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 struct input::implementation : boost::noncopyable\r
  51 {               \r
  52         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
  53 \r
  54         safe_ptr<diagnostics::graph> graph_;\r
  55 \r
  56         std::shared_ptr<AVFormatContext> format_context_;       // Destroy this last\r
  57 \r
  58         std::shared_ptr<AVCodecContext> video_codec_context_;\r
  59         std::shared_ptr<AVCodecContext> audio_codex_context_;\r
  60         \r
  61         const std::wstring      filename_;\r
  62         const bool                      loop_;\r
  63         int                                     video_s_index_;\r
  64         int                                     audio_s_index_;\r
  65         const int                       start_;\r
  66                 \r
  67         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>> video_packet_buffer_;\r
  68         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>> audio_packet_buffer_;\r
  69                 \r
  70         std::exception_ptr exception_;\r
  71         executor executor_;\r
  72 public:\r
  73         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start) \r
  74                 : graph_(graph)\r
  75                 , loop_(loop)\r
  76                 , video_s_index_(-1)\r
  77                 , audio_s_index_(-1)\r
  78                 , filename_(filename)\r
  79                 , executor_(print())\r
  80                 , start_(std::max(start, 0))\r
  81         {               \r
  82                 graph_->set_color("input-buffer", diagnostics::color(1.0f, 1.0f, 0.0f));\r
  83                 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));        \r
  84                 \r
  85                 int errn;\r
  86 \r
  87                 AVFormatContext* weak_format_context_ = nullptr;\r
  88                 errn = av_open_input_file(&weak_format_context_, narrow(filename).c_str(), nullptr, 0, nullptr);\r
  89                 if(errn < 0 || weak_format_context_ == nullptr)\r
  90                 {       \r
  91                         BOOST_THROW_EXCEPTION(\r
  92                                 file_read_error() << \r
  93                                 source_info(narrow(print())) << \r
  94                                 msg_info(av_error_str(errn)) <<\r
  95                                 boost::errinfo_api_function("av_open_input_file") <<\r
  96                                 boost::errinfo_errno(AVUNERROR(errn)) <<\r
  97                                 boost::errinfo_file_name(narrow(filename)));\r
  98                 }\r
  99 \r
 100                 format_context_.reset(weak_format_context_, av_close_input_file);\r
 101                         \r
 102                 errn = av_find_stream_info(format_context_.get());\r
 103                 if(errn < 0)\r
 104                 {       \r
 105                         BOOST_THROW_EXCEPTION(\r
 106                                 file_read_error() << \r
 107                                 source_info(narrow(print())) << \r
 108                                 msg_info(av_error_str(errn)) <<\r
 109                                 boost::errinfo_api_function("av_find_stream_info") <<\r
 110                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 111                 }\r
 112                 \r
 113                 errn = open_stream(video_codec_context_, AVMEDIA_TYPE_VIDEO, video_s_index_);\r
 114                 if(errn < 0 || !video_codec_context_)\r
 115                         CASPAR_LOG(warning) << print() << L" Could not open video stream: " << widen(av_error_str(errn));\r
 116                 \r
 117                 errn = open_stream(audio_codex_context_, AVMEDIA_TYPE_AUDIO, audio_s_index_);\r
 118                 if(errn < 0 || !audio_codex_context_)\r
 119                         CASPAR_LOG(warning) << print() << L" Could not open audio stream: " << widen(av_error_str(errn));\r
 120                 \r
 121                 if(!video_codec_context_ && !audio_codex_context_)\r
 122                 {       \r
 123                         BOOST_THROW_EXCEPTION(\r
 124                                 file_read_error() << \r
 125                                 source_info(narrow(print())) << \r
 126                                 msg_info("No video or audio codec context found."));    \r
 127                 }\r
 128 \r
 129                 video_packet_buffer_.set_capacity(PACKET_BUFFER_COUNT);\r
 130                 audio_packet_buffer_.set_capacity(PACKET_BUFFER_COUNT);\r
 131                 \r
 132                 if(start_ != 0)                 \r
 133                         seek_frame(start_);\r
 134                                         \r
