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 "../format/flv.h"\r
  25 #include "../util.h"\r
  26 #include "../filter/filter.h"\r
  27 \r
  28 #include "../../ffmpeg_error.h"\r
  29 #include "../../tbb_avcodec.h"\r
  30 \r
  31 #include <core/producer/frame/image_transform.h>\r
  32 #include <core/producer/frame/frame_factory.h>\r
  33 \r
  34 #include <boost/range/algorithm_ext/push_back.hpp>\r
  35 #include <boost/filesystem.hpp>\r
  36 \r
  37 #include <queue>\r
  38 \r
  39 #if defined(_MSC_VER)\r
  40 #pragma warning (push)\r
  41 #pragma warning (disable : 4244)\r
  42 #endif\r
  43 extern "C" \r
  44 {\r
  45         #include <libavcodec/avcodec.h>\r
  46         #include <libavformat/avformat.h>\r
  47 }\r
  48 #if defined(_MSC_VER)\r
  49 #pragma warning (pop)\r
  50 #endif\r
  51 \r
  52 namespace caspar {\r
  53                 \r
  54 struct video_decoder::implementation : boost::noncopyable\r
  55 {\r
  56         const safe_ptr<core::frame_factory>             frame_factory_;\r
  57         std::shared_ptr<AVCodecContext>                 codec_context_;\r
  58         int                                                                             index_;\r
  59 \r
  60         std::queue<std::shared_ptr<AVPacket>>   packets_;\r
  61 \r
  62         filter                                                                  filter_;\r
  63 \r
  64         double                                                                  fps_;\r
  65         int64_t                                                                 nb_frames_;\r
  66 \r
  67         size_t                                                                  width_;\r
  68         size_t                                                                  height_;\r
  69 \r
  70 public:\r
  71         explicit implementation(const safe_ptr<AVFormatContext>& context, const safe_ptr<core::frame_factory>& frame_factory, const std::wstring& filter) \r
  72                 : frame_factory_(frame_factory)\r
  73                 , filter_(filter)\r
  74                 , fps_(frame_factory_->get_video_format_desc().fps)\r
  75                 , nb_frames_(0)\r
  76                 , width_(0)\r
  77                 , height_(0)\r
  78         {\r
  79                 try\r
  80                 {\r
  81                         AVCodec* dec;\r
  82                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0), "[video_decoder]");\r
  83                                                 \r
  84                         THROW_ON_ERROR2(tbb_avcodec_open(context->streams[index_]->codec, dec), "[video_decoder]");\r
  85                                                                 \r
  86                         codec_context_.reset(context->streams[index_]->codec, tbb_avcodec_close);\r
  87                 \r
  88                         CASPAR_LOG(debug) << "[video_decoder] " << context->streams[index_]->codec->codec->long_name;\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                         if(boost::filesystem2::path(context->filename).extension() == ".flv")\r
  95                         {\r
  96                                 try\r
  97                                 {\r
  98                                         auto meta = read_flv_meta_info(context->filename);\r
  99                                         fps_ = boost::lexical_cast<double>(meta["framerate"]);\r
 100                                         nb_frames_ = static_cast<int64_t>(boost::lexical_cast<double>(meta["duration"])*fps_);\r
 101                                 }\r
 102                                 catch(...){}\r
 103                         }\r
 104                         else\r
 105                         {\r
 106                                 fps_ = static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num);\r
 107                                 nb_frames_ = context->streams[index_]->nb_frames;\r
 108                                 if(nb_frames_ == 0)\r
 109                                         nb_frames_ = context->streams[index_]->duration;// * context->streams[index_]->time_base.den;\r
 110                         }\r
 111 \r
 112                         if(double_rate(filter))\r
 113                                 fps_ *= 2;\r
 114 \r
 115                         width_  = codec_context_->width;\r
 116                         height_ = codec_context_->height;\r
 117                 }\r
 118                 catch(...)\r
 119                 {\r
 120                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_AUDIO, -1, -1, nullptr, 0), "[video_decoder]");\r
 121 \r
 122                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 123                         CASPAR_LOG(warning) << "[video_decoder] Failed to open video-stream. Running without video.";   \r
 124                 }\r
