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                 assert(volume >= 0 && volume <= 256);\r
 125                 std::for_each(frame->get_audio_data().begin(), frame->get_audio_data().end(), [&](int16_t& sample)\r
 126                 {\r
 127                         sample = static_cast<short>((static_cast<int>(sample)*volume)>>8);\r
 128                 });\r
 129         }\r
 130                 \r
 131         frame_ptr compose(frame_ptr dest_frame, frame_ptr src_frame) \r
 132         {       \r
 133                 if(!dest_frame && !src_frame)\r
 134                         return nullptr;\r
 135 \r
 136                 if(info_.type == transition::cut)               \r
 137                         return src_frame;\r
 138 \r
 139                 dest_frame = dest_frame ? dest_frame : frame::empty();\r
 140                 src_frame  = src_frame  ? src_frame  : frame::empty();\r
 141                                                                 \r
 142                 double alpha = static_cast<double>(current_frame_)/static_cast<double>(info_.duration);\r
 143                 int volume = static_cast<int>(alpha*256.0);\r
 144                                 \r
 145                 tbb::parallel_invoke\r
 146                 (\r
 147                         [&]{set_volume(dest_frame, volume);},\r
 148                         [&]{set_volume(src_frame, 256-volume);}\r
 149                 );\r
 150 \r
 151                 double dir = info_.direction == transition_direction::from_left ? 1.0 : -1.0;           \r
 152                 \r
 153                 if(info_.type == transition::mix)\r
 154                         dest_frame->get_render_transform().alpha = alpha;               \r
 155                 else if(info_.type == transition::slide)                        \r
 156                         dest_frame->get_render_transform().pos = boost::make_tuple((-1.0+alpha)*dir, 0.0);                      \r
 157                 else if(info_.type == transition::push)\r
 158                 {\r
 159                         dest_frame->get_render_transform().pos = boost::make_tuple((-1.0+alpha)*dir, 0.0);\r
 160                         src_frame->get_render_transform().pos = boost::make_tuple((0.0+alpha)*dir, 0.0);\r
 161                 }\r
 162                 else if(info_.type == transition::wipe)\r
 163                 {\r
 164                         dest_frame->get_render_transform().pos = boost::make_tuple((-1.0+alpha)*dir, 0.0);                      \r
 165                         dest_frame->get_render_transform().uv = boost::make_tuple((-1.0+alpha)*dir, 1.0, 1.0-(1.0-alpha)*dir, 0.0);                             \r
 166                 }\r
 167                                                 \r
 168                 return std::make_shared<composite_frame>(src_frame, dest_frame);\r
 169         }\r
 170                 \r
 171         void initialize(const frame_processor_device_ptr& frame_processor)\r
 172         {\r
 173                 dest_producer_->initialize(frame_processor);\r
 174                 frame_processor_ = frame_processor;\r
 175         }\r
 176         \r
 177         frame_producer_ptr                      source_producer_;\r
 178         frame_producer_ptr                      dest_producer_;\r
 179         \r
 180         unsigned short                          current_frame_;\r
 181         \r
 182         const transition_info           info_;\r
 183         frame_processor_device_ptr      frame_processor_;\r
 184 };\r
 185 \r
 186 transition_producer::transition_producer(const frame_producer_ptr& dest, const transition_info& info) : impl_(new implementation(dest, info)){}\r
 187 frame_ptr transition_producer::render_frame(){return impl_->render_frame();}\r
 188 frame_producer_ptr transition_producer::get_following_producer() const{return impl_->get_following_producer();}\r
 189 void transition_producer::set_leading_producer(const frame_producer_ptr& producer) { impl_->set_leading_producer(producer); }\r
 190 void transition_producer::initialize(const frame_processor_device_ptr& frame_processor) { impl_->initialize(frame_processor);}\r
 191 \r
 192 }}\r
 193 \r