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 "../video_format.h"\r
   7 \r
   8 #include <common/concurrency/executor.h>\r
   9 #include <common/utility/assert.h>\r
  10 #include <common/utility/printer.h>\r
  11 \r
  12 #include "../producer/frame/basic_frame.h"\r
  13 #include "../producer/frame/audio_transform.h"\r
  14 \r
  15 #include <tbb/spin_mutex.h>\r
  16 \r
  17 namespace caspar { namespace core {\r
  18 \r
  19 class frame_producer_remover\r
  20 {\r
  21         executor executor_;\r
  22         tbb::atomic<int> count_;\r
  23 \r
  24         void do_remove(safe_ptr<frame_producer>& producer)\r
  25         {\r
  26                 auto name = producer->print();\r
  27                 producer = frame_producer::empty();\r
  28                 CASPAR_LOG(info) << name << L" Removed.";\r
  29         }\r
  30 public:\r
  31 \r
  32         frame_producer_remover()\r
  33         {\r
  34                 executor_.start();\r
  35                 count_ = 0;\r
  36         }\r
  37 \r
  38         void remove(safe_ptr<frame_producer>&& producer)\r
  39         {\r
  40                 CASPAR_VERIFY(producer.unique());\r
  41                 executor_.begin_invoke(std::bind(&frame_producer_remover::do_remove, this, std::move(producer)));\r
  42         }\r
  43 };\r
  44 \r
  45 frame_producer_remover g_remover;\r
  46 \r
  47 \r
  48 struct layer::implementation : boost::noncopyable\r
  49 {                               \r
  50         mutable tbb::spin_mutex         printer_mutex_;\r
  51         printer                                         parent_printer_;\r
  52         int                                                     index_;\r
  53         \r
  54         safe_ptr<frame_producer>        foreground_;\r
  55         safe_ptr<frame_producer>        background_;\r
  56         safe_ptr<basic_frame>           last_frame_;\r
  57         bool                                            is_paused_;\r
  58 public:\r
  59         implementation(int index, const printer& parent_printer) \r
  60                 : parent_printer_(parent_printer)\r
  61                 , index_(index)\r
  62                 , foreground_(frame_producer::empty())\r
  63                 , background_(frame_producer::empty())\r
  64                 , last_frame_(basic_frame::empty())\r
  65                 , is_paused_(false){}\r
  66         \r
  67         void load(const safe_ptr<frame_producer>& frame_producer, bool play_on_load, bool preview)\r
  68         {               \r
  69                 background_ = frame_producer;\r
  70                 is_paused_ = false;\r
  71 \r
  72                 if(preview)\r
  73                 {\r
  74                         play();\r
  75                         receive();\r
  76                         pause();\r
  77                 }\r
  78 \r
  79                 if(play_on_load)\r
  80                         play();                         \r
  81         }\r
  82 \r
  83         void play()\r
  84         {                       \r
  85                 if(!is_paused_)                 \r
  86                 {\r
  87                         background_->set_leading_producer(foreground_);\r
  88                         foreground_ = background_;\r
  89                         CASPAR_LOG(info) << foreground_->print() << L" Added.";\r
  90                         background_ = frame_producer::empty();\r
  91                 }\r
  92                 is_paused_ = false;\r
  93         }\r
  94 \r
  95         void pause()\r
  96         {\r
  97                 is_paused_ = true;\r
  98         }\r
  99 \r
 100         void stop()\r
 101         {\r
 102                 pause();\r
 103                 last_frame_ = basic_frame::empty();\r
 104                 foreground_ = frame_producer::empty();\r
 105         }\r
 106                 \r
 107         safe_ptr<basic_frame> receive()\r
 108         {               \r
 109                 if(is_paused_)\r
 110                 {\r
 111                         last_frame_->get_audio_transform().set_gain(0.0);\r
 112                         return last_frame_;\r
 113                 }\r
 114 \r
 115                 try\r
 116                 {\r
 117                         last_frame_ = foreground_->receive(); \r
 118                         if(last_frame_ == basic_frame::eof())\r
 119                         {\r
 120                                 CASPAR_VERIFY(foreground_ != frame_producer::empty());\r
 121 \r
 122                                 auto following = foreground_->get_following_producer();\r
 123                                 following->set_leading_producer(foreground_);\r
 124                                 following->set_parent_printer(boost::bind(&implementation::print, this));\r
 125                                 g_remover.remove(std::move(foreground_));\r
 126                                 foreground_ = following;\r
 127                                 CASPAR_LOG(info) << foreground_->print() << L" Added.";\r
 128 \r
 129                                 last_frame_ = receive();\r
 130                         }\r
 131                 }\r
 132                 catch(...)\r
 133                 {\r
 134                         CASPAR_LOG(error) << print() << L" Unhandled Exception: ";\r
 135                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 136                         stop();\r
 137                 }\r
 138 \r
 139                 return last_frame_;\r
 140         }\r
 141                 \r
 142         std::wstring print() const\r
 143         {\r
 144                 tbb::spin_mutex::scoped_lock lock(printer_mutex_); // Child-producers may call print asynchronously to the producer thread.\r
 145                 return (parent_printer_ ? parent_printer_() + L"/" : L"") + L"layer[" + boost::lexical_cast<std::wstring>(index_) + L"]";\r
 146         }\r
 147 };\r
 148 \r
 149 layer::layer(int index, const printer& parent_printer) : impl_(new implementation(index, parent_printer)){}\r
 150 layer::layer(layer&& other) : impl_(std::move(other.impl_)){}\r
 151 layer& layer::operator=(layer&& other)\r
 152 {\r
 153         impl_ = std::move(other.impl_);\r
 154         return *this;\r
 155 }\r
 156 void layer::swap(layer& other)\r
 157 {\r
 158         impl_.swap(other.impl_);\r
 159         // Printer state is not swapped.\r
 160         tbb::spin_mutex::scoped_lock lock(impl_->printer_mutex_);\r
 161         std::swap(impl_->parent_printer_, other.impl_->parent_printer_);\r
 162         std::swap(impl_->index_, other.impl_->index_);\r
 163 }\r
 164 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
 165 void layer::play(){impl_->play();}\r
 166 void layer::pause(){impl_->pause();}\r
 167 void layer::stop(){impl_->stop();}\r
 168 safe_ptr<basic_frame> layer::receive() {return impl_->receive();}\r
 169 safe_ptr<frame_producer> layer::foreground() const { return impl_->foreground_;}\r
 170 safe_ptr<frame_producer> layer::background() const { return impl_->background_;}\r
 171 std::wstring layer::print() const { return impl_->print();}\r
 172 }}