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[casparcg] / core / producer / layer.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 "layer.h"\r
25 \r
26 #include "frame_producer.h"\r
27 \r
28 #include "../video_format.h"\r
29 #include "../frame/draw_frame.h"\r
30 #include "../frame/frame_transform.h"\r
31 \r
32 #include <boost/optional.hpp>\r
33 #include <boost/thread/future.hpp>\r
34 \r
35 namespace caspar { namespace core {\r
36 \r
37 struct layer::impl\r
38 {                               \r
39         monitor::basic_subject                          event_subject_;\r
40         monitor::basic_subject                          foreground_event_subject_;\r
41         monitor::basic_subject                          background_event_subject_;\r
42         spl::shared_ptr<frame_producer>         foreground_;\r
43         spl::shared_ptr<frame_producer>         background_;\r
44         boost::optional<int32_t>                        auto_play_delta_;\r
45 \r
46 public:\r
47         impl(int index) \r
48                 : event_subject_(monitor::path("layer") % index)\r
49                 , foreground_event_subject_("")\r
50                 , background_event_subject_("background")\r
51                 , foreground_(frame_producer::empty())\r
52                 , background_(frame_producer::empty())\r
53         {\r
54                 foreground_event_subject_.subscribe(event_subject_);\r
55                 background_event_subject_.subscribe(event_subject_);\r
56         }\r
57 \r
58         void pause()\r
59         {\r
60                 foreground_->paused(true);\r
61         }\r
62         \r
63         void load(spl::shared_ptr<frame_producer> producer, bool preview, const boost::optional<int32_t>& auto_play_delta)\r
64         {               \r
65                 background_->unsubscribe(background_event_subject_);\r
66                 background_ = std::move(producer);\r
67                 background_->subscribe(background_event_subject_);\r
68 \r
69                 auto_play_delta_ = auto_play_delta;\r
70 \r
71                 if(preview)\r
72                 {\r
73                         play();\r
74                         foreground_->receive();\r
75                         foreground_->paused(true);\r
76                 }\r
77 \r
78                 if(auto_play_delta_ && foreground_ == frame_producer::empty())\r
79                         play();\r
80         }\r
81         \r
82         void play()\r
83         {                       \r
84                 if(background_ != frame_producer::empty())\r
85                 {\r
86                         background_->leading_producer(foreground_);\r
87 \r
88                         background_->unsubscribe(background_event_subject_);\r
89                         foreground_->unsubscribe(foreground_event_subject_);\r
90 \r
91                         foreground_ = std::move(background_);\r
92                         background_ = std::move(frame_producer::empty());\r
93                         \r
94                         foreground_->subscribe(foreground_event_subject_);\r
95 \r
96                         auto_play_delta_.reset();\r
97                 }\r
98 \r
99                 foreground_->paused(false);\r
100         }\r
101         \r
102         void stop()\r
103         {\r
104                 foreground_->unsubscribe(foreground_event_subject_);\r
105 \r
106                 foreground_ = std::move(frame_producer::empty());\r
107 \r
108                 auto_play_delta_.reset();\r
109         }\r
110                 \r
111         draw_frame receive(const video_format_desc& format_desc)\r
112         {               \r
113                 try\r
114                 {               \r
115                         auto frame = foreground_->receive();\r
116 \r
117                         if(frame == core::draw_frame::late())\r
118                                 return foreground_->last_frame();\r
119                                                 \r
120                         if(auto_play_delta_)\r
121                         {\r
122                                 auto frames_left = static_cast<int64_t>(foreground_->nb_frames()) - foreground_->frame_number() - static_cast<int64_t>(*auto_play_delta_);\r
123                                 if(frames_left < 1)\r
124                                 {\r
125                                         play();\r
126                                         return receive(format_desc);\r
127                                 }\r
128                         }\r
129 \r
130                         event_subject_  << monitor::event("time")       % monitor::duration(foreground_->frame_number()/format_desc.fps)\r
131                                                                                                                 % monitor::duration(static_cast<int64_t>(foreground_->nb_frames()) - static_cast<int64_t>(auto_play_delta_ ? *auto_play_delta_ : 0)/format_desc.fps)\r
132                                                         << monitor::event("frame")      % static_cast<int64_t>(foreground_->frame_number())\r
133                                                                                                                 % static_cast<int64_t>((static_cast<int64_t>(foreground_->nb_frames()) - static_cast<int64_t>(auto_play_delta_ ? *auto_play_delta_ : 0)));\r
134 \r
135                         foreground_event_subject_ << monitor::event("type") % foreground_->name();\r
136                         background_event_subject_ << monitor::event("type") % background_->name();\r
137                                 \r
138                         return frame;\r
139                 }\r
140                 catch(...)\r
141                 {\r
142                         CASPAR_LOG_CURRENT_EXCEPTION();\r
143                         stop();\r
144                         return core::draw_frame::empty();\r
145                 }\r
146         }\r
147         \r
148         boost::property_tree::wptree info() const\r
149         {\r
150                 boost::property_tree::wptree info;\r
151                 info.add(L"auto_delta", (auto_play_delta_ ? boost::lexical_cast<std::wstring>(*auto_play_delta_) : L"null"));\r
152                 info.add(L"frame-number", foreground_->frame_number());\r
153 \r
154                 auto nb_frames = foreground_->nb_frames();\r
155 \r
156                 info.add(L"nb_frames",   nb_frames == std::numeric_limits<int64_t>::max() ? -1 : nb_frames);\r
157                 info.add(L"frames-left", nb_frames == std::numeric_limits<int64_t>::max() ? -1 : (foreground_->nb_frames() - foreground_->frame_number() - (auto_play_delta_ ? *auto_play_delta_ : 0)));\r
158                 info.add_child(L"producer", foreground_->info());\r
159                 info.add_child(L"background.producer", background_->info());\r
160                 return info;\r
161         }\r
162 };\r
163 \r
164 layer::layer(int index) : impl_(new impl(index)){}\r
165 layer::layer(layer&& other) : impl_(std::move(other.impl_)){}\r
166 layer& layer::operator=(layer&& other)\r
167 {\r
168         other.swap(*this);\r
169         return *this;\r
170 }\r
171 void layer::swap(layer& other)\r
172 {       \r
173         impl_.swap(other.impl_);\r
174 }\r
175 void layer::load(spl::shared_ptr<frame_producer> frame_producer, bool preview, const boost::optional<int32_t>& auto_play_delta){return impl_->load(std::move(frame_producer), preview, auto_play_delta);}       \r
176 void layer::play(){impl_->play();}\r
177 void layer::pause(){impl_->pause();}\r
178 void layer::stop(){impl_->stop();}\r
179 draw_frame layer::receive(const video_format_desc& format_desc) {return impl_->receive(format_desc);}\r
180 spl::shared_ptr<frame_producer> layer::foreground() const { return impl_->foreground_;}\r
181 spl::shared_ptr<frame_producer> layer::background() const { return impl_->background_;}\r
182 boost::property_tree::wptree layer::info() const{return impl_->info();}\r
183 void layer::subscribe(const monitor::observable::observer_ptr& o) {impl_->event_subject_.subscribe(o);}\r
184 void layer::unsubscribe(const monitor::observable::observer_ptr& o) {impl_->event_subject_.unsubscribe(o);}\r
185 }}