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 \r
  29 #include <core/video_format.h>\r
  30 \r
  31 #include <common/concurrency/executor.h>\r
  32 #include <common/diagnostics/graph.h>\r
  33 \r
  34 #include <tbb/concurrent_queue.h>\r
  35 #include <tbb/mutex.h>\r
  36 \r
  37 #include <boost/range/iterator_range.hpp>\r
  38 #include <boost/range/algorithm.hpp>\r
  39 \r
  40 extern "C" \r
  41 {\r
  42         #define __STDC_CONSTANT_MACROS\r
  43         #define __STDC_LIMIT_MACROS\r
  44         #include <libavformat/avformat.h>\r
  45 }\r
  46 \r
  47 namespace caspar {\r
  48                 \r
  49 struct input::implementation : boost::noncopyable\r
  50 {               \r
  51         static const size_t PACKET_BUFFER_COUNT = 50;\r
  52 \r
  53         safe_ptr<diagnostics::graph> graph_;\r
  54 \r
  55         std::shared_ptr<AVFormatContext> format_context_;       // Destroy this last\r
  56 \r
  57         std::shared_ptr<AVCodecContext> video_codec_context_;\r
  58         std::shared_ptr<AVCodecContext> audio_codex_context_;\r
  59         \r
  60         const std::wstring      filename_;\r
  61         const bool                      loop_;\r
  62         int                                     video_s_index_;\r
  63         int                                     audio_s_index_;\r
  64         const int                       start_;\r
  65         const int                       length_;\r
  66         int                                     eof_count_;\r
  67                 \r
  68         tbb::concurrent_bounded_queue<packet> video_packet_buffer_;\r
  69         tbb::concurrent_bounded_queue<packet> audio_packet_buffer_;\r
  70 \r
  71         boost::condition_variable       cond_;\r
  72         boost::mutex                            mutex_;\r
  73         \r
  74         std::exception_ptr exception_;\r
  75         executor executor_;\r
  76 public:\r
  77         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start, int length) \r
  78                 : graph_(graph)\r
  79                 , loop_(loop)\r
  80                 , video_s_index_(-1)\r
  81                 , audio_s_index_(-1)\r
  82                 , filename_(filename)\r
  83                 , executor_(print())\r
  84                 , start_(std::max(start, 0))\r
  85                 , length_(length)\r
  86                 , eof_count_(length)\r
  87         {                       \r
  88                 graph_->set_color("input-buffer", diagnostics::color(1.0f, 1.0f, 0.0f));\r
  89                 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));        \r
  90 \r
  91                 int errn;\r
  92                 AVFormatContext* weak_format_context_ = nullptr;\r
  93                 if((errn = av_open_input_file(&weak_format_context_, narrow(filename).c_str(), nullptr, 0, nullptr)) < 0 || weak_format_context_ == nullptr)\r
  94                         BOOST_THROW_EXCEPTION(\r
  95                                 file_read_error() << \r
  96                                 source_info(narrow(print())) << \r
  97                                 msg_info(av_error_str(errn)) <<\r
  98                                 boost::errinfo_api_function("av_open_input_file") <<\r
  99                                 boost::errinfo_errno(AVUNERROR(errn)) <<\r
 100                                 boost::errinfo_file_name(narrow(filename)));\r
 101 \r
 102                 format_context_.reset(weak_format_context_, av_close_input_file);\r
 103                         \r
 104                 if((errn = av_find_stream_info(format_context_.get())) < 0)\r
 105                 {       \r
 106                         BOOST_THROW_EXCEPTION(\r
 107                                 file_read_error() << \r
 108                                 source_info(narrow(print())) << \r
 109                                 msg_info(av_error_str(errn)) <<\r
 110                                 boost::errinfo_api_function("av_find_stream_info") <<\r
 111                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 112                 }\r
 113 \r
 114                 video_codec_context_ = open_stream(AVMEDIA_TYPE_VIDEO, video_s_index_);\r
 115                 if(!video_codec_context_)\r
 116                         CASPAR_LOG(warning) << print() << " Could not open any video stream.";\r
 117                 else\r
 118                         fix_time_base(video_codec_context_.get());\r
 119                 \r
 120                 audio_codex_context_ = open_stream(AVMEDIA_TYPE_AUDIO, audio_s_index_);\r
 121                 if(!audio_codex_context_)\r
 122                         CASPAR_LOG(warning) << print() << " Could not open any audio stream.";\r
 123                 else\r
 124                         fix_time_base(audio_codex_context_.get());\r
 125 \r
 126                 if(!video_codec_context_ && !audio_codex_context_)\r
 127                 {       \r
 128                         BOOST_THROW_EXCEPTION(\r
 129                                 file_read_error() << \r
 130                                 msg_info(av_error_str(errn)) <<\r
