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 #include "../../stdafx.h"
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22 #include "video_decoder.h"
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23 #include "../util.h"
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24 #include "../filter/filter.h"
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26 #include "../../ffmpeg_error.h"
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27 #include "../../tbb_avcodec.h"
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29 #include <common/memory/memcpy.h>
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31 #include <core/video_format.h>
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32 #include <core/producer/frame/basic_frame.h>
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33 #include <core/mixer/write_frame.h>
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34 #include <core/producer/frame/image_transform.h>
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35 #include <core/producer/frame/frame_factory.h>
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36 #include <core/producer/color/color_producer.h>
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38 #include <tbb/task_group.h>
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40 #include <boost/range/algorithm_ext.hpp>
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42 #if defined(_MSC_VER)
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43 #pragma warning (push)
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44 #pragma warning (disable : 4244)
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48 #define __STDC_CONSTANT_MACROS
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49 #define __STDC_LIMIT_MACROS
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50 #include <libavformat/avformat.h>
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51 #include <libavcodec/avcodec.h>
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53 #if defined(_MSC_VER)
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54 #pragma warning (pop)
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59 struct video_decoder::implementation : boost::noncopyable
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61 const safe_ptr<core::frame_factory> frame_factory_;
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62 std::shared_ptr<AVCodecContext> codec_context_;
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64 core::video_mode::type mode_;
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66 std::queue<std::shared_ptr<AVPacket>> packet_buffer_;
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68 std::unique_ptr<filter> filter_;
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69 tbb::task_group filter_tasks_;
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73 explicit implementation(const std::shared_ptr<AVFormatContext>& context, const safe_ptr<core::frame_factory>& frame_factory, const std::wstring& filter)
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74 : frame_factory_(frame_factory)
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75 , mode_(core::video_mode::invalid)
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76 , filter_(filter.empty() ? nullptr : new caspar::filter(filter))
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77 , fps_(frame_factory_->get_video_format_desc().fps)
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80 index_ = av_find_best_stream(context.get(), AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0);
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85 int errn = tbb_avcodec_open(context->streams[index_]->codec, dec);
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89 codec_context_.reset(context->streams[index_]->codec, tbb_avcodec_close);
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91 // Some files give an invalid time_base numerator, try to fix it.
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92 if(codec_context_ && codec_context_->time_base.num == 1)
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93 codec_context_->time_base.num = static_cast<int>(std::pow(10.0, static_cast<int>(std::log10(static_cast<float>(codec_context_->time_base.den)))-1));
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95 fps_ = static_cast<double>(codec_context_->time_base.den) / static_cast<double>(codec_context_->time_base.num);
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96 if(double_rate(filter))
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102 filter_tasks_.cancel();
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103 filter_tasks_.wait();
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106 void push(const std::shared_ptr<AVPacket>& packet)
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108 if(!codec_context_)
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111 if(packet && packet->stream_index != index_)
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114 packet_buffer_.push(packet);
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117 std::vector<std::shared_ptr<core::write_frame>> poll()
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119 std::vector<std::shared_ptr<core::write_frame>> result;
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121 if(!codec_context_)
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122 result.push_back(make_safe<core::write_frame>(reinterpret_cast<int>(this)));
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123 else if(!packet_buffer_.empty())
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125 std::vector<safe_ptr<AVFrame>> av_frames;
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127 auto packet = std::move(packet_buffer_.front());
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128 packet_buffer_.pop();
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131 decode(*packet, av_frames);
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134 if(codec_context_->codec->capabilities | CODEC_CAP_DELAY)
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136 // FIXME: This might cause bad performance.
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137 AVPacket pkt = {0};
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138 for(int n = 0; n < 8 && decode(pkt, av_frames); ++n){}
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141 avcodec_flush_buffers(codec_context_.get());
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146 auto av_frames2 = std::move(av_frames);
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148 filter_tasks_.wait();
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150 av_frames = filter_->poll();
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152 filter_tasks_.run([=]
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154 BOOST_FOREACH(auto& frame, av_frames2)
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155 filter_->push(frame);
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159 BOOST_FOREACH(auto& frame, av_frames)
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160 result.push_back(make_write_frame(this, frame, frame_factory_));
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163 result.push_back(nullptr);
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169 bool decode(AVPacket& packet, std::vector<safe_ptr<AVFrame>>& av_frames)
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171 std::shared_ptr<AVFrame> decoded_frame(avcodec_alloc_frame(), av_free);
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173 int frame_finished = 0;
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174 const int errn = avcodec_decode_video2(codec_context_.get(), decoded_frame.get(), &frame_finished, &packet);
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178 BOOST_THROW_EXCEPTION(
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179 invalid_operation() <<
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180 msg_info(av_error_str(errn)) <<
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181 boost::errinfo_api_function("avcodec_decode_video") <<
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182 boost::errinfo_errno(AVUNERROR(errn)));
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185 if(frame_finished != 0)
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186 av_frames.push_back(make_safe(decoded_frame));
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188 return frame_finished != 0;
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193 return !codec_context_ || !packet_buffer_.empty();
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196 core::video_mode::type mode()
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198 if(!codec_context_)
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199 return frame_factory_->get_video_format_desc().mode;
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210 video_decoder::video_decoder(const std::shared_ptr<AVFormatContext>& context, const safe_ptr<core::frame_factory>& frame_factory, const std::wstring& filter) : impl_(new implementation(context, frame_factory, filter)){}
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211 void video_decoder::push(const std::shared_ptr<AVPacket>& packet){impl_->push(packet);}
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212 std::vector<std::shared_ptr<core::write_frame>> video_decoder::poll(){return impl_->poll();}
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213 bool video_decoder::ready() const{return impl_->ready();}
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214 core::video_mode::type video_decoder::mode(){return impl_->mode();}
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215 double video_decoder::fps() const{return impl_->fps();}
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