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 "separated/separated_producer.h"\r
  29 \r
  30 #include <common/memory/safe_ptr.h>\r
  31 #include <common/concurrency/executor.h>\r
  32 #include <common/exception/exceptions.h>\r
  33 #include <common/utility/move_on_copy.h>\r
  34 \r
  35 namespace caspar { namespace core {\r
  36         \r
  37 std::vector<const producer_factory_t> g_factories;\r
  38         \r
  39 class destroy_producer_proxy : public frame_producer\r
  40 {\r
  41         safe_ptr<frame_producer> producer_;\r
  42         executor& destroy_context_;\r
  43 public:\r
  44         destroy_producer_proxy(executor& destroy_context, const safe_ptr<frame_producer>& producer) \r
  45                 : producer_(producer)\r
  46                 , destroy_context_(destroy_context){}\r
  47 \r
  48         ~destroy_producer_proxy()\r
  49         {               \r
  50                 if(destroy_context_.size() > 4)\r
  51                         CASPAR_LOG(error) << L" Potential destroyer deadlock.";\r
  52 \r
  53                 // Hacks to bypass compiler bugs.\r
  54                 auto mov_producer = make_move_on_copy<safe_ptr<frame_producer>>(std::move(producer_));\r
  55                 auto empty_producer = frame_producer::empty();\r
  56                 destroy_context_.begin_invoke([=]\r
  57                 {                       \r
  58                         if(!mov_producer.value.unique())\r
  59                                 CASPAR_LOG(debug) << mov_producer.value->print() << L" Not destroyed on safe asynchronous destruction thread.";\r
  60                         else\r
  61                                 CASPAR_LOG(debug) << mov_producer.value->print() << L" Destroying on safe asynchronous destruction thread.";\r
  62         \r
  63                         mov_producer.value = empty_producer;\r
  64                 });\r
  65         }\r
  66 \r
  67         virtual safe_ptr<basic_frame>           receive(int hints)                                                                                              {return producer_->receive(hints);}\r
  68         virtual safe_ptr<basic_frame>           last_frame() const                                                                                              {return producer_->last_frame();}\r
  69         virtual std::wstring                            print() const                                                                                                   {return producer_->print();}\r
  70         virtual void                                            param(const std::wstring& str)                                                                  {producer_->param(str);}\r
  71         virtual safe_ptr<frame_producer>        get_following_producer() const                                                                  {return producer_->get_following_producer();}\r
  72         virtual void                                            set_leading_producer(const safe_ptr<frame_producer>& producer)  {producer_->set_leading_producer(producer);}\r
  73         virtual int64_t                                         nb_frames() const                                                                                               {return producer_->nb_frames();}\r
  74 };\r
  75 \r
  76 safe_ptr<core::frame_producer> create_destroy_producer_proxy(executor& destroy_context, const safe_ptr<frame_producer>& producer)\r
  77 {\r
  78         return make_safe<destroy_producer_proxy>(destroy_context, producer);\r
  79 }\r
  80 \r
  81 class last_frame_producer : public frame_producer\r
  82 {\r
  83         const std::wstring                      print_;\r
  84         const safe_ptr<basic_frame>     frame_;\r
  85         const int64_t                           nb_frames_;\r
  86 public:\r
  87         last_frame_producer(const safe_ptr<frame_producer>& producer) \r
  88                 : print_(producer->print())\r
  89                 , frame_(producer->last_frame() != basic_frame::eof() ? producer->last_frame() : basic_frame::empty())\r
  90                 , nb_frames_(producer->nb_frames())\r
  91         {\r
  92         }\r
  93         \r
  94         virtual safe_ptr<basic_frame> receive(int){return frame_;}\r
  95         virtual safe_ptr<core::basic_frame> last_frame() const{return frame_;}\r
  96         virtual std::wstring print() const{return L"dummy[" + print_ + L"]";}\r
  97         virtual int64_t nb_frames() const {return nb_frames_;}  \r
  98 };\r
  99 \r
 100 struct empty_frame_producer : public frame_producer\r
 101 {\r
