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