]> git.sesse.net Git - casparcg/blobdiff - core/producer/stage.cpp
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[casparcg] / core / producer / stage.cpp
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-/*\r
-* Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>\r
-*\r
-* This file is part of CasparCG (www.casparcg.com).\r
-*\r
-* CasparCG is free software: you can redistribute it and/or modify\r
-* it under the terms of the GNU General Public License as published by\r
-* the Free Software Foundation, either version 3 of the License, or\r
-* (at your option) any later version.\r
-*\r
-* CasparCG is distributed in the hope that it will be useful,\r
-* but WITHOUT ANY WARRANTY; without even the implied warranty of\r
-* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
-* GNU General Public License for more details.\r
-*\r
-* You should have received a copy of the GNU General Public License\r
-* along with CasparCG. If not, see <http://www.gnu.org/licenses/>.\r
-*\r
-* Author: Robert Nagy, ronag89@gmail.com\r
-*/\r
-\r
-#include "../StdAfx.h"\r
-\r
-#include "stage.h"\r
-\r
-#include "layer.h"\r
-\r
-#include "frame/basic_frame.h"\r
-#include "frame/frame_factory.h"\r
-\r
-#include <common/concurrency/executor.h>\r
-\r
-#include <core/producer/frame/frame_transform.h>\r
-\r
-#include <boost/foreach.hpp>\r
-#include <boost/timer.hpp>\r
-\r
-#include <tbb/parallel_for_each.h>\r
-\r
-#include <boost/property_tree/ptree.hpp>\r
-#include <boost/range/algorithm_ext.hpp>\r
-\r
-#include <map>\r
-#include <vector>\r
-\r
-namespace caspar { namespace core {\r
-       \r
-template<typename T>\r
-class tweened_transform\r
-{\r
-       T source_;\r
-       T dest_;\r
-       int duration_;\r
-       int time_;\r
-       tweener_t tweener_;\r
-public:        \r
-       tweened_transform()\r
-               : duration_(0)\r
-               , time_(0)\r
-               , tweener_(get_tweener(L"linear")){}\r
-       tweened_transform(const T& source, const T& dest, int duration, const std::wstring& tween = L"linear")\r
-               : source_(source)\r
-               , dest_(dest)\r
-               , duration_(duration)\r
-               , time_(0)\r
-               , tweener_(get_tweener(tween)){}\r
-       \r
-       T fetch()\r
-       {\r
-               return time_ == duration_ ? dest_ : tween(static_cast<double>(time_), source_, dest_, static_cast<double>(duration_), tweener_);\r
-       }\r
-\r
-       T fetch_and_tick(int num)\r
-       {                                               \r
-               time_ = std::min(time_+num, duration_);\r
-               return fetch();\r
-       }\r
-};\r
-\r
-struct stage::impl : public std::enable_shared_from_this<impl>\r
-                                  , boost::noncopyable\r
-{              \r
-       safe_ptr<stage::target_t>                                                               target_;\r
-       video_format_desc                                                                               format_desc_;\r
-       \r
-       safe_ptr<diagnostics::graph>                                                    graph_;\r
-\r
-       boost::timer                                                                                    produce_timer_;\r
-       boost::timer                                                                                    tick_timer_;\r
-\r
-       std::map<int, layer>                                                                    layers_;        \r
-       std::map<int, tweened_transform<core::frame_transform>> transforms_;    \r
-\r
-       executor                                                                                                executor_;\r
-public:\r
-       impl(const safe_ptr<stage::target_t>& target, const safe_ptr<diagnostics::graph>& graph, const video_format_desc& format_desc)  \r
-               : target_(target)\r
-               , graph_(graph)\r
-               , format_desc_(format_desc)\r
-               , executor_(L"stage")\r
-       {\r
-               graph_->set_color("tick-time", diagnostics::color(0.0f, 0.6f, 0.9f));   \r
-               graph_->set_color("produce-time", diagnostics::color(0.0f, 1.0f, 0.0f));\r
-       }\r
