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

   1 /*\r
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>\r
   3 *\r
   4 * This file is part of CasparCG (www.casparcg.com).\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 * Author: Robert Nagy, ronag89@gmail.com\r
  20 */\r
  21 \r
  22 #include "../../stdafx.h"\r
  23 \r
  24 #include "input.h"\r
  25 \r
  26 #include "../util/util.h"\r
  27 #include "../../ffmpeg_error.h"\r
  28 \r
  29 #include <core/video_format.h>\r
  30 \r
  31 #include <common/diagnostics/graph.h>\r
  32 #include <common/exception/exceptions.h>\r
  33 #include <common/exception/win32_exception.h>\r
  34 \r
  35 #include <tbb/concurrent_queue.h>\r
  36 #include <tbb/atomic.h>\r
  37 #include <tbb/recursive_mutex.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 { namespace ffmpeg {\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         safe_ptr<diagnostics::graph>                                                            graph_;\r
  67 \r
  68         const safe_ptr<AVFormatContext>                                                         format_context_; // Destroy this last\r
  69         const int                                                                                                       default_stream_index_;\r
  70                         \r
  71         const std::wstring                                                                                      filename_;\r
  72         tbb::atomic<bool>                                                                                       loop_;\r
  73         const uint64_t                                                                                          start_;         \r
  74         const uint64_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         tbb::atomic<bool>                                                                                       is_eof_;\r
  85 \r
  86         tbb::recursive_mutex                                                                            mutex_;\r
  87 \r
  88         explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int64_t start, int64_t length) \r
  89                 : graph_(graph)\r
  90                 , format_context_(open_input(filename))         \r
  91                 , default_stream_index_(av_find_default_stream_index(format_context_.get()))\r
  92                 , filename_(filename)\r
  93                 , start_(start)\r
  94                 , length_(length)\r
  95                 , frame_number_(0)\r
  96         {               \r
  97                 is_eof_                 = false;\r
  98                 loop_                   = loop;\r
  99                 buffer_size_    = 0;\r
 100 \r
 101                 if(start_ > 0)                  \r
 102                         do_seek(start_);\r
 103                                                                 \r
 104                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));        \r
 105                 graph_->set_color("buffer-count", diagnostics::color(0.7f, 0.4f, 0.4f));\r
 106                 graph_->set_color("buffer-size", diagnostics::color(1.0f, 1.0f, 0.0f)); \r
 107                 \r
 108                 is_running_ = true;\r
 109                 thread_ = boost::thread([this]{run();});\r
 110 \r
 111                 CASPAR_LOG(info) << print() << L" Initialized.";\r
 112         }\r
 113 \r
 114         ~implementation()\r
 115         {\r
 116                 is_running_ = false;\r
 117                 buffer_cond_.notify_all();\r
 118                 thread_.join();\r
 119         }\r
 120                 \r
 121         bool try_pop(std::shared_ptr<AVPacket>& packet)\r
 122         {\r
 123                 const bool result = buffer_.try_pop(packet);\r
 124 \r
 125                 if(result)\r
 126                 {\r
 127                         if(packet)\r
 128                                 buffer_size_ -= packet->size;\r
 129                         buffer_cond_.notify_all();\r
 130                 }\r
 131 \r
 132                 graph_->update_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 133                 graph_->update_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 134 \r
 135                 return result;\r
 136         }\r
 137                         \r
 138         void run()\r
 139         {               \r
 140                 caspar::win32_exception::install_handler();\r
 141 \r
 142                 try\r
 143                 {\r
 144                         CASPAR_LOG(info) << print() << " Thread Started.";\r
 145 \r
 146                         while(is_running_)\r
 147                         {\r
 148                                 {\r
 149                                         boost::unique_lock<boost::mutex> lock(buffer_mutex_);\r
 150                                         while(full())\r
 151                                                 buffer_cond_.timed_wait(lock, boost::posix_time::millisec(20));\r
 152                                 }\r
 153                                 read_next_packet();                     \r
 154                         }\r
 155 \r
 156                         CASPAR_LOG(info) << print() << " Thread Stopped.";\r
 157                 }\r
 158                 catch(...)\r
 159                 {\r
 160                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 161                         is_running_ = false;\r
 162                 }\r
 163         }\r
 164                         \r
 165         void read_next_packet()\r
 166         {               \r
 167                 tbb::recursive_mutex::scoped_lock lock(mutex_);\r
