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 "../../ffmpeg_error.h"\r
  24 #include "../../util/util.h"\r
  25 #include "../../util/filter.h"\r
  26 \r
  27 #include <common/memory/memcpy.h>\r
  28 \r
  29 #include <core/video_format.h>\r
  30 #include <core/producer/frame/basic_frame.h>\r
  31 #include <core/mixer/write_frame.h>\r
  32 #include <core/producer/frame/image_transform.h>\r
  33 #include <core/producer/frame/pixel_format.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 <libswscale/swscale.h>\r
  49         #include <libavformat/avformat.h>\r
  50         #include <libavcodec/avcodec.h>\r
  51 }\r
  52 #if defined(_MSC_VER)\r
  53 #pragma warning (pop)\r
  54 #endif\r
  55 \r
  56 namespace caspar {\r
  57         \r
  58 struct video_decoder::implementation : boost::noncopyable\r
  59 {\r
  60         input& input_;\r
  61         std::shared_ptr<SwsContext>                                     sws_context_;\r
  62         const safe_ptr<core::frame_factory>                     frame_factory_;\r
  63         AVCodecContext&                                                         codec_context_;\r
  64         const int                                                                       width_;\r
  65         const int                                                                       height_;\r
  66         const PixelFormat                                                       pix_fmt_;\r
  67         core::pixel_format_desc                                         desc_;\r
  68         size_t                                                                          frame_number_;\r
  69         std::shared_ptr<filter>                                         filter_;\r
  70 \r
  71 public:\r
  72         explicit implementation(input& input, const safe_ptr<core::frame_factory>& frame_factory, const std::string& filter_str) \r
  73                 : input_(input)\r
  74                 , frame_factory_(frame_factory)\r
  75                 , codec_context_(*input_.get_video_codec_context())\r
  76                 , width_(codec_context_.width)\r
  77                 , height_(codec_context_.height)\r
  78                 , pix_fmt_(codec_context_.pix_fmt)\r
  79                 , desc_(get_pixel_format_desc(pix_fmt_, width_, height_))\r
  80                 , frame_number_(0)\r
  81         {\r
  82                 if(desc_.pix_fmt == core::pixel_format::invalid)\r
  83                 {\r
  84                         CASPAR_LOG(warning) << "Hardware accelerated color transform not supported.";\r
  85 \r
  86                         desc_ = get_pixel_format_desc(PIX_FMT_BGRA, width_, height_);\r
  87                         double param;\r
  88                         sws_context_.reset(sws_getContext(width_, height_, pix_fmt_, width_, height_, PIX_FMT_BGRA, SWS_BILINEAR, nullptr, nullptr, &param), sws_freeContext);\r
  89                         if(!sws_context_)\r
  90                                 BOOST_THROW_EXCEPTION(operation_failed() <<\r
  91                                                                           msg_info("Could not create software scaling context.") << \r
  92                                                                           boost::errinfo_api_function("sws_getContext"));\r
  93                 }\r
  94 \r
  95                 if(!filter_str.empty())\r
  96                         filter_.reset(new filter(filter_str));\r
  97         }\r
  98 \r
  99         std::deque<std::pair<int, safe_ptr<core::write_frame>>> receive()\r
 100         {\r
 101                 std::deque<std::pair<int, safe_ptr<core::write_frame>>> result;\r
 102                 \r
 103                 std::shared_ptr<AVPacket> pkt;\r
 104                 for(int n = 0; n < 32 && result.empty() && input_.try_pop_video_packet(pkt); ++n)       \r
 105                         boost::range::push_back(result, decode(pkt));\r
 106 \r
 107                 return result;\r
 108         }\r
 109 \r
 110         std::deque<std::pair<int, safe_ptr<core::write_frame>>> decode(const std::shared_ptr<AVPacket>& video_packet)\r
 111         {                       \r
 112                 std::deque<std::pair<int, safe_ptr<core::write_frame>>> result;\r
 113 \r
 114                 if(!video_packet) // eof\r
 115                 {       \r
 116                         avcodec_flush_buffers(&codec_context_);\r
 117                         frame_number_ = 0;\r
 118                         return result;\r
 119                 }\r
 120 \r
 121                 safe_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 122 \r
 123                 int frame_finished = 0;\r
 124                 const int errn = avcodec_decode_video2(&codec_context_, decoded_frame.get(), &frame_finished, video_packet.get());\r
