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