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 int64_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_(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                 CASPAR_LOG(debug) << "[video_decoder] " << context->streams[index_]->codec->codec->long_name;\r
  77         }\r
  78 \r
  79         void push(const std::shared_ptr<AVPacket>& packet)\r
  80         {\r
  81                 if(!packet)\r
  82                         return;\r
  83 \r
  84                 if(packet->stream_index == index_ || packet->data == nullptr)\r
  85                         packets_.push(make_safe_ptr(packet));\r
  86         }\r
  87 \r
  88         std::shared_ptr<AVFrame> poll()\r
  89         {               \r
  90                 if(packets_.empty())\r
  91                         return nullptr;\r
  92                 \r
  93                 auto packet = packets_.front();\r
  94                                         \r
  95                 if(packet->data == nullptr)\r
  96                 {                       \r
  97                         if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
  98                         {\r
  99                                 auto video = decode(*packet);\r
 100                                 if(video)\r
 101                                         return video;\r
 102                         }\r
 103                                         \r
 104                         packets_.pop();\r
 105                         file_frame_number_ = static_cast<size_t>(packet->pos);\r
 106                         avcodec_flush_buffers(codec_context_.get());\r
 107                         return flush_video();   \r
 108                 }\r
 109                         \r
 110                 packets_.pop();\r
 111                 return decode(*packet);\r
 112         }\r
 113 \r
 114         std::shared_ptr<AVFrame> decode(AVPacket& pkt)\r
 115         {\r
 116                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 117 \r
 118                 int frame_finished = 0;\r
 119                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &pkt), "[video_decocer]");\r
 120                 \r
 121                 // If a decoder consumes less then the whole packet then something is wrong\r
 122                 // that might be just harmless padding at the end, or a problem with the\r
 123                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 124 \r
 125                 if(frame_finished == 0) \r
 126                         return nullptr;\r
 127 \r
 128                 is_progressive_ = !decoded_frame->interlaced_frame;\r
 129 \r
 130                 if(decoded_frame->repeat_pict > 0)\r
 131                         CASPAR_LOG(warning) << "[video_decoder] Field repeat_pict not implemented.";\r
 132                 \r
 133                 ++file_frame_number_;\r
 134 \r
 135                 return decoded_frame;\r
 136         }\r
 137         \r
 138         bool ready() const\r
 139         {\r
 140                 return packets_.size() > 10;\r
 141         }\r
 142 \r
 143         int64_t nb_frames() const\r
 144         {\r
 145                 return std::max<int64_t>(nb_frames_, file_frame_number_);\r
 146         }\r
 147 };\r
 148 \r
 149 video_decoder::video_decoder(const safe_ptr<AVFormatContext>& context) : impl_(new implementation(context)){}\r
 150 void video_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 151 std::shared_ptr<AVFrame> video_decoder::poll(){return impl_->poll();}\r
 152 bool video_decoder::ready() const{return impl_->ready();}\r
 153 int64_t video_decoder::nb_frames() const{return impl_->nb_frames();}\r
 154 size_t video_decoder::width() const{return impl_->width_;}\r
 155 size_t video_decoder::height() const{return impl_->height_;}\r
 156 bool    video_decoder::is_progressive() const{return impl_->is_progressive_;}\r
 157 size_t video_decoder::file_frame_number() const{return impl_->file_frame_number_;}\r
 158 \r
 159 }}