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 \r
  24 #include <core/video_format.h>\r
  25 \r
  26 #include <common/concurrency/executor.h>\r
  27 #include <common/diagnostics/graph.h>\r
  28 \r
  29 #include <tbb/concurrent_queue.h>\r
  30 #include <tbb/queuing_mutex.h>\r
  31 \r
  32 #include <boost/exception/error_info.hpp>\r
  33 #include <boost/thread/once.hpp>\r
  34 #include <boost/thread/thread.hpp>\r
  35 \r
  36 #include <errno.h>\r
  37 #include <system_error>\r
  38                 \r
  39 #if defined(_MSC_VER)\r
  40 #pragma warning (disable : 4244)\r
  41 #endif\r
  42 \r
  43 extern "C" \r
  44 {\r
  45         #define __STDC_CONSTANT_MACROS\r
  46         #define __STDC_LIMIT_MACROS\r
  47         #include <libavformat/avformat.h>\r
  48 }\r
  49 \r
  50 namespace caspar {\r
  51                 \r
  52 struct input::implementation : boost::noncopyable\r
  53 {               \r
  54         static const size_t PACKET_BUFFER_COUNT = 50;\r
  55 \r
  56         safe_ptr<diagnostics::graph> graph_;\r
  57 \r
  58         std::shared_ptr<AVFormatContext> format_context_;       // Destroy this last\r
  59 \r
  60         std::shared_ptr<AVCodecContext> video_codec_context_;\r
  61         std::shared_ptr<AVCodecContext> audio_codex_context_;\r
  62         \r
  63         const std::wstring filename_;\r
  64 \r
  65         bool loop_;\r
  66         int video_s_index_;\r
  67         int     audio_s_index_;\r
  68                 \r
  69         tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>> video_packet_buffer_;\r
  70         tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>> audio_packet_buffer_;\r
  71 \r
  72         boost::condition_variable cond_;\r
  73         boost::mutex mutex_;\r
  74         \r
  75         executor executor_;\r
  76 public:\r
  77         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop) \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         {                       \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_;\r
  90                 if((errn = -av_open_input_file(&weak_format_context_, narrow(filename).c_str(), nullptr, 0, nullptr)) > 0)\r
  91                         BOOST_THROW_EXCEPTION(\r
  92                                 file_read_error() << \r
  93                                 source_info(narrow(print())) << \r
  94                                 msg_info("No format context found.") << \r
  95                                 boost::errinfo_api_function("av_open_input_file") <<\r
  96                                 boost::errinfo_errno(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                         BOOST_THROW_EXCEPTION(\r
 103                                 file_read_error() << \r
 104                                 source_info(narrow(print())) << \r
 105                                 boost::errinfo_api_function("av_find_stream_info") <<\r
 106                                 msg_info("No stream found.") << \r
 107                                 boost::errinfo_errno(errn));\r
 108 \r
 109                 video_codec_context_ = open_stream(CODEC_TYPE_VIDEO, video_s_index_);\r
 110                 if(!video_codec_context_)\r
 111                         CASPAR_LOG(warning) << print() << " Could not open any video stream.";\r
 112                 else\r
 113                         fix_time_base(video_codec_context_.get());\r
 114                 \r
 115                 audio_codex_context_ = open_stream(CODEC_TYPE_AUDIO, audio_s_index_);\r
 116                 if(!audio_codex_context_)\r
 117                         CASPAR_LOG(warning) << print() << " Could not open any audio stream.";\r
 118                 else\r
 119                         fix_time_base(video_codec_context_.get());\r
 120 \r
 121                 if(!video_codec_context_ && !audio_codex_context_)\r
 122                         BOOST_THROW_EXCEPTION(\r
 123                                 file_read_error() << \r
 124                                 source_info(narrow(print())) << \r
 125                                 msg_info("No video or audio codec context found."));            \r
 126                         \r
 127                 executor_.start();\r
 128                 executor_.begin_invoke([this]{read_file();});\r
 129                 CASPAR_LOG(info) << print() << " Started.";\r
 130         }\r
 131 \r
 132         ~implementation()\r
 133         {\r
 134                 executor_.clear();\r
 135                 executor_.stop();\r
 136                 cond_.notify_all();\r
 137                 CASPAR_LOG(info) << print() << " Stopped.";\r
 138         }\r
 139                         \r
 140         void fix_time_base(AVCodecContext* context) // Some files give an invalid numerator, try to fix it.\r
 141         {\r
 142                 if(context && context->time_base.num == 1)\r
 143                         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
 144         }\r
 145 \r
 146         std::shared_ptr<AVCodecContext> open_stream(int codec_type, int& s_index)\r
