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 #include "../../ffmpeg.h"\r
  29 \r
  30 #include <core/video_format.h>\r
  31 \r
  32 #include <common/diagnostics/graph.h>\r
  33 #include <common/concurrency/executor.h>\r
  34 #include <common/concurrency/future_util.h>\r
  35 #include <common/exception/exceptions.h>\r
  36 #include <common/exception/win32_exception.h>\r
  37 \r
  38 #include <tbb/concurrent_queue.h>\r
  39 #include <tbb/atomic.h>\r
  40 #include <tbb/recursive_mutex.h>\r
  41 \r
  42 #include <boost/range/algorithm.hpp>\r
  43 #include <boost/thread/condition_variable.hpp>\r
  44 #include <boost/thread/mutex.hpp>\r
  45 #include <boost/thread/thread.hpp>\r
  46 \r
  47 #if defined(_MSC_VER)\r
  48 #pragma warning (push)\r
  49 #pragma warning (disable : 4244)\r
  50 #endif\r
  51 extern "C" \r
  52 {\r
  53         #define __STDC_CONSTANT_MACROS\r
  54         #define __STDC_LIMIT_MACROS\r
  55         #include <libavformat/avformat.h>\r
  56 }\r
  57 #if defined(_MSC_VER)\r
  58 #pragma warning (pop)\r
  59 #endif\r
  60 \r
  61 static const size_t MAX_BUFFER_COUNT = 100;\r
  62 static const size_t MIN_BUFFER_COUNT = 50;\r
  63 static const size_t MAX_BUFFER_SIZE  = 64 * 1000000;\r
  64 \r
  65 namespace caspar { namespace ffmpeg {\r
  66                 \r
  67 struct input::implementation : boost::noncopyable\r
  68 {               \r
  69         const safe_ptr<diagnostics::graph>                                                      graph_;\r
  70 \r
  71         const safe_ptr<AVFormatContext>                                                         format_context_; // Destroy this last\r
  72         const int                                                                                                       default_stream_index_;\r
  73                         \r
  74         const std::wstring                                                                                      filename_;\r
  75         const uint32_t                                                                                          start_;         \r
  76         const uint32_t                                                                                          length_;\r
  77         const bool                                                                                                      thumbnail_mode_;\r
  78         tbb::atomic<bool>                                                                                       loop_;\r
  79         uint32_t                                                                                                        frame_number_;\r
  80         \r
  81         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>        buffer_;\r
  82         tbb::atomic<size_t>                                                                                     buffer_size_;\r
  83                 \r
  84         executor                                                                                                        executor_;\r
  85         \r
  86         explicit implementation(const safe_ptr<diagnostics::graph> graph, const std::wstring& filename, bool loop, uint32_t start, uint32_t length, bool thumbnail_mode) \r
  87                 : graph_(graph)\r
  88                 , format_context_(open_input(filename))         \r
  89                 , default_stream_index_(av_find_default_stream_index(format_context_.get()))\r
  90                 , filename_(filename)\r
  91                 , start_(start)\r
  92                 , length_(length)\r
  93                 , thumbnail_mode_(thumbnail_mode)\r
  94                 , frame_number_(0)\r
  95                 , executor_(print())\r
  96         {\r
  97                 if (thumbnail_mode_)\r
  98                         executor_.invoke([]\r
  99                         {\r
 100                                 disable_logging_for_thread();\r
 101                         });\r
 102 \r
 103                 loop_                   = loop;\r
 104                 buffer_size_    = 0;\r
 105 \r
 106                 if(start_ > 0)                  \r
 107                         queued_seek(start_);\r
 108                                                                 \r
 109                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));        \r
 110                 graph_->set_color("buffer-count", diagnostics::color(0.7f, 0.4f, 0.4f));\r
 111                 graph_->set_color("buffer-size", diagnostics::color(1.0f, 1.0f, 0.0f)); \r
 112 \r
 113                 tick();\r
 114         }\r
 115         \r
 116         bool try_pop(std::shared_ptr<AVPacket>& packet)\r
 117         {\r
 118                 auto result = buffer_.try_pop(packet);\r
 119                 \r
 120                 if(result)\r
 121                 {\r
 122                         if(packet)\r
 123                                 buffer_size_ -= packet->size;\r
 124                         tick();\r
 125                 }\r
 126 \r
 127                 graph_->set_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 128                 graph_->set_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 129                 \r
 130                 return result;\r
 131         }\r
 132 \r
 133         std::ptrdiff_t get_max_buffer_count() const\r
 134         {\r
 135                 return thumbnail_mode_ ? 1 : MAX_BUFFER_COUNT;\r
 136         }\r
 137 \r
 138         std::ptrdiff_t get_min_buffer_count() const\r
 139         {\r
 140                 return thumbnail_mode_ ? 0 : MIN_BUFFER_COUNT;\r
 141         }\r
 142 \r
 143         boost::unique_future<bool> seek(uint32_t target)\r
 144         {\r
 145                 if (!executor_.is_running())\r
 146                         return wrap_as_future(false);\r
 147 \r
 148                 return executor_.begin_invoke([=]() -> bool\r
 149                 {\r
 150                         std::shared_ptr<AVPacket> packet;\r
 151                         while(buffer_.try_pop(packet) && packet)\r
 152                                 buffer_size_ -= packet->size;\r
 153 \r
 154                         queued_seek(target);\r
 155 \r
 156                         tick();\r
 157 \r
 158                         return true;\r
 159                 }, high_priority);\r
 160         }\r
 161         \r
 162         std::wstring print() const\r
 163         {\r
