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 std::shared_ptr<core::frame_factory>      frame_factory_;\r
  63         AVCodecContext&                                                         codec_context_;\r
  64         size_t                                                                          frame_number_;\r
  65 \r
  66         std::shared_ptr<filter>                                         filter_;\r
  67         size_t                                                                          filter_delay_;\r
  68 \r
  69         safe_ptr<AVFrame>                                                       last_frame_;\r
  70         std::string filter_str_;\r
  71 \r
  72 public:\r
  73         explicit implementation(input& input, const safe_ptr<core::frame_factory>& frame_factory, const std::string& filter_str) \r
  74                 : input_(input)\r
  75                 , frame_factory_(frame_factory)\r
  76                 , codec_context_(*input_.get_video_codec_context())\r
  77                 , frame_number_(0)\r
  78                 , filter_(filter_str.empty() ? nullptr : new filter(filter_str))\r
  79                 , filter_delay_(0)\r
  80                 , last_frame_(avcodec_alloc_frame(), av_free)\r
  81                 , filter_str_(filter_str)\r
  82         {\r
  83         }\r
  84 \r
  85         std::deque<std::pair<int, safe_ptr<core::write_frame>>> receive()\r
  86         {\r
  87                 std::deque<std::pair<int, safe_ptr<core::write_frame>>> result;\r
  88                 \r
  89                 std::shared_ptr<AVPacket> pkt;\r
  90                 for(int n = 0; n < 32 && result.empty() && input_.try_pop_video_packet(pkt); ++n)       \r
  91                         boost::range::push_back(result, decode(pkt));\r
  92 \r
  93                 return result;\r
  94         }\r
  95 \r
  96         std::deque<std::pair<int, safe_ptr<core::write_frame>>> decode(const std::shared_ptr<AVPacket>& video_packet)\r
  97         {                       \r
  98                 std::deque<std::pair<int, safe_ptr<core::write_frame>>> result;\r
  99 \r
 100                 if(!video_packet) // eof\r
 101                 {       \r
 102                         for(size_t n = 0; n < filter_delay_; ++n)\r
 103                                 boost::range::push_back(result, get_frames(last_frame_));\r
 104                         \r
 105                         // FIXME: Unnecessary reinitialization\r
 106                         filter_.reset(filter_str_.empty() ? nullptr : new filter(filter_str_));\r
 107 \r
 108                         frame_number_ = 0;\r
 109                         filter_delay_ = 0;\r
 110                         avcodec_flush_buffers(&codec_context_);\r
 111 \r
 112                         return result;\r
 113                 }\r
 114 \r
 115                 int frame_finished = 0;\r
 116                 const int errn = avcodec_decode_video2(&codec_context_, last_frame_.get(), &frame_finished, video_packet.get());\r
 117                 \r
 118                 if(errn < 0)\r
 119                 {\r
 120                         BOOST_THROW_EXCEPTION(\r
 121                                 invalid_operation() <<\r
 122                                 msg_info(av_error_str(errn)) <<\r
 123                                 boost::errinfo_api_function("avcodec_decode_video") <<\r
 124                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 125                 }\r
 126                 \r
 127                 if(frame_finished != 0)         \r
 128                         result = get_frames(last_frame_);\r
 129 \r
 130                 return result;\r
 131         }\r
 132 \r
 133         std::deque<std::pair<int, safe_ptr<core::write_frame>>> get_frames(const safe_ptr<AVFrame>& frame)\r
 134         {\r
 135                 std::deque<std::pair<int, safe_ptr<core::write_frame>>> result;\r
 136                         \r
 137                 if(filter_)\r
 138                 {\r
 139                         auto frames = filter_->execute(frame);\r
 140 \r
 141                         boost::range::transform(frames, std::back_inserter(result), [this](const safe_ptr<AVFrame>& frame)\r
 142                         {\r
 143                                 return std::make_pair(frame_number_, make_write_frame(frame));\r
 144                         });\r
 145 \r
 146                         if(!frames.empty())\r
 147                                 ++frame_number_;\r
 148                         else\r
 149                                 ++filter_delay_;\r
 150                 }\r
 151                 else\r
 152                         result.push_back(std::make_pair(frame_number_++, make_write_frame(frame)));\r
 153 \r
 154                 return result;\r
 155         }\r
 156 \r
 157         safe_ptr<core::write_frame> make_write_frame(safe_ptr<AVFrame> decoded_frame)\r
 158         {                       \r