 147         {               \r
 148                 AVStream** streams_end = format_context_->streams+format_context_->nb_streams;\r
 149                 AVStream** stream = std::find_if(format_context_->streams, streams_end, \r
 150                         [&](AVStream* stream) { return stream != nullptr && stream->codec->codec_type == codec_type ;});\r
 151                 \r
 152                 if(stream == streams_end) \r
 153                         return nullptr;\r
 154 \r
 155                 s_index = (*stream)->index;\r
 156                 \r
 157                 auto codec = avcodec_find_decoder((*stream)->codec->codec_id);                  \r
 158                 if(codec == nullptr)\r
 159                         return nullptr;\r
 160                         \r
 161                 if((-avcodec_open((*stream)->codec, codec)) > 0)                \r
 162                         return nullptr;\r
 163 \r
 164                 return std::shared_ptr<AVCodecContext>((*stream)->codec, avcodec_close);\r
 165         }\r
 166                 \r
 167         void read_file()\r
 168         {                                       \r
 169                 AVPacket tmp_packet;\r
 170                 safe_ptr<AVPacket> read_packet(&tmp_packet, av_free_packet);    \r
 171 \r
 172                 if (av_read_frame(format_context_.get(), read_packet.get()) >= 0) // NOTE: read_packet is only valid until next call of av_read_frame or av_close_input_file\r
 173                 {\r
 174                         auto packet = std::make_shared<aligned_buffer>(read_packet->data, read_packet->data + read_packet->size);\r
 175                         if(read_packet->stream_index == video_s_index_)                 \r
 176                                 video_packet_buffer_.try_push(std::move(packet));       \r
 177                         else if(read_packet->stream_index == audio_s_index_)    \r
 178                                 audio_packet_buffer_.try_push(std::move(packet));               \r
 179                 }\r
 180                 else if(!loop_ || av_seek_frame(format_context_.get(), -1, 0, AVSEEK_FLAG_BACKWARD) < 0) // TODO: av_seek_frame does not work for all formats\r
 181                 {\r
 182                         executor_.stop();\r
 183                         CASPAR_LOG(info) << print() << " eof";\r
 184                 }       \r
 185                 else\r
 186                         graph_->add_tag("seek");                \r
 187                                         \r
 188                 graph_->update_value("input-buffer", static_cast<float>(video_packet_buffer_.size())/static_cast<float>(PACKET_BUFFER_COUNT));          \r
 189                 \r
 190                 executor_.begin_invoke([this]{read_file();});           \r
 191                 boost::unique_lock<boost::mutex> lock(mutex_);\r
 192                 while(executor_.is_running() && audio_packet_buffer_.size() > PACKET_BUFFER_COUNT && video_packet_buffer_.size() > PACKET_BUFFER_COUNT)\r
 193                         cond_.wait(lock);               \r
 194         }\r
 195                 \r
 196         aligned_buffer get_video_packet()\r
 197         {\r
 198                 return get_packet(video_packet_buffer_);\r
 199         }\r
 200 \r
 201         aligned_buffer get_audio_packet()\r
 202         {\r
 203                 return get_packet(audio_packet_buffer_);\r
 204         }\r
 205         \r
 206         aligned_buffer get_packet(tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>>& buffer)\r
 207         {\r
 208                 cond_.notify_all();\r
 209                 std::shared_ptr<aligned_buffer> packet;\r
 210                 return buffer.try_pop(packet) ? std::move(*packet) : aligned_buffer();\r
 211         }\r
 212 \r
 213         bool is_eof() const\r
 214         {\r
 215                 return !executor_.is_running() && video_packet_buffer_.empty() && audio_packet_buffer_.empty();\r
 216         }\r
 217                 \r
 218         double fps() const\r
 219         {\r
 220                 return static_cast<double>(video_codec_context_->time_base.den) / static_cast<double>(video_codec_context_->time_base.num);\r
 221         }\r
 222 \r
 223         std::wstring print() const\r
 224         {\r
 225                 return L"ffmpeg_input";\r
 226         }\r
 227 };\r
 228 \r
 229 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop) : impl_(new implementation(graph, filename, loop)){}\r
 230 const std::shared_ptr<AVCodecContext>& input::get_video_codec_context() const{return impl_->video_codec_context_;}\r
 231 const std::shared_ptr<AVCodecContext>& input::get_audio_codec_context() const{return impl_->audio_codex_context_;}\r
 232 bool input::is_eof() const{return impl_->is_eof();}\r
 233 bool input::is_running() const {return impl_->executor_.is_running();}\r
 234 aligned_buffer input::get_video_packet(){return impl_->get_video_packet();}\r
 235 aligned_buffer input::get_audio_packet(){return impl_->get_audio_packet();}\r
 236 double input::fps() const { return impl_->fps(); }\r
 237 }