git.sesse.net Git - casparcg/blob - modules/ffmpeg/producer/input/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 \r
  28 #include "../util/util.h"\r
  29 #include "../../ffmpeg_error.h"\r
  30 \r
  31 #include <core/video_format.h>\r
  32 \r
  33 #include <common/diagnostics/graph.h>\r
  34 #include <common/exception/exceptions.h>\r
  35 #include <common/exception/win32_exception.h>\r
  36 \r
  37 #include <tbb/concurrent_queue.h>\r
  38 #include <tbb/atomic.h>\r
  39 #include <tbb/recursive_mutex.h>\r
  40 \r
  41 #include <boost/range/algorithm.hpp>\r
  42 #include <boost/thread/condition_variable.hpp>\r
  43 #include <boost/thread/mutex.hpp>\r
  44 #include <boost/thread/thread.hpp>\r
  45 \r
  46 #if defined(_MSC_VER)\r
  47 #pragma warning (push)\r
  48 #pragma warning (disable : 4244)\r
  49 #endif\r
  50 extern "C" \r
  51 {\r
  52         #define __STDC_CONSTANT_MACROS\r
  53         #define __STDC_LIMIT_MACROS\r
  54         #include <libavformat/avformat.h>\r
  55 }\r
  56 #if defined(_MSC_VER)\r
  57 #pragma warning (pop)\r
  58 #endif\r
  59 \r
  60 namespace caspar { namespace ffmpeg {\r
  61 \r
  62 static const size_t MAX_BUFFER_COUNT = 100;\r
  63 static const size_t MIN_BUFFER_COUNT = 4;\r
  64 static const size_t MAX_BUFFER_SIZE  = 16 * 1000000;\r
  65         \r
  66 struct input::implementation : boost::noncopyable\r
  67 {               \r
  68         safe_ptr<diagnostics::graph>                                                            graph_;\r
  69 \r
  70         const safe_ptr<AVFormatContext>                                                         format_context_; // Destroy this last\r
  71         const int                                                                                                       default_stream_index_;\r
  72                         \r
  73         const std::wstring                                                                                      filename_;\r
  74         tbb::atomic<bool>                                                                                       loop_;\r
  75         const size_t                                                                                            start_;         \r
  76         const size_t                                                                                            length_;\r
  77         size_t                                                                                                          frame_number_;\r
  78         \r
  79         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>        buffer_;\r
  80         tbb::atomic<size_t>                                                                                     buffer_size_;\r
  81         boost::condition_variable                                                                       buffer_cond_;\r
  82         boost::mutex                                                                                            buffer_mutex_;\r
  83                 \r
  84         tbb::atomic<size_t>                                                                                     nb_frames_;\r
  85         tbb::atomic<size_t>                                                                                     nb_loops_;\r
  86 \r
  87         boost::thread                                                                                           thread_;\r
  88         tbb::atomic<bool>                                                                                       is_running_;\r
  89 \r
  90         tbb::recursive_mutex                                                                            mutex_;\r
  91 \r
  92         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, size_t start, size_t length) \r
  93                 : graph_(graph)\r
  94                 , format_context_(open_input(filename))         \r
  95                 , default_stream_index_(av_find_default_stream_index(format_context_.get()))\r
  96                 , filename_(filename)\r
  97                 , start_(start)\r
  98                 , length_(length)\r
  99                 , frame_number_(0)\r
 100         {               \r
 101                 loop_                   = loop;\r
 102                 buffer_size_    = 0;\r
 103                 nb_frames_              = 0;\r
 104                 nb_loops_               = 0;\r
 105 \r
 106                 buffer_size_    = 0;\r
 107                 nb_frames_              = 0;\r
 108                 nb_loops_               = 0;\r
 109 \r
 110                 if(start_ > 0)                  \r
 111                         do_seek(start_);\r
 112                                                                 \r
 113                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));        \r
 114                 graph_->set_color("buffer-count", diagnostics::color(0.7f, 0.4f, 0.4f));\r
 115                 graph_->set_color("buffer-size", diagnostics::color(1.0f, 1.0f, 0.0f)); \r
 116                 \r
 117                 is_running_ = true;\r
 118                 thread_ = boost::thread([this]{run();});\r
 119 \r
 120                 CASPAR_LOG(info) << print() << L" Initialized.";\r
 121         }\r
 122 \r
 123         ~implementation()\r
 124         {\r
 125                 is_running_ = false;\r
 126                 buffer_cond_.notify_all();\r
 127                 thread_.join();\r
 128         }\r
 129                 \r
 130         bool try_pop(std::shared_ptr<AVPacket>& packet)\r
 131         {\r
 132                 const bool result = buffer_.try_pop(packet);\r
 133 \r
 134                 if(result)\r
 135                 {\r
 136                         if(packet)\r
 137                                 buffer_size_ -= packet->size;\r
 138                         buffer_cond_.notify_all();\r
 139                 }\r
 140 \r
 141                 graph_->update_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 142                 graph_->update_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 143 \r
 144                 return result;\r
 145         }\r
 146                         \r
 147         void run()\r
 148         {               \r
 149                 caspar::win32_exception::install_handler();\r
 150 \r
 151                 try\r
 152                 {\r
 153                         CASPAR_LOG(info) << print() << " Thread Started.";\r
 154                         \r
 155                         CASPAR_ASSERT(nb_frames_ < 1000);\r
 156 \r
 157                         while(is_running_)\r
 158                         {\r
 159                                 {\r
 160                                         boost::unique_lock<boost::mutex> lock(buffer_mutex_);\r
 161                                         while(full())\r
