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/executor.h>\r
  31 #include <common/except.h>\r
  32 #include <common/log.h>\r
  33 \r
  34 #include <core/video_format.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 namespace caspar { namespace ffmpeg {\r
  60 \r
  61 static const int MIN_FRAMES = 25;\r
  62 \r
  63 class stream\r
  64 {\r
  65         stream(const stream&);\r
  66         stream& operator=(const stream&);\r
  67 \r
  68         typedef tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>::size_type size_type;\r
  69 \r
  70         int                                                                                                              index_;\r
  71         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>> packets_;\r
  72 public:\r
  73 \r
  74         stream(int index) \r
  75                 : index_(index)\r
  76         {\r
  77         }\r
  78         \r
  79         void push(const std::shared_ptr<AVPacket>& packet)\r
  80         {\r
  81                 if(packet->stream_index != index_ && packet != flush_packet() && packet != null_packet())\r
  82                         return;\r
  83 \r
  84                 packets_.push(packet);\r
  85         }\r
  86 \r
  87         bool try_pop(std::shared_ptr<AVPacket>& packet)\r
  88         {\r
  89                 return packets_.try_pop(packet);\r
  90         }\r
  91 \r
  92         void clear()\r
  93         {\r
  94                 std::shared_ptr<AVPacket> packet;\r
  95                 while(packets_.try_pop(packet));\r
  96         }\r
  97 \r
  98         size_type size() const\r
  99         {\r
 100                 return index_ != -1 ? packets_.size() : std::numeric_limits<size_type>::max();\r
 101         }\r
 102 };\r
 103                 \r
 104 struct input::impl : boost::noncopyable\r
 105 {               \r
 106         const spl::shared_ptr<diagnostics::graph>                                       graph_;\r
 107 \r
 108         const spl::shared_ptr<AVFormatContext>                                          format_context_; // Destroy this last\r
 109         const int                                                                                                       default_stream_index_;\r
 110                         \r
 111         const std::wstring                                                                                      filename_;\r
 112         tbb::atomic<uint32_t>                                                                           start_;         \r
 113         tbb::atomic<uint32_t>                                                                           length_;\r
 114         tbb::atomic<bool>                                                                                       loop_;\r
 115         tbb::atomic<bool>                                                                                       eof_;\r
 116         double                                                                                                          fps_;\r
 117         uint32_t                                                                                                        frame_number_;\r
 118         \r
 119         stream                                                                                                          video_stream_;\r
 120         stream                                                                                                          audio_stream_;\r
 121 \r
 122         tbb::atomic<uint32_t>                                                                           seek_target_;\r
 123 \r
 124         tbb::atomic<bool>                                                                                       is_running_;\r
 125         boost::mutex                                                                                            mutex_;\r
 126         boost::condition_variable                                                                       cond_;\r
 127         boost::thread                                                                                           thread_;\r
 128         \r
 129         impl(const spl::shared_ptr<diagnostics::graph> graph, const std::wstring& filename, const bool loop, const uint32_t start, const uint32_t length) \r
 130                 : graph_(graph)\r
 131                 , format_context_(open_input(filename))         \r
 132                 , default_stream_index_(av_find_default_stream_index(format_context_.get()))\r
 133                 , filename_(filename)\r
 134                 , frame_number_(0)\r
 135                 , fps_(read_fps(*format_context_, 0.0))\r
 136                 , video_stream_(av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0))\r
 137                 , audio_stream_(av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0))\r
 138         {               \r
 139                 start_                  = start;\r
 140                 length_                 = length;\r
