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 #include "..\stdafx.h"\r
  21 \r
  22 #include "input.h"\r
  23 #include "../ffmpeg_error.h"\r
  24 \r
  25 #include <core/video_format.h>\r
  26 \r
  27 #include <common/concurrency/executor.h>\r
  28 #include <common/diagnostics/graph.h>\r
  29 \r
  30 #include <tbb/concurrent_queue.h>\r
  31 #include <tbb/mutex.h>\r
  32 \r
  33 #if defined(_MSC_VER)\r
  34 #pragma warning (disable : 4244)\r
  35 #endif\r
  36 \r
  37 extern "C" \r
  38 {\r
  39         #define __STDC_CONSTANT_MACROS\r
  40         #define __STDC_LIMIT_MACROS\r
  41         #include <libavformat/avformat.h>\r
  42 }\r
  43 \r
  44 namespace caspar {\r
  45                 \r
  46 struct input::implementation : boost::noncopyable\r
  47 {               \r
  48         static const size_t PACKET_BUFFER_COUNT = 25;\r
  49 \r
  50         safe_ptr<diagnostics::graph> graph_;\r
  51 \r
  52         std::shared_ptr<AVFormatContext> format_context_;       // Destroy this last\r
  53 \r
  54         std::shared_ptr<AVCodecContext> video_codec_context_;\r
  55         std::shared_ptr<AVCodecContext> audio_codex_context_;\r
  56         \r
  57         const std::wstring      filename_;\r
  58         const bool                      loop_;\r
  59         int                                     video_s_index_;\r
  60         int                                     audio_s_index_;\r
  61         const int                       start_;\r
  62         const int                       length_;\r
  63         int                                     eof_count_;\r
  64                 \r
  65         tbb::concurrent_bounded_queue<packet> video_packet_buffer_;\r
  66         tbb::concurrent_bounded_queue<packet> audio_packet_buffer_;\r
  67 \r
  68         boost::condition_variable       cond_;\r
  69         boost::mutex                            mutex_;\r
  70         \r
  71         std::exception_ptr exception_;\r
  72         executor executor_;\r
  73 public:\r
  74         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start, int length) \r
  75                 : graph_(graph)\r
  76                 , loop_(loop)\r
  77                 , video_s_index_(-1)\r
  78                 , audio_s_index_(-1)\r
  79                 , filename_(filename)\r
  80                 , executor_(print())\r
  81                 , start_(std::max(start, 0))\r
  82                 , length_(length)\r
  83                 , eof_count_(length)\r
  84         {                       \r
  85                 graph_->set_color("input-buffer", diagnostics::color(1.0f, 1.0f, 0.0f));\r
  86                 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));        \r
  87 \r
  88                 int errn;\r
  89                 AVFormatContext* weak_format_context_ = nullptr;\r
  90                 if((errn = av_open_input_file(&weak_format_context_, narrow(filename).c_str(), nullptr, 0, nullptr)) < 0 || weak_format_context_ == nullptr)\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                 format_context_.reset(weak_format_context_, av_close_input_file);\r
 100                         \r
 101                 if((errn = av_find_stream_info(format_context_.get())) < 0)\r
 102                 {       \r
 103                         BOOST_THROW_EXCEPTION(\r
 104                                 file_read_error() << \r
 105                                 source_info(narrow(print())) << \r
 106                                 msg_info(av_error_str(errn)) <<\r
 107                                 boost::errinfo_api_function("av_find_stream_info") <<\r
 108                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 109                 }\r
 110 \r
 111                 video_codec_context_ = open_stream(CODEC_TYPE_VIDEO, video_s_index_);\r
 112                 if(!video_codec_context_)\r
 113                         CASPAR_LOG(warning) << print() << " Could not open any video stream.";\r
 114                 else\r
 115                         fix_time_base(video_codec_context_.get());\r
 116                 \r
 117                 audio_codex_context_ = open_stream(CODEC_TYPE_AUDIO, audio_s_index_);\r
 118                 if(!audio_codex_context_)\r
 119                         CASPAR_LOG(warning) << print() << " Could not open any audio stream.";\r
 120                 else\r
 121                         fix_time_base(audio_codex_context_.get());\r
 122 \r
 123                 if(!video_codec_context_ && !audio_codex_context_)\r
