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/atomic.h>\r
  38 \r
  39 #include <agents.h>\r
  40 #include <concrt_extras.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 \r
  57 #undef Yield\r
  58 using namespace Concurrency;\r
  59 \r
  60 namespace caspar { namespace ffmpeg {\r
  61 \r
  62 static const size_t MAX_PACKETS_SIZE = 16 * 1000000;\r
  63 static const size_t MAX_PACKETS_COUNT = 50;\r
  64         \r
  65 struct input::implementation : public Concurrency::agent\r
  66                                                          , public std::enable_shared_from_this<implementation>\r
  67                                                          , boost::noncopyable\r
  68 {\r
  69         input::target_t&                                                target_;\r
  70 \r
  71         const std::wstring                                              filename_;\r
  72         const safe_ptr<AVFormatContext>                 format_context_; // Destroy this last\r
  73         int                                                                             default_stream_index_;\r
  74         const boost::iterator_range<AVStream**> streams_;\r
  75 \r
  76         safe_ptr<diagnostics::graph>                    graph_;\r
  77                 \r
  78         tbb::atomic<bool>                                               loop_;\r
  79         const size_t                                                    start_;         \r
  80         const size_t                                                    length_;\r
  81         size_t                                                                  frame_number_;\r
  82                         \r
  83         tbb::atomic<size_t>                                             nb_frames_;\r
  84         tbb::atomic<size_t>                                             nb_loops_;      \r
  85         tbb::atomic<size_t>                                             packets_count_;\r
  86         tbb::atomic<size_t>                                             packets_size_;\r
  87 \r
  88         tbb::atomic<bool>                                               is_running_;\r
  89 \r
  90         Concurrency::event                                              event_;\r
  91                 \r
  92 public:\r
  93         explicit implementation(input::target_t& target,\r
  94                                                         const safe_ptr<diagnostics::graph>& graph, \r
  95                                                         const std::wstring& filename, \r
  96                                                         bool loop, \r
  97                                                         size_t start,\r
  98                                                         size_t length)\r
  99                 : target_(target)\r
 100                 , filename_(filename)\r
 101                 , format_context_(open_input(filename))         \r
 102                 , default_stream_index_(av_find_default_stream_index(format_context_.get()))\r
 103                 , streams_(format_context_->streams, format_context_->streams + format_context_->nb_streams)\r
 104                 , graph_(graph)\r
 105                 , start_(start)\r
 106                 , length_(length)\r
 107                 , frame_number_(0)\r
 108         {               \r
 109                 event_.set();\r
 110                 loop_                   = loop;\r
 111                                 \r
 112                 //av_dump_format(format_context_.get(), 0, narrow(filename).c_str(), 0);\r
 113                                 \r
 114                 if(start_ > 0)                  \r
 115                         seek_frame(start_);\r
 116                                                                 \r
 117                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));\r
 118                                 \r
 119                 is_running_ = true;\r
 120         }\r
 121 \r
 122         ~implementation()\r
 123         {\r
 124                 if(is_running_)\r
 125                         stop();\r
 126         }\r
 127         \r
 128         void stop()\r
 129         {\r
 130                 is_running_ = false;\r
 131                 event_.set();\r
 132                 agent::wait(this);\r
 133         }\r
 134         \r
 135         virtual void run()\r
 136         {\r
 137                 try\r
 138                 {\r
 139                         win32_exception::install_handler();\r
 140                         for(auto packet = read_next_packet(); packet && is_running_; packet = read_next_packet())\r
 141                         {                               \r
 142                                 Concurrency::asend(target_, make_safe_ptr(packet));\r
 143                                 Context::Yield();\r
 144                                 event_.wait();\r
 145                         }\r
 146                 }\r
 147                 catch(...)\r
 148                 {\r
 149                         CASPAR_LOG_CURRENT_EXCEPTION();\r
 150                 }       \r
 151         \r
 152                 BOOST_FOREACH(auto stream, streams_)\r
 153                         Concurrency::send(target_, flush_packet(stream->index));        \r
 154                 BOOST_FOREACH(auto stream, streams_)\r
 155                         Concurrency::send(target_, eof_packet(stream->index));  \r
 156 \r
 157                 done();\r
 158         }\r
 159 \r
 160         std::shared_ptr<AVPacket> read_next_packet()\r
 161         {               \r
 162                 auto packet = create_packet();\r
 163                 \r
 164                 int ret = [&]() -> int\r
 165                 {\r
