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                 CASPAR_VERIFY(producer == frame_producer::empty() || producer.unique());\r
  39                 executor_.begin_invoke(std::bind(&frame_producer_remover::do_remove, this, std::move(producer)));\r
  40         }\r
  41 };\r
  42 \r
  43 frame_producer_remover g_remover;\r
  44 \r
  45 struct layer::implementation : boost::noncopyable\r
  46 {                               \r
  47         mutable tbb::spin_mutex         printer_mutex_;\r
  48         printer                                         parent_printer_;\r
  49         int                                                     index_;\r
  50         \r
  51         safe_ptr<frame_producer>        foreground_;\r
  52         safe_ptr<frame_producer>        background_;\r
  53         safe_ptr<basic_frame>           last_frame_;\r
  54         bool                                            is_paused_;\r
  55 public:\r
  56         implementation(int index, const printer& parent_printer) \r
  57                 : parent_printer_(parent_printer)\r
  58                 , index_(index)\r
  59                 , foreground_(frame_producer::empty())\r
  60                 , background_(frame_producer::empty())\r
  61                 , last_frame_(basic_frame::empty())\r
  62                 , is_paused_(false){}\r
  63         \r
  64         void load(const safe_ptr<frame_producer>& frame_producer, bool play_on_load, bool preview)\r
  65         {               \r
  66                 background_ = frame_producer;\r
  67                 is_paused_ = false;\r
  68 \r
  69                 if(preview)\r
  70                 {\r
  71                         play();\r
  72                         receive();\r
  73                         pause();\r
  74                 }\r
  75 \r
  76                 if(play_on_load)\r
  77                         play();                         \r
  78         }\r
  79 \r
  80         void play()\r
  81         {                       \r
  82                 if(!is_paused_)                 \r
  83                 {\r
  84                         background_->set_leading_producer(foreground_);\r
  85                         foreground_ = background_;\r
  86                         CASPAR_LOG(info) << foreground_->print() << L" Added.";\r
  87                         background_ = frame_producer::empty();\r
  88                 }\r
  89                 is_paused_ = false;\r
  90         }\r
  91 \r
  92         void pause()\r
  93         {\r
  94                 is_paused_ = true;\r
  95         }\r
  96 \r
  97         void stop()\r
  98         {\r
  99                 pause();\r
 100                 last_frame_ = basic_frame::empty();\r
 101                 foreground_ = frame_producer::empty();\r
 102         }\r
 103                 \r
 104         safe_ptr<basic_frame> receive()\r
 105         {               \r
 106                 if(is_paused_)\r
 107                 {\r
 108                         last_frame_->get_audio_transform().set_gain(0.0);\r
 109                         return last_frame_;\r
 110                 }\r
 111 \r
 112                 try\r
 113                 {\r
 114                         last_frame_ = foreground_->receive(); \r
 115                         if(last_frame_ == basic_frame::eof())\r
 116                         {\r
 117                                 CASPAR_VERIFY(foreground_ != frame_producer::empty());\r
 118 \r
 119                                 auto following = foreground_->get_following_producer();\r
 120                                 following->set_leading_producer(foreground_);\r
 121                                 following->set_parent_printer([=]{return print();});\r
 122                                 g_remover.remove(std::move(foreground_));\r
 123                                 foreground_ = following;\r
 124                                 CASPAR_LOG(info) << foreground_->print() << L" Added.";\r
 125 \r
 126                                 last_frame_ = receive();\r
 127                         }\r
 128                 }\r
 129                 catch(...)\r
 130                 {\r
 131                         CASPAR_LOG(error) << print() << L" Unhandled Exception: ";\r
 132                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 133                         stop();\r
 134                 }\r
 135 \r
 136                 return last_frame_;\r
 137         }\r
 138                 \r
 139         std::wstring print() const\r
 140         {\r
 141                 tbb::spin_mutex::scoped_lock lock(printer_mutex_); // Child-producers may call print asynchronously to the producer thread.\r
 142                 return (parent_printer_ ? parent_printer_() + L"/" : L"") + L"layer[" + boost::lexical_cast<std::wstring>(index_) + L"]";\r
 143         }\r
 144 };\r
 145 \r
 146 layer::layer(int index, const printer& parent_printer) : impl_(new implementation(index, parent_printer)){}\r
 147 layer::layer(layer&& other) : impl_(std::move(other.impl_)){}\r
 148 layer& layer::operator=(layer&& other)\r
 149 {\r
 150         impl_ = std::move(other.impl_);\r
 151         return *this;\r
 152 }\r
 153 void layer::swap(layer& other)\r
 154 {\r
 155         impl_.swap(other.impl_);\r
 156         // Printer state is not swapped.\r
 157         tbb::spin_mutex::scoped_lock lock(impl_->printer_mutex_);\r
 158         std::swap(impl_->parent_printer_, other.impl_->parent_printer_);\r
 159         std::swap(impl_->index_, other.impl_->index_);\r
 160 }\r
 161 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
 162 void layer::play(){impl_->play();}\r
 163 void layer::pause(){impl_->pause();}\r
 164 void layer::stop(){impl_->stop();}\r
 165 safe_ptr<basic_frame> layer::receive() {return impl_->receive();}\r
 166 safe_ptr<frame_producer> layer::foreground() const { return impl_->foreground_;}\r
 167 safe_ptr<frame_producer> layer::background() const { return impl_->background_;}\r
 168 std::wstring layer::print() const { return impl_->print();}\r
 169 }}