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 \r
  29 #include <core/producer/frame/frame_transform.h>\r
  30 #include <core/producer/frame/frame_factory.h>\r
  31 \r
  32 #include <boost/range/algorithm_ext/push_back.hpp>\r
  33 #include <boost/filesystem.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 { namespace ffmpeg {\r
  51         \r
  52 struct video_decoder::implementation : boost::noncopyable\r
  53 {\r
  54         const safe_ptr<core::frame_factory>             frame_factory_;\r
  55         int                                                                             index_;\r
  56         safe_ptr<AVCodecContext>                                codec_context_;\r
  57 \r
  58         std::queue<std::shared_ptr<AVPacket>>   packets_;\r
  59         \r
  60         const double                                                    fps_;\r
  61         const int64_t                                                   nb_frames_;\r
  62         const size_t                                                    width_;\r
  63         const size_t                                                    height_;\r
  64 \r
  65 public:\r
  66         explicit implementation(const safe_ptr<AVFormatContext>& context, const safe_ptr<core::frame_factory>& frame_factory) \r
  67                 : frame_factory_(frame_factory)\r
  68                 , codec_context_(open_codec(*context, AVMEDIA_TYPE_VIDEO, index_))\r
  69                 , fps_(static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num))\r
  70                 , nb_frames_(context->streams[index_]->nb_frames)\r
  71                 , width_(codec_context_->width)\r
  72                 , height_(codec_context_->height)\r
  73         {                       \r
  74         }\r
  75 \r
  76         void push(const std::shared_ptr<AVPacket>& packet)\r
  77         {\r
  78                 if(packet && packet->stream_index != index_)\r
  79                         return;\r
  80 \r
  81                 packets_.push(packet);\r
  82         }\r
  83 \r
  84         std::vector<std::shared_ptr<AVFrame>> poll()\r
  85         {               \r
  86                 std::vector<std::shared_ptr<AVFrame>> result;\r
  87 \r
  88                 if(packets_.empty())\r
  89                         return result;\r
  90                 \r
  91                 auto packet = packets_.front();\r
  92                                         \r
  93                 if(packet)\r
  94                 {                       \r
  95                         boost::range::push_back(result, decode(*packet));\r
  96 \r
  97                         if(packet->size == 0)\r
  98                                 packets_.pop();\r
  99                 }\r
 100                 else\r
 101                 {\r
 102                         if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
 103                         {\r
 104                                 AVPacket pkt;\r
 105                                 av_init_packet(&pkt);\r
 106                                 pkt.data = nullptr;\r
 107                                 pkt.size = 0;\r
 108 \r
 109                                 boost::range::push_back(result, decode(pkt));   \r
 110                         }\r
 111 \r
 112                         if(result.empty())\r
 113                         {                                       \r
 114                                 packets_.pop();\r
 115                                 avcodec_flush_buffers(codec_context_.get());\r
 116                                 result.push_back(nullptr);\r
 117                         }\r
 118                 }\r
 119                 \r
 120                 return result;\r
 121         }\r
 122         \r
 123         std::vector<std::shared_ptr<AVFrame>> decode(AVPacket& pkt)\r
 124         {\r
 125                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 126 \r
 127                 int frame_finished = 0;\r
 128                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &pkt), "[video_decocer]");\r
 129                 \r
 130                 // If a decoder consumes less then the whole packet then something is wrong\r
 131                 // that might be just harmless padding at the end, or a problem with the\r
 132                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 133                 pkt.data = nullptr;\r
 134                 pkt.size = 0;\r
 135 \r
 136                 if(frame_finished == 0) \r
 137                         return std::vector<std::shared_ptr<AVFrame>>();\r
 138 \r
 139                 if(decoded_frame->repeat_pict % 2 > 0)\r
 140                         CASPAR_LOG(warning) << "[video_decoder]: Field repeat_pict not implemented.";\r
 141                 \r
 142                 return std::vector<std::shared_ptr<AVFrame>>(1 + decoded_frame->repeat_pict/2, decoded_frame);\r
 143         }\r
 144         \r
 145         bool ready() const\r
 146         {\r
 147                 return !packets_.empty();\r
 148         }\r
 149         \r
 150         double fps() const\r
 151         {\r
 152                 return fps_;\r
 153         }\r
 154 };\r
 155 \r
 156 video_decoder::video_decoder(const safe_ptr<AVFormatContext>& context, const safe_ptr<core::frame_factory>& frame_factory) : impl_(new implementation(context, frame_factory)){}\r
 157 void video_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 158 std::vector<std::shared_ptr<AVFrame>> video_decoder::poll(){return impl_->poll();}\r
 159 bool video_decoder::ready() const{return impl_->ready();}\r
 160 double video_decoder::fps() const{return impl_->fps();}\r
 161 int64_t video_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 162 size_t video_decoder::width() const{return impl_->width_;}\r
 163 size_t video_decoder::height() const{return impl_->height_;}\r
 164 \r
 165 }}