 131                                 source_info(narrow(print())) << \r
 132                                 msg_info("No video or audio codec context found."));    \r
 133                 }\r
 134 \r
 135                 if(start_ != 0)                 \r
 136                         seek_frame(start_);\r
 137                                         \r
 138                 executor_.start();\r
 139                 executor_.begin_invoke([this]{read_file();});\r
 140                 CASPAR_LOG(info) << print() << " Started.";\r
 141         }\r
 142 \r
 143         ~implementation()\r
 144         {\r
 145                 executor_.clear();\r
 146                 executor_.stop();\r
 147                 cond_.notify_all();\r
 148         }\r
 149                 \r
 150         packet get_video_packet()\r
 151         {\r
 152                 return get_packet(video_packet_buffer_);\r
 153         }\r
 154 \r
 155         packet get_audio_packet()\r
 156         {\r
 157                 return get_packet(audio_packet_buffer_);\r
 158         }\r
 159 \r
 160         bool has_packet() const\r
 161         {\r
 162                 return !video_packet_buffer_.empty() || !audio_packet_buffer_.empty();\r
 163         }\r
 164                                 \r
 165         double fps()\r
 166         {\r
 167                 return static_cast<double>(get_default_context()->time_base.den) / static_cast<double>(get_default_context()->time_base.num);\r
 168         }\r
 169 \r
 170 private:\r
 171 \r
 172         void stop()\r
 173         {\r
 174                 executor_.stop();\r
 175                 CASPAR_LOG(info) << print() << " Stopped.";\r
 176         }\r
 177                         \r
 178         void fix_time_base(AVCodecContext* context) const // Some files give an invalid numerator, try to fix it.\r
 179         {\r
 180                 if(context && context->time_base.num == 1)\r
 181                         context->time_base.num = static_cast<int>(std::pow(10.0, static_cast<int>(std::log10(static_cast<float>(context->time_base.den)))-1));\r
 182         }\r
 183 \r
 184         std::shared_ptr<AVCodecContext> open_stream(int codec_type, int& s_index) const\r
 185         {               \r
 186                 const auto streams = boost::iterator_range<AVStream**>(format_context_->streams, format_context_->streams+format_context_->nb_streams);\r
 187                 const auto stream = boost::find_if(streams, [&](AVStream* stream) \r
 188                 {\r
 189                         return stream != nullptr && stream->codec->codec_type == codec_type;\r
 190                 });\r
 191                 \r
 192                 if(stream == streams.end()) \r
 193                         return nullptr;\r
 194                 \r
 195                 auto codec = avcodec_find_decoder((*stream)->codec->codec_id);                  \r
 196                 if(codec == nullptr)\r
 197                         return nullptr;\r
 198                         \r
 199                 if(avcodec_open((*stream)->codec, codec) < 0)           \r
 200                         return nullptr;\r
 201                 \r
 202                 s_index = (*stream)->index;\r
 203 \r
 204                 return std::shared_ptr<AVCodecContext>((*stream)->codec, avcodec_close);\r
 205         }\r
 206         \r
 207         std::shared_ptr<AVCodecContext>& get_default_context()\r
 208         {\r
 209                 return video_codec_context_ ? video_codec_context_ : audio_codex_context_;\r
 210         }\r
 211                 \r
 212         void read_file()\r
 213         {               \r
 214                 if(audio_packet_buffer_.size() > 4 && video_packet_buffer_.size() > 4)\r
 215                         boost::this_thread::yield(); // There is enough packets, no hurry.\r
 216 \r
 217                 try\r
 218                 {\r
 219                         std::shared_ptr<AVPacket> read_packet(new AVPacket(), [](AVPacket* p)\r
 220                         {\r
 221                                 av_free_packet(p);\r
 222                                 delete p;\r
 223                         });\r
 224 \r
 225                         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
 226                         if(is_eof(errn))                                                                                                                  // Use av_dup_packet to extend its life.\r
 227                         {\r
 228                                 if(loop_)\r
 229                                 {\r
 230                                         seek_frame(start_, AVSEEK_FLAG_BACKWARD);\r
 231                                         // AVCodecContext.frame_number is not reset. Increase the target frame_number.\r
 232                                         eof_count_ += length_; \r
 233                                         graph_->add_tag("seek");        \r
 234                                 }       \r
 235                                 else\r
 236                                         stop();\r
 237                         }\r
