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/image_transform.h>\r
  31 #include <core/producer/frame/frame_factory.h>\r
  32 \r
  33 #include <boost/range/algorithm_ext/push_back.hpp>\r
  34 \r
  35 #include <queue>\r
  36 \r
  37 #if defined(_MSC_VER)\r
  38 #pragma warning (push)\r
  39 #pragma warning (disable : 4244)\r
  40 #endif\r
  41 extern "C" \r
  42 {\r
  43         #include <libavcodec/avcodec.h>\r
  44         #include <libavformat/avformat.h>\r
  45 }\r
  46 #if defined(_MSC_VER)\r
  47 #pragma warning (pop)\r
  48 #endif\r
  49 \r
  50 namespace caspar {\r
  51                 \r
  52 struct video_decoder::implementation : boost::noncopyable\r
  53 {\r
  54         const safe_ptr<core::frame_factory>             frame_factory_;\r
  55         std::shared_ptr<AVCodecContext>                 codec_context_;\r
  56         int                                                                             index_;\r
  57 \r
  58         std::queue<std::shared_ptr<AVPacket>>   packets_;\r
  59 \r
  60         filter                                                                  filter_;\r
  61 \r
  62         double                                                                  fps_;\r
  63         int64_t                                                                 nb_frames_;\r
  64 public:\r
  65         explicit implementation(const safe_ptr<AVFormatContext>& context, const safe_ptr<core::frame_factory>& frame_factory, const std::wstring& filter) \r
  66                 : frame_factory_(frame_factory)\r
  67                 , filter_(filter)\r
  68                 , fps_(frame_factory_->get_video_format_desc().fps)\r
  69                 , nb_frames_(0)\r
  70         {\r
  71                 try\r
  72                 {\r
  73                         AVCodec* dec;\r
  74                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0), "[video_decoder]");\r
  75                                                 \r
  76                         THROW_ON_ERROR2(tbb_avcodec_open(context->streams[index_]->codec, dec), "[video_decoder]");\r
  77                                                                 \r
  78                         codec_context_.reset(context->streams[index_]->codec, tbb_avcodec_close);\r
  79                 \r
  80                         CASPAR_LOG(debug) << "[video_decoder] " << context->streams[index_]->codec->codec->long_name;\r
  81 \r
  82                         // Some files give an invalid time_base numerator, try to fix it.\r
  83                         if(codec_context_ && codec_context_->time_base.num == 1)\r
  84                                 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
  85                 \r
  86                         nb_frames_ = context->streams[index_]->nb_frames;\r
  87                         if(nb_frames_ == 0)\r
  88                                 nb_frames_ = context->streams[index_]->duration;// * context->streams[index_]->time_base.den;\r
  89 \r
  90                         fps_ = static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num);\r
  91                         if(double_rate(filter))\r
  92                                 fps_ *= 2;\r
  93                 }\r
  94                 catch(...)\r
  95                 {\r
  96                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_AUDIO, -1, -1, nullptr, 0), "[video_decoder]");\r
  97 \r
  98                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  99                         CASPAR_LOG(warning) << "[video_decoder] Failed to open video-stream. Running without video.";   \r
 100                 }\r
 101         }\r
 102 \r
 103         void push(const std::shared_ptr<AVPacket>& packet)\r
 104         {\r
 105                 if(packet && packet->stream_index != index_)\r
 106                         return;\r
 107 \r
 108                 packets_.push(packet);\r
 109         }\r
 110 \r
 111         std::vector<std::shared_ptr<AVFrame>> poll()\r
 112         {               \r
 113                 std::vector<std::shared_ptr<AVFrame>> result;\r
 114 \r
 115                 if(packets_.empty())\r
 116                         return result;\r
 117 \r
 118                 if(!codec_context_)\r
 119                         return empty_poll();\r
 120 \r
 121                 auto packet = packets_.front();\r
 122                                         \r
 123                 if(packet)\r
 124                 {                       \r
 125                         BOOST_FOREACH(auto& frame, decode(*packet))\r
 126                                 boost::range::push_back(result, filter_.execute(frame));\r
 127 \r
 128                         if(packet->size == 0)\r
 129                                 packets_.pop();\r
 130                 }\r
 131                 else\r
 132                 {\r
 133                         if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
 134                         {\r
 135                                 AVPacket pkt;\r
 136                                 av_init_packet(&pkt);\r
 137                                 pkt.data = nullptr;\r
 138                                 pkt.size = 0;\r
 139 \r
 140                                 BOOST_FOREACH(auto& frame, decode(pkt))\r
 141                                         boost::range::push_back(result, filter_.execute(frame));        \r
 142                         }\r
 143 \r
 144                         if(result.empty())\r
 145                         {                                       \r
 146                                 packets_.pop();\r
 147                                 avcodec_flush_buffers(codec_context_.get());\r
 148                                 result.push_back(nullptr);\r
 149                         }\r
 150                 }\r
 151                 \r
 152                 return result;\r
 153         }\r
 154 \r
 155         std::vector<std::shared_ptr<AVFrame>> empty_poll()\r
 156         {                               \r
 157                 auto packet = packets_.front();\r
 158                 packets_.pop();\r
 159 \r
 160                 if(!packet)                     \r
 161                         return boost::assign::list_of(nullptr);\r
 162 \r
 163                 std::shared_ptr<AVFrame> frame(avcodec_alloc_frame(), av_free);\r
 164                 frame->data[0] = nullptr;\r
 165 \r
 166                 return boost::assign::list_of(frame);                                   \r
 167         }\r
 168 \r
 169         std::vector<std::shared_ptr<AVFrame>> decode(AVPacket& pkt)\r
 170         {\r
 171                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 172 \r
 173                 int frame_finished = 0;\r
 174                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &pkt), "[video_decocer]");\r
 175                 \r
 176                 // If a decoder consumes less then the whole packet then something is wrong\r
 177                 // that might be just harmless padding at the end, or a problem with the\r
 178                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 179                 pkt.data = nullptr;\r
 180                 pkt.size = 0;\r
 181 \r
 182                 if(frame_finished == 0) \r
 183                         return std::vector<std::shared_ptr<AVFrame>>();\r
 184 \r
 185                 if(decoded_frame->repeat_pict % 2 > 0)\r
 186                                 CASPAR_LOG(warning) << "[video_decoder]: Field repeat_pict not implemented.";\r
 187                 \r
 188                 return std::vector<std::shared_ptr<AVFrame>>(1 + decoded_frame->repeat_pict/2, decoded_frame);\r
 189         }\r
 190         \r
 191         bool ready() const\r
 192         {\r
 193                 return !packets_.empty();\r
 194         }\r
 195         \r
 196         double fps() const\r
 197         {\r
 198                 return fps_;\r
 199         }\r
 200 };\r
 201 \r
 202 video_decoder::video_decoder(const safe_ptr<AVFormatContext>& context, const safe_ptr<core::frame_factory>& frame_factory, const std::wstring& filter) : impl_(new implementation(context, frame_factory, filter)){}\r
 203 void video_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 204 std::vector<std::shared_ptr<AVFrame>> video_decoder::poll(){return impl_->poll();}\r
 205 bool video_decoder::ready() const{return impl_->ready();}\r
 206 double video_decoder::fps() const{return impl_->fps();}\r
 207 int64_t video_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 208 }