];
+  int i;
+  g_return_val_if_fail (SJ_IS_METADATA_MUSICBRAINZ3 (metadata), NULL);
+
+  priv = GET_PRIVATE (metadata);
+
+  if (sj_metadata_helper_check_media (priv->cdrom, error) == FALSE) {
+    return NULL;
+  }
+
+  priv->disc = mb_read_disc (priv->cdrom);
+  if (priv->disc == NULL)
+    return NULL;
+
+  if (url != NULL) {
+    mb_get_submission_url (priv->disc, NULL, 0, buffer, sizeof (buffer));
+    *url = g_strdup (buffer);
+  }
+
+  if (g_getenv("MUSICBRAINZ_FORCE_DISC_ID")) {
+    id = g_strdup (g_getenv("MUSICBRAINZ_FORCE_DISC_ID"));
+  } else {
+    GET(id, mb_disc_get_id, priv->disc);
+  }
+
+  query = mb_query_new (priv->mb, "sound-juicer");
+  filter = mb_release_filter_new ();
+  filter = mb_release_filter_disc_id (filter, id);
+  results = mb_query_get_releases (query, filter);
+  mb_release_filter_free (filter);
+  g_free (id);
+
+  if (results == NULL) {
+    mb_query_free (query);
+    return NULL;
+  }
+
+  if (mb_result_list_get_size (results) == 0) {
+    mb_result_list_free (results);
+    mb_query_free (query);
+    return NULL;
+  }
+
+  for (i = 0; i < mb_result_list_get_size (results); i++) {
+    AlbumDetails *album;
+    MbReleaseIncludes includes;
+    char buffer[512];
+
+    release = mb_result_list_get_release (results, i);
+    if(release) {
+      mb_release_get_id (release, buffer, sizeof (buffer));
+      includes = get_release_includes ();
+      release = mb_query_get_release_by_id (query, buffer, includes);
+      if(release) {
+        mb_release_includes_free (includes);
+        album = make_album_from_release (release);
+        album->metadata_source = SOURCE_MUSICBRAINZ;
+        fill_empty_durations (priv->disc, album);
+        albums = g_list_append (albums, album);
+        mb_release_free (release);
+      }
+    }
+  }
+  mb_result_list_free (results);
+  mb_query_free (query);
+
+  return albums;
+}
+
+/*
+ * GObject methods
+ */
+
+static void
+metadata_interface_init (gpointer g_iface, gpointer iface_data)
+{
+  SjMetadataClass *klass = (SjMetadataClass*)g_iface;
+
+  klass->list_albums = mb_list_albums;
+}
+
+static void
+sj_metadata_musicbrainz3_init (SjMetadataMusicbrainz3 *self)
+{
+  GConfClient *gconf_client;
+  gchar *server_name;
+
+  SjMetadataMusicbrainz3Private *priv;
+
+  priv = GET_PRIVATE (self);
+
+  priv->mb = mb_webservice_new ();
+
+  gconf_client = gconf_client_get_default ();
+
+  server_name = gconf_client_get_string (gconf_client, GCONF_MUSICBRAINZ_SERVER, NULL);
+
+  if (server_name && strcmp (server_name, "") != 0) {
+    mb_webservice_set_host (priv->mb, server_name);
+  }
+
+  g_free (server_name);
+
+  /* Set the HTTP proxy */
+  if (gconf_client_get_bool (gconf_client, GCONF_PROXY_USE_PROXY, NULL)) {
+    char *proxy_host;
+    int port;
+
+    proxy_host = gconf_client_get_string (gconf_client, GCONF_PROXY_HOST, NULL);
+    mb_webservice_set_proxy_host (priv->mb, proxy_host);
+    g_free (proxy_host);
+
+    port = gconf_client_get_int (gconf_client, GCONF_PROXY_PORT, NULL);
+    mb_webservice_set_proxy_port (priv->mb, port);
+
+    if (gconf_client_get_bool (gconf_client, GCONF_PROXY_USE_AUTHENTICATION, NULL)) {
+      char *username, *password;
+
+      username = gconf_client_get_string (gconf_client, GCONF_PROXY_USERNAME, NULL);
+      mb_webservice_set_proxy_username (priv->mb, username);
+      g_free (username);
+
+      password = gconf_client_get_string (gconf_client, GCONF_PROXY_PASSWORD, NULL);
+      mb_webservice_set_proxy_password (priv->mb, password);
+      g_free (password);
+    }
+  }
+
+  g_object_unref (gconf_client);
+}
+
+static void
+sj_metadata_musicbrainz3_get_property (GObject *object, guint property_id,
+                                       GValue *value, GParamSpec *pspec)
+{
+  SjMetadataMusicbrainz3Private *priv = GET_PRIVATE (object);
+  g_assert (priv);
+
+  switch (property_id) {
+  case PROP_DEVICE:
+    g_value_set_string (value, priv->cdrom);
+    break;
+  case PROP_PROXY_HOST:
+    g_value_set_string (value, priv->http_proxy);
+    break;
+  case PROP_PROXY_PORT:
+    g_value_set_int (value, priv->http_proxy_port);
+    break;
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+  }
+}
+
+static void