 141                 loop_                   = loop;\r
 142                 eof_                    = false;\r
 143                 seek_target_    = start_;\r
 144                 is_running_             = true;\r
 145                 thread_                 = boost::thread([this]{run();});\r
 146                                                                                 \r
 147                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));        \r
 148                 graph_->set_color("audio-buffer", diagnostics::color(0.7f, 0.4f, 0.4f));\r
 149                 graph_->set_color("video-buffer", diagnostics::color(1.0f, 1.0f, 0.0f));                        \r
 150         }\r
 151 \r
 152         ~impl()\r
 153         {\r
 154                 is_running_ = false;\r
 155                 cond_.notify_one();\r
 156                 thread_.join();\r
 157         }\r
 158         \r
 159         bool try_pop_video(std::shared_ptr<AVPacket>& packet)\r
 160         {                               \r
 161                 bool result = video_stream_.try_pop(packet);\r
 162                 if(result)\r
 163                         cond_.notify_one();\r
 164                 \r
 165                 graph_->set_value("video-buffer", std::min(1.0, static_cast<double>(video_stream_.size()/MIN_FRAMES)));\r
 166                                 \r
 167                 return result;\r
 168         }\r
 169         \r
 170         bool try_pop_audio(std::shared_ptr<AVPacket>& packet)\r
 171         {                               \r
 172                 bool result = audio_stream_.try_pop(packet);\r
 173                 if(result)\r
 174                         cond_.notify_one();\r
 175                                 \r
 176                 graph_->set_value("audio-buffer", std::min(1.0, static_cast<double>(audio_stream_.size()/MIN_FRAMES)));\r
 177 \r
 178                 return result;\r
 179         }\r
 180 \r
 181         void seek(uint32_t target)\r
 182         {\r
 183                 seek_target_ = target;\r
 184                 video_stream_.clear();\r
 185                 audio_stream_.clear();\r
 186 \r
 187                 eof_ = false;\r
 188                 cond_.notify_one();\r
 189         }\r
 190                 \r
 191         std::wstring print() const\r
 192         {\r
 193                 return L"ffmpeg_input[" + filename_ + L")]";\r
 194         }\r
 195 \r
 196 private:\r
 197         void internal_seek(uint32_t target)\r
 198         {\r
 199                 CASPAR_LOG(debug) << print() << " Seeking: " << target;\r
 200 \r
 201                 int flags = AVSEEK_FLAG_FRAME;\r
 202                 if(target == 0)\r
 203                 {\r
 204                         // Fix VP6 seeking\r
 205                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);\r
 206                         if(vid_stream_index >= 0)\r
 207                         {\r
 208                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;\r
 209                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)\r
 210                                         flags = AVSEEK_FLAG_BYTE;\r
 211                         }\r
 212                 }\r
 213                 \r
 214                 auto stream = format_context_->streams[default_stream_index_];\r
 215                 auto codec  = stream->codec;\r
 216                 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
 217                 \r
 218                 THROW_ON_ERROR2(avformat_seek_file(format_context_.get(), default_stream_index_, std::numeric_limits<int64_t>::min(), fixed_target, fixed_target, 0), print());         \r
 219                 \r
 220                 video_stream_.push(flush_packet());\r
 221                 audio_stream_.push(flush_packet());\r
 222         }\r
 223                 \r
 224         bool full() const\r
 225         {\r
 226                 return video_stream_.size() > MIN_FRAMES && audio_stream_.size() > MIN_FRAMES;\r
 227         }\r
 228 \r
 229         void tick()\r
 230         {\r
 231                 auto target = seek_target_.fetch_and_store(std::numeric_limits<uint32_t>::max());\r
 232                 if(target != std::numeric_limits<uint32_t>::max())                              \r
 233                         internal_seek(target);\r
 234 \r
 235                 auto packet = create_packet();\r
 236                 \r
 237                 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
 238                 \r
 239                 if(is_eof(ret))                                                                                                              \r
 240                 {\r
 241                         for(int n = 0; n < 3; ++n)\r
 242                         {\r
 243                                 video_stream_.push(null_packet());\r
 244                                 audio_stream_.push(null_packet());\r
 245                         }\r
