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

   1 /*
   2 * Copyright (c) 2011 Sveriges Television AB <info@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 "../../ffmpeg_error.h"
  28 #include "../../ffmpeg.h"
  29
  30 #include <common/diagnostics/graph.h>
  31 #include <common/executor.h>
  32 #include <common/lock.h>
  33 //#include <common/except.h>
  34 #include <common/os/general_protection_fault.h>
  35 #include <common/log.h>
  36
  37 #include <core/video_format.h>
  38
  39 #include <tbb/concurrent_queue.h>
  40 #include <tbb/atomic.h>
  41 #include <tbb/recursive_mutex.h>
  42
  43 #include <boost/thread/condition_variable.hpp>
  44 #include <boost/thread/mutex.hpp>
  45 #include <boost/thread/thread.hpp>
  46
  47 #if defined(_MSC_VER)
  48 #pragma warning (push)
  49 #pragma warning (disable : 4244)
  50 #endif
  51 extern "C"
  52 {
  53         #define __STDC_CONSTANT_MACROS
  54         #define __STDC_LIMIT_MACROS
  55         #include <libavformat/avformat.h>
  56 }
  57 #if defined(_MSC_VER)
  58 #pragma warning (pop)
  59 #endif
  60
  61 namespace caspar { namespace ffmpeg {
  62
  63 static const int MIN_FRAMES = 25;
  64
  65 class stream
  66 {
  67         stream(const stream&);
  68         stream& operator=(const stream&);
  69
  70         typedef tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>::size_type size_type;
  71
  72         int                                                                                                              index_;
  73         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>> packets_;
  74 public:
  75
  76         stream(int index)
  77                 : index_(index)
  78         {
  79         }
  80
  81         bool is_available() const
  82         {
  83                 return index_ >= 0;
  84         }
  85
  86         void push(const std::shared_ptr<AVPacket>& packet)
  87         {
  88                 if(packet && packet->data && packet->stream_index != index_)
  89                         return;
  90
  91                 packets_.push(packet);
  92         }
  93
  94         bool try_pop(std::shared_ptr<AVPacket>& packet)
  95         {
  96                 return packets_.try_pop(packet);
  97         }
  98
  99         void clear()
 100         {
 101                 std::shared_ptr<AVPacket> packet;
 102                 while(packets_.try_pop(packet));
 103         }
 104
 105         size_type size() const
 106         {
 107                 return is_available() ? packets_.size() : std::numeric_limits<size_type>::max();
 108         }
 109 };
 110
 111 struct input::impl : boost::noncopyable
 112 {
 113         const spl::shared_ptr<diagnostics::graph>       graph_;
 114
 115         const std::wstring                                                      filename_;
 116         const spl::shared_ptr<AVFormatContext>          format_context_                 = open_input(filename_); // Destroy this last
 117         const int                                                                       default_stream_index_   = av_find_default_stream_index(format_context_.get());
 118
 119         tbb::atomic<uint32_t>                                           start_;
 120         tbb::atomic<uint32_t>                                           length_;
 121         tbb::atomic<bool>                                                       loop_;
 122         tbb::atomic<bool>                                                       eof_;
 123         double                                                                          fps_                                    = read_fps(*format_context_, 0.0);
 124         uint32_t                                                                        frame_number_                   = 0;
 125
 126         stream                                                                          video_stream_                   { av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0) };
 127         stream                                                                          audio_stream_                   { av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0) };
 128
 129         boost::optional<uint32_t>                                       seek_target_;
 130
 131         tbb::atomic<bool>                                                       is_running_;
 132         boost::mutex                                                            mutex_;
 133         boost::condition_variable                                       cond_;
 134         boost::thread                                                           thread_;
 135
 136         impl(const spl::shared_ptr<diagnostics::graph> graph, const std::wstring& filename, const bool loop, const uint32_t start, const uint32_t length)
 137                 : graph_(graph)
