git.sesse.net Git - casparcg/blob - core/producer/scene/xml_scene_producer.cpp

   1 /*
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
   3 *
   4 * This file is part of CasparCG (www.casparcg.com).
   5 *
   6 * CasparCG is free software: you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation, either version 3 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * CasparCG is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
  18 *
  19 * Author: Helge Norberg, helge.norberg@svt.se
  20 */
  21
  22 #include "../../stdafx.h"
  23
  24 #include "xml_scene_producer.h"
  25 #include "expression_parser.h"
  26
  27 #include <boost/filesystem.hpp>
  28 #include <boost/property_tree/ptree.hpp>
  29 #include <boost/property_tree/xml_parser.hpp>
  30
  31 #include <common/env.h>
  32 #include <core/producer/frame_producer.h>
  33
  34 #include <future>
  35
  36 #include "scene_producer.h"
  37
  38 namespace caspar { namespace core { namespace scene {
  39
  40 void deduce_expression(variable& var, const variable_repository& repo)
  41 {
  42         auto expr_str = var.original_expr();
  43         auto trimmed = boost::trim_copy(expr_str);
  44
  45         if (boost::starts_with(trimmed, L"${") && boost::ends_with(trimmed, L"}"))
  46         {
  47                 expr_str = trimmed.substr(2, expr_str.length() - 3);
  48
  49                 if (var.is<double>())
  50                         var.as<double>().bind(parse_expression<double>(expr_str, repo));
  51                 else if (var.is<bool>())
  52                         var.as<bool>().bind(parse_expression<bool>(expr_str, repo));
  53                 else if (var.is<std::wstring>())
  54                         var.as<std::wstring>().bind(parse_expression<std::wstring>(expr_str, repo));
  55         }
  56         else if (!expr_str.empty())
  57         {
  58                 var.from_string(expr_str);
  59         }
  60 }
  61
  62 spl::shared_ptr<core::frame_producer> create_xml_scene_producer(
  63                 const spl::shared_ptr<core::frame_factory>& frame_factory,
  64                 const core::video_format_desc& format_desc,
  65                 const std::vector<std::wstring>& params)
  66 {
  67         if (params.empty())
  68                 return core::frame_producer::empty();
  69
  70         std::wstring filename = env::media_folder() + L"\\" + params[0] + L".xml";
  71
  72         if (!boost::filesystem::is_regular_file(boost::filesystem::path(filename)))
  73                 return core::frame_producer::empty();
  74
  75         boost::property_tree::wptree root;
  76         std::wifstream file(filename);
  77         boost::property_tree::read_xml(
  78                         file,
  79                         root,
  80                         boost::property_tree::xml_parser::trim_whitespace
  81                                         | boost::property_tree::xml_parser::no_comments);
  82
  83         int width = root.get<int>(L"scene.<xmlattr>.width");
  84         int height = root.get<int>(L"scene.<xmlattr>.height");
  85
  86         auto scene = spl::make_shared<scene_producer>(width, height);
  87
  88         for (auto elem : root.get_child(L"scene.variables"))
  89         {
  90                 auto type = elem.second.get<std::wstring>(L"<xmlattr>.type");
  91                 auto id = elem.second.get<std::wstring>(L"<xmlattr>.id");
  92                 auto is_public = elem.second.get(L"<xmlattr>.public", false);
  93                 auto expr = elem.second.get_value<std::wstring>();
  94
  95                 if (!is_public)
  96                         id = L"variable." + id;
  97
  98                 if (type == L"number")
  99                         scene->create_variable<double>(id, is_public, expr);
 100                 else if (type == L"string")
 101                         scene->create_variable<std::wstring>(id, is_public, expr);
 102                 else if (type == L"bool")
 103                         scene->create_variable<bool>(id, is_public, expr);
 104         }
 105
 106         for (auto& elem : root.get_child(L"scene.layers"))
 107         {
 108                 auto id = elem.second.get<std::wstring>(L"<xmlattr>.id");
 109                 auto producer = create_producer(frame_factory, format_desc, elem.second.get<std::wstring>(L"producer"));
 110                 auto& layer = scene->create_layer(producer, 0, 0, id);
 111                 auto variable_prefix = L"layer." + id + L".";
 112
 113                 layer.hidden = scene->create_variable<bool>(variable_prefix + L"hidden", false, elem.second.get(L"hidden", L"false"));
 114                 layer.position.x = scene->create_variable<double>(variable_prefix + L"x", false, elem.second.get<std::wstring>(L"x"));
 115                 layer.position.y = scene->create_variable<double>(variable_prefix + L"y", false, elem.second.get<std::wstring>(L"y"));
 116
 117                 layer.adjustments.opacity = scene->create_variable<double>(variable_prefix + L"adjustment.opacity", false, elem.second.get(L"adjustments.opacity", L"1.0"));
 118
 119                 scene->create_variable<double>(variable_prefix + L"width", false) = layer.producer.get()->pixel_constraints().width;
 120                 scene->create_variable<double>(variable_prefix + L"height", false) = layer.producer.get()->pixel_constraints().height;
 121
 122                 for (auto& var_name : producer->get_variables())
 123                 {
 124                         auto& var = producer->get_variable(var_name);
 125                         auto expr = elem.second.get<std::wstring>(L"parameters." + var_name, L"");
 126
 127                         if (var.is<double>())
 128                                 scene->create_variable<double>(variable_prefix + L"parameter." + var_name, false, expr) = var.as<double>();
 129                         else if (var.is<std::wstring>())
 130                                 scene->create_variable<std::wstring>(variable_prefix + L"parameter." + var_name, false, expr) = var.as<std::wstring>();
 131                         else if (var.is<bool>())
 132                                 scene->create_variable<bool>(variable_prefix + L"parameter." + var_name, false, expr) = var.as<bool>();
 133                 }
 134         }
 135
 136         for (auto& elem : root.get_child(L"scene.timelines"))
 137         {
 138                 auto& variable = scene->get_variable(elem.second.get<std::wstring>(L"<xmlattr>.variable"));
 139
 140                 for (auto& k : elem.second)
 141                 {
 142                         if (k.first == L"<xmlattr>")
 143                                 continue;
 144
 145                         auto easing = k.second.get(L"<xmlattr>.easing", L"");
 146                         auto at = k.second.get<int64_t>(L"<xmlattr>.at");
 147
 148                         if (variable.is<double>())
 149                                 scene->add_keyframe(variable.as<double>(), k.second.get_value<double>(), at, easing);
 150                         else if (variable.is<int>())
 151                                 scene->add_keyframe(variable.as<int>(), k.second.get_value<int>(), at, easing);
 152                 }
 153         }
 154
 155         auto repo = [&scene](const std::wstring& name) -> variable&
 156         {
 157                 return scene->get_variable(name);
 158         };
 159
 160         for (auto& var_name : scene->get_variables())
 161         {
 162                 deduce_expression(scene->get_variable(var_name), repo);
 163         }
 164
 165         auto params2 = params;
 166         params2.erase(params2.begin());
 167
 168         scene->call(params2);
 169
 170         return scene;
 171 }
 172
 173 }}}