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  = 64 * 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                 buffer_.set_capacity(MAX_BUFFER_COUNT);\r
  84 \r
  85                 AVFormatContext* weak_format_context_ = nullptr;\r
  86                 errn = av_open_input_file(&weak_format_context_, narrow(filename).c_str(), nullptr, 0, nullptr);\r
  87                 if(errn < 0 || weak_format_context_ == nullptr)\r
  88                 {       \r
  89                         BOOST_THROW_EXCEPTION(\r
  90                                 file_read_error() << \r
  91                                 source_info(narrow(print())) << \r
  92                                 msg_info(av_error_str(errn)) <<\r
  93                                 boost::errinfo_api_function("av_open_input_file") <<\r
  94                                 boost::errinfo_errno(AVUNERROR(errn)) <<\r
  95                                 boost::errinfo_file_name(narrow(filename)));\r
  96                 }\r
  97 \r
  98                 format_context_.reset(weak_format_context_, av_close_input_file);\r
  99                         \r
 100                 errn = av_find_stream_info(format_context_.get());\r
 101                 if(errn < 0)\r
 102                 {       \r
 103                         BOOST_THROW_EXCEPTION(\r
 104                                 file_read_error() << \r
 105                                 source_info(narrow(print())) << \r
 106                                 msg_info(av_error_str(errn)) <<\r
 107                                 boost::errinfo_api_function("av_find_stream_info") <<\r
 108                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 109                 }\r
 110                 \r
 111                 if(start_ != 0)                 \r
 112                         seek_frame(start_);\r
 113                                 \r
 114                 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));        \r
 115                 graph_->set_color("buffer-count", diagnostics::color(0.2f, 0.8f, 1.0f));\r
 116                 graph_->set_color("buffer-size", diagnostics::color(0.2f, 0.4f, 1.0f)); \r
 117 \r
 118                 executor_.begin_invoke([this]{read_file();});\r
 119                 CASPAR_LOG(info) << print() << " Started.";\r
 120         }\r
 121 \r
 122         ~implementation()\r
 123         {\r
 124                 stop();\r
 125                 // Unblock thread.\r
 126                 std::shared_ptr<AVPacket> packet;\r
 127                 buffer_.try_pop(packet);\r
 128                 buffer_size_ = 0;\r
 129                 cond_.notify_all();\r
 130         }\r
 131                 \r
 132         bool try_pop(std::shared_ptr<AVPacket>& packet)\r
 133         {\r
 134                 bool result = buffer_.try_pop(packet);\r
 135                 graph_->update_value("buffer-count", MAX_BUFFER_SIZE/static_cast<double>(buffer_.size()));\r
 136                 if(packet)\r
 137                 {\r
 138                         buffer_size_ -= packet->size;\r
 139                         graph_->update_value("buffer-size", MAX_BUFFER_SIZE/static_cast<double>(buffer_size_));\r
 140                         cond_.notify_all();\r
 141                 }\r
 142                 return result;\r
 143         }\r
 144                 \r
 145         AVStream* stream(AVMediaType media_type)\r
 146         {\r
 147                 const auto streams = boost::iterator_range<AVStream**>(format_context_->streams, format_context_->streams + format_context_->nb_streams);\r
 148                 const auto it = boost::find_if(streams, [&](AVStream* stream) \r
 149                 {\r
 150                         return stream && stream->codec->codec_type == media_type;\r
 151                 });\r
 152                 \r
 153                 if(it == streams.end()) \r
 154                         return nullptr;\r
 155 \r
 156                 return *it;\r
 157         }\r
 158 \r
 159 private:\r
 160 \r
 161         void stop()\r
 162         {\r
 163                 executor_.stop();\r
 164                 \r
 165                 CASPAR_LOG(info) << print() << " Stopping.";\r
 166         }\r
 167 \r
 168         void read_file()\r
 169         {               \r
 170                 read_next_packet();\r
 171                 executor_.begin_invoke([this]{read_file();});\r
 172         }\r
 173                         \r
 174         void read_next_packet()\r
 175         {               \r
 176                 try\r
 177                 {\r
 178                         std::shared_ptr<AVPacket> read_packet(new AVPacket, [](AVPacket* p)\r
 179                         {\r
 180                                 av_free_packet(p);\r
 181                                 delete p;\r
 182                         });\r
 183                         av_init_packet(read_packet.get());\r
 184 \r
 185                         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
