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         tbb::atomic<bool>                                                                                       is_eof_;\r
  90 \r
  91         tbb::recursive_mutex                                                                            mutex_;\r
  92 \r
  93         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, size_t start, size_t length) \r
  94                 : graph_(graph)\r
  95                 , format_context_(open_input(filename))         \r
  96                 , default_stream_index_(av_find_default_stream_index(format_context_.get()))\r
  97                 , filename_(filename)\r
  98                 , start_(start)\r
  99                 , length_(length)\r
 100                 , frame_number_(0)\r
 101         {               \r
 102                 is_eof_                 = false;\r
 103                 loop_                   = loop;\r
 104                 buffer_size_    = 0;\r
 105                 nb_frames_              = 0;\r
 106                 nb_loops_               = 0;\r
 107 \r
 108                 buffer_size_    = 0;\r
 109                 nb_frames_              = 0;\r
 110                 nb_loops_               = 0;\r
 111 \r
 112                 if(start_ > 0)                  \r
 113                         do_seek(start_);\r
 114                                                                 \r
 115                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));        \r
 116                 graph_->set_color("buffer-count", diagnostics::color(0.7f, 0.4f, 0.4f));\r
 117                 graph_->set_color("buffer-size", diagnostics::color(1.0f, 1.0f, 0.0f)); \r
 118                 \r
 119                 is_running_ = true;\r
 120                 thread_ = boost::thread([this]{run();});\r
 121 \r
 122                 CASPAR_LOG(info) << print() << L" Initialized.";\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         void run()\r
 150         {               \r
 151                 caspar::win32_exception::install_handler();\r
 152 \r
 153                 try\r
 154                 {\r
 155                         CASPAR_LOG(info) << print() << " Thread Started.";\r
 156                         \r
 157                         CASPAR_ASSERT(nb_frames_ < 1000);\r
 158 \r
 159                         while(is_running_)\r
 160                         {\r
 161                                 {\r
 162                                         boost::unique_lock<boost::mutex> lock(buffer_mutex_);\r
 163                                         while(full())\r
 164                                                 buffer_cond_.timed_wait(lock, boost::posix_time::millisec(20));\r
 165                                 }\r
 166                                 read_next_packet();                     \r
 167                         }\r
 168 \r
 169                         CASPAR_LOG(info) << print() << " Thread Stopped.";\r
 170                 }\r
 171                 catch(...)\r
 172                 {\r
 173                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 174                         is_running_ = false;\r
 175                 }\r
 176         }\r
 177                         \r
 178         void read_next_packet()\r
 179         {               \r
 180                 tbb::recursive_mutex::scoped_lock lock(mutex_);\r
 181 \r
 182                 auto packet = create_packet();\r
 183                 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
 184                 \r
 185                 if(is_eof(ret))                                                                                                              \r
 186                 {\r
 187                         ++nb_loops_;\r
 188                         frame_number_   = 0;\r
 189                         is_eof_                 = true;\r
 190 \r
 191                         if(loop_)\r
 192                         {\r
 193                                 do_seek(start_);\r
 194                                 graph_->add_tag("seek");                \r
 195                                 CASPAR_LOG(debug) << print() << " Looping.";                    \r
 196                         }                                       \r
 197                 }\r
 198                 else\r
 199                 {               \r
 200                         THROW_ON_ERROR(ret, "av_read_frame", print());\r
 201 \r
 202                         if(packet->stream_index == default_stream_index_)\r
 203                         {\r
 204                                 if(nb_loops_ == 0)\r
 205                                         ++nb_frames_;\r
 206                                 ++frame_number_;\r
 207                         }\r
 208 \r
