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()\r
  61                 : index_(-1)\r
  62         {\r
  63                 buffer_.set_capacity(PACKET_BUFFER_COUNT);\r
  64         }\r
  65 \r
  66         int open(std::shared_ptr<AVFormatContext>& fctx, AVMediaType media_type)\r
  67         {               \r
  68                 const auto streams = boost::iterator_range<AVStream**>(fctx->streams, fctx->streams+fctx->nb_streams);\r
  69                 const auto stream = boost::find_if(streams, [&](AVStream* stream) \r
  70                 {\r
  71                         return stream && stream->codec->codec_type == media_type;\r
  72                 });\r
  73                 \r
  74                 if(stream == streams.end()) \r
  75                         return AVERROR_STREAM_NOT_FOUND;\r
  76                 \r
  77                 auto codec = avcodec_find_decoder((*stream)->codec->codec_id);                  \r
  78                 if(!codec)\r
  79                         return AVERROR_DECODER_NOT_FOUND;\r
  80                         \r
  81                 index_ = (*stream)->index;\r
  82 \r
  83                 int errn = tbb_avcodec_open((*stream)->codec, codec);\r
  84                 if(errn >= 0)\r
  85                 {\r
  86                         ctx_.reset((*stream)->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->stream_index != index_)\r
 103                         return;\r
 104 \r
 105                 av_dup_packet(pkt.get());\r
 106                 buffer_.push(pkt);      \r
 107         }\r
 108 \r
 109         const std::shared_ptr<AVCodecContext>& ctx() { return ctx_; }\r
 110 \r
 111         operator bool(){return ctx_ != nullptr;}\r
 112 \r
 113         double fps() const { return !ctx_ ? -1.0 : static_cast<double>(ctx_->time_base.den) / static_cast<double>(ctx_->time_base.num); }\r
 114 \r
 115         bool empty() const { return buffer_.empty();}\r
 116         int size() const { return buffer_.size();}\r
 117 };\r
 118                 \r
 119 struct input::implementation : boost::noncopyable\r
 120 {               \r
 121         safe_ptr<diagnostics::graph> graph_;\r
 122 \r
 123         std::shared_ptr<AVFormatContext> format_context_;       // Destroy this last\r
 124                 \r
 125         const std::wstring      filename_;\r
 126         const bool                      loop_;\r
 127         const int                       start_;         \r
 128         double                          fps_;\r
 129 \r
 130         stream video_stream_;\r
 131         stream audio_stream_;\r
 132                 \r
 133         std::exception_ptr exception_;\r
 134         executor executor_;\r
 135 public:\r
 136         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start) \r
 137                 : graph_(graph)\r
 138                 , loop_(loop)\r
 139                 , filename_(filename)\r
 140                 , executor_(print())\r
 141                 , start_(std::max(start, 0))\r
 142         {               \r
 143                 graph_->set_color("input-buffer", diagnostics::color(1.0f, 1.0f, 0.0f));\r
 144                 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));        \r
 145                 \r
 146                 int errn;\r
 147 \r
 148                 AVFormatContext* weak_format_context_ = nullptr;\r
 149                 errn = av_open_input_file(&weak_format_context_, narrow(filename).c_str(), nullptr, 0, nullptr);\r
 150                 if(errn < 0 || weak_format_context_ == nullptr)\r
 151                 {       \r
 152                         BOOST_THROW_EXCEPTION(\r
 153                                 file_read_error() << \r
 154                                 source_info(narrow(print())) << \r
 155                                 msg_info(av_error_str(errn)) <<\r
 156                                 boost::errinfo_api_function("av_open_input_file") <<\r
 157                                 boost::errinfo_errno(AVUNERROR(errn)) <<\r
 158                                 boost::errinfo_file_name(narrow(filename)));\r
 159                 }\r
 160 \r
 161                 format_context_.reset(weak_format_context_, av_close_input_file);\r
 162                         \r
 163                 errn = av_find_stream_info(format_context_.get());\r
 164                 if(errn < 0)\r
 165                 {       \r
 166                         BOOST_THROW_EXCEPTION(\r
 167                                 file_read_error() << \r
 168                                 source_info(narrow(print())) << \r
 169                                 msg_info(av_error_str(errn)) <<\r
 170                                 boost::errinfo_api_function("av_find_stream_info") <<\r
 171                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 172                 }\r
 173                 \r
 174                 errn = video_stream_.open(format_context_, AVMEDIA_TYPE_VIDEO);\r
 175                 if(errn < 0)\r
 176                         CASPAR_LOG(warning) << print() << L" Could not open video stream: " << widen(av_error_str(errn));\r
 177                 \r
 178                 errn = audio_stream_.open(format_context_, AVMEDIA_TYPE_AUDIO);\r
 179                 if(errn < 0)\r
 180                         CASPAR_LOG(warning) << print() << L" Could not open audio stream: " << widen(av_error_str(errn));\r
 181                 \r
 182                 if(!video_stream_ && !audio_stream_)\r
 183                 {       \r
 184                         BOOST_THROW_EXCEPTION(\r
 185                                 file_read_error() << \r
 186                                 source_info(narrow(print())) << \r
 187                                 msg_info("No video or audio codec context found."));    \r
 188                 }\r
 189 \r
 190                 fps_ = video_stream_ ? video_stream_.fps() : audio_stream_.fps();\r
 191 \r
 192                 if(start_ != 0)                 \r
 193                         seek_frame(start_);\r
 194 \r
 195                 for(size_t n = 0; n < 16; ++n) // Read some packets for pre-rolling.\r
 196                         read_next_packet();\r
 197                                                         \r
 198                 executor_.start();\r
 199                 executor_.begin_invoke([this]{read_file();});\r
 200                 CASPAR_LOG(info) << print() << " Started.";\r
 201         }\r
 202 \r
 203         ~implementation()\r
