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         int64_t                                                                 nb_frames_;\r
  72 public:\r
  73         explicit implementation(const std::shared_ptr<AVFormatContext>& context, const safe_ptr<core::frame_factory>& frame_factory, const std::wstring& filter) \r
  74                 : frame_factory_(frame_factory)\r
  75                 , mode_(core::video_mode::invalid)\r
  76                 , filter_(filter.empty() ? nullptr : new caspar::filter(filter))\r
  77                 , fps_(frame_factory_->get_video_format_desc().fps)\r
  78                 , nb_frames_(0)\r
  79         {\r
  80                 AVCodec* dec;\r
  81                 index_ = av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0);\r
  82 \r
  83                 if(index_ < 0)\r
  84                         return;\r
  85                         \r
  86                 int errn = tbb_avcodec_open(context->streams[index_]->codec, dec);\r
  87                 if(errn < 0)\r
  88                         return;\r
  89                                 \r
  90                 codec_context_.reset(context->streams[index_]->codec, tbb_avcodec_close);\r
  91                 \r
  92                 // Some files give an invalid time_base numerator, try to fix it.\r
  93                 if(codec_context_ && codec_context_->time_base.num == 1)\r
  94                         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
  95                 \r
  96                 nb_frames_ = context->streams[index_]->nb_frames;\r
  97                 if(nb_frames_ == 0)\r
  98                         nb_frames_ = context->streams[index_]->duration;// * context->streams[index_]->time_base.den;\r
  99 \r
 100                 fps_ = static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num);\r
 101                 if(double_rate(filter))\r
 102                         fps_ *= 2;\r
 103         }\r
 104 \r
 105         void push(const std::shared_ptr<AVPacket>& packet)\r
 106         {\r
 107                 if(!codec_context_)\r
 108                         return;\r
 109 \r
 110                 if(packet && packet->stream_index != index_)\r
 111                         return;\r
 112 \r
 113                 packet_buffer_.push(packet);\r
 114         }\r
 115 \r
 116         std::vector<std::shared_ptr<core::write_frame>> poll()\r
 117         {               \r
 118                 std::vector<std::shared_ptr<core::write_frame>> result;\r
 119 \r
 120                 if(!codec_context_)\r
 121                         result.push_back(make_safe<core::write_frame>(this));\r
 122                 else if(!packet_buffer_.empty())\r
 123                 {\r
 124                         std::shared_ptr<AVFrame> frame;\r
 125 \r
 126                         auto packet = packet_buffer_.front();\r
 127                 \r
 128                         if(packet)\r
 129                         {\r
 130                                 frame = decode(*packet);        \r
 131                                 if(packet->size == 0)\r
 132                                         packet_buffer_.pop();\r
 133                         }\r
 134                         else\r
 135                         {\r
 136                                 if(codec_context_->codec->capabilities | CODEC_CAP_DELAY)\r
 137                                 {\r
 138                                         AVPacket pkt = {0};\r
 139                                         frame = decode(pkt);\r
 140                                 }\r
 141 \r
 142                                 if(!frame)\r
 143                                 {                                       \r
 144                                         packet_buffer_.pop();\r
 145                                         avcodec_flush_buffers(codec_context_.get());\r
 146                                 }\r
 147                         }\r
 148 \r
 149                         std::vector<safe_ptr<AVFrame>> av_frames;\r
 150 \r
 151                         if(filter_)                     \r
 152                                 av_frames = filter_->execute(frame);                    \r
 153                         else if(frame)\r
 154                                 av_frames.push_back(make_safe(frame));\r
 155                                                 \r
 156                         BOOST_FOREACH(auto& frame, av_frames)\r
 157                                 result.push_back(make_write_frame(this, frame, frame_factory_));\r
 158 \r
 159                         if(!packet)\r
 160                                 result.push_back(nullptr);\r
 161                 }\r
 162                 \r
 163                 return result;\r
 164         }\r
 165 \r
 166         std::shared_ptr<AVFrame> decode(AVPacket& pkt)\r
 167         {\r
 168                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 169 \r
 170                 int frame_finished = 0;\r
 171                 const int ret = avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &pkt);\r
 172                 \r
 173                 if(ret < 0)\r
 174                 {\r
 175                         BOOST_THROW_EXCEPTION(\r
 176                                 invalid_operation() <<\r
 177                                 msg_info(av_error_str(ret)) <<\r
 178                                 boost::errinfo_api_function("avcodec_decode_video") <<\r
 179                                 boost::errinfo_errno(AVUNERROR(ret)));\r
 180                 }\r
 181 \r
 182                 pkt.size -= ret;\r
 183                 pkt.data += ret;\r
 184 \r
 185                 if(frame_finished != 0) \r
 186                 {\r
 187                         return decoded_frame;\r
 188                         if(decoded_frame->repeat_pict != 0)\r
 189                                 CASPAR_LOG(warning) << "video_decoder: repeat_pict not implemented.";\r
 190                 }\r
 191 \r
 192                 return nullptr;\r
 193         }\r
 194         \r
 195         bool ready() const\r
 196         {\r
 197                 return !codec_context_ || !packet_buffer_.empty();\r
 198         }\r
 199         \r
 200         core::video_mode::type mode()\r
 201         {\r
 202                 if(!codec_context_)\r
 203                         return frame_factory_->get_video_format_desc().mode;\r
 204 \r
 205                 return mode_;\r
 206         }\r
 207 \r
 208         double fps() const\r
 209         {\r
 210                 return fps_;\r
 211         }\r
 212 };\r
 213 \r
 214 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
 215 void video_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 216 std::vector<std::shared_ptr<core::write_frame>> video_decoder::poll(){return impl_->poll();}\r
 217 bool video_decoder::ready() const{return impl_->ready();}\r
 218 core::video_mode::type video_decoder::mode(){return impl_->mode();}\r
 219 double video_decoder::fps() const{return impl_->fps();}\r
 220 int64_t video_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 221 }