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

   1 /*\r
   2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 *  This file is part of CasparCG.\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 */ \r
  20 #include "../../stdafx.h"\r
  21 \r
  22 #include "transition_producer.h"\r
  23 \r
  24 #include "../../frame/frame_format.h"\r
  25 #include "../../frame/gpu_frame.h"\r
  26 #include "../../frame/gpu_composite_frame.h"\r
  27 #include "../../frame/frame_factory.h"\r
  28 \r
  29 #include "../../../common/utility/memory.h"\r
  30 #include "../../renderer/render_device.h"\r
  31 \r
  32 #include <boost/range/algorithm/copy.hpp>\r
  33 \r
  34 namespace caspar { namespace core {     \r
  35 \r
  36 struct transition_producer::implementation : boost::noncopyable\r
  37 {\r
  38         implementation(const frame_producer_ptr& dest, const transition_info& info, const frame_format_desc& format_desc) \r
  39                 : current_frame_(0), info_(info), format_desc_(format_desc), dest_(dest)\r
  40         {\r
  41                 if(!dest)\r
  42                         BOOST_THROW_EXCEPTION(null_argument() << arg_name_info("dest"));\r
  43         }\r
  44                 \r
  45         frame_producer_ptr get_following_producer() const\r
  46         {\r
  47                 return dest_;\r
  48         }\r
  49         \r
  50         void set_leading_producer(const frame_producer_ptr& producer)\r
  51         {\r
  52                 source_ = producer;\r
  53         }\r
  54                 \r
  55         gpu_frame_ptr get_frame()\r
  56         {\r
  57                 return ++current_frame_ >= info_.duration ? nullptr : compose(get_producer_frame(dest_), get_producer_frame(source_));\r
  58         }\r
  59 \r
  60         gpu_frame_ptr get_producer_frame(frame_producer_ptr& producer)\r
  61         {\r
  62                 if(producer == nullptr)\r
  63                 {       \r
  64                         auto frame = factory_->create_frame(format_desc_);\r
  65                         common::clear(frame->data(), frame->size());\r
  66                         return frame;\r
  67                 }\r
  68 \r
  69                 gpu_frame_ptr frame;\r
  70                 try\r
  71                 {\r
  72                         frame = producer->get_frame();\r
  73                 }\r
  74                 catch(...)\r
  75                 {\r
  76                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  77                         producer = nullptr;\r
  78                         CASPAR_LOG(warning) << "Removed renderer from transition.";\r
  79                 }\r
  80 \r
  81                 if(frame == nullptr && producer != nullptr && producer->get_following_producer() != nullptr)\r
  82                 {\r
  83                         auto following = producer->get_following_producer();\r
  84                         following->initialize(factory_);\r
  85                         following->set_leading_producer(producer);\r
  86                         producer = following;\r
  87                         return get_producer_frame(producer);\r
  88                 }\r
  89                 return frame;\r
  90         }\r
  91                         \r
  92         gpu_frame_ptr compose(const gpu_frame_ptr& dest_frame, const gpu_frame_ptr& src_frame) \r
  93         {       \r
  94                 if(!src_frame)\r
  95                         return dest_frame;\r
  96 \r
  97                 if(info_.type == transition_type::cut || !dest_frame)           \r
  98                         return src_frame;\r
  99                 \r
 100                 int volume = static_cast<int>(static_cast<double>(current_frame_)/static_cast<double>(info_.duration)*256.0);\r
 101                                 \r
 102                 for(size_t n = 0; n < dest_frame->audio_data().size(); ++n)\r
 103                         dest_frame->audio_data()[n] = static_cast<short>((static_cast<int>(dest_frame->audio_data()[n])*volume)>>8);\r
 104 \r
 105                 for(size_t n = 0; n < src_frame->audio_data().size(); ++n)\r
 106                         src_frame->audio_data()[n] = static_cast<short>((static_cast<int>(src_frame->audio_data()[n])*(256-volume))>>8);\r
 107                                 \r
 108                 float alpha = static_cast<float>(current_frame_)/static_cast<float>(info_.duration);\r
 109                 auto composite = std::make_shared<gpu_composite_frame>();\r
 110                 composite->add(src_frame);\r
 111                 composite->add(dest_frame);\r
 112                 if(info_.type == transition_type::mix)\r
 113                 {\r
 114                         src_frame->alpha(1.0f-alpha);\r
 115                         dest_frame->alpha(alpha);\r
 116                 }\r
 117                 else if(info_.type == transition_type::slide)\r
 118                 {\r
 119                         if(info_.direction == transition_direction::from_left)                  \r
 120                                 dest_frame->translate(-1.0f+alpha, 0.0f);                       \r
 121                         else if(info_.direction == transition_direction::from_right)\r
 122                                 dest_frame->translate(1.0f-alpha, 0.0f);                        \r
 123                 }\r
 124                 else if(info_.type == transition_type::push)\r
 125                 {\r
 126                         if(info_.direction == transition_direction::from_left)          \r
 127                         {\r
 128                                 dest_frame->translate(-1.0f+alpha, 0.0f);\r
 129                                 src_frame->translate(0.0f+alpha, 0.0f);\r
 130                         }\r
 131                         else if(info_.direction == transition_direction::from_right)\r
 132                         {\r
 133                                 dest_frame->translate(1.0f-alpha, 0.0f);\r
 134                                 src_frame->translate(0.0f-alpha, 0.0f);\r
 135                         }\r
 136                 }\r
 137                 return composite;\r
 138         }\r
 139                 \r
 140         void initialize(const frame_factory_ptr& factory)\r
 141         {\r
 142                 dest_->initialize(factory);\r
 143                 factory_ = factory;\r
 144         }\r
 145 \r
 146         const frame_format_desc format_desc_;\r
 147 \r
 148         frame_producer_ptr              source_;\r
 149         frame_producer_ptr              dest_;\r
 150         \r
 151         unsigned short                  current_frame_;\r
 152         \r
 153         const transition_info   info_;\r
 154         frame_factory_ptr               factory_;\r
 155 };\r
 156 \r
 157 transition_producer::transition_producer(const frame_producer_ptr& dest, const transition_info& info, const frame_format_desc& format_desc) \r
 158         : impl_(new implementation(dest, info, format_desc)){}\r
 159 gpu_frame_ptr transition_producer::get_frame(){return impl_->get_frame();}\r
 160 frame_producer_ptr transition_producer::get_following_producer() const{return impl_->get_following_producer();}\r
 161 void transition_producer::set_leading_producer(const frame_producer_ptr& producer) { impl_->set_leading_producer(producer); }\r
 162 const frame_format_desc& transition_producer::get_frame_format_desc() const { return impl_->format_desc_; } \r
 163 void transition_producer::initialize(const frame_factory_ptr& factory) { impl_->initialize(factory);}\r
 164 \r
 165 }}\r
 166 \r