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

   1 /*\r
   2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 *  This file is part of CasparCG.\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 */\r
  20 \r
  21 #include "../StdAfx.h"\r
  22 \r
  23 #include "frame_producer.h"\r
  24 #include "frame/basic_frame.h"\r
  25 #include "frame/frame_transform.h"\r
  26 \r
  27 #include "color/color_producer.h"\r
  28 #include "playlist/playlist_producer.h"\r
  29 #include "separated/separated_producer.h"\r
  30 \r
  31 #include <common/memory/safe_ptr.h>\r
  32 #include <common/concurrency/executor.h>\r
  33 #include <common/exception/exceptions.h>\r
  34 #include <common/utility/move_on_copy.h>\r
  35 \r
  36 namespace caspar { namespace core {\r
  37         \r
  38 std::vector<const producer_factory_t> g_factories;\r
  39         \r
  40 class destroy_producer_proxy : public frame_producer\r
  41 {       \r
  42         std::shared_ptr<frame_producer>* producer_;\r
  43 public:\r
  44         destroy_producer_proxy(safe_ptr<frame_producer>&& producer) \r
  45                 : producer_(new std::shared_ptr<frame_producer>(std::move(producer)))\r
  46         {\r
  47         }\r
  48 \r
  49         ~destroy_producer_proxy()\r
  50         {               \r
  51                 static auto destroyers = std::make_shared<tbb::concurrent_bounded_queue<std::shared_ptr<executor>>>();\r
  52                 static tbb::atomic<int> destroyer_count;\r
  53 \r
  54                 try\r
  55                 {\r
  56                         std::shared_ptr<executor> destroyer;\r
  57                         if(!destroyers->try_pop(destroyer))\r
  58                         {\r
  59                                 destroyer.reset(new executor(L"destroyer"));\r
  60                                 destroyer->set_priority_class(below_normal_priority_class);\r
  61                                 if(++destroyer_count > 16)\r
  62                                         CASPAR_LOG(warning) << L"Potential destroyer dead-lock detected.";\r
  63                                 CASPAR_LOG(trace) << "Created destroyer: " << destroyer_count;\r
  64                         }\r
  65                                 \r
  66                         auto producer = producer_;\r
  67                         auto pool         = destroyers;\r
  68                         destroyer->begin_invoke([=]\r
  69                         {\r
  70                                 try\r
  71                                 {\r
  72                                         if(!producer->unique())\r
  73                                                 CASPAR_LOG(trace) << (*producer)->print() << L" Not destroyed on safe asynchronous destruction thread: " << producer->use_count();\r
  74                                         else\r
  75                                                 CASPAR_LOG(trace) << (*producer)->print() << L" Destroying on safe asynchronous destruction thread.";\r
  76                                 }\r
  77                                 catch(...){}\r
  78 \r
  79                                 delete producer;\r
  80                                 pool->push(destroyer);\r
  81                         }); \r
  82                 }\r
  83                 catch(...)\r
  84                 {\r
  85                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  86                         try\r
  87                         {\r
  88                                 delete producer_;\r
  89                         }\r
  90                         catch(...){}\r
  91                 }\r
  92         }\r
  93 \r
  94         virtual safe_ptr<basic_frame>           receive(int hints)                                                                                              {return (*producer_)->receive(hints);}\r
  95         virtual safe_ptr<basic_frame>           last_frame() const                                                                                              {return (*producer_)->last_frame();}\r
  96         virtual std::wstring                            print() const                                                                                                   {return (*producer_)->print();}\r
  97         virtual std::wstring                            param(const std::wstring& str)                                                                  {return (*producer_)->param(str);}\r
  98         virtual safe_ptr<frame_producer>        get_following_producer() const                                                                  {return (*producer_)->get_following_producer();}\r
  99         virtual void                                            set_leading_producer(const safe_ptr<frame_producer>& producer)  {(*producer_)->set_leading_producer(producer);}\r
 100         virtual int64_t                                         nb_frames() const                                                                                               {return (*producer_)->nb_frames();}\r
 101 };\r
 102 \r
 103 safe_ptr<core::frame_producer> create_destroy_proxy(safe_ptr<core::frame_producer>&& producer)\r
 104 {\r
 105         return make_safe<destroy_producer_proxy>(std::move(producer));\r
 106 }\r
 107 \r
 108 class last_frame_producer : public frame_producer\r
 109 {\r
 110         const std::wstring                      print_;\r
 111         const safe_ptr<basic_frame>     frame_;\r
 112         const int64_t                           nb_frames_;\r
 113 public:\r
 114         last_frame_producer(const safe_ptr<frame_producer>& producer) \r
 115                 : print_(producer->print())\r
 116                 , frame_(producer->last_frame() != basic_frame::eof() ? producer->last_frame() : basic_frame::empty())\r
