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/diagnostics/graph.h>\r
  33 \r
  34 #include <tbb/concurrent_queue.h>\r
  35 #include <tbb/atomic.h>\r
  36 \r
  37 #include <boost/range/algorithm.hpp>\r
  38 #include <boost/thread/condition_variable.hpp>\r
  39 #include <boost/thread/mutex.hpp>\r
  40 #include <boost/thread/thread.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         std::shared_ptr<AVFormatContext>                                                        format_context_; // Destroy this last\r
  58 \r
  59         safe_ptr<diagnostics::graph>                                                            graph_;\r
  60                 \r
  61         const std::wstring                                                                                      filename_;\r
  62         const bool                                                                                                      loop_;\r
  63         const int                                                                                                       start_;         \r
  64         \r
  65         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>        buffer_;\r
  66         tbb::atomic<size_t>                                                                                     buffer_size_;\r
  67         boost::condition_variable                                                                       buffer_cond_;\r
  68         boost::mutex                                                                                            buffer_mutex_;\r
  69                 \r
  70         boost::thread                                                                                           thread_;\r
  71         tbb::atomic<bool>                                                                                       is_running_;\r
  72 public:\r
  73         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start) \r
  74                 : graph_(graph)\r
  75                 , loop_(loop)\r
  76                 , filename_(filename)\r
  77                 , start_(std::max(start, 0))\r
  78         {                       \r
  79                 is_running_ = true;\r
  80 \r
  81                 int ret;\r
  82 \r
  83                 AVFormatContext* weak_format_context_ = nullptr;\r
  84                 ret = avformat_open_input(&weak_format_context_, narrow(filename).c_str(), nullptr, nullptr);\r
  85                 if(ret < 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(ret)) <<\r
  91                                 boost::errinfo_api_function("av_open_input_file") <<\r
  92                                 boost::errinfo_errno(AVUNERROR(ret)) <<\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                 ret = avformat_find_stream_info(format_context_.get(), nullptr);\r
  99                 if(ret < 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(ret)) <<\r
 105                                 boost::errinfo_api_function("av_find_stream_info") <<\r
 106                                 boost::errinfo_errno(AVUNERROR(ret)));\r
 107                 }\r
 108                 \r
 109                 if(start_ != 0)                 \r
 110                         seek_frame(start_);\r
 111                 \r
 112                 for(int n = 0; n < 16 && !full(); ++n)\r
 113                         read_next_packet();\r
 114                                                 \r
 115                 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));        \r
 116                 graph_->set_color("buffer-count", diagnostics::color(0.2f, 0.8f, 1.0f));\r
 117                 graph_->set_color("buffer-size", diagnostics::color(0.2f, 0.4f, 1.0f)); \r
 118 \r
 119                 thread_ = boost::thread([this]{run();});\r
 120         }\r
 121 \r
 122         ~implementation()\r
 123         {\r
 124                 is_running_ = false;\r
 125                 buffer_cond_.notify_all();\r
 126                 thread_.join();\r
 127         }\r
 128                 \r
 129         bool try_pop(std::shared_ptr<AVPacket>& packet)\r
 130         {\r
 131                 const bool result = buffer_.try_pop(packet);\r
 132 \r
 133                 if(result)\r
 134                 {\r
 135                         if(packet)\r
 136                                 buffer_size_ -= packet->size;\r
 137                         buffer_cond_.notify_all();\r
 138                 }\r
 139 \r
 140                 graph_->update_value("buffer-size", MAX_BUFFER_SIZE/static_cast<double>(buffer_size_));\r
 141                 graph_->update_value("buffer-count", MAX_BUFFER_SIZE/static_cast<double>(buffer_.size()));\r
 142 \r
 143                 return result;\r
 144         }\r
 145 \r
 146 private:\r
 147         \r
 148         void run()\r
 149         {               \r
 150                 caspar::win32_exception::install_handler();\r
 151 \r
 152                 try\r
 153                 {\r
 154                         CASPAR_LOG(info) << print() << " Thread Started.";\r
 155 \r
 156                         while(is_running_)\r
 157                         {\r
 158                                 {\r
 159                                         boost::unique_lock<boost::mutex> lock(buffer_mutex_);\r
 160                                         buffer_cond_.wait(lock, [this]{return !full();});\r
 161                                 }\r
 162                                 read_next_packet();                     \r
 163                         }\r
 164 \r
 165                         CASPAR_LOG(info) << print() << " Thread Stopped.";\r
 166                 }\r
 167                 catch(...)\r
 168                 {\r
 169                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 170                         is_running_ = false;\r
 171                 }\r
 172         }\r
 173                         \r
 174         void read_next_packet()\r
 175         {                       \r
 176                 std::shared_ptr<AVPacket> read_packet(new AVPacket, [](AVPacket* p)\r
 177                 {\r
 178                         av_free_packet(p);\r
 179                         delete p;\r
 180                 });\r
