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/lock.h>
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32 #include <common/except.h>
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33 #include <common/log.h>
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35 #include <core/video_format.h>
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37 #include <tbb/concurrent_queue.h>
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38 #include <tbb/atomic.h>
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39 #include <tbb/recursive_mutex.h>
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41 #include <boost/range/algorithm.hpp>
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42 #include <boost/thread/condition_variable.hpp>
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43 #include <boost/thread/mutex.hpp>
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44 #include <boost/thread/thread.hpp>
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46 #if defined(_MSC_VER)
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47 #pragma warning (push)
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48 #pragma warning (disable : 4244)
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52 #define __STDC_CONSTANT_MACROS
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53 #define __STDC_LIMIT_MACROS
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54 #include <libavformat/avformat.h>
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56 #if defined(_MSC_VER)
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57 #pragma warning (pop)
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60 namespace caspar { namespace ffmpeg {
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62 static const int MIN_FRAMES = 25;
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66 stream(const stream&);
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67 stream& operator=(const stream&);
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69 typedef tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>>::size_type size_type;
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72 tbb::concurrent_bounded_queue<std::shared_ptr<AVPacket>> packets_;
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80 void push(const std::shared_ptr<AVPacket>& packet)
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82 if(packet->stream_index != index_ && packet != flush_packet() && packet != null_packet())
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85 packets_.push(packet);
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88 bool try_pop(std::shared_ptr<AVPacket>& packet)
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90 return packets_.try_pop(packet);
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95 std::shared_ptr<AVPacket> packet;
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96 while(packets_.try_pop(packet));
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99 size_type size() const
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101 return index_ != -1 ? packets_.size() : std::numeric_limits<size_type>::max();
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105 struct input::impl : boost::noncopyable
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107 const spl::shared_ptr<diagnostics::graph> graph_;
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109 const spl::shared_ptr<AVFormatContext> format_context_; // Destroy this last
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110 const int default_stream_index_;
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112 const std::wstring filename_;
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113 tbb::atomic<uint32_t> start_;
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114 tbb::atomic<uint32_t> length_;
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115 tbb::atomic<bool> loop_;
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116 tbb::atomic<bool> eof_;
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118 uint32_t frame_number_;
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120 stream video_stream_;
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121 stream audio_stream_;
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123 tbb::atomic<uint32_t> seek_target_;
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125 tbb::atomic<bool> is_running_;
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126 boost::mutex mutex_;
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127 boost::condition_variable cond_;
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128 boost::thread thread_;
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130 impl(const spl::shared_ptr<diagnostics::graph> graph, const std::wstring& filename, const bool loop, const uint32_t start, const uint32_t length)
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132 , format_context_(open_input(filename))
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133 , default_stream_index_(av_find_default_stream_index(format_context_.get()))
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134 , filename_(filename)
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136 , fps_(read_fps(*format_context_, 0.0))
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137 , video_stream_(av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0))
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138 , audio_stream_(av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_AUDIO, -1, -1, 0, 0))
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144 seek_target_ = start_ != 0 ? start_ : std::numeric_limits<uint32_t>::max();
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145 is_running_ = true;
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146 thread_ = boost::thread([this]{run();});
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148 graph_->set_color("seek", diagnostics::color(1.0f, 0.5f, 0.0f));
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149 graph_->set_color("audio-buffer", diagnostics::color(0.7f, 0.4f, 0.4f));
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150 graph_->set_color("video-buffer", diagnostics::color(1.0f, 1.0f, 0.0f));
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158 is_running_ = false;
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159 cond_.notify_one();
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163 bool try_pop_video(std::shared_ptr<AVPacket>& packet)
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165 bool result = video_stream_.try_pop(packet);
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167 cond_.notify_one();
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169 graph_->set_value("video-buffer", std::min(1.0, static_cast<double>(video_stream_.size()/MIN_FRAMES)));
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174 bool try_pop_audio(std::shared_ptr<AVPacket>& packet)
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176 bool result = audio_stream_.try_pop(packet);
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178 cond_.notify_one();
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180 graph_->set_value("audio-buffer", std::min(1.0, static_cast<double>(audio_stream_.size()/MIN_FRAMES)));
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185 void seek(uint32_t target)
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188 boost::lock_guard<boost::mutex> lock(mutex_);
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190 seek_target_ = target;
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191 video_stream_.clear();
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192 audio_stream_.clear();
