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         {\r
  77                 AVCodec* dec;\r
  78                 index_ = av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0);\r
  79 \r
  80                 if(index_ < 0)\r
  81                         return;\r
  82                         \r
  83                 int errn = tbb_avcodec_open(context->streams[index_]->codec, dec);\r
  84                 if(errn < 0)\r
  85                         return;\r
  86                                 \r
  87                 codec_context_.reset(context->streams[index_]->codec, tbb_avcodec_close);\r
  88 \r
  89                 // Some files give an invalid time_base numerator, try to fix it.\r
  90                 if(codec_context_ && codec_context_->time_base.num == 1)\r
  91                         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
  92 \r
  93                 fps_ = static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num);\r
  94                 //if(double_rate(filter))\r
  95                 //      fps_ *= 2;\r
  96         }\r
  97                 \r
  98         void push(const std::shared_ptr<AVPacket>& packet)\r
  99         {\r
 100                 if(!codec_context_)\r
 101                         return;\r
 102 \r
 103                 if(packet && packet->stream_index != index_)\r
 104                         return;\r
 105 \r
 106                 packet_buffer_.push(packet);\r
 107         }\r
 108 \r
 109         std::vector<safe_ptr<core::write_frame>> poll()\r
 110         {               \r
 111                 std::vector<safe_ptr<core::write_frame>> result;\r
 112 \r
 113                 if(!codec_context_)\r
 114                         result.push_back(make_safe<core::write_frame>());\r
 115                 else if(!packet_buffer_.empty())\r
 116                 {\r
 117                         auto packet = std::move(packet_buffer_.front());\r
 118                         packet_buffer_.pop();\r
 119                 \r
 120                         if(!packet) // eof\r
 121                         {                               \r
 122                                 if(codec_context_->codec->capabilities | CODEC_CAP_DELAY)\r
 123                                 {\r
 124                                         // FIXME: This might cause bad performance.\r
 125                                         AVPacket pkt = {0};\r
 126                                         auto frame = decode_frame(pkt);\r
 127                                         if(frame)\r
 128                                                 result.push_back(make_write_frame(this, make_safe(frame), frame_factory_));\r
 129                                 }\r
 130 \r
 131                                 avcodec_flush_buffers(codec_context_.get());\r
 132                         }\r
 133                         else\r
 134                         {\r
 135                                 auto frame = decode_frame(*packet);\r
 136                                 if(frame)\r
 137                                 {\r
 138                                         auto frame2 = make_write_frame(this, make_safe(frame), frame_factory_); \r
 139                                         mode_ = frame2->get_type();\r
 140                                         result.push_back(std::move(frame2));\r
 141                                 }\r
 142                         }\r
 143                 }\r
 144                 \r
 145                 return result;\r
 146         }\r
 147 \r
 148         std::shared_ptr<AVFrame> decode_frame(AVPacket& packet)\r
 149         {\r
 150                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 151 \r
 152                 int frame_finished = 0;\r
 153                 const int errn = avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &packet);\r
 154                 \r
 155                 if(errn < 0)\r
 156                 {\r
 157                         BOOST_THROW_EXCEPTION(\r
 158                                 invalid_operation() <<\r
 159                                 msg_info(av_error_str(errn)) <<\r
 160                                 boost::errinfo_api_function("avcodec_decode_video") <<\r
 161                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 162                 }\r
 163 \r
 164                 if(frame_finished == 0) \r
 165                         decoded_frame.reset();\r
 166 \r
 167                 return decoded_frame;\r
 168         }\r
 169 \r
 170         bool ready() const\r
 171         {\r
 172                 return !codec_context_ || !packet_buffer_.empty();\r
 173         }\r
 174         \r
 175         core::video_mode::type mode()\r
 176         {\r
 177                 if(!codec_context_)\r
 178                         return frame_factory_->get_video_format_desc().mode;\r
 179 \r
 180                 return mode_;\r
 181         }\r
 182 \r
 183         double fps() const\r
 184         {\r
 185                 return fps_;\r
 186         }\r
 187 };\r
 188 \r
 189 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
 190 void video_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 191 std::vector<safe_ptr<core::write_frame>> video_decoder::poll(){return impl_->poll();}\r
 192 bool video_decoder::ready() const{return impl_->ready();}\r
 193 core::video_mode::type video_decoder::mode(){return impl_->mode();}\r
 194 double video_decoder::fps() const{return impl_->fps();}\r
 195 }