git.sesse.net Git - casparcg/blob - modules/ffmpeg/producer/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 #include "util.h"\r
  28 #include "../ffmpeg_error.h"\r
  29 \r
  30 #include <core/video_format.h>\r
  31 \r
  32 #include <common/diagnostics/graph.h>\r
  33 #include <common/exception/exceptions.h>\r
  34 #include <common/exception/win32_exception.h>\r
  35 \r
  36 #include <tbb/atomic.h>\r
  37 \r
  38 #include <agents.h>\r
  39 #include <concrt_extras.h>\r
  40 #include <semaphore.h>\r
  41 \r
  42 #if defined(_MSC_VER)\r
  43 #pragma warning (push)\r
  44 #pragma warning (disable : 4244)\r
  45 #endif\r
  46 extern "C" \r
  47 {\r
  48         #define __STDC_CONSTANT_MACROS\r
  49         #define __STDC_LIMIT_MACROS\r
  50         #include <libavformat/avformat.h>\r
  51 }\r
  52 #if defined(_MSC_VER)\r
  53 #pragma warning (pop)\r
  54 #endif\r
  55 \r
  56 using namespace Concurrency;\r
  57 \r
  58 namespace caspar { namespace ffmpeg {\r
  59 \r
  60 static const size_t MAX_TOKENS = 32;\r
  61         \r
  62 struct input::implementation : public Concurrency::agent, boost::noncopyable\r
  63 {\r
  64         input::target_t&                                                target_;\r
  65 \r
  66         const std::wstring                                              filename_;\r
  67         const safe_ptr<AVFormatContext>                 format_context_; // Destroy this last\r
  68         int                                                                             default_stream_index_;\r
  69         const boost::iterator_range<AVStream**> streams_;\r
  70 \r
  71         safe_ptr<diagnostics::graph>                    graph_;\r
  72                 \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::atomic<size_t>                                             nb_frames_;\r
  79         tbb::atomic<size_t>                                             nb_loops_;      \r
  80         tbb::atomic<size_t>                                             packets_count_;\r
  81         tbb::atomic<size_t>                                             packets_size_;\r
  82 \r
  83         bool                                                                    stop_;\r
  84                 \r
  85 public:\r
  86         explicit implementation(input::target_t& target,\r
  87                                                         const safe_ptr<diagnostics::graph>& graph, \r
  88                                                         const std::wstring& filename, \r
  89                                                         bool loop, \r
  90                                                         size_t start,\r
  91                                                         size_t length)\r
  92                 : target_(target)\r
  93                 , filename_(filename)\r
  94                 , format_context_(open_input(filename))         \r
  95                 , default_stream_index_(av_find_default_stream_index(format_context_.get()))\r
  96                 , streams_(format_context_->streams, format_context_->streams + format_context_->nb_streams)\r
  97                 , graph_(graph)\r
  98                 , loop_(loop)\r
  99                 , start_(start)\r
 100                 , length_(length)\r
 101                 , frame_number_(0)\r
 102                 , stop_(false)\r
 103         {               \r
 104                 packets_count_  = 0;\r
 105                 packets_size_   = 0;\r
 106                 nb_frames_              = 0;\r
 107                 nb_loops_               = 0;\r
 108                                 \r
 109                 av_dump_format(format_context_.get(), 0, narrow(filename).c_str(), 0);\r
 110                                 \r
 111                 if(start_ > 0)                  \r
 112                         seek_frame(start_);\r
 113                                                                 \r
 114                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));\r
 115         }\r
 116         \r
 117         void stop()\r
 118         {\r
 119                 stop_ = true;\r
 120                 agent::wait(this);\r
 121         }\r
 122         \r
 123         virtual void run()\r
 124         {\r
 125                 try\r
 126                 {\r
 127                         while(!stop_)\r
 128                         {\r
 129                                 auto packet = read_next_packet();\r
 130                                 if(!packet)\r
 131                                         break;\r
 132 \r
 133                                 Concurrency::asend(target_, make_safe_ptr(packet));\r
 134                                 Concurrency::wait(40);\r
 135                         }\r
 136                 }\r
 137                 catch(...)\r
 138                 {\r
 139                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 140                 }       \r
 141         \r
 142                 BOOST_FOREACH(auto stream, streams_)\r
 143                         Concurrency::send(target_, eof_packet(stream->index));  \r
 144 \r
 145                 done();\r
 146         }\r
 147 \r
 148         std::shared_ptr<AVPacket> read_next_packet()\r
 149         {               \r
 150                 auto packet = create_packet();\r