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199 cond_.notify_one();
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202 std::wstring print() const
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204 return L"ffmpeg_input[" + filename_ + L")]";
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208 void internal_seek(uint32_t target)
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210 CASPAR_LOG(debug) << print() << " Seeking: " << target;
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212 int flags = AVSEEK_FLAG_FRAME;
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216 int vid_stream_index = av_find_best_stream(format_context_.get(), AVMEDIA_TYPE_VIDEO, -1, -1, 0, 0);
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217 if(vid_stream_index >= 0)
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219 auto codec_id = format_context_->streams[vid_stream_index]->codec->codec_id;
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220 if(codec_id == CODEC_ID_VP6A || codec_id == CODEC_ID_VP6F || codec_id == CODEC_ID_VP6)
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221 flags = AVSEEK_FLAG_BYTE;
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225 auto stream = format_context_->streams[default_stream_index_];
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226 auto codec = stream->codec;
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227 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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229 THROW_ON_ERROR2(avformat_seek_file(format_context_.get(), default_stream_index_, std::numeric_limits<int64_t>::min(), fixed_target, fixed_target, 0), print());
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231 video_stream_.push(flush_packet());
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232 audio_stream_.push(flush_packet());
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237 return video_stream_.size() > MIN_FRAMES && audio_stream_.size() > MIN_FRAMES;
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242 auto target = seek_target_.fetch_and_store(std::numeric_limits<uint32_t>::max());
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243 if(target != std::numeric_limits<uint32_t>::max())
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244 internal_seek(target);
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246 auto packet = create_packet();
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248 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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252 for(int n = 0; n < 3; ++n)
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254 video_stream_.push(null_packet());
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255 audio_stream_.push(null_packet());
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260 internal_seek(start_);
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261 graph_->set_tag("seek");
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268 THROW_ON_ERROR(ret, "av_read_frame", print());
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270 THROW_ON_ERROR2(av_dup_packet(packet.get()), print());
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272 // Make sure that the packet is correctly deallocated even if size and data is modified during decoding.
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273 auto size = packet->size;
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274 auto data = packet->data;
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276 packet = spl::shared_ptr<AVPacket>(packet.get(), [packet, size, data](AVPacket*)
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278 packet->size = size;
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279 packet->data = data;
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282 auto stream_time_base = format_context_->streams[packet->stream_index]->time_base;
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283 auto packet_frame_number = static_cast<uint32_t>((static_cast<double>(packet->pts * stream_time_base.num)/stream_time_base.den)*fps_);
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285 if(packet->stream_index == default_stream_index_)
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286 frame_number_ = packet_frame_number;
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288 if(packet_frame_number >= start_ && packet_frame_number < length_)
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290 video_stream_.push(packet);
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291 audio_stream_.push(packet);
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293 graph_->set_value("video-buffer", std::min(1.0, static_cast<double>(video_stream_.size()/MIN_FRAMES)));
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294 graph_->set_value("audio-buffer", std::min(1.0, static_cast<double>(audio_stream_.size()/MIN_FRAMES)));
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301 win32_exception::install_handler();
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308 boost::this_thread::sleep(boost::posix_time::milliseconds(1));
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311 boost::unique_lock<boost::mutex> lock(mutex_);
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313 while((full() || eof_) && is_running_)
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321 CASPAR_LOG_CURRENT_EXCEPTION();
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322 is_running_ = false;
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327 bool is_eof(int ret)
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329 #pragma warning (disable : 4146)
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331 //if(ret == AVERROR(EIO))
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332 // CASPAR_LOG(trace) << print() << " Received EIO, assuming EOF. ";
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333 //if(ret == AVERROR_EOF)
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334 // CASPAR_LOG(trace) << print() << " Received EOF. ";
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336 return ret == AVERROR_EOF || ret == AVERROR(EIO) || frame_number_ > length_; // av_read_frame doesn't always correctly return AVERROR_EOF;
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340 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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341 : impl_(new impl(graph, filename, loop, start, length)){}
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342 bool input::try_pop_video(std::shared_ptr<AVPacket>& packet){return impl_->try_pop_video(packet);}
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343 bool input::try_pop_audio(std::shared_ptr<AVPacket>& packet){return impl_->try_pop_audio(packet);}
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344 AVFormatContext& input::context(){return *impl_->format_context_;}
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345 void input::loop(bool value){impl_->loop_ = value;}
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346 bool input::loop() const{return impl_->loop_;}
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347 void input::seek(uint32_t target){impl_->seek(target);}
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348 void input::start(uint32_t value){impl_->start_ = value;}
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349 uint32_t input::start() const{return impl_->start_;}
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350 void input::length(uint32_t value){impl_->length_ = value;}
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351 uint32_t input::length() const{return impl_->length_;}
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