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

   1 /*\r
   2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 *  This file is part of CasparCG.\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 */\r
  20 #include "../../stdafx.h"\r
  21 \r
  22 #include "video_decoder.h"\r
  23 #include "../util.h"\r
  24 \r
  25 #include "../../ffmpeg_error.h"\r
  26 #include "../filter/filter.h"\r
  27 \r
  28 #include <common/memory/memcpy.h>\r
  29 \r
  30 #include <core/video_format.h>\r
  31 #include <core/producer/frame/basic_frame.h>\r
  32 #include <core/mixer/write_frame.h>\r
  33 #include <core/producer/frame/image_transform.h>\r
  34 #include <core/producer/frame/frame_factory.h>\r
  35 \r
  36 #include <tbb/parallel_for.h>\r
  37 \r
  38 #include <boost/range/algorithm_ext.hpp>\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         #define __STDC_CONSTANT_MACROS\r
  47         #define __STDC_LIMIT_MACROS\r
  48         #include <libavformat/avformat.h>\r
  49         #include <libavcodec/avcodec.h>\r
  50 }\r
  51 #if defined(_MSC_VER)\r
  52 #pragma warning (pop)\r
  53 #endif\r
  54 \r
  55 namespace caspar {\r
  56                 \r
  57 struct video_decoder::implementation : boost::noncopyable\r
  58 {\r
  59         input& input_;\r
  60         const safe_ptr<core::frame_factory>             frame_factory_;\r
  61         AVCodecContext&                                                 codec_context_;\r
  62         size_t                                                                  frame_number_;\r
  63 \r
  64         std::shared_ptr<filter>                                 filter_;\r
  65         int                                                                             eof_count_;\r
  66 \r
  67         std::string                                                             filter_str_;\r
  68 \r
  69 public:\r
  70         explicit implementation(input& input, const safe_ptr<core::frame_factory>& frame_factory, const std::string& filter_str) \r
  71                 : input_(input)\r
  72                 , frame_factory_(frame_factory)\r
  73                 , codec_context_(*input_.get_video_codec_context())\r
  74                 , frame_number_(0)\r
  75                 , filter_(filter_str.empty() ? nullptr : new filter(filter_str))\r
  76                 , filter_str_(filter_str)\r
  77                 , eof_count_(std::numeric_limits<int>::max())\r
  78         {\r
  79         }\r
  80 \r
  81         std::deque<std::pair<int, safe_ptr<core::write_frame>>> receive()\r
  82         {\r
  83                 std::deque<std::pair<int, safe_ptr<core::write_frame>>> result;\r
  84                 \r
  85                 std::shared_ptr<AVPacket> pkt;\r
  86                 for(int n = 0; n < 32 && result.empty() && input_.try_pop_video_packet(pkt); ++n)       \r
  87                         boost::range::push_back(result, decode(pkt));\r
  88 \r
  89                 return result;\r
  90         }\r
  91 \r
  92         std::deque<std::pair<int, safe_ptr<core::write_frame>>> decode(const std::shared_ptr<AVPacket>& video_packet)\r
  93         {                       \r
  94                 std::deque<std::pair<int, safe_ptr<core::write_frame>>> result;\r
  95 \r
  96                 if(!video_packet) // eof\r
  97                 {\r
  98                         eof_count_ = frame_number_ + (filter_ ? filter_->delay()+1 : 0);\r
  99                         avcodec_flush_buffers(&codec_context_);\r
 100                         return result;\r
 101                 }               \r
 102                 \r
 103                 frame_number_ = frame_number_ % eof_count_;\r
 104                 \r
 105                 const void* tag = this;\r
 106 \r
 107                 if(filter_)\r
 108                 {                                                       \r
 109                         std::shared_ptr<AVFrame> frame;\r
 110                 \r
 111                         tbb::parallel_invoke(\r
 112                         [&]\r
 113                         {\r
 114                                 frame = decode_frame(video_packet);\r
 115                         },\r
 116                         [&]\r
 117                         {               \r
 118                                 boost::range::transform(filter_->poll(), std::back_inserter(result), [&](const safe_ptr<AVFrame>& frame)\r
 119                                 {\r
 120                                         return std::make_pair(frame_number_, make_write_frame(tag, frame, frame_factory_));\r
 121                                 });\r
 122                 \r
 123                                 if(!result.empty())\r
 124                                         ++frame_number_;\r
 125                         });             \r
 126 \r
 127                         if(frame)\r
 128                                 filter_->push(make_safe(frame));\r
 129                 }\r
 130                 else\r
 131                 {\r
 132                         auto frame = decode_frame(video_packet);\r
 133                         \r
 134                         if(frame)\r
 135                                 result.push_back(std::make_pair(frame_number_++, make_write_frame(tag, make_safe(frame), frame_factory_)));\r
 136                 }\r
 137 \r
 138                 return result;\r
 139         }\r
 140                         \r
 141         std::shared_ptr<AVFrame> decode_frame(const std::shared_ptr<AVPacket>& video_packet)\r
 142         {\r
 143                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 144 \r
 145                 int frame_finished = 0;\r
 146                 const int errn = avcodec_decode_video2(&codec_context_, decoded_frame.get(), &frame_finished, video_packet.get());\r
 147                 \r
 148                 if(errn < 0)\r
 149                 {\r
 150                         BOOST_THROW_EXCEPTION(\r
 151                                 invalid_operation() <<\r
 152                                 msg_info(av_error_str(errn)) <<\r
 153                                 boost::errinfo_api_function("avcodec_decode_video") <<\r
 154                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 155                 }\r
 156 \r
 157                 if(frame_finished == 0)         \r
 158                         decoded_frame = nullptr;\r
 159 \r
 160                 return decoded_frame;\r
 161         }\r
 162 };\r
 163 \r
 164 video_decoder::video_decoder(input& input, const safe_ptr<core::frame_factory>& frame_factory, const std::string& filter_str) : impl_(new implementation(input, frame_factory, filter_str)){}\r
 165 std::deque<std::pair<int, safe_ptr<core::write_frame>>> video_decoder::receive(){return impl_->receive();}\r
 166 \r
 167 }