git.sesse.net Git - casparcg/blob - core/producer/layer.cpp

   1 #include "../stdafx.h"\r
   2 \r
   3 #include "layer.h"\r
   4 #include "frame_producer.h"\r
   5 \r
   6 #include <common/concurrency/executor.h>\r
   7 #include <common/exception/exceptions.h>\r
   8 #include <common/utility/assert.h>\r
   9 #include <common/utility/printer.h>\r
  10 \r
  11 #include "../producer/frame/basic_frame.h"\r
  12 #include "../producer/frame/audio_transform.h"\r
  13 \r
  14 #include <tbb/spin_mutex.h>\r
  15 \r
  16 namespace caspar { namespace core {\r
  17 \r
  18 class frame_producer_remover\r
  19 {\r
  20         executor executor_;\r
  21 \r
  22         void do_remove(safe_ptr<frame_producer>& producer)\r
  23         {\r
  24                 auto name = producer->print();\r
  25                 producer = frame_producer::empty();\r
  26                 CASPAR_LOG(info) << name << L" Removed.";\r
  27         }\r
  28 \r
  29 public:\r
  30 \r
  31         frame_producer_remover() : executor_(L"frame_producer_remover")\r
  32         {\r
  33                 executor_.start();\r
  34         }\r
  35 \r
  36         void remove(safe_ptr<frame_producer>&& producer)\r
  37         {\r
  38                 if(producer != frame_producer::empty() && !producer.unique())\r
  39                         CASPAR_LOG(debug) << producer->print() << L" was not destroyed on dedicated destruction thread.";\r
  40                 executor_.begin_invoke(std::bind(&frame_producer_remover::do_remove, this, std::move(producer)));\r
  41         }\r
  42 };\r
  43 \r
  44 frame_producer_remover g_remover;\r
  45 \r
  46 struct layer::implementation : boost::noncopyable\r
  47 {                               \r
  48         mutable tbb::spin_mutex         printer_mutex_;\r
  49         printer                                         parent_printer_;\r
  50         int                                                     index_;\r
  51         \r
  52         safe_ptr<frame_producer>        foreground_;\r
  53         safe_ptr<frame_producer>        background_;\r
  54         safe_ptr<basic_frame>           last_frame_;\r
  55         bool                                            is_paused_;\r
  56 public:\r
  57         implementation(int index, const printer& parent_printer) \r
  58                 : parent_printer_(parent_printer)\r
  59                 , index_(index)\r
  60                 , foreground_(frame_producer::empty())\r
  61                 , background_(frame_producer::empty())\r
  62                 , last_frame_(basic_frame::empty())\r
  63                 , is_paused_(false){}\r
  64         \r
  65         void load(const safe_ptr<frame_producer>& frame_producer, bool play_on_load, bool preview)\r
  66         {               \r
  67                 background_ = frame_producer;\r
  68                 is_paused_ = false;\r
  69 \r
  70                 if(preview)\r
  71                 {\r
  72                         play();\r
  73                         receive();\r
  74                         pause();\r
  75                 }\r
  76 \r
  77                 if(play_on_load)\r
  78                         play();                         \r
  79         }\r
  80 \r
  81         void play()\r
  82         {                       \r
  83                 if(!is_paused_)                 \r
  84                 {\r
  85                         background_->set_leading_producer(foreground_);\r
  86                         foreground_ = background_;\r
  87                         CASPAR_LOG(info) << foreground_->print() << L" Added.";\r
  88                         background_ = frame_producer::empty();\r
  89                 }\r
  90                 is_paused_ = false;\r
  91         }\r
  92 \r
  93         void pause()\r
  94         {\r
  95                 is_paused_ = true;\r
  96         }\r
  97 \r
  98         void stop()\r
  99         {\r
 100                 pause();\r
 101                 last_frame_ = basic_frame::empty();\r
 102                 foreground_ = frame_producer::empty();\r
 103         }\r
 104                 \r
 105         safe_ptr<basic_frame> receive()\r
 106         {               \r
 107                 if(is_paused_)\r
 108                 {\r
 109                         last_frame_->get_audio_transform().set_gain(0.0);\r
 110                         return last_frame_;\r
 111                 }\r
 112 \r
 113                 try\r
 114                 {\r
 115                         last_frame_ = foreground_->receive(); \r
 116                         if(last_frame_ == basic_frame::eof())\r
 117                         {\r
 118                                 CASPAR_VERIFY(foreground_ != frame_producer::empty());\r
 119 \r
 120                                 auto following = foreground_->get_following_producer();\r
 121                                 following->set_leading_producer(foreground_);\r
 122                                 following->set_parent_printer([=]{return print();});\r
 123                                 g_remover.remove(std::move(foreground_));\r
 124                                 foreground_ = following;\r
 125                                 CASPAR_LOG(info) << foreground_->print() << L" Added.";\r
 126 \r
 127                                 last_frame_ = receive();\r
 128                         }\r
 129                 }\r
 130                 catch(...)\r
 131                 {\r
 132                         CASPAR_LOG(error) << print() << L" Unhandled Exception: ";\r
 133                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 134                         stop();\r
 135                 }\r
 136 \r
 137                 return last_frame_;\r
 138         }\r
 139                 \r
 140         std::wstring print() const\r
 141         {\r
 142                 tbb::spin_mutex::scoped_lock lock(printer_mutex_); // Child-producers may call print asynchronously to the producer thread.\r
 143                 return (parent_printer_ ? parent_printer_() + L"/" : L"") + L"layer[" + boost::lexical_cast<std::wstring>(index_) + L"]";\r
 144         }\r
 145 };\r
 146 \r
 147 layer::layer(int index, const printer& parent_printer) : impl_(new implementation(index, parent_printer)){}\r
 148 layer::layer(layer&& other) : impl_(std::move(other.impl_)){}\r
 149 layer& layer::operator=(layer&& other)\r
 150 {\r
 151         impl_ = std::move(other.impl_);\r
 152         return *this;\r
 153 }\r
 154 void layer::swap(layer& other)\r
 155 {\r
 156         impl_.swap(other.impl_);\r
 157         // Printer state is not swapped.\r
 158         tbb::spin_mutex::scoped_lock lock(impl_->printer_mutex_);\r
 159         std::swap(impl_->parent_printer_, other.impl_->parent_printer_);\r
 160         std::swap(impl_->index_, other.impl_->index_);\r
 161 }\r
 162 void layer::load(const safe_ptr<frame_producer>& frame_producer, bool play_on_load, bool preview){return impl_->load(frame_producer, play_on_load, preview);}   \r
 163 void layer::play(){impl_->play();}\r
 164 void layer::pause(){impl_->pause();}\r
 165 void layer::stop(){impl_->stop();}\r
 166 safe_ptr<basic_frame> layer::receive() {return impl_->receive();}\r
 167 safe_ptr<frame_producer> layer::foreground() const { return impl_->foreground_;}\r
 168 safe_ptr<frame_producer> layer::background() const { return impl_->background_;}\r
 169 std::wstring layer::print() const { return impl_->print();}\r
 170 }}