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