git.sesse.net Git - casparcg/blob - core/producer/ffmpeg/input.cpp

   1 #include "..\..\stdafx.h"\r
   2 \r
   3 #include "input.h"\r
   4 \r
   5 #include "../../format/video_format.h"\r
   6 \r
   7 #include <common/concurrency/executor.h>\r
   8 \r
   9 #include <tbb/concurrent_queue.h>\r
  10 #include <tbb/queuing_mutex.h>\r
  11 \r
  12 #include <boost/exception/error_info.hpp>\r
  13 #include <boost/thread/once.hpp>\r
  14 \r
  15 #include <errno.h>\r
  16 #include <system_error>\r
  17                 \r
  18 #if defined(_MSC_VER)\r
  19 #pragma warning (disable : 4244)\r
  20 #endif\r
  21 \r
  22 \r
  23 extern "C" \r
  24 {\r
  25         #define __STDC_CONSTANT_MACROS\r
  26         #define __STDC_LIMIT_MACROS\r
  27         #include <libavformat/avformat.h>\r
  28 }\r
  29 \r
  30 namespace caspar { namespace core { namespace ffmpeg{\r
  31                 \r
  32 struct input::implementation : boost::noncopyable\r
  33 {                               \r
  34         std::shared_ptr<AVFormatContext>        format_context_;        // Destroy this last\r
  35 \r
  36         std::shared_ptr<AVCodecContext>         video_codec_context_;\r
  37         std::shared_ptr<AVCodecContext>         audio_codex_context_;\r
  38 \r
  39         tbb::queuing_mutex                                      seek_mutex_;\r
  40 \r
  41         const std::wstring                                      filename_;\r
  42 \r
  43         tbb::atomic<bool>                                       loop_;\r
  44         int                                                                     video_s_index_;\r
  45         int                                                                     audio_s_index_;\r
  46 \r
  47         tbb::atomic<size_t>     buffer_size_;\r
  48         \r
  49         tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>> video_packet_buffer_;\r
  50         tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>> audio_packet_buffer_;\r
  51         \r
  52         executor executor_;\r
  53 \r
  54         static const size_t BUFFER_SIZE = 2 << 25;\r
  55 \r
  56 public:\r
  57         explicit implementation(const std::wstring& filename) \r
  58                 : video_s_index_(-1)\r
  59                 , audio_s_index_(-1)\r
  60                 , filename_(filename)\r
  61         {               \r
  62                 static boost::once_flag av_register_all_flag = BOOST_ONCE_INIT;\r
  63                 boost::call_once(av_register_all, av_register_all_flag);        \r
  64                 \r
  65                 static boost::once_flag avcodec_init_flag = BOOST_ONCE_INIT;\r
  66                 boost::call_once(avcodec_init, avcodec_init_flag);      \r
  67 \r
  68                 loop_ = false;  \r
  69                 \r
  70                 int errn;\r
  71                 AVFormatContext* weak_format_context_;\r
  72                 if((errn = -av_open_input_file(&weak_format_context_, narrow(filename).c_str(), nullptr, 0, nullptr)) > 0)\r
  73                         BOOST_THROW_EXCEPTION(\r
  74                                 file_read_error() << \r
  75                                 msg_info("No format context found.") << \r
  76                                 boost::errinfo_api_function("av_open_input_file") <<\r
  77                                 boost::errinfo_errno(errn) <<\r
  78                                 boost::errinfo_file_name(narrow(filename)));\r
  79 \r
  80                 format_context_.reset(weak_format_context_, av_close_input_file);\r
  81                         \r
  82                 if((errn = -av_find_stream_info(format_context_.get())) > 0)\r
  83                         BOOST_THROW_EXCEPTION(\r
  84                                 file_read_error() << \r
  85                                 boost::errinfo_api_function("av_find_stream_info") <<\r
  86                                 msg_info("No stream found.") << \r
  87                                 boost::errinfo_errno(errn));\r
  88 \r
  89                 video_codec_context_ = open_stream(CODEC_TYPE_VIDEO, video_s_index_);\r
  90                 if(!video_codec_context_)\r
  91                         CASPAR_LOG(warning) << "Could not open any video stream.";\r
  92                 \r
  93                 audio_codex_context_ = open_stream(CODEC_TYPE_AUDIO, audio_s_index_);\r
  94                 if(!audio_codex_context_)\r
  95                         CASPAR_LOG(warning) << "Could not open any audio stream.";\r
  96 \r
  97                 if(!video_codec_context_ && !audio_codex_context_)\r
  98                         BOOST_THROW_EXCEPTION(file_read_error() << msg_info("No video or audio codec context found."));         \r
  99                         \r
 100                 executor_.start();\r
 101                 executor_.begin_invoke([this]{read_file();});\r
 102                 CASPAR_LOG(info) << print() << " started.";\r
 103         }\r
 104 \r
 105         ~implementation()\r
 106         {\r
 107                 CASPAR_LOG(info) << print() << " ended.";\r
 108         }\r
 109                                                         \r
 110         std::shared_ptr<AVCodecContext> open_stream(int codec_type, int& s_index)\r
 111         {               \r
 112                 AVStream** streams_end = format_context_->streams+format_context_->nb_streams;\r
 113                 AVStream** stream = std::find_if(format_context_->streams, streams_end, \r
