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                         // Some files give an invalid time_base numerator, try to fix it.\r
  81                         if(codec_context_ && codec_context_->time_base.num == 1)\r
  82                                 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
  83                 \r
  84                         nb_frames_ = context->streams[index_]->nb_frames;\r
  85                         if(nb_frames_ == 0)\r
  86                                 nb_frames_ = context->streams[index_]->duration;// * context->streams[index_]->time_base.den;\r
  87 \r
  88                         fps_ = static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num);\r
  89                         if(double_rate(filter))\r
  90                                 fps_ *= 2;\r
  91                 }\r
  92                 catch(...)\r
  93                 {\r
  94                         index_ = THROW_ON_ERROR2(av_find_best_stream(context.get(), AVMEDIA_TYPE_AUDIO, -1, -1, nullptr, 0), "[video_decoder]");\r
  95 \r
  96                         CASPAR_LOG_CURRENT_EXCEPTION();\r
  97                         CASPAR_LOG(warning) << "[video_decoder] Failed to open video-stream. Running without video.";   \r
  98                 }\r
  99         }\r
 100 \r
 101         void push(const std::shared_ptr<AVPacket>& packet)\r
 102         {\r
 103                 if(packet && packet->stream_index != index_)\r
 104                         return;\r
 105 \r
 106                 packets_.push(packet);\r
 107         }\r
 108 \r
 109         std::vector<std::shared_ptr<AVFrame>> poll()\r
 110         {               \r
 111                 if(!codec_context_)\r
 112                         return empty_poll();\r
 113 \r
 114                 std::vector<std::shared_ptr<AVFrame>> result;\r
 115 \r
 116                 while(!packets_.empty() && result.empty())\r
 117                 {\r
 118                         auto packet = packets_.front();\r
 119                                         \r
 120                         if(packet)\r
 121                         {\r
 122                                 auto frame = decode(*packet);\r
 123                                 boost::range::push_back(result, filter_.execute(frame));\r
 124                                 if(packet->size == 0)\r
 125                                         packets_.pop();\r
 126                         }\r
 127                         else\r
 128                         {\r
 129                                 if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
 130                                 {\r
 131                                         AVPacket pkt;\r
 132                                         av_init_packet(&pkt);\r
 133                                         pkt.data = nullptr;\r
 134                                         pkt.size = 0;\r
 135                                         auto frame = decode(pkt);\r
 136                                         boost::range::push_back(result, filter_.execute(frame));        \r
 137                                 }\r
 138 \r
 139                                 if(result.empty())\r
 140                                 {                                       \r
 141                                         packets_.pop();\r
 142                                         avcodec_flush_buffers(codec_context_.get());\r
 143                                         result.push_back(nullptr);\r
 144                                 }\r
 145                         }\r
 146                 }\r
 147                 \r
 148                 return result;\r
 149         }\r
 150 \r
 151         std::vector<std::shared_ptr<AVFrame>> empty_poll()\r
 152         {               \r
 153                 if(packets_.empty())\r
 154                         return std::vector<std::shared_ptr<AVFrame>>();\r
 155                 \r
 156                 auto packet = packets_.front();\r
 157                 packets_.pop();\r
 158 \r
 159                 if(!packet)                     \r
 160                         return boost::assign::list_of(nullptr);\r
 161 \r
 162                 std::shared_ptr<AVFrame> frame(avcodec_alloc_frame(), av_free);\r
 163                 frame->data[0] = nullptr;\r
 164 \r
 165                 return boost::assign::list_of(frame);                                   \r
 166         }\r
 167 \r
 168         std::shared_ptr<AVFrame> decode(AVPacket& pkt)\r
 169         {\r
 170                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 171 \r
 172                 int frame_finished = 0;\r
 173                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &pkt), "[video_decocer]");\r
 174                 \r
 175                 // If a decoder consumes less then the whole packet then something is wrong\r
 176                 // that might be just harmless padding at the end, or a problem with the\r
 177                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 178                 pkt.data = nullptr;\r
 179                 pkt.size = 0;\r
 180 \r
 181                 if(frame_finished != 0) \r
 182                 {\r
 183                         if(decoded_frame->repeat_pict != 0)\r
 184                                 CASPAR_LOG(warning) << "video_decoder: repeat_pict not implemented.";\r
 185                         return decoded_frame;\r
 186                 }\r
 187 \r
 188                 return nullptr;\r
 189         }\r
 190         \r
 191         bool ready() const\r
 192         {\r
 193                 return !codec_context_ || packets_.size() > 2;\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 }