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/mutex.h>\r
  37 \r
  38 #include <boost/range/iterator_range.hpp>\r
  39 #include <boost/range/algorithm.hpp>\r
  40 \r
  41 extern "C" \r
  42 {\r
  43         #define __STDC_CONSTANT_MACROS\r
  44         #define __STDC_LIMIT_MACROS\r
  45         #include <libavformat/avformat.h>\r
  46 }\r
  47 \r
  48 namespace caspar {\r
  49         \r
  50 static const size_t PACKET_BUFFER_COUNT = 100; // Assume that av_read_frame distance between audio and video packets is less than PACKET_BUFFER_COUNT.\r
  51 \r
  52 class stream\r
  53 {\r
  54         std::shared_ptr<AVCodecContext> ctx_;\r
  55         int index_;\r
  56         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>> buffer_;\r
  57 \r
  58 public:\r
  59 \r
  60         stream() : index_(-1)\r
  61         {\r
  62                 buffer_.set_capacity(PACKET_BUFFER_COUNT);\r
  63         }\r
  64         \r
  65         int open(std::shared_ptr<AVFormatContext>& fctx, AVMediaType media_type)\r
  66         {               \r
  67                 const auto streams = boost::iterator_range<AVStream**>(fctx->streams, fctx->streams+fctx->nb_streams);\r
  68                 const auto it = boost::find_if(streams, [&](AVStream* stream) \r
  69                 {\r
  70                         return stream && stream->codec->codec_type == media_type;\r
  71                 });\r
  72                 \r
  73                 if(it == streams.end()) \r
  74                         return AVERROR_STREAM_NOT_FOUND;\r
  75                 \r
  76                 auto codec = avcodec_find_decoder((*it)->codec->codec_id);                      \r
  77                 if(!codec)\r
  78                         return AVERROR_DECODER_NOT_FOUND;\r
  79                         \r
  80                 index_ = (*it)->index;\r
  81 \r
  82                 int errn = tbb_avcodec_open((*it)->codec, codec);\r
  83                 if(errn < 0)\r
  84                         return errn;\r
  85                                 \r
  86                 ctx_.reset((*it)->codec, tbb_avcodec_close);\r
  87 \r
  88                 // Some files give an invalid time_base numerator, try to fix it.\r
  89                 if(ctx_ && ctx_->time_base.num == 1)\r
  90                         ctx_->time_base.num = static_cast<int>(std::pow(10.0, static_cast<int>(std::log10(static_cast<float>(ctx_->time_base.den)))-1));\r
  91                 \r
  92                 return errn;    \r
  93         }\r
  94 \r
  95         bool try_pop(std::shared_ptr<AVPacket>& pkt)\r
  96         {\r
  97                 return buffer_.try_pop(pkt);\r
  98         }\r
  99 \r
 100         void push(const std::shared_ptr<AVPacket>& pkt)\r
 101         {\r
 102                 if(pkt && pkt->stream_index != index_)\r
 103                         return;\r
 104 \r
 105                 if(pkt)\r
 106                         av_dup_packet(pkt.get());\r
 107 \r
 108                 buffer_.push(pkt);      \r
 109         }\r
 110 \r
 111         int index() const {return index_;}\r
 112         \r
 113         const std::shared_ptr<AVCodecContext>& ctx() { return ctx_; }\r
 114 \r
 115         operator bool(){return ctx_ != nullptr;}\r
 116 \r
 117         double fps() const { return !ctx_ ? -1.0 : static_cast<double>(ctx_->time_base.den) / static_cast<double>(ctx_->time_base.num); }\r
 118 \r
 119         bool empty() const { return buffer_.empty();}\r
 120         int size() const { return buffer_.size();}\r
 121 };\r
 122                 \r
 123 struct input::implementation : boost::noncopyable\r
 124 {               \r
 125         safe_ptr<diagnostics::graph> graph_;\r
 126 \r
 127         std::shared_ptr<AVFormatContext> format_context_;       // Destroy this last\r
 128                 \r
 129         const std::wstring      filename_;\r
 130         const bool                      loop_;\r
 131         const int                       start_;         \r
 132         double                          fps_;\r
 133 \r
 134         stream video_stream_;\r
 135         stream audio_stream_;\r
 136                 \r
 137         std::exception_ptr exception_;\r
 138         executor executor_;\r
 139 public:\r
 140         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start) \r
 141                 : graph_(graph)\r
 142                 , loop_(loop)\r
 143                 , filename_(filename)\r
 144                 , executor_(print())\r
 145                 , start_(std::max(start, 0))\r
 146         {               \r
 147                 graph_->set_color("audio-input-buffer", diagnostics::color(0.5f, 1.0f, 0.2f));\r
 148                 graph_->set_color("video-input-buffer", diagnostics::color(0.2f, 0.5f, 1.0f));\r
 149                 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));        \r
 150                 \r
 151                 int errn;\r
 152 \r
 153                 AVFormatContext* weak_format_context_ = nullptr;\r
 154                 errn = av_open_input_file(&weak_format_context_, narrow(filename).c_str(), nullptr, 0, nullptr);\r
 155                 if(errn < 0 || weak_format_context_ == nullptr)\r
 156                 {       \r
