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         static const size_t BUFFER_SIZE = 2 << 25;\r
  35 \r
  36         implementation(const std::wstring& filename) : video_s_index_(-1), audio_s_index_(-1), filename_(filename)\r
  37         {               \r
  38                 static boost::once_flag av_register_all_flag = BOOST_ONCE_INIT;\r
  39                 boost::call_once(av_register_all, av_register_all_flag);        \r
  40                 \r
  41                 static boost::once_flag avcodec_init_flag = BOOST_ONCE_INIT;\r
  42                 boost::call_once(avcodec_init, avcodec_init_flag);      \r
  43 \r
  44                 loop_ = false;  \r
  45                 \r
  46                 int errn;\r
  47                 AVFormatContext* weak_format_context_;\r
  48                 if((errn = -av_open_input_file(&weak_format_context_, narrow(filename).c_str(), nullptr, 0, nullptr)) > 0)\r
  49                         BOOST_THROW_EXCEPTION(\r
  50                                 file_read_error() << \r
  51                                 msg_info("No format context found.") << \r
  52                                 boost::errinfo_api_function("av_open_input_file") <<\r
  53                                 boost::errinfo_errno(errn) <<\r
  54                                 boost::errinfo_file_name(narrow(filename)));\r
  55 \r
  56                 format_context_.reset(weak_format_context_, av_close_input_file);\r
  57                         \r
  58                 if((errn = -av_find_stream_info(format_context_.get())) > 0)\r
  59                         BOOST_THROW_EXCEPTION(\r
  60                                 file_read_error() << \r
  61                                 boost::errinfo_api_function("av_find_stream_info") <<\r
  62                                 msg_info("No stream found.") << \r
  63                                 boost::errinfo_errno(errn));\r
  64 \r
  65                 video_codec_context_ = open_stream(CODEC_TYPE_VIDEO, video_s_index_);\r
  66                 if(!video_codec_context_)\r
  67                         CASPAR_LOG(warning) << "Could not open any video stream.";\r
  68                 \r
  69                 audio_codex_context_ = open_stream(CODEC_TYPE_AUDIO, audio_s_index_);\r
  70                 if(!audio_codex_context_)\r
  71                         CASPAR_LOG(warning) << "Could not open any audio stream.";\r
  72 \r
  73                 if(!video_codec_context_ && !audio_codex_context_)\r
  74                         BOOST_THROW_EXCEPTION(file_read_error() << msg_info("No video or audio codec context found."));         \r
  75                         \r
  76                 executor_.start();\r
  77                 executor_.begin_invoke([this]{read_file();});\r
  78                 CASPAR_LOG(info) << print() << " started.";\r
  79         }\r
  80 \r
  81         ~implementation()\r
  82         {\r
  83                 CASPAR_LOG(info) << print() << " ended.";\r
  84         }\r
  85                                                         \r
  86         std::shared_ptr<AVCodecContext> open_stream(int codec_type, int& s_index)\r
  87         {               \r
  88                 AVStream** streams_end = format_context_->streams+format_context_->nb_streams;\r
  89                 AVStream** stream = std::find_if(format_context_->streams, streams_end, \r
  90                         [&](AVStream* stream) { return stream != nullptr && stream->codec->codec_type == codec_type ;});\r
  91                 \r
  92                 if(stream == streams_end) \r
  93                         return nullptr;\r
  94 \r
  95                 s_index = (*stream)->index;\r
  96                 \r
  97                 auto codec = avcodec_find_decoder((*stream)->codec->codec_id);                  \r
  98                 if(codec == nullptr)\r
  99                         return nullptr;\r
 100                         \r
 101                 if((-avcodec_open((*stream)->codec, codec)) > 0)                \r
 102                         return nullptr;\r
 103 \r
 104                 return std::shared_ptr<AVCodecContext>((*stream)->codec, avcodec_close);\r
 105         }\r
 106                 \r
 107         void read_file() // For every packet taken: read in a number of packets.\r
 108         {               \r
 109                 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
 110                 {\r
 111                         AVPacket tmp_packet;\r
 112                         safe_ptr<AVPacket> read_packet(&tmp_packet, av_free_packet);    \r
 113                         tbb::queuing_mutex::scoped_lock lock(seek_mutex_);      \r
 114 \r
 115                         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
 116                         {\r
 117                                 auto packet = std::make_shared<aligned_buffer>(read_packet->data, read_packet->data + read_packet->size);\r
 118                                 if(read_packet->stream_index == video_s_index_)                                                 \r
