git.sesse.net Git - casparcg/blob - modules/ffmpeg/producer/input/input.cpp

   1 /*
   2 * Copyright 2013 Sveriges Television AB http://casparcg.com/
   3 *
   4 * This file is part of CasparCG (www.casparcg.com).
   5 *
   6 * CasparCG is free software: you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation, either version 3 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * CasparCG is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
  18 *
  19 * Author: Robert Nagy, ronag89@gmail.com
  20 */
  21
  22 #include "../../StdAfx.h"
  23
  24 #include "input.h"
  25
  26 #include "../util/util.h"
  27 #include "../util/flv.h"
  28 #include "../../ffmpeg_error.h"
  29 #include "../../ffmpeg.h"
  30
  31 #include <core/video_format.h>
  32
  33 #include <common/diagnostics/graph.h>
  34 #include <common/executor.h>
  35 #include <common/except.h>
  36 #include <common/os/general_protection_fault.h>
  37 #include <common/param.h>
  38 #include <common/scope_exit.h>
  39
  40 #include <tbb/concurrent_queue.h>
  41 #include <tbb/atomic.h>
  42 #include <tbb/recursive_mutex.h>
  43
  44 #include <boost/rational.hpp>
  45 #include <boost/range/algorithm.hpp>
  46 #include <boost/thread/condition_variable.hpp>
  47 #include <boost/thread/mutex.hpp>
  48 #include <boost/thread/thread.hpp>
  49
  50 #if defined(_MSC_VER)
  51 #pragma warning (push)
  52 #pragma warning (disable : 4244)
  53 #endif
  54 extern "C"
  55 {
  56         #define __STDC_CONSTANT_MACROS
  57         #define __STDC_LIMIT_MACROS
  58         #include <libavformat/avformat.h>
  59 }
  60 #if defined(_MSC_VER)
  61 #pragma warning (pop)
  62 #endif
  63
  64 static const size_t MAX_BUFFER_COUNT    = 100;
  65 static const size_t MAX_BUFFER_COUNT_RT = 3;
  66 static const size_t MIN_BUFFER_COUNT    = 50;
  67 static const size_t MAX_BUFFER_SIZE     = 64 * 1000000;
  68
  69 namespace caspar { namespace ffmpeg {
  70 struct input::implementation : boost::noncopyable
  71 {
  72         const spl::shared_ptr<diagnostics::graph>                                       graph_;
  73
  74         const spl::shared_ptr<AVFormatContext>                                          format_context_; // Destroy this last
  75         const int                                                                                                       default_stream_index_   = av_find_default_stream_index(format_context_.get());
  76
  77         const std::wstring                                                                                      filename_;
  78         tbb::atomic<uint32_t>                                                                           start_;
  79         tbb::atomic<uint32_t>                                                                           length_;
  80         const bool                                                                                                      thumbnail_mode_;
  81         tbb::atomic<bool>                                                                                       loop_;
  82         uint32_t                                                                                                        frame_number_                   = 0;
  83         boost::rational<int>                                                                            framerate_                              = read_framerate(*format_context_, 1);
  84
  85         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>        buffer_;
  86         tbb::atomic<size_t>                                                                                     buffer_size_;
  87
  88         executor                                                                                                        executor_;
  89
  90         explicit implementation(const spl::shared_ptr<diagnostics::graph> graph, const std::wstring& url_or_file, bool loop, uint32_t start, uint32_t length, bool thumbnail_mode, const ffmpeg_options& vid_params)
  91                 : graph_(graph)
  92                 , format_context_(open_input(url_or_file, vid_params))
  93                 , filename_(url_or_file)
  94                 , thumbnail_mode_(thumbnail_mode)
  95                 , executor_(print())
  96         {
  97                 if (thumbnail_mode_)
  98                         executor_.invoke([]
  99                         {
 100                                 enable_quiet_logging_for_thread();
 101                         });
 102
 103                 start_                  = start;
 104                 length_                 = length;
 105                 loop_                   = loop;
 106                 buffer_size_    = 0;
 107
 108                 if(start_ > 0)
 109                         queued_seek(start_);
 110
 111                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));
 112                 graph_->set_color("buffer-count", diagnostics::color(0.7f, 0.4f, 0.4f));
 113                 graph_->set_color("buffer-size", diagnostics::color(1.0f, 1.0f, 0.0f));
 114
 115                 tick();
 116         }
 117
 118         bool try_pop(std::shared_ptr<AVPacket>& packet)
 119         {
 120                 auto result = buffer_.try_pop(packet);
 121
 122                 if(result)
 123                 {
 124                         if(packet)
 125                                 buffer_size_ -= packet->size;
 126                         tick();
 127                 }
 128
 129                 graph_->set_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);
 130                 graph_->set_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));
 131
 132                 return result;
 133         }
 134
 135         std::ptrdiff_t get_max_buffer_count() const
 136         {
 137                 return thumbnail_mode_ ? 1 : MAX_BUFFER_COUNT;
 138         }
 139
 140         std::ptrdiff_t get_min_buffer_count() const
 141         {
 142                 return thumbnail_mode_ ? 0 : MIN_BUFFER_COUNT;
 143         }
 144
 145         std::future<bool> seek(uint32_t target)
 146         {
 147                 if (!executor_.is_running())
