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 <common/diagnostics/graph.h>\r
  30 #include <common/concurrency/executor.h>\r
  31 #include <common/exception/exceptions.h>\r
  32 #include <common/exception/win32_exception.h>\r
  33 #include <common/log/log.h>\r
  34 \r
  35 #include <core/video_format.h>\r
  36 \r
  37 #include <tbb/concurrent_queue.h>\r
  38 #include <tbb/atomic.h>\r
  39 #include <tbb/recursive_mutex.h>\r
  40 \r
  41 #include <boost/range/algorithm.hpp>\r
  42 #include <boost/thread/condition_variable.hpp>\r
  43 #include <boost/thread/mutex.hpp>\r
  44 #include <boost/thread/thread.hpp>\r
  45 \r
  46 #if defined(_MSC_VER)\r
  47 #pragma warning (push)\r
  48 #pragma warning (disable : 4244)\r
  49 #endif\r
  50 extern "C" \r
  51 {\r
  52         #define __STDC_CONSTANT_MACROS\r
  53         #define __STDC_LIMIT_MACROS\r
  54         #include <libavformat/avformat.h>\r
  55 }\r
  56 #if defined(_MSC_VER)\r
  57 #pragma warning (pop)\r
  58 #endif\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 namespace caspar { namespace ffmpeg {\r
  65                 \r
  66 struct input::impl : boost::noncopyable\r
  67 {               \r
  68         const safe_ptr<diagnostics::graph>                                                      graph_;\r
  69 \r
  70         const safe_ptr<AVFormatContext>                                                         format_context_; // Destroy this last\r
  71         const int                                                                                                       default_stream_index_;\r
  72                         \r
  73         const std::wstring                                                                                      filename_;\r
  74         const uint32_t                                                                                          start_;         \r
  75         const uint32_t                                                                                          length_;\r
  76         tbb::atomic<bool>                                                                                       loop_;\r
  77         uint32_t                                                                                                        frame_number_;\r
  78         \r
  79         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>        buffer_;\r
  80         tbb::atomic<size_t>                                                                                     buffer_size_;\r
  81                 \r
  82         executor                                                                                                        executor_;\r
  83         \r
  84         impl(const safe_ptr<diagnostics::graph> graph, const std::wstring& filename, bool loop, uint32_t start, uint32_t length) \r
  85                 : graph_(graph)\r
  86                 , format_context_(open_input(filename))         \r
  87                 , default_stream_index_(av_find_default_stream_index(format_context_.get()))\r
  88                 , filename_(filename)\r
  89                 , start_(start)\r
  90                 , length_(length)\r
  91                 , frame_number_(0)\r
  92                 , executor_(print())\r
  93         {               \r
  94                 loop_                   = loop;\r
  95                 buffer_size_    = 0;\r
  96 \r
  97                 if(start_ > 0)                  \r
  98                         queued_seek(start_);\r
  99                                                                 \r
 100                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));        \r
 101                 graph_->set_color("buffer-count", diagnostics::color(0.7f, 0.4f, 0.4f));\r
 102                 graph_->set_color("buffer-size", diagnostics::color(1.0f, 1.0f, 0.0f)); \r
 103 \r
 104                 tick();\r
 105         }\r
 106         \r
 107         bool try_pop(std::shared_ptr<AVPacket>& packet)\r
 108         {\r
 109                 auto result = buffer_.try_pop(packet);\r
 110                 \r
 111                 if(result)\r
 112                 {\r
 113                         if(packet)\r
 114                                 buffer_size_ -= packet->size;\r
 115                         tick();\r
 116                 }\r
 117 \r
 118                 graph_->set_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 119                 graph_->set_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 120                 \r
 121                 return result;\r
 122         }\r
 123 \r
 124         void seek(uint32_t target)\r
 125         {\r
 126                 executor_.begin_invoke([=]\r
 127                 {\r
 128                         std::shared_ptr<AVPacket> packet;\r
 129                         while(buffer_.try_pop(packet) && packet)\r
 130                                 buffer_size_ -= packet->size;\r
 131 \r
 132                         queued_seek(target);\r
 133 \r
 134                         tick();\r
 135                 }, high_priority);\r
 136         }\r
 137         \r
 138         std::wstring print() const\r
 139         {\r
 140                 return L"ffmpeg_input[" + filename_ + L")]";\r
 141         }\r
 142         \r
 143         bool full() const\r
 144         {\r
 145                 return (buffer_size_ > MAX_BUFFER_SIZE || buffer_.size() > MAX_BUFFER_COUNT) && buffer_.size() > MIN_BUFFER_COUNT;\r
 146         }\r
 147 \r
 148         void tick()\r
 149         {       \r
 150                 if(!executor_.is_running())\r
 151                         return;\r
 152                 \r
 153                 executor_.begin_invoke([this]\r
 154                 {                       \r
 155                         if(full())\r
 156                                 return;\r
