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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28 #include "../util/util.h"
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29 #include "../../ffmpeg_error.h"
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31 #include <core/video_format.h>
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33 #include <common/diagnostics/graph.h>
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34 #include <common/exception/exceptions.h>
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35 #include <common/exception/win32_exception.h>
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37 #include <tbb/concurrent_queue.h>
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38 #include <tbb/atomic.h>
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40 #include <boost/range/algorithm.hpp>
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41 #include <boost/thread/condition_variable.hpp>
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42 #include <boost/thread/mutex.hpp>
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43 #include <boost/thread/thread.hpp>
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45 #if defined(_MSC_VER)
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46 #pragma warning (push)
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47 #pragma warning (disable : 4244)
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51 #define __STDC_CONSTANT_MACROS
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52 #define __STDC_LIMIT_MACROS
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53 #include <libavformat/avformat.h>
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55 #if defined(_MSC_VER)
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56 #pragma warning (pop)
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59 namespace caspar { namespace ffmpeg {
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61 static const size_t MAX_BUFFER_COUNT = 100;
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62 static const size_t MIN_BUFFER_COUNT = 4;
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63 static const size_t MAX_BUFFER_SIZE = 16 * 1000000;
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65 struct input::implementation : boost::noncopyable
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67 safe_ptr<diagnostics::graph> graph_;
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69 const safe_ptr<AVFormatContext> format_context_; // Destroy this last
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70 const int default_stream_index_;
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72 const std::wstring filename_;
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74 const size_t start_;
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75 const size_t length_;
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76 size_t frame_number_;
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78 tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>> buffer_;
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79 tbb::atomic<size_t> buffer_size_;
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80 boost::condition_variable buffer_cond_;
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81 boost::mutex buffer_mutex_;
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83 tbb::atomic<size_t> nb_frames_;
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84 tbb::atomic<size_t> nb_loops_;
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86 boost::thread thread_;
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87 tbb::atomic<bool> is_running_;
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90 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 , format_context_(open_input(filename))
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93 , default_stream_index_(av_find_default_stream_index(format_context_.get()))
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95 , filename_(filename)
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109 seek_frame(start_);
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111 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));
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112 graph_->set_color("buffer-count", diagnostics::color(0.7f, 0.4f, 0.4f));
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113 graph_->set_color("buffer-size", diagnostics::color(1.0f, 1.0f, 0.0f));
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115 is_running_ = true;
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116 thread_ = boost::thread([this]{run();});
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118 CASPAR_LOG(info) << print() << L" Initialized.";
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123 is_running_ = false;
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124 buffer_cond_.notify_all();
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128 bool try_pop(std::shared_ptr<AVPacket>& packet)
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130 const bool result = buffer_.try_pop(packet);
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135 buffer_size_ -= packet->size;
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136 buffer_cond_.notify_all();
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139 graph_->update_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);
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140 graph_->update_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));
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145 size_t nb_frames() const
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150 size_t nb_loops() const
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159 caspar::win32_exception::install_handler();
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163 CASPAR_LOG(info) << print() << " Thread Started.";
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165 CASPAR_ASSERT(nb_frames_ < 1000);
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170 boost::unique_lock<boost::mutex> lock(buffer_mutex_);
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172 buffer_cond_.timed_wait(lock, boost::posix_time::millisec(20));
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174 read_next_packet();
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177 CASPAR_LOG(info) << print() << " Thread Stopped.";
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181 CASPAR_LOG_CURRENT_EXCEPTION();
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182 is_running_ = false;
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186 void read_next_packet()
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188 auto packet = create_packet();
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189 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.
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191 CASPAR_ASSERT(nb_frames_ < 1000);
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200 int flags = AVSEEK_FLAG_BACKWARD;
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202 int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
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203 if(vid_stream_index >= 0)
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205 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;
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206 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)
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207 flags |= AVSEEK_FLAG_BYTE;
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210 seek_frame(start_, flags);
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211 graph_->add_tag("seek");
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212 CASPAR_LOG(debug) << print() << " Looping.";
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216 is_running_ = false;
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217 CASPAR_LOG(debug) << print() << " Stopping.";
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222 THROW_ON_ERROR(ret, "av_read_frame", print());
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224 if(packet->stream_index == default_stream_index_)
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231 THROW_ON_ERROR2(av_dup_packet(packet.get()), print());
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233 // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.
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234 auto size = packet->size;
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235 auto data = packet->data;
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237 packet = safe_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)
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239 packet->size = size;
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240 packet->data = data;
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243 buffer_.try_push(packet);
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244 buffer_size_ += packet->size;
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246 graph_->update_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);
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247 graph_->update_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));
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253 return is_running_ && (buffer_size_ > MAX_BUFFER_SIZE || buffer_.size() > MAX_BUFFER_COUNT) && buffer_.size() > MIN_BUFFER_COUNT;
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256 void seek_frame(int64_t frame, int flags = 0)
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258 if(flags == AVSEEK_FLAG_BACKWARD)
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261 int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
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262 if(vid_stream_index >= 0)
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264 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;
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265 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)
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266 flags |= AVSEEK_FLAG_BYTE;
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270 THROW_ON_ERROR2(av_seek_frame(format_context_.get(), default_stream_index_, frame, flags), print());
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272 buffer_.push(flush_packet());
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275 bool is_eof(int ret)
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277 if(ret == AVERROR(EIO))
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278 CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. " << nb_frames_;
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279 if(ret == AVERROR_EOF)
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280 CASPAR_LOG(debug) << print() << " Received EOF. " << nb_frames_;
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282 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;
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285 std::wstring print() const
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287 return L"ffmpeg_input[" + filename_ + L")]";
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291 input::input(const safe_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, size_t start, size_t length)
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292 : impl_(new implementation(graph, filename, loop, start, length)){}
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293 bool input::eof() const {return !impl_->is_running_;}
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294 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}
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295 safe_ptr<AVFormatContext> input::context(){return impl_->format_context_;}
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296 size_t input::nb_frames() const {return impl_->nb_frames();}
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297 size_t input::nb_loops() const {return impl_->nb_loops();}
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