 148                         return make_ready_future(false);
 149
 150                 return executor_.begin_invoke([=]() -> bool
 151                 {
 152                         std::shared_ptr<AVPacket> packet;
 153                         while(buffer_.try_pop(packet) && packet)
 154                                 buffer_size_ -= packet->size;
 155
 156                         queued_seek(target);
 157
 158                         tick();
 159
 160                         return true;
 161                 }, task_priority::high_priority);
 162         }
 163
 164         std::wstring print() const
 165         {
 166                 return L"ffmpeg_input[" + filename_ + L")]";
 167         }
 168
 169         bool full() const
 170         {
 171                 return (buffer_size_ > MAX_BUFFER_SIZE || buffer_.size() > get_max_buffer_count()) && buffer_.size() > get_min_buffer_count();
 172         }
 173
 174         void tick()
 175         {
 176                 if(!executor_.is_running())
 177                         return;
 178
 179                 executor_.begin_invoke([this]
 180                 {
 181                         if(full())
 182                                 return;
 183
 184                         try
 185                         {
 186                                 auto packet = create_packet();
 187
 188                                 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.
 189
 190                                 if(is_eof(ret))
 191                                 {
 192                                         frame_number_   = 0;
 193
 194                                         if(loop_)
 195                                         {
 196                                                 queued_seek(start_);
 197                                                 graph_->set_tag(diagnostics::tag_severity::INFO, "seek");
 198                                                 CASPAR_LOG(trace) << print() << " Looping.";
 199                                         }
 200                                         else
 201                                                 executor_.stop();
 202                                 }
 203                                 else
 204                                 {
 205                                         THROW_ON_ERROR(ret, "av_read_frame", print());
 206
 207                                         if(packet->stream_index == default_stream_index_)
 208                                                 ++frame_number_;
 209
 210                                         THROW_ON_ERROR2(av_dup_packet(packet.get()), print());
 211
 212                                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.
 213                                         auto size = packet->size;
 214                                         auto data = packet->data;
 215
 216                                         packet = spl::shared_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)
 217                                         {
 218                                                 packet->size = size;
 219                                                 packet->data = data;
 220                                         });
 221
 222                                         buffer_.try_push(packet);
 223                                         buffer_size_ += packet->size;
 224
 225                                         graph_->set_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);
 226                                         graph_->set_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));
 227                                 }
 228
 229                                 tick();
 230                         }
 231                         catch(...)
 232                         {
 233                                 if (!thumbnail_mode_)
 234                                         CASPAR_LOG_CURRENT_EXCEPTION();
 235                                 executor_.stop();
 236                         }
 237                 });
 238         }
 239
 240         spl::shared_ptr<AVFormatContext> open_input(const std::wstring& url_or_file, const ffmpeg_options& vid_params)
 241         {
 242                 AVDictionary* format_options = nullptr;
 243
 244                 CASPAR_SCOPE_EXIT
 245                 {
 246                         if (format_options)
 247                                 av_dict_free(&format_options);
 248                 };
 249
 250                 for (auto& option : vid_params)
 251                         av_dict_set(&format_options, option.first.c_str(), option.second.c_str(), 0);
 252
 253                 auto resource_name                      = std::wstring();
 254                 auto parts                                      = caspar::protocol_split(url_or_file);
 255                 auto protocol                           = parts.at(0);
 256                 auto path                                       = parts.at(1);
 257                 AVInputFormat* input_format     = nullptr;
 258
 259                 static const std::set<std::wstring> PROTOCOLS_TREATED_AS_FORMATS = { L"dshow", L"v4l2" };
 260
 261                 if (protocol.empty())
 262                         resource_name = path;
 263                 else if (PROTOCOLS_TREATED_AS_FORMATS.find(protocol) != PROTOCOLS_TREATED_AS_FORMATS.end())
 264                 {
 265                         input_format = av_find_input_format(u8(protocol).c_str());
 266                         resource_name = path;
 267                 }
 268                 else
 269                         resource_name = protocol + L"://" + path;
 270
 271                 AVFormatContext* weak_context = nullptr;
 272                 THROW_ON_ERROR2(avformat_open_input(&weak_context, u8(resource_name).c_str(), input_format, &format_options), resource_name);
 273
 274                 spl::shared_ptr<AVFormatContext> context(weak_context, [](AVFormatContext* ptr)
 275                 {
 276                         avformat_close_input(&ptr);
 277                 });
 278
 279                 if (format_options)
