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

   1 /*\r
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 * This file is part of CasparCG (www.casparcg.com).\r
   5 *\r
   6 * CasparCG is free software: you can redistribute it and/or modify\r
   7 * it under the terms of the GNU General Public License as published by\r
   8 * the Free Software Foundation, either version 3 of the License, or\r
   9 * (at your option) any later version.\r
  10 *\r
  11 * CasparCG is distributed in the hope that it will be useful,\r
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14 * GNU General Public License for more details.\r
  15 *\r
  16 * You should have received a copy of the GNU General Public License\r
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.\r
  18 *\r
  19 * Author: Robert Nagy, ronag89@gmail.com\r
  20 */\r
  21 \r
  22 #include "../StdAfx.h"\r
  23 \r
  24 #include "frame_producer.h"\r
  25 #include "frame/basic_frame.h"\r
  26 #include "frame/frame_transform.h"\r
  27 \r
  28 #include "color/color_producer.h"\r
  29 #include "playlist/playlist_producer.h"\r
  30 #include "separated/separated_producer.h"\r
  31 \r
  32 #include <common/memory/safe_ptr.h>\r
  33 #include <common/concurrency/executor.h>\r
  34 #include <common/exception/exceptions.h>\r
  35 #include <common/utility/move_on_copy.h>\r
  36 \r
  37 namespace caspar { namespace core {\r
  38         \r
  39 std::vector<const producer_factory_t> g_factories;\r
  40         \r
  41 class destroy_producer_proxy : public frame_producer\r
  42 {       \r
  43         std::unique_ptr<std::shared_ptr<frame_producer>> producer_;\r
  44 public:\r
  45         destroy_producer_proxy(safe_ptr<frame_producer>&& producer) \r
  46                 : producer_(new std::shared_ptr<frame_producer>(std::move(producer)))\r
  47         {\r
  48         }\r
  49 \r
  50         ~destroy_producer_proxy()\r
  51         {               \r
  52                 static auto destroyers = std::make_shared<tbb::concurrent_bounded_queue<std::shared_ptr<executor>>>();\r
  53                 static tbb::atomic<int> destroyer_count;\r
  54 \r
  55                 try\r
  56                 {\r
  57                         std::shared_ptr<executor> destroyer;\r
  58                         if(!destroyers->try_pop(destroyer))\r
  59                         {\r
  60                                 destroyer.reset(new executor(L"destroyer"));\r
  61                                 destroyer->set_priority_class(below_normal_priority_class);\r
  62                                 if(++destroyer_count > 16)\r
  63                                         CASPAR_LOG(warning) << L"Potential destroyer dead-lock detected.";\r
  64                                 CASPAR_LOG(trace) << "Created destroyer: " << destroyer_count;\r
  65                         }\r
  66                                 \r
  67                         auto producer = producer_.release();\r
  68                         auto pool         = destroyers;\r
  69                         destroyer->begin_invoke([=]\r
  70                         {\r
  71                                 std::unique_ptr<std::shared_ptr<frame_producer>> producer2(producer);\r
  72 \r
  73                                 auto str = (*producer2)->print();\r
  74                                 try\r
  75                                 {\r
  76                                         if(!producer->unique())\r
  77                                                 CASPAR_LOG(trace) << str << L" Not destroyed on safe asynchronous destruction thread: " << producer->use_count();\r
  78                                         else\r
  79                                                 CASPAR_LOG(trace) << str << L" Destroying on safe asynchronous destruction thread.";\r
  80                                 }\r
  81                                 catch(...){}\r
  82                                                                 \r
  83                                 producer2.reset();\r
  84                                 CASPAR_LOG(debug) << str << L" Destroyed.";\r
  85                                 pool->push(destroyer);\r
  86                         }); \r
  87                 }\r
  88                 catch(...)\r
  89                 {\r
  90                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  91                         try\r
  92                         {\r
  93                                 auto str = (*producer_)->print();\r
  94                                 producer_.reset();\r
  95                                 CASPAR_LOG(debug) << str << L" Destroyed.";\r
  96                         }\r
  97                         catch(...){}\r
  98                 }\r
  99         }\r
 100 \r
 101         virtual safe_ptr<basic_frame>                                                           receive(int flags) override                                                                                             {return (*producer_)->receive(flags);}\r
 102         virtual safe_ptr<basic_frame>                                                           last_frame() const override                                                                                             {return (*producer_)->last_frame();}\r
 103         virtual std::wstring                                                                            print() const override                                                                                                  {return (*producer_)->print();}\r
 104         virtual boost::property_tree::wptree                                            info() const override                                                                                                   {return (*producer_)->info();}\r
 105         virtual boost::unique_future<std::wstring>                                      call(const std::wstring& str) override                                                                  {return (*producer_)->call(str);}\r
 106         virtual safe_ptr<frame_producer>                                                        get_following_producer() const override                                                                 {return (*producer_)->get_following_producer();}\r
