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