+sj_metadata_musicbrainz3_set_property (GObject *object, guint property_id,
+                                       const GValue *value, GParamSpec *pspec)
+{
+  SjMetadataMusicbrainz3Private *priv = GET_PRIVATE (object);
+  g_assert (priv);
+
+  switch (property_id) {
+  case PROP_DEVICE:
+    if (priv->cdrom)
+      g_free (priv->cdrom);
+    priv->cdrom = g_value_dup_string (value);
+    break;
+  case PROP_PROXY_HOST:
+    if (priv->http_proxy) {
+      g_free (priv->http_proxy);
+    }
+    priv->http_proxy = g_value_dup_string (value);
+    /* TODO: check this unsets the proxy if NULL, or should we pass "" ? */
+    mb_webservice_set_proxy_host (priv->mb, priv->http_proxy);
+    break;
+  case PROP_PROXY_PORT:
+    priv->http_proxy_port = g_value_get_int (value);
+    mb_webservice_set_proxy_port (priv->mb, priv->http_proxy_port);
+    break;
+  default:
+    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+  }
+}
+
+static void
+sj_metadata_musicbrainz3_finalize (GObject *object)
+{
+  SjMetadataMusicbrainz3Private *priv;
+  
+  priv = GET_PRIVATE (object);
+
+  if (priv->mb != NULL) {
+    mb_webservice_free (priv->mb);
+    priv->mb = NULL;
+  }
+  g_free (priv->cdrom);
+
+  G_OBJECT_CLASS (sj_metadata_musicbrainz3_parent_class)->finalize (object);
+}
+
+static void
+sj_metadata_musicbrainz3_class_init (SjMetadataMusicbrainz3Class *class)
+{
+  GObjectClass *object_class = (GObjectClass*)class;
+
+  g_type_class_add_private (class, sizeof (SjMetadataMusicbrainz3Private));
+
+  object_class->get_property = sj_metadata_musicbrainz3_get_property;
+  object_class->set_property = sj_metadata_musicbrainz3_set_property;
+  object_class->finalize = sj_metadata_musicbrainz3_finalize;
+
+  g_object_class_override_property (object_class, PROP_DEVICE, "device");
+  g_object_class_override_property (object_class, PROP_PROXY_HOST, "proxy-host");
+  g_object_class_override_property (object_class, PROP_PROXY_PORT, "proxy-port");
+}
+
+
+/*
+ * Public methods.
+ */
+
+GObject *
+sj_metadata_musicbrainz3_new (void)
+{
+  return g_object_new (SJ_TYPE_METADATA_MUSICBRAINZ3, NULL);
+}
diff --git a/libjuicer/sj-metadata-musicbrainz4.h b/libjuicer/sj-metadata-musicbrainz4.h
new file mode 100644
index 0000000..bcc337d
--- /dev/null
+++ b/libjuicer/sj-metadata-musicbrainz4.h
@@ -0,0 +1,56 @@
+/*
+ * sj-metadata-musicbrainz3.h
+ * Copyright (C) 2008 Ross Burton <ross burtonini com>
+ * Copyright (C) 2008 Bastien Nocera <hadess hadess net>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef SJ_METADATA_MUSICBRAINZ3_H
+#define SJ_METADATA_MUSICBRAINZ3_H
+
+#include <glib-object.h>
+#include "sj-metadata.h"
+
+G_BEGIN_DECLS
+
+#define SJ_TYPE_METADATA_MUSICBRAINZ3           (sj_metadata_musicbrainz3_get_type ())
+#define SJ_METADATA_MUSICBRAINZ3(obj)           (G_TYPE_CHECK_INSTANCE_CAST ((obj), SJ_TYPE_METADATA_MUSICBRAINZ3, SjMetadataMusicbrainz3))
+#define SJ_METADATA_MUSICBRAINZ3_CLASS(vtable)  (G_TYPE_CHECK_CLASS_CAST ((vtable), SJ_TYPE_METADATA_MUSICBRAINZ3, SjMetadataMusicbrainz3Class))
+#define SJ_IS_METADATA_MUSICBRAINZ3(obj)        (G_TYPE_CHECK_INSTANCE_TYPE ((obj), SJ_TYPE_METADATA_MUSICBRAINZ3))
+#define SJ_IS_METADATA_MUSICBRAINZ3_CLASS(vtable) (G_TYPE_CHECK_CLASS_TYPE ((vtable), SJ_TYPE_METADATA_MUSICBRAINZ3))
+#define SJ_METADATA_MUSICBRAINZ3_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), SJ_TYPE_METADATA_MUSICBRAINZ3, SjMetadataMusicbrainz3Class))
+
+typedef struct _SjMetadataMusicbrainz3 SjMetadataMusicbrainz3;
+typedef struct _SjMetadataMusicbrainz3Class SjMetadataMusicbrainz3Class;
+
+struct _SjMetadataMusicbrainz3
+{
+  GObject parent;
+};
+
+struct _SjMetadataMusicbrainz3Class
+{
+  GObjectClass parent;
+};
+
+GType sj_metadata_musicbrainz3_get_type (void);
+
+GObject *sj_metadata_musicbrainz3_new (void);
+
+G_END_DECLS
+
+#endif /* SJ_METADATA_MUSICBRAINZ3_H */
diff --git a/po/POTFILES.in b/po/POTFILES.in
index 7b38ab5..d0f021d 100644
--- a/po/POTFILES.in
+++ b/po/POTFILES.in
@@ -10,6 +10,7 @@ libjuicer/sj-metadata.c
 libjuicer/sj-metadata-getter.c
 libjuicer/sj-metadata-gvfs.c
 libjuicer/sj-metadata-musicbrainz3.c
+libjuicer/sj-metadata-musicbrainz4.c
 libjuicer/sj-structures.c
 libjuicer/sj-util.c
 src/egg-play-preview.c
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