-\r
-       void spawn_token()\r
-       {\r
-               std::weak_ptr<impl> self = shared_from_this();\r
-               executor_.begin_invoke([=]{tick(self);});\r
-       }\r
-       \r
-       void tick(const std::weak_ptr<impl>& self)\r
-       {               \r
-               try\r
-               {\r
-                       produce_timer_.restart();\r
-\r
-                       std::map<int, safe_ptr<basic_frame>> frames;\r
-               \r
-                       BOOST_FOREACH(auto& layer, layers_)                     \r
-                               frames[layer.first] = basic_frame::empty();     \r
-\r
-                       tbb::parallel_for_each(layers_.begin(), layers_.end(), [&](std::map<int, layer>::value_type& layer) \r
-                       {\r
-                               auto transform = transforms_[layer.first].fetch_and_tick(1);\r
-\r
-                               int flags = frame_producer::NO_FLAG;\r
-                               if(format_desc_.field_mode != field_mode::progressive)\r
-                               {\r
-                                       flags |= std::abs(transform.fill_scale[1]  - 1.0) > 0.0001 ? frame_producer::DEINTERLACE_FLAG : frame_producer::NO_FLAG;\r
-                                       flags |= std::abs(transform.fill_translation[1])  > 0.0001 ? frame_producer::DEINTERLACE_FLAG : frame_producer::NO_FLAG;\r
-                               }\r
-\r
-                               if(transform.is_key)\r
-                                       flags |= frame_producer::ALPHA_ONLY_FLAG;\r
-\r
-                               auto frame = layer.second.receive(flags);       \r
-                               \r
-                               auto frame1 = make_safe<core::basic_frame>(frame);\r
-                               frame1->get_frame_transform() = transform;\r
-\r
-                               if(format_desc_.field_mode != core::field_mode::progressive)\r
-                               {                               \r
-                                       auto frame2 = make_safe<core::basic_frame>(frame);\r
-                                       frame2->get_frame_transform() = transforms_[layer.first].fetch_and_tick(1);\r
-                                       frame1 = core::basic_frame::interlace(frame1, frame2, format_desc_.field_mode);\r
-                               }\r
-\r
-                               frames[layer.first] = frame1;\r
-                       });\r
-                       \r
-                       graph_->set_value("produce-time", produce_timer_.elapsed()*format_desc_.fps*0.5);\r
-                       \r
-                       std::shared_ptr<void> ticket(nullptr, [self](void*)\r
-                       {\r
-                               auto self2 = self.lock();\r
-                               if(self2)                               \r
-                                       self2->executor_.begin_invoke([=]{tick(self);});                                \r
-                       });\r
-                                               \r
-                       target_->send(std::make_pair(frames, ticket));\r
-\r
-                       graph_->set_value("tick-time", tick_timer_.elapsed()*format_desc_.fps*0.5);\r
-                       tick_timer_.restart();\r
-               }\r
-               catch(...)\r
-               {\r
-                       layers_.clear();\r
-                       CASPAR_LOG_CURRENT_EXCEPTION();\r
-               }               \r
-       }\r
-               \r
-       void set_transform(int index, const frame_transform& transform, unsigned int mix_duration, const std::wstring& tween)\r
-       {\r
-               executor_.begin_invoke([=]\r
-               {\r
-                       auto src = transforms_[index].fetch();\r
-                       auto dst = transform;\r
-                       transforms_[index] = tweened_transform<frame_transform>(src, dst, mix_duration, tween);\r
-               }, high_priority);\r
-       }\r
-                               \r
-       void apply_transform(int index, const std::function<frame_transform(frame_transform)>& transform, unsigned int mix_duration, const std::wstring& tween)\r
