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/range/algorithm.hpp>
  45 #include <boost/thread/condition_variable.hpp>
  46 #include <boost/thread/mutex.hpp>
  47 #include <boost/thread/thread.hpp>
  48
  49 #if defined(_MSC_VER)
  50 #pragma warning (push)
  51 #pragma warning (disable : 4244)
  52 #endif
  53 extern "C"
  54 {
  55         #define __STDC_CONSTANT_MACROS
  56         #define __STDC_LIMIT_MACROS
  57         #include <libavformat/avformat.h>
  58 }
  59 #if defined(_MSC_VER)
  60 #pragma warning (pop)
  61 #endif
  62
  63 static const size_t MAX_BUFFER_COUNT    = 100;
  64 static const size_t MAX_BUFFER_COUNT_RT = 3;
  65 static const size_t MIN_BUFFER_COUNT    = 50;
  66 static const size_t MAX_BUFFER_SIZE     = 64 * 1000000;
  67
  68 namespace caspar { namespace ffmpeg {
  69 struct input::implementation : boost::noncopyable
  70 {
  71         const spl::shared_ptr<diagnostics::graph>                                       graph_;
  72
  73         const spl::shared_ptr<AVFormatContext>                                          format_context_; // Destroy this last
  74         const int                                                                                                       default_stream_index_   = av_find_default_stream_index(format_context_.get());
  75
  76         const std::wstring                                                                                      filename_;
  77         tbb::atomic<uint32_t>                                                                           start_;
  78         tbb::atomic<uint32_t>                                                                           length_;
  79         const bool                                                                                                      thumbnail_mode_;
  80         tbb::atomic<bool>                                                                                       loop_;
  81         uint32_t                                                                                                        frame_number_                   = 0;
  82
  83         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>        buffer_;
  84         tbb::atomic<size_t>                                                                                     buffer_size_;
  85
  86         executor                                                                                                        executor_;
  87
  88         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)
  89                 : graph_(graph)
  90                 , format_context_(open_input(url_or_file, vid_params))
  91                 , filename_(url_or_file)
  92                 , thumbnail_mode_(thumbnail_mode)
  93                 , executor_(print())
  94         {
  95                 if (thumbnail_mode_)
  96                         executor_.invoke([]
  97                         {
  98                                 enable_quiet_logging_for_thread();
  99                         });
 100
 101                 start_                  = start;
 102                 length_                 = length;
 103                 loop_                   = loop;
 104                 buffer_size_    = 0;
 105
 106                 if(start_ > 0)
 107                         queued_seek(start_);
 108
 109                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));
 110                 graph_->set_color("buffer-count", diagnostics::color(0.7f, 0.4f, 0.4f));
 111                 graph_->set_color("buffer-size", diagnostics::color(1.0f, 1.0f, 0.0f));
 112
 113                 tick();
 114         }
 115
 116         bool try_pop(std::shared_ptr<AVPacket>& packet)
 117         {
 118                 auto result = buffer_.try_pop(packet);
 119
 120                 if(result)
 121                 {
 122                         if(packet)
 123                                 buffer_size_ -= packet->size;
 124                         tick();
 125                 }
 126
 127                 graph_->set_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);
 128                 graph_->set_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));
 129
 130                 return result;
 131         }
 132
 133         std::ptrdiff_t get_max_buffer_count() const
 134         {
 135                 return thumbnail_mode_ ? 1 : MAX_BUFFER_COUNT;
 136         }
 137
 138         std::ptrdiff_t get_min_buffer_count() const
 139         {
 140                 return thumbnail_mode_ ? 0 : MIN_BUFFER_COUNT;
 141         }
 142
 143         std::future<bool> seek(uint32_t target)
 144         {
 145                 if (!executor_.is_running())
 146                         return make_ready_future(false);
 147
 148                 return executor_.begin_invoke([=]() -> bool
 149                 {
 150                         std::shared_ptr<AVPacket> packet;
 151                         while(buffer_.try_pop(packet) && packet)
 152                                 buffer_size_ -= packet->size;
 153
 154                         queued_seek(target);
 155
 156                         tick();
 157
 158                         return true;
 159                 }, task_priority::high_priority);
 160         }
 161
 162         std::wstring print() const
 163         {
 164                 return L"ffmpeg_input[" + filename_ + L")]";
 165         }
 166
 167         bool full() const
 168         {
 169                 return (buffer_size_ > MAX_BUFFER_SIZE || buffer_.size() > get_max_buffer_count()) && buffer_.size() > get_min_buffer_count();
 170         }
 171
 172         void tick()
 173         {
 174                 if(!executor_.is_running())
 175                         return;
 176
 177                 executor_.begin_invoke([this]
 178                 {
 179                         if(full())
 180                                 return;
 181
 182                         try
 183                         {
 184                                 auto packet = create_packet();
 185
 186                                 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.
