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 = 128;
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61 static const size_t MAX_BUFFER_SIZE = 32 * 1000000;
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63 struct input::implementation : boost::noncopyable
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65 std::shared_ptr<AVFormatContext> format_context_; // Destroy this last
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67 safe_ptr<diagnostics::graph> graph_;
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69 const std::wstring filename_;
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73 tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>> buffer_;
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74 tbb::atomic<size_t> buffer_size_;
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75 boost::condition_variable buffer_cond_;
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76 boost::mutex buffer_mutex_;
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78 boost::thread thread_;
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79 tbb::atomic<bool> is_running_;
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80 tbb::atomic<size_t> nb_frames_;
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81 int64_t frame_number_;
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83 int default_stream_index_;
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85 explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start)
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88 , filename_(filename)
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89 , start_(std::max(start, 0))
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95 AVFormatContext* weak_format_context_ = nullptr;
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96 THROW_ON_ERROR2(avformat_open_input(&weak_format_context_, narrow(filename).c_str(), nullptr, nullptr), print());
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98 format_context_.reset(weak_format_context_, av_close_input_file);
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100 THROW_ON_ERROR2(avformat_find_stream_info(format_context_.get(), nullptr), print());
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102 default_stream_index_ = THROW_ON_ERROR2(av_find_default_stream_index(format_context_.get()), print());
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105 seek_frame(start_);
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107 for(int n = 0; n < 16 && !full(); ++n)
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108 read_next_packet();
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110 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));
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111 graph_->set_color("buffer-count", diagnostics::color(0.2f, 0.8f, 1.0f));
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112 graph_->set_color("buffer-size", diagnostics::color(0.2f, 0.4f, 1.0f));
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114 thread_ = boost::thread([this]{run();});
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119 is_running_ = false;
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120 buffer_cond_.notify_all();
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124 bool try_pop(std::shared_ptr<AVPacket>& packet)
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126 const bool result = buffer_.try_pop(packet);
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131 buffer_size_ -= packet->size;
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132 buffer_cond_.notify_all();
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135 graph_->update_value("buffer-size", MAX_BUFFER_SIZE/static_cast<double>(buffer_size_));
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136 graph_->update_value("buffer-count", MAX_BUFFER_SIZE/static_cast<double>(buffer_.size()));
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141 size_t nb_frames() const
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150 caspar::win32_exception::install_handler();
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154 CASPAR_LOG(info) << print() << " Thread Started.";
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159 boost::unique_lock<boost::mutex> lock(buffer_mutex_);
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160 buffer_cond_.wait(lock, [this]{return !full();});
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162 read_next_packet();
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165 CASPAR_LOG(info) << print() << " Thread Stopped.";
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169 CASPAR_LOG_CURRENT_EXCEPTION();
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170 is_running_ = false;
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174 void read_next_packet()
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178 std::shared_ptr<AVPacket> read_packet(new AVPacket, [](AVPacket* p)
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183 av_init_packet(read_packet.get());
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185 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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189 if(nb_frames_ == 0)
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190 nb_frames_ = static_cast<size_t>(frame_number_);
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194 seek_frame(start_, AVSEEK_FLAG_BACKWARD);
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195 graph_->add_tag("seek");
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196 CASPAR_LOG(trace) << print() << " Received EOF. Looping.";
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200 is_running_ = false;
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201 CASPAR_LOG(trace) << print() << " Received EOF. Stopping.";
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206 THROW_ON_ERROR(ret, print(), "av_read_frame");
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208 if(read_packet->stream_index == default_stream_index_)
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211 THROW_ON_ERROR2(av_dup_packet(read_packet.get()), print());
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213 // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.
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214 auto size = read_packet->size;
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215 auto data = read_packet->data;
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217 read_packet = std::shared_ptr<AVPacket>(read_packet.get(), [=](AVPacket*)
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219 read_packet->size = size;
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220 read_packet->data = data;
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223 buffer_.try_push(read_packet);
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224 buffer_size_ += read_packet->size;
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226 graph_->update_value("buffer-count", MAX_BUFFER_SIZE/static_cast<double>(buffer_.size()));
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227 graph_->update_value("buffer-size", MAX_BUFFER_SIZE/static_cast<double>(buffer_size_));
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233 return is_running_ && buffer_size_ > MAX_BUFFER_SIZE && buffer_.size() > MAX_BUFFER_COUNT;
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236 void seek_frame(int64_t frame, int flags = 0)
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238 THROW_ON_ERROR2(av_seek_frame(format_context_.get(), default_stream_index_, frame, flags), print());
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239 buffer_.push(nullptr);
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242 bool is_eof(int ret)
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244 if(ret == AVERROR(EIO))
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245 CASPAR_LOG(debug) << print() << " Received EIO, assuming EOF.";
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246 //if(ret == AVERROR_EOF)
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247 // CASPAR_LOG(info) << print() << " Received EOF.";
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249 return ret == AVERROR_EOF || ret == AVERROR(EIO); // av_read_frame doesn't always correctly return AVERROR_EOF;
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252 std::wstring print() const
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254 return L"ffmpeg_input[" + filename_ + L")]";
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258 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start, int length)
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259 : impl_(new implementation(graph, filename, loop, start)){}
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260 bool input::eof() const {return !impl_->is_running_;}
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261 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}
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262 safe_ptr<AVFormatContext> input::context(){return make_safe(impl_->format_context_);}
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263 size_t input::nb_frames() const {return impl_->nb_frames();}
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