-       {\r
-               executor_.begin_invoke([=]\r
-               {\r
-                       auto src = transforms_[index].fetch();\r
-                       auto dst = transform(src);\r
-                       transforms_[index] = tweened_transform<frame_transform>(src, dst, mix_duration, tween);\r
-               }, high_priority);\r
-       }\r
-\r
-       void clear_transforms(int index)\r
-       {\r
-               executor_.begin_invoke([=]\r
-               {\r
-                       transforms_.erase(index);\r
-               }, high_priority);\r
-       }\r
-\r
-       void clear_transforms()\r
-       {\r
-               executor_.begin_invoke([=]\r
-               {\r
-                       transforms_.clear();\r
-               }, high_priority);\r
-       }\r
-               \r
-       void load(int index, const safe_ptr<frame_producer>& producer, bool preview, int auto_play_delta)\r
-       {\r
-               executor_.begin_invoke([=]\r
-               {\r
-                       layers_[index].load(producer, preview, auto_play_delta);\r
-               }, high_priority);\r
-       }\r
-\r
-       void pause(int index)\r
-       {               \r
-               executor_.begin_invoke([=]\r
-               {\r
-                       layers_[index].pause();\r
-               }, high_priority);\r
-       }\r
-\r
-       void play(int index)\r
-       {               \r
-               executor_.begin_invoke([=]\r
-               {\r
-                       layers_[index].play();\r
-               }, high_priority);\r
-       }\r
-\r
-       void stop(int index)\r
-       {               \r
-               executor_.begin_invoke([=]\r
-               {\r
-                       layers_[index].stop();\r
-               }, high_priority);\r
-       }\r
-\r
-       void clear(int index)\r
-       {\r
-               executor_.begin_invoke([=]\r
-               {\r
-                       layers_.erase(index);\r
-               }, high_priority);\r
-       }\r
-               \r
-       void clear()\r
-       {\r
-               executor_.begin_invoke([=]\r
-               {\r
-                       layers_.clear();\r
-               }, high_priority);\r
-       }       \r
-       \r
-       boost::unique_future<std::wstring> call(int index, bool foreground, const std::wstring& param)\r
-       {\r
-               return std::move(*executor_.invoke([=]\r
-               {\r
-                       return std::make_shared<boost::unique_future<std::wstring>>(std::move(layers_[index].call(foreground, param)));\r
-               }, high_priority));\r
-       }\r
-       \r
-       void swap_layers(const safe_ptr<stage>& other)\r
-       {\r
-               if(other->impl_.get() == this)\r
-                       return;\r
-               \r
-               auto func = [=]\r
-               {\r
-                       std::swap(layers_, other->impl_->layers_);\r
-               };              \r
-               executor_.begin_invoke([=]\r
-               {\r
-                       other->impl_->executor_.invoke(func, high_priority);\r
-               }, high_priority);\r
-       }\r
-\r
-       void swap_layer(int index, int other_index)\r
-       {\r
-               executor_.begin_invoke([=]\r
-               {\r
-                       std::swap(layers_[index], layers_[other_index]);\r
-               }, high_priority);\r
-       }\r
-\r
-       void swap_layer(int index, int other_index, const safe_ptr<stage>& other)\r
-       {\r
-               if(other->impl_.get() == this)\r
-                       swap_layer(index, other_index);\r
-               else\r
-               {\r
-                       auto func = [=]\r
-                       {\r
-                               std::swap(layers_[index], other->impl_->layers_[other_index]);\r
-                       };              \r
-                       executor_.begin_invoke([=]\r
-                       {\r
-                               other->impl_->executor_.invoke(func, high_priority);\r
-                       }, high_priority);\r
-               }\r
-       }\r
-               \r