 187
 188                                 if(is_eof(ret))
 189                                 {
 190                                         frame_number_   = 0;
 191
 192                                         if(loop_)
 193                                         {
 194                                                 queued_seek(start_);
 195                                                 graph_->set_tag(diagnostics::tag_severity::INFO, "seek");
 196                                                 CASPAR_LOG(trace) << print() << " Looping.";
 197                                         }
 198                                         else
 199                                         {
 200                                                 // Needed by some decoders to decode remaining frames based on last packet.
 201                                                 auto flush_packet = create_packet();
 202                                                 flush_packet->data = nullptr;
 203                                                 flush_packet->size = 0;
 204                                                 flush_packet->pos = -1;
 205
 206                                                 buffer_.push(flush_packet);
 207
 208                                                 executor_.stop();
 209                                         }
 210                                 }
 211                                 else
 212                                 {
 213                                         THROW_ON_ERROR(ret, "av_read_frame", print());
 214
 215                                         if(packet->stream_index == default_stream_index_)
 216                                                 ++frame_number_;
 217
 218                                         THROW_ON_ERROR2(av_dup_packet(packet.get()), print());
 219
 220                                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.
 221                                         auto size = packet->size;
 222                                         auto data = packet->data;
 223
 224                                         packet = spl::shared_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)
 225                                         {
 226                                                 packet->size = size;
 227                                                 packet->data = data;
 228                                         });
 229
 230                                         buffer_.try_push(packet);
 231                                         buffer_size_ += packet->size;
 232
 233                                         graph_->set_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);
 234                                         graph_->set_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));
 235                                 }
 236
 237                                 tick();
 238                         }
 239                         catch(...)
 240                         {
 241                                 if (!thumbnail_mode_)
 242                                         CASPAR_LOG_CURRENT_EXCEPTION();
 243                                 executor_.stop();
 244                         }
 245                 });
 246         }
 247
 248         spl::shared_ptr<AVFormatContext> open_input(const std::wstring& url_or_file, const ffmpeg_options& vid_params)
 249         {
 250                 AVDictionary* format_options = nullptr;
 251
 252                 CASPAR_SCOPE_EXIT
 253                 {
 254                         if (format_options)
 255                                 av_dict_free(&format_options);
 256                 };
 257
 258                 for (auto& option : vid_params)
 259                         av_dict_set(&format_options, option.first.c_str(), option.second.c_str(), 0);
 260
 261                 auto resource_name                      = std::wstring();
 262                 auto parts                                      = caspar::protocol_split(url_or_file);
 263                 auto protocol                           = parts.at(0);
 264                 auto path                                       = parts.at(1);
 265                 AVInputFormat* input_format     = nullptr;
 266
 267                 static const std::set<std::wstring> PROTOCOLS_TREATED_AS_FORMATS = { L"dshow", L"v4l2" };
 268
 269                 if (protocol.empty())
 270                         resource_name = path;
 271                 else if (PROTOCOLS_TREATED_AS_FORMATS.find(protocol) != PROTOCOLS_TREATED_AS_FORMATS.end())
 272                 {
 273                         input_format = av_find_input_format(u8(protocol).c_str());
 274                         resource_name = path;
 275                 }
 276                 else
 277                         resource_name = protocol + L"://" + path;
 278
 279                 AVFormatContext* weak_context = nullptr;
 280                 THROW_ON_ERROR2(avformat_open_input(&weak_context, u8(resource_name).c_str(), input_format, &format_options), resource_name);
 281
 282                 spl::shared_ptr<AVFormatContext> context(weak_context, [](AVFormatContext* ptr)
 283                 {
 284                         avformat_close_input(&ptr);
 285                 });
 286
 287                 if (format_options)
 288                 {
 289                         std::string unsupported_tokens = "";
 290                         AVDictionaryEntry *t = NULL;
 291                         while ((t = av_dict_get(format_options, "", t, AV_DICT_IGNORE_SUFFIX)) != nullptr)