 125                 \r
 126                 if(errn < 0)\r
 127                 {\r
 128                         BOOST_THROW_EXCEPTION(\r
 129                                 invalid_operation() <<\r
 130                                 msg_info(av_error_str(errn)) <<\r
 131                                 boost::errinfo_api_function("avcodec_decode_video") <<\r
 132                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 133                 }\r
 134                 \r
 135                 if(frame_finished != 0)         \r
 136                 {\r
 137                         if(filter_)\r
 138                         {\r
 139                                 filter_->push(decoded_frame);\r
 140 \r
 141                                 std::shared_ptr<AVFrame> frame;\r
 142                                 while(filter_->try_pop(frame))\r
 143                                         result.push_back(std::make_pair(frame_number_, make_write_frame(make_safe(frame))));\r
 144                         }\r
 145                         else\r
 146                                 result.push_back(std::make_pair(frame_number_, make_write_frame(decoded_frame)));\r
 147                         \r
 148                         if(!result.empty())\r
 149                                 ++frame_number_;\r
 150                         else\r
 151                                 CASPAR_LOG(trace) << " Filter delay.";\r
 152                 }\r
 153                 else\r
 154                         CASPAR_LOG(trace) << " Decoder delay.";\r
 155 \r
 156                 return result;\r
 157         }\r
 158 \r
 159         safe_ptr<core::write_frame> make_write_frame(safe_ptr<AVFrame> decoded_frame)\r
 160         {               \r
 161                 auto write = frame_factory_->create_frame(this, desc_);\r
 162                 write->set_is_interlaced(decoded_frame->interlaced_frame != 0);\r
 163 \r
 164                 if(sws_context_ == nullptr)\r
 165                 {\r
 166                         tbb::parallel_for(0, static_cast<int>(desc_.planes.size()), 1, [&](int n)\r
 167                         {\r
 168                                 auto plane            = desc_.planes[n];\r
 169                                 auto result           = write->image_data(n).begin();\r
 170                                 auto decoded          = decoded_frame->data[n];\r
 171                                 auto decoded_linesize = decoded_frame->linesize[n];\r
 172                                 \r
 173                                 // Copy line by line since ffmpeg sometimes pads each line.\r
 174                                 tbb::parallel_for(tbb::blocked_range<size_t>(0, static_cast<int>(desc_.planes[n].height)), [&](const tbb::blocked_range<size_t>& r)\r
 175                                 {\r
 176                                         for(size_t y = r.begin(); y != r.end(); ++y)\r
 177                                                 memcpy(result + y*plane.linesize, decoded + y*decoded_linesize, plane.linesize);\r
 178                                 });\r
 179 \r
 180                                 write->commit(n);\r
 181                         });\r
 182                 }\r
 183                 else\r
 184                 {\r
 185                         // Use sws_scale when provided colorspace has no hw-accel.\r
 186                         safe_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);     \r
 187                         avcodec_get_frame_defaults(av_frame.get());                     \r
 188                         avpicture_fill(reinterpret_cast<AVPicture*>(av_frame.get()), write->image_data().begin(), PIX_FMT_BGRA, width_, height_);\r
 189                  \r
 190                         sws_scale(sws_context_.get(), decoded_frame->data, decoded_frame->linesize, 0, height_, av_frame->data, av_frame->linesize);    \r
 191 \r
 192                         write->commit();\r
 193                 }       \r
 194 \r
 195                 // DVVIDEO is in lower field. Make it upper field if needed.\r
 196                 if(codec_context_.codec_id == CODEC_ID_DVVIDEO && frame_factory_->get_video_format_desc().mode == core::video_mode::upper)\r
 197                         write->get_image_transform().set_fill_translation(0.0f, 0.5/static_cast<double>(height_));\r
 198 \r
 199                 return write;\r
 200         }\r
 201 };\r
 202 \r
 203 video_decoder::video_decoder(input& input, const safe_ptr<core::frame_factory>& frame_factory, const std::string& filter) : impl_(new implementation(input, frame_factory, filter)){}\r
 204 std::deque<std::pair<int, safe_ptr<core::write_frame>>> video_decoder::receive(){return impl_->receive();}\r
 205 \r
 206 }