git.sesse.net Git - casparcg/blob - modules/ffmpeg/producer/input.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 #if defined(_MSC_VER)\r
  21 #pragma warning (disable : 4244)\r
  22 #endif\r
  23 \r
  24 #include "..\stdafx.h"\r
  25 \r
  26 #include "input.h"\r
  27 #include "../ffmpeg_error.h"\r
  28 #include "../tbb_avcodec.h"\r
  29 \r
  30 #include <core/video_format.h>\r
  31 \r
  32 #include <common/concurrency/executor.h>\r
  33 #include <common/diagnostics/graph.h>\r
  34 \r
  35 #include <tbb/concurrent_queue.h>\r
  36 #include <tbb/atomic.h>\r
  37 \r
  38 #include <boost/range/algorithm.hpp>\r
  39 #include <boost/thread/condition_variable.hpp>\r
  40 #include <boost/thread/mutex.hpp>\r
  41 #include <boost/range/iterator_range.hpp>\r
  42 \r
  43 extern "C" \r
  44 {\r
  45         #define __STDC_CONSTANT_MACROS\r
  46         #define __STDC_LIMIT_MACROS\r
  47         #include <libavformat/avformat.h>\r
  48 }\r
  49 \r
  50 namespace caspar {\r
  51 \r
  52 static const size_t MAX_BUFFER_COUNT = 128;\r
  53 static const size_t MAX_BUFFER_SIZE  = 32 * 1000000;\r
  54         \r
  55 struct input::implementation : boost::noncopyable\r
  56 {               \r
  57         safe_ptr<diagnostics::graph> graph_;\r
  58 \r
  59         std::shared_ptr<AVFormatContext> format_context_;       // Destroy this last\r
  60                 \r
  61         const std::wstring                      filename_;\r
  62         const bool                                      loop_;\r
  63         const int                                       start_;         \r
  64 \r
  65         size_t                                          buffer_size_limit_;\r
  66         tbb::atomic<size_t>                     buffer_size_;\r
  67         boost::condition_variable       cond_;\r
  68         boost::mutex                            mutex_;\r
  69 \r
  70         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>> buffer_;\r
  71                 \r
  72         executor executor_;\r
  73 public:\r
  74         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start) \r
  75                 : graph_(graph)\r
  76                 , loop_(loop)\r
  77                 , filename_(filename)\r
  78                 , executor_(print())\r
  79                 , start_(std::max(start, 0))\r
  80         {                       \r
  81                 int errn;\r
  82 \r
  83                 AVFormatContext* weak_format_context_ = nullptr;\r
  84                 errn = avformat_open_input(&weak_format_context_, narrow(filename).c_str(), nullptr, nullptr);\r
  85                 if(errn < 0 || weak_format_context_ == nullptr)\r
  86                 {       \r
  87                         BOOST_THROW_EXCEPTION(\r
  88                                 file_read_error() << \r
  89                                 source_info(narrow(print())) << \r
  90                                 msg_info(av_error_str(errn)) <<\r
  91                                 boost::errinfo_api_function("av_open_input_file") <<\r
  92                                 boost::errinfo_errno(AVUNERROR(errn)) <<\r
  93                                 boost::errinfo_file_name(narrow(filename)));\r
  94                 }\r
  95 \r
  96                 format_context_.reset(weak_format_context_, av_close_input_file);\r
  97                         \r
  98                 errn = av_find_stream_info(format_context_.get());\r
  99                 if(errn < 0)\r
 100                 {       \r
 101                         BOOST_THROW_EXCEPTION(\r
 102                                 file_read_error() << \r
 103                                 source_info(narrow(print())) << \r
 104                                 msg_info(av_error_str(errn)) <<\r
 105                                 boost::errinfo_api_function("av_find_stream_info") <<\r
 106                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 107                 }\r
 108                 \r
 109                 if(start_ != 0)                 \r
 110                         seek_frame(start_);\r
 111                 \r
 112                 for(int n = 0; n < 16 && buffer_size_ < MAX_BUFFER_SIZE && buffer_.size() < MAX_BUFFER_COUNT; ++n)\r
 113                         read_next_packet();\r
 114 \r
 115                 buffer_.set_capacity(MAX_BUFFER_COUNT);\r
 116                                 \r
 117                 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));        \r
 118                 graph_->set_color("buffer-count", diagnostics::color(0.2f, 0.8f, 1.0f));\r
 119                 graph_->set_color("buffer-size", diagnostics::color(0.2f, 0.4f, 1.0f)); \r
 120 \r
 121                 executor_.begin_invoke([this]{read_file();});\r
 122                 CASPAR_LOG(info) << print() << " Started.";\r
 123         }\r
 124 \r
 125         ~implementation()\r
 126         {\r
 127                 stop();\r
 128                 // Unblock thread.\r
 129                 std::shared_ptr<AVPacket> packet;\r
 130                 buffer_.try_pop(packet);\r
 131                 buffer_size_ = 0;\r
 132                 cond_.notify_all();\r
 133         }\r
 134                 \r
 135         bool try_pop(std::shared_ptr<AVPacket>& packet)\r
 136         {\r
 137                 bool result = buffer_.try_pop(packet);\r
 138                 graph_->update_value("buffer-count", MAX_BUFFER_SIZE/static_cast<double>(buffer_.size()));\r
 139                 if(result)\r
 140                 {\r
 141                         if(packet)\r
 142                                 buffer_size_ -= packet->size;\r
 143                         graph_->update_value("buffer-size", MAX_BUFFER_SIZE/static_cast<double>(buffer_size_));\r
 144                         cond_.notify_all();\r
 145                 }\r
 146                 return result;\r
 147         }\r
 148 \r
 149 private:\r
 150 \r
 151         void stop()\r
 152         {\r
 153                 executor_.stop();\r
 154                 \r
 155                 CASPAR_LOG(info) << print() << " Stopping.";\r