 292                         {
 293                                 if (!unsupported_tokens.empty())
 294                                         unsupported_tokens += ", ";
 295                                 unsupported_tokens += t->key;
 296                         }
 297                         CASPAR_THROW_EXCEPTION(user_error() << msg_info(unsupported_tokens));
 298                 }
 299
 300                 THROW_ON_ERROR2(avformat_find_stream_info(context.get(), nullptr), resource_name);
 301                 fix_meta_data(*context);
 302                 return context;
 303         }
 304
 305         void fix_meta_data(AVFormatContext& context)
 306         {
 307                 auto video_index = av_find_best_stream(&context, AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
 308
 309                 if (video_index > -1)
 310                 {
 311                         auto video_stream = context.streams[video_index];
 312                         auto video_context = context.streams[video_index]->codec;
 313
 314                         if (boost::filesystem::path(context.filename).extension().string() == ".flv")
 315                         {
 316                                 try
 317                                 {
 318                                         auto meta = read_flv_meta_info(context.filename);
 319                                         double fps = boost::lexical_cast<double>(meta["framerate"]);
 320                                         video_stream->nb_frames = static_cast<int64_t>(boost::lexical_cast<double>(meta["duration"])*fps);
 321                                 }
 322                                 catch (...) {}
 323                         }
 324                         else
 325                         {
 326                                 auto stream_time = video_stream->time_base;
 327                                 auto duration = video_stream->duration;
 328                                 auto codec_time = video_context->time_base;
 329                                 auto ticks = video_context->ticks_per_frame;
 330
 331                                 if (video_stream->nb_frames == 0)
 332                                         video_stream->nb_frames = (duration*stream_time.num*codec_time.den) / (stream_time.den*codec_time.num*ticks);
 333                         }
 334                 }
 335         }
 336
 337         void queued_seek(const uint32_t target)
 338         {
 339                 if (!thumbnail_mode_)
 340                         CASPAR_LOG(debug) << print() << " Seeking: " << target;
 341
 342                 int flags = AVSEEK_FLAG_FRAME;
 343                 if(target == 0)
 344                 {
 345                         // Fix VP6 seeking
 346                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
 347                         if(vid_stream_index >= 0)
 348                         {
 349                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;
 350                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)
 351                                         flags = AVSEEK_FLAG_BYTE;
 352                         }
 353                 }
 354
 355                 auto stream = format_context_->streams[default_stream_index_];
 356
 357
 358                 auto fps = read_fps(*format_context_, 0.0);
 359
 360                 THROW_ON_ERROR2(avformat_seek_file(
 361                         format_context_.get(),
 362                         default_stream_index_,
 363                         std::numeric_limits<int64_t>::min(),
 364                         static_cast<int64_t>((target / fps * stream->time_base.den) / stream->time_base.num),
 365                         std::numeric_limits<int64_t>::max(),
 366                         0), print());
 367
 368                 auto flush_packet       = create_packet();
 369                 flush_packet->data      = nullptr;
 370                 flush_packet->size      = 0;
 371                 flush_packet->pos       = target;
 372
 373                 buffer_.push(flush_packet);
 374         }
 375
 376         bool is_eof(int ret)
 377         {
 378                 if(ret == AVERROR(EIO))
 379                         CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. ";
 380                 if(ret == AVERROR_EOF)
 381                         CASPAR_LOG(trace) << print() << " Received EOF. ";
 382
 383                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;
 384         }
 385
 386         int num_audio_streams() const
 387         {
 388                 return 0; // TODO
 389         }
 390 };
 391
 392 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)
 393         : impl_(new implementation(graph, url_or_file, loop, start, length, thumbnail_mode, vid_params)){}
 394 bool input::eof() const {return !impl_->executor_.is_running();}
 395 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}
 396 spl::shared_ptr<AVFormatContext> input::context(){return impl_->format_context_;}
 397 void input::start(uint32_t value){impl_->start_ = value;}
 398 uint32_t input::start() const{return impl_->start_;}
 399 void input::length(uint32_t value){impl_->length_ = value;}
 400 uint32_t input::length() const{return impl_->length_;}
 401 void input::loop(bool value){impl_->loop_ = value;}
 402 bool input::loop() const{return impl_->loop_;}
 403 int input::num_audio_streams() const { return impl_->num_audio_streams(); }
 404 std::future<bool> input::seek(uint32_t target){return impl_->seek(target);}
 405 }}