 102         virtual safe_ptr<basic_frame> receive(int){return basic_frame::empty();}\r
 103         virtual safe_ptr<basic_frame> last_frame() const{return basic_frame::empty();}\r
 104         virtual void set_frame_factory(const safe_ptr<frame_factory>&){}\r
 105         virtual int64_t nb_frames() const {return 0;}\r
 106         virtual std::wstring print() const { return L"empty";}\r
 107 };\r
 108 \r
 109 const safe_ptr<frame_producer>& frame_producer::empty() // nothrow\r
 110 {\r
 111         static safe_ptr<frame_producer> producer = make_safe<empty_frame_producer>();\r
 112         return producer;\r
 113 }       \r
 114 \r
 115 safe_ptr<basic_frame> receive_and_follow(safe_ptr<frame_producer>& producer, int hints)\r
 116 {       \r
 117         auto frame = producer->receive(hints);\r
 118         if(frame == basic_frame::eof())\r
 119         {\r
 120                 CASPAR_LOG(info) << producer->print() << " End Of File.";\r
 121                 auto following = producer->get_following_producer();\r
 122                 if(following != frame_producer::empty())\r
 123                 {\r
 124                         following->set_leading_producer(producer);\r
 125                         producer = std::move(following);\r
 126                 }\r
 127                 else\r
 128                         producer = make_safe<last_frame_producer>(producer);\r
 129 \r
 130                 return receive_and_follow(producer, hints);\r
 131         }\r
 132         return frame;\r
 133 }\r
 134 \r
 135 void register_producer_factory(const producer_factory_t& factory)\r
 136 {\r
 137         g_factories.push_back(factory);\r
 138 }\r
 139 \r
 140 safe_ptr<core::frame_producer> do_create_producer(const safe_ptr<frame_factory>& my_frame_factory, const std::vector<std::wstring>& params)\r
 141 {\r
 142         if(params.empty())\r
 143                 BOOST_THROW_EXCEPTION(invalid_argument() << arg_name_info("params") << arg_value_info(""));\r
 144         \r
 145         auto producer = frame_producer::empty();\r
 146         std::any_of(g_factories.begin(), g_factories.end(), [&](const producer_factory_t& factory) -> bool\r
 147                 {\r
 148                         try\r
 149                         {\r
 150                                 producer = factory(my_frame_factory, params);\r
 151                         }\r
 152                         catch(...)\r
 153                         {\r
 154                                 CASPAR_LOG_CURRENT_EXCEPTION();\r
 155                         }\r
 156                         return producer != frame_producer::empty();\r
 157                 });\r
 158 \r
 159         if(producer == frame_producer::empty())\r
 160                 producer = create_color_producer(my_frame_factory, params);\r
 161         \r
 162         return producer;\r
 163 }\r
 164 \r
 165 \r
 166 safe_ptr<core::frame_producer> create_producer(const safe_ptr<frame_factory>& my_frame_factory, const std::vector<std::wstring>& params)\r
 167 {       \r
 168         auto producer = do_create_producer(my_frame_factory, params);\r
 169         auto key_producer = frame_producer::empty();\r
 170         \r
 171         try // to find a key file.\r
 172         {\r
 173                 auto params_copy = params;\r
 174                 if(params_copy.size() > 0)\r
 175                 {\r
 176                         params_copy[0] += L"_A";\r
 177                         key_producer = do_create_producer(my_frame_factory, params_copy);                       \r
 178                         if(key_producer == frame_producer::empty())\r
 179                         {\r
 180                                 params_copy[0] += L"LPHA";\r
 181                                 key_producer = do_create_producer(my_frame_factory, params_copy);       \r
 182                         }\r
 183                 }\r
 184         }\r
 185         catch(...){}\r
 186 \r
 187         if(producer != frame_producer::empty() && key_producer != frame_producer::empty())\r
 188                 producer = create_separated_producer(producer, key_producer);\r
 189         \r
 190         if(producer == frame_producer::empty())\r
 191         {\r
 192                 std::wstring str;\r
 193                 BOOST_FOREACH(auto& param, params)\r
 194                         str += param + L" ";\r
 195                 BOOST_THROW_EXCEPTION(file_not_found() << msg_info("No match found for supplied commands. Check syntax.") << arg_value_info(narrow(str)));\r
 196         }\r
 197 \r
 198         return producer;\r
 199 }\r
 200 \r
 201 }}