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
  29 #include <common/diagnostics/graph.h>
  30 #include <common/executor.h>
  31 #include <common/lock.h>
  32 #include <common/except.h>
  33 #include <common/log.h>
  34
  35 #include <core/video_format.h>
  36
  37 #include <tbb/concurrent_queue.h>
  38 #include <tbb/atomic.h>
  39 #include <tbb/recursive_mutex.h>
  40
  41 #include <boost/thread/condition_variable.hpp>
  42 #include <boost/thread/mutex.hpp>
  43 #include <boost/thread/thread.hpp>
  44
  45 #if defined(_MSC_VER)
  46 #pragma warning (push)
  47 #pragma warning (disable : 4244)
  48 #endif
  49 extern "C"
  50 {
  51         #define __STDC_CONSTANT_MACROS
  52         #define __STDC_LIMIT_MACROS
  53         #include <libavformat/avformat.h>
  54 }
  55 #if defined(_MSC_VER)
  56 #pragma warning (pop)
  57 #endif
  58
  59 namespace caspar { namespace ffmpeg {
  60
  61 static const int MIN_FRAMES = 25;
  62
  63 class stream
  64 {
  65         stream(const stream&);
  66         stream& operator=(const stream&);
  67
  68         typedef tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>::size_type size_type;
  69
  70         int                                                                                                              index_;
  71         tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>> packets_;
  72 public:
  73
  74         stream(int index)
  75                 : index_(index)
  76         {
  77         }
  78
  79         void push(const std::shared_ptr<AVPacket>& packet)
  80         {
  81                 if(packet && packet->data && packet->stream_index != index_)
  82                         return;
  83
  84                 packets_.push(packet);
  85         }
  86
  87         bool try_pop(std::shared_ptr<AVPacket>& packet)
  88         {
  89                 return packets_.try_pop(packet);
  90         }
  91
  92         void clear()
  93         {
  94                 std::shared_ptr<AVPacket> packet;
  95                 while(packets_.try_pop(packet));
  96         }
  97
  98         size_type size() const
  99         {
 100                 return index_ != -1 ? packets_.size() : std::numeric_limits<size_type>::max();
 101         }
 102 };
 103
 104 struct input::impl : boost::noncopyable
 105 {
 106         const spl::shared_ptr<diagnostics::graph>       graph_;
 107
 108         const std::wstring                                                      filename_;
 109         const spl::shared_ptr<AVFormatContext>          format_context_                 = open_input(filename_); // Destroy this last
 110         const int                                                                       default_stream_index_   = av_find_default_stream_index(format_context_.get());
 111
 112         tbb::atomic<uint32_t>                                           start_;
 113         tbb::atomic<uint32_t>                                           length_;
 114         tbb::atomic<bool>                                                       loop_;
 115         double                                                                          fps_                                    = read_fps(*format_context_, 0.0);
 116         uint32_t                                                                        frame_number_                   = 0;
 117
 118         stream                                                                          video_stream_                   = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
 119         stream                                                                          audio_stream_                   = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0);
 120
 121         boost::optional<uint32_t>                                       seek_target_;
 122
 123         tbb::atomic<bool>                                                       is_running_;
 124         boost::mutex                                                            mutex_;
 125         boost::condition_variable                                       cond_;
 126         boost::thread                                                           thread_;
 127
 128         impl(const spl::shared_ptr<diagnostics::graph> graph, const std::wstring& filename, const bool loop, const uint32_t start, const uint32_t length)
 129                 : graph_(graph)
 130                 , filename_(filename)
 131         {
 132                 start_                  = start;
 133                 length_                 = length;
 134                 loop_                   = loop;
 135                 is_running_             = true;
 136
 137                 if(start_ != 0)
 138                         seek_target_ = start_;
 139
 140                 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));
 141                 graph_->set_color("audio-buffer", diagnostics::color(0.7f, 0.4f, 0.4f));
 142                 graph_->set_color("video-buffer", diagnostics::color(1.0f, 1.0f, 0.0f));
 143
 144                 for(int n = 0; n < 8; ++n)
 145                         tick();
 146
 147                 thread_ = boost::thread([this]{run();});
 148         }
 149
 150         ~impl()
 151         {
 152                 is_running_ = false;
 153                 cond_.notify_one();
 154                 thread_.join();
 155         }
 156
 157         bool try_pop_video(std::shared_ptr<AVPacket>& packet)
 158         {
 159                 bool result = video_stream_.try_pop(packet);
 160                 if(result)
 161                         cond_.notify_one();
 162
 163                 graph_->set_value("video-buffer", std::min(1.0, static_cast<double>(video_stream_.size()/MIN_FRAMES)));
 164
 165                 return result;
 166         }
 167
 168         bool try_pop_audio(std::shared_ptr<AVPacket>& packet)
 169         {
 170                 bool result = audio_stream_.try_pop(packet);
 171                 if(result)
 172                         cond_.notify_one();
 173
 174                 graph_->set_value("audio-buffer", std::min(1.0, static_cast<double>(audio_stream_.size()/MIN_FRAMES)));
 175
 176                 return result;
 177         }
 178
 179         void seek(uint32_t target)
 180         {
 181                 {
 182                         boost::lock_guard<boost::mutex> lock(mutex_);
 183
 184                         seek_target_ = target;
 185                         video_stream_.clear();
