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/filesystem/fstream.hpp>
  29 #include <boost/property_tree/ptree.hpp>
  30 #include <boost/property_tree/xml_parser.hpp>
  31
  32 #include <common/env.h>
  33 #include <core/producer/frame_producer.h>
  34
  35 #include <future>
  36
  37 #include "scene_producer.h"
  38
  39 namespace caspar { namespace core { namespace scene {
  40
  41 void deduce_expression(variable& var, const variable_repository& repo)
  42 {
  43         auto expr_str = var.original_expr();
  44         auto trimmed = boost::trim_copy(expr_str);
  45
  46         if (boost::starts_with(trimmed, L"${") && boost::ends_with(trimmed, L"}"))
  47         {
  48                 expr_str = trimmed.substr(2, expr_str.length() - 3);
  49
  50                 if (var.is<double>())
  51                         var.as<double>().bind(parse_expression<double>(expr_str, repo));
  52                 else if (var.is<bool>())
  53                         var.as<bool>().bind(parse_expression<bool>(expr_str, repo));
  54                 else if (var.is<std::wstring>())
  55                         var.as<std::wstring>().bind(parse_expression<std::wstring>(expr_str, repo));
  56         }
  57         else if (!expr_str.empty())
  58         {
  59                 var.from_string(expr_str);
  60         }
  61 }
  62
  63 spl::shared_ptr<core::frame_producer> create_xml_scene_producer(
  64                 const spl::shared_ptr<core::frame_factory>& frame_factory,
  65                 const core::video_format_desc& format_desc,
  66                 const std::vector<std::wstring>& params)
  67 {
  68         if (params.empty())
  69                 return core::frame_producer::empty();
  70
  71         std::wstring filename = env::media_folder() + L"/" + params[0] + L".xml";
  72
  73         if (!boost::filesystem::is_regular_file(boost::filesystem::path(filename)))
  74                 return core::frame_producer::empty();
  75
  76         boost::property_tree::wptree root;
  77         boost::filesystem::wifstream file(filename);
  78         boost::property_tree::read_xml(
  79                         file,
  80                         root,
  81                         boost::property_tree::xml_parser::trim_whitespace
  82                                         | boost::property_tree::xml_parser::no_comments);
  83
  84         int width = root.get<int>(L"scene.<xmlattr>.width");
  85         int height = root.get<int>(L"scene.<xmlattr>.height");
  86
  87         auto scene = spl::make_shared<scene_producer>(width, height);
  88
  89         for (auto elem : root.get_child(L"scene.variables"))
  90         {
  91                 auto type = elem.second.get<std::wstring>(L"<xmlattr>.type");
  92                 auto id = elem.second.get<std::wstring>(L"<xmlattr>.id");
  93                 auto is_public = elem.second.get(L"<xmlattr>.public", false);
  94                 auto expr = elem.second.get_value<std::wstring>();
  95
  96                 if (!is_public)
  97                         id = L"variable." + id;
  98
  99                 if (type == L"number")
 100                         scene->create_variable<double>(id, is_public, expr);
 101                 else if (type == L"string")
 102                         scene->create_variable<std::wstring>(id, is_public, expr);
 103                 else if (type == L"bool")
 104                         scene->create_variable<bool>(id, is_public, expr);
 105         }
 106
 107         for (auto& elem : root.get_child(L"scene.layers"))
 108         {
 109                 auto id = elem.second.get<std::wstring>(L"<xmlattr>.id");
 110                 auto producer = create_producer(frame_factory, format_desc, elem.second.get<std::wstring>(L"producer"));
 111                 auto& layer = scene->create_layer(producer, 0, 0, id);
 112                 auto variable_prefix = L"layer." + id + L".";
 113
 114                 layer.hidden = scene->create_variable<bool>(variable_prefix + L"hidden", false, elem.second.get(L"hidden", L"false"));
 115                 layer.position.x = scene->create_variable<double>(variable_prefix + L"x", false, elem.second.get<std::wstring>(L"x"));
 116                 layer.position.y = scene->create_variable<double>(variable_prefix + L"y", false, elem.second.get<std::wstring>(L"y"));
 117
 118                 layer.adjustments.opacity = scene->create_variable<double>(variable_prefix + L"adjustment.opacity", false, elem.second.get(L"adjustments.opacity", L"1.0"));
 119
 120                 scene->create_variable<double>(variable_prefix + L"width", false) = layer.producer.get()->pixel_constraints().width;
 121                 scene->create_variable<double>(variable_prefix + L"height", false) = layer.producer.get()->pixel_constraints().height;
 122
 123                 for (auto& var_name : producer->get_variables())
 124                 {
 125                         auto& var = producer->get_variable(var_name);
 126                         auto expr = elem.second.get<std::wstring>(L"parameters." + var_name, L"");
 127
 128                         if (var.is<double>())
 129                                 scene->create_variable<double>(variable_prefix + L"parameter." + var_name, false, expr) = var.as<double>();
 130                         else if (var.is<std::wstring>())
 131                                 scene->create_variable<std::wstring>(variable_prefix + L"parameter." + var_name, false, expr) = var.as<std::wstring>();
 132                         else if (var.is<bool>())
 133                                 scene->create_variable<bool>(variable_prefix + L"parameter." + var_name, false, expr) = var.as<bool>();
 134                 }
 135         }
 136
 137         for (auto& elem : root.get_child(L"scene.timelines"))
 138         {
 139                 auto& variable = scene->get_variable(elem.second.get<std::wstring>(L"<xmlattr>.variable"));
 140
 141                 for (auto& k : elem.second)
 142                 {
 143                         if (k.first == L"<xmlattr>")
 144                                 continue;
 145
 146                         auto easing = k.second.get(L"<xmlattr>.easing", L"");
 147                         auto at = k.second.get<int64_t>(L"<xmlattr>.at");
 148
 149                         if (variable.is<double>())
 150                                 scene->add_keyframe(variable.as<double>(), k.second.get_value<double>(), at, easing);
 151                         else if (variable.is<int>())
 152                                 scene->add_keyframe(variable.as<int>(), k.second.get_value<int>(), at, easing);
 153                 }
 154         }
 155
 156         auto repo = [&scene](const std::wstring& name) -> variable&
 157         {
 158                 return scene->get_variable(name);
 159         };
 160
 161         for (auto& var_name : scene->get_variables())
 162         {
 163                 deduce_expression(scene->get_variable(var_name), repo);
 164         }
 165
 166         auto params2 = params;
 167         params2.erase(params2.begin());
 168
 169         scene->call(params2);
 170
 171         return scene;
 172 }
 173
 174 }}}