-       boost::unique_future<safe_ptr<frame_producer>> foreground(int index)\r
-       {\r
-               return executor_.begin_invoke([=]\r
-               {\r
-                       return layers_[index].foreground();\r
-               }, high_priority);\r
-       }\r
-       \r
-       boost::unique_future<safe_ptr<frame_producer>> background(int index)\r
-       {\r
-               return executor_.begin_invoke([=]\r
-               {\r
-                       return layers_[index].background();\r
-               }, high_priority);\r
-       }\r
-       \r
-       void set_video_format_desc(const video_format_desc& format_desc)\r
-       {\r
-               executor_.begin_invoke([=]\r
-               {\r
-                       format_desc_ = format_desc;\r
-               }, high_priority);\r
-       }\r
-\r
-       boost::unique_future<boost::property_tree::wptree> info()\r
-       {\r
-               return std::move(executor_.begin_invoke([this]() -> boost::property_tree::wptree\r
-               {\r
-                       boost::property_tree::wptree info;\r
-                       BOOST_FOREACH(auto& layer, layers_)                     \r
-                               info.add_child(L"layers.layer", layer.second.info())\r
-                                       .add(L"index", layer.first);    \r
-                       return info;\r
-               }, high_priority));\r
-       }\r
-\r
-       boost::unique_future<boost::property_tree::wptree> info(int index)\r
-       {\r
-               return std::move(executor_.begin_invoke([=]() -> boost::property_tree::wptree\r
-               {\r
-                       return layers_[index].info();\r
-               }, high_priority));\r
-       }\r
-};\r
-\r
-stage::stage(const safe_ptr<stage::target_t>& target,const safe_ptr<diagnostics::graph>& graph, const video_format_desc& format_desc) : impl_(new impl(target, graph, format_desc)){}\r
-void stage::set_frame_transform(int index, const core::frame_transform& transform, unsigned int mix_duration, const std::wstring& tween){impl_->set_transform(index, transform, mix_duration, tween);}\r
-void stage::apply_frame_transform(int index, const std::function<core::frame_transform(core::frame_transform)>& transform, unsigned int mix_duration, const std::wstring& tween){impl_->apply_transform(index, transform, mix_duration, tween);}\r
-void stage::clear_transforms(int index){impl_->clear_transforms(index);}\r
-void stage::clear_transforms(){impl_->clear_transforms();}\r
-void stage::spawn_token(){impl_->spawn_token();}\r
-void stage::load(int index, const safe_ptr<frame_producer>& producer, bool preview, int auto_play_delta){impl_->load(index, producer, preview, auto_play_delta);}\r
-void stage::pause(int index){impl_->pause(index);}\r
-void stage::play(int index){impl_->play(index);}\r
-void stage::stop(int index){impl_->stop(index);}\r
-void stage::clear(int index){impl_->clear(index);}\r
-void stage::clear(){impl_->clear();}\r
-void stage::swap_layers(const safe_ptr<stage>& other){impl_->swap_layers(other);}\r
-void stage::swap_layer(int index, int other_index){impl_->swap_layer(index, other_index);}\r
-void stage::swap_layer(int index, int other_index, const safe_ptr<stage>& other){impl_->swap_layer(index, other_index, other);}\r
-boost::unique_future<safe_ptr<frame_producer>> stage::foreground(int index) {return impl_->foreground(index);}\r
-boost::unique_future<safe_ptr<frame_producer>> stage::background(int index) {return impl_->background(index);}\r
-boost::unique_future<std::wstring> stage::call(int index, bool foreground, const std::wstring& param){return impl_->call(index, foreground, param);}\r
-void stage::set_video_format_desc(const video_format_desc& format_desc){impl_->set_video_format_desc(format_desc);}\r
-boost::unique_future<boost::property_tree::wptree> stage::info() const{return impl_->info();}\r
-boost::unique_future<boost::property_tree::wptree> stage::info(int index) const{return impl_->info(index);}\r
+/*
+* Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
+*
+* This file is part of CasparCG (www.casparcg.com).
+*
+* CasparCG is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 3 of the License, or
+* (at your option) any later version.