 186                         audio_stream_.clear();
 187                 }
 188
 189                 cond_.notify_one();
 190         }
 191
 192         std::wstring print() const
 193         {
 194                 return L"ffmpeg_input[" + filename_ + L")]";
 195         }
 196
 197 private:
 198         void internal_seek(uint32_t target)
 199         {
 200                 graph_->set_tag("seek");
 201
 202                 CASPAR_LOG(debug) << print() << " Seeking: " << target;
 203
 204                 int flags = AVSEEK_FLAG_FRAME;
 205                 if(target == 0)
 206                 {
 207                         // Fix VP6 seeking
 208                         int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
 209                         if(vid_stream_index >= 0)
 210                         {
 211                                 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;
 212                                 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)
 213                                         flags = AVSEEK_FLAG_BYTE;
 214                         }
 215                 }
 216
 217                 auto stream = format_context_->streams[default_stream_index_];
 218                 auto codec  = stream->codec;
 219                 auto fixed_target = (target*stream->time_base.den*codec->time_base.num)/(stream->time_base.num*codec->time_base.den)*codec->ticks_per_frame;
 220
 221                 THROW_ON_ERROR2(avformat_seek_file(format_context_.get(), default_stream_index_, std::numeric_limits<int64_t>::min(), fixed_target, fixed_target, 0), print());
 222
 223                 video_stream_.push(nullptr);
 224                 audio_stream_.push(nullptr);
 225         }
 226
 227         void tick()
 228         {
 229                 if(seek_target_)
 230                 {
 231                         internal_seek(*seek_target_);
 232                         seek_target_.reset();
 233                 }
 234
 235                 auto packet = create_packet();
 236
 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.
 238
 239                 if(is_eof(ret))
 240                 {
 241                         video_stream_.push(packet);
 242                         audio_stream_.push(packet);
 243
 244                         if(loop_)
 245                                 internal_seek(start_);
 246                 }
 247                 else
 248                 {
 249                         THROW_ON_ERROR(ret, "av_read_frame", print());
 250
 251                         THROW_ON_ERROR2(av_dup_packet(packet.get()), print());
 252
 253                         // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.
 254                         const auto size = packet->size;
 255                         const auto data = packet->data;
 256
 257                         packet = spl::shared_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)
 258                         {
 259                                 packet->size = size;
 260                                 packet->data = data;
 261                         });
 262
 263                         const auto stream_time_base = format_context_->streams[packet->stream_index]->time_base;
 264                         const auto packet_frame_number = static_cast<uint32_t>((static_cast<double>(packet->pts * stream_time_base.num)/stream_time_base.den)*fps_);
 265
 266                         if(packet->stream_index == default_stream_index_)
 267                                 frame_number_ = packet_frame_number;
 268
 269                         if(packet_frame_number >= start_ && packet_frame_number < length_)
 270                         {
 271                                 video_stream_.push(packet);
 272                                 audio_stream_.push(packet);
 273                         }
 274                 }
 275
 276                 graph_->set_value("video-buffer", std::min(1.0, static_cast<double>(video_stream_.size()/MIN_FRAMES)));
 277                 graph_->set_value("audio-buffer", std::min(1.0, static_cast<double>(audio_stream_.size()/MIN_FRAMES)));
 278         }
 279
 280         bool full() const
 281         {
 282                 return video_stream_.size() > MIN_FRAMES && audio_stream_.size() > MIN_FRAMES;
 283         }
 284
 285         void run()
 286         {
 287                 win32_exception::install_handler();
 288
 289                 while(is_running_)
 290                 {
 291                         try
 292                         {
 293                                 boost::this_thread::sleep(boost::posix_time::milliseconds(1));
 294
 295                                 {
 296                                         boost::unique_lock<boost::mutex> lock(mutex_);
 297
 298                                         while(full() && !seek_target_ && is_running_)
 299                                                 cond_.wait(lock);
 300
 301                                         tick();
 302                                 }
 303                         }
 304                         catch(...)
 305                         {
 306                                 CASPAR_LOG_CURRENT_EXCEPTION();
 307                                 is_running_ = false;
 308                         }
 309                 }
 310         }
 311
 312         bool is_eof(int ret)
 313         {
 314                 #pragma warning (disable : 4146)
 315                 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;
 316         }
 317 };
 318
 319 input::input(const spl::shared_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, uint32_t start, uint32_t length)
 320         : impl_(new impl(graph, filename, loop, start, length)){}
 321 bool input::try_pop_video(std::shared_ptr<AVPacket>& packet){return impl_->try_pop_video(packet);}
 322 bool input::try_pop_audio(std::shared_ptr<AVPacket>& packet){return impl_->try_pop_audio(packet);}
 323 AVFormatContext& input::context(){return *impl_->format_context_;}
 324 void input::loop(bool value){impl_->loop_ = value;}
 325 bool input::loop() const{return impl_->loop_;}
 326 void input::seek(uint32_t target){impl_->seek(target);}
 327 void input::start(uint32_t value){impl_->start_ = value;}
 328 uint32_t input::start() const{return impl_->start_;}
 329 void input::length(uint32_t value){impl_->length_ = value;}
 330 uint32_t input::length() const{return impl_->length_;}
 331 }}