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 #include "../util.h"\r
  24 #include "../filter/filter.h"\r
  25 \r
  26 #include "../../ffmpeg_error.h"\r
  27 #include "../../tbb_avcodec.h"\r
  28 \r
  29 #include <common/memory/memcpy.h>\r
  30 \r
  31 #include <core/video_format.h>\r
  32 #include <core/producer/frame/basic_frame.h>\r
  33 #include <core/mixer/write_frame.h>\r
  34 #include <core/producer/frame/image_transform.h>\r
  35 #include <core/producer/frame/frame_factory.h>\r
  36 #include <core/producer/color/color_producer.h>\r
  37 \r
  38 #include <tbb/task_group.h>\r
  39 \r
  40 #include <boost/range/algorithm_ext.hpp>\r
  41 \r
  42 #if defined(_MSC_VER)\r
  43 #pragma warning (push)\r
  44 #pragma warning (disable : 4244)\r
  45 #endif\r
  46 extern "C" \r
  47 {\r
  48         #define __STDC_CONSTANT_MACROS\r
  49         #define __STDC_LIMIT_MACROS\r
  50         #include <libavformat/avformat.h>\r
  51         #include <libavcodec/avcodec.h>\r
  52 }\r
  53 #if defined(_MSC_VER)\r
  54 #pragma warning (pop)\r
  55 #endif\r
  56 \r
  57 namespace caspar {\r
  58                 \r
  59 struct video_decoder::implementation : boost::noncopyable\r
  60 {\r
  61         const safe_ptr<core::frame_factory>             frame_factory_;\r
  62         std::shared_ptr<AVCodecContext>                 codec_context_;\r
  63         int                                                                             index_;\r
  64         core::video_mode::type                                  mode_;\r
  65 \r
  66         std::queue<std::shared_ptr<AVPacket>>   packet_buffer_;\r
  67 \r
  68         std::unique_ptr<filter>                                 filter_;\r
  69 \r
  70         double                                                                  fps_;\r
  71 public:\r
  72         explicit implementation(const std::shared_ptr<AVFormatContext>& context, const safe_ptr<core::frame_factory>& frame_factory, const std::wstring& filter) \r
  73                 : frame_factory_(frame_factory)\r
  74                 , mode_(core::video_mode::invalid)\r
  75                 , filter_(filter.empty() ? nullptr : new caspar::filter(filter))\r
  76                 , fps_(frame_factory_->get_video_format_desc().fps)\r
  77         {\r
  78                 AVCodec* dec;\r
  79                 index_ = av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0);\r
  80 \r
  81                 if(index_ < 0)\r
  82                         return;\r
  83                         \r
  84                 int errn = tbb_avcodec_open(context->streams[index_]->codec, dec);\r
  85                 if(errn < 0)\r
  86                         return;\r
  87                                 \r
  88                 codec_context_.reset(context->streams[index_]->codec, tbb_avcodec_close);\r
  89 \r
  90                 // Some files give an invalid time_base numerator, try to fix it.\r
  91                 if(codec_context_ && codec_context_->time_base.num == 1)\r
  92                         codec_context_->time_base.num = static_cast<int>(std::pow(10.0, static_cast<int>(std::log10(static_cast<float>(codec_context_->time_base.den)))-1));    \r
  93 \r
  94                 fps_ = static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num);\r
  95                 if(double_rate(filter))\r
  96                         fps_ *= 2;\r
  97         }\r
  98 \r
  99         void push(const std::shared_ptr<AVPacket>& packet)\r
 100         {\r
 101                 if(!codec_context_)\r
 102                         return;\r
 103 \r
 104                 if(packet && packet->stream_index != index_)\r
 105                         return;\r
 106 \r
 107                 packet_buffer_.push(packet);\r
 108         }\r
 109 \r
 110         std::vector<std::shared_ptr<core::write_frame>> poll()\r
 111         {               \r
 112                 std::vector<std::shared_ptr<core::write_frame>> result;\r
 113 \r
 114                 if(!codec_context_)\r
 115                         result.push_back(make_safe<core::write_frame>(this));\r
 116                 else if(!packet_buffer_.empty())\r
 117                 {\r
 118                         std::shared_ptr<AVFrame> frame;\r
 119 \r