 162                                                 buffer_cond_.timed_wait(lock, boost::posix_time::millisec(20));\r
 163                                 }\r
 164                                 read_next_packet();                     \r
 165                         }\r
 166 \r
 167                         CASPAR_LOG(info) << print() << " Thread Stopped.";\r
 168                 }\r
 169                 catch(...)\r
 170                 {\r
 171                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 172                         is_running_ = false;\r
 173                 }\r
 174         }\r
 175                         \r
 176         void read_next_packet()\r
 177         {               \r
 178                 tbb::recursive_mutex::scoped_lock lock(mutex_);\r
 179 \r
 180                 auto packet = create_packet();\r
 181                 auto ret        = av_read_frame(format_context_.get(), packet.get()); // packet is only valid until next call of av_read_frame. Use av_dup_packet to extend its life.   \r
 182                 \r
 183                 if(is_eof(ret))                                                                                                              \r
 184                 {\r
 185                         ++nb_loops_;\r
 186                         frame_number_ = 0;\r
 187 \r
 188                         if(loop_)\r
 189                         {\r
 190                                 do_seek(start_);\r
 191                                 graph_->add_tag("seek");                \r
 192                                 CASPAR_LOG(debug) << print() << " Looping.";                    \r
 193                         }       \r
 194                         else\r
 195                         {\r
 196                                 is_running_ = false;\r
 197                                 CASPAR_LOG(debug) << print() << " Stopping.";\r
 198                         }\r
 199                 }\r
 200                 else\r
 201                 {               \r
 202                         THROW_ON_ERROR(ret, "av_read_frame", print());\r
 203 \r
 204                         if(packet->stream_index == default_stream_index_)\r
 205                         {\r
 206                                 if(nb_loops_ == 0)\r
 207                                         ++nb_frames_;\r
 208                                 ++frame_number_;\r
 209                         }\r
 210 \r
 211                         THROW_ON_ERROR2(av_dup_packet(packet.get()), print());\r
 212                                 \r
 213                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.\r
 214                         auto size = packet->size;\r
 215                         auto data = packet->data;\r
 216 \r
 217                         packet = safe_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)\r
 218                         {\r
 219                                 packet->size = size;\r
 220                                 packet->data = data;\r
 221                         });\r
 222 \r
 223                         buffer_.try_push(packet);\r
 224                         buffer_size_ += packet->size;\r
 225                                 \r
 226                         graph_->update_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 227                         graph_->update_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 228                 }                       \r
 229         }\r
 230 \r
 231         bool full() const\r
 232         {\r
 233                 return is_running_ && (buffer_size_ > MAX_BUFFER_SIZE || buffer_.size() > MAX_BUFFER_COUNT) && buffer_.size() > MIN_BUFFER_COUNT;\r
 234         }\r
 235         \r
 236         void do_seek(int64_t target)\r
 237         {       \r
 238                 CASPAR_LOG(debug) << print() << " Seeking: " << target;\r
 239 \r
 240                 int flags = AVSEEK_FLAG_FRAME;\r
 241                 if(target == 0)\r
 242                 {\r
 243                         // Fix VP6 seeking\r
 244                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 245                         if(vid_stream_index >= 0)\r
 246                         {\r
 247                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;\r
 248                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)\r
 249                                         flags = AVSEEK_FLAG_BYTE;\r
 250                         }\r
 251                 }\r
 252                 \r
 253                 auto time_base = format_context_->streams[default_stream_index_]->time_base;\r
 254                 target = (target*time_base.den)/time_base.num;\r
 255                 auto fixed_time_base = fix_time_base(time_base);\r
 256                 target = (target * fixed_time_base.num) / fixed_time_base.den;\r
 257 \r
 258                 THROW_ON_ERROR2(avformat_seek_file(format_context_.get(), default_stream_index_, std::numeric_limits<int64_t>::min(), target, std::numeric_limits<int64_t>::max(), 0), print());                \r
 259 \r
 260                 buffer_.push(flush_packet());\r
 261         }       \r
 262 \r
 263         void seek(int64_t target)\r
 264         {\r
 265                 tbb::recursive_mutex::scoped_lock lock(mutex_);\r
 266 \r
 267                 std::shared_ptr<AVPacket> packet;\r
 268                 while(try_pop(packet))\r
 269                 {\r
 270                 }\r
 271 \r
 272                 do_seek(target);\r
 273         }\r
 274 \r
 275         bool is_eof(int ret)\r
 276         {\r
 277                 if(ret == AVERROR(EIO))\r
 278                         CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. " << nb_frames_;\r
 279                 if(ret == AVERROR_EOF)\r
 280                         CASPAR_LOG(debug) << print() << " Received EOF. " << nb_frames_;\r
 281 \r
 282                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 283         }\r
 284         \r
 285         std::wstring print() const\r
 286         {\r
 287                 return L"ffmpeg_input[" + filename_ + L")]";\r
 288         }\r
 289 };\r
 290 \r
 291 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, size_t start, size_t length) \r
 292         : impl_(new implementation(graph, filename, loop, start, length)){}\r
 293 bool input::eof() const {return !impl_->is_running_;}\r
 294 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}\r
 295 safe_ptr<AVFormatContext> input::context(){return impl_->format_context_;}\r
 296 size_t input::nb_frames() const {return impl_->nb_frames_;}\r
 297 size_t input::nb_loops() const {return impl_->nb_loops_;}\r
 298 void input::loop(bool value){impl_->loop_ = value;}\r
 299 bool input::loop() const{return impl_->loop_;}\r
 300 void input::seek(int64_t target){impl_->seek(target);}\r
 301 }}\r