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 "../../format/video_format.h"\r
  25 #include "../../processor/frame.h"\r
  26 #include "../../processor/composite_frame.h"\r
  27 #include "../../processor/frame_processor_device.h"\r
  28 \r
  29 #include "../../../common/utility/memory.h"\r
  30 #include "../../producer/frame_producer_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) \r
  39                 : current_frame_(0), info_(info), dest_producer_(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_producer_;\r
  48         }\r
  49         \r
  50         void set_leading_producer(const frame_producer_ptr& producer)\r
  51         {\r
  52                 source_producer_ = producer;\r
  53         }\r
  54                 \r
  55         frame_ptr render_frame()\r
  56         {\r
  57                 if(current_frame_ == 0)\r
  58                         CASPAR_LOG(info) << "Transition started.";\r
  59 \r
  60                 frame_ptr result = [&]() -> frame_ptr\r
  61                 {\r
  62                         if(current_frame_++ >= info_.duration)\r
  63                                 return nullptr;\r
  64 \r
  65                         frame_ptr source;\r
  66                         frame_ptr dest;\r
  67 \r
  68                         tbb::parallel_invoke\r
  69                         (\r
  70                                 [&]{dest   = render_frame(dest_producer_);},\r
  71                                 [&]{source = render_frame(source_producer_);}\r
  72                         );\r
  73 \r
  74                         return compose(dest, source);\r
  75                 }();\r
  76 \r
  77                 if(result == nullptr)\r
  78                         CASPAR_LOG(info) << "Transition ended.";\r
  79 \r
  80                 return result;\r
  81         }\r
  82 \r
  83         frame_ptr render_frame(frame_producer_ptr& producer)\r
  84         {\r
  85                 if(producer == nullptr)\r
  86                         return nullptr;\r
  87 \r
  88                 frame_ptr frame;\r
  89                 try\r
  90                 {\r
  91                         frame = producer->render_frame();\r
  92                 }\r
  93                 catch(...)\r
  94                 {\r
  95                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  96                         producer = nullptr;\r
  97                         CASPAR_LOG(warning) << "Removed producer from transition.";\r
  98                 }\r
  99 \r
 100                 if(frame == nullptr)\r
 101                 {\r
 102                         if(producer == nullptr || producer->get_following_producer() == nullptr)\r
 103                                 return nullptr;\r
 104 \r
 105                         try\r
 106                         {\r
 107                                 auto following = producer->get_following_producer();\r
 108                                 following->initialize(frame_processor_);\r
 109                                 following->set_leading_producer(producer);\r
 110                                 producer = following;\r
 111                         }\r
 112                         catch(...)\r
 113                         {\r
 114                                 CASPAR_LOG(warning) << "Failed to initialize following producer. Removing it.";\r
 115                                 producer = nullptr;\r
 116                         }\r
 117 \r
 118                         return render_frame(producer);\r
 119                 }\r
 120                 return frame;\r
 121         }\r
 122                         \r
 123         void set_volume(const frame_ptr& frame, int volume)\r
 124         {\r
 125                 if(!frame)\r
 126                         return;\r
 127 \r
 128                 for(size_t n = 0; n < frame->audio_data().size(); ++n)\r
 129                         frame->audio_data()[n] = static_cast<short>((static_cast<int>(frame->audio_data()[n])*volume)>>8);\r
 130         }\r
 131                 \r
 132         frame_ptr compose(const frame_ptr& dest_frame, frame_ptr src_frame) \r
 133         {       \r
 134                 if(info_.type == transition::cut)               \r
 135                         return src_frame;\r
 136 \r
 137                 if(!dest_frame)\r
 138                         return nullptr;\r
 139                                                                 \r
 140                 double alpha = static_cast<double>(current_frame_)/static_cast<double>(info_.duration);\r
 141                 int volume = static_cast<int>(alpha*256.0);\r
 142                                 \r
 143                 tbb::parallel_invoke\r
 144                 (\r
 145                         [&]{set_volume(dest_frame, volume);},\r
 146                         [&]{set_volume(src_frame, 256-volume);}\r
 147                 );\r
 148                 \r
 149                 if(info_.type == transition::mix)\r
 150                         dest_frame->alpha(alpha);               \r
 151                 else if(info_.type == transition::slide)\r
 152                 {       \r
 153                         if(info_.direction == transition_direction::from_left)                  \r
 154                                 dest_frame->translate(-1.0+alpha, 0.0);                 \r
 155                         else if(info_.direction == transition_direction::from_right)\r
 156                                 dest_frame->translate(1.0-alpha, 0.0);          \r
 157                 }\r
 158                 else if(info_.type == transition::push)\r
 159                 {\r
 160                         if(info_.direction == transition_direction::from_left)          \r
 161                         {\r
 162                                 dest_frame->translate(-1.0+alpha, 0.0);\r
 163                                 if(src_frame)\r
 164                                         src_frame->translate(0.0+alpha, 0.0);\r
 165                         }\r
 166                         else if(info_.direction == transition_direction::from_right)\r
 167                         {\r
 168                                 dest_frame->translate(1.0-alpha, 0.0);\r
 169                                 if(src_frame)\r
 170                                         src_frame->translate(0.0-alpha, 0.0);\r
 171                         }\r
 172                 }\r
 173                 else if(info_.type == transition::wipe)\r
 174                 {\r
 175                         if(info_.direction == transition_direction::from_left)          \r
 176                         {\r
 177                                 dest_frame->translate(-1.0+alpha, 0.0);\r
 178                                 dest_frame->texcoords(-1.0+alpha, 1.0, alpha, 0.0);\r
 179                         }\r
 180                         else if(info_.direction == transition_direction::from_right)\r
 181                         {\r
 182                                 dest_frame->translate(1.0-alpha, 0.0);\r
 183                                 dest_frame->texcoords(1.0-alpha, 1.0, 2.0-alpha, 0.0);\r
 184                         }\r
 185                 }\r
 186                                                 \r
 187                 auto composite = std::make_shared<composite_frame>();\r
 188                 if(src_frame)\r
 189                         composite->add(src_frame);\r
 190                 composite->add(dest_frame);\r
 191                 return composite;\r
 192         }\r
 193                 \r
 194         void initialize(const frame_processor_device_ptr& frame_processor)\r
 195         {\r
 196                 dest_producer_->initialize(frame_processor);\r
 197                 frame_processor_ = frame_processor;\r
 198         }\r
 199         \r
 200         frame_producer_ptr                      source_producer_;\r
 201         frame_producer_ptr                      dest_producer_;\r
 202         \r
 203         unsigned short                          current_frame_;\r
 204         \r
 205         const transition_info           info_;\r
 206         frame_processor_device_ptr      frame_processor_;\r
 207 };\r
 208 \r
 209 transition_producer::transition_producer(const frame_producer_ptr& dest, const transition_info& info) \r
 210         : impl_(new implementation(dest, info)){}\r
 211 frame_ptr transition_producer::render_frame(){return impl_->render_frame();}\r
 212 frame_producer_ptr transition_producer::get_following_producer() const{return impl_->get_following_producer();}\r
 213 void transition_producer::set_leading_producer(const frame_producer_ptr& producer) { impl_->set_leading_producer(producer); }\r
 214 void transition_producer::initialize(const frame_processor_device_ptr& frame_processor) { impl_->initialize(frame_processor);}\r
 215 \r
 216 }}\r
 217 \r