 124                 {       \r
 125                         BOOST_THROW_EXCEPTION(\r
 126                                 file_read_error() << \r
 127                                 msg_info(av_error_str(errn)) <<\r
 128                                 source_info(narrow(print())) << \r
 129                                 msg_info("No video or audio codec context found."));    \r
 130                 }\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                 executor_.clear();\r
 143                 executor_.stop();\r
 144                 cond_.notify_all();\r
 145         }\r
 146                 \r
 147         packet get_video_packet()\r
 148         {\r
 149                 return get_packet(video_packet_buffer_);\r
 150         }\r
 151 \r
 152         packet get_audio_packet()\r
 153         {\r
 154                 return get_packet(audio_packet_buffer_);\r
 155         }\r
 156 \r
 157         bool has_packet() const\r
 158         {\r
 159                 return !video_packet_buffer_.empty() || !audio_packet_buffer_.empty();\r
 160         }\r
 161                                 \r
 162         double fps()\r
 163         {\r
 164                 return static_cast<double>(get_default_context()->time_base.den) / static_cast<double>(get_default_context()->time_base.num);\r
 165         }\r
 166 \r
 167 private:\r
 168 \r
 169         void stop()\r
 170         {\r
 171                 executor_.stop();\r
 172                 CASPAR_LOG(info) << print() << " Stopped.";\r
 173         }\r
 174                         \r
 175         void fix_time_base(AVCodecContext* context) const // Some files give an invalid numerator, try to fix it.\r
 176         {\r
 177                 if(context && context->time_base.num == 1)\r
 178                         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
 179         }\r
 180 \r
 181         std::shared_ptr<AVCodecContext> open_stream(int codec_type, int& s_index) const\r
 182         {               \r
 183                 AVStream** streams_end = format_context_->streams+format_context_->nb_streams;\r
 184                 AVStream** stream = std::find_if(format_context_->streams, streams_end, [&](AVStream* stream) \r
 185                 {\r
 186                         return stream != nullptr && stream->codec->codec_type == codec_type;\r
 187                 });\r
 188                 \r
 189                 if(stream == streams_end) \r
 190                         return nullptr;\r
 191                 \r
 192                 auto codec = avcodec_find_decoder((*stream)->codec->codec_id);                  \r
 193                 if(codec == nullptr)\r
 194                         return nullptr;\r
 195                         \r
 196                 if((-avcodec_open((*stream)->codec, codec)) > 0)                \r
 197                         return nullptr;\r
 198                 \r
 199                 s_index = (*stream)->index;\r
 200 \r
 201                 return std::shared_ptr<AVCodecContext>((*stream)->codec, avcodec_close);\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                 try\r
 212                 {\r
 213                         AVPacket tmp_packet;\r
 214                         safe_ptr<AVPacket> read_packet(&tmp_packet, av_free_packet);    \r
 215 \r
 216                         const int errn = av_read_frame(format_context_.get(), read_packet.get());\r
 217                         if(is_eof(errn))\r
 218                         {\r
 219                                 if(loop_)\r
 220                                 {\r
 221                                         seek_frame(start_, AVSEEK_FLAG_BACKWARD);\r
 222                                         // AVCodecContext.frame_number is not reset. Increase the target frame_number.\r
 223                                         eof_count_ += length_; \r
 224                                         graph_->add_tag("seek");        \r
 225                                 }       \r
 226                                 else\r
 227                                         stop();\r
 228                         }\r
 229                         else if(errn < 0)\r
 230                         {\r
 231                                 BOOST_THROW_EXCEPTION(\r
 232                                         invalid_operation() <<\r
 233                                         msg_info(av_error_str(errn)) <<\r