 159                 // We don't know what the filter output might give until we received the first frame. Initialize everything on first frame.\r
 160                 auto width   = decoded_frame->width;\r
 161                 auto height  = decoded_frame->height;\r
 162                 auto pix_fmt = static_cast<PixelFormat>(decoded_frame->format);\r
 163                 auto desc        = get_pixel_format_desc(pix_fmt, width, height);\r
 164                         \r
 165                 if(desc.pix_fmt == core::pixel_format::invalid)\r
 166                 {\r
 167                         CASPAR_VERIFY(!sws_context_); // Initialize only once. Nothing should change while running;\r
 168                         CASPAR_LOG(warning) << "Hardware accelerated color transform not supported.";\r
 169 \r
 170                         desc = get_pixel_format_desc(PIX_FMT_BGRA, width, height);\r
 171                         double param;\r
 172                         sws_context_.reset(sws_getContext(width, height, pix_fmt, width, height, PIX_FMT_BGRA, SWS_BILINEAR, nullptr, nullptr, &param), sws_freeContext);\r
 173                         if(!sws_context_)\r
 174                                 BOOST_THROW_EXCEPTION(operation_failed() <<\r
 175                                                                           msg_info("Could not create software scaling context.") << \r
 176                                                                           boost::errinfo_api_function("sws_getContext"));\r
 177                 }\r
 178 \r
 179                 auto write = frame_factory_->create_frame(this, desc);\r
 180                 write->set_is_interlaced(decoded_frame->interlaced_frame != 0);\r
 181 \r
 182                 if(sws_context_ == nullptr)\r
 183                 {\r
 184                         tbb::parallel_for(0, static_cast<int>(desc.planes.size()), 1, [&](int n)\r
 185                         {\r
 186                                 auto plane            = desc.planes[n];\r
 187                                 auto result           = write->image_data(n).begin();\r
 188                                 auto decoded          = decoded_frame->data[n];\r
 189                                 auto decoded_linesize = decoded_frame->linesize[n];\r
 190                                 \r
 191                                 // Copy line by line since ffmpeg sometimes pads each line.\r
 192                                 tbb::parallel_for(tbb::blocked_range<size_t>(0, static_cast<int>(desc.planes[n].height)), [&](const tbb::blocked_range<size_t>& r)\r
 193                                 {\r
 194                                         for(size_t y = r.begin(); y != r.end(); ++y)\r
 195                                                 memcpy(result + y*plane.linesize, decoded + y*decoded_linesize, plane.linesize);\r
 196                                 });\r
 197 \r
 198                                 write->commit(n);\r
 199                         });\r
 200                 }\r
 201                 else\r
 202                 {\r
 203                         // Use sws_scale when provided colorspace has no hw-accel.\r
 204                         safe_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);     \r
 205                         avcodec_get_frame_defaults(av_frame.get());                     \r
 206                         avpicture_fill(reinterpret_cast<AVPicture*>(av_frame.get()), write->image_data().begin(), PIX_FMT_BGRA, width, height);\r
 207                  \r
 208                         sws_scale(sws_context_.get(), decoded_frame->data, decoded_frame->linesize, 0, height, av_frame->data, av_frame->linesize);     \r
 209 \r
 210                         write->commit();\r
 211                 }       \r
 212 \r
 213                 // Fix field-order if needed. DVVIDEO is in lower field. Make it upper field if needed.\r
 214                 if(decoded_frame->interlaced_frame)\r
 215                 {\r
 216                         switch(frame_factory_->get_video_format_desc().mode)\r
 217                         {\r
 218                         case core::video_mode::upper:\r
 219                                 if(!decoded_frame->top_field_first)\r
 220                                         write->get_image_transform().set_fill_translation(0.0f, 0.5/static_cast<double>(height));\r
 221                                 break;\r
 222                         case core::video_mode::lower:\r
 223                                 if(decoded_frame->top_field_first)\r
 224                                         write->get_image_transform().set_fill_translation(0.0f, -0.5/static_cast<double>(height));\r
 225                                 break;\r
 226                         }\r
 227                 }\r
 228 \r
 229                 return write;\r
 230         }\r
 231 };\r
 232 \r
 233 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
 234 std::deque<std::pair<int, safe_ptr<core::write_frame>>> video_decoder::receive(){return impl_->receive();}\r
 235 \r
 236 }