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/basic_frame.h>\r
  30 \r
  31 #if defined(_MSC_VER)\r
  32 #pragma warning (push)\r
  33 #pragma warning (disable : 4244)\r
  34 #endif\r
  35 extern "C" \r
  36 {\r
  37         #include <libavcodec/avcodec.h>\r
  38         #include <libavformat/avformat.h>\r
  39 }\r
  40 #if defined(_MSC_VER)\r
  41 #pragma warning (pop)\r
  42 #endif\r
  43 \r
  44 namespace caspar { namespace ffmpeg {\r
  45         \r
  46 struct video_decoder::implementation : public Concurrency::agent, boost::noncopyable\r
  47 {\r
  48         video_decoder::source_t&                                source_;\r
  49         video_decoder::target_t&                                target_;\r
  50 \r
  51         std::shared_ptr<AVCodecContext>                 codec_context_;\r
  52         int                                                                             index_;\r
  53         \r
  54         double                                                                  fps_;\r
  55         int64_t                                                                 nb_frames_;\r
  56 \r
  57         size_t                                                                  width_;\r
  58         size_t                                                                  height_;\r
  59         bool                                                                    is_progressive_;\r
  60 \r
  61         Concurrency::event                                              event_;\r
  62 \r
  63 public:\r
  64         explicit implementation(video_decoder::source_t& source,\r
  65                                                         video_decoder::target_t& target,\r
  66                                                         const safe_ptr<AVFormatContext>& context,\r
  67                                                         double fps) \r
  68                 : source_(source)\r
  69                 , target_(target)\r
  70                 , fps_(fps)\r
  71                 , nb_frames_(0)\r
  72                 , width_(0)\r
  73                 , height_(0)\r
  74                 , is_progressive_(true)\r
  75         {\r
  76                 event_.set();\r
  77 \r
  78                 AVCodec* dec;\r
  79                 index_ = THROW_ON_ERROR3(av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0), "[video_decoder]", ffmpeg_stream_not_found);\r
  80                 CASPAR_VERIFY(index_ > -1, ffmpeg_error());\r
  81                                                 \r
  82                 THROW_ON_ERROR2(avcodec_open(context->streams[index_]->codec, dec), "[video_decoder]");\r
  83                 CASPAR_VERIFY(context->streams[index_]->codec, ffmpeg_error())\r
  84                                                                 \r
  85                 codec_context_.reset(context->streams[index_]->codec, 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                 width_  = codec_context_->width;\r
  97                 height_ = codec_context_->height;\r
  98 \r
  99                 CASPAR_VERIFY(width_ > 0, ffmpeg_error());\r
 100                 CASPAR_VERIFY(height_ > 0, ffmpeg_error());\r
 101 \r
 102                 start();\r
 103         }\r
 104         \r
 105         ~implementation()\r
 106         {\r
 107                 agent::wait(this);\r
 108         }\r
 109         \r
 110         virtual void run()\r
 111         {\r
 112                 try\r
 113                 {\r
 114                         while(true)\r
 115                         {\r
 116                                 auto packet = Concurrency::receive(source_, [this](const std::shared_ptr<AVPacket>& packet)\r
 117                                 {\r
 118                                         return packet && packet->stream_index == index_;\r
 119                                 });\r
 120 \r
 121                                 //if(packet == eof_packet(index_) || packet == loop_packet(index_))\r
 122                                 //{\r
 123                                 //      if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
 124                                 //      {\r
 125                                 //              AVPacket pkt;\r
 126                                 //              av_init_packet(&pkt);\r
 127                                 //              pkt.data = nullptr;\r
 128                                 //              pkt.size = 0;\r
 129                                 //\r
 130                                 //              while(decode(pkt)){}\r
 131                                 //      }\r
 132                                 //}\r
 133                                                                 \r
 134                                 if(packet == eof_packet(index_))                                \r
 135                                         break;\r
 136                                                                 \r
 137                                 if(packet == loop_packet(index_))\r
 138                                 {       \r
 139                                         avcodec_flush_buffers(codec_context_.get());                                    \r
 140                                         Concurrency::send(target_, loop_video());       \r
 141                                 }\r
 142                                 else if(packet->stream_index == index_)\r
 143                                 {                                       \r
 144                                         Concurrency::send(target_, decode(*packet));    \r
 145                                 }\r
 146                         }\r
 147                 }\r
 148                 catch(...)\r
 149                 {\r
 150                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 151                 }\r
 152                 \r
 153                 Concurrency::send(target_, eof_video());\r
 154                                 \r
 155                 done();\r
 156         }\r
 157 \r
 158         std::shared_ptr<AVFrame> decode(AVPacket& pkt)\r
 159         {\r
 160                 event_.wait();\r
 161 \r
 162                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), [this](AVFrame* frame)\r
 163                 {\r
 164                         av_free(frame);\r
 165                         event_.set();\r
 166                 });\r
 167 \r
 168                 int frame_finished = 0;\r
 169                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &pkt), "[video_decocer]");\r
 170                 event_.reset();\r
 171 \r
 172                 // If a decoder consumes less then the whole packet then something is wrong\r
 173                 // that might be just harmless padding at the end, or a problem with the\r
 174                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 175                 pkt.data = nullptr;\r
 176                 pkt.size = 0;\r
 177 \r
 178                 if(frame_finished == 0) \r
 179                         return nullptr;\r
 180 \r
 181                 if(decoded_frame->repeat_pict > 0)\r
 182                         CASPAR_LOG(warning) << "[video_decoder]: Field repeat_pict not implemented.";\r
 183                 \r
 184                 is_progressive_ = decoded_frame->interlaced_frame == 0;\r
 185                                 \r
 186                 return decoded_frame;\r
 187         }\r
 188                 \r
 189         double fps() const\r
 190         {\r
 191                 return fps_;\r
 192         }\r
 193 };\r
 194 \r
 195 video_decoder::video_decoder(source_t& source,\r
 196                                                          target_t& target,\r
 197                                                          const safe_ptr<AVFormatContext>& context, \r
 198                                                          double fps) \r
 199         : impl_(new implementation(source, target, context, fps))\r
 200 {\r
 201 }\r
 202 \r
 203 double video_decoder::fps() const{return impl_->fps();}\r
 204 int64_t video_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 205 size_t video_decoder::width() const{return impl_->width_;}\r
 206 size_t video_decoder::height() const{return impl_->height_;}\r
 207 bool video_decoder::is_progressive() const{return impl_->is_progressive_;}\r
 208 \r
 209 }}