2 * copyright (c) 2010 Sveriges Television AB <info@casparcg.com>
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4 * This file is part of CasparCG.
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6 * CasparCG is free software: you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation, either version 3 of the License, or
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9 * (at your option) any later version.
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11 * CasparCG is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 * GNU General Public License for more details.
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16 * You should have received a copy of the GNU General Public License
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17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
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20 #if defined(_MSC_VER)
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21 #pragma warning (disable : 4244)
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24 #include "../stdafx.h"
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27 #include "../ffmpeg_error.h"
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28 #include "../tbb_avcodec.h"
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30 #include <core/video_format.h>
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32 #include <common/diagnostics/graph.h>
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33 #include <common/exception/exceptions.h>
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34 #include <common/exception/win32_exception.h>
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36 #include <tbb/concurrent_queue.h>
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37 #include <tbb/atomic.h>
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39 #include <boost/range/algorithm.hpp>
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40 #include <boost/thread/condition_variable.hpp>
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41 #include <boost/thread/mutex.hpp>
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42 #include <boost/thread/thread.hpp>
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44 #if defined(_MSC_VER)
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45 #pragma warning (push)
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46 #pragma warning (disable : 4244)
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50 #define __STDC_CONSTANT_MACROS
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51 #define __STDC_LIMIT_MACROS
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52 #include <libavformat/avformat.h>
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54 #if defined(_MSC_VER)
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55 #pragma warning (pop)
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60 static const size_t MAX_BUFFER_COUNT = 32;
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61 static const size_t MIN_BUFFER_COUNT = 4;
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62 static const size_t MAX_BUFFER_SIZE = 32 * 1000000;
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64 struct input::implementation : boost::noncopyable
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66 std::shared_ptr<AVFormatContext> format_context_; // Destroy this last
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67 int default_stream_index_;
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69 safe_ptr<diagnostics::graph> graph_;
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71 const std::wstring filename_;
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73 const size_t start_;
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74 const size_t length_;
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75 size_t frame_number_;
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77 tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>> buffer_;
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78 tbb::atomic<size_t> buffer_size_;
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79 boost::condition_variable buffer_cond_;
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80 boost::mutex buffer_mutex_;
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82 boost::thread thread_;
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83 tbb::atomic<bool> is_running_;
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85 tbb::atomic<size_t> nb_frames_;
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86 tbb::atomic<size_t> nb_loops_;
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89 explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, size_t start, size_t length)
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92 , filename_(filename)
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101 AVFormatContext* weak_format_context_ = nullptr;
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102 THROW_ON_ERROR2(avformat_open_input(&weak_format_context_, narrow(filename).c_str(), nullptr, nullptr), print());
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104 format_context_.reset(weak_format_context_, av_close_input_file);
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106 av_dump_format(weak_format_context_, 0, narrow(filename).c_str(), 0);
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108 THROW_ON_ERROR2(avformat_find_stream_info(format_context_.get(), nullptr), print());
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110 default_stream_index_ = THROW_ON_ERROR2(av_find_default_stream_index(format_context_.get()), print());
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113 seek_frame(start_);
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115 for(int n = 0; n < 16 && !full(); ++n)
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116 read_next_packet();
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118 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));
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119 graph_->set_color("buffer-count", diagnostics::color(0.2f, 0.8f, 1.0f));
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120 graph_->set_color("buffer-size", diagnostics::color(0.2f, 0.4f, 1.0f));
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122 thread_ = boost::thread([this]{run();});
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127 is_running_ = false;
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128 buffer_cond_.notify_all();
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132 bool try_pop(std::shared_ptr<AVPacket>& packet)
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134 const bool result = buffer_.try_pop(packet);
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139 buffer_size_ -= packet->size;
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140 buffer_cond_.notify_all();
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143 graph_->update_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);
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144 graph_->update_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));
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149 size_t nb_frames() const
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154 size_t nb_loops() const
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163 caspar::win32_exception::install_handler();
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167 CASPAR_LOG(info) << print() << " Thread Started.";
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172 boost::unique_lock<boost::mutex> lock(buffer_mutex_);
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174 buffer_cond_.timed_wait(lock, boost::posix_time::millisec(20));
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176 read_next_packet();
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179 CASPAR_LOG(info) << print() << " Thread Stopped.";
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183 CASPAR_LOG_CURRENT_EXCEPTION();
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184 is_running_ = false;
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188 void read_next_packet()
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192 std::shared_ptr<AVPacket> read_packet(new AVPacket, [](AVPacket* p)
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197 av_init_packet(read_packet.get());
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199 ret = av_read_frame(format_context_.get(), read_packet.get()); // read_packet is only valid until next call of av_read_frame. Use av_dup_packet to extend its life.
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208 int flags = AVSEEK_FLAG_BACKWARD;
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210 int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
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211 if(vid_stream_index >= 0)
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213 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;
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214 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)
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215 flags |= AVSEEK_FLAG_BYTE;
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218 seek_frame(start_, flags);
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219 graph_->add_tag("seek");
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220 CASPAR_LOG(trace) << print() << " Looping.";
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224 is_running_ = false;
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225 CASPAR_LOG(trace) << print() << " Stopping.";
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230 THROW_ON_ERROR(ret, print(), "av_read_frame");
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232 if(read_packet->stream_index == default_stream_index_)
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239 THROW_ON_ERROR2(av_dup_packet(read_packet.get()), print());
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241 // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.
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242 auto size = read_packet->size;
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243 auto data = read_packet->data;
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245 read_packet = std::shared_ptr<AVPacket>(read_packet.get(), [=](AVPacket*)
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247 read_packet->size = size;
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248 read_packet->data = data;
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251 buffer_.try_push(read_packet);
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252 buffer_size_ += read_packet->size;
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254 graph_->update_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);
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255 graph_->update_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));
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261 return is_running_ && (buffer_size_ > MAX_BUFFER_SIZE || buffer_.size() > MAX_BUFFER_COUNT) && buffer_.size() > MIN_BUFFER_COUNT;
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264 void seek_frame(int64_t frame, int flags = 0)
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266 THROW_ON_ERROR2(av_seek_frame(format_context_.get(), default_stream_index_, frame, flags), print());
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267 buffer_.push(nullptr);
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270 bool is_eof(int ret)
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272 if(ret == AVERROR(EIO))
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273 CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. " << nb_frames_;
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274 if(ret == AVERROR_EOF)
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275 CASPAR_LOG(trace) << print() << " Received EOF. " << nb_frames_;
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277 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;
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280 std::wstring print() const
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282 return L"ffmpeg_input[" + filename_ + L")]";
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286 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, size_t start, size_t length)
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287 : impl_(new implementation(graph, filename, loop, start, length)){}
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288 bool input::eof() const {return !impl_->is_running_;}
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289 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}
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290 safe_ptr<AVFormatContext> input::context(){return make_safe(impl_->format_context_);}
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291 size_t input::nb_frames() const {return impl_->nb_frames();}
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292 size_t input::nb_loops() const {return impl_->nb_loops();}
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