 280                 {
 281                         std::string unsupported_tokens = "";
 282                         AVDictionaryEntry *t = NULL;
 283                         while ((t = av_dict_get(format_options, "", t, AV_DICT_IGNORE_SUFFIX)) != nullptr)
 284                         {
 285                                 if (!unsupported_tokens.empty())
 286                                         unsupported_tokens += ", ";
 287                                 unsupported_tokens += t->key;
 288                         }
 289                         CASPAR_THROW_EXCEPTION(user_error() << msg_info(unsupported_tokens));
 290                 }
 291
 292                 THROW_ON_ERROR2(avformat_find_stream_info(context.get(), nullptr), resource_name);
 293                 fix_meta_data(*context);
 294                 return context;
 295         }
 296
 297         void fix_meta_data(AVFormatContext& context)
 298         {
 299                 auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
 300
 301                 if (video_index > -1)
 302                 {
 303                         auto video_stream = context.streams[video_index];
 304                         auto video_context = context.streams[video_index]->codec;
 305
 306                         if (boost::filesystem::path(context.filename).extension().string() == ".flv")
 307                         {
 308                                 try
 309                                 {
 310                                         auto meta = read_flv_meta_info(context.filename);
 311                                         double fps = boost::lexical_cast<double>(meta["framerate"]);
 312                                         video_stream->nb_frames = static_cast<int64_t>(boost::lexical_cast<double>(meta["duration"])*fps);
 313                                 }
 314                                 catch (...) {}
 315                         }
 316                         else
 317                         {
 318                                 auto stream_time = video_stream->time_base;
 319                                 auto duration = video_stream->duration;
 320                                 auto codec_time = video_context->time_base;
 321                                 auto ticks = video_context->ticks_per_frame;
 322
 323                                 if (video_stream->nb_frames == 0)
 324                                         video_stream->nb_frames = (duration*stream_time.num*codec_time.den) / (stream_time.den*codec_time.num*ticks);
 325                         }
 326                 }
 327         }
 328
 329         void queued_seek(const uint32_t target)
 330         {
 331                 if (!thumbnail_mode_)
 332                         CASPAR_LOG(debug) << print() << " Seeking: " << target;
 333
 334                 int flags = AVSEEK_FLAG_FRAME;
 335                 if(target == 0)
 336                 {
 337                         // Fix VP6 seeking
 338                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
 339                         if(vid_stream_index >= 0)
 340                         {
 341                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;
 342                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)
 343                                         flags = AVSEEK_FLAG_BYTE;
 344                         }
 345                 }
 346
 347                 auto stream = format_context_->streams[default_stream_index_];
 348
 349
 350                 auto fps = read_fps(*format_context_, 0.0);
 351
 352                 THROW_ON_ERROR2(avformat_seek_file(
 353                         format_context_.get(),
 354                         default_stream_index_,
 355                         std::numeric_limits<int64_t>::min(),
 356                         static_cast<int64_t>((target / fps * stream->time_base.den) / stream->time_base.num),
 357                         std::numeric_limits<int64_t>::max(),
 358                         0), print());
 359
 360                 auto flush_packet       = create_packet();
 361                 flush_packet->data      = nullptr;
 362                 flush_packet->size      = 0;
 363                 flush_packet->pos       = target;
 364
 365                 buffer_.push(flush_packet);
 366         }
 367
 368         bool is_eof(int ret)
 369         {
 370                 if(ret == AVERROR(EIO))
 371                         CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. ";
 372                 if(ret == AVERROR_EOF)
 373                         CASPAR_LOG(trace) << print() << " Received EOF. ";
 374
 375                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;
 376         }
 377
 378         int num_audio_streams() const
 379         {
 380                 return 0; // TODO
 381         }
 382
 383         boost::rational<int> framerate() const
 384         {
 385                 return framerate_;
 386         }
 387 };
 388
 389 input::input(const spl::shared_ptr<diagnostics::graph>& graph, const std::wstring& url_or_file, bool loop, uint32_t start, uint32_t length, bool thumbnail_mode, const ffmpeg_options& vid_params)
 390         : impl_(new implementation(graph, url_or_file, loop, start, length, thumbnail_mode, vid_params)){}
 391 bool input::eof() const {return !impl_->executor_.is_running();}
 392 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}
 393 spl::shared_ptr<AVFormatContext> input::context(){return impl_->format_context_;}
 394 void input::start(uint32_t value){impl_->start_ = value;}
 395 uint32_t input::start() const{return impl_->start_;}
 396 void input::length(uint32_t value){impl_->length_ = value;}
 397 uint32_t input::length() const{return impl_->length_;}
 398 void input::loop(bool value){impl_->loop_ = value;}
 399 bool input::loop() const{return impl_->loop_;}
 400 int input::num_audio_streams() const { return impl_->num_audio_streams(); }
 401 boost::rational<int> input::framerate() const { return impl_->framerate(); }
 402 std::future<bool> input::seek(uint32_t target){return impl_->seek(target);}
 403 }}