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 <common/log.h>\r
  31 #include <core/frame/frame_transform.h>\r
  32 #include <core/frame/frame_factory.h>\r
  33 \r
  34 #include <boost/range/algorithm_ext/push_back.hpp>\r
  35 #include <boost/filesystem.hpp>\r
  36 \r
  37 #include <queue>\r
  38 \r
  39 #if defined(_MSC_VER)\r
  40 #pragma warning (push)\r
  41 #pragma warning (disable : 4244)\r
  42 #endif\r
  43 extern "C" \r
  44 {\r
  45         #include <libavcodec/avcodec.h>\r
  46         #include <libavformat/avformat.h>\r
  47 }\r
  48 #if defined(_MSC_VER)\r
  49 #pragma warning (pop)\r
  50 #endif\r
  51 \r
  52 namespace caspar { namespace ffmpeg {\r
  53         \r
  54 struct video_decoder::impl : boost::noncopyable\r
  55 {\r
  56         monitor::basic_subject                                  event_subject_;\r
  57         int                                                                             index_;\r
  58         const std::shared_ptr<AVCodecContext>   codec_context_;\r
  59 \r
  60         std::queue<spl::shared_ptr<AVPacket>>   packets_;\r
  61         \r
  62         const uint32_t                                                  nb_frames_;\r
  63 \r
  64         const int                                                               width_;\r
  65         const int                                                               height_;\r
  66         bool                                                                    is_progressive_;\r
  67 \r
  68         uint32_t                                                                file_frame_number_;\r
  69 \r
  70 public:\r
  71         explicit impl() \r
  72                 : index_(0)\r
  73                 , nb_frames_(0)\r
  74                 , width_(0)\r
  75                 , height_(0)\r
  76                 , is_progressive_(true)\r
  77                 , file_frame_number_(0)\r
  78         {\r
  79         }\r
  80 \r
  81         explicit impl(const spl::shared_ptr<AVFormatContext>& context) \r
  82                 : codec_context_(open_codec(*context, AVMEDIA_TYPE_VIDEO, index_))\r
  83                 , nb_frames_(static_cast<uint32_t>(context->streams[index_]->nb_frames))\r
  84                 , width_(codec_context_->width)\r
  85                 , height_(codec_context_->height)\r
  86         {\r
  87                 file_frame_number_ = 0;\r
  88         }\r
  89 \r
  90         void push(const std::shared_ptr<AVPacket>& packet)\r
  91         {\r
  92                 if(!packet || !codec_context_)\r
  93                         return;\r
  94 \r
  95                 if(packet->stream_index == index_ || packet->data == nullptr)\r
  96                         packets_.push(spl::make_shared_ptr(packet));\r
  97         }\r
  98 \r
  99         std::shared_ptr<AVFrame> poll()\r
 100         {               \r
 101                 if(!codec_context_)\r
 102                         return empty_video();\r
 103 \r
 104                 if(packets_.empty())\r
 105                         return nullptr;\r
 106                 \r
 107                 auto packet = packets_.front();\r
 108                 \r
 109                 if(packet->data == nullptr)\r
 110                 {                       \r
 111                         if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
 112                         {\r
 113                                 auto video = decode(*packet);\r
 114                                 if(video)\r
 115                                         return video;\r
 116                         }\r
 117                                         \r
 118                         packets_.pop();\r
 119                         avcodec_flush_buffers(codec_context_.get());                            \r
 120                         return nullptr; \r
 121                 }\r
 122                         \r
 123                 packets_.pop();\r
 124                 return decode(*packet);         \r
 125         }\r
 126 \r
 127         std::shared_ptr<AVFrame> decode(AVPacket& pkt)\r
 128         {\r
 129                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 130 \r
 131                 int frame_finished = 0;\r
 132                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &pkt), "[video_decocer]");\r
 133                 \r
 134                 // If a decoder consumes less then the whole packet then something is wrong\r
 135                 // that might be just harmless padding at the end, or a problem with the\r
 136                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 137 \r
 138                 if(frame_finished == 0) \r
 139                         return nullptr;\r
 140 \r
 141                 is_progressive_ = !decoded_frame->interlaced_frame;\r
 142 \r
 143                 if(decoded_frame->repeat_pict > 0)\r
 144                         CASPAR_LOG(warning) << "[video_decoder] Field repeat_pict not implemented.";\r
 145                                 \r
 146                 event_subject_  << monitor::event("file/video/width")   % width_\r
 147                                                 << monitor::event("file/video/height")  % height_\r
 148                                                 << monitor::event("file/video/field")   % u8(!decoded_frame->interlaced_frame ? "progressive" : (decoded_frame->top_field_first ? "upper" : "lower"))\r
 149                                                 << monitor::event("file/video/codec")   % u8(codec_context_->codec->long_name);\r
 150                 \r
 151                 file_frame_number_ = static_cast<uint32_t>(pkt.pts);\r
 152 \r
 153                 decoded_frame->pts = file_frame_number_;\r
 154 \r
 155                 return decoded_frame;\r
 156         }\r
 157         \r
 158         bool ready() const\r
 159         {\r
 160                 return !codec_context_ || !packets_.empty();\r
 161         }\r
 162 \r
 163         void clear()\r
 164         {\r
 165                 while(!packets_.empty())\r
 166                         packets_.pop();\r
 167         }\r
 168 \r
 169         uint32_t nb_frames() const\r
 170         {\r
 171                 return std::max<uint32_t>(nb_frames_, file_frame_number_);\r
 172         }\r
 173 \r
 174         std::wstring print() const\r
 175         {               \r
 176                 return L"[video-decoder] " + u16(codec_context_->codec->long_name);\r
 177         }\r
 178 };\r
 179 \r
 180 video_decoder::video_decoder() : impl_(new impl()){}\r
 181 video_decoder::video_decoder(const spl::shared_ptr<AVFormatContext>& context) : impl_(new impl(context)){}\r
 182 video_decoder::video_decoder(video_decoder&& other) : impl_(std::move(other.impl_)){}\r
 183 video_decoder& video_decoder::operator=(video_decoder&& other){impl_ = std::move(other.impl_); return *this;}\r
 184 void video_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 185 std::shared_ptr<AVFrame> video_decoder::poll(){return impl_->poll();}\r
 186 bool video_decoder::ready() const{return impl_->ready();}\r
 187 int video_decoder::width() const{return impl_->width_;}\r
 188 int video_decoder::height() const{return impl_->height_;}\r
 189 uint32_t video_decoder::nb_frames() const{return impl_->nb_frames();}\r
 190 uint32_t video_decoder::file_frame_number() const{return impl_->file_frame_number_;}\r
 191 bool    video_decoder::is_progressive() const{return impl_->is_progressive_;}\r
 192 std::wstring video_decoder::print() const{return impl_->print();}\r
 193 void video_decoder::clear(){impl_->clear();}\r
 194 void video_decoder::subscribe(const monitor::observable::observer_ptr& o){impl_->event_subject_.subscribe(o);}\r
 195 void video_decoder::unsubscribe(const monitor::observable::observer_ptr& o){impl_->event_subject_.unsubscribe(o);}\r
 196 \r
 197 }}