 107         virtual void                                                                                            set_leading_producer(const safe_ptr<frame_producer>& producer) override {(*producer_)->set_leading_producer(producer);}\r
 108         virtual uint32_t                                                                                        nb_frames() const override                                                                                              {return (*producer_)->nb_frames();}\r
 109 };\r
 110 \r
 111 safe_ptr<core::frame_producer> create_producer_destroy_proxy(safe_ptr<core::frame_producer>&& producer)\r
 112 {\r
 113         return make_safe<destroy_producer_proxy>(std::move(producer));\r
 114 }\r
 115 \r
 116 struct empty_frame_producer : public frame_producer\r
 117 {\r
 118         virtual safe_ptr<basic_frame> receive(int){return basic_frame::empty();}\r
 119         virtual safe_ptr<basic_frame> last_frame() const{return basic_frame::empty();}\r
 120         virtual void set_frame_factory(const safe_ptr<frame_factory>&){}\r
 121         virtual uint32_t nb_frames() const {return 0;}\r
 122         virtual std::wstring print() const { return L"empty";}\r
 123         \r
 124         virtual boost::property_tree::wptree info() const override\r
 125         {\r
 126                 boost::property_tree::wptree info;\r
 127                 info.add(L"type", L"empty-producer");\r
 128                 return info;\r
 129         }\r
 130 };\r
 131 \r
 132 const safe_ptr<frame_producer>& frame_producer::empty() // nothrow\r
 133 {\r
 134         static safe_ptr<frame_producer> producer = make_safe<empty_frame_producer>();\r
 135         return producer;\r
 136 }       \r
 137 \r
 138 safe_ptr<basic_frame> receive_and_follow(safe_ptr<frame_producer>& producer, int flags)\r
 139 {       \r
 140         auto frame = producer->receive(flags);\r
 141         if(frame != basic_frame::eof())\r
 142                 return frame;\r
 143                 \r
 144         CASPAR_LOG(info) << producer->print() << " End Of File.";\r
 145         auto following = producer->get_following_producer();\r
 146         following->set_leading_producer(producer);\r
 147         producer = std::move(following);\r
 148 \r
 149         return receive_and_follow(producer, flags);     \r
 150 }\r
 151 \r
 152 void register_producer_factory(const producer_factory_t& factory)\r
 153 {\r
 154         g_factories.push_back(factory);\r
 155 }\r
 156 \r
 157 safe_ptr<core::frame_producer> do_create_producer(const safe_ptr<frame_factory>& my_frame_factory, const std::vector<std::wstring>& params)\r
 158 {\r
 159         if(params.empty())\r
 160                 BOOST_THROW_EXCEPTION(invalid_argument() << arg_name_info("params") << arg_value_info(""));\r
 161         \r
 162         auto producer = frame_producer::empty();\r
 163         std::any_of(g_factories.begin(), g_factories.end(), [&](const producer_factory_t& factory) -> bool\r
 164                 {\r
 165                         try\r
 166                         {\r
 167                                 producer = factory(my_frame_factory, params);\r
 168                         }\r
 169                         catch(...)\r
 170                         {\r
 171                                 CASPAR_LOG_CURRENT_EXCEPTION();\r
 172                         }\r
 173                         return producer != frame_producer::empty();\r
 174                 });\r
 175 \r
 176         if(producer == frame_producer::empty())\r
 177                 producer = create_color_producer(my_frame_factory, params);\r
 178         \r
 179         if(producer == frame_producer::empty())\r
 180                 producer = create_playlist_producer(my_frame_factory, params);\r
 181 \r
 182         return producer;\r
 183 }\r
 184 \r
 185 \r
 186 safe_ptr<core::frame_producer> create_producer(const safe_ptr<frame_factory>& my_frame_factory, const std::vector<std::wstring>& params)\r
 187 {       \r
 188         auto producer = do_create_producer(my_frame_factory, params);\r
 189         auto key_producer = frame_producer::empty();\r
 190         \r
 191         try // to find a key file.\r
 192         {\r
 193                 auto params_copy = params;\r
 194                 if(params_copy.size() > 0)\r
 195                 {\r
 196                         params_copy[0] += L"_A";\r
 197                         key_producer = do_create_producer(my_frame_factory, params_copy);                       \r
 198                         if(key_producer == frame_producer::empty())\r
 199                         {\r
 200                                 params_copy[0] += L"LPHA";\r
 201                                 key_producer = do_create_producer(my_frame_factory, params_copy);       \r
 202                         }\r
 203                 }\r
 204         }\r
 205         catch(...){}\r
 206 \r
 207         if(producer != frame_producer::empty() && key_producer != frame_producer::empty())\r
 208                 return create_separated_producer(producer, key_producer);\r
 209         \r
 210         if(producer == frame_producer::empty())\r
 211         {\r
 212                 std::wstring str;\r
 213                 BOOST_FOREACH(auto& param, params)\r
 214                         str += param + L" ";\r
 215                 BOOST_THROW_EXCEPTION(file_not_found() << msg_info("No match found for supplied commands. Check syntax.") << warg_value_info(str));\r
 216         }\r
 217 \r
 218         return producer;\r
 219 }\r
 220 \r
 221 \r
 222 safe_ptr<core::frame_producer> create_producer(const safe_ptr<frame_factory>& factory, const std::wstring& params)\r
 223 {\r
 224         std::wstringstream iss(params);\r
 225         std::vector<std::wstring> tokens;\r
 226         typedef std::istream_iterator<std::wstring, wchar_t, std::char_traits<wchar_t> > iterator;\r
 227         std::copy(iterator(iss),  iterator(), std::back_inserter(tokens));\r
 228         return create_producer(factory, tokens);\r
 229 }\r
 230 \r
 231 }}