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

   1 #include "..\stdafx.h"\r
   2 \r
   3 #include "input.h"\r
   4 \r
   5 #include <core/video_format.h>\r
   6 \r
   7 #include <common/concurrency/executor.h>\r
   8 #include <common/diagnostics/graph.h>\r
   9 \r
  10 #include <tbb/concurrent_queue.h>\r
  11 #include <tbb/queuing_mutex.h>\r
  12 \r
  13 #include <boost/exception/error_info.hpp>\r
  14 #include <boost/thread/once.hpp>\r
  15 #include <boost/thread/thread.hpp>\r
  16 \r
  17 #include <errno.h>\r
  18 #include <system_error>\r
  19                 \r
  20 #if defined(_MSC_VER)\r
  21 #pragma warning (disable : 4244)\r
  22 #endif\r
  23 \r
  24 extern "C" \r
  25 {\r
  26         #define __STDC_CONSTANT_MACROS\r
  27         #define __STDC_LIMIT_MACROS\r
  28         #include <libavformat/avformat.h>\r
  29 }\r
  30 \r
  31 namespace caspar {\r
  32                 \r
  33 struct input::implementation : boost::noncopyable\r
  34 {               \r
  35         static const size_t PACKET_BUFFER_COUNT = 50;\r
  36 \r
  37         safe_ptr<diagnostics::graph> graph_;\r
  38 \r
  39         std::shared_ptr<AVFormatContext> format_context_;       // Destroy this last\r
  40 \r
  41         std::shared_ptr<AVCodecContext> video_codec_context_;\r
  42         std::shared_ptr<AVCodecContext> audio_codex_context_;\r
  43         \r
  44         const std::wstring filename_;\r
  45 \r
  46         bool loop_;\r
  47         int video_s_index_;\r
  48         int     audio_s_index_;\r
  49                 \r
  50         tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>> video_packet_buffer_;\r
  51         tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>> audio_packet_buffer_;\r
  52 \r
  53         boost::condition_variable cond_;\r
  54         boost::mutex mutex_;\r
  55         \r
  56         executor executor_;\r
  57 public:\r
  58         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop) \r
  59                 : graph_(graph)\r
  60                 , loop_(loop)\r
  61                 , video_s_index_(-1)\r
  62                 , audio_s_index_(-1)\r
  63                 , filename_(filename)\r
  64                 , executor_(print())\r
  65         {                       \r
  66                 graph_->set_color("input-buffer", diagnostics::color(1.0f, 1.0f, 0.0f));\r
  67                 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));        \r
  68 \r
  69                 int errn;\r
  70                 AVFormatContext* weak_format_context_;\r
  71                 if((errn = -av_open_input_file(&weak_format_context_, narrow(filename).c_str(), nullptr, 0, nullptr)) > 0)\r
  72                         BOOST_THROW_EXCEPTION(\r
  73                                 file_read_error() << \r
  74                                 source_info(narrow(print())) << \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                                 source_info(narrow(print())) << \r
  86                                 boost::errinfo_api_function("av_find_stream_info") <<\r
  87                                 msg_info("No stream found.") << \r
  88                                 boost::errinfo_errno(errn));\r
  89 \r
  90                 video_codec_context_ = open_stream(CODEC_TYPE_VIDEO, video_s_index_);\r
  91                 if(!video_codec_context_)\r
  92                         CASPAR_LOG(warning) << print() << " Could not open any video stream.";\r
  93                 else\r
  94                         fix_time_base(video_codec_context_.get());\r
  95                 \r
  96                 audio_codex_context_ = open_stream(CODEC_TYPE_AUDIO, audio_s_index_);\r
  97                 if(!audio_codex_context_)\r
  98                         CASPAR_LOG(warning) << print() << " Could not open any audio stream.";\r
  99                 else\r
 100                         fix_time_base(video_codec_context_.get());\r
 101 \r
 102                 if(!video_codec_context_ && !audio_codex_context_)\r
 103                         BOOST_THROW_EXCEPTION(\r
 104                                 file_read_error() << \r
 105                                 source_info(narrow(print())) << \r
 106                                 msg_info("No video or audio codec context found."));            \r
 107                         \r
 108                 executor_.start();\r
 109                 executor_.begin_invoke([this]{read_file();});\r
 110                 CASPAR_LOG(info) << print() << " Started.";\r
 111         }\r
 112 \r
 113         ~implementation()\r
 114         {\r
 115                 executor_.clear();\r
 116                 executor_.stop();\r
 117                 cond_.notify_all();\r
 118                 CASPAR_LOG(info) << print() << " Stopped.";\r
 119         }\r
 120                         \r
 121         void fix_time_base(AVCodecContext* context) // Some files give an invalid numerator, try to fix it.\r
 122         {\r
 123                 if(context && context->time_base.num == 1)\r
 124                         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
 125         }\r
 126 \r
 127         std::shared_ptr<AVCodecContext> open_stream(int codec_type, int& s_index)\r
 128         {               \r
 129                 AVStream** streams_end = format_context_->streams+format_context_->nb_streams;\r
 130                 AVStream** stream = std::find_if(format_context_->streams, streams_end, \r