 156         }\r
 157 \r
 158         void read_file()\r
 159         {               \r
 160                 read_next_packet();\r
 161                 executor_.begin_invoke([this]{read_file();});\r
 162         }\r
 163                         \r
 164         void read_next_packet()\r
 165         {               \r
 166                 try\r
 167                 {\r
 168                         std::shared_ptr<AVPacket> read_packet(new AVPacket, [](AVPacket* p)\r
 169                         {\r
 170                                 av_free_packet(p);\r
 171                                 delete p;\r
 172                         });\r
 173                         av_init_packet(read_packet.get());\r
 174 \r
 175                         const int errn = av_read_frame(format_context_.get(), read_packet.get()); // read_packet is only valid until next call of av_read_frame.\r
 176                         if(is_eof(errn))                                                                                                                  // Use av_dup_packet to extend its life.\r
 177                         {\r
 178                                 if(loop_)\r
 179                                 {\r
 180                                         seek_frame(start_, AVSEEK_FLAG_BACKWARD);\r
 181                                         graph_->add_tag("seek");                \r
 182                                         //CASPAR_LOG(info) << print() << " Received EOF. Looping.";                     \r
 183                                 }       \r
 184                                 else\r
 185                                 {\r
 186                                         stop();\r
 187                                         //CASPAR_LOG(info) << print() << " Received EOF. Stopping.";\r
 188                                 }\r
 189                         }\r
 190                         else if(errn < 0)\r
 191                         {\r
 192                                 BOOST_THROW_EXCEPTION(\r
 193                                         file_read_error() <<\r
 194                                         msg_info(av_error_str(errn)) <<\r
 195                                         source_info(narrow(print())) << \r
 196                                         boost::errinfo_api_function("av_read_frame") <<\r
 197                                         boost::errinfo_errno(AVUNERROR(errn)));\r
 198                         }\r
 199                         else\r
 200                         {\r
 201                                 av_dup_packet(read_packet.get());\r
 202 \r
 203                                 graph_->update_value("buffer-count", MAX_BUFFER_SIZE/static_cast<double>(buffer_.size()));\r
 204                                 \r
 205                                 boost::unique_lock<boost::mutex> lock(mutex_);\r
 206                                 while(buffer_size_ > MAX_BUFFER_SIZE && buffer_.size() > MAX_BUFFER_COUNT)\r
 207                                         cond_.wait(lock);\r
 208                                 \r
 209                                 buffer_.push(read_packet);\r
 210                                 buffer_size_ += read_packet->size;\r
 211 \r
 212                                 graph_->update_value("buffer-size", MAX_BUFFER_SIZE/static_cast<double>(buffer_size_));\r
 213                         }                                                       \r
 214                 }\r
 215                 catch(...)\r
 216                 {\r
 217                         stop();\r
 218                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 219                         return;\r
 220                 }       \r
 221         }\r
 222 \r
 223         void seek_frame(int64_t frame, int flags = 0)\r
 224         {       \r
 225                 static const AVRational base_q = {1, AV_TIME_BASE};\r
 226 \r
 227                 // Convert from frames into seconds.\r
 228                 auto seek_target = frame;//*static_cast<int64_t>(AV_TIME_BASE/fps_);\r
 229 \r
 230                 int stream_index = -1;//video_stream_.index() >= 0 ? video_stream_.index() : audio_stream_.index();\r
 231 \r
 232                 //if(stream_index >= 0)         \r
 233                 //      seek_target = av_rescale_q(seek_target, base_q, format_context_->streams[stream_index]->time_base);\r
 234 \r
 235                 const int errn = av_seek_frame(format_context_.get(), stream_index, seek_target, flags);\r
 236                 if(errn < 0)\r
 237                 {       \r
 238                         BOOST_THROW_EXCEPTION(\r
 239                                 invalid_operation() << \r
 240                                 source_info(narrow(print())) << \r
 241                                 msg_info(av_error_str(errn)) <<\r
 242                                 boost::errinfo_api_function("av_seek_frame") <<\r
 243                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 244                 }\r
 245 \r
 246                 buffer_.push(nullptr);\r
 247         }               \r
 248 \r
 249         bool is_eof(int errn)\r
 250         {\r
 251                 //if(errn == AVERROR(EIO))\r
 252                 //      CASPAR_LOG(warning) << print() << " Received EIO, assuming EOF";\r
 253 \r
 254                 return errn == AVERROR_EOF || errn == AVERROR(EIO); // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 255         }\r
 256         \r
 257         std::wstring print() const\r
 258         {\r
 259                 return L"ffmpeg_input[" + filename_ + L")]";\r
 260         }\r
 261 };\r
 262 \r
 263 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start, int length) \r
 264         : impl_(new implementation(graph, filename, loop, start)){}\r
 265 bool input::eof() const {return !impl_->executor_.is_running();}\r
 266 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}\r
 267 std::shared_ptr<AVFormatContext> input::context(){return impl_->format_context_;}\r
 268 }