 117                 , nb_frames_(producer->nb_frames())\r
 118         {\r
 119         }\r
 120         \r
 121         virtual safe_ptr<basic_frame> receive(int){return frame_;}\r
 122         virtual safe_ptr<core::basic_frame> last_frame() const{return frame_;}\r
 123         virtual std::wstring print() const{return L"dummy[" + print_ + L"]";}\r
 124         virtual int64_t nb_frames() const {return nb_frames_;}  \r
 125 };\r
 126 \r
 127 struct empty_frame_producer : public frame_producer\r
 128 {\r
 129         virtual safe_ptr<basic_frame> receive(int){return basic_frame::empty();}\r
 130         virtual safe_ptr<basic_frame> last_frame() const{return basic_frame::empty();}\r
 131         virtual void set_frame_factory(const safe_ptr<frame_factory>&){}\r
 132         virtual int64_t nb_frames() const {return 0;}\r
 133         virtual std::wstring print() const { return L"empty";}\r
 134 };\r
 135 \r
 136 const safe_ptr<frame_producer>& frame_producer::empty() // nothrow\r
 137 {\r
 138         static safe_ptr<frame_producer> producer = make_safe<empty_frame_producer>();\r
 139         return producer;\r
 140 }       \r
 141 \r
 142 safe_ptr<basic_frame> receive_and_follow(safe_ptr<frame_producer>& producer, int hints)\r
 143 {       \r
 144         auto frame = producer->receive(hints);\r
 145         if(frame == basic_frame::eof())\r
 146         {\r
 147                 CASPAR_LOG(info) << producer->print() << " End Of File.";\r
 148                 auto following = producer->get_following_producer();\r
 149                 if(following != frame_producer::empty())\r
 150                 {\r
 151                         following->set_leading_producer(producer);\r
 152                         producer = std::move(following);\r
 153                 }\r
 154                 else\r
 155                         producer = make_safe<last_frame_producer>(producer);\r
 156 \r
 157                 return receive_and_follow(producer, hints);\r
 158         }\r
 159         return frame;\r
 160 }\r
 161 \r
 162 void register_producer_factory(const producer_factory_t& factory)\r
 163 {\r
 164         g_factories.push_back(factory);\r
 165 }\r
 166 \r
 167 safe_ptr<core::frame_producer> do_create_producer(const safe_ptr<frame_factory>& my_frame_factory, const std::vector<std::wstring>& params)\r
 168 {\r
 169         if(params.empty())\r
 170                 BOOST_THROW_EXCEPTION(invalid_argument() << arg_name_info("params") << arg_value_info(""));\r
 171         \r
 172         auto producer = frame_producer::empty();\r
 173         std::any_of(g_factories.begin(), g_factories.end(), [&](const producer_factory_t& factory) -> bool\r
 174                 {\r
 175                         try\r
 176                         {\r
 177                                 producer = factory(my_frame_factory, params);\r
 178                         }\r
 179                         catch(...)\r
 180                         {\r
 181                                 CASPAR_LOG_CURRENT_EXCEPTION();\r
 182                         }\r
 183                         return producer != frame_producer::empty();\r
 184                 });\r
 185 \r
 186         if(producer == frame_producer::empty())\r
 187                 producer = create_color_producer(my_frame_factory, params);\r
 188         \r
 189         if(producer == frame_producer::empty())\r
 190                 producer = create_playlist_producer(my_frame_factory, params);\r
 191 \r
 192         return producer;\r
 193 }\r
 194 \r
 195 \r
 196 safe_ptr<core::frame_producer> create_producer(const safe_ptr<frame_factory>& my_frame_factory, const std::vector<std::wstring>& params)\r
 197 {       \r
 198         auto producer = do_create_producer(my_frame_factory, params);\r
 199         auto key_producer = frame_producer::empty();\r
 200         \r
 201         try // to find a key file.\r
 202         {\r
 203                 auto params_copy = params;\r
 204                 if(params_copy.size() > 0)\r
 205                 {\r
 206                         params_copy[0] += L"_A";\r
 207                         key_producer = do_create_producer(my_frame_factory, params_copy);                       \r
 208                         if(key_producer == frame_producer::empty())\r
 209                         {\r
 210                                 params_copy[0] += L"LPHA";\r
 211                                 key_producer = do_create_producer(my_frame_factory, params_copy);       \r
 212                         }\r
 213                 }\r
 214         }\r
 215         catch(...){}\r
 216 \r
 217         if(producer != frame_producer::empty() && key_producer != frame_producer::empty())\r
 218                 return create_separated_producer(producer, key_producer);\r
 219         \r
 220         if(producer == frame_producer::empty())\r
 221         {\r
 222                 std::wstring str;\r
 223                 BOOST_FOREACH(auto& param, params)\r
 224                         str += param + L" ";\r
 225                 BOOST_THROW_EXCEPTION(file_not_found() << msg_info("No match found for supplied commands. Check syntax.") << arg_value_info(narrow(str)));\r
 226         }\r
 227 \r
 228         return producer;\r
 229 }\r
 230 \r
 231 \r
 232 safe_ptr<core::frame_producer> create_producer(const safe_ptr<frame_factory>& factory, const std::wstring& params)\r
 233 {\r
 234         std::wstringstream iss(params);\r
 235         std::vector<std::wstring> tokens;\r
 236         typedef std::istream_iterator<std::wstring, wchar_t, std::char_traits<wchar_t> > iterator;\r
 237         std::copy(iterator(iss),  iterator(), std::back_inserter(tokens));\r
 238         return create_producer(factory, tokens);\r
 239 }\r
 240 \r
 241 }}