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 #include "../../tbb_avcodec.h"\r
  29 \r
  30 #include <core/producer/frame/basic_frame.h>\r
  31 \r
  32 #if defined(_MSC_VER)\r
  33 #pragma warning (push)\r
  34 #pragma warning (disable : 4244)\r
  35 #endif\r
  36 extern "C" \r
  37 {\r
  38         #include <libavcodec/avcodec.h>\r
  39         #include <libavformat/avformat.h>\r
  40 }\r
  41 #if defined(_MSC_VER)\r
  42 #pragma warning (pop)\r
  43 #endif\r
  44 \r
  45 namespace caspar { namespace ffmpeg {\r
  46         \r
  47 struct video_decoder::implementation : public Concurrency::agent, boost::noncopyable\r
  48 {\r
  49         video_decoder::source_t&                                source_;\r
  50         video_decoder::forward_t&                               forward_;\r
  51         video_decoder::target_t&                                target_;\r
  52 \r
  53         std::shared_ptr<AVCodecContext>                 codec_context_;\r
  54         int                                                                             index_;\r
  55 \r
  56         filter                                                                  filter_;\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 public:\r
  66         explicit implementation(video_decoder::source_t& source,\r
  67                                                         video_decoder::forward_t& forward,\r
  68                                                         video_decoder::target_t& target,\r
  69                                                         const safe_ptr<AVFormatContext>& context,\r
  70                                                         double fps,\r
  71                                                         const std::wstring& filter) \r
  72                 : source_(source)\r
  73                 , forward_(forward)\r
  74                 , target_(target)\r
  75                 , filter_(filter.empty() ? L"copy" : filter)\r
  76                 , fps_(fps)\r
  77                 , nb_frames_(0)\r
  78                 , width_(0)\r
  79                 , height_(0)\r
  80                 , is_progressive_(true)\r
  81         {\r
  82                 try\r
  83                 {\r
  84                         AVCodec* dec;\r
  85                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0), "[video_decoder]");\r
  86                                                 \r
  87                         THROW_ON_ERROR2(tbb_avcodec_open(context->streams[index_]->codec, dec), "[video_decoder]");\r
  88                                                                 \r
  89                         codec_context_.reset(context->streams[index_]->codec, tbb_avcodec_close);\r
  90                 \r
  91                         CASPAR_LOG(debug) << "[video_decoder] " << context->streams[index_]->codec->codec->long_name;\r
  92 \r
  93                         // Some files give an invalid time_base numerator, try to fix it.\r
  94 \r
  95                         fix_meta_data(*context);\r
  96                         \r
  97                         fps_ = static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num);\r
  98                         nb_frames_ = context->streams[index_]->nb_frames;\r
  99 \r
 100                         if(double_rate(filter))\r
 101                                 fps_ *= 2;\r
 102 \r
 103                         width_  = codec_context_->width;\r
 104                         height_ = codec_context_->height;\r
 105                 }\r
 106                 catch(...)\r
 107                 {\r
 108                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_AUDIO, -1, -1, nullptr, 0), "[video_decoder]");\r
 109 \r
 110                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 111                         CASPAR_LOG(warning) << "[video_decoder] Failed to open video-stream. Running without video.";   \r
 112                 }\r
 113 \r
 114                 start();\r
 115         }\r
 116         \r
 117         ~implementation()\r
 118         {\r
 119                 agent::wait(this);\r
 120         }\r
 121         \r
 122         virtual void run()\r
 123         {\r
 124                 try\r
 125                 {\r
 126                         while(true)\r
 127                         {\r
 128                                 auto packet = Concurrency::receive(source_);\r
 129 \r
 130                                 if(packet == eof_packet() || packet == loop_packet() || packet->stream_index != index_)\r
 131                                         Concurrency::send(forward_, packet);\r
 132                                 \r
 133                                 if(packet == eof_packet())                              \r
 134                                         break;\r
 135                                                                 \r
 136                                 if(packet == loop_packet())\r
 137                                 {       \r
 138                                         if(codec_context_)\r
 139                                         {\r
 140                                                 if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
 141                                                 {\r