+*
+* CasparCG is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+*
+* You should have received a copy of the GNU General Public License
+* along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
+*
+* Author: Robert Nagy, ronag89@gmail.com
+*/
+
+#include "../StdAfx.h"
+
+#include "stage.h"
+
+#include "layer.h"
+
+#include "../frame/draw_frame.h"
+#include "../frame/frame_factory.h"
+
+#include <common/executor.h>
+#include <common/future.h>
+#include <common/diagnostics/graph.h>
+
+#include <core/frame/frame_transform.h>
+
+#include <boost/foreach.hpp>
+#include <boost/timer.hpp>
+#include <boost/property_tree/ptree.hpp>
+#include <boost/range/algorithm_ext.hpp>
+
+#include <tbb/parallel_for_each.h>
+
+#include <functional>
+#include <map>
+#include <vector>
+
+namespace caspar { namespace core {
+       
+struct stage::impl : public std::enable_shared_from_this<impl>
+{                              
+       spl::shared_ptr<diagnostics::graph>                                                     graph_;
+       monitor::basic_subject                                                                          event_subject_;
+       reactive::basic_subject<std::map<int, class draw_frame>>        frames_subject_;
+       std::map<int, layer>                                                                            layers_;        
+       std::map<int, tweened_transform>                                                        tweens_;        
+       executor                                                                                                        executor_;
+public:
+       impl(spl::shared_ptr<diagnostics::graph> graph) 
+               : graph_(std::move(graph))
+               , event_subject_("stage")
+               , executor_(L"stage")
+       {
+               graph_->set_color("produce-time", diagnostics::color(0.0f, 1.0f, 0.0f));
+       }
+               
+       std::map<int, draw_frame> operator()(const struct video_format_desc& format_desc)
+       {               
+               boost::timer frame_timer;
+
+               auto frames = executor_.invoke([=]() -> std::map<int, draw_frame>
+               {
+
+                       std::map<int, class draw_frame> frames;
+                       
+                       try
+                       {                       
+                               std::vector<int> indices;
+
+                               BOOST_FOREACH(auto& layer, layers_)     
+                               {
+                                       frames[layer.first] = draw_frame::empty();      
+                                       indices.push_back(layer.first);
+                               }                               
+
+                               // WORKAROUND: Compiler doesn't seem to like lambda.
+                               tbb::parallel_for_each(indices.begin(), indices.end(), std::bind(&stage::impl::draw, this, std::placeholders::_1, std::ref(format_desc), std::ref(frames)));
+                       }
+                       catch(...)
+                       {
+                               layers_.clear();
+                               CASPAR_LOG_CURRENT_EXCEPTION();
+                       }       
+                       
+
+                       return frames;
+               });
+               
+               frames_subject_ << frames;
+               
+               graph_->set_value("produce-time", frame_timer.elapsed()*format_desc.fps*0.5);
+               event_subject_ << monitor::event("profiler/time") % frame_timer.elapsed() % (1.0/format_desc.fps);
+
+               return frames;
+       }
+
+       void draw(int index, const video_format_desc& format_desc, std::map<int, draw_frame>& frames)
+       {
+               auto& layer             = layers_[index];
+               auto& tween             = tweens_[index];
+                               
+               auto frame  = layer.receive(format_desc);                                       
+               auto frame1 = frame;
+               frame1.transform() *= tween.fetch_and_tick(1);
+
+               if(format_desc.field_mode != core::field_mode::progressive)
+               {                               
+                       auto frame2 = frame;
+                       frame2.transform() *= tween.fetch_and_tick(1);
+                       frame1 = core::draw_frame::interlace(frame1, frame2, format_desc.field_mode);
+               }
+
+               frames[index] = frame1;
+       }
+
+       layer& get_layer(int index)
+       {
+               auto it = layers_.find(index);
+               if(it == std::end(layers_))
+               {
+                       it = layers_.insert(std::make_pair(index, layer(index))).first;
+                       it->second.subscribe(event_subject_);
+               }
+               return it->second;
+       }
+               
+       boost::unique_future<void> apply_transforms(const std::vector<std::tuple<int, stage::transform_func_t, unsigned int, tweener>>& transforms)
+       {
+               return executor_.begin_invoke([=]
+               {
+                       BOOST_FOREACH(auto& transform, transforms)
+                       {
+                               auto src = tweens_[std::get<0>(transform)].fetch();
