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 \r
  25 #include <common/memory/memcpy.h>\r
  26 \r
  27 #include <core/video_format.h>\r
  28 #include <core/producer/frame/basic_frame.h>\r
  29 #include <core/producer/frame/write_frame.h>\r
  30 #include <core/producer/frame/image_transform.h>\r
  31 \r
  32 #include <tbb/parallel_for.h>\r
  33 \r
  34 #if defined(_MSC_VER)\r
  35 #pragma warning (push)\r
  36 #pragma warning (disable : 4244)\r
  37 #endif\r
  38 extern "C" \r
  39 {\r
  40         #define __STDC_CONSTANT_MACROS\r
  41         #define __STDC_LIMIT_MACROS\r
  42         #include <libswscale/swscale.h>\r
  43         #include <libavformat/avformat.h>\r
  44 }\r
  45 #if defined(_MSC_VER)\r
  46 #pragma warning (pop)\r
  47 #endif\r
  48 \r
  49 namespace caspar {\r
  50         \r
  51 core::pixel_format::type get_pixel_format(PixelFormat pix_fmt)\r
  52 {\r
  53         switch(pix_fmt)\r
  54         {\r
  55         case PIX_FMT_GRAY8:             return core::pixel_format::gray;\r
  56         case PIX_FMT_BGRA:              return core::pixel_format::bgra;\r
  57         case PIX_FMT_ARGB:              return core::pixel_format::argb;\r
  58         case PIX_FMT_RGBA:              return core::pixel_format::rgba;\r
  59         case PIX_FMT_ABGR:              return core::pixel_format::abgr;\r
  60         case PIX_FMT_YUV444P:   return core::pixel_format::ycbcr;\r
  61         case PIX_FMT_YUV422P:   return core::pixel_format::ycbcr;\r
  62         case PIX_FMT_YUV420P:   return core::pixel_format::ycbcr;\r
  63         case PIX_FMT_YUV411P:   return core::pixel_format::ycbcr;\r
  64         case PIX_FMT_YUV410P:   return core::pixel_format::ycbcr;\r
  65         case PIX_FMT_YUVA420P:  return core::pixel_format::ycbcra;\r
  66         default:                                return core::pixel_format::invalid;\r
  67         }\r
  68 }\r
  69 \r
  70 core::pixel_format_desc get_pixel_format_desc(PixelFormat pix_fmt, size_t width, size_t height)\r
  71 {\r
  72         // Get linesizes\r
  73         AVPicture dummy_pict;   \r
  74         avpicture_fill(&dummy_pict, nullptr, pix_fmt, width, height);\r
  75 \r
  76         core::pixel_format_desc desc;\r
  77         desc.pix_fmt = get_pixel_format(pix_fmt);\r
  78                 \r
  79         switch(desc.pix_fmt)\r
  80         {\r
  81         case core::pixel_format::gray:\r
  82                 {\r
  83                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0]/4, height, 1));                                             \r
  84                         return desc;\r
  85                 }\r
  86         case core::pixel_format::bgra:\r
  87         case core::pixel_format::argb:\r
  88         case core::pixel_format::rgba:\r
  89         case core::pixel_format::abgr:\r
  90                 {\r
  91                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0]/4, height, 4));                                             \r
  92                         return desc;\r
  93                 }\r
  94         case core::pixel_format::ycbcr:\r
  95         case core::pixel_format::ycbcra:\r
  96                 {               \r
  97                         // Find chroma height\r
  98                         size_t size2 = dummy_pict.data[2] - dummy_pict.data[1];\r
  99                         size_t h2 = size2/dummy_pict.linesize[1];                       \r
 100 \r
 101                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[0], height, 1));\r
 102                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[1], h2, 1));\r
 103                         desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[2], h2, 1));\r
 104 \r
 105                         if(desc.pix_fmt == core::pixel_format::ycbcra)                                          \r
 106                                 desc.planes.push_back(core::pixel_format_desc::plane(dummy_pict.linesize[3], height, 1));       \r
 107                         return desc;\r
 108                 }               \r
 109         default:                \r
 110                 desc.pix_fmt = core::pixel_format::invalid;\r
 111                 return desc;\r
 112         }\r
 113 }\r
 114 \r
 115 struct video_decoder::implementation : boost::noncopyable\r
 116 {       \r
 117         std::shared_ptr<SwsContext>                                     sws_context_;\r
 118         const std::shared_ptr<core::frame_factory>      frame_factory_;\r
 119         AVCodecContext*                                                         codec_context_;\r
 120         const int                                                                       width_;\r
 121         const int                                                                       height_;\r
 122         const PixelFormat                                                       pix_fmt_;\r
 123         core::pixel_format_desc                                         desc_;\r
 124 \r
 125 public:\r
 126         explicit implementation(AVCodecContext* codec_context, const safe_ptr<core::frame_factory>& frame_factory) \r
 127                 : frame_factory_(frame_factory)\r
 128                 , codec_context_(codec_context)\r
 129                 , width_(codec_context_->width)\r