 168 \r
 169                 auto packet = create_packet();\r
 170                 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
 171                 \r
 172                 if(is_eof(ret))                                                                                                              \r
 173                 {\r
 174                         frame_number_   = 0;\r
 175                         is_eof_                 = true;\r
 176 \r
 177                         if(loop_)\r
 178                         {\r
 179                                 do_seek(start_);\r
 180                                 graph_->add_tag("seek");                \r
 181                                 CASPAR_LOG(trace) << print() << " Looping.";                    \r
 182                         }                                       \r
 183                 }\r
 184                 else\r
 185                 {               \r
 186                         THROW_ON_ERROR(ret, "av_read_frame", print());\r
 187 \r
 188                         if(packet->stream_index == default_stream_index_)\r
 189                                 ++frame_number_;\r
 190 \r
 191                         THROW_ON_ERROR2(av_dup_packet(packet.get()), print());\r
 192                                 \r
 193                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.\r
 194                         auto size = packet->size;\r
 195                         auto data = packet->data;\r
 196                         \r
 197                         packet = safe_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)\r
 198                         {\r
 199                                 packet->size = size;\r
 200                                 packet->data = data;\r
 201                         });\r
 202 \r
 203                         buffer_.try_push(packet);\r
 204                         buffer_size_ += packet->size;\r
 205                                 \r
 206                         graph_->update_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 207                         graph_->update_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 208                 }                       \r
 209         }\r
 210 \r
 211         bool full() const\r
 212         {\r
 213                 return is_running_ && (is_eof_ || (buffer_size_ > MAX_BUFFER_SIZE || buffer_.size() > MAX_BUFFER_COUNT) && buffer_.size() > MIN_BUFFER_COUNT);\r
 214         }\r
 215         \r
 216         void do_seek(const int64_t target)\r
 217         {       \r
 218                 CASPAR_LOG(debug) << print() << " Seeking: " << target;\r
 219 \r
 220                 int flags = AVSEEK_FLAG_FRAME;\r
 221                 if(target == 0)\r
 222                 {\r
 223                         // Fix VP6 seeking\r
 224                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 225                         if(vid_stream_index >= 0)\r
 226                         {\r
 227                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;\r
 228                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)\r
 229                                         flags = AVSEEK_FLAG_BYTE;\r
 230                         }\r
 231                 }\r
 232                 \r
 233                 auto stream = format_context_->streams[default_stream_index_];\r
 234                 auto codec  = stream->codec;\r
 235                 auto fixed_target = (target*stream->time_base.den*codec->time_base.num)/(stream->time_base.num*codec->time_base.den)*codec->ticks_per_frame;\r
 236                 \r
 237                 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
 238 \r
 239                 is_eof_ = false;\r
 240                 buffer_cond_.notify_all();\r
 241 \r
 242                 auto flush_packet       = create_packet();\r
 243                 flush_packet->data      = nullptr;\r
 244                 flush_packet->size      = 0;\r
 245                 flush_packet->pos       = target;\r
 246 \r
 247                 buffer_.push(flush_packet);\r
 248         }       \r
 249 \r
 250         void seek(int64_t target)\r
 251         {\r
 252                 tbb::recursive_mutex::scoped_lock lock(mutex_);\r
 253 \r
 254                 std::shared_ptr<AVPacket> packet;\r
 255                 while(try_pop(packet))\r
 256                 {\r
 257                 }\r
 258 \r
 259                 do_seek(target);\r
 260         }\r
 261 \r
 262         bool is_eof(int ret)\r
 263         {\r
 264                 if(ret == AVERROR(EIO))\r
 265                         CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. ";\r
 266                 if(ret == AVERROR_EOF)\r
 267                         CASPAR_LOG(trace) << print() << " Received EOF. ";\r
 268 \r
 269                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 270         }\r
 271         \r
 272         std::wstring print() const\r
 273         {\r
 274                 return L"ffmpeg_input[" + filename_ + L")]";\r
 275         }\r
 276 };\r
 277 \r
 278 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int64_t start, int64_t length) \r
 279         : impl_(new implementation(graph, filename, loop, start, length)){}\r
 280 bool input::eof() const {return impl_->is_eof_;}\r
 281 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}\r
 282 safe_ptr<AVFormatContext> input::context(){return impl_->format_context_;}\r
 283 void input::loop(bool value){impl_->loop_ = value;}\r
 284 bool input::loop() const{return impl_->loop_;}\r
 285 void input::seek(int64_t target){impl_->seek(target);}\r
 286 }}\r