 204         {\r
 205                 stop();\r
 206         }\r
 207                 \r
 208 \r
 209         bool try_pop_video_packet(std::shared_ptr<AVPacket>& packet)\r
 210         {\r
 211                 return video_stream_.try_pop(packet);\r
 212         }\r
 213 \r
 214         bool try_pop_audio_packet(std::shared_ptr<AVPacket>& packet)\r
 215         {\r
 216                 return audio_stream_.try_pop(packet);\r
 217         }\r
 218 \r
 219         double fps()\r
 220         {\r
 221                 return fps_;\r
 222         }\r
 223 \r
 224 private:\r
 225 \r
 226         void stop()\r
 227         {\r
 228                 executor_.stop();\r
 229 \r
 230                 // Unblock thread.\r
 231                 std::shared_ptr<AVPacket> packet;\r
 232                 try_pop_video_packet(packet);\r
 233                 try_pop_audio_packet(packet);\r
 234 \r
 235                 CASPAR_LOG(info) << print() << " Stopping.";\r
 236         }\r
 237 \r
 238         void read_file()\r
 239         {               \r
 240                 if(video_stream_.size() > 4 || audio_stream_.size() > 4) // audio is always before video.\r
 241                         Sleep(5); // There are enough packets, no hurry.\r
 242 \r
 243                 read_next_packet();\r
 244 \r
 245                 executor_.begin_invoke([this]{read_file();});\r
 246         }\r
 247                         \r
 248         void read_next_packet()\r
 249         {               \r
 250                 try\r
 251                 {\r
 252                         std::shared_ptr<AVPacket> read_packet(new AVPacket(), [](AVPacket* p)\r
 253                         {\r
 254                                 av_free_packet(p);\r
 255                                 delete p;\r
 256                         });\r
 257 \r
 258                         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
 259                         if(is_eof(errn))                                                                                                                  // Use av_dup_packet to extend its life.\r
 260                         {\r
 261                                 if(loop_)\r
 262                                 {\r
 263                                         seek_frame(start_, AVSEEK_FLAG_BACKWARD);\r
 264                                         graph_->add_tag("seek");                \r
 265                                         CASPAR_LOG(info) << print() << " Received EOF. Looping.";                       \r
 266                                 }       \r
 267                                 else\r
 268                                 {\r
 269                                         stop();\r
 270                                         CASPAR_LOG(info) << print() << " Received EOF. Stopping.";\r
 271                                 }\r
 272                         }\r
 273                         else if(errn < 0)\r
 274                         {\r
 275                                 BOOST_THROW_EXCEPTION(\r
 276                                         file_read_error() <<\r
 277                                         msg_info(av_error_str(errn)) <<\r
 278                                         source_info(narrow(print())) << \r
 279                                         boost::errinfo_api_function("av_read_frame") <<\r
 280                                         boost::errinfo_errno(AVUNERROR(errn)));\r
 281                         }\r
 282                         else\r
 283                         {\r
 284                                 video_stream_.push(read_packet);\r
 285                                 audio_stream_.push(read_packet);\r
 286                         }\r
 287                                                 \r
 288                         graph_->update_value("input-buffer", static_cast<float>(std::max(video_stream_.size(), audio_stream_.size()))/static_cast<float>(PACKET_BUFFER_COUNT));         \r
 289                 }\r
 290                 catch(...)\r
 291                 {\r
 292                         stop();\r
 293                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 294                         return;\r
 295                 }       \r
 296         }\r
 297 \r
 298         void seek_frame(int64_t frame, int flags = 0)\r
 299         {       \r
 300                 // Convert from frames into seconds.\r
 301                 const auto ts = frame*static_cast<int64_t>(AV_TIME_BASE/fps_);\r
 302 \r
 303                 const int errn = av_seek_frame(format_context_.get(), -1, ts, flags | AVSEEK_FLAG_FRAME);\r
 304                 if(errn < 0)\r
 305                 {       \r
 306                         BOOST_THROW_EXCEPTION(\r
 307                                 invalid_operation() << \r
 308                                 source_info(narrow(print())) << \r
 309                                 msg_info(av_error_str(errn)) <<\r
 310                                 boost::errinfo_api_function("av_seek_frame") <<\r
 311                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 312                 }\r
 313         }               \r
 314 \r
 315         bool is_eof(int errn)\r
 316         {\r
 317                 if(errn == AVERROR(EIO))\r
 318                         CASPAR_LOG(warning) << print() << " Received EIO, assuming EOF";\r
 319 \r
 320                 return errn == AVERROR_EOF || errn == AVERROR(EIO); // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 321         }\r
 322         \r
 323         std::wstring print() const\r
 324         {\r
 325                 return L"ffmpeg_input[" + filename_ + L"]";\r
 326         }\r
 327 };\r
 328 \r
 329 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start) \r
 330         : impl_(new implementation(graph, filename, loop, start)){}\r
 331 const std::shared_ptr<AVCodecContext>& input::get_video_codec_context() const{return impl_->video_stream_.ctx();}\r
 332 const std::shared_ptr<AVCodecContext>& input::get_audio_codec_context() const{return impl_->audio_stream_.ctx();}\r
 333 bool input::is_running() const {return impl_->executor_.is_running();}\r
 334 bool input::try_pop_video_packet(std::shared_ptr<AVPacket>& packet){return impl_->try_pop_video_packet(packet);}\r
 335 bool input::try_pop_audio_packet(std::shared_ptr<AVPacket>& packet){return impl_->try_pop_audio_packet(packet);}\r
 336 double input::fps() const { return impl_->fps(); }\r
 337 }