git.sesse.net Git - casparcg/blob - core/consumer/frame_consumer.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 #include "../StdAfx.h"\r
  21 \r
  22 #include "frame_consumer.h"\r
  23 \r
  24 #include <common/env.h>\r
  25 #include <common/memory/safe_ptr.h>\r
  26 #include <common/exception/exceptions.h>\r
  27 #include <core/video_format.h>\r
  28 #include <core/mixer/read_frame.h>\r
  29 \r
  30 #include <boost/circular_buffer.hpp>\r
  31 \r
  32 namespace caspar { namespace core {\r
  33                 \r
  34 std::vector<const consumer_factory_t> g_factories;\r
  35 \r
  36 void register_consumer_factory(const consumer_factory_t& factory)\r
  37 {\r
  38         g_factories.push_back(factory);\r
  39 }\r
  40 \r
  41 safe_ptr<core::frame_consumer> create_consumer(const std::vector<std::wstring>& params)\r
  42 {\r
  43         if(params.empty())\r
  44                 BOOST_THROW_EXCEPTION(invalid_argument() << arg_name_info("params") << arg_value_info(""));\r
  45         \r
  46         auto consumer = frame_consumer::empty();\r
  47         std::any_of(g_factories.begin(), g_factories.end(), [&](const consumer_factory_t& factory) -> bool\r
  48                 {\r
  49                         try\r
  50                         {\r
  51                                 consumer = factory(params);\r
  52                         }\r
  53                         catch(...)\r
  54                         {\r
  55                                 CASPAR_LOG_CURRENT_EXCEPTION();\r
  56                         }\r
  57                         return consumer != frame_consumer::empty();\r
  58                 });\r
  59 \r
  60         if(consumer == frame_consumer::empty())\r
  61                 BOOST_THROW_EXCEPTION(file_not_found() << msg_info("No match found for supplied commands. Check syntax."));\r
  62 \r
  63         return consumer;\r
  64 }\r
  65 \r
  66 // This class is used to guarantee that audio cadence is correct. This is important for NTSC audio.\r
  67 class cadence_guard : public frame_consumer\r
  68 {\r
  69         safe_ptr<frame_consumer>                consumer_;\r
  70         std::vector<size_t>                             audio_cadence_;\r
  71         boost::circular_buffer<size_t>  sync_buffer_;\r
  72         bool                                                    synced_;\r
  73 public:\r
  74         cadence_guard(safe_ptr<frame_consumer>&& consumer)\r
  75                 : consumer_(std::move(consumer))\r
  76         {\r
  77         }\r
  78         \r
  79         virtual void initialize(const video_format_desc& format_desc, int channel_index, int sub_index) override\r
  80         {\r
  81                 audio_cadence_  = format_desc.audio_cadence;\r
  82                 sync_buffer_    = boost::circular_buffer<size_t>(format_desc.audio_cadence.size());\r
  83                 consumer_->initialize(format_desc, channel_index, sub_index);\r
  84         }\r
  85 \r
  86         virtual bool send(const safe_ptr<read_frame>& frame) override\r
  87         {               \r
  88                 sync_buffer_.push_back(static_cast<size_t>(frame->audio_data().size()));\r
  89                 \r
  90                 if(!boost::range::equal(sync_buffer_, audio_cadence_))\r
  91                 {\r
  92                         synced_ = false;\r
  93                         CASPAR_LOG(trace) << L"[cadence_guard] Audio cadence unsynced. Skipping frame.";\r
  94                         return true;\r
  95                 }\r
  96                 else if(!synced_)\r
  97                 {\r
  98                         synced_ = true;\r
  99                         boost::range::rotate(audio_cadence_, std::begin(audio_cadence_)+1);\r
 100                         return true;\r
 101                 }\r
 102 \r
 103                 boost::range::rotate(audio_cadence_, std::begin(audio_cadence_)+1);\r
 104 \r
 105                 return consumer_->send(frame);\r
 106         }\r
 107 \r
 108         virtual std::wstring print() const override\r
 109         {\r
 110                 return consumer_->print();\r
 111         }\r
 112 \r
 113         virtual bool has_synchronization_clock() const override\r
 114         {\r
 115                 return consumer_->has_synchronization_clock();\r
 116         }\r
 117 \r
 118         virtual size_t buffer_depth() const override\r
 119         {\r
 120                 return consumer_->buffer_depth();\r
 121         }\r
 122 };\r
 123 \r
 124 safe_ptr<frame_consumer> create_consumer_cadence_guard(safe_ptr<frame_consumer>&& consumer)\r
 125 {\r
 126         return make_safe<cadence_guard>(std::move(consumer));\r
 127 }\r
 128 \r
 129 }}