git.sesse.net Git - casparcg/blob - modules/ffmpeg/producer/video/video_decoder.cpp

   1 /*\r
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 * This file is part of CasparCG (www.casparcg.com).\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 * Author: Robert Nagy, ronag89@gmail.com\r
  20 */\r
  21 \r
  22 #include "../../stdafx.h"\r
  23 \r
  24 #include "video_decoder.h"\r
  25 \r
  26 #include "../util/util.h"\r
  27 \r
  28 #include "../../ffmpeg_error.h"\r
  29 \r
  30 #include <core/producer/frame/frame_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 #include <boost/filesystem.hpp>\r
  35 \r
  36 #include <queue>\r
  37 \r
  38 #if defined(_MSC_VER)\r
  39 #pragma warning (push)\r
  40 #pragma warning (disable : 4244)\r
  41 #endif\r
  42 extern "C" \r
  43 {\r
  44         #include <libavcodec/avcodec.h>\r
  45         #include <libavformat/avformat.h>\r
  46 }\r
  47 #if defined(_MSC_VER)\r
  48 #pragma warning (pop)\r
  49 #endif\r
  50 \r
  51 namespace caspar { namespace ffmpeg {\r
  52         \r
  53 struct video_decoder::implementation : boost::noncopyable\r
  54 {\r
  55         int                                                                             index_;\r
  56         const safe_ptr<AVCodecContext>                  codec_context_;\r
  57 \r
  58         std::queue<safe_ptr<AVPacket>>                  packets_;\r
  59         \r
  60         const uint32_t                                                  nb_frames_;\r
  61 \r
  62         const size_t                                                    width_;\r
  63         const size_t                                                    height_;\r
  64         bool                                                                    is_progressive_;\r
  65 \r
  66         tbb::atomic<size_t>                                             file_frame_number_;\r
  67 \r
  68 public:\r
  69         explicit implementation(const safe_ptr<AVFormatContext>& context) \r
  70                 : codec_context_(open_codec(*context, AVMEDIA_TYPE_VIDEO, index_))\r
  71                 , nb_frames_(static_cast<uint32_t>(context->streams[index_]->nb_frames))\r
  72                 , width_(codec_context_->width)\r
  73                 , height_(codec_context_->height)\r
  74         {\r
  75                 file_frame_number_ = 0;\r
  76         }\r
  77 \r
  78         void push(const std::shared_ptr<AVPacket>& packet)\r
  79         {\r
  80                 if(!packet)\r
  81                         return;\r
  82 \r
  83                 if(packet->stream_index == index_ || packet->data == nullptr)\r
  84                         packets_.push(make_safe_ptr(packet));\r
  85         }\r
  86 \r
  87         std::shared_ptr<AVFrame> poll()\r
  88         {               \r
  89                 if(packets_.empty())\r
  90                         return nullptr;\r
  91                 \r
  92                 auto packet = packets_.front();\r
  93                                         \r
  94                 if(packet->data == nullptr)\r
  95                 {                       \r
  96                         if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
  97                         {\r
  98                                 auto video = decode(packet);\r
  99                                 if(video)\r
 100                                         return video;\r
 101                         }\r
 102                                         \r
 103                         packets_.pop();\r
 104                         file_frame_number_ = static_cast<size_t>(packet->pos);\r
 105                         avcodec_flush_buffers(codec_context_.get());\r
 106                         return flush_video();   \r
 107                 }\r
 108                         \r
 109                 packets_.pop();\r
 110                 return decode(packet);\r
 111         }\r
 112 \r
 113         std::shared_ptr<AVFrame> decode(safe_ptr<AVPacket> pkt)\r
 114         {\r
 115                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 116 \r
 117                 int frame_finished = 0;\r
 118                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, pkt.get()), "[video_decoder]");\r
 119                 \r
 120                 // If a decoder consumes less then the whole packet then something is wrong\r
 121                 // that might be just harmless padding at the end, or a problem with the\r
 122                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 123 \r
 124                 if(frame_finished == 0) \r
 125                         return nullptr;\r
 126 \r
 127                 is_progressive_ = !decoded_frame->interlaced_frame;\r
 128 \r
 129                 if(decoded_frame->repeat_pict > 0)\r
 130                         CASPAR_LOG(warning) << "[video_decoder] Field repeat_pict not implemented.";\r
 131                 \r
 132                 ++file_frame_number_;\r
 133 \r
 134                 // This ties the life of the decoded_frame to the packet that it came from. For the\r
 135                 // current version of ffmpeg (0.8 or c17808c) the RAW_VIDEO codec returns frame data\r
 136                 // owned by the packet.\r
 137                 return std::shared_ptr<AVFrame>(decoded_frame.get(), [decoded_frame, pkt](AVFrame*){});\r
 138         }\r
 139         \r
 140         bool ready() const\r
 141         {\r
 142                 return packets_.size() >= 8;\r
 143         }\r
 144 \r
 145         uint32_t nb_frames() const\r
 146         {\r
 147                 return std::max<uint32_t>(nb_frames_, file_frame_number_);\r
 148         }\r
 149 \r
 150         std::wstring print() const\r
 151         {               \r
 152                 return L"[video-decoder] " + widen(codec_context_->codec->long_name);\r
 153         }\r
 154 };\r
 155 \r
 156 video_decoder::video_decoder(const safe_ptr<AVFormatContext>& context) : impl_(new implementation(context)){}\r
 157 void video_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 158 std::shared_ptr<AVFrame> video_decoder::poll(){return impl_->poll();}\r
 159 bool video_decoder::ready() const{return impl_->ready();}\r
 160 size_t video_decoder::width() const{return impl_->width_;}\r
 161 size_t video_decoder::height() const{return impl_->height_;}\r
 162 uint32_t video_decoder::nb_frames() const{return impl_->nb_frames();}\r
 163 uint32_t video_decoder::file_frame_number() const{return impl_->file_frame_number_;}\r
 164 bool    video_decoder::is_progressive() const{return impl_->is_progressive_;}\r
 165 std::wstring video_decoder::print() const{return impl_->print();}\r
 166 \r
 167 }}