2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
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4 * This file is part of CasparCG (www.casparcg.com).
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6 * CasparCG is free software: you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation, either version 3 of the License, or
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9 * (at your option) any later version.
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11 * CasparCG is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 * GNU General Public License for more details.
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16 * You should have received a copy of the GNU General Public License
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17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
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19 * Author: Robert Nagy, ronag89@gmail.com
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22 #include "../StdAfx.h"
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24 #include "frame_producer.h"
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25 #include "frame/basic_frame.h"
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26 #include "frame/frame_transform.h"
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28 #include "color/color_producer.h"
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29 #include "playlist/playlist_producer.h"
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30 #include "separated/separated_producer.h"
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32 #include <common/memory/safe_ptr.h>
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33 #include <common/concurrency/executor.h>
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34 #include <common/exception/exceptions.h>
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35 #include <common/utility/move_on_copy.h>
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37 namespace caspar { namespace core {
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39 std::vector<const producer_factory_t> g_factories;
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41 class destroy_producer_proxy : public frame_producer
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43 std::shared_ptr<frame_producer>* producer_;
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45 destroy_producer_proxy(safe_ptr<frame_producer>&& producer)
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46 : producer_(new std::shared_ptr<frame_producer>(std::move(producer)))
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50 ~destroy_producer_proxy()
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52 static auto destroyers = std::make_shared<tbb::concurrent_bounded_queue<std::shared_ptr<executor>>>();
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53 static tbb::atomic<int> destroyer_count;
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57 std::shared_ptr<executor> destroyer;
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58 if(!destroyers->try_pop(destroyer))
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60 destroyer.reset(new executor("destroyer"));
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61 destroyer->set_priority_class(below_normal_priority_class);
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62 if(++destroyer_count > 16)
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63 CASPAR_LOG(warning) << "Potential destroyer dead-lock detected.";
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64 CASPAR_LOG(trace) << "Created destroyer: " << destroyer_count;
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67 auto producer = producer_;
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68 auto pool = destroyers;
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69 destroyer->begin_invoke([=]
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73 if(!producer->unique())
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74 CASPAR_LOG(trace) << (*producer)->print() << " Not destroyed on safe asynchronous destruction thread: " << producer->use_count();
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76 CASPAR_LOG(trace) << (*producer)->print() << " Destroying on safe asynchronous destruction thread.";
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81 pool->push(destroyer);
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86 CASPAR_LOG_CURRENT_EXCEPTION();
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95 virtual safe_ptr<basic_frame> receive(int hints) override {return (*producer_)->receive(hints);}
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96 virtual safe_ptr<basic_frame> last_frame() const override {return (*producer_)->last_frame();}
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97 virtual std::string print() const override {return (*producer_)->print();}
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98 virtual boost::property_tree::ptree info() const override {return (*producer_)->info();}
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99 virtual boost::unique_future<std::string> call(const std::string& str) override {return (*producer_)->call(str);}
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100 virtual safe_ptr<frame_producer> get_following_producer() const override {return (*producer_)->get_following_producer();}
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101 virtual void set_leading_producer(const safe_ptr<frame_producer>& producer) override {(*producer_)->set_leading_producer(producer);}
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102 virtual uint32_t nb_frames() const override {return (*producer_)->nb_frames();}
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105 safe_ptr<core::frame_producer> create_producer_destroy_proxy(safe_ptr<core::frame_producer>&& producer)
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107 return make_safe<destroy_producer_proxy>(std::move(producer));
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110 class last_frame_producer : public frame_producer
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112 const std::string print_;
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113 const safe_ptr<basic_frame> frame_;
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114 const uint32_t nb_frames_;
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116 last_frame_producer(const safe_ptr<frame_producer>& producer)
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117 : print_(producer->print())
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118 , frame_(producer->last_frame() != basic_frame::eof() ? producer->last_frame() : basic_frame::empty())
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119 , nb_frames_(producer->nb_frames())
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123 virtual safe_ptr<basic_frame> receive(int){return frame_;}
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124 virtual safe_ptr<core::basic_frame> last_frame() const{return frame_;}