 238                         else if(errn < 0)\r
 239                         {\r
 240                                 BOOST_THROW_EXCEPTION(\r
 241                                         invalid_operation() <<\r
 242                                         msg_info(av_error_str(errn)) <<\r
 243                                         source_info(narrow(print())) << \r
 244                                         boost::errinfo_api_function("av_read_frame") <<\r
 245                                         boost::errinfo_errno(AVUNERROR(errn)));\r
 246                         }\r
 247                         else\r
 248                         {\r
 249                                 if(read_packet->stream_index == video_s_index_)                 \r
 250                                 {                                       \r
 251                                         av_dup_packet(read_packet.get());\r
 252                                         video_packet_buffer_.try_push(packet(read_packet));     \r
 253                                 }\r
 254                                 else if(read_packet->stream_index)      \r
 255                                 {                                       \r
 256                                         av_dup_packet(read_packet.get());\r
 257                                         audio_packet_buffer_.try_push(packet(read_packet));     \r
 258                                 }\r
 259                         }\r
 260                                                 \r
 261                         graph_->update_value("input-buffer", static_cast<float>(video_packet_buffer_.size())/static_cast<float>(PACKET_BUFFER_COUNT));          \r
 262                 }\r
 263                 catch(...)\r
 264                 {\r
 265                         stop();\r
 266                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 267                         return;\r
 268                 }\r
 269                                 \r
 270                 executor_.begin_invoke([this]{read_file();});           \r
 271                 boost::unique_lock<boost::mutex> lock(mutex_);\r
 272                 while(executor_.is_running() && audio_packet_buffer_.size() > PACKET_BUFFER_COUNT && video_packet_buffer_.size() > PACKET_BUFFER_COUNT)\r
 273                         cond_.wait(lock);               \r
 274         }\r
 275 \r
 276         void seek_frame(int64_t frame, int flags = 0)\r
 277         {       \r
 278                 // Convert from frames into seconds.\r
 279                 const auto ts = frame*static_cast<int64_t>((AV_TIME_BASE*get_default_context()->time_base.num) / get_default_context()->time_base.den);\r
 280 \r
 281                 const int errn = av_seek_frame(format_context_.get(), -1, ts, flags | AVSEEK_FLAG_FRAME);\r
 282 \r
 283                 if(errn < 0)\r
 284                 {       \r
 285                         BOOST_THROW_EXCEPTION(\r
 286                                 invalid_operation() << \r
 287                                 source_info(narrow(print())) << \r
 288                                 msg_info(av_error_str(errn)) <<\r
 289                                 boost::errinfo_api_function("seek_frame") <<\r
 290                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 291                 }\r
 292 \r
 293                 // Notify decoders to flush buffers.\r
 294                 video_packet_buffer_.try_push(flush_packet);    \r
 295                 audio_packet_buffer_.try_push(flush_packet);\r
 296         }               \r
 297 \r
 298         bool is_eof(int errn)\r
 299         {\r
 300                 if(length_ != -1)\r
 301                         return get_default_context()->frame_number > eof_count_;                \r
 302 \r
 303                 return errn == AVERROR_EOF;\r
 304         }\r
 305                 \r
 306         packet get_packet(tbb::concurrent_bounded_queue<packet>& buffer)\r
 307         {\r
 308                 packet packet;\r
 309                 if(buffer.try_pop(packet))\r
 310                         cond_.notify_all();\r
 311                 return packet;\r
 312         }\r
 313 \r
 314         std::wstring print() const\r
 315         {\r
 316                 return L"ffmpeg_input[" + filename_ + L"]";\r
 317         }\r
 318 };\r
 319 \r
 320 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start, int length) \r
 321         : impl_(new implementation(graph, filename, loop, start, length)){}\r
 322 const std::shared_ptr<AVCodecContext>& input::get_video_codec_context() const{return impl_->video_codec_context_;}\r
 323 const std::shared_ptr<AVCodecContext>& input::get_audio_codec_context() const{return impl_->audio_codex_context_;}\r
 324 bool input::has_packet() const{return impl_->has_packet();}\r
 325 bool input::is_running() const {return impl_->executor_.is_running();}\r
 326 packet input::get_video_packet(){return impl_->get_video_packet();}\r
 327 packet input::get_audio_packet(){return impl_->get_audio_packet();}\r
 328 double input::fps() const { return impl_->fps(); }\r
 329 }