 186                         if(is_eof(errn))                                                                                                                  // Use av_dup_packet to extend its life.\r
 187                         {\r
 188                                 if(loop_)\r
 189                                 {\r
 190                                         seek_frame(start_, AVSEEK_FLAG_BACKWARD);\r
 191                                         graph_->add_tag("seek");                \r
 192                                         //CASPAR_LOG(info) << print() << " Received EOF. Looping.";                     \r
 193                                 }       \r
 194                                 else\r
 195                                 {\r
 196                                         stop();\r
 197                                         //CASPAR_LOG(info) << print() << " Received EOF. Stopping.";\r
 198                                 }\r
 199                         }\r
 200                         else if(errn < 0)\r
 201                         {\r
 202                                 BOOST_THROW_EXCEPTION(\r
 203                                         file_read_error() <<\r
 204                                         msg_info(av_error_str(errn)) <<\r
 205                                         source_info(narrow(print())) << \r
 206                                         boost::errinfo_api_function("av_read_frame") <<\r
 207                                         boost::errinfo_errno(AVUNERROR(errn)));\r
 208                         }\r
 209                         else\r
 210                         {\r
 211                                 av_dup_packet(read_packet.get());\r
 212                                 buffer_.push(read_packet);\r
 213 \r
 214                                 graph_->update_value("buffer-count", MAX_BUFFER_SIZE/static_cast<double>(buffer_.size()));\r
 215                                 \r
 216                                 boost::unique_lock<boost::mutex> lock(mutex_);\r
 217                                 while(buffer_size_ > MAX_BUFFER_SIZE && buffer_.size() > 2)\r
 218                                         cond_.wait(lock);\r
 219 \r
 220                                 buffer_size_ += read_packet->size;\r
 221 \r
 222                                 graph_->update_value("buffer-size", MAX_BUFFER_SIZE/static_cast<double>(buffer_size_));\r
 223                         }                                                       \r
 224                 }\r
 225                 catch(...)\r
 226                 {\r
 227                         stop();\r
 228                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 229                         return;\r
 230                 }       \r
 231         }\r
 232 \r
 233         void seek_frame(int64_t frame, int flags = 0)\r
 234         {       \r
 235                 static const AVRational base_q = {1, AV_TIME_BASE};\r
 236 \r
 237                 // Convert from frames into seconds.\r
 238                 auto seek_target = frame;//*static_cast<int64_t>(AV_TIME_BASE/fps_);\r
 239 \r
 240                 int stream_index = -1;//video_stream_.index() >= 0 ? video_stream_.index() : audio_stream_.index();\r
 241 \r
 242                 //if(stream_index >= 0)         \r
 243                 //      seek_target = av_rescale_q(seek_target, base_q, format_context_->streams[stream_index]->time_base);\r
 244 \r
 245                 const int errn = av_seek_frame(format_context_.get(), stream_index, seek_target, flags);\r
 246                 if(errn < 0)\r
 247                 {       \r
 248                         BOOST_THROW_EXCEPTION(\r
 249                                 invalid_operation() << \r
 250                                 source_info(narrow(print())) << \r
 251                                 msg_info(av_error_str(errn)) <<\r
 252                                 boost::errinfo_api_function("av_seek_frame") <<\r
 253                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 254                 }\r
 255 \r
 256                 buffer_.push(nullptr);\r
 257         }               \r
 258 \r
 259         bool is_eof(int errn)\r
 260         {\r
 261                 //if(errn == AVERROR(EIO))\r
 262                 //      CASPAR_LOG(warning) << print() << " Received EIO, assuming EOF";\r
 263 \r
 264                 return errn == AVERROR_EOF || errn == AVERROR(EIO); // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 265         }\r
 266         \r
 267         std::wstring print() const\r
 268         {\r
 269                 return L"ffmpeg_input[" + filename_ + L")]";\r
 270         }\r
 271 };\r
 272 \r
 273 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start, int length) \r
 274         : impl_(new implementation(graph, filename, loop, start)){}\r
 275 AVStream* input::stream(AVMediaType media_type){return impl_->stream(media_type);}\r
 276 bool input::eof() const {return !impl_->executor_.is_running();}\r
 277 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}\r
 278 }