 138                 , filename_(filename)
 139         {
 140                 start_                  = start;
 141                 length_                 = length;
 142                 loop_                   = loop;
 143                 eof_                    = false;
 144                 is_running_             = true;
 145
 146                 if(start_ != 0)
 147                         seek_target_ = start_;
 148
 149                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));
 150
 151                 if (audio_stream_.is_available())
 152                         graph_->set_color("audio-buffer", diagnostics::color(0.7f, 0.4f, 0.4f));
 153
 154                 if (video_stream_.is_available())
 155                         graph_->set_color("video-buffer", diagnostics::color(1.0f, 1.0f, 0.0f));
 156
 157                 for(int n = 0; n < 8; ++n)
 158                         tick();
 159
 160                 thread_ = boost::thread([this]{run();});
 161         }
 162
 163         ~impl()
 164         {
 165                 is_running_ = false;
 166                 cond_.notify_one();
 167                 thread_.join();
 168         }
 169
 170         bool try_pop_video(std::shared_ptr<AVPacket>& packet)
 171         {
 172                 if (!video_stream_.is_available())
 173                         return false;
 174
 175                 bool result = video_stream_.try_pop(packet);
 176                 if(result)
 177                         cond_.notify_one();
 178
 179                 graph_->set_value("video-buffer", std::min(1.0, static_cast<double>(video_stream_.size()/MIN_FRAMES)));
 180
 181                 return result;
 182         }
 183
 184         bool try_pop_audio(std::shared_ptr<AVPacket>& packet)
 185         {
 186                 if (!audio_stream_.is_available())
 187                         return false;
 188
 189                 bool result = audio_stream_.try_pop(packet);
 190                 if(result)
 191                         cond_.notify_one();
 192
 193                 graph_->set_value("audio-buffer", std::min(1.0, static_cast<double>(audio_stream_.size()/MIN_FRAMES)));
 194
 195                 return result;
 196         }
 197
 198         void seek(uint32_t target)
 199         {
 200                 {
 201                         boost::lock_guard<boost::mutex> lock(mutex_);
 202
 203                         seek_target_ = target;
 204                         video_stream_.clear();
 205                         audio_stream_.clear();
 206                 }
 207
 208                 cond_.notify_one();
 209         }
 210
 211         std::wstring print() const
 212         {
 213                 return L"ffmpeg_input[" + filename_ + L")]";
 214         }
 215
 216 private:
 217         void internal_seek(uint32_t target)
 218         {
 219                 eof_ = false;
 220                 graph_->set_tag(diagnostics::tag_severity::INFO, "seek");
 221
 222                 if (!is_logging_disabled_for_thread())
 223                         CASPAR_LOG(debug) << print() << " Seeking: " << target;
 224
 225                 int flags = AVSEEK_FLAG_FRAME;
 226                 if(target == 0)
 227                 {
 228                         // Fix VP6 seeking
 229                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
 230                         if(vid_stream_index >= 0)
 231                         {
 232                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;
 233                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)
 234                                         flags = AVSEEK_FLAG_BYTE;
 235                         }
 236                 }
 237
 238                 auto stream     = format_context_->streams[default_stream_index_];
 239                 auto fps        = read_fps(*format_context_, 0.0);
 240
 241                 THROW_ON_ERROR2(avformat_seek_file(
 242                                 format_context_.get(),
 243                                 default_stream_index_,
 244                                 std::numeric_limits<int64_t>::min(),
 245                                 static_cast<int64_t>((target / fps * stream->time_base.den) / stream->time_base.num),
 246                                 std::numeric_limits<int64_t>::max(),
 247                                 0), print());
 248
 249                 video_stream_.push(nullptr);
 250                 audio_stream_.push(nullptr);
 251         }
 252
 253         void tick()
 254         {
 255                 if(seek_target_)
 256                 {
 257                         internal_seek(*seek_target_);
 258                         seek_target_.reset();
 259                 }
 260
 261                 auto packet = create_packet();
 262
 263                 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.
