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 #include <common/exception/exceptions.h>\r
  34 #include <common/exception/win32_exception.h>\r
  35 \r
  36 #include <tbb/concurrent_queue.h>\r
  37 #include <tbb/atomic.h>\r
  38 \r
  39 #include <boost/range/algorithm.hpp>\r
  40 #include <boost/thread/condition_variable.hpp>\r
  41 #include <boost/thread/mutex.hpp>\r
  42 #include <boost/thread/thread.hpp>\r
  43 \r
  44 #if defined(_MSC_VER)\r
  45 #pragma warning (push)\r
  46 #pragma warning (disable : 4244)\r
  47 #endif\r
  48 extern "C" \r
  49 {\r
  50         #define __STDC_CONSTANT_MACROS\r
  51         #define __STDC_LIMIT_MACROS\r
  52         #include <libavformat/avformat.h>\r
  53 }\r
  54 #if defined(_MSC_VER)\r
  55 #pragma warning (pop)\r
  56 #endif\r
  57 \r
  58 namespace caspar {\r
  59 \r
  60 static const size_t MAX_BUFFER_COUNT = 128;\r
  61 static const size_t MAX_BUFFER_SIZE  = 32 * 1000000;\r
  62         \r
  63 struct input::implementation : boost::noncopyable\r
  64 {               \r
  65         std::shared_ptr<AVFormatContext>                                                        format_context_; // Destroy this last\r
  66 \r
  67         safe_ptr<diagnostics::graph>                                                            graph_;\r
  68                 \r
  69         const std::wstring                                                                                      filename_;\r
  70         const bool                                                                                                      loop_;\r
  71         const int                                                                                                       start_;         \r
  72         \r
  73         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>        buffer_;\r
  74         tbb::atomic<size_t>                                                                                     buffer_size_;\r
  75         boost::condition_variable                                                                       buffer_cond_;\r
  76         boost::mutex                                                                                            buffer_mutex_;\r
  77                 \r
  78         boost::thread                                                                                           thread_;\r
  79         tbb::atomic<bool>                                                                                       is_running_;\r
  80 public:\r
  81         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start) \r
  82                 : graph_(graph)\r
  83                 , loop_(loop)\r
  84                 , filename_(filename)\r
  85                 , start_(std::max(start, 0))\r
  86         {                       \r
  87                 is_running_ = true;\r
  88                 \r
  89                 AVFormatContext* weak_format_context_ = nullptr;\r
  90                 THROW_ON_ERROR2(avformat_open_input(&weak_format_context_, narrow(filename).c_str(), nullptr, nullptr), print());\r
  91 \r
  92                 format_context_.reset(weak_format_context_, av_close_input_file);\r
  93                         \r
  94                 THROW_ON_ERROR2(avformat_find_stream_info(format_context_.get(), nullptr), print());\r
  95                 \r
  96                 if(start_ != 0)                 \r
  97                         seek_frame(start_);\r
  98                 \r
  99                 for(int n = 0; n < 16 && !full(); ++n)\r
 100                         read_next_packet();\r
 101                                                 \r
 102                 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));        \r
 103                 graph_->set_color("buffer-count", diagnostics::color(0.2f, 0.8f, 1.0f));\r
 104                 graph_->set_color("buffer-size", diagnostics::color(0.2f, 0.4f, 1.0f)); \r
 105 \r
 106                 thread_ = boost::thread([this]{run();});\r
 107         }\r
 108 \r
 109         ~implementation()\r
 110         {\r
 111                 is_running_ = false;\r
 112                 buffer_cond_.notify_all();\r
 113                 thread_.join();\r
 114         }\r
 115                 \r
 116         bool try_pop(std::shared_ptr<AVPacket>& packet)\r
 117         {\r
 118                 const bool result = buffer_.try_pop(packet);\r
 119 \r
 120                 if(result)\r
 121                 {\r
 122                         if(packet)\r
 123                                 buffer_size_ -= packet->size;\r
 124                         buffer_cond_.notify_all();\r
 125                 }\r
 126 \r
 127                 graph_->update_value("buffer-size", MAX_BUFFER_SIZE/static_cast<double>(buffer_size_));\r
 128                 graph_->update_value("buffer-count", MAX_BUFFER_SIZE/static_cast<double>(buffer_.size()));\r
 129 \r
 130                 return result;\r
 131         }\r
 132 \r
 133 private:\r
 134         \r
 135         void run()\r
 136         {               \r
 137                 caspar::win32_exception::install_handler();\r
 138 \r
 139                 try\r
 140                 {\r
 141                         CASPAR_LOG(info) << print() << " Thread Started.";\r
 142 \r
 143                         while(is_running_)\r
 144                         {\r
 145                                 {\r