 157 \r
 158                         try\r
 159                         {\r
 160                                 auto packet = create_packet();\r
 161                 \r
 162                                 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
 163                 \r
 164                                 if(is_eof(ret))                                                                                                              \r
 165                                 {\r
 166                                         frame_number_   = 0;\r
 167 \r
 168                                         if(loop_)\r
 169                                         {\r
 170                                                 queued_seek(start_);\r
 171                                                 graph_->set_tag("seek");                \r
 172                                                 CASPAR_LOG(trace) << print() << " Looping.";                    \r
 173                                         }               \r
 174                                         else\r
 175                                                 executor_.stop();\r
 176                                 }\r
 177                                 else\r
 178                                 {               \r
 179                                         THROW_ON_ERROR(ret, "av_read_frame", print());\r
 180 \r
 181                                         if(packet->stream_index == default_stream_index_)\r
 182                                                 ++frame_number_;\r
 183 \r
 184                                         THROW_ON_ERROR2(av_dup_packet(packet.get()), print());\r
 185                                 \r
 186                                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.\r
 187                                         auto size = packet->size;\r
 188                                         auto data = packet->data;\r
 189                         \r
 190                                         packet = safe_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)\r
 191                                         {\r
 192                                                 packet->size = size;\r
 193                                                 packet->data = data;                            \r
 194                                         });\r
 195 \r
 196                                         buffer_.try_push(packet);\r
 197                                         buffer_size_ += packet->size;\r
 198                                 \r
 199                                         graph_->set_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 200                                         graph_->set_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 201                                 }       \r
 202                 \r
 203                                 tick();         \r
 204                         }\r
 205                         catch(...)\r
 206                         {\r
 207                                 CASPAR_LOG_CURRENT_EXCEPTION();\r
 208                                 executor_.stop();\r
 209                         }\r
 210                 });\r
 211         }       \r
 212                         \r
 213         void queued_seek(const uint32_t target)\r
 214         {       \r
 215                 CASPAR_LOG(debug) << print() << " Seeking: " << target;\r
 216 \r
 217                 int flags = AVSEEK_FLAG_FRAME;\r
 218                 if(target == 0)\r
 219                 {\r
 220                         // Fix VP6 seeking\r
 221                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 222                         if(vid_stream_index >= 0)\r
 223                         {\r
 224                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;\r
 225                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)\r
 226                                         flags = AVSEEK_FLAG_BYTE;\r
 227                         }\r
 228                 }\r
 229                 \r
 230                 auto stream = format_context_->streams[default_stream_index_];\r
 231                 auto codec  = stream->codec;\r
 232                 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
 233                 \r
 234                 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
 235                 \r
 236                 auto flush_packet       = create_packet();\r
 237                 flush_packet->data      = nullptr;\r
 238                 flush_packet->size      = 0;\r
 239                 flush_packet->pos       = target;\r
 240 \r
 241                 buffer_.push(flush_packet);\r
 242         }       \r
 243 \r
 244         bool is_eof(int ret)\r
 245         {\r
 246                 #pragma warning (disable : 4146)\r
 247 \r
 248                 if(ret == AVERROR(EIO))\r
 249                         CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. ";\r
 250                 if(ret == AVERROR_EOF)\r
 251                         CASPAR_LOG(trace) << print() << " Received EOF. ";\r
 252 \r
 253                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 254         }\r
 255 };\r
 256 \r
 257 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, uint32_t start, uint32_t length) \r
 258         : impl_(new impl(graph, filename, loop, start, length)){}\r
 259 bool input::eof() const {return !impl_->executor_.is_running();}\r
 260 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}\r
 261 safe_ptr<AVFormatContext> input::context(){return impl_->format_context_;}\r
 262 void input::loop(bool value){impl_->loop_ = value;}\r
 263 bool input::loop() const{return impl_->loop_;}\r
 264 void input::seek(uint32_t target){impl_->seek(target);}\r
 265 }}\r