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_consumer.h"
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26 #include <common/except.h>
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28 #include <core/video_format.h>
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29 #include <core/frame/data_frame.h>
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31 #include <common/concurrency/async.h>
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33 namespace caspar { namespace core {
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35 std::vector<const consumer_factory_t> g_factories;
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37 void register_consumer_factory(const consumer_factory_t& factory)
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39 g_factories.push_back(factory);
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42 class destroy_consumer_proxy : public frame_consumer
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44 std::unique_ptr<std::shared_ptr<frame_consumer>> consumer_;
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46 destroy_consumer_proxy(spl::shared_ptr<frame_consumer>&& consumer)
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47 : consumer_(new std::shared_ptr<frame_consumer>(std::move(consumer)))
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51 ~destroy_consumer_proxy()
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53 static tbb::atomic<int> counter = tbb::atomic<int>();
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56 CASPAR_VERIFY(counter < 32);
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58 auto consumer = consumer_.release();
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61 std::unique_ptr<std::shared_ptr<frame_consumer>> pointer_guard(consumer);
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63 auto str = (*consumer)->print();
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66 if(!consumer->unique())
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67 CASPAR_LOG(trace) << str << L" Not destroyed on asynchronous destruction thread: " << consumer->use_count();
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69 CASPAR_LOG(trace) << str << L" Destroying on asynchronous destruction thread.";
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73 pointer_guard.reset();
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79 virtual bool send(const spl::shared_ptr<const struct data_frame>& frame) { return (*consumer_)->send(frame);}
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80 virtual void initialize(const struct video_format_desc& format_desc, int channel_index) { return (*consumer_)->initialize(format_desc, channel_index);}
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81 virtual std::wstring print() const { return (*consumer_)->print();}
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82 virtual boost::property_tree::wptree info() const { return (*consumer_)->info();}
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83 virtual bool has_synchronization_clock() const { return (*consumer_)->has_synchronization_clock();}
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84 virtual int buffer_depth() const { return (*consumer_)->buffer_depth();}
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85 virtual int index() const { return (*consumer_)->index();}
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88 class print_consumer_proxy : public frame_consumer
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90 std::shared_ptr<frame_consumer> consumer_;
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92 print_consumer_proxy(spl::shared_ptr<frame_consumer>&& consumer)
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93 : consumer_(std::move(consumer))
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95 CASPAR_LOG(info) << consumer_->print() << L" Initialized.";
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98 ~print_consumer_proxy()
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100 auto str = consumer_->print();
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101 CASPAR_LOG(trace) << str << L" Uninitializing.";
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103 CASPAR_LOG(info) << str << L" Uninitialized.";
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106 virtual bool send(const spl::shared_ptr<const struct data_frame>& frame) { return consumer_->send(frame);}
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107 virtual void initialize(const struct video_format_desc& format_desc, int channel_index) { return consumer_->initialize(format_desc, channel_index);}
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108 virtual std::wstring print() const { return consumer_->print();}
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109 virtual boost::property_tree::wptree info() const { return consumer_->info();}
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110 virtual bool has_synchronization_clock() const { return consumer_->has_synchronization_clock();}
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111 virtual int buffer_depth() const { return consumer_->buffer_depth();}
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112 virtual int index() const { return consumer_->index();}
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115 // This class is used to guarantee that audio cadence is correct. This is important for NTSC audio.
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116 class cadence_guard : public frame_consumer
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118 spl::shared_ptr<frame_consumer> consumer_;
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119 std::vector<int> audio_cadence_;
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120 boost::circular_buffer<int> sync_buffer_;
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122 cadence_guard(const spl::shared_ptr<frame_consumer>& consumer)
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123 : consumer_(consumer)
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127 virtual void initialize(const video_format_desc& format_desc, int channel_index) override
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129 audio_cadence_ = format_desc.audio_cadence;
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130 sync_buffer_ = boost::circular_buffer<int>(format_desc.audio_cadence.size());
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131 consumer_->initialize(format_desc, channel_index);
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134 virtual bool send(const spl::shared_ptr<const data_frame>& frame) override
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136 if(audio_cadence_.size() == 1)
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137 return consumer_->send(frame);
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139 bool result = true;
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141 if(boost::range::equal(sync_buffer_, audio_cadence_) && audio_cadence_.front() == static_cast<int>(frame->audio_data().size()))
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143 // Audio sent so far is in sync, now we can send the next chunk.
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144 result = consumer_->send(frame);
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145 boost::range::rotate(audio_cadence_, std::begin(audio_cadence_)+1);
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148 CASPAR_LOG(trace) << print() << L" Syncing audio.";
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150 sync_buffer_.push_back(static_cast<int>(frame->audio_data().size()));
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155 virtual std::wstring print() const override {return consumer_->print(); }
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156 virtual boost::property_tree::wptree info() const override {return consumer_->info(); }
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157 virtual bool has_synchronization_clock() const override {return consumer_->has_synchronization_clock();}
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158 virtual int buffer_depth() const override {return consumer_->buffer_depth();}
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159 virtual int index() const override {return consumer_->index();}
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162 spl::shared_ptr<core::frame_consumer> create_consumer(const std::vector<std::wstring>& params)
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165 BOOST_THROW_EXCEPTION(invalid_argument() << arg_name_info("params") << arg_value_info(""));
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167 auto consumer = frame_consumer::empty();
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168 std::any_of(g_factories.begin(), g_factories.end(), [&](const consumer_factory_t& factory) -> bool
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172 consumer = factory(params);
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176 CASPAR_LOG_CURRENT_EXCEPTION();
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178 return consumer != frame_consumer::empty();
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181 if(consumer == frame_consumer::empty())
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182 BOOST_THROW_EXCEPTION(file_not_found() << msg_info("No match found for supplied commands. Check syntax."));
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184 return spl::make_shared<destroy_consumer_proxy>(
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185 spl::make_shared<print_consumer_proxy>(
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186 spl::make_shared<cadence_guard>(
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187 std::move(consumer))));
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190 const spl::shared_ptr<frame_consumer>& frame_consumer::empty()
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192 struct empty_frame_consumer : public frame_consumer
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194 virtual bool send(const spl::shared_ptr<const data_frame>&) override {return false;}
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195 virtual void initialize(const video_format_desc&, int) override{}
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196 virtual std::wstring print() const override {return L"empty";}
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197 virtual bool has_synchronization_clock() const override {return false;}
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198 virtual int buffer_depth() const override {return 0;};
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199 virtual int index() const{return -1;}
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200 virtual boost::property_tree::wptree info() const override
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202 boost::property_tree::wptree info;
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203 info.add(L"type", L"empty-consumer");
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207 static spl::shared_ptr<frame_consumer> consumer = spl::make_shared<empty_frame_consumer>();
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