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