 119                                 {\r
 120                                         buffer_size_ += packet->size();\r
 121                                         video_packet_buffer_.try_push(std::move(packet));                                               \r
 122                                 }\r
 123                                 else if(read_packet->stream_index == audio_s_index_)    \r
 124                                 {\r
 125                                         buffer_size_ += packet->size();\r
 126                                         audio_packet_buffer_.try_push(std::move(packet));\r
 127                                 }\r
 128                         }\r
 129                         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
 130                                 executor_.stop(executor::no_wait);\r
 131                 }\r
 132         }\r
 133                 \r
 134         aligned_buffer get_video_packet()\r
 135         {\r
 136                 return get_packet(video_packet_buffer_);\r
 137         }\r
 138 \r
 139         aligned_buffer get_audio_packet()\r
 140         {\r
 141                 return get_packet(audio_packet_buffer_);\r
 142         }\r
 143         \r
 144         aligned_buffer get_packet(tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>>& buffer)\r
 145         {\r
 146                 std::shared_ptr<aligned_buffer> packet;\r
 147                 if(buffer.try_pop(packet))\r
 148                 {\r
 149                         buffer_size_ -= packet->size();\r
 150                         if(executor_.size() < 4)\r
 151                                 executor_.begin_invoke([this]{read_file();});\r
 152                         return std::move(*packet);\r
 153                 }\r
 154                 return aligned_buffer();\r
 155         }\r
 156 \r
 157         bool is_eof() const\r
 158         {\r
 159                 return !executor_.is_running() && video_packet_buffer_.empty() && audio_packet_buffer_.empty();\r
 160         }\r
 161                 \r
 162         // TODO: Not properly done.\r
 163         bool seek(unsigned long long seek_target)\r
 164         {\r
 165                 tbb::queuing_mutex::scoped_lock lock(seek_mutex_);\r
 166                 if(av_seek_frame(format_context_.get(), -1, seek_target*AV_TIME_BASE, 0) < 0)\r
 167                         return false;\r
 168                 \r
 169                 video_packet_buffer_.clear();\r
 170                 audio_packet_buffer_.clear();\r
 171                 // TODO: Not sure its enough to just flush in input class\r
 172                 if(video_codec_context_)\r
 173                         avcodec_flush_buffers(video_codec_context_.get());\r
 174                 if(audio_codex_context_)\r
 175                         avcodec_flush_buffers(audio_codex_context_.get());\r
 176                 return true;\r
 177         }\r
 178 \r
 179         std::wstring print() const\r
 180         {\r
 181                 return L"ffmpeg[" + boost::filesystem::wpath(filename_).filename() + L"] Buffer thread";\r
 182         }\r
 183                                 \r
 184         std::shared_ptr<AVFormatContext>        format_context_;        // Destroy this last\r
 185 \r
 186         tbb::queuing_mutex                                      seek_mutex_;\r
 187 \r
 188         const std::wstring                                      filename_;\r
 189 \r
 190         std::shared_ptr<AVCodecContext>         video_codec_context_;\r
 191 \r
 192         std::shared_ptr<AVCodecContext>         audio_codex_context_;\r
 193 \r
 194         tbb::atomic<bool>                                       loop_;\r
 195         int                                                                     video_s_index_;\r
 196         int                                                                     audio_s_index_;\r
 197         \r
 198         tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>> video_packet_buffer_;\r
 199         tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>> audio_packet_buffer_;\r
 200         \r
 201         tbb::atomic<size_t>                     buffer_size_;\r
 202 \r
 203         executor executor_;\r
 204 };\r
 205 \r
 206 input::input(const std::wstring& filename) : impl_(new implementation(filename)){}\r
 207 void input::set_loop(bool value){impl_->loop_ = value;}\r
 208 const std::shared_ptr<AVCodecContext>& input::get_video_codec_context() const{return impl_->video_codec_context_;}\r
 209 const std::shared_ptr<AVCodecContext>& input::get_audio_codec_context() const{return impl_->audio_codex_context_;}\r
 210 bool input::is_eof() const{return impl_->is_eof();}\r
 211 aligned_buffer input::get_video_packet(){return impl_->get_video_packet();}\r
 212 aligned_buffer input::get_audio_packet(){return impl_->get_audio_packet();}\r
 213 bool input::seek(unsigned long long frame){return impl_->seek(frame);}\r
 214 }}}