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 #include <connect.h>\r
  45 #include <semaphore.h>\r
  46 \r
  47 namespace caspar { namespace ffmpeg {\r
  48         \r
  49 struct video_decoder::implementation : boost::noncopyable\r
  50 {       \r
  51         int                                                                             index_;\r
  52         std::shared_ptr<AVCodecContext>                 codec_context_;\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::transformer<std::shared_ptr<AVPacket>, std::shared_ptr<AVFrame>> transformer_;\r
  62         \r
  63         Concurrency::semaphore semaphore_;\r
  64 \r
  65 public:\r
  66         explicit implementation(video_decoder::source_t& source, video_decoder::target_t& target, AVFormatContext& context) \r
  67                 : codec_context_(open_codec(context, AVMEDIA_TYPE_VIDEO, index_))\r
  68                 , fps_(static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num))\r
  69                 , nb_frames_(context.streams[index_]->nb_frames)\r
  70                 , width_(codec_context_->width)\r
  71                 , height_(codec_context_->height)\r
  72                 , is_progressive_(true)\r
  73                 , transformer_(std::bind(&implementation::decode, this, std::placeholders::_1), &target, [this](const std::shared_ptr<AVPacket>& packet)\r
  74                         {\r
  75                                 return packet && packet->stream_index == index_;\r
  76                         })\r
  77                 , semaphore_(1)\r
  78         {               \r
  79                 CASPAR_LOG(debug) << "[video_decoder] " << context.streams[index_]->codec->codec->long_name;\r
  80                 \r
  81                 CASPAR_VERIFY(width_ > 0, ffmpeg_error());\r
  82                 CASPAR_VERIFY(height_ > 0, ffmpeg_error());\r
  83 \r
  84                 Concurrency::connect(source, transformer_);\r
  85         }\r
  86                 \r
  87         std::shared_ptr<AVFrame> decode(const std::shared_ptr<AVPacket>& packet)\r
  88         {\r
  89                 if(!packet)\r
  90                         return nullptr;\r
  91 \r
  92                 if(packet == loop_packet(index_))\r
  93                         return loop_video();\r
  94 \r
  95                 if(packet == eof_packet(index_))\r
  96                         return eof_video();\r
  97                 \r
  98                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), [this](AVFrame* frame)\r
  99                 {\r
 100                         av_free(frame);\r
 101                         semaphore_.release();\r
 102                 });\r
 103                 semaphore_.acquire();\r
 104 \r
 105                 int frame_finished = 0;\r
 106                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, packet.get()), "[video_decocer]");\r
 107 \r
 108                 // 1 packet <=> 1 frame.\r
 109                 // If a decoder consumes less then the whole packet then something is wrong\r
 110                 // that might be just harmless padding at the end, or a problem with the\r
 111                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 112 \r
 113                 if(frame_finished == 0) \r
 114                         return nullptr;\r
 115 \r
 116                 if(decoded_frame->repeat_pict > 0)\r
 117                         CASPAR_LOG(warning) << "[video_decoder]: Field repeat_pict not implemented.";\r
 118                 \r
 119                 is_progressive_ = decoded_frame->interlaced_frame == 0;\r
 120                                 \r
 121                 return decoded_frame;\r
 122         }\r
 123                 \r
 124         double fps() const\r
 125         {\r
 126                 return fps_;\r
 127         }\r
 128 };\r
 129 \r
 130 video_decoder::video_decoder(video_decoder::source_t& source, video_decoder::target_t& target, AVFormatContext& context) \r
 131         : impl_(new implementation(source, target, context))\r
 132 {\r
 133 }\r
 134 \r
 135 double video_decoder::fps() const{return impl_->fps();}\r
 136 int64_t video_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 137 size_t video_decoder::width() const{return impl_->width_;}\r
 138 size_t video_decoder::height() const{return impl_->height_;}\r
 139 bool video_decoder::is_progressive() const{return impl_->is_progressive_;}\r
 140 \r
 141 }}