 125         }\r
 126 \r
 127         void push(const std::shared_ptr<AVPacket>& packet)\r
 128         {\r
 129                 if(packet && packet->stream_index != index_)\r
 130                         return;\r
 131 \r
 132                 packets_.push(packet);\r
 133         }\r
 134 \r
 135         std::vector<std::shared_ptr<AVFrame>> poll()\r
 136         {               \r
 137                 std::vector<std::shared_ptr<AVFrame>> result;\r
 138 \r
 139                 if(packets_.empty())\r
 140                         return result;\r
 141 \r
 142                 if(!codec_context_)\r
 143                         return empty_poll();\r
 144 \r
 145                 auto packet = packets_.front();\r
 146                                         \r
 147                 if(packet)\r
 148                 {                       \r
 149                         BOOST_FOREACH(auto& frame, decode(*packet))\r
 150                                 boost::range::push_back(result, filter_.execute(frame));\r
 151 \r
 152                         if(packet->size == 0)\r
 153                                 packets_.pop();\r
 154                 }\r
 155                 else\r
 156                 {\r
 157                         if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
 158                         {\r
 159                                 AVPacket pkt;\r
 160                                 av_init_packet(&pkt);\r
 161                                 pkt.data = nullptr;\r
 162                                 pkt.size = 0;\r
 163 \r
 164                                 BOOST_FOREACH(auto& frame, decode(pkt))\r
 165                                         boost::range::push_back(result, filter_.execute(frame));        \r
 166                         }\r
 167 \r
 168                         if(result.empty())\r
 169                         {                                       \r
 170                                 packets_.pop();\r
 171                                 avcodec_flush_buffers(codec_context_.get());\r
 172                                 result.push_back(nullptr);\r
 173                         }\r
 174                 }\r
 175                 \r
 176                 return result;\r
 177         }\r
 178 \r
 179         std::vector<std::shared_ptr<AVFrame>> empty_poll()\r
 180         {                               \r
 181                 auto packet = packets_.front();\r
 182                 packets_.pop();\r
 183 \r
 184                 if(!packet)                     \r
 185                         return boost::assign::list_of(nullptr);\r
 186 \r
 187                 std::shared_ptr<AVFrame> frame(avcodec_alloc_frame(), av_free);\r
 188                 frame->data[0] = nullptr;\r
 189 \r
 190                 return boost::assign::list_of(frame);                                   \r
 191         }\r
 192 \r
 193         std::vector<std::shared_ptr<AVFrame>> decode(AVPacket& pkt)\r
 194         {\r
 195                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 196 \r
 197                 int frame_finished = 0;\r
 198                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &pkt), "[video_decocer]");\r
 199                 \r
 200                 // If a decoder consumes less then the whole packet then something is wrong\r
 201                 // that might be just harmless padding at the end, or a problem with the\r
 202                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 203                 pkt.data = nullptr;\r
 204                 pkt.size = 0;\r
 205 \r
 206                 if(frame_finished == 0) \r
 207                         return std::vector<std::shared_ptr<AVFrame>>();\r
 208 \r
 209                 if(decoded_frame->repeat_pict % 2 > 0)\r
 210                         CASPAR_LOG(warning) << "[video_decoder]: Field repeat_pict not implemented.";\r
 211                 \r
 212                 return std::vector<std::shared_ptr<AVFrame>>(1 + decoded_frame->repeat_pict/2, decoded_frame);\r
 213         }\r
 214         \r
 215         bool ready() const\r
 216         {\r
 217                 return !packets_.empty();\r
 218         }\r
 219         \r
 220         double fps() const\r
 221         {\r
 222                 return fps_;\r
 223         }\r
 224 };\r
 225 \r
 226 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
 227 void video_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 228 std::vector<std::shared_ptr<AVFrame>> video_decoder::poll(){return impl_->poll();}\r
 229 bool video_decoder::ready() const{return impl_->ready();}\r
 230 double video_decoder::fps() const{return impl_->fps();}\r
 231 int64_t video_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 232 size_t video_decoder::width() const{return impl_->width_;}\r
 233 size_t video_decoder::height() const{return impl_->height_;}\r
 234 }