2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
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4 * This file is part of CasparCG (www.casparcg.com).
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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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19 * Author: Robert Nagy, ronag89@gmail.com
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22 #include "../../stdafx.h"
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26 #include "../util/util.h"
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27 #include "../../ffmpeg_error.h"
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29 #include <common/diagnostics/graph.h>
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30 #include <common/executor.h>
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31 #include <common/except.h>
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32 #include <common/log.h>
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34 #include <core/video_format.h>
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36 #include <tbb/concurrent_queue.h>
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37 #include <tbb/atomic.h>
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38 #include <tbb/recursive_mutex.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 static const size_t MAX_BUFFER_COUNT = 100;
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60 static const size_t MIN_BUFFER_COUNT = 4;
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61 static const size_t MAX_BUFFER_SIZE = 16 * 1000000;
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63 namespace caspar { namespace ffmpeg {
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65 struct input::impl : boost::noncopyable
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67 const spl::shared_ptr<diagnostics::graph> graph_;
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69 const spl::shared_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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73 const uint32_t start_;
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74 const uint32_t length_;
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75 tbb::atomic<bool> loop_;
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76 uint32_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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83 impl(const spl::shared_ptr<diagnostics::graph> graph, const std::wstring& filename, bool loop, uint32_t start, uint32_t length)
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85 , format_context_(open_input(filename))
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86 , default_stream_index_(av_find_default_stream_index(format_context_.get()))
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87 , filename_(filename)
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91 , executor_(print())
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97 queued_seek(start_);
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99 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));
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100 graph_->set_color("buffer-count", diagnostics::color(0.7f, 0.4f, 0.4f));
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101 graph_->set_color("buffer-size", diagnostics::color(1.0f, 1.0f, 0.0f));
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106 bool try_pop(std::shared_ptr<AVPacket>& packet)
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108 auto result = buffer_.try_pop(packet);
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113 buffer_size_ -= packet->size;
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117 graph_->set_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);
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118 graph_->set_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));
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123 void seek(uint32_t target)
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125 executor_.begin_invoke([=]
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127 std::shared_ptr<AVPacket> packet;
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128 while(buffer_.try_pop(packet) && packet)
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129 buffer_size_ -= packet->size;
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131 queued_seek(target);
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134 }, task_priority::high_priority);
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137 std::wstring print() const
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139 return L"ffmpeg_input[" + filename_ + L")]";
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144 return (buffer_size_ > MAX_BUFFER_SIZE || buffer_.size() > MAX_BUFFER_COUNT) && buffer_.size() > MIN_BUFFER_COUNT;
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149 if(!executor_.is_running())
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152 executor_.begin_invoke([this]
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159 auto packet = create_packet();
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161 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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170 queued_seek(start_);
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171 graph_->set_tag("seek");
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172 CASPAR_LOG(trace) << print() << " Looping.";
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176 THROW_ON_ERROR(ret, "av_read_frame", print());
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178 if(packet->stream_index == default_stream_index_)
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181 THROW_ON_ERROR2(av_dup_packet(packet.get()), print());
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183 // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.
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184 auto size = packet->size;
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185 auto data = packet->data;
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187 packet = spl::shared_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)
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189 packet->size = size;
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190 packet->data = data;
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193 buffer_.try_push(packet);
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194 buffer_size_ += packet->size;
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196 graph_->set_value("buffer-size", (static_cast<double>(buffer_size_)+0.001)/MAX_BUFFER_SIZE);
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197 graph_->set_value("buffer-count", (static_cast<double>(buffer_.size()+0.001)/MAX_BUFFER_COUNT));
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204 CASPAR_LOG_CURRENT_EXCEPTION();
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210 void queued_seek(const uint32_t target)
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212 CASPAR_LOG(debug) << print() << " Seeking: " << target;
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214 int flags = AVSEEK_FLAG_FRAME;
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218 int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
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219 if(vid_stream_index >= 0)
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221 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;
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222 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)
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223 flags = AVSEEK_FLAG_BYTE;
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227 auto stream = format_context_->streams[default_stream_index_];
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228 auto codec = stream->codec;
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229 auto fixed_target = (target*stream->time_base.den*codec->time_base.num)/(stream->time_base.num*codec->time_base.den)*codec->ticks_per_frame;
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231 THROW_ON_ERROR2(avformat_seek_file(format_context_.get(), default_stream_index_, std::numeric_limits<int64_t>::min(), fixed_target, std::numeric_limits<int64_t>::max(), 0), print());
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233 auto flush_packet = create_packet();
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234 flush_packet->data = nullptr;
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235 flush_packet->size = 0;
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236 flush_packet->pos = target;
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238 buffer_.push(flush_packet);
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241 bool is_eof(int ret)
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243 #pragma warning (disable : 4146)
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245 //if(ret == AVERROR(EIO))
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246 // CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. ";
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247 //if(ret == AVERROR_EOF)
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248 // CASPAR_LOG(trace) << print() << " Received EOF. ";
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250 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ >= length_; // av_read_frame doesn't always correctly return AVERROR_EOF;
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254 input::input(const spl::shared_ptr<diagnostics::graph>& graph, const std::wstring& filename, bool loop, uint32_t start, uint32_t length)
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255 : impl_(new impl(graph, filename, loop, start, length)){}
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256 bool input::eof() const {return !impl_->executor_.is_running();}
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257 bool input::try_pop(std::shared_ptr<AVPacket>& packet){return impl_->try_pop(packet);}
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258 spl::shared_ptr<AVFormatContext> input::context(){return impl_->format_context_;}
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259 void input::loop(bool value){impl_->loop_ = value;}
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260 bool input::loop() const{return impl_->loop_;}
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261 void input::seek(uint32_t target){impl_->seek(target);}
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