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 <tbb/scalable_allocator.h>\r
  46 \r
  47 #undef Yield\r
  48 using namespace Concurrency;\r
  49 \r
  50 namespace caspar { namespace ffmpeg {\r
  51         \r
  52 struct video_decoder::implementation : public Concurrency::agent, boost::noncopyable\r
  53 {       \r
  54         int                                                                             index_;\r
  55         std::shared_ptr<AVCodecContext>                 codec_context_;\r
  56         \r
  57         double                                                                  fps_;\r
  58         int64_t                                                                 nb_frames_;\r
  59 \r
  60         size_t                                                                  width_;\r
  61         size_t                                                                  height_;\r
  62         bool                                                                    is_progressive_;\r
  63         \r
  64         unbounded_buffer<video_decoder::source_element_t>       source_;\r
  65         ITarget<video_decoder::target_element_t>&                       target_;\r
  66         \r
  67 public:\r
  68         explicit implementation(video_decoder::source_t& source, video_decoder::target_t& target, AVFormatContext& context) \r
  69                 : codec_context_(open_codec(context, AVMEDIA_TYPE_VIDEO, index_))\r
  70                 , fps_(static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num))\r
  71                 , nb_frames_(context.streams[index_]->nb_frames)\r
  72                 , width_(codec_context_->width)\r
  73                 , height_(codec_context_->height)\r
  74                 , is_progressive_(true)\r
  75                 , source_([this](const video_decoder::source_element_t& element){return element.first->stream_index == index_;})\r
  76                 , target_(target)\r
  77         {               \r
  78                 CASPAR_LOG(debug) << "[video_decoder] " << context.streams[index_]->codec->codec->long_name;\r
  79                 \r
  80                 CASPAR_VERIFY(width_ > 0, ffmpeg_error());\r
  81                 CASPAR_VERIFY(height_ > 0, ffmpeg_error());\r
  82 \r
  83                 source.link_target(&source_);\r
  84 \r
  85                 start();\r
  86         }\r
  87 \r
  88         ~implementation()\r
  89         {\r
  90                 agent::wait(this);\r
  91         }\r
  92         \r
  93         std::shared_ptr<AVFrame> decode(AVPacket& packet)\r
  94         {\r
  95                 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);\r
  96 \r
  97                 int frame_finished = 0;\r
  98                 THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &packet), "[video_decocer]");\r
  99 \r
 100                 // 1 packet <=> 1 frame.\r
 101                 // If a decoder consumes less then the whole packet then something is wrong\r
 102                 // that might be just harmless padding at the end, or a problem with the\r
 103                 // AVParser or demuxer which puted more then one frame in a AVPacket.\r
 104 \r
 105                 if(frame_finished == 0) \r
 106                         return nullptr;\r
 107                                 \r
 108                 if(decoded_frame->repeat_pict > 0)\r
 109                         CASPAR_LOG(warning) << "[video_decoder]: Field repeat_pict not implemented.";\r
 110 \r
 111                 return decoded_frame;\r
 112         }\r
 113 \r
 114         virtual void run()\r
 115         {\r
 116                 try\r
 117                 {\r
 118                         while(true)\r
 119                         {\r
 120                                 auto element = receive(source_);\r
 121                                 auto packet = element.first;\r
 122                         \r
 123                                 if(packet == loop_packet(index_))\r
 124                                 {                                       \r
 125                                         if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)\r
 126                                         {\r
 127                                                 AVPacket pkt;\r
 128                                                 av_init_packet(&pkt);\r
 129                                                 pkt.data = nullptr;\r
 130                                                 pkt.size = 0;\r
 131 \r
 132                                                 for(auto decoded_frame = decode(pkt); decoded_frame; decoded_frame = decode(pkt))\r
 133                                                 {\r
 134                                                         send(target_, target_element_t(dup_frame(make_safe_ptr(decoded_frame)), element.second));\r
 135                                                         Context::Yield();\r
 136                                                 }\r
 137                                         }\r
 138 \r
 139                                         avcodec_flush_buffers(codec_context_.get());\r
 140                                         send(target_, target_element_t(loop_video(), ticket_t()));\r
 141                                         continue;\r
 142                                 }\r
 143 \r
 144                                 if(packet == eof_packet(index_))\r
 145                                         break;\r
 146 \r
 147                                 auto decoded_frame = decode(*packet);\r
 148                                 if(!decoded_frame)\r
 149                                         continue;\r
 150                 \r
 151                                 is_progressive_ = decoded_frame->interlaced_frame == 0;\r
 152                                 \r
 153                                 // C-TODO: Avoid duplication.\r
 154                                 // Need to dupliace frame data since avcodec_decode_video2 reuses it.\r
 155                                 send(target_, target_element_t(dup_frame(make_safe_ptr(decoded_frame)), element.second));                               \r
 156                                 Context::Yield();\r
 157                         }\r
 158                 }\r
 159                 catch(...)\r
 160                 {\r
 161                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 162                 }\r
 163                 \r
 164                 send(target_, target_element_t(eof_video(), ticket_t()));\r
 165 \r
 166                 done();\r
 167         }\r
 168 \r
 169         safe_ptr<AVFrame> dup_frame(const safe_ptr<AVFrame>& frame)\r
 170         {\r
 171                 auto desc = get_pixel_format_desc(static_cast<PixelFormat>(frame->format), frame->width, frame->height);\r
 172 \r
 173                 auto count = desc.planes.size();\r
 174                 std::array<uint8_t*, 4> org_ptrs;\r
 175                 std::array<uint8_t*, 4> real_ptrs; // We need to store the "real" pointers, due to alignment hack.\r
 176                 parallel_for<size_t>(0, count, [&](size_t n)\r
 177                 {\r
 178                         auto size               = frame->linesize[n]*desc.planes[n].height;\r
 179                         org_ptrs[n]             = frame->data[n];\r
 180                         real_ptrs[n]    = reinterpret_cast<uint8_t*>(scalable_aligned_malloc(size+16, 32)); // Allocate 16 byte extra for alignment hack.\r
 181                         frame->data[n]  = reinterpret_cast<uint8_t*>(fast_memcpy_w_align_hack(real_ptrs[n], org_ptrs[n], size));\r
 182                 });\r
 183 \r
 184                 return safe_ptr<AVFrame>(frame.get(), [frame, org_ptrs, real_ptrs, count](AVFrame*)\r
 185                 {\r
 186                         for(size_t n = 0; n < count; ++n)\r
 187                         {\r
 188                                 scalable_aligned_free(real_ptrs[n]);\r
 189                                 frame->data[n] = org_ptrs[n];\r
 190                         }\r
 191                 });\r
 192         }\r
 193                 \r
 194         double fps() const\r
 195         {\r
 196                 return fps_;\r
 197         }\r
 198 };\r
 199 \r
 200 video_decoder::video_decoder(video_decoder::source_t& source, video_decoder::target_t& target, AVFormatContext& context) \r
 201         : impl_(new implementation(source, target, context))\r
 202 {\r
 203 }\r
 204 \r
 205 double video_decoder::fps() const{return impl_->fps();}\r
 206 int64_t video_decoder::nb_frames() const{return impl_->nb_frames_;}\r
 207 size_t video_decoder::width() const{return impl_->width_;}\r
 208 size_t video_decoder::height() const{return impl_->height_;}\r
 209 bool video_decoder::is_progressive() const{return impl_->is_progressive_;}\r
 210 \r
 211 }}