 146                                         boost::unique_lock<boost::mutex> lock(buffer_mutex_);\r
 147                                         buffer_cond_.wait(lock, [this]{return !full();});\r
 148                                 }\r
 149                                 read_next_packet();                     \r
 150                         }\r
 151 \r
 152                         CASPAR_LOG(info) << print() << " Thread Stopped.";\r
 153                 }\r
 154                 catch(...)\r
 155                 {\r
 156                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 157                         is_running_ = false;\r
 158                 }\r
 159         }\r
 160                         \r
 161         void read_next_packet()\r
 162         {               \r
 163                 int ret = 0;\r
 164 \r
 165                 std::shared_ptr<AVPacket> read_packet(new AVPacket, [](AVPacket* p)\r
 166                 {\r
 167                         av_free_packet(p);\r
 168                         delete p;\r
 169                 });\r
 170                 av_init_packet(read_packet.get());\r
 171 \r
 172                 ret = av_read_frame(format_context_.get(), read_packet.get()); // read_packet is only valid until next call of av_read_frame. Use av_dup_packet to extend its life.     \r
 173                 \r
 174                 if(is_eof(ret))                                                                                                              \r
 175                 {\r
 176                         if(loop_)\r
 177                         {\r
 178                                 seek_frame(start_, AVSEEK_FLAG_BACKWARD);\r
 179                                 graph_->add_tag("seek");                \r
 180                                 CASPAR_LOG(trace) << print() << " Received EOF. Looping.";                      \r
 181                         }       \r
 182                         else\r
 183                         {\r
 184                                 is_running_ = false;\r
 185                                 CASPAR_LOG(trace) << print() << " Received EOF. Stopping.";\r
 186                         }\r
 187                 }\r
 188                 else\r
 189                 {               \r
 190                         THROW_ON_ERROR(ret, print(), "av_read_frame");\r
 191 \r
 192                         THROW_ON_ERROR2(av_dup_packet(read_packet.get()), print());\r
 193                                 \r
 194                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.\r
 195                         auto size = read_packet->size;\r
 196                         auto data = read_packet->data;\r
 197 \r
 198                         read_packet = std::shared_ptr<AVPacket>(read_packet.get(), [=](AVPacket*)\r
 199                         {\r
 200                                 read_packet->size = size;\r
 201                                 read_packet->data = data;\r
 202                         });\r
 203 \r
 204                         buffer_.try_push(read_packet);\r
 205                         buffer_size_ += read_packet->size;\r
 206                                 \r
 207                         graph_->update_value("buffer-count", MAX_BUFFER_SIZE/static_cast<double>(buffer_.size()));\r
 208                         graph_->update_value("buffer-size", MAX_BUFFER_SIZE/static_cast<double>(buffer_size_));\r
 209                 }                       \r
 210         }\r
 211 \r
 212         bool full() const\r
 213         {\r
 214                 return is_running_ && buffer_size_ > MAX_BUFFER_SIZE && buffer_.size() > MAX_BUFFER_COUNT;\r
 215         }\r
 216 \r
 217         void seek_frame(int64_t frame, int flags = 0)\r
 218         {       \r
 219                 static const AVRational base_q = {1, AV_TIME_BASE};\r
 220 \r
 221                 int stream_index = av_find_default_stream_index(format_context_.get());\r
 222                 THROW_ON_ERROR(stream_index, print(), "av_find_default_stream_index");\r
 223                                                 \r
 224                 const int ret = av_seek_frame(format_context_.get(), stream_index, frame, flags);\r
 225                 THROW_ON_ERROR(ret, print(), "av_seek_frame");\r
 226                 \r
 227                 buffer_.push(nullptr);\r
 228         }               \r
 229 \r
 230         bool is_eof(int ret)\r
 231         {\r
 232                 if(ret == AVERROR(EIO))\r
 233                         CASPAR_LOG(debug) << print() << " Received EIO, assuming EOF.";\r
 234                 //if(ret == AVERROR_EOF)\r
 235                 //      CASPAR_LOG(info) << print() << " Received EOF.";\r
 236 \r
 237                 return ret == AVERROR_EOF || ret == AVERROR(EIO); // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 238         }\r
 239         \r
 240         std::wstring print() const\r
 241         {\r
 242                 return L"ffmpeg_input[" + filename_ + L")]";\r
 243         }\r
 244 };\r
 245 \r
 246 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start, int length) \r
 247         : impl_(new implementation(graph, filename, loop, start)){}\r
 248 bool input::eof() const {return !impl_->is_running_;}\r
 249 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}\r
 250 std::shared_ptr<AVFormatContext> input::context(){return impl_->format_context_;}\r
 251 }