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