 131                         [&](AVStream* stream) { return stream != nullptr && stream->codec->codec_type == codec_type ;});\r
 132                 \r
 133                 if(stream == streams_end) \r
 134                         return nullptr;\r
 135 \r
 136                 s_index = (*stream)->index;\r
 137                 \r
 138                 auto codec = avcodec_find_decoder((*stream)->codec->codec_id);                  \r
 139                 if(codec == nullptr)\r
 140                         return nullptr;\r
 141                         \r
 142                 if((-avcodec_open((*stream)->codec, codec)) > 0)                \r
 143                         return nullptr;\r
 144 \r
 145                 return std::shared_ptr<AVCodecContext>((*stream)->codec, avcodec_close);\r
 146         }\r
 147                 \r
 148         void read_file()\r
 149         {                                       \r
 150                 AVPacket tmp_packet;\r
 151                 safe_ptr<AVPacket> read_packet(&tmp_packet, av_free_packet);    \r
 152 \r
 153                 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
 154                 {\r
 155                         auto packet = std::make_shared<aligned_buffer>(read_packet->data, read_packet->data + read_packet->size);\r
 156                         if(read_packet->stream_index == video_s_index_)                 \r
 157                                 video_packet_buffer_.try_push(std::move(packet));       \r
 158                         else if(read_packet->stream_index == audio_s_index_)    \r
 159                                 audio_packet_buffer_.try_push(std::move(packet));               \r
 160                 }\r
 161                 else if(!loop_ || !seek_frame(0, AVSEEK_FLAG_BACKWARD)) // TODO: av_seek_frame does not work for all formats\r
 162                         executor_.stop();\r
 163                 else\r
 164                         graph_->add_tag("seek");                \r
 165                                         \r
 166                 graph_->update_value("input-buffer", static_cast<float>(video_packet_buffer_.size())/static_cast<float>(PACKET_BUFFER_COUNT));          \r
 167                 \r
 168                 executor_.begin_invoke([this]{read_file();});           \r
 169                 boost::unique_lock<boost::mutex> lock(mutex_);\r
 170                 while(executor_.is_running() && audio_packet_buffer_.size() > PACKET_BUFFER_COUNT && video_packet_buffer_.size() > PACKET_BUFFER_COUNT)\r
 171                         cond_.wait(lock);               \r
 172         }\r
 173         \r
 174         bool seek_frame(int64_t seek_target, int flags = 0)\r
 175         {  \r
 176                 static const AVRational TIME_BASE_Q = {1, AV_TIME_BASE};\r
 177                 \r
 178                 int stream_index = std::max(video_s_index_, audio_s_index_);\r
 179                 seek_target *= AV_TIME_BASE;\r
 180 \r
 181                 if(stream_index >= 0)     \r
 182                         seek_target = av_rescale_q(seek_target, TIME_BASE_Q, format_context_->streams[stream_index]->time_base);\r
 183           \r
 184                 bool result = av_seek_frame(format_context_.get(), stream_index, seek_target, flags) >= 0;\r
 185                 if(!result)\r
 186                         CASPAR_LOG(warning) << print() << " Failed to seek frame.";\r
 187                 return result;\r
 188         }\r
 189                 \r
 190         aligned_buffer get_video_packet()\r
 191         {\r
 192                 return get_packet(video_packet_buffer_);\r
 193         }\r
 194 \r
 195         aligned_buffer get_audio_packet()\r
 196         {\r
 197                 return get_packet(audio_packet_buffer_);\r
 198         }\r
 199         \r
 200         aligned_buffer get_packet(tbb::concurrent_bounded_queue<std::shared_ptr<aligned_buffer>>& buffer)\r
 201         {\r
 202                 cond_.notify_all();\r
 203                 std::shared_ptr<aligned_buffer> packet;\r
 204                 return buffer.try_pop(packet) ? std::move(*packet) : aligned_buffer();\r
 205         }\r
 206 \r
 207         bool is_eof() const\r
 208         {\r
 209                 return !executor_.is_running() && video_packet_buffer_.empty() && audio_packet_buffer_.empty();\r
 210         }\r
 211                 \r
 212         double fps() const\r
 213         {\r
 214                 return static_cast<double>(video_codec_context_->time_base.den) / static_cast<double>(video_codec_context_->time_base.num);\r
 215         }\r
 216 \r
 217         std::wstring print() const\r
 218         {\r
 219                 return L"ffmpeg_input";\r
 220         }\r
 221 };\r
 222 \r
 223 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop) : impl_(new implementation(graph, filename, loop)){}\r
 224 const std::shared_ptr<AVCodecContext>& input::get_video_codec_context() const{return impl_->video_codec_context_;}\r
 225 const std::shared_ptr<AVCodecContext>& input::get_audio_codec_context() const{return impl_->audio_codex_context_;}\r
 226 bool input::is_eof() const{return impl_->is_eof();}\r
 227 aligned_buffer input::get_video_packet(){return impl_->get_video_packet();}\r
 228 aligned_buffer input::get_audio_packet(){return impl_->get_audio_packet();}\r
 229 double input::fps() const { return impl_->fps(); }\r
 230 }