 209                         THROW_ON_ERROR2(av_dup_packet(packet.get()), print());\r
 210                                 \r
 211                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.\r
 212                         auto size = packet->size;\r
 213                         auto data = packet->data;\r
 214                         \r
 215                         packet = safe_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)\r
 216                         {\r
 217                                 packet->size = size;\r
 218                                 packet->data = data;\r
 219                         });\r
 220 \r
 221                         buffer_.try_push(packet);\r
 222                         buffer_size_ += packet->size;\r
 223                                 \r
 224                         graph_->update_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 225                         graph_->update_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 226                 }                       \r
 227         }\r
 228 \r
 229         bool full() const\r
 230         {\r
 231                 return is_running_ && (is_eof_ || (buffer_size_ > MAX_BUFFER_SIZE || buffer_.size() > MAX_BUFFER_COUNT) && buffer_.size() > MIN_BUFFER_COUNT);\r
 232         }\r
 233         \r
 234         void do_seek(const int64_t target)\r
 235         {       \r
 236                 CASPAR_LOG(debug) << print() << " Seeking: " << target;\r
 237 \r
 238                 int flags = AVSEEK_FLAG_FRAME;\r
 239                 if(target == 0)\r
 240                 {\r
 241                         // Fix VP6 seeking\r
 242                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 243                         if(vid_stream_index >= 0)\r
 244                         {\r
 245                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;\r
 246                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)\r
 247                                         flags = AVSEEK_FLAG_BYTE;\r
 248                         }\r
 249                 }\r
 250                 \r
 251                 auto time_base = format_context_->streams[default_stream_index_]->time_base;\r
 252                 auto fixed_target = (target*time_base.den)/time_base.num;\r
 253                 auto fixed_time_base = fix_time_base(time_base);\r
 254                 fixed_target = (fixed_target * fixed_time_base.num) / fixed_time_base.den;\r
 255 \r
 256                 THROW_ON_ERROR2(avformat_seek_file(format_context_.get(), default_stream_index_, std::numeric_limits<int64_t>::min(), fixed_target, std::numeric_limits<int64_t>::max(), 0), print());          \r
 257 \r
 258                 is_eof_ = false;\r
 259                 buffer_cond_.notify_all();\r
 260 \r
 261                 auto flush_packet       = create_packet();\r
 262                 flush_packet->data      = nullptr;\r
 263                 flush_packet->size      = 0;\r
 264                 flush_packet->pos       = target;\r
 265 \r
 266                 buffer_.push(flush_packet);\r
 267         }       \r
 268 \r
 269         void seek(int64_t target)\r
 270         {\r
 271                 tbb::recursive_mutex::scoped_lock lock(mutex_);\r
 272 \r
 273                 std::shared_ptr<AVPacket> packet;\r
 274                 while(try_pop(packet))\r
 275                 {\r
 276                 }\r
 277 \r
 278                 do_seek(target);\r
 279         }\r
 280 \r
 281         bool is_eof(int ret)\r
 282         {\r
 283                 if(ret == AVERROR(EIO))\r
 284                         CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. " << nb_frames_;\r
 285                 if(ret == AVERROR_EOF)\r
 286                         CASPAR_LOG(debug) << print() << " Received EOF. " << nb_frames_;\r
 287 \r
 288                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 289         }\r
 290         \r
 291         std::wstring print() const\r
 292         {\r
 293                 return L"ffmpeg_input[" + filename_ + L")]";\r
 294         }\r
 295 };\r
 296 \r
 297 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, size_t start, size_t length) \r
 298         : impl_(new implementation(graph, filename, loop, start, length)){}\r
 299 bool input::eof() const {return impl_->is_eof_;}\r
 300 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}\r
 301 safe_ptr<AVFormatContext> input::context(){return impl_->format_context_;}\r
 302 size_t input::nb_frames() const {return impl_->nb_frames_;}\r
 303 size_t input::nb_loops() const {return impl_->nb_loops_;}\r
 304 void input::loop(bool value){impl_->loop_ = value;}\r
 305 bool input::loop() const{return impl_->loop_;}\r
 306 void input::seek(int64_t target){impl_->seek(target);}\r
 307 }}\r