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125 virtual std::string print() const{return "dummy[" + print_ + "]";}
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126 virtual uint32_t nb_frames() const {return nb_frames_;}
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127 virtual boost::property_tree::ptree info() const override
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129 boost::property_tree::ptree info;
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130 info.add("type", "last-frame-producer");
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135 struct empty_frame_producer : public frame_producer
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137 virtual safe_ptr<basic_frame> receive(int){return basic_frame::empty();}
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138 virtual safe_ptr<basic_frame> last_frame() const{return basic_frame::empty();}
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139 virtual void set_frame_factory(const safe_ptr<frame_factory>&){}
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140 virtual uint32_t nb_frames() const {return 0;}
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141 virtual std::string print() const { return "empty";}
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143 virtual boost::property_tree::ptree info() const override
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145 boost::property_tree::ptree info;
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146 info.add("type", "empty-producer");
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151 const safe_ptr<frame_producer>& frame_producer::empty() // nothrow
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153 static safe_ptr<frame_producer> producer = make_safe<empty_frame_producer>();
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157 safe_ptr<basic_frame> receive_and_follow(safe_ptr<frame_producer>& producer, int hints)
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159 auto frame = producer->receive(hints);
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160 if(frame == basic_frame::eof())
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162 CASPAR_LOG(info) << producer->print() << " End Of File.";
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163 auto following = producer->get_following_producer();
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164 if(following != frame_producer::empty())
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166 following->set_leading_producer(producer);
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167 producer = std::move(following);
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170 producer = make_safe<last_frame_producer>(producer);
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172 return receive_and_follow(producer, hints);
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177 void register_producer_factory(const producer_factory_t& factory)
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179 g_factories.push_back(factory);
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182 safe_ptr<core::frame_producer> do_create_producer(const safe_ptr<frame_factory>& my_frame_factory, const std::vector<std::string>& params)
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185 BOOST_THROW_EXCEPTION(invalid_argument() << arg_name_info("params") << arg_value_info(""));
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187 auto producer = frame_producer::empty();
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188 std::any_of(g_factories.begin(), g_factories.end(), [&](const producer_factory_t& factory) -> bool
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192 producer = factory(my_frame_factory, params);
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196 CASPAR_LOG_CURRENT_EXCEPTION();
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198 return producer != frame_producer::empty();
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201 if(producer == frame_producer::empty())
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202 producer = create_color_producer(my_frame_factory, params);
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204 if(producer == frame_producer::empty())
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205 producer = create_playlist_producer(my_frame_factory, params);
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211 safe_ptr<core::frame_producer> create_producer(const safe_ptr<frame_factory>& my_frame_factory, const std::vector<std::string>& params)
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213 auto producer = do_create_producer(my_frame_factory, params);
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214 auto key_producer = frame_producer::empty();
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216 try // to find a key file.
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218 auto params_copy = params;
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219 if(params_copy.size() > 0)
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221 params_copy[0] += "_A";
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222 key_producer = do_create_producer(my_frame_factory, params_copy);
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223 if(key_producer == frame_producer::empty())
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225 params_copy[0] += "LPHA";
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226 key_producer = do_create_producer(my_frame_factory, params_copy);
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232 if(producer != frame_producer::empty() && key_producer != frame_producer::empty())
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233 return create_separated_producer(producer, key_producer);
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235 if(producer == frame_producer::empty())
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238 BOOST_FOREACH(auto& param, params)
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239 str += param + " ";
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240 BOOST_THROW_EXCEPTION(file_not_found() << msg_info("No match found for supplied commands. Check syntax.") << arg_value_info((str)));
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247 safe_ptr<core::frame_producer> create_producer(const safe_ptr<frame_factory>& factory, const std::string& params)
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249 std::stringstream iss(params);
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250 std::vector<std::string> tokens;
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251 typedef std::istream_iterator<std::string, char, std::char_traits<char> > iterator;
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252 std::copy(iterator(iss), iterator(), std::back_inserter(tokens));
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253 return create_producer(factory, tokens);
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