 246 \r
 247                         if(loop_)\r
 248                         {\r
 249                                 internal_seek(start_);\r
 250                                 graph_->set_tag("seek");                \r
 251                         }\r
 252                         else\r
 253                                 eof_ = true;\r
 254                 }\r
 255                 else\r
 256                 {               \r
 257                         THROW_ON_ERROR(ret, "av_read_frame", print());\r
 258                                         \r
 259                         THROW_ON_ERROR2(av_dup_packet(packet.get()), print());\r
 260                                 \r
 261                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.\r
 262                         auto size = packet->size;\r
 263                         auto data = packet->data;\r
 264                         \r
 265                         packet = spl::shared_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)\r
 266                         {\r
 267                                 packet->size = size;\r
 268                                 packet->data = data;                            \r
 269                         });\r
 270                                         \r
 271                         auto stream_time_base = format_context_->streams[packet->stream_index]->time_base;\r
 272                         auto packet_frame_number = static_cast<uint32_t>((static_cast<double>(packet->pts * stream_time_base.num)/stream_time_base.den)*fps_);\r
 273 \r
 274                         if(packet->stream_index == default_stream_index_)\r
 275                                 frame_number_ = packet_frame_number;\r
 276                                         \r
 277                         if(packet_frame_number >= start_ && packet_frame_number < length_)\r
 278                         {\r
 279                                 video_stream_.push(packet);\r
 280                                 audio_stream_.push(packet);\r
 281                                                 \r
 282                                 graph_->set_value("video-buffer", std::min(1.0, static_cast<double>(video_stream_.size()/MIN_FRAMES)));\r
 283                                 graph_->set_value("audio-buffer", std::min(1.0, static_cast<double>(audio_stream_.size()/MIN_FRAMES)));\r
 284                         }\r
 285                 }       \r
 286         }\r
 287 \r
 288         void run()\r
 289         {\r
 290                 win32_exception::install_handler();\r
 291 \r
 292                 while(is_running_)\r
 293                 {\r
 294                         boost::unique_lock<boost::mutex> lock(mutex_);\r
 295 \r
 296                         try\r
 297                         {\r
 298                                 tick();\r
 299 \r
 300                                 boost::this_thread::sleep(boost::posix_time::milliseconds(1));\r
 301                                 \r
 302                                 while((full() || eof_) && is_running_)\r
 303                                         cond_.wait(lock);\r
 304                         }\r
 305                         catch(...)\r
 306                         {\r
 307                                 CASPAR_LOG_CURRENT_EXCEPTION();\r
 308                                 is_running_ = false;\r
 309                         }\r
 310                 }\r
 311         }\r
 312                         \r
 313         bool is_eof(int ret)\r
 314         {\r
 315                 #pragma warning (disable : 4146)\r
 316 \r
 317                 //if(ret == AVERROR(EIO))\r
 318                 //      CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. ";\r
 319                 //if(ret == AVERROR_EOF)\r
 320                 //      CASPAR_LOG(trace) << print() << " Received EOF. ";\r
 321 \r
 322                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ > length_; // av_read_frame doesn't always correctly return AVERROR_EOF;\r
 323         }\r
 324 };\r
 325 \r
 326 input::input(const spl::shared_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, uint32_t start, uint32_t length) \r
 327         : impl_(new impl(graph, filename, loop, start, length)){}\r
 328 bool input::try_pop_video(std::shared_ptr<AVPacket>& packet){return impl_->try_pop_video(packet);}\r
 329 bool input::try_pop_audio(std::shared_ptr<AVPacket>& packet){return impl_->try_pop_audio(packet);}\r
 330 AVFormatContext& input::context(){return *impl_->format_context_;}\r
 331 void input::loop(bool value){impl_->loop_ = value;}\r
 332 bool input::loop() const{return impl_->loop_;}\r
 333 void input::seek(uint32_t target){impl_->seek(target);}\r
 334 void input::start(uint32_t value){impl_->start_ = value;}\r
 335 uint32_t input::start() const{return impl_->start_;}\r
 336 void input::length(uint32_t value){impl_->length_ = value;}\r
 337 uint32_t input::length() const{return impl_->length_;}\r
 338 }}\r