 142                                                         AVPacket pkt;\r
 143                                                         av_init_packet(&pkt);\r
 144                                                         pkt.data = nullptr;\r
 145                                                         pkt.size = 0;\r
 146                                 \r
 147                                                         BOOST_FOREACH(auto& frame1, decode(pkt))\r
 148                                                         {\r
 149                                                                 BOOST_FOREACH(auto& frame2, filter_.execute(frame1))\r
 150                                                                         Concurrency::send(target_, std::shared_ptr<AVFrame>(frame2));\r
 151                                                         }       \r
 152                                                 }\r
 153 \r
 154                                                 avcodec_flush_buffers(codec_context_.get());\r
 155                                         }\r
 156                                         \r
 157                                         Concurrency::send(target_, loop_video());       \r
 158                                 }\r
 159                                 else if(packet->stream_index == index_)\r
 160                                 {\r
 161                                         if(!codec_context_)\r
 162                                         {\r
 163                                                 Concurrency::send(target_, empty_video());      \r
 164                                         }\r
 165                                         else\r
 166                                         {\r
 167                                                 while(packet->size > 0)\r
 168                                                 {\r
 169                                                         BOOST_FOREACH(auto& frame1, decode(*packet))\r
 170                                                         {\r
 171                                                                 BOOST_FOREACH(auto& frame2, filter_.execute(frame1))\r
 172                                                                         Concurrency::send(target_, std::shared_ptr<AVFrame>(frame2));\r
 173                                                         }\r
 174                                                 }\r
 175                                         }\r
 176                                 }\r
 177                         }\r
 178                 }\r
 179                 catch(...)\r
 180                 {\r
 181                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 182                 }\r
 183                 \r
 184                 Concurrency::send(target_, eof_video());\r
 185                                 \r
 186                 done();\r
 187         }\r
 188 \r
 189         std::vector<std::shared_ptr<AVFrame>> decode(AVPacket& pkt)\r
 190         {\r
 191                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 192 \r
 193                 int frame_finished = 0;\r
 194                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &pkt), "[video_decocer]");\r
 195                 \r
 196                 // If a decoder consumes less then the whole packet then something is wrong\r
 197                 // that might be just harmless padding at the end, or a problem with the\r
 198                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 199                 pkt.data = nullptr;\r
 200                 pkt.size = 0;\r
 201 \r
 202                 if(frame_finished == 0) \r
 203                         return std::vector<std::shared_ptr<AVFrame>>();\r
 204 \r
 205                 if(decoded_frame->repeat_pict % 2 > 0)\r
 206                         CASPAR_LOG(warning) << "[video_decoder]: Field repeat_pict not implemented.";\r
 207                 \r
 208                 is_progressive_ = decoded_frame->interlaced_frame == 0;\r
 209 \r
 210                 return std::vector<std::shared_ptr<AVFrame>>(1 + decoded_frame->repeat_pict/2, decoded_frame);\r
 211         }\r
 212                 \r
 213         double fps() const\r
 214         {\r
 215                 return fps_;\r
 216         }\r
 217 };\r
 218 \r
 219 video_decoder::video_decoder(source_t& source,\r
 220                                                          forward_t& forward,\r
 221                                                          target_t& target,\r
 222                                                          const safe_ptr<AVFormatContext>& context, \r
 223                                                          double fps, \r
 224                                                          const std::wstring& filter) \r
 225         : impl_(new implementation(source, forward, target, context, fps, filter))\r
 226 {\r
 227 }\r
 228 \r
 229 double video_decoder::fps() const{return impl_->fps();}\r
 230 int64_t video_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 231 size_t video_decoder::width() const{return impl_->width_;}\r
 232 size_t video_decoder::height() const{return impl_->height_;}\r
 233 bool video_decoder::is_progressive() const{return impl_->is_progressive_;}\r
 234 \r
 235 }}