 114                         [&](AVStream* stream) { return stream != nullptr && stream->codec->codec_type == codec_type ;});\r
 115                 \r
 116                 if(stream == streams_end) \r
 117                         return nullptr;\r
 118 \r
 119                 s_index = (*stream)->index;\r
 120                 \r
 121                 auto codec = avcodec_find_decoder((*stream)->codec->codec_id);                  \r
 122                 if(codec == nullptr)\r
 123                         return nullptr;\r
 124                         \r
 125                 if((-avcodec_open((*stream)->codec, codec)) > 0)                \r
 126                         return nullptr;\r
 127 \r
 128                 return std::shared_ptr<AVCodecContext>((*stream)->codec, avcodec_close);\r
 129         }\r
 130                 \r
 131         void read_file() // For every packet taken: read in a number of packets.\r
 132         {               \r
 133                 for(size_t n = 0; buffer_size_ < BUFFER_SIZE && (n < 3 || video_packet_buffer_.size() < 3 || audio_packet_buffer_.size() < 3) && executor_.is_running(); ++n)\r
 134                 {\r
 135                         AVPacket tmp_packet;\r
 136                         safe_ptr<AVPacket> read_packet(&tmp_packet, av_free_packet);    \r
 137                         tbb::queuing_mutex::scoped_lock lock(seek_mutex_);      \r
 138 \r
 139                         if (av_read_frame(format_context_.get(), read_packet.get()) >= 0) // NOTE: read_packet is only valid until next call of av_safe_ptr<read_frame> or av_close_input_file\r
 140                         {\r
 141                                 auto packet = std::make_shared<aligned_buffer>(read_packet->data, read_packet->data + read_packet->size);\r
 142                                 if(read_packet->stream_index == video_s_index_)                                                 \r
 143                                 {\r
 144                                         buffer_size_ += packet->size();\r
 145                                         video_packet_buffer_.try_push(std::move(packet));                                               \r
 146                                 }\r
 147                                 else if(read_packet->stream_index == audio_s_index_)    \r
 148                                 {\r
 149                                         buffer_size_ += packet->size();\r
 150                                         audio_packet_buffer_.try_push(std::move(packet));\r
 151                                 }\r
 152                         }\r
 153                         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
 154                                 executor_.stop(executor::no_wait);\r
 155                 }\r
 156         }\r
 157                 \r
 158         aligned_buffer get_video_packet()\r
 159         {\r
 160                 return get_packet(video_packet_buffer_);\r
 161         }\r
 162 \r
 163         aligned_buffer get_audio_packet()\r
 164         {\r
 165                 return get_packet(audio_packet_buffer_);\r
 166         }\r
 167         \r
 168         aligned_buffer get_packet(tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>>& buffer)\r
 169         {\r
 170                 std::shared_ptr<aligned_buffer> packet;\r
 171                 if(buffer.try_pop(packet))\r
 172                 {\r
 173                         buffer_size_ -= packet->size();\r
 174                         if(executor_.size() < 4)\r
 175                                 executor_.begin_invoke([this]{read_file();});\r
 176                         return std::move(*packet);\r
 177                 }\r
 178                 return aligned_buffer();\r
 179         }\r
 180 \r
 181         bool is_eof() const\r
 182         {\r
 183                 return !executor_.is_running() && video_packet_buffer_.empty() && audio_packet_buffer_.empty();\r
 184         }\r
 185                 \r
 186         // TODO: Not properly done.\r
 187         bool seek(unsigned long long seek_target)\r
 188         {\r
 189                 tbb::queuing_mutex::scoped_lock lock(seek_mutex_);\r
 190                 if(av_seek_frame(format_context_.get(), -1, seek_target*AV_TIME_BASE, 0) < 0)\r
 191                         return false;\r
 192 \r
 193                 return true;\r
 194         }\r
 195 \r
 196         double fps() const\r
 197         {\r
 198                 return static_cast<double>(video_codec_context_->time_base.den) / static_cast<double>(video_codec_context_->time_base.num);\r
 199         }\r
 200 \r
 201         std::wstring print() const\r
 202         {\r
 203                 return L"ffmpeg[" + boost::filesystem::wpath(filename_).filename() + L"] Buffer thread";\r
 204         }\r
 205 };\r
 206 \r
 207 input::input(const std::wstring& filename) : impl_(new implementation(filename)){}\r
 208 void input::set_loop(bool value){impl_->loop_ = value;}\r
 209 const std::shared_ptr<AVCodecContext>& input::get_video_codec_context() const{return impl_->video_codec_context_;}\r
 210 const std::shared_ptr<AVCodecContext>& input::get_audio_codec_context() const{return impl_->audio_codex_context_;}\r
 211 bool input::is_eof() const{return impl_->is_eof();}\r
 212 aligned_buffer input::get_video_packet(){return impl_->get_video_packet();}\r
 213 aligned_buffer input::get_audio_packet(){return impl_->get_audio_packet();}\r
 214 bool input::seek(unsigned long long frame){return impl_->seek(frame);}\r
 215 double input::fps() const { return impl_->fps(); }\r
 216 }}}