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/audio_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/exception/exceptions.h>\r
  32 \r
  33 namespace caspar { namespace core {\r
  34         \r
  35 std::vector<const producer_factory_t> g_factories;\r
  36 \r
  37 const safe_ptr<frame_producer>& frame_producer::empty() // nothrow\r
  38 {\r
  39         struct empty_frame_producer : public frame_producer\r
  40         {\r
  41                 virtual safe_ptr<basic_frame> receive(int){return basic_frame::empty();}\r
  42                 virtual safe_ptr<basic_frame> last_frame() const{return basic_frame::empty();}\r
  43                 virtual void set_frame_factory(const safe_ptr<frame_factory>&){}\r
  44                 virtual int64_t nb_frames() const {return 0;}\r
  45                 virtual std::wstring print() const { return L"empty";}\r
  46         };\r
  47         static safe_ptr<frame_producer> producer = make_safe<empty_frame_producer>();\r
  48         return producer;\r
  49 }       \r
  50 \r
  51 safe_ptr<basic_frame> receive_and_follow(safe_ptr<frame_producer>& producer, int hints)\r
  52 {       \r
  53         if(producer == frame_producer::empty())\r
  54                 return basic_frame::eof();\r
  55 \r
  56         auto frame = basic_frame::eof();\r
  57         try\r
  58         {\r
  59                 frame = producer->receive(hints);\r
  60         }\r
  61         catch(...)\r
  62         {\r
  63                 try\r
  64                 {\r
  65                         // Producer will be removed since frame == basic_frame::eof.\r
  66                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  67                         CASPAR_LOG(warning) << producer->print() << " Failed to receive frame. Removing producer.";\r
  68                 }\r
  69                 catch(...){}\r
  70         }\r
  71 \r
  72         if(frame == basic_frame::eof())\r
  73         {\r
  74                 CASPAR_LOG(info) << producer->print() << " End Of File.";\r
  75                 auto following = producer->get_following_producer();\r
  76                 following->set_leading_producer(producer);\r
  77                 producer = std::move(following);                \r
  78                 \r
  79                 return receive_and_follow(producer, hints);\r
  80         }\r
  81         return frame;\r
  82 }\r
  83 \r
  84 void register_producer_factory(const producer_factory_t& factory)\r
  85 {\r
  86         g_factories.push_back(factory);\r
  87 }\r
  88 \r
  89 safe_ptr<core::frame_producer> do_create_producer(const safe_ptr<frame_factory>& my_frame_factory, const std::vector<std::wstring>& params)\r
  90 {\r
  91         if(params.empty())\r
  92                 BOOST_THROW_EXCEPTION(invalid_argument() << arg_name_info("params") << arg_value_info(""));\r
  93         \r
  94         auto producer = frame_producer::empty();\r
  95         std::any_of(g_factories.begin(), g_factories.end(), [&](const producer_factory_t& factory) -> bool\r
  96                 {\r
  97                         try\r
  98                         {\r
  99                                 producer = factory(my_frame_factory, params);\r
 100                         }\r
 101                         catch(...)\r
 102                         {\r
 103                                 CASPAR_LOG_CURRENT_EXCEPTION();\r
 104                         }\r
 105                         return producer != frame_producer::empty();\r
 106                 });\r
 107 \r
 108         if(producer == frame_producer::empty())\r
 109                 producer = create_color_producer(my_frame_factory, params);\r
 110 \r
 111         if(producer == frame_producer::empty())\r
 112                 BOOST_THROW_EXCEPTION(file_not_found() << msg_info("No match found for supplied commands. Check syntax.") << arg_value_info(params.size() > 0 ? narrow(params[0]) : ""));\r
 113 \r
 114         return producer;\r
 115 }\r
 116 \r
 117 \r
 118 safe_ptr<core::frame_producer> create_producer(const safe_ptr<frame_factory>& my_frame_factory, const std::vector<std::wstring>& params)\r
 119 {       \r
 120         auto producer = do_create_producer(my_frame_factory, params);\r
 121         auto key_producer = frame_producer::empty();\r
 122         \r
 123         try // to find a key file.\r
 124         {\r
 125                 auto params_copy = params;\r
 126                 if(params_copy.size() > 0)\r
 127                 {\r
 128                         params_copy[0] += L"_A";\r
 129                         key_producer = do_create_producer(my_frame_factory, params_copy);                       \r
 130                 }\r
 131         }\r
 132         catch(...){}\r
 133 \r
 134         if(key_producer != frame_producer::empty())\r
 135                 return create_separated_producer(producer, key_producer);\r
 136 \r
 137         return producer;\r
 138 }\r
 139 \r
 140 }}