+                               auto dst = std::get<1>(transform)(src);
+                               tweens_[std::get<0>(transform)] = tweened_transform(src, dst, std::get<2>(transform), std::get<3>(transform));
+                       }
+               }, task_priority::high_priority);
+       }
+                                               
+       boost::unique_future<void> apply_transform(int index, const stage::transform_func_t& transform, unsigned int mix_duration, const tweener& tween)
+       {
+               return executor_.begin_invoke([=]
+               {
+                       auto src = tweens_[index].fetch();
+                       auto dst = transform(src);
+                       tweens_[index] = tweened_transform(src, dst, mix_duration, tween);
+               }, task_priority::high_priority);
+       }
+
+       boost::unique_future<void> clear_transforms(int index)
+       {
+               return executor_.begin_invoke([=]
+               {
+                       tweens_.erase(index);
+               }, task_priority::high_priority);
+       }
+
+       boost::unique_future<void> clear_transforms()
+       {
+               return executor_.begin_invoke([=]
+               {
+                       tweens_.clear();
+               }, task_priority::high_priority);
+       }
+               
+       boost::unique_future<void> load(int index, const spl::shared_ptr<frame_producer>& producer, bool preview, const boost::optional<int32_t>& auto_play_delta)
+       {
+               return executor_.begin_invoke([=]
+               {
+                       get_layer(index).load(producer, preview, auto_play_delta);                      
+               }, task_priority::high_priority);
+       }
+
+       boost::unique_future<void> pause(int index)
+       {               
+               return executor_.begin_invoke([=]
+               {
+                       layers_[index].pause();
+               }, task_priority::high_priority);
+       }
+
+       boost::unique_future<void> play(int index)
+       {               
+               return executor_.begin_invoke([=]
+               {
+                       layers_[index].play();
+               }, task_priority::high_priority);
+       }
+
+       boost::unique_future<void> stop(int index)
+       {               
+               return executor_.begin_invoke([=]
+               {
+                       layers_[index].stop();
+               }, task_priority::high_priority);
+       }
+
+       boost::unique_future<void> clear(int index)
+       {
+               return executor_.begin_invoke([=]
+               {
+                       layers_.erase(index);
+               }, task_priority::high_priority);
+       }
+               
+       boost::unique_future<void> clear()
+       {
+               return executor_.begin_invoke([=]
+               {
+                       layers_.clear();
+               }, task_priority::high_priority);
+       }       
+               
+       boost::unique_future<void> swap_layers(stage& other)
+       {
+               auto other_impl = other.impl_;
+
+               if(other_impl.get() == this)
+                       return async(launch::deferred, []{});
+               
+               auto func = [=]
+               {
+                       auto layers                     = layers_ | boost::adaptors::map_values;
+                       auto other_layers       = other_impl->layers_ | boost::adaptors::map_values;
+
+                       BOOST_FOREACH(auto& layer, layers)
+                               layer.unsubscribe(event_subject_);
+                       
+                       BOOST_FOREACH(auto& layer, other_layers)
+                               layer.unsubscribe(event_subject_);
+                       
+                       std::swap(layers_, other_impl->layers_);
+                                               
+                       BOOST_FOREACH(auto& layer, layers)
+                               layer.subscribe(event_subject_);
+                       
+                       BOOST_FOREACH(auto& layer, other_layers)
+                               layer.subscribe(event_subject_);
+               };              
+
+               return executor_.begin_invoke([=]
+               {
+                       other_impl->executor_.invoke(func, task_priority::high_priority);
+               }, task_priority::high_priority);
+       }
+
+       boost::unique_future<void> swap_layer(int index, int other_index)
+       {
+               return executor_.begin_invoke([=]
+               {
+                       std::swap(layers_[index], layers_[other_index]);
+               }, task_priority::high_priority);
+       }
+
+       boost::unique_future<void> swap_layer(int index, int other_index, stage& other)
+       {
+               auto other_impl = other.impl_;
+
+               if(other_impl.get() == this)
+                       return swap_layer(index, other_index);
+               else
+               {
+                       auto func = [=]
+                       {
+                               auto& my_layer          = get_layer(index);
+                               auto& other_layer       = other_impl->get_layer(other_index);
+
