static GPtrArray *
get_missing_plugin_strings (GList *profiles, gboolean get_descriptions)
{
	RBEncoder *encoder;
	GPtrArray *strings;
	GList *l;

	encoder = rb_encoder_new ();
	strings = g_ptr_array_new_with_free_func (g_free);
	for (l = profiles; l != NULL; l = l->next) {
		GstEncodingProfile *profile = GST_ENCODING_PROFILE (l->data);
		char **details, **descriptions;
		char **d;
		int i;

		rb_encoder_get_missing_plugins (encoder, profile, &details, &descriptions);
		d = get_descriptions ? descriptions : details;
		for (i = 0; d[i] != NULL; i++) {
			g_ptr_array_add (strings, g_strdup (d[i]));
		}
		g_strfreev (details);
		g_strfreev (descriptions);
	}
	g_ptr_array_add (strings, NULL);
	g_object_unref (encoder);

	return strings;
}
/**
 * rb_track_transfer_batch_check_profiles:
 * @batch: a #RBTrackTransferBatch
 * @missing_plugin_profiles: (out) (element-type GstPbutils.EncodingProfile): holds a #GList of #GstEncodingProfiles on return
 * @error_count: holds the number of entries that cannot be transferred on return
 *
 * Checks that all entries in the batch can be transferred in a format
 * supported by the destination.  If no encoding profile is available for
 * some entries, but installing additional plugins could make a profile
 * available, a list of profiles that require additional plugins is returned.
 *
 * Return value: %TRUE if some entries can be transferred without additional plugins
 */
gboolean
rb_track_transfer_batch_check_profiles (RBTrackTransferBatch *batch, GList **missing_plugin_profiles, int *error_count)
{
	RBEncoder *encoder = rb_encoder_new ();
	gboolean ret = FALSE;
	const GList *l;

	rb_debug ("checking profiles");

	/* first, figure out which profiles that we care about would require additional plugins to use */
	g_list_free (batch->priv->missing_plugin_profiles);
	batch->priv->missing_plugin_profiles = NULL;

	for (l = gst_encoding_target_get_profiles (batch->priv->target); l != NULL; l = l->next) {
		GstEncodingProfile *profile = GST_ENCODING_PROFILE (l->data);
		char *profile_media_type;
		profile_media_type = rb_gst_encoding_profile_get_media_type (profile);
		if (profile_media_type != NULL &&
		    (rb_gst_media_type_is_lossless (profile_media_type) == FALSE) &&
		    rb_encoder_get_missing_plugins (encoder, profile, NULL, NULL)) {
			batch->priv->missing_plugin_profiles = g_list_append (batch->priv->missing_plugin_profiles, profile);
		}
		g_free (profile_media_type);
	}
	g_object_unref (encoder);

	rb_debug ("have %d profiles with missing plugins", g_list_length (batch->priv->missing_plugin_profiles));

	for (l = batch->priv->entries; l != NULL; l = l->next) {
		RhythmDBEntry *entry = (RhythmDBEntry *)l->data;
		GstEncodingProfile *profile;

		profile = NULL;
		if (select_profile_for_entry (batch, entry, &profile, FALSE) == TRUE) {
			if (profile != NULL) {
				rb_debug ("found profile %s for %s",
					  gst_encoding_profile_get_name (profile),
					  rhythmdb_entry_get_string (entry, RHYTHMDB_PROP_LOCATION));
			} else {
				rb_debug ("copying entry %s", rhythmdb_entry_get_string (entry, RHYTHMDB_PROP_LOCATION));
			}
			ret = TRUE;
			continue;
		}

		(*error_count)++;
		if (select_profile_for_entry (batch, entry, &profile, TRUE) == FALSE) {
			rb_debug ("unable to transfer %s (media type %s)",
				  rhythmdb_entry_get_string (entry, RHYTHMDB_PROP_LOCATION),
				  rhythmdb_entry_get_string (entry, RHYTHMDB_PROP_MEDIA_TYPE));
		} else {
			rb_debug ("require additional plugins to transfer %s (media type %s)",
				  rhythmdb_entry_get_string (entry, RHYTHMDB_PROP_LOCATION),
				  rhythmdb_entry_get_string (entry, RHYTHMDB_PROP_MEDIA_TYPE));
			if (*missing_plugin_profiles == NULL) {
				*missing_plugin_profiles = g_list_copy (batch->priv->missing_plugin_profiles);
			}
		}
	}
	return ret;
}
static void
missing_encoder_response_cb (GtkDialog *dialog, gint response, RBTrackTransferQueue *queue)
{
	GClosure *retry;
	GstEncodingTarget *target;
	GPtrArray *details;
	GList *profiles;
	const GList *l;
	RBEncoder *encoder;

	switch (response) {
	case GTK_RESPONSE_YES:
		/* 'continue' -> start the batch */
		rb_debug ("starting batch regardless of missing plugins");
		actually_start_batch (queue);
		break;

	case GTK_RESPONSE_CANCEL:
	case GTK_RESPONSE_DELETE_EVENT:
		/* 'cancel' -> cancel the batch and start the next one */
		rb_debug ("cancelling batch");
		_rb_track_transfer_batch_cancel (queue->priv->current);
		g_object_unref (queue->priv->current);
		queue->priv->current = NULL;

		start_next_batch (queue);
		break;

	case GTK_RESPONSE_ACCEPT:
		/* 'install plugins' -> try to install encoder/muxer */

		/* get profiles that need plugins installed */
		profiles = NULL;
		encoder = rb_encoder_new ();
		g_object_get (queue->priv->current, "encoding-target", &target, NULL);
		for (l = gst_encoding_target_get_profiles (target); l != NULL; l = l->next) {
			GstEncodingProfile *profile = GST_ENCODING_PROFILE (l->data);
			char *profile_media_type;
			profile_media_type = rb_gst_encoding_profile_get_media_type (profile);
			if (profile_media_type != NULL &&
			    (rb_gst_media_type_is_lossless (profile_media_type) == FALSE) &&
			    rb_encoder_get_missing_plugins (encoder, profile, NULL, NULL)) {
				profiles = g_list_append (profiles, profile);
			}
			g_free (profile_media_type);
		}
		g_object_unref (encoder);
		g_object_unref (target);

		if (profiles == NULL) {
			rb_debug ("apparently we don't need any plugins any more");
			actually_start_batch (queue);
			break;
		}

		rb_debug ("attempting plugin installation");
		details = get_missing_plugin_strings (profiles, FALSE);
		retry = g_cclosure_new ((GCallback) missing_plugins_retry_cb,
					g_object_ref (queue),
					(GClosureNotify) g_object_unref);
		g_closure_set_marshal (retry, g_cclosure_marshal_VOID__BOOLEAN);
		if (rb_missing_plugins_install ((const char **)details->pdata, FALSE, retry)) {
			rb_debug ("attempting to install missing plugins for transcoding");
		} else {
			rb_debug ("proceeding without the missing plugins for transcoding");
			actually_start_batch (queue);
		}

		g_closure_sink (retry);
		g_ptr_array_free (details, TRUE);
		g_list_free (profiles);
		break;

	default:
		g_assert_not_reached ();
	}

	gtk_widget_destroy (GTK_WIDGET (dialog));
}