 151                 \r
 152                 int ret = [&]() -> int\r
 153                 {\r
 154                         Concurrency::scoped_oversubcription_token oversubscribe;\r
 155                         return 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
 156                 }();\r
 157 \r
 158                 if(is_eof(ret))                                                                                                              \r
 159                 {\r
 160                         ++nb_loops_;\r
 161                         frame_number_ = 0;\r
 162 \r
 163                         if(loop_)\r
 164                         {\r
 165                                 CASPAR_LOG(trace) << print() << " Looping.";\r
 166                                 seek_frame(start_, AVSEEK_FLAG_BACKWARD);               \r
 167                                 return read_next_packet();\r
 168                         }       \r
 169                         else\r
 170                         {\r
 171                                 CASPAR_LOG(trace) << print() << " Stopping.";\r
 172                                 return nullptr;\r
 173                         }\r
 174                 }\r
 175 \r
 176                 THROW_ON_ERROR(ret, print(), "av_read_frame");\r
 177 \r
 178                 if(packet->stream_index == default_stream_index_)\r
 179                 {\r
 180                         if(nb_loops_ == 0)\r
 181                                 ++nb_frames_;\r
 182                         ++frame_number_;\r
 183                 }\r
 184 \r
 185                 THROW_ON_ERROR2(av_dup_packet(packet.get()), print());\r
 186                                 \r
 187                 // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.\r
 188                 auto size = packet->size;\r
 189                 auto data = packet->data;                       \r
 190 \r
 191                 packet = safe_ptr<AVPacket>(packet.get(), [=](AVPacket*)\r
 192                 {\r
 193                         packet->size = size;\r
 194                         packet->data = data;\r
 195                         --packets_count_;\r
 196                 });\r
 197 \r
 198                 ++packets_count_;\r
 199                                                         \r
 200                 return packet;\r
 201         }\r
 202 \r
 203         void seek_frame(int64_t frame, int flags = 0)\r
 204         {                       \r
 205                 if(flags == AVSEEK_FLAG_BACKWARD)\r
 206                 {\r
 207                         // Fix VP6 seeking\r
 208                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 209                         if(vid_stream_index >= 0)\r
 210                         {\r
 211                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;\r
 212                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)\r
 213                                         flags |= AVSEEK_FLAG_BYTE;\r
 214                         }\r
 215                 }\r
 216 \r
 217                 THROW_ON_ERROR2(av_seek_frame(format_context_.get(), default_stream_index_, frame, flags), print());    \r
 218                 auto packet = create_packet();\r
 219                 packet->size = 0;\r
 220 \r
 221                 BOOST_FOREACH(auto stream, streams_)\r
 222                         Concurrency::asend(target_, loop_packet(stream->index));        \r
 223 \r
 224                 graph_->add_tag("seek");                \r
 225         }               \r
 226 \r
 227         bool is_eof(int ret)\r
 228         {\r
 229                 if(ret == AVERROR(EIO))\r
 230                         CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. " << nb_frames_;\r
 231                 if(ret == AVERROR_EOF)\r
 232                         CASPAR_LOG(trace) << print() << " Received EOF. " << nb_frames_;\r
 233 \r
 234                 CASPAR_VERIFY(ret >= 0 || ret == AVERROR_EOF || ret == AVERROR(EIO), ffmpeg_error() << source_info(narrow(print())));\r
 235 \r
 236                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 237         }\r
 238         \r
 239         std::wstring print() const\r
 240         {\r
 241                 return L"ffmpeg_input[" + filename_ + L")]";\r
 242         }\r
 243 };\r
 244 \r
 245 input::input(input::target_t& target,\r
 246                          const safe_ptr<diagnostics::graph>& graph, \r
 247                          const std::wstring& filename, \r
 248                          bool loop, \r
 249                          size_t start, \r
 250                          size_t length)\r
 251         : impl_(new implementation(target, graph, filename, loop, start, length))\r
 252 {\r
 253 }\r
 254 \r
 255 safe_ptr<AVFormatContext> input::context()\r
 256 {\r
 257         return safe_ptr<AVFormatContext>(impl_->format_context_);\r
 258 }\r
 259 \r
 260 size_t input::nb_frames() const\r
 261 {\r
 262         return impl_->nb_frames_;\r
 263 }\r
 264 \r
 265 size_t input::nb_loops() const \r
 266 {\r
 267         return impl_->nb_loops_;\r
 268 }\r
 269 \r
 270 void input::start()\r
 271 {\r
 272         impl_->start();\r
 273 }\r
 274 \r
 275 void input::stop()\r
 276 {\r
 277         impl_->stop();\r
 278 }\r
 279 \r
 280 }}