git.sesse.net Git - casparcg/blob - core/consumer/frame_consumer.cpp

   1 /*\r
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 * This file is part of CasparCG (www.casparcg.com).\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 * Author: Robert Nagy, ronag89@gmail.com\r
  20 */\r
  21 \r
  22 #include "../StdAfx.h"\r
  23 \r
  24 #include "frame_consumer.h"\r
  25 \r
  26 #include <common/env.h>\r
  27 #include <common/memory/safe_ptr.h>\r
  28 #include <common/exception/exceptions.h>\r
  29 #include <core/video_format.h>\r
  30 #include <core/mixer/read_frame.h>\r
  31 \r
  32 #include <boost/circular_buffer.hpp>\r
  33 \r
  34 namespace caspar { namespace core {\r
  35                 \r
  36 std::vector<const consumer_factory_t> g_factories;\r
  37 \r
  38 void register_consumer_factory(const consumer_factory_t& factory)\r
  39 {\r
  40         g_factories.push_back(factory);\r
  41 }\r
  42 \r
  43 safe_ptr<core::frame_consumer> create_consumer(const std::vector<std::wstring>& params)\r
  44 {\r
  45         if(params.empty())\r
  46                 BOOST_THROW_EXCEPTION(invalid_argument() << arg_name_info("params") << arg_value_info(""));\r
  47         \r
  48         auto consumer = frame_consumer::empty();\r
  49         std::any_of(g_factories.begin(), g_factories.end(), [&](const consumer_factory_t& factory) -> bool\r
  50                 {\r
  51                         try\r
  52                         {\r
  53                                 consumer = factory(params);\r
  54                         }\r
  55                         catch(...)\r
  56                         {\r
  57                                 CASPAR_LOG_CURRENT_EXCEPTION();\r
  58                         }\r
  59                         return consumer != frame_consumer::empty();\r
  60                 });\r
  61 \r
  62         if(consumer == frame_consumer::empty())\r
  63                 BOOST_THROW_EXCEPTION(file_not_found() << msg_info("No match found for supplied commands. Check syntax."));\r
  64 \r
  65         return consumer;\r
  66 }\r
  67 \r
  68 // This class is used to guarantee that audio cadence is correct. This is important for NTSC audio.\r
  69 class cadence_guard : public frame_consumer\r
  70 {\r
  71         safe_ptr<frame_consumer>                consumer_;\r
  72         std::vector<size_t>                             audio_cadence_;\r
  73         boost::circular_buffer<size_t>  sync_buffer_;\r
  74 public:\r
  75         cadence_guard(const safe_ptr<frame_consumer>& consumer)\r
  76                 : consumer_(consumer)\r
  77         {\r
  78         }\r
  79         \r
  80         virtual void initialize(const video_format_desc& format_desc, int channel_index) override\r
  81         {\r
  82                 audio_cadence_  = format_desc.audio_cadence;\r
  83                 sync_buffer_    = boost::circular_buffer<size_t>(format_desc.audio_cadence.size());\r
  84                 consumer_->initialize(format_desc, channel_index);\r
  85         }\r
  86 \r
  87         virtual bool send(const safe_ptr<read_frame>& frame) override\r
  88         {               \r
  89                 if(audio_cadence_.size() == 1)\r
  90                         return consumer_->send(frame);\r
  91 \r
  92                 bool result = true;\r
  93                 \r
  94                 if(boost::range::equal(sync_buffer_, audio_cadence_) && audio_cadence_.front() == static_cast<size_t>(frame->audio_data().size())) \r
  95                 {       \r
  96                         // Audio sent so far is in sync, now we can send the next chunk.\r
  97                         result = consumer_->send(frame);\r
  98                         boost::range::rotate(audio_cadence_, std::begin(audio_cadence_)+1);\r
  99                 }\r
 100                 else\r
 101                         CASPAR_LOG(trace) << print() << L" Syncing audio.";\r
 102 \r
 103                 sync_buffer_.push_back(static_cast<size_t>(frame->audio_data().size()));\r
 104                 \r
 105                 return result;\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 boost::property_tree::wptree info() const override\r
 114         {\r
 115                 return consumer_->info();\r
 116         }\r
 117 \r
 118         virtual bool has_synchronization_clock() const override\r
 119         {\r
 120                 return consumer_->has_synchronization_clock();\r
 121         }\r
 122 \r
 123         virtual size_t buffer_depth() const override\r
 124         {\r
 125                 return consumer_->buffer_depth();\r
 126         }\r
 127 \r
 128         virtual int index() const override\r
 129         {\r
 130                 return consumer_->index();\r
 131         }\r
 132 };\r
 133 \r
 134 safe_ptr<frame_consumer> create_consumer_cadence_guard(const safe_ptr<frame_consumer>& consumer)\r
 135 {\r
 136         return make_safe<cadence_guard>(std::move(consumer));\r
 137 }\r
 138 \r
 139 const safe_ptr<frame_consumer>& frame_consumer::empty()\r
 140 {\r
 141         struct empty_frame_consumer : public frame_consumer\r
 142         {\r
 143                 virtual bool send(const safe_ptr<read_frame>&) override {return false;}\r
 144                 virtual void initialize(const video_format_desc&, int) override{}\r
 145                 virtual std::wstring print() const override {return L"empty";}\r
 146                 virtual bool has_synchronization_clock() const override {return false;}\r
 147                 virtual size_t buffer_depth() const override {return 0;};\r
 148                 virtual int index() const{return -1;}\r
 149                 virtual boost::property_tree::wptree info() const override\r
 150                 {\r
 151                         boost::property_tree::wptree info;\r
 152                         info.add(L"type", L"empty-consumer");\r
 153                         return info;\r
 154                 }\r
 155         };\r
 156         static safe_ptr<frame_consumer> consumer = make_safe<empty_frame_consumer>();\r
 157         return consumer;\r
 158 }\r
 159 \r
 160 }}