 264
 265                 if(is_eof(ret))
 266                 {
 267                         if (loop_)
 268                                 internal_seek(start_);
 269                         else
 270                         {
 271                                 audio_stream_.push(packet);
 272                                 video_stream_.push(packet);
 273                                 eof_ = true;
 274                         }
 275                 }
 276                 else
 277                 {
 278                         THROW_ON_ERROR(ret, "av_read_frame", print());
 279
 280                         THROW_ON_ERROR2(av_dup_packet(packet.get()), print());
 281
 282                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.
 283                         const auto size = packet->size;
 284                         const auto data = packet->data;
 285
 286                         packet = spl::shared_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)
 287                         {
 288                                 packet->size = size;
 289                                 packet->data = data;
 290                         });
 291
 292                         const auto stream_time_base = format_context_->streams[packet->stream_index]->time_base;
 293                         const auto packet_frame_number = static_cast<uint32_t>((static_cast<double>(packet->pts * stream_time_base.num)/stream_time_base.den)*fps_);
 294
 295                         if(packet->stream_index == default_stream_index_)
 296                                 frame_number_ = packet_frame_number;
 297
 298                         if(packet_frame_number >= start_ && packet_frame_number < length_)
 299                         {
 300                                 video_stream_.push(packet);
 301                                 audio_stream_.push(packet);
 302                         }
 303                 }
 304
 305                 if (video_stream_.is_available())
 306                         graph_->set_value("video-buffer", std::min(1.0, static_cast<double>(video_stream_.size()/MIN_FRAMES)));
 307
 308                 if (audio_stream_.is_available())
 309                         graph_->set_value("audio-buffer", std::min(1.0, static_cast<double>(audio_stream_.size()/MIN_FRAMES)));
 310         }
 311
 312         bool full() const
 313         {
 314                 return video_stream_.size() >= MIN_FRAMES && audio_stream_.size() >= MIN_FRAMES;
 315         }
 316
 317         void run()
 318         {
 319                 ensure_gpf_handler_installed_for_thread(u8(print()).c_str());
 320
 321                 while(is_running_)
 322                 {
 323                         try
 324                         {
 325
 326                                 {
 327                                         boost::unique_lock<boost::mutex> lock(mutex_);
 328
 329                                         while(full() && !seek_target_ && is_running_)
 330                                                 cond_.wait(lock);
 331
 332                                         tick();
 333                                 }
 334                         }
 335                         catch(...)
 336                         {
 337                                 CASPAR_LOG_CURRENT_EXCEPTION();
 338                                 is_running_ = false;
 339                         }
 340                 }
 341         }
 342
 343         bool is_eof(int ret)
 344         {
 345                 #pragma warning (disable : 4146)
 346                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;
 347         }
 348 };
 349
 350 input::input(const spl::shared_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, uint32_t start, uint32_t length)
 351         : impl_(new impl(graph, filename, loop, start, length)){}
 352 bool input::try_pop_video(std::shared_ptr<AVPacket>& packet){return impl_->try_pop_video(packet);}
 353 bool input::try_pop_audio(std::shared_ptr<AVPacket>& packet){return impl_->try_pop_audio(packet);}
 354 AVFormatContext& input::context(){return *impl_->format_context_;}
 355 void input::loop(bool value){impl_->loop_ = value;}
 356 bool input::loop() const{return impl_->loop_;}
 357 void input::seek(uint32_t target){impl_->seek(target);}
 358 void input::start(uint32_t value){impl_->start_ = value;}
 359 uint32_t input::start() const{return impl_->start_;}
 360 void input::length(uint32_t value){impl_->length_ = value;}
 361 uint32_t input::length() const{return impl_->length_;}
 362 bool input::eof() const { return impl_->eof_; }
 363 }}