 181                 av_init_packet(read_packet.get());\r
 182 \r
 183                 const int ret = av_read_frame(format_context_.get(), read_packet.get()); // read_packet is only valid until next call of av_read_frame.\r
 184                 if(is_eof(ret))                                                                                                              // Use av_dup_packet to extend its life.\r
 185                 {\r
 186                         if(loop_)\r
 187                         {\r
 188                                 seek_frame(start_, AVSEEK_FLAG_BACKWARD);\r
 189                                 graph_->add_tag("seek");                \r
 190                                 CASPAR_LOG(trace) << print() << " Received EOF. Looping.";                      \r
 191                         }       \r
 192                         else\r
 193                         {\r
 194                                 is_running_ = false;\r
 195                                 CASPAR_LOG(trace) << print() << " Received EOF. Stopping.";\r
 196                         }\r
 197                 }\r
 198                 else if(ret < 0)\r
 199                 {\r
 200                         BOOST_THROW_EXCEPTION(\r
 201                                 file_read_error() <<\r
 202                                 msg_info(av_error_str(ret)) <<\r
 203                                 source_info(narrow(print())) << \r
 204                                 boost::errinfo_api_function("av_read_frame") <<\r
 205                                 boost::errinfo_errno(AVUNERROR(ret)));\r
 206                 }\r
 207                 else\r
 208                 {               \r
 209                         const int ret = av_dup_packet(read_packet.get());\r
 210                         if(ret < 0)\r
 211                         {\r
 212                                 BOOST_THROW_EXCEPTION(\r
 213                                         invalid_operation() <<\r
 214                                         msg_info(av_error_str(ret)) <<\r
 215                                         source_info(narrow(print())) << \r
 216                                         boost::errinfo_api_function("av_dup_packet") <<\r
 217                                         boost::errinfo_errno(AVUNERROR(ret)));\r
 218                         }\r
 219                                 \r
 220                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.\r
 221                         auto size = read_packet->size;\r
 222                         auto data = read_packet->data;\r
 223 \r
 224                         read_packet = std::shared_ptr<AVPacket>(read_packet.get(), [=](AVPacket*)\r
 225                         {\r
 226                                 read_packet->size = size;\r
 227                                 read_packet->data = data;\r
 228                         });\r
 229 \r
 230                         buffer_.try_push(read_packet);\r
 231                         buffer_size_ += read_packet->size;\r
 232                                 \r
 233                         graph_->update_value("buffer-count", MAX_BUFFER_SIZE/static_cast<double>(buffer_.size()));\r
 234                         graph_->update_value("buffer-size", MAX_BUFFER_SIZE/static_cast<double>(buffer_size_));\r
 235                 }                       \r
 236         }\r
 237 \r
 238         bool full() const\r
 239         {\r
 240                 return is_running_ && buffer_size_ > MAX_BUFFER_SIZE && buffer_.size() > MAX_BUFFER_COUNT;\r
 241         }\r
 242 \r
 243         void seek_frame(int64_t frame, int flags = 0)\r
 244         {       \r
 245                 static const AVRational base_q = {1, AV_TIME_BASE};\r
 246 \r
 247                 int stream_index = av_find_default_stream_index(format_context_.get());\r
 248                 \r
 249                 if(stream_index < 0)\r
 250                 {       \r
 251                         BOOST_THROW_EXCEPTION(\r
 252                                 invalid_operation() << \r
 253                                 source_info(narrow(print())) << \r
 254                                 msg_info(av_error_str(stream_index)) <<\r
 255                                 boost::errinfo_api_function("av_find_default_stream_index") <<\r
 256                                 boost::errinfo_errno(AVUNERROR(stream_index)));\r
 257                 }\r
 258                                                 \r
 259                 const int ret = av_seek_frame(format_context_.get(), stream_index, frame, flags);\r
 260                 if(ret < 0)\r
 261                 {       \r
 262                         BOOST_THROW_EXCEPTION(\r
 263                                 invalid_operation() << \r
 264                                 source_info(narrow(print())) << \r
 265                                 msg_info(av_error_str(ret)) <<\r
 266                                 boost::errinfo_api_function("av_seek_frame") <<\r
 267                                 boost::errinfo_errno(AVUNERROR(ret)));\r
 268                 }\r
 269 \r
 270                 buffer_.push(nullptr);\r
 271         }               \r
 272 \r
 273         bool is_eof(int ret)\r
 274         {\r
 275                 if(ret == AVERROR(EIO))\r
 276                         CASPAR_LOG(debug) << print() << " Received EIO, assuming EOF.";\r
 277                 //if(ret == AVERROR_EOF)\r
 278                 //      CASPAR_LOG(info) << print() << " Received EOF.";\r
 279 \r
 280                 return ret == AVERROR_EOF || ret == AVERROR(EIO); // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 281         }\r
 282         \r
 283         std::wstring print() const\r
 284         {\r
 285                 return L"ffmpeg_input[" + filename_ + L")]";\r
 286         }\r
 287 };\r
 288 \r
 289 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start, int length) \r
 290         : impl_(new implementation(graph, filename, loop, start)){}\r
 291 bool input::eof() const {return !impl_->is_running_;}\r
 292 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}\r
 293 std::shared_ptr<AVFormatContext> input::context(){return impl_->format_context_;}\r
 294 }