How Do Upload With angularjs In Codeigniter

im sorry mr im try this code for upload with angular in codeigniter but file and data not insert to database and file not upload, :) please corectly im no find that tutorial in google please..

        $postdata = file_get_contents("php://input");
        $data = json_decode($postdata);

        $config['upload_path']      = 'assets/img/img_berita/';
        $config['allowed_types']    = 'gif|jpg|png';
        $config['max_size']         = '1000';
        $config['max_width']        = '1024';
        $config['max_height']       = '768';
        $config['encrypt_name']     = TRUE;

        $this->load->library('upload', $config);

        if( ! $this->upload->do_upload($data($_FILES['file'])) ) {
            $this->set_model->update_data('berita', array('gambar' => $data['file']['name']), array('id_berita' => $data['id_berita']) );
            echo '{"stat" : "Success!"}';
        } else {
            echo '{"stat" : "Try Again!"}';
        }

    app.controller('berita_uploadImage', function($scope,$http,$routeParams,$location,Upload) {
        $scope.ImageInfo = 
        $scope.dataInfo = [];

        $scope.onFileSelect = function(file) {
            //console.log($scope.picFile);
            if (!file) return;
            console.log(file);
            Upload.upload({
                method : 'POST',
                url : '<?php echo base_url();?>home/dashboard/admin/upload_image_berita',
                data : JSON.stringify({'id_berita':$scope.id_berita,file:file}),
            }).success(function(data) {
                console.log($scope.id_berita);
                console.log(file);
                console.log(data.stat);
            });
        }

        $scope.id_berita = $routeParams.id_berita;
        $http.get('<?php echo base_url(); ?>home/dashboard/admin/getImage_berita/' + $scope.id_berita ).success(function(result) {
            $scope.dataInfo = result;
        });