git.sesse.net Git - casparcg/blob - modules/ffmpeg/producer/video/video_decoder.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 "video_decoder.h"\r
  23 \r
  24 #include "../util.h"\r
  25 #include "../filter/filter.h"\r
  26 \r
  27 #include "../../ffmpeg_error.h"\r
  28 \r
  29 #include <core/producer/frame/basic_frame.h>\r
  30 #include <common/memory/memcpy.h>\r
  31 #include <common/concurrency/governor.h>\r
  32 \r
  33 #if defined(_MSC_VER)\r
  34 #pragma warning (push)\r
  35 #pragma warning (disable : 4244)\r
  36 #endif\r
  37 extern "C" \r
  38 {\r
  39         #include <libavcodec/avcodec.h>\r
  40         #include <libavformat/avformat.h>\r
  41 }\r
  42 #if defined(_MSC_VER)\r
  43 #pragma warning (pop)\r
  44 #endif\r
  45 \r
  46 #include <tbb/scalable_allocator.h>\r
  47 \r
  48 #undef Yield\r
  49 using namespace Concurrency;\r
  50 \r
  51 namespace caspar { namespace ffmpeg {\r
  52         \r
  53 struct video_decoder::implementation : public Concurrency::agent, boost::noncopyable\r
  54 {       \r
  55         int                                                                             index_;\r
  56         std::shared_ptr<AVCodecContext>                 codec_context_;\r
  57         \r
  58         double                                                                  fps_;\r
  59         int64_t                                                                 nb_frames_;\r
  60 \r
  61         size_t                                                                  width_;\r
  62         size_t                                                                  height_;\r
  63         bool                                                                    is_progressive_;\r
  64         \r
  65         unbounded_buffer<video_decoder::source_element_t>       source_;\r
  66         ITarget<video_decoder::target_element_t>&                       target_;\r
  67 \r
  68         governor                                                                                        governor_;\r
  69         \r
  70 public:\r
  71         explicit implementation(video_decoder::source_t& source, video_decoder::target_t& target, AVFormatContext& context) \r
  72                 : codec_context_(open_codec(context, AVMEDIA_TYPE_VIDEO, index_))\r
  73                 , fps_(static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num))\r
  74                 , nb_frames_(context.streams[index_]->nb_frames)\r
  75                 , width_(codec_context_->width)\r
  76                 , height_(codec_context_->height)\r
  77                 , is_progressive_(true)\r
  78                 , source_([this](const video_decoder::source_element_t& packet){return packet->stream_index == index_;})\r
  79                 , target_(target)\r
  80                 , governor_(1) // IMPORTANT: Must be 1 since avcodec_decode_video2 reuses memory.\r
  81         {               \r
  82                 CASPAR_LOG(debug) << "[video_decoder] " << context.streams[index_]->codec->codec->long_name;\r
  83                 \r
  84                 source.link_target(&source_);\r
  85                 \r
  86                 start();\r
  87         }\r
  88 \r
  89         ~implementation()\r
  90         {\r
  91                 agent::wait(this);\r
  92         }\r
  93         \r
  94         std::shared_ptr<AVFrame> decode(AVPacket& packet)\r
  95         {\r
  96                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
  97 \r
  98                 int frame_finished = 0;\r
  99                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &packet), "[video_decocer]");\r
 100 \r
 101                 // 1 packet <=> 1 frame.\r
 102                 // If a decoder consumes less then the whole packet then something is wrong\r
 103                 // that might be just harmless padding at the end, or a problem with the\r
 104                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 105 \r
 106                 if(frame_finished == 0) \r
 107                         return nullptr;\r
 108                                 \r
 109                 if(decoded_frame->repeat_pict > 0)\r
 110                         CASPAR_LOG(warning) << "[video_decoder]: Field repeat_pict not implemented.";\r
 111 \r
 112                 return decoded_frame;\r
 113         }\r
 114 \r
 115         virtual void run()\r
 116         {\r
 117                 try\r
 118                 {\r
 119                         win32_exception::install_handler();\r
 120                         while(true)\r
 121                         {\r
 122                                 auto ticket = governor_.acquire();\r
 123                                 auto packet = receive(source_);\r
 124                         \r
 125                                 if(packet == loop_packet(index_))\r
 126                                 {                                       \r
 127                                         if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
 128                                         {\r
 129                                                 AVPacket pkt;\r
 130                                                 av_init_packet(&pkt);\r
 131                                                 pkt.data = nullptr;\r
 132                                                 pkt.size = 0;\r
 133 \r
 134                                                 for(auto decoded_frame = decode(pkt); decoded_frame; decoded_frame = decode(pkt))\r
 135                                                 {                                               \r
 136                                                         send(target_, safe_ptr<AVFrame>(decoded_frame.get(), [decoded_frame, ticket](AVFrame*){}));\r
 137                                                         Context::Yield();\r
 138                                                 }\r
 139                                         }\r
 140 \r
 141                                         avcodec_flush_buffers(codec_context_.get());\r
 142                                         send(target_, loop_video());\r
 143                                         continue;\r
 144                                 }\r
 145 \r
 146                                 if(packet == eof_packet(index_))\r
 147                                         break;\r
 148 \r
 149                                 auto decoded_frame = decode(*packet);\r
 150                                 if(!decoded_frame)\r
 151                                         continue;\r
 152                 \r
 153                                 is_progressive_ = decoded_frame->interlaced_frame == 0;\r
 154                                 \r
 155                                 // C-TODO: Avoid duplication.\r
 156                                 // Need to dupliace frame data since avcodec_decode_video2 reuses it.\r
 157                                 send(target_, safe_ptr<AVFrame>(decoded_frame.get(), [decoded_frame, ticket](AVFrame*){}));                             \r
 158                                 Context::Yield();\r
 159                         }\r
 160                 }\r
 161                 catch(...)\r
 162                 {\r
 163                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 164                 }\r
 165                 \r
 166                 send(target_, eof_video());\r
 167 \r
 168                 done();\r
 169         }\r
 170                         \r
 171         double fps() const\r
 172         {\r
 173                 return fps_;\r
 174         }\r
 175 };\r
 176 \r
 177 video_decoder::video_decoder(video_decoder::source_t& source, video_decoder::target_t& target, AVFormatContext& context) \r
 178         : impl_(new implementation(source, target, context))\r
 179 {\r
 180 }\r
 181 \r
 182 double video_decoder::fps() const{return impl_->fps();}\r
 183 int64_t video_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 184 size_t video_decoder::width() const{return impl_->width_;}\r
 185 size_t video_decoder::height() const{return impl_->height_;}\r
 186 bool video_decoder::is_progressive() const{return impl_->is_progressive_;}\r
 187 \r
 188 }}