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 #include "../input/input.h"\r
  28 \r
  29 #include "../../ffmpeg_error.h"\r
  30 \r
  31 #include <common/log.h>\r
  32 #include <core/frame/frame_transform.h>\r
  33 #include <core/frame/frame_factory.h>\r
  34 \r
  35 #include <boost/range/algorithm_ext/push_back.hpp>\r
  36 #include <boost/filesystem.hpp>\r
  37 \r
  38 #include <queue>\r
  39 \r
  40 #if defined(_MSC_VER)\r
  41 #pragma warning (push)\r
  42 #pragma warning (disable : 4244)\r
  43 #endif\r
  44 extern "C" \r
  45 {\r
  46         #include <libavcodec/avcodec.h>\r
  47         #include <libavformat/avformat.h>\r
  48 }\r
  49 #if defined(_MSC_VER)\r
  50 #pragma warning (pop)\r
  51 #endif\r
  52 \r
  53 namespace caspar { namespace ffmpeg {\r
  54         \r
  55 struct video_decoder::impl : boost::noncopyable\r
  56 {\r
  57         monitor::basic_subject                                  event_subject_;\r
  58         input*                                                                  input_;\r
  59         int                                                                             index_;\r
  60         const std::shared_ptr<AVCodecContext>   codec_context_;\r
  61 \r
  62         std::queue<spl::shared_ptr<AVPacket>>   packets_;\r
  63         \r
  64         const uint32_t                                                  nb_frames_;\r
  65 \r
  66         const int                                                               width_;\r
  67         const int                                                               height_;\r
  68         bool                                                                    is_progressive_;\r
  69         uint32_t                                                                file_frame_number_;\r
  70         double                                                                  fps_;\r
  71 \r
  72 public:\r
  73         explicit impl() \r
  74                 : input_(nullptr)\r
  75                 , nb_frames_(0)\r
  76                 , width_(0)\r
  77                 , height_(0)\r
  78                 , file_frame_number_(0)\r
  79                 , fps_(0.0)\r
  80         {\r
  81         }\r
  82 \r
  83         explicit impl(input& in) \r
  84                 : input_(&in)\r
  85                 , codec_context_(open_codec(*input_->context(), AVMEDIA_TYPE_VIDEO, index_))\r
  86                 , nb_frames_(static_cast<uint32_t>(input_->context()->streams[index_]->nb_frames))\r
  87                 , width_(codec_context_->width)\r
  88                 , height_(codec_context_->height)\r
  89                 , file_frame_number_(0)\r
  90                 , fps_(read_fps(*input_->context(), 0.0))\r
  91         {\r
  92         }\r
  93         \r
  94         std::shared_ptr<AVFrame> poll()\r
  95         {                       \r
  96                 if(!codec_context_)\r
  97                         return empty_video();\r
  98 \r
  99                 std::shared_ptr<AVPacket> packet;\r
 100                 if(!input_->try_pop_video(packet))\r
 101                         return nullptr;\r
 102 \r
 103                 if(packet == flush_packet())\r
 104                 {\r
 105                         avcodec_flush_buffers(codec_context_.get());\r
 106                         return nullptr;\r
 107                 }\r
 108                 else if(packet == null_packet())\r
 109                 {\r
 110                         if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
 111                         {\r
 112                                 AVPacket pkt;                \r
 113                                 av_init_packet(&pkt);\r
 114                 pkt.data = nullptr;\r
 115                 pkt.size = 0;\r
 116                                 return decode(pkt);\r
 117                         }\r
 118                         return nullptr;\r
 119                 }\r
 120                 \r
 121                 return decode(*packet);\r
 122         }\r
 123 \r
 124         std::shared_ptr<AVFrame> decode(AVPacket& pkt)\r
 125         {\r
 126                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 127 \r
 128                 int frame_finished = 0;\r
 129                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &pkt), "[video_decocer]");\r
 130                 \r
 131                 // If a decoder consumes less then the whole packet then something is wrong\r
 132                 // that might be just harmless padding at the end, or a problem with the\r
 133                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 134 \r
 135                 if(frame_finished == 0) \r
 136                         return nullptr;\r
 137                 \r
 138                 auto stream_time_base = input_->context()->streams[pkt.stream_index]->time_base;\r
 139                 auto packet_frame_number = static_cast<uint32_t>((static_cast<double>(pkt.pts * stream_time_base.num)/stream_time_base.den)*fps_);\r
 140 \r
 141                 file_frame_number_ = packet_frame_number;\r
 142 \r
 143                 is_progressive_ = !decoded_frame->interlaced_frame;\r
 144 \r
 145                 if(decoded_frame->repeat_pict > 0)\r
 146                         CASPAR_LOG(warning) << "[video_decoder] Field repeat_pict not implemented.";\r
 147                                 \r
 148                 event_subject_  << monitor::event("file/video/width")   % width_\r
 149                                                 << monitor::event("file/video/height")  % height_\r
 150                                                 << monitor::event("file/video/field")   % u8(!decoded_frame->interlaced_frame ? "progressive" : (decoded_frame->top_field_first ? "upper" : "lower"))\r
 151                                                 << monitor::event("file/video/codec")   % u8(codec_context_->codec->long_name);\r
 152                 \r
 153                 return decoded_frame;\r
 154         }\r
 155         \r
 156         uint32_t nb_frames() const\r
 157         {\r
 158                 return std::max(nb_frames_, file_frame_number_);\r
 159         }\r
 160 \r
 161         std::wstring print() const\r
 162         {               \r
 163                 return L"[video-decoder] " + u16(codec_context_->codec->long_name);\r
 164         }\r
 165 };\r
 166 \r
 167 video_decoder::video_decoder() : impl_(new impl()){}\r
 168 video_decoder::video_decoder(input& in) : impl_(new impl(in)){}\r
 169 video_decoder::video_decoder(video_decoder&& other) : impl_(std::move(other.impl_)){}\r
 170 video_decoder& video_decoder::operator=(video_decoder&& other){impl_ = std::move(other.impl_); return *this;}\r
 171 std::shared_ptr<AVFrame> video_decoder::operator()(){return impl_->poll();}\r
 172 int video_decoder::width() const{return impl_->width_;}\r
 173 int video_decoder::height() const{return impl_->height_;}\r
 174 uint32_t video_decoder::nb_frames() const{return impl_->nb_frames();}\r
 175 uint32_t video_decoder::file_frame_number() const{return impl_->file_frame_number_;}\r
 176 bool video_decoder::is_progressive() const{return impl_->is_progressive_;}\r
 177 std::wstring video_decoder::print() const{return impl_->print();}\r
 178 void video_decoder::subscribe(const monitor::observable::observer_ptr& o){impl_->event_subject_.subscribe(o);}\r
 179 void video_decoder::unsubscribe(const monitor::observable::observer_ptr& o){impl_->event_subject_.unsubscribe(o);}\r
 180 \r
 181 }}