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 \r
  65         size_t                                                                  width_;\r
  66         size_t                                                                  height_;\r
  67 \r
  68 public:\r
  69         explicit implementation(const safe_ptr<AVFormatContext>& context, const safe_ptr<core::frame_factory>& frame_factory, const std::wstring& filter) \r
  70                 : frame_factory_(frame_factory)\r
  71                 , filter_(filter)\r
  72                 , fps_(frame_factory_->get_video_format_desc().fps)\r
  73                 , nb_frames_(0)\r
  74                 , width_(0)\r
  75                 , height_(0)\r
  76         {\r
  77                 try\r
  78                 {\r
  79                         AVCodec* dec;\r
  80                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0), "[video_decoder]");\r
  81                                                 \r
  82                         THROW_ON_ERROR2(tbb_avcodec_open(context->streams[index_]->codec, dec), "[video_decoder]");\r
  83                                                                 \r
  84                         codec_context_.reset(context->streams[index_]->codec, tbb_avcodec_close);\r
  85                 \r
  86                         CASPAR_LOG(debug) << "[video_decoder] " << context->streams[index_]->codec->codec->long_name;\r
  87 \r
  88                         // Some files give an invalid time_base numerator, try to fix it.\r
  89                         if(codec_context_ && codec_context_->time_base.num == 1)\r
  90                                 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
  91                 \r
  92                         nb_frames_ = context->streams[index_]->nb_frames;\r
  93                         if(nb_frames_ == 0)\r
  94                                 nb_frames_ = context->streams[index_]->duration;// * context->streams[index_]->time_base.den;\r
  95 \r
  96                         fps_ = static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num);\r
  97                         if(double_rate(filter))\r
  98                                 fps_ *= 2;\r
  99 \r
 100                         width_  = codec_context_->width;\r
 101                         height_ = codec_context_->height;\r
 102                 }\r
 103                 catch(...)\r
 104                 {\r
 105                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_AUDIO, -1, -1, nullptr, 0), "[video_decoder]");\r
 106 \r
 107                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 108                         CASPAR_LOG(warning) << "[video_decoder] Failed to open video-stream. Running without video.";   \r
 109                 }\r
 110         }\r
 111 \r
 112         void push(const std::shared_ptr<AVPacket>& packet)\r
 113         {\r
 114                 if(packet && packet->stream_index != index_)\r
 115                         return;\r
 116 \r
 117                 packets_.push(packet);\r
 118         }\r
 119 \r
 120         std::vector<std::shared_ptr<AVFrame>> poll()\r
 121         {               \r
 122                 std::vector<std::shared_ptr<AVFrame>> result;\r
 123 \r
 124                 if(packets_.empty())\r
 125                         return result;\r
 126 \r
 127                 if(!codec_context_)\r
 128                         return empty_poll();\r
 129 \r
 130                 auto packet = packets_.front();\r
 131                                         \r
 132                 if(packet)\r
 133                 {                       \r
 134                         BOOST_FOREACH(auto& frame, decode(*packet))\r
 135                                 boost::range::push_back(result, filter_.execute(frame));\r
 136 \r
 137                         if(packet->size == 0)\r
 138                                 packets_.pop();\r
 139                 }\r
 140                 else\r
 141                 {\r
 142                         if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
 143                         {\r
 144                                 AVPacket pkt;\r
 145                                 av_init_packet(&pkt);\r
 146                                 pkt.data = nullptr;\r
 147                                 pkt.size = 0;\r
 148 \r
 149                                 BOOST_FOREACH(auto& frame, decode(pkt))\r
 150                                         boost::range::push_back(result, filter_.execute(frame));        \r
 151                         }\r
 152 \r
 153                         if(result.empty())\r
 154                         {                                       \r
 155                                 packets_.pop();\r
 156                                 avcodec_flush_buffers(codec_context_.get());\r
 157                                 result.push_back(nullptr);\r
 158                         }\r
 159                 }\r
 160                 \r
 161                 return result;\r
 162         }\r
 163 \r
 164         std::vector<std::shared_ptr<AVFrame>> empty_poll()\r
 165         {                               \r
 166                 auto packet = packets_.front();\r
 167                 packets_.pop();\r
 168 \r
 169                 if(!packet)                     \r
 170                         return boost::assign::list_of(nullptr);\r
 171 \r
 172                 std::shared_ptr<AVFrame> frame(avcodec_alloc_frame(), av_free);\r
 173                 frame->data[0] = nullptr;\r
 174 \r
 175                 return boost::assign::list_of(frame);                                   \r
 176         }\r
 177 \r
 178         std::vector<std::shared_ptr<AVFrame>> decode(AVPacket& pkt)\r
 179         {\r
 180                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 181 \r
 182                 int frame_finished = 0;\r
 183                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &pkt), "[video_decocer]");\r
 184                 \r
 185                 // If a decoder consumes less then the whole packet then something is wrong\r
 186                 // that might be just harmless padding at the end, or a problem with the\r
 187                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 188                 pkt.data = nullptr;\r
 189                 pkt.size = 0;\r
 190 \r
 191                 if(frame_finished == 0) \r
 192                         return std::vector<std::shared_ptr<AVFrame>>();\r
 193 \r
 194                 if(decoded_frame->repeat_pict % 2 > 0)\r
 195                         CASPAR_LOG(warning) << "[video_decoder]: Field repeat_pict not implemented.";\r
 196                 \r
 197                 return std::vector<std::shared_ptr<AVFrame>>(1 + decoded_frame->repeat_pict/2, decoded_frame);\r
 198         }\r
 199         \r
 200         bool ready() const\r
 201         {\r
 202                 return !packets_.empty();\r
 203         }\r
 204         \r
 205         double fps() const\r
 206         {\r
 207                 return fps_;\r
 208         }\r
 209 };\r
 210 \r
 211 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
 212 void video_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 213 std::vector<std::shared_ptr<AVFrame>> video_decoder::poll(){return impl_->poll();}\r
 214 bool video_decoder::ready() const{return impl_->ready();}\r
 215 double video_decoder::fps() const{return impl_->fps();}\r
 216 int64_t video_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 217 size_t video_decoder::width() const{return impl_->width_;}\r
 218 size_t video_decoder::height() const{return impl_->height_;}\r
 219 }