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 #if defined(_MSC_VER)\r
  21 #pragma warning (disable : 4244)\r
  22 #endif\r
  23 \r
  24 #include "../stdafx.h"\r
  25 \r
  26 #include "input.h"\r
  27 #include "../ffmpeg_error.h"\r
  28 #include "../tbb_avcodec.h"\r
  29 \r
  30 #include <core/video_format.h>\r
  31 \r
  32 #include <common/diagnostics/graph.h>\r
  33 #include <common/exception/exceptions.h>\r
  34 #include <common/exception/win32_exception.h>\r
  35 \r
  36 #include <tbb/concurrent_queue.h>\r
  37 #include <tbb/atomic.h>\r
  38 \r
  39 #include <boost/range/algorithm.hpp>\r
  40 #include <boost/thread/condition_variable.hpp>\r
  41 #include <boost/thread/mutex.hpp>\r
  42 #include <boost/thread/thread.hpp>\r
  43 \r
  44 #if defined(_MSC_VER)\r
  45 #pragma warning (push)\r
  46 #pragma warning (disable : 4244)\r
  47 #endif\r
  48 extern "C" \r
  49 {\r
  50         #define __STDC_CONSTANT_MACROS\r
  51         #define __STDC_LIMIT_MACROS\r
  52         #include <libavformat/avformat.h>\r
  53 }\r
  54 #if defined(_MSC_VER)\r
  55 #pragma warning (pop)\r
  56 #endif\r
  57 \r
  58 namespace caspar {\r
  59 \r
  60 static const size_t MAX_BUFFER_COUNT = 100;\r
  61 static const size_t MIN_BUFFER_COUNT = 4;\r
  62 static const size_t MAX_BUFFER_SIZE  = 16 * 1000000;\r
  63         \r
  64 struct input::implementation : boost::noncopyable\r
  65 {               \r
  66         std::shared_ptr<AVFormatContext>                                                        format_context_; // Destroy this last\r
  67         int                                                                                                                     default_stream_index_;\r
  68 \r
  69         safe_ptr<diagnostics::graph>                                                            graph_;\r
  70                 \r
  71         const std::wstring                                                                                      filename_;\r
  72         const bool                                                                                                      loop_;\r
  73         const size_t                                                                                            start_;         \r
  74         const size_t                                                                                            length_;\r
  75         size_t                                                                                                          frame_number_;\r
  76         \r
  77         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>        buffer_;\r
  78         tbb::atomic<size_t>                                                                                     buffer_size_;\r
  79         boost::condition_variable                                                                       buffer_cond_;\r
  80         boost::mutex                                                                                            buffer_mutex_;\r
  81                 \r
  82         boost::thread                                                                                           thread_;\r
  83         tbb::atomic<bool>                                                                                       is_running_;\r
  84 \r
  85         tbb::atomic<size_t>                                                                                     nb_frames_;\r
  86         tbb::atomic<size_t>                                                                                     nb_loops_;\r
  87 \r
  88 public:\r
  89         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, size_t start, size_t length) \r
  90                 : graph_(graph)\r
  91                 , loop_(loop)\r
  92                 , filename_(filename)\r
  93                 , start_(start)\r
  94                 , length_(length)\r
  95                 , frame_number_(0)\r
  96         {                       \r
  97                 is_running_ = true;\r
  98                 nb_frames_      = 0;\r
  99                 nb_loops_       = 0;\r
 100                 \r
 101                 AVFormatContext* weak_format_context_ = nullptr;\r
 102                 THROW_ON_ERROR2(avformat_open_input(&weak_format_context_, narrow(filename).c_str(), nullptr, nullptr), print());\r
 103 \r
 104                 format_context_.reset(weak_format_context_, av_close_input_file);\r
 105 \r
 106                 av_dump_format(weak_format_context_, 0, narrow(filename).c_str(), 0);\r
 107                         \r
 108                 THROW_ON_ERROR2(avformat_find_stream_info(format_context_.get(), nullptr), print());\r
 109                 \r
 110                 default_stream_index_ = THROW_ON_ERROR2(av_find_default_stream_index(format_context_.get()), print());\r
 111 \r
 112                 if(start_ > 0)                  \r
 113                         seek_frame(start_);\r
 114                 \r
 115                 for(int n = 0; n < 16 && !full(); ++n)\r
 116                         read_next_packet();\r
 117                                                 \r
 118                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));        \r
 119                 graph_->set_color("buffer-count", diagnostics::color(0.7f, 0.4f, 0.4f));\r
 120                 graph_->set_color("buffer-size", diagnostics::color(1.0f, 1.0f, 0.0f)); \r
 121 \r
 122                 thread_ = boost::thread([this]{run();});\r
 123         }\r
 124 \r
 125         ~implementation()\r
 126         {\r
 127                 is_running_ = false;\r
 128                 buffer_cond_.notify_all();\r
 129                 thread_.join();\r
 130         }\r
 131                 \r
 132         bool try_pop(std::shared_ptr<AVPacket>& packet)\r
 133         {\r
 134                 const bool result = buffer_.try_pop(packet);\r
 135 \r
 136                 if(result)\r
 137                 {\r
 138                         if(packet)\r
 139                                 buffer_size_ -= packet->size;\r
 140                         buffer_cond_.notify_all();\r
 141                 }\r
 142 \r
 143                 graph_->update_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 144                 graph_->update_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 145 \r
 146                 return result;\r
 147         }\r
 148 \r
 149         size_t nb_frames() const\r
 150         {\r
 151                 return nb_frames_;\r
 152         }\r
 153 \r
 154         size_t nb_loops() const\r
 155         {\r
 156                 return nb_loops_;\r
 157         }\r
 158 \r
 159 private:\r
 160         \r