 166                         Concurrency::scoped_oversubcription_token oversubscribe;\r
 167                         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
 168                 }();\r
 169 \r
 170                 if(is_eof(ret))                                                                                                              \r
 171                 {\r
 172                         ++nb_loops_;\r
 173                         frame_number_ = 0;\r
 174 \r
 175                         if(loop_)\r
 176                         {\r
 177                                 CASPAR_LOG(trace) << print() << " Looping.";\r
 178                                 seek_frame(start_, AVSEEK_FLAG_BACKWARD);               \r
 179                                 return read_next_packet();\r
 180                         }       \r
 181                         else\r
 182                         {\r
 183                                 CASPAR_LOG(trace) << print() << " Stopping.";\r
 184                                 return nullptr;\r
 185                         }\r
 186                 }\r
 187 \r
 188                 THROW_ON_ERROR(ret, "av_read_frame", print());\r
 189 \r
 190                 if(packet->stream_index == default_stream_index_)\r
 191                 {\r
 192                         if(nb_loops_ == 0)\r
 193                                 ++nb_frames_;\r
 194                         ++frame_number_;\r
 195                 }\r
 196 \r
 197                 THROW_ON_ERROR2(av_dup_packet(packet.get()), print());\r
 198                                 \r
 199                 // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.\r
 200                 auto size = packet->size;\r
 201                 auto data = packet->data;                       \r
 202                 \r
 203                 ++packets_count_;\r
 204                 packets_size_ += size;\r
 205 \r
 206                 auto self = shared_from_this();\r
 207                 packet = safe_ptr<AVPacket>(packet.get(), [this, self, packet, size, data](AVPacket*)\r
 208                 {\r
 209                         packet->size = size;\r
 210                         packet->data = data;\r
 211                         --packets_count_;\r
 212                         packets_size_ -= size;\r
 213                         event_.set();\r
 214                 });\r
 215 \r
 216                 if(is_running_ && (packets_count_ > MAX_PACKETS_COUNT || packets_size_ > MAX_PACKETS_SIZE))\r
 217                         event_.reset();\r
 218                                                                         \r
 219                 return packet;\r
 220         }\r
 221 \r
 222         void seek_frame(int64_t frame, int flags = 0)\r
 223         {                       \r
 224                 if(flags == AVSEEK_FLAG_BACKWARD)\r
 225                 {\r
 226                         // Fix VP6 seeking\r
 227                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 228                         if(vid_stream_index >= 0)\r
 229                         {\r
 230                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;\r
 231                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)\r
 232                                         flags |= AVSEEK_FLAG_BYTE;\r
 233                         }\r
 234                 }\r
 235 \r
 236                 THROW_ON_ERROR2(av_seek_frame(format_context_.get(), default_stream_index_, frame, flags), print());    \r
 237                 auto packet = create_packet();\r
 238                 packet->size = 0;\r
 239 \r
 240                 BOOST_FOREACH(auto stream, streams_)\r
 241                         Concurrency::asend(target_, flush_packet(stream->index));       \r
 242 \r
 243                 graph_->add_tag("seek");                \r
 244         }               \r
 245 \r
 246         bool is_eof(int ret)\r
 247         {\r
 248                 if(ret == AVERROR(EIO))\r
 249                         CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. " << nb_frames_;\r
 250                 if(ret == AVERROR_EOF)\r
 251                         CASPAR_LOG(trace) << print() << " Received EOF. " << nb_frames_;\r
 252 \r
 253                 CASPAR_VERIFY(ret >= 0 || ret == AVERROR_EOF || ret == AVERROR(EIO), ffmpeg_error() << source_info(narrow(print())));\r
 254 \r
 255                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 256         }\r
 257         \r
 258         std::wstring print() const\r
 259         {\r
 260                 return L"ffmpeg_input[" + filename_ + L")]";\r
 261         }\r
 262 };\r
 263 \r
 264 input::input(input::target_t& target,\r
 265                          const safe_ptr<diagnostics::graph>& graph, \r
 266                          const std::wstring& filename, \r
 267                          bool loop, \r
 268                          size_t start, \r
 269                          size_t length)\r
 270         : impl_(new implementation(target, graph, filename, loop, start, length))\r
 271 {\r
 272 }\r
 273 \r
 274 safe_ptr<AVFormatContext> input::context()\r
 275 {\r
 276         return safe_ptr<AVFormatContext>(impl_->format_context_);\r
 277 }\r
 278 \r
 279 size_t input::nb_frames() const\r
 280 {\r
 281         return impl_->nb_frames_;\r
 282 }\r
 283 \r
 284 size_t input::nb_loops() const \r
 285 {\r
 286         return impl_->nb_loops_;\r
 287 }\r
 288 \r
 289 void input::start()\r
 290 {\r
 291         impl_->start();\r
 292 }\r
 293 \r
 294 void input::stop()\r
 295 {\r
 296         impl_->stop();\r
 297 }\r
 298 \r
 299 bool input::loop() const\r
 300 {\r
 301         return impl_->loop_;\r
 302 }\r
 303 void input::loop(bool value)\r
 304 {\r
 305         impl_->loop_ = value;\r
 306 }\r
 307 \r
 308 }}