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/concurrency/executor.h>
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33 #include <common/diagnostics/graph.h>
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35 #include <tbb/concurrent_queue.h>
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36 #include <tbb/atomic.h>
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38 #include <boost/range/algorithm.hpp>
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39 #include <boost/thread/condition_variable.hpp>
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40 #include <boost/thread/mutex.hpp>
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41 #include <boost/range/iterator_range.hpp>
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45 #define __STDC_CONSTANT_MACROS
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46 #define __STDC_LIMIT_MACROS
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47 #include <libavformat/avformat.h>
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52 static const size_t MAX_BUFFER_COUNT = 128;
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53 static const size_t MAX_BUFFER_SIZE = 32 * 1000000;
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55 struct input::implementation : boost::noncopyable
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57 safe_ptr<diagnostics::graph> graph_;
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59 std::shared_ptr<AVFormatContext> format_context_; // Destroy this last
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61 const std::wstring filename_;
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65 size_t buffer_size_limit_;
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66 tbb::atomic<size_t> buffer_size_;
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67 boost::condition_variable cond_;
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68 boost::mutex mutex_;
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70 tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>> buffer_;
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74 explicit implementation(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start)
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77 , filename_(filename)
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78 , executor_(print())
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79 , start_(std::max(start, 0))
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83 buffer_.set_capacity(MAX_BUFFER_COUNT);
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85 AVFormatContext* weak_format_context_ = nullptr;
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86 errn = av_open_input_file(&weak_format_context_, narrow(filename).c_str(), nullptr, 0, nullptr);
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87 if(errn < 0 || weak_format_context_ == nullptr)
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89 BOOST_THROW_EXCEPTION(
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90 file_read_error() <<
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91 source_info(narrow(print())) <<
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92 msg_info(av_error_str(errn)) <<
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93 boost::errinfo_api_function("av_open_input_file") <<
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94 boost::errinfo_errno(AVUNERROR(errn)) <<
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95 boost::errinfo_file_name(narrow(filename)));
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98 format_context_.reset(weak_format_context_, av_close_input_file);
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100 errn = av_find_stream_info(format_context_.get());
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103 BOOST_THROW_EXCEPTION(
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104 file_read_error() <<
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105 source_info(narrow(print())) <<
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106 msg_info(av_error_str(errn)) <<
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107 boost::errinfo_api_function("av_find_stream_info") <<
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108 boost::errinfo_errno(AVUNERROR(errn)));
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112 seek_frame(start_);
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114 graph_->set_color("seek", diagnostics::color(0.5f, 1.0f, 0.5f));
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115 graph_->set_color("buffer-count", diagnostics::color(0.2f, 0.8f, 1.0f));
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116 graph_->set_color("buffer-size", diagnostics::color(0.2f, 0.4f, 1.0f));
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118 executor_.begin_invoke([this]{read_file();});
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119 CASPAR_LOG(info) << print() << " Started.";
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126 std::shared_ptr<AVPacket> packet;
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127 buffer_.try_pop(packet);
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129 cond_.notify_all();
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132 bool try_pop(std::shared_ptr<AVPacket>& packet)
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134 bool result = buffer_.try_pop(packet);
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135 graph_->update_value("buffer-count", MAX_BUFFER_SIZE/static_cast<double>(buffer_.size()));
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138 buffer_size_ -= packet->size;
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139 graph_->update_value("buffer-size", MAX_BUFFER_SIZE/static_cast<double>(buffer_size_));
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140 cond_.notify_all();
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151 CASPAR_LOG(info) << print() << " Stopping.";
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156 read_next_packet();
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157 executor_.begin_invoke([this]{read_file();});
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160 void read_next_packet()
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164 std::shared_ptr<AVPacket> read_packet(new AVPacket, [](AVPacket* p)
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169 av_init_packet(read_packet.get());
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171 const int errn = av_read_frame(format_context_.get(), read_packet.get()); // read_packet is only valid until next call of av_read_frame.
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172 if(is_eof(errn)) // Use av_dup_packet to extend its life.
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176 seek_frame(start_, AVSEEK_FLAG_BACKWARD);
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177 graph_->add_tag("seek");
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178 //CASPAR_LOG(info) << print() << " Received EOF. Looping.";
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183 //CASPAR_LOG(info) << print() << " Received EOF. Stopping.";
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188 BOOST_THROW_EXCEPTION(
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189 file_read_error() <<
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190 msg_info(av_error_str(errn)) <<
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191 source_info(narrow(print())) <<
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192 boost::errinfo_api_function("av_read_frame") <<
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193 boost::errinfo_errno(AVUNERROR(errn)));
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197 av_dup_packet(read_packet.get());
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198 buffer_.push(read_packet);
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200 graph_->update_value("buffer-count", MAX_BUFFER_SIZE/static_cast<double>(buffer_.size()));
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202 boost::unique_lock<boost::mutex> lock(mutex_);
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203 while(buffer_size_ > MAX_BUFFER_SIZE && buffer_.size() > 2)
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206 buffer_size_ += read_packet->size;
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208 graph_->update_value("buffer-size", MAX_BUFFER_SIZE/static_cast<double>(buffer_size_));
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214 CASPAR_LOG_CURRENT_EXCEPTION();
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219 void seek_frame(int64_t frame, int flags = 0)
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221 static const AVRational base_q = {1, AV_TIME_BASE};
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223 // Convert from frames into seconds.
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224 auto seek_target = frame;//*static_cast<int64_t>(AV_TIME_BASE/fps_);
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226 int stream_index = -1;//video_stream_.index() >= 0 ? video_stream_.index() : audio_stream_.index();
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228 //if(stream_index >= 0)
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229 // seek_target = av_rescale_q(seek_target, base_q, format_context_->streams[stream_index]->time_base);
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231 const int errn = av_seek_frame(format_context_.get(), stream_index, seek_target, flags);
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234 BOOST_THROW_EXCEPTION(
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235 invalid_operation() <<
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236 source_info(narrow(print())) <<
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237 msg_info(av_error_str(errn)) <<
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238 boost::errinfo_api_function("av_seek_frame") <<
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239 boost::errinfo_errno(AVUNERROR(errn)));
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242 buffer_.push(nullptr);
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245 bool is_eof(int errn)
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247 //if(errn == AVERROR(EIO))
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248 // CASPAR_LOG(warning) << print() << " Received EIO, assuming EOF";
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250 return errn == AVERROR_EOF || errn == AVERROR(EIO); // av_read_frame doesn't always correctly return AVERROR_EOF;
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253 std::wstring print() const
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255 return L"ffmpeg_input[" + filename_ + L")]";
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259 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, int start, int length)
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260 : impl_(new implementation(graph, filename, loop, start)){}
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261 bool input::eof() const {return !impl_->executor_.is_running();}
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262 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}
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263 std::shared_ptr<AVFormatContext> input::context(){return impl_->format_context_;}
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