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 <core/video_format.h>\r
  30 \r
  31 #include <common/diagnostics/graph.h>\r
  32 #include <common/concurrency/executor.h>\r
  33 #include <common/exception/exceptions.h>\r
  34 #include <common/exception/win32_exception.h>\r
  35 \r
  36 #include <tbb/concurrent_queue.h>\r
  37 #include <tbb/atomic.h>\r
  38 #include <tbb/recursive_mutex.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 static const size_t MAX_BUFFER_COUNT = 100;\r
  60 static const size_t MIN_BUFFER_COUNT = 4;\r
  61 static const size_t MAX_BUFFER_SIZE  = 16 * 1000000;\r
  62 \r
  63 namespace caspar { namespace ffmpeg {\r
  64                 \r
  65 struct input::implementation : boost::noncopyable\r
  66 {               \r
  67         const 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 uint32_t                                                                                          start_;         \r
  74         const uint32_t                                                                                          length_;\r
  75         tbb::atomic<bool>                                                                                       loop_;\r
  76         uint32_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                 \r
  81         executor                                                                                                        executor_;\r
  82         \r
  83         explicit implementation(const safe_ptr<diagnostics::graph> graph, const std::wstring& filename, bool loop, uint32_t start, uint32_t length) \r
  84                 : graph_(graph)\r
  85                 , format_context_(open_input(filename))         \r
  86                 , default_stream_index_(av_find_default_stream_index(format_context_.get()))\r
  87                 , filename_(filename)\r
  88                 , start_(start)\r
  89                 , length_(length)\r
  90                 , frame_number_(0)\r
  91                 , executor_(print())\r
  92         {               \r
  93                 loop_                   = loop;\r
  94                 buffer_size_    = 0;\r
  95 \r
  96                 if(start_ > 0)                  \r
  97                         queued_seek(start_);\r
  98                                                                 \r
  99                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));        \r
 100                 graph_->set_color("buffer-count", diagnostics::color(0.7f, 0.4f, 0.4f));\r
 101                 graph_->set_color("buffer-size", diagnostics::color(1.0f, 1.0f, 0.0f)); \r
 102 \r
 103                 tick();\r
 104         }\r
 105         \r
 106         bool try_pop(std::shared_ptr<AVPacket>& packet)\r
 107         {\r
 108                 auto result = buffer_.try_pop(packet);\r
 109                 \r
 110                 if(result)\r
 111                 {\r
 112                         if(packet)\r
 113                                 buffer_size_ -= packet->size;\r
 114                         tick();\r
 115                 }\r
 116 \r
 117                 graph_->set_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 118                 graph_->set_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 119                 \r
 120                 return result;\r
 121         }\r
 122 \r
 123         void seek(uint32_t target)\r
 124         {\r
 125                 executor_.begin_invoke([=]\r
 126                 {\r
 127                         std::shared_ptr<AVPacket> packet;\r
 128                         while(buffer_.try_pop(packet) && packet)\r
 129                                 buffer_size_ -= packet->size;\r
 130 \r
 131                         queued_seek(target);\r
 132 \r
 133                         tick();\r
 134                 }, high_priority);\r
 135         }\r
 136         \r
 137         std::wstring print() const\r
 138         {\r
 139                 return L"ffmpeg_input[" + filename_ + L")]";\r
 140         }\r
 141         \r
 142         void tick()\r
 143         {               \r
 144                 executor_.begin_invoke([this]\r
 145                 {\r
 146                         auto packet = create_packet();\r
 147                 \r
 148                         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
 149                 \r
 150                         if(is_eof(ret))                                                                                                              \r
 151                         {\r
 152                                 frame_number_   = 0;\r
 153 \r
 154                                 if(loop_)\r
 155                                 {\r
 156                                         queued_seek(start_);\r
 157                                         graph_->set_tag("seek");                \r
 158                                         CASPAR_LOG(trace) << print() << " Looping.";                    \r
 159                                 }               \r
 160                                 else\r
 161                                         executor_.stop();\r
 162                         }\r
 163                         else\r
 164                         {               \r
 165                                 THROW_ON_ERROR(ret, "av_read_frame", print());\r
 166 \r
 167                                 if(packet->stream_index == default_stream_index_)\r
 168                                         ++frame_number_;\r
 169 \r
 170                                 THROW_ON_ERROR2(av_dup_packet(packet.get()), print());\r
 171                                 \r
 172                                 // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.\r
 173                                 auto size = packet->size;\r
 174                                 auto data = packet->data;\r
 175                         \r
 176                                 packet = safe_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)\r
 177                                 {\r
 178                                         packet->size = size;\r
 179                                         packet->data = data;                            \r
 180                                 });\r
 181 \r
 182                                 buffer_.try_push(packet);\r
 183                                 buffer_size_ += packet->size;\r
 184                                 \r
 185                                 graph_->set_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);\r
 186                                 graph_->set_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));\r
 187                         }       \r
 188 \r
 189                         if((buffer_size_ < MAX_BUFFER_SIZE || buffer_.size() > MIN_BUFFER_COUNT) && buffer_.size() < MAX_BUFFER_COUNT && executor_.is_running())                        \r
 190                                 tick();                 \r
 191                 });\r
 192         }       \r
 193                         \r
 194         void queued_seek(const uint32_t target)\r
 195         {       \r
 196                 CASPAR_LOG(debug) << print() << " Seeking: " << target;\r
 197 \r
 198                 int flags = AVSEEK_FLAG_FRAME;\r
 199                 if(target == 0)\r
 200                 {\r
 201                         // Fix VP6 seeking\r
 202                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 203                         if(vid_stream_index >= 0)\r
 204                         {\r
 205                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;\r
 206                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)\r
 207                                         flags = AVSEEK_FLAG_BYTE;\r
 208                         }\r
 209                 }\r
 210                 \r
 211                 auto stream = format_context_->streams[default_stream_index_];\r
 212                 auto codec  = stream->codec;\r
 213                 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
 214                 \r
 215                 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
 216                 \r
 217                 auto flush_packet       = create_packet();\r
 218                 flush_packet->data      = nullptr;\r
 219                 flush_packet->size      = 0;\r
 220                 flush_packet->pos       = target;\r
 221 \r
 222                 buffer_.push(flush_packet);\r
 223         }       \r
 224 \r
 225         bool is_eof(int ret)\r
 226         {\r
 227                 if(ret == AVERROR(EIO))\r
 228                         CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. ";\r
 229                 if(ret == AVERROR_EOF)\r
 230                         CASPAR_LOG(trace) << print() << " Received EOF. ";\r
 231 \r
 232                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 233         }\r
 234 };\r
 235 \r
 236 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, uint32_t start, uint32_t length) \r
 237         : impl_(new implementation(graph, filename, loop, start, length)){}\r
 238 bool input::eof() const {return !impl_->executor_.is_running();}\r
 239 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}\r
 240 safe_ptr<AVFormatContext> input::context(){return impl_->format_context_;}\r
 241 void input::loop(bool value){impl_->loop_ = value;}\r
 242 bool input::loop() const{return impl_->loop_;}\r
 243 void input::seek(uint32_t target){impl_->seek(target);}\r
 244 }}\r