 234                                         source_info(narrow(print())) << \r
 235                                         boost::errinfo_api_function("av_read_frame") <<\r
 236                                         boost::errinfo_errno(AVUNERROR(errn)));\r
 237                         }\r
 238                         else\r
 239                         {\r
 240                                 if(read_packet->stream_index == video_s_index_)                 \r
 241                                         video_packet_buffer_.try_push(packet(read_packet->data, read_packet->data + read_packet->size));        \r
 242                                 else if(read_packet->stream_index)\r
 243                                         audio_packet_buffer_.try_push(packet(read_packet->data, read_packet->data + read_packet->size));        \r
 244                         }\r
 245                                                 \r
 246                         graph_->update_value("input-buffer", static_cast<float>(video_packet_buffer_.size())/static_cast<float>(PACKET_BUFFER_COUNT));          \r
 247                 }\r
 248                 catch(...)\r
 249                 {\r
 250                         stop();\r
 251                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 252                         return;\r
 253                 }\r
 254                                 \r
 255                 executor_.begin_invoke([this]{read_file();});           \r
 256                 boost::unique_lock<boost::mutex> lock(mutex_);\r
 257                 while(executor_.is_running() && audio_packet_buffer_.size() > PACKET_BUFFER_COUNT && video_packet_buffer_.size() > PACKET_BUFFER_COUNT)\r
 258                         cond_.wait(lock);               \r
 259         }\r
 260 \r
 261         void seek_frame(int64_t frame, int flags = 0)\r
 262         {       \r
 263                 // Convert from frames into seconds.\r
 264                 auto ts = frame*static_cast<int64_t>((AV_TIME_BASE*get_default_context()->time_base.num) / get_default_context()->time_base.den);\r
 265 \r
 266                 const int errn = av_seek_frame(format_context_.get(), -1, ts, flags | AVSEEK_FLAG_FRAME);\r
 267 \r
 268                 if(errn < 0)\r
 269                 {       \r
 270                         BOOST_THROW_EXCEPTION(\r
 271                                 invalid_operation() << \r
 272                                 source_info(narrow(print())) << \r
 273                                 msg_info(av_error_str(errn)) <<\r
 274                                 boost::errinfo_api_function("seek_frame") <<\r
 275                                 boost::errinfo_errno(AVUNERROR(errn)));\r
 276                 }\r
 277 \r
 278                 // Notify decoders to flush buffers.\r
 279                 video_packet_buffer_.try_push(flush_packet);    \r
 280                 audio_packet_buffer_.try_push(flush_packet);\r
 281         }               \r
 282 \r
 283         bool is_eof(int errn)\r
 284         {\r
 285                 if(length_ != -1)\r
 286                         return get_default_context()->frame_number > eof_count_;                \r
 287 \r
 288                 return errn == AVERROR_EOF || errn == AVERROR_IO;\r
 289         }\r
 290                 \r
 291         packet get_packet(tbb::concurrent_bounded_queue<packet>& buffer)\r
 292         {\r
 293                 packet packet;\r
 294                 buffer.try_pop(packet);\r
 295                 cond_.notify_all();\r
 296                 return packet;\r
 297         }\r
 298 \r
 299         std::wstring print() const\r
 300         {\r
 301                 return L"ffmpeg_input[" + filename_ + L"]";\r
 302         }\r
 303 };\r
 304 \r
 305 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start, int length) \r
 306         : impl_(new implementation(graph, filename, loop, start, length)){}\r
 307 const std::shared_ptr<AVCodecContext>& input::get_video_codec_context() const{return impl_->video_codec_context_;}\r
 308 const std::shared_ptr<AVCodecContext>& input::get_audio_codec_context() const{return impl_->audio_codex_context_;}\r
 309 bool input::has_packet() const{return impl_->has_packet();}\r
 310 bool input::is_running() const {return impl_->executor_.is_running();}\r
 311 packet input::get_video_packet(){return impl_->get_video_packet();}\r
 312 packet input::get_audio_packet(){return impl_->get_audio_packet();}\r
 313 double input::fps() const { return impl_->fps(); }\r
 314 }