 157                         BOOST_THROW_EXCEPTION(\r
 158                                 file_read_error() << \r
 159                                 source_info(narrow(print())) << \r
 160                                 msg_info(av_error_str(errn)) <<\r
 161                                 boost::errinfo_api_function("av_open_input_file") <<\r
 162                                 boost::errinfo_errno(AVUNERROR(errn)) <<\r
 163                                 boost::errinfo_file_name(narrow(filename)));\r
 164                 }\r
 165 \r
 166                 format_context_.reset(weak_format_context_, av_close_input_file);\r
 167                         \r
 168                 errn = av_find_stream_info(format_context_.get());\r
 169                 if(errn < 0)\r
 170                 {       \r
 171                         BOOST_THROW_EXCEPTION(\r
 172                                 file_read_error() << \r
 173                                 source_info(narrow(print())) << \r
 174                                 msg_info(av_error_str(errn)) <<\r
 175                                 boost::errinfo_api_function("av_find_stream_info") <<\r
 176                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 177                 }\r
 178                 \r
 179                 errn = video_stream_.open(format_context_, AVMEDIA_TYPE_VIDEO);\r
 180                 if(errn < 0)\r
 181                         CASPAR_LOG(warning) << print() << L" Could not open video stream: " << widen(av_error_str(errn));\r
 182                 \r
 183                 errn = audio_stream_.open(format_context_, AVMEDIA_TYPE_AUDIO);\r
 184                 if(errn < 0)\r
 185                         CASPAR_LOG(warning) << print() << L" Could not open audio stream: " << widen(av_error_str(errn));\r
 186                 \r
 187                 if(!video_stream_ && !audio_stream_)\r
 188                 {       \r
 189                         BOOST_THROW_EXCEPTION(\r
 190                                 file_read_error() << \r
 191                                 source_info(narrow(print())) << \r
 192                                 msg_info("No video or audio codec context found."));    \r
 193                 }\r
 194 \r
 195                 fps_ = video_stream_ ? video_stream_.fps() : audio_stream_.fps();\r
 196 \r
 197                 if(start_ != 0)                 \r
 198                         seek_frame(start_);\r
 199 \r
 200                 for(size_t n = 0; n < 32; ++n) // Read some packets for pre-rolling.\r
 201                         read_next_packet();\r
 202                                                         \r
 203                 executor_.begin_invoke([this]{read_file();});\r
 204                 CASPAR_LOG(info) << print() << " Started.";\r
 205         }\r
 206 \r
 207         ~implementation()\r
 208         {\r
 209                 stop();\r
 210         }\r
 211                 \r
 212         bool try_pop_video_packet(std::shared_ptr<AVPacket>& packet)\r
 213         {\r
 214                 bool result = video_stream_.try_pop(packet);\r
 215                 if(result && !packet)\r
 216                         graph_->add_tag("video-input-buffer");\r
 217                 return result;\r
 218         }\r
 219 \r
 220         bool try_pop_audio_packet(std::shared_ptr<AVPacket>& packet)\r
 221         {       \r
 222                 bool result = audio_stream_.try_pop(packet);\r
 223                 if(result && !packet)\r
 224                         graph_->add_tag("audio-input-buffer");\r
 225                 return result;\r
 226         }\r
 227 \r
 228         double fps()\r
 229         {\r
 230                 return fps_;\r
 231         }\r
 232 \r
 233 private:\r
 234 \r
 235         void stop()\r
 236         {\r
 237                 executor_.stop();\r
 238 \r
 239                 // Unblock thread.\r
 240                 std::shared_ptr<AVPacket> packet;\r
 241                 try_pop_video_packet(packet);\r
 242                 try_pop_audio_packet(packet);\r
 243 \r
 244                 CASPAR_LOG(info) << print() << " Stopping.";\r
 245         }\r
 246 \r
 247         void read_file()\r
 248         {               \r
 249                 if(video_stream_.size() > 4 || audio_stream_.size() > 4) // audio is always before video.\r
 250                         Sleep(5); // There are enough packets, no hurry.\r
 251 \r
 252                 read_next_packet();\r
 253 \r
 254                 executor_.begin_invoke([this]{read_file();});\r
 255         }\r
 256                         \r
 257         void read_next_packet()\r
 258         {               \r
 259                 try\r
 260                 {\r
 261                         std::shared_ptr<AVPacket> read_packet(new AVPacket, [](AVPacket* p)\r
 262                         {\r
 263                                 av_free_packet(p);\r
 264                                 delete p;\r
 265                         });\r
 266                         av_init_packet(read_packet.get());\r
 267 \r
 268                         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