 130                 , height_(codec_context_->height)\r
 131                 , pix_fmt_(codec_context_->pix_fmt)\r
 132                 , desc_(get_pixel_format_desc(pix_fmt_, width_, height_))\r
 133         {\r
 134                 if(desc_.pix_fmt == core::pixel_format::invalid)\r
 135                 {\r
 136                         CASPAR_LOG(warning) << "Hardware accelerated color transform not supported.";\r
 137 \r
 138                         desc_ = get_pixel_format_desc(PIX_FMT_BGRA, width_, height_);\r
 139                         double param;\r
 140                         sws_context_.reset(sws_getContext(width_, height_, pix_fmt_, width_, height_, PIX_FMT_BGRA, SWS_BILINEAR, nullptr, nullptr, &param), sws_freeContext);\r
 141                         if(!sws_context_)\r
 142                                 BOOST_THROW_EXCEPTION(operation_failed() <<\r
 143                                                                           msg_info("Could not create software scaling context.") << \r
 144                                                                           boost::errinfo_api_function("sws_getContext"));\r
 145                 }\r
 146         }\r
 147         \r
 148         std::shared_ptr<core::write_frame> execute(void* tag, const std::shared_ptr<aligned_buffer>& video_packet)\r
 149         {                               \r
 150                 if(!video_packet)\r
 151                         return nullptr;\r
 152 \r
 153                 if(video_packet->empty()) // Need to flush\r
 154                 {\r
 155                         avcodec_flush_buffers(codec_context_);\r
 156                         return nullptr;\r
 157                 }\r
 158 \r
 159                 safe_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 160 \r
 161                 int frame_finished = 0;\r
 162                 const int errn = avcodec_decode_video(codec_context_, decoded_frame.get(), &frame_finished, video_packet->data(), video_packet->size());\r
 163                 \r
 164                 if(errn < 0)\r
 165                 {\r
 166                         BOOST_THROW_EXCEPTION(\r
 167                                 invalid_operation() <<\r
 168                                 msg_info(av_error_str(errn)) <<\r
 169                                 boost::errinfo_api_function("avcodec_decode_video") <<\r
 170                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 171                 }\r
 172                 \r
 173                 if(frame_finished == 0)\r
 174                         return nullptr;\r
 175 \r
 176                 auto write = frame_factory_->create_frame(tag, desc_);\r
 177                 if(sws_context_ == nullptr)\r
 178                 {\r
 179                         tbb::parallel_for(0, static_cast<int>(desc_.planes.size()), 1, [&](int n)\r
 180                         {\r
 181                                 auto plane            = desc_.planes[n];\r
 182                                 auto result           = write->image_data(n).begin();\r
 183                                 auto decoded          = decoded_frame->data[n];\r
 184                                 auto decoded_linesize = decoded_frame->linesize[n];\r
 185                                 \r
 186                                 // Copy line by line since ffmpeg sometimes pads each line.\r
 187                                 tbb::parallel_for(0, static_cast<int>(desc_.planes[n].height), 1, [&](int y)\r
 188                                 {\r
 189                                         fast_memcpy(result + y*plane.linesize, decoded + y*decoded_linesize, plane.linesize);\r
 190                                 });\r
 191                         });\r
 192                 }\r
 193                 else\r
 194                 {\r
 195                         // Uses sws_scale when we don't support the provided color-space.\r
 196                         safe_ptr<AVFrame> av_frame(avcodec_alloc_frame(), av_free);     \r
 197                         avcodec_get_frame_defaults(av_frame.get());                     \r
 198                         avpicture_fill(reinterpret_cast<AVPicture*>(av_frame.get()), write->image_data().begin(), PIX_FMT_BGRA, width_, height_);\r
 199                  \r
 200                         sws_scale(sws_context_.get(), decoded_frame->data, decoded_frame->linesize, 0, height_, av_frame->data, av_frame->linesize);    \r
 201                 }       \r
 202 \r
 203                 // DVVIDEO is in lower field. Make it upper field if needed.\r
 204                 if(codec_context_->codec_id == CODEC_ID_DVVIDEO && frame_factory_->get_video_format_desc().mode == core::video_mode::upper)\r
 205                         write->get_image_transform().set_fill_translation(0.0f, 1.0/static_cast<double>(height_));\r
 206 \r
 207                 return write;\r
 208         }\r
 209 };\r
 210 \r
 211 video_decoder::video_decoder(AVCodecContext* codec_context, const safe_ptr<core::frame_factory>& frame_factory) : impl_(new implementation(codec_context, frame_factory)){}\r
 212 std::shared_ptr<core::write_frame> video_decoder::execute(void* tag, const std::shared_ptr<aligned_buffer>& video_packet){return impl_->execute(tag, video_packet);}\r
 213 \r
 214 }