 135                 executor_.start();\r
 136                 executor_.begin_invoke([this]{read_file();});\r
 137                 CASPAR_LOG(info) << print() << " Started.";\r
 138         }\r
 139 \r
 140         ~implementation()\r
 141         {\r
 142                 stop();\r
 143         }\r
 144                 \r
 145         std::shared_ptr<AVPacket> get_video_packet()\r
 146         {\r
 147                 return get_packet(video_packet_buffer_);\r
 148         }\r
 149 \r
 150         std::shared_ptr<AVPacket> get_audio_packet()\r
 151         {\r
 152                 return get_packet(audio_packet_buffer_);\r
 153         }\r
 154 \r
 155         bool has_packet() const\r
 156         {\r
 157                 return !video_packet_buffer_.empty() || !audio_packet_buffer_.empty();\r
 158         }\r
 159                                 \r
 160         double fps()\r
 161         {\r
 162                 return static_cast<double>(get_default_context()->time_base.den) / static_cast<double>(get_default_context()->time_base.num);\r
 163         }\r
 164 \r
 165 private:\r
 166 \r
 167         void stop()\r
 168         {\r
 169                 executor_.stop();\r
 170                 get_video_packet();\r
 171                 get_audio_packet();\r
 172                 CASPAR_LOG(info) << print() << " Stopping.";\r
 173         }\r
 174                         \r
 175         int open_stream(std::shared_ptr<AVCodecContext>& ctx, int codec_type, int& s_index) const\r
 176         {               \r
 177                 const auto streams = boost::iterator_range<AVStream**>(format_context_->streams, format_context_->streams+format_context_->nb_streams);\r
 178                 const auto stream = boost::find_if(streams, [&](AVStream* stream) \r
 179                 {\r
 180                         return stream != nullptr && stream->codec->codec_type == codec_type;\r
 181                 });\r
 182                 \r
 183                 if(stream == streams.end()) \r
 184                         return AVERROR_STREAM_NOT_FOUND;\r
 185                 \r
 186                 auto codec = avcodec_find_decoder((*stream)->codec->codec_id);                  \r
 187                 if(codec == nullptr)\r
 188                         return AVERROR_DECODER_NOT_FOUND;\r
 189                         \r
 190                 s_index = (*stream)->index;\r
 191 \r
 192                 int errn = tbb_avcodec_open((*stream)->codec, codec);\r
 193                 if(errn >= 0)\r
 194                 {\r
 195                         ctx.reset((*stream)->codec, tbb_avcodec_close);\r
 196 \r
 197                         // Some files give an invalid time_base numerator, try to fix it.\r
 198                         if(ctx && ctx->time_base.num == 1)\r
 199                                 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
 200                 }\r
 201                 return errn;    \r
 202         }\r
 203         \r
 204         std::shared_ptr<AVCodecContext>& get_default_context()\r
 205         {\r
 206                 return video_codec_context_ ? video_codec_context_ : audio_codex_context_;\r
 207         }\r
 208                 \r
 209         void read_file()\r
 210         {               \r
 211                 if(audio_packet_buffer_.size() > 4 && video_packet_buffer_.size() > 4)\r
 212                         boost::this_thread::sleep(boost::posix_time::millisec(5)); // There are enough packets, no hurry.\r
 213 \r
 214                 try\r
 215                 {\r
 216                         std::shared_ptr<AVPacket> read_packet(new AVPacket(), [](AVPacket* p)\r
 217                         {\r
 218                                 av_free_packet(p);\r
 219                                 delete p;\r
 220                         });\r
 221 \r
 222                         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
 223                         if(is_eof(errn))                                                                                                                  // Use av_dup_packet to extend its life.\r
 224                         {\r
 225                                 if(loop_)\r
 226                                 {\r
 227                                         seek_frame(start_, AVSEEK_FLAG_BACKWARD);\r
 228                                         graph_->add_tag("seek");                \r
 229                                         CASPAR_LOG(info) << print() << " Received EOF. Looping.";                       \r
 230                                 }       \r
 231                                 else\r
 232                                 {\r
 233                                         stop();\r