 269                         if(is_eof(errn))                                                                                                                  // Use av_dup_packet to extend its life.\r
 270                         {\r
 271                                 if(loop_)\r
 272                                 {\r
 273                                         seek_frame(start_, AVSEEK_FLAG_BACKWARD);\r
 274                                         graph_->add_tag("seek");                \r
 275                                         CASPAR_LOG(info) << print() << " Received EOF. Looping.";                       \r
 276                                 }       \r
 277                                 else\r
 278                                 {\r
 279                                         stop();\r
 280                                         CASPAR_LOG(info) << print() << " Received EOF. Stopping.";\r
 281                                 }\r
 282                         }\r
 283                         else if(errn < 0)\r
 284                         {\r
 285                                 BOOST_THROW_EXCEPTION(\r
 286                                         file_read_error() <<\r
 287                                         msg_info(av_error_str(errn)) <<\r
 288                                         source_info(narrow(print())) << \r
 289                                         boost::errinfo_api_function("av_read_frame") <<\r
 290                                         boost::errinfo_errno(AVUNERROR(errn)));\r
 291                         }\r
 292                         else\r
 293                         {\r
 294                                 video_stream_.push(read_packet);\r
 295                                 audio_stream_.push(read_packet);\r
 296                         }\r
 297                                                 \r
 298                         graph_->update_value("video-input-buffer", static_cast<float>(video_stream_.size())/static_cast<float>(PACKET_BUFFER_COUNT));           \r
 299                         graph_->update_value("audio-input-buffer", static_cast<float>(audio_stream_.size())/static_cast<float>(PACKET_BUFFER_COUNT));           \r
 300                 }\r
 301                 catch(...)\r
 302                 {\r
 303                         stop();\r
 304                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 305                         return;\r
 306                 }       \r
 307         }\r
 308 \r
 309         void seek_frame(int64_t frame, int flags = 0)\r
 310         {       \r
 311                 static const AVRational base_q = {1, AV_TIME_BASE};\r
 312 \r
 313                 // Convert from frames into seconds.\r
 314                 auto seek_target = frame*static_cast<int64_t>(AV_TIME_BASE/fps_);\r
 315 \r
 316                 int stream_index = video_stream_.index() >= 0 ? video_stream_.index() : audio_stream_.index();\r
 317 \r
 318                 if(stream_index >= 0)           \r
 319                         seek_target = av_rescale_q(seek_target, base_q, format_context_->streams[stream_index]->time_base);\r
 320 \r
 321                 const int errn = av_seek_frame(format_context_.get(), stream_index, seek_target, flags);\r
 322                 if(errn < 0)\r
 323                 {       \r
 324                         BOOST_THROW_EXCEPTION(\r
 325                                 invalid_operation() << \r
 326                                 source_info(narrow(print())) << \r
 327                                 msg_info(av_error_str(errn)) <<\r
 328                                 boost::errinfo_api_function("av_seek_frame") <<\r
 329                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 330                 }\r
 331 \r
 332                 video_stream_.push(nullptr);\r
 333                 audio_stream_.push(nullptr);\r
 334         }               \r
 335 \r
 336         bool is_eof(int errn)\r
 337         {\r
 338                 if(errn == AVERROR(EIO))\r
 339                         CASPAR_LOG(warning) << print() << " Received EIO, assuming EOF";\r
 340 \r
 341                 return errn == AVERROR_EOF || errn == AVERROR(EIO); // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 342         }\r
 343         \r
 344         std::wstring print() const\r
 345         {\r
 346                 return L"ffmpeg_input[" + filename_ + L"]";\r
 347         }\r
 348 };\r
 349 \r
 350 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start, int length) \r
 351         : impl_(new implementation(graph, filename, loop, start)){}\r
 352 const std::shared_ptr<AVCodecContext>& input::get_video_codec_context() const{return impl_->video_stream_.ctx();}\r
 353 const std::shared_ptr<AVCodecContext>& input::get_audio_codec_context() const{return impl_->audio_stream_.ctx();}\r
 354 bool input::is_running() const {return impl_->executor_.is_running();}\r
 355 bool input::try_pop_video_packet(std::shared_ptr<AVPacket>& packet){return impl_->try_pop_video_packet(packet);}\r
 356 bool input::try_pop_audio_packet(std::shared_ptr<AVPacket>& packet){return impl_->try_pop_audio_packet(packet);}\r
 357 double input::fps() const { return impl_->fps(); }\r
 358 }