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         int                                                                             index_;\r
  57         const spl::shared_ptr<AVCodecContext>   codec_context_;\r
  58 \r
  59         std::queue<spl::shared_ptr<AVPacket>>   packets_;\r
  60         \r
  61         const uint32_t                                                  nb_frames_;\r
  62 \r
  63         const int                                                               width_;\r
  64         const int                                                               height_;\r
  65         bool                                                                    is_progressive_;\r
  66 \r
  67         tbb::atomic<uint32_t>                                   file_frame_number_;\r
  68 \r
  69 public:\r
  70         explicit impl(const spl::shared_ptr<AVFormatContext>& context, const spl::shared_ptr<core::frame_factory>& frame_factory) \r
  71                 : codec_context_(open_codec(*context, AVMEDIA_TYPE_VIDEO, index_))\r
  72                 , nb_frames_(static_cast<uint32_t>(context->streams[index_]->nb_frames))\r
  73                 , width_(codec_context_->width)\r
  74                 , height_(codec_context_->height)\r
  75         {\r
  76                 file_frame_number_ = 0;\r
  77 \r
  78                 // Reserve some frames\r
  79                 std::vector<spl::shared_ptr<core::write_frame>> frames;\r
  80                 for(int n = 0; n < 3; ++n)\r
  81                         frames.push_back(frame_factory->create_frame(this, get_pixel_format_desc(codec_context_->pix_fmt, codec_context_->width, codec_context_->height)));\r
  82         }\r
  83 \r
  84         void push(const std::shared_ptr<AVPacket>& packet)\r
  85         {\r
  86                 if(!packet)\r
  87                         return;\r
  88 \r
  89                 if(packet->stream_index == index_ || packet->data == nullptr)\r
  90                         packets_.push(spl::make_shared_ptr(packet));\r
  91         }\r
  92 \r
  93         std::shared_ptr<AVFrame> poll()\r
  94         {               \r
  95                 if(packets_.empty())\r
  96                         return nullptr;\r
  97                 \r
  98                 auto packet = packets_.front();\r
  99                                         \r
 100                 if(packet->data == nullptr)\r
 101                 {                       \r
 102                         if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
 103                         {\r
 104                                 auto video = decode(*packet);\r
 105                                 if(video)\r
 106                                         return video;\r
 107                         }\r
 108                                         \r
 109                         packets_.pop();\r
 110                         file_frame_number_ = static_cast<uint32_t>(packet->pos);\r
 111                         avcodec_flush_buffers(codec_context_.get());\r
 112                         return flush_video();   \r
 113                 }\r
 114                         \r
 115                 packets_.pop();\r
 116                 return decode(*packet);\r
 117         }\r
 118 \r
 119         std::shared_ptr<AVFrame> decode(AVPacket& pkt)\r
 120         {\r
 121                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 122 \r
 123                 int frame_finished = 0;\r
 124                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &pkt), "[video_decocer]");\r
 125                 \r
 126                 // If a decoder consumes less then the whole packet then something is wrong\r
 127                 // that might be just harmless padding at the end, or a problem with the\r
 128                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 129 \r
 130                 if(frame_finished == 0) \r
 131                         return nullptr;\r
 132 \r
 133                 is_progressive_ = !decoded_frame->interlaced_frame;\r
 134 \r
 135                 if(decoded_frame->repeat_pict > 0)\r
 136                         CASPAR_LOG(warning) << "[video_decoder] Field repeat_pict not implemented.";\r
 137                 \r
 138                 ++file_frame_number_;\r
 139 \r
 140                 return decoded_frame;\r
 141         }\r
 142         \r
 143         bool ready() const\r
 144         {\r
 145                 return packets_.size() >= 8;\r
 146         }\r
 147 \r
 148         uint32_t nb_frames() const\r
 149         {\r
 150                 return std::max<uint32_t>(nb_frames_, file_frame_number_);\r
 151         }\r
 152 \r
 153         std::wstring print() const\r
 154         {               \r
 155                 return L"[video-decoder] " + u16(codec_context_->codec->long_name);\r
 156         }\r
 157 };\r
 158 \r
 159 video_decoder::video_decoder(const spl::shared_ptr<AVFormatContext>& context, const spl::shared_ptr<core::frame_factory>& frame_factory) : impl_(new impl(context, frame_factory)){}\r
 160 void video_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}\r
 161 std::shared_ptr<AVFrame> video_decoder::poll(){return impl_->poll();}\r
 162 bool video_decoder::ready() const{return impl_->ready();}\r
 163 int video_decoder::width() const{return impl_->width_;}\r
 164 int video_decoder::height() const{return impl_->height_;}\r
 165 uint32_t video_decoder::nb_frames() const{return impl_->nb_frames();}\r
 166 uint32_t video_decoder::file_frame_number() const{return impl_->file_frame_number_;}\r
 167 bool    video_decoder::is_progressive() const{return impl_->is_progressive_;}\r
 168 std::wstring video_decoder::print() const{return impl_->print();}\r
 169 \r
 170 }}