 234                                         CASPAR_LOG(info) << print() << " Received EOF. Stopping.";\r
 235                                 }\r
 236                         }\r
 237                         else if(errn < 0)\r
 238                         {\r
 239                                 BOOST_THROW_EXCEPTION(\r
 240                                         file_read_error() <<\r
 241                                         msg_info(av_error_str(errn)) <<\r
 242                                         source_info(narrow(print())) << \r
 243                                         boost::errinfo_api_function("av_read_frame") <<\r
 244                                         boost::errinfo_errno(AVUNERROR(errn)));\r
 245                         }\r
 246                         else\r
 247                         {\r
 248                                 if(read_packet->stream_index == video_s_index_)                 \r
 249                                         push_packet(video_packet_buffer_, read_packet);\r
 250                                 else if(read_packet->stream_index == audio_s_index_)    \r
 251                                         push_packet(audio_packet_buffer_, read_packet);\r
 252                         }\r
 253                                                 \r
 254                         graph_->update_value("input-buffer", static_cast<float>(video_packet_buffer_.size())/static_cast<float>(PACKET_BUFFER_COUNT));          \r
 255                 }\r
 256                 catch(...)\r
 257                 {\r
 258                         stop();\r
 259                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 260                         return;\r
 261                 }\r
 262                                                 \r
 263                 executor_.begin_invoke([this]{read_file();});           \r
 264         }\r
 265 \r
 266         void seek_frame(int64_t frame, int flags = 0)\r
 267         {       \r
 268                 // Convert from frames into seconds.\r
 269                 const auto ts = frame*static_cast<int64_t>((AV_TIME_BASE*get_default_context()->time_base.num) / get_default_context()->time_base.den);\r
 270 \r
 271                 const int errn = av_seek_frame(format_context_.get(), -1, ts, flags | AVSEEK_FLAG_FRAME);\r
 272                 if(errn < 0)\r
 273                 {       \r
 274                         BOOST_THROW_EXCEPTION(\r
 275                                 invalid_operation() << \r
 276                                 source_info(narrow(print())) << \r
 277                                 msg_info(av_error_str(errn)) <<\r
 278                                 boost::errinfo_api_function("av_seek_frame") <<\r
 279                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 280                 }\r
 281         }               \r
 282 \r
 283         bool is_eof(int errn)\r
 284         {\r
 285                 if(errn == AVERROR(EIO))\r
 286                         CASPAR_LOG(warning) << print() << " Received EIO, assuming EOF";\r
 287 \r
 288                 return errn == AVERROR_EOF || errn == AVERROR(EIO); // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 289         }\r
 290         \r
 291         void push_packet(tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>& buffer, const std::shared_ptr<AVPacket>& read_packet)\r
 292         {\r
 293                 av_dup_packet(read_packet.get());\r
 294                 buffer.push(read_packet);       \r
 295         }\r
 296 \r
 297         std::shared_ptr<AVPacket> get_packet(tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>& buffer)\r
 298         {\r
 299                 std::shared_ptr<AVPacket> packet;\r
 300                 buffer.try_pop(packet);\r
 301                 return packet;\r
 302         }\r
 303 \r
 304         std::wstring print() const\r
 305         {\r
 306                 return L"ffmpeg_input[" + filename_ + L"]";\r
 307         }\r
 308 };\r
 309 \r
 310 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start) \r
 311         : impl_(new implementation(graph, filename, loop, start)){}\r
 312 const std::shared_ptr<AVCodecContext>& input::get_video_codec_context() const{return impl_->video_codec_context_;}\r
 313 const std::shared_ptr<AVCodecContext>& input::get_audio_codec_context() const{return impl_->audio_codex_context_;}\r
 314 bool input::has_packet() const{return impl_->has_packet();}\r
 315 bool input::is_running() const {return impl_->executor_.is_running();}\r
 316 std::shared_ptr<AVPacket> input::get_video_packet(){return impl_->get_video_packet();}\r
 317 std::shared_ptr<AVPacket> input::get_audio_packet(){return impl_->get_audio_packet();}\r
 318 double input::fps() const { return impl_->fps(); }\r
 319 }