 164                 return L"ffmpeg_input[" + filename_ + L")]";\r
 165         }\r
 166         \r
 167         bool full() const\r
 168         {\r
 169                 return (buffer_size_ > MAX_BUFFER_SIZE || buffer_.size() > get_max_buffer_count()) && buffer_.size() > get_min_buffer_count();\r
 170         }\r
 171 \r
 172         void tick()\r
 173         {       \r
 174                 if(!executor_.is_running())\r
 175                         return;\r
 176                 \r
 177                 executor_.begin_invoke([this]\r
 178                 {                       \r
 179                         if(full())\r
 180                                 return;\r
 181 \r
 182                         try\r
 183                         {\r
 184                                 auto packet = create_packet();\r
 185                 \r
 186                                 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
 187                 \r
 188                                 if(is_eof(ret))                                                                                                              \r
 189                                 {\r
 190                                         frame_number_   = 0;\r
 191 \r
 192                                         if(loop_)\r
 193                                         {\r
 194                                                 queued_seek(start_);\r
 195                                                 graph_->set_tag("seek");                \r
 196                                                 CASPAR_LOG(trace) << print() << " Looping.";                    \r
 197                                         }               \r
 198                                         else\r
 199                                                 executor_.stop();\r
 200                                 }\r
 201                                 else\r
 202                                 {               \r
 203                                         THROW_ON_ERROR(ret, "av_read_frame", print());\r
 204 \r
 205                                         if(packet->stream_index == default_stream_index_)\r
 206                                                 ++frame_number_;\r
 207 \r
 208                                         THROW_ON_ERROR2(av_dup_packet(packet.get()), print());\r
 209                                 \r
 210                                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.\r
 211                                         auto size = packet->size;\r
 212                                         auto data = packet->data;\r
 213                         \r
 214                                         packet = safe_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)\r
 215                                         {\r
 216                                                 packet->size = size;\r
 217                                                 packet->data = data;                            \r
 218                                         });\r
 219 \r
 220                                         buffer_.try_push(packet);\r
 221                                         buffer_size_ += packet->size;\r
 222                                 \r
 223                                         graph_->set_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 224                                         graph_->set_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 225                                 }       \r
 226                 \r
 227                                 tick();         \r
 228                         }\r
 229                         catch(...)\r
 230                         {\r
 231                                 if (!thumbnail_mode_)\r
 232                                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 233                                 executor_.stop();\r
 234                         }\r
 235                 });\r
 236         }       \r
 237                         \r
 238         void queued_seek(const uint32_t target)\r
 239         {       \r
 240                 if (!thumbnail_mode_)\r
 241                         CASPAR_LOG(debug) << print() << " Seeking: " << target;\r
 242 \r
 243                 int flags = AVSEEK_FLAG_FRAME;\r
 244                 if(target == 0)\r
 245                 {\r
 246                         // Fix VP6 seeking\r
 247                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 248                         if(vid_stream_index >= 0)\r
 249                         {\r
 250                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;\r
 251                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)\r
 252                                         flags = AVSEEK_FLAG_BYTE;\r
 253                         }\r
 254                 }\r
 255                 \r
 256                 auto stream = format_context_->streams[default_stream_index_];\r
 257                 auto codec  = stream->codec;\r
 258                 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
 259                 \r
 260                 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
 261                 \r
 262                 auto flush_packet       = create_packet();\r
 263                 flush_packet->data      = nullptr;\r
 264                 flush_packet->size      = 0;\r
 265                 flush_packet->pos       = target;\r
 266 \r
 267                 buffer_.push(flush_packet);\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. ";\r
 274                 if(ret == AVERROR_EOF)\r
 275                         CASPAR_LOG(trace) << print() << " Received EOF. ";\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 \r
 281 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, uint32_t start, uint32_t length, bool thumbnail_mode) \r
 282         : impl_(new implementation(graph, filename, loop, start, length, thumbnail_mode)){}\r
 283 bool input::eof() const {return !impl_->executor_.is_running();}\r
 284 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}\r
 285 safe_ptr<AVFormatContext> input::context(){return impl_->format_context_;}\r
 286 void input::loop(bool value){impl_->loop_ = value;}\r
 287 bool input::loop() const{return impl_->loop_;}\r
 288 boost::unique_future<bool> input::seek(uint32_t target){return impl_->seek(target);}\r
 289 }}\r