+                               my_layer.unsubscribe(event_subject_);
+                               other_layer.unsubscribe(other_impl->event_subject_);
+
+                               std::swap(my_layer, other_layer);
+
+                               my_layer.subscribe(event_subject_);
+                               other_layer.subscribe(other_impl->event_subject_);
+                       };              
+
+                       return executor_.begin_invoke([=]
+                       {
+                               other_impl->executor_.invoke(func, task_priority::high_priority);
+                       }, task_priority::high_priority);
+               }
+       }
+               
+       boost::unique_future<spl::shared_ptr<frame_producer>> foreground(int index)
+       {
+               return executor_.begin_invoke([=]
+               {
+                       return layers_[index].foreground();
+               }, task_priority::high_priority);
+       }
+       
+       boost::unique_future<spl::shared_ptr<frame_producer>> background(int index)
+       {
+               return executor_.begin_invoke([=]
+               {
+                       return layers_[index].background();
+               }, task_priority::high_priority);
+       }
+
+       boost::unique_future<boost::property_tree::wptree> info()
+       {
+               return executor_.begin_invoke([this]() -> boost::property_tree::wptree
+               {
+                       boost::property_tree::wptree info;
+                       BOOST_FOREACH(auto& layer, layers_)                     
+                               info.add_child(L"layers.layer", layer.second.info())
+                                       .add(L"index", layer.first);    
+                       return info;
+               }, task_priority::high_priority);
+       }
+
+       boost::unique_future<boost::property_tree::wptree> info(int index)
+       {
+               return executor_.begin_invoke([=]
+               {
+                       return layers_[index].info();
+               }, task_priority::high_priority);
+       }               
+       
+       boost::unique_future<std::wstring> call(int index, const std::wstring& params)
+       {
+               return flatten(executor_.begin_invoke([=]
+               {
+                       return make_shared(layers_[index].foreground()->call(params));
+               }, task_priority::high_priority));
+       }
+};
+
+stage::stage(spl::shared_ptr<diagnostics::graph> graph) : impl_(new impl(std::move(graph))){}
+boost::unique_future<std::wstring> stage::call(int index, const std::wstring& params){return impl_->call(index, params);}
+boost::unique_future<void> stage::apply_transforms(const std::vector<stage::transform_tuple_t>& transforms){return impl_->apply_transforms(transforms);}
+boost::unique_future<void> stage::apply_transform(int index, const std::function<core::frame_transform(core::frame_transform)>& transform, unsigned int mix_duration, const tweener& tween){return impl_->apply_transform(index, transform, mix_duration, tween);}
+boost::unique_future<void> stage::clear_transforms(int index){return impl_->clear_transforms(index);}
+boost::unique_future<void> stage::clear_transforms(){return impl_->clear_transforms();}
+boost::unique_future<void> stage::load(int index, const spl::shared_ptr<frame_producer>& producer, bool preview, const boost::optional<int32_t>& auto_play_delta){return impl_->load(index, producer, preview, auto_play_delta);}
+boost::unique_future<void> stage::pause(int index){return impl_->pause(index);}
+boost::unique_future<void> stage::play(int index){return impl_->play(index);}
+boost::unique_future<void> stage::stop(int index){return impl_->stop(index);}
+boost::unique_future<void> stage::clear(int index){return impl_->clear(index);}
+boost::unique_future<void> stage::clear(){return impl_->clear();}
+boost::unique_future<void> stage::swap_layers(stage& other){return impl_->swap_layers(other);}
+boost::unique_future<void> stage::swap_layer(int index, int other_index){return impl_->swap_layer(index, other_index);}
+boost::unique_future<void> stage::swap_layer(int index, int other_index, stage& other){return impl_->swap_layer(index, other_index, other);}
+boost::unique_future<spl::shared_ptr<frame_producer>> stage::foreground(int index) {return impl_->foreground(index);}
+boost::unique_future<spl::shared_ptr<frame_producer>> stage::background(int index) {return impl_->background(index);}
+boost::unique_future<boost::property_tree::wptree> stage::info() const{return impl_->info();}
+boost::unique_future<boost::property_tree::wptree> stage::info(int index) const{return impl_->info(index);}
+std::map<int, class draw_frame> stage::operator()(const video_format_desc& format_desc){return (*impl_)(format_desc);}
+void stage::subscribe(const monitor::observable::observer_ptr& o) {impl_->event_subject_.subscribe(o);}
+void stage::unsubscribe(const monitor::observable::observer_ptr& o) {impl_->event_subject_.unsubscribe(o);}
+void stage::subscribe(const frame_observable::observer_ptr& o) {impl_->frames_subject_.subscribe(o);}
+void stage::unsubscribe(const frame_observable::observer_ptr& o) {impl_->frames_subject_.unsubscribe(o);}
 }}
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