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

   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 #pragma once\r
  21 \r
  22 #include <common/memory/safe_ptr.h>\r
  23 \r
  24 #include <boost/noncopyable.hpp>\r
  25 \r
  26 #include <algorithm>\r
  27 #include <functional>\r
  28 #include <string>\r
  29 #include <vector>\r
  30 #include <stdint.h>\r
  31 #include <numeric>\r
  32 \r
  33 #include <boost/thread/future.hpp>\r
  34 \r
  35 namespace caspar { \r
  36         \r
  37 class executor;\r
  38         \r
  39 namespace core {\r
  40 \r
  41 class basic_frame;\r
  42 struct frame_factory;\r
  43 \r
  44 struct frame_producer : boost::noncopyable\r
  45 {\r
  46 public:\r
  47         enum hints\r
  48         {\r
  49                 NO_HINT = 0,\r
  50                 ALPHA_HINT = 1\r
  51         };\r
  52 \r
  53         virtual ~frame_producer(){}     \r
  54 \r
  55         virtual std::wstring print() const = 0; // nothrow\r
  56 \r
  57         virtual boost::unique_future<std::wstring> call(const std::wstring&) \r
  58         {\r
  59                 boost::promise<std::wstring> promise;\r
  60                 promise.set_value(L"");\r
  61                 return promise.get_future();\r
  62         }\r
  63 \r
  64         virtual safe_ptr<frame_producer> get_following_producer() const {return frame_producer::empty();}  // nothrow\r
  65         virtual void set_leading_producer(const safe_ptr<frame_producer>&) {}  // nothrow\r
  66                 \r
  67         virtual int64_t nb_frames() const {return std::numeric_limits<int>::max();}\r
  68         virtual int64_t file_nb_frames() const {return nb_frames();}\r
  69 \r
  70         virtual int64_t frame_number() const {return 0;}\r
  71         virtual int64_t file_frame_number() const {return frame_number();}\r
  72         \r
  73         virtual safe_ptr<basic_frame> receive(int hints) = 0;\r
  74         virtual safe_ptr<core::basic_frame> last_frame() const = 0;\r
  75 \r
  76         static const safe_ptr<frame_producer>& empty(); // nothrow\r
  77 };\r
  78 \r
  79 safe_ptr<basic_frame> receive_and_follow(safe_ptr<frame_producer>& producer, int hints);\r
  80 \r
  81 typedef std::function<safe_ptr<core::frame_producer>(const safe_ptr<frame_factory>&, const std::vector<std::wstring>&)> producer_factory_t;\r
  82 void register_producer_factory(const producer_factory_t& factory); // Not thread-safe.\r
  83 safe_ptr<core::frame_producer> create_producer(const safe_ptr<frame_factory>&, const std::vector<std::wstring>& params);\r
  84 safe_ptr<core::frame_producer> create_producer(const safe_ptr<frame_factory>&, const std::wstring& params);\r
  85 safe_ptr<core::frame_producer> create_producer_destroy_proxy(safe_ptr<core::frame_producer>&& producer);\r
  86 \r
  87 template<typename T>\r
  88 typename std::decay<T>::type get_param(const std::wstring& name, const std::vector<std::wstring>& params, T fail_value)\r
  89 {       \r
  90         auto it = std::find(params.begin(), params.end(), name);\r
  91         if(it == params.end() || ++it == params.end())  \r
  92                 return fail_value;\r
  93         \r
  94         T value = fail_value;\r
  95         try\r
  96         {\r
  97                 value = boost::lexical_cast<std::decay<T>::type>(*it);\r
  98         }\r
  99         catch(boost::bad_lexical_cast&){}\r
 100 \r
 101         return value;\r
 102 }\r
 103 \r
 104 }}\r