 161         void run()\r
 162         {               \r
 163                 caspar::win32_exception::install_handler();\r
 164 \r
 165                 try\r
 166                 {\r
 167                         CASPAR_LOG(info) << print() << " Thread Started.";\r
 168 \r
 169                         while(is_running_)\r
 170                         {\r
 171                                 {\r
 172                                         boost::unique_lock<boost::mutex> lock(buffer_mutex_);\r
 173                                         while(full())\r
 174                                                 buffer_cond_.timed_wait(lock, boost::posix_time::millisec(20));\r
 175                                 }\r
 176                                 read_next_packet();                     \r
 177                         }\r
 178 \r
 179                         CASPAR_LOG(info) << print() << " Thread Stopped.";\r
 180                 }\r
 181                 catch(...)\r
 182                 {\r
 183                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 184                         is_running_ = false;\r
 185                 }\r
 186         }\r
 187                         \r
 188         void read_next_packet()\r
 189         {               \r
 190                 int ret = 0;\r
 191 \r
 192                 std::shared_ptr<AVPacket> read_packet(new AVPacket, [](AVPacket* p)\r
 193                 {\r
 194                         av_free_packet(p);\r
 195                         delete p;\r
 196                 });\r
 197                 av_init_packet(read_packet.get());\r
 198 \r
 199                 ret = av_read_frame(format_context_.get(), read_packet.get()); // read_packet is only valid until next call of av_read_frame. Use av_dup_packet to extend its life.     \r
 200                 \r
 201                 if(is_eof(ret))                                                                                                              \r
 202                 {\r
 203                         ++nb_loops_;\r
 204                         frame_number_ = 0;\r
 205 \r
 206                         if(loop_)\r
 207                         {\r
 208                                 int flags = AVSEEK_FLAG_BACKWARD;\r
 209 \r
 210                                 int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 211                                 if(vid_stream_index >= 0)\r
 212                                 {\r
 213                                         auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;\r
 214                                         if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)\r
 215                                                 flags |= AVSEEK_FLAG_BYTE;\r
 216                                 }\r
 217 \r
 218                                 seek_frame(start_, flags);\r
 219                                 graph_->add_tag("seek");                \r
 220                                 CASPAR_LOG(trace) << print() << " Looping.";                    \r
 221                         }       \r
 222                         else\r
 223                         {\r
 224                                 is_running_ = false;\r
 225                                 CASPAR_LOG(trace) << print() << " Stopping.";\r
 226                         }\r
 227                 }\r
 228                 else\r
 229                 {               \r
 230                         THROW_ON_ERROR(ret, print(), "av_read_frame");\r
 231 \r
 232                         if(read_packet->stream_index == default_stream_index_)\r
 233                         {\r
 234                                 if(nb_loops_ == 0)\r
 235                                         ++nb_frames_;\r
 236                                 ++frame_number_;\r
 237                         }\r
 238 \r
 239                         THROW_ON_ERROR2(av_dup_packet(read_packet.get()), print());\r
 240                                 \r
 241                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.\r
 242                         auto size = read_packet->size;\r
 243                         auto data = read_packet->data;\r
 244 \r
 245                         read_packet = std::shared_ptr<AVPacket>(read_packet.get(), [=](AVPacket*)\r
 246                         {\r
 247                                 read_packet->size = size;\r
 248                                 read_packet->data = data;\r
 249                         });\r
 250 \r
 251                         buffer_.try_push(read_packet);\r
 252                         buffer_size_ += read_packet->size;\r
 253                                 \r
 254                         graph_->update_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 255                         graph_->update_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 256                 }                       \r
 257         }\r
 258 \r
 259         bool full() const\r
 260         {\r
 261                 return is_running_ && (buffer_size_ > MAX_BUFFER_SIZE || buffer_.size() > MAX_BUFFER_COUNT) && buffer_.size() > MIN_BUFFER_COUNT;\r
 262         }\r
 263 \r
 264         void seek_frame(int64_t frame, int flags = 0)\r
 265         {                                                       \r
 266                 THROW_ON_ERROR2(av_seek_frame(format_context_.get(), default_stream_index_, frame, flags), print());            \r
 267                 buffer_.push(nullptr);\r
 268         }               \r
 269 \r
 270         bool is_eof(int ret)\r
 271         {\r
 272                 if(ret == AVERROR(EIO))\r
 273                         CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. " << nb_frames_;\r
 274                 if(ret == AVERROR_EOF)\r
 275                         CASPAR_LOG(trace) << print() << " Received EOF. " << nb_frames_;\r
 276 \r
 277                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 278         }\r
 279         \r
 280         std::wstring print() const\r
 281         {\r
 282                 return L"ffmpeg_input[" + filename_ + L")]";\r
 283         }\r
 284 };\r
 285 \r
 286 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, size_t start, size_t length) \r
 287         : impl_(new implementation(graph, filename, loop, start, length)){}\r
 288 bool input::eof() const {return !impl_->is_running_;}\r
 289 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}\r
 290 safe_ptr<AVFormatContext> input::context(){return make_safe(impl_->format_context_);}\r
 291 size_t input::nb_frames() const {return impl_->nb_frames();}\r
 292 size_t input::nb_loops() const {return impl_->nb_loops();}\r
 293 }