 120                         auto packet = std::move(packet_buffer_.front());\r
 121                 \r
 122                         if(packet)\r
 123                         {\r
 124                                 frame = decode(*packet);                                        \r
 125                                 packet_buffer_.pop();\r
 126                         }\r
 127                         else\r
 128                         {\r
 129                                 if(codec_context_->codec->capabilities | CODEC_CAP_DELAY)\r
 130                                 {\r
 131                                         AVPacket pkt = {0};\r
 132                                         frame = decode(pkt);\r
 133                                 }\r
 134 \r
 135                                 if(!frame)\r
 136                                 {                                       \r
 137                                         packet_buffer_.pop();\r
 138                                         avcodec_flush_buffers(codec_context_.get());\r
 139                                 }\r
 140                         }\r
 141 \r
 142                         std::vector<safe_ptr<AVFrame>> av_frames;\r
 143 \r
 144                         if(filter_)                     \r
 145                                 av_frames = filter_->execute(frame);                    \r
 146                         else if(frame)\r
 147                                 av_frames.push_back(make_safe(frame));\r
 148                                                 \r
 149                         BOOST_FOREACH(auto& frame, av_frames)\r
 150                                 result.push_back(make_write_frame(this, frame, frame_factory_));\r
 151 \r
 152                         if(!packet)\r
 153                                 result.push_back(nullptr);\r
 154                 }\r
 155                 \r
 156                 return result;\r
 157         }\r
 158 \r
 159         std::shared_ptr<AVFrame> decode(AVPacket& packet)\r
 160         {\r
 161                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 162 \r
 163                 int frame_finished = 0;\r
 164                 const int errn = avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &packet);\r
 165                 \r
 166                 if(errn < 0)\r
 167                 {\r
 168                         BOOST_THROW_EXCEPTION(\r
 169                                 invalid_operation() <<\r
 170                                 msg_info(av_error_str(errn)) <<\r
 171                                 boost::errinfo_api_function("avcodec_decode_video") <<\r
 172                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 173                 }\r
 174 \r
 175                 if(frame_finished != 0) \r
 176                 {\r
 177                         return decoded_frame;\r
 178                         if(decoded_frame->repeat_pict != 0)\r
 179                                 CASPAR_LOG(warning) << "video_decoder: repeat_pict not implemented.";\r
 180                 }\r
 181 \r
 182                 return nullptr;\r
 183         }\r
 184         \r
 185         bool ready() const\r
 186         {\r
 187                 return !codec_context_ || !packet_buffer_.empty();\r
 188         }\r
 189         \r
 190         core::video_mode::type mode()\r
 191         {\r
 192                 if(!codec_context_)\r
 193                         return frame_factory_->get_video_format_desc().mode;\r
 194 \r
 195                 return mode_;\r
 196         }\r
 197 \r
 198         double fps() const\r
 199         {\r
 200                 return fps_;\r
 201         }\r
 202 };\r
 203 \r
 204 video_decoder::video_decoder(const std::shared_ptr<AVFormatContext>& context, const safe_ptr<core::frame_factory>& frame_factory, const std::wstring& filter) : impl_(new implementation(context, frame_factory, filter)){}\r
 205 void video_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 206 std::vector<std::shared_ptr<core::write_frame>> video_decoder::poll(){return impl_->poll();}\r
 207 bool video_decoder::ready() const{return impl_->ready();}\r
 208 core::video_mode::type video_decoder::mode(){return impl_->mode();}\r
 209 double video_decoder::fps() const{return impl_->fps();}\r
 210 }