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 \r
  24 #include "../util.h"\r
  25 #include "../filter/filter.h"\r
  26 \r
  27 #include "../../ffmpeg_error.h"\r
  28 \r
  29 #include <core/producer/frame/basic_frame.h>\r
  30 #include <common/memory/memcpy.h>\r
  31 \r
  32 #if defined(_MSC_VER)\r
  33 #pragma warning (push)\r
  34 #pragma warning (disable : 4244)\r
  35 #endif\r
  36 extern "C" \r
  37 {\r
  38         #include <libavcodec/avcodec.h>\r
  39         #include <libavformat/avformat.h>\r
  40 }\r
  41 #if defined(_MSC_VER)\r
  42 #pragma warning (pop)\r
  43 #endif\r
  44 \r
  45 #include <connect.h>\r
  46 #include <semaphore.h>\r
  47 \r
  48 #include <tbb/scalable_allocator.h>\r
  49 \r
  50 using namespace Concurrency;\r
  51 \r
  52 namespace caspar { namespace ffmpeg {\r
  53         \r
  54 struct video_decoder::implementation : public Concurrency::agent, boost::noncopyable\r
  55 {       \r
  56         int                                                                             index_;\r
  57         std::shared_ptr<AVCodecContext>                 codec_context_;\r
  58         \r
  59         double                                                                  fps_;\r
  60         int64_t                                                                 nb_frames_;\r
  61 \r
  62         size_t                                                                  width_;\r
  63         size_t                                                                  height_;\r
  64         bool                                                                    is_progressive_;\r
  65         \r
  66         overwrite_buffer<bool>                                  is_running_;\r
  67         unbounded_buffer<safe_ptr<AVPacket>>    source_;\r
  68         ITarget<safe_ptr<AVFrame>>&                             target_;\r
  69         \r
  70 public:\r
  71         explicit implementation(video_decoder::source_t& source, video_decoder::target_t& target, AVFormatContext& context) \r
  72                 : codec_context_(open_codec(context, AVMEDIA_TYPE_VIDEO, index_))\r
  73                 , fps_(static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num))\r
  74                 , nb_frames_(context.streams[index_]->nb_frames)\r
  75                 , width_(codec_context_->width)\r
  76                 , height_(codec_context_->height)\r
  77                 , is_progressive_(true)\r
  78                 , source_([this](const safe_ptr<AVPacket>& packet)\r
  79                         {\r
  80                                 return packet->stream_index == index_;\r
  81                         })\r
  82                 , target_(target)\r
  83         {               \r
  84                 CASPAR_LOG(debug) << "[video_decoder] " << context.streams[index_]->codec->codec->long_name;\r
  85                 \r
  86                 CASPAR_VERIFY(width_ > 0, ffmpeg_error());\r
  87                 CASPAR_VERIFY(height_ > 0, ffmpeg_error());\r
  88 \r
  89                 Concurrency::connect(source, source_);\r
  90 \r
  91                 start();\r
  92         }\r
  93 \r
  94         ~implementation()\r
  95         {\r
  96                 send(is_running_, false);\r
  97                 agent::wait(this);\r
  98         }\r
  99 \r
 100         virtual void run()\r
 101         {\r
 102                 try\r
 103                 {\r
 104                         send(is_running_, true);\r
 105                         while(is_running_.value())\r
 106                         {\r
 107                                 auto packet = receive(source_);\r
 108                         \r
 109                                 if(packet == loop_packet(index_))\r
 110                                 {\r
 111                                         send(target_, loop_video());\r
 112                                         continue;\r
 113                                 }\r
 114 \r
 115                                 if(packet == eof_packet(index_))\r
 116                                         break;\r
 117 \r
 118                                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
 119 \r
 120                                 int frame_finished = 0;\r
 121                                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, packet.get()), "[video_decocer]");\r
 122 \r
 123                                 // 1 packet <=> 1 frame.\r
 124                                 // If a decoder consumes less then the whole packet then something is wrong\r
 125                                 // that might be just harmless padding at the end, or a problem with the\r
 126                                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 127 \r
 128                                 if(frame_finished == 0) \r
 129                                         continue;\r
 130                                 \r
 131                                 if(decoded_frame->repeat_pict > 0)\r
 132                                         CASPAR_LOG(warning) << "[video_decoder]: Field repeat_pict not implemented.";\r
 133                 \r
 134                                 is_progressive_ = decoded_frame->interlaced_frame == 0;\r
 135                                 \r
 136                                 // Need to dupliace frame data since avcodec_decode_video2 reuses it.\r
 137                                 send(target_, dup_frame(make_safe_ptr(decoded_frame)));\r
 138                                 Concurrency::wait(10);\r
 139                         }\r
 140                 }\r
 141                 catch(...)\r
 142                 {\r
 143                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 144                 }\r
 145                 \r
 146                 send(is_running_, false),\r
 147                 send(target_, eof_video());\r
 148 \r
 149                 done();\r
 150         }\r
 151 \r
 152         safe_ptr<AVFrame> dup_frame(const safe_ptr<AVFrame>& frame)\r
 153         {\r
 154                 std::array<uint8_t*, 4> data;\r
 155                 parallel_for(0, 4, [&](int n)\r
 156                 {\r
 157                         data[n] = frame->data[n];\r
 158                         frame->data[n] = reinterpret_cast<uint8_t*>(scalable_aligned_malloc(frame->linesize[n]*frame->height, 32));\r
 159                         memcpy(frame->data[n], data[n], frame->linesize[n]*frame->height);\r
 160                 });\r
 161 \r
 162                 return safe_ptr<AVFrame>(frame.get(), [frame, data](AVFrame*)\r
 163                 {\r
 164                         for(int n = 0; n < 4; ++n)\r
 165                         {\r
 166                                 scalable_aligned_free(frame->data[n]);\r
 167                                 frame->data[n] = data[n];\r
 168                         }\r
 169                 });\r
 170         }\r
 171                 \r
 172         double fps() const\r
 173         {\r
 174                 return fps_;\r
 175         }\r
 176 };\r
 177 \r
 178 video_decoder::video_decoder(video_decoder::source_t& source, video_decoder::target_t& target, AVFormatContext& context) \r
 179         : impl_(new implementation(source, target, context))\r
 180 {\r
 181 }\r
 182 \r
 183 double video_decoder::fps() const{return impl_->fps();}\r
 184 int64_t video_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 185 size_t video_decoder::width() const{return impl_->width_;}\r
 186 size_t video_decoder::height() const{return impl_->height_;}\r
 187 bool video_decoder::is_progressive() const{return impl_->is_progressive_;}\r
 188 \r
 189 }}