git.sesse.net Git - casparcg/blob - modules/ffmpeg/producer/video/video_decoder.cpp

   1 /*
   2 * Copyright (c) 2011 Sveriges Television AB <info@casparcg.com>
   3 *
   4 * This file is part of CasparCG (www.casparcg.com).
   5 *
   6 * CasparCG is free software: you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation, either version 3 of the License, or
   9 * (at your option) any later version.
  10 *
  11 * CasparCG is distributed in the hope that it will be useful,
  12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 * GNU General Public License for more details.
  15 *
  16 * You should have received a copy of the GNU General Public License
  17 * along with CasparCG. If not, see <http://www.gnu.org/licenses/>.
  18 *
  19 * Author: Robert Nagy, ronag89@gmail.com
  20 */
  21
  22 #include "../../StdAfx.h"
  23
  24 #include "video_decoder.h"
  25
  26 #include "../util/util.h"
  27 #include "../input/input.h"
  28
  29 #include "../../ffmpeg_error.h"
  30
  31 #include <common/log.h>
  32 #include <core/frame/frame_transform.h>
  33 #include <core/frame/frame_factory.h>
  34
  35 #include <boost/filesystem.hpp>
  36
  37 #include <queue>
  38
  39 #if defined(_MSC_VER)
  40 #pragma warning (push)
  41 #pragma warning (disable : 4244)
  42 #endif
  43 extern "C"
  44 {
  45         #include <libavcodec/avcodec.h>
  46         #include <libavformat/avformat.h>
  47 }
  48 #if defined(_MSC_VER)
  49 #pragma warning (pop)
  50 #endif
  51
  52 namespace caspar { namespace ffmpeg {
  53
  54 struct video_decoder::impl : boost::noncopyable
  55 {
  56         core::monitor::subject                                  monitor_subject_;
  57         input*                                                                  input_;
  58         int                                                                             index_                          = -1;
  59         const spl::shared_ptr<AVCodecContext>   codec_context_;
  60
  61         std::queue<spl::shared_ptr<AVPacket>>   packets_;
  62
  63         const AVStream*                                                 stream_;
  64         const uint32_t                                                  nb_frames_;
  65         const int                                                               width_;
  66         const int                                                               height_;
  67
  68         bool                                                                    is_progressive_;
  69         uint32_t                                                                file_frame_number_;
  70         boost::rational<int>                                    framerate_;
  71
  72         std::shared_ptr<AVPacket>                               current_packet_;
  73
  74 public:
  75         explicit impl(input& in, bool single_threaded)
  76                 : input_(&in)
  77                 , codec_context_(open_codec(input_->context(), AVMEDIA_TYPE_VIDEO, index_, single_threaded))
  78                 , stream_(input_->context().streams[index_])
  79                 , nb_frames_(static_cast<uint32_t>(stream_->nb_frames))
  80                 , width_(codec_context_->width)
  81                 , height_(codec_context_->height)
  82                 , file_frame_number_(0)
  83                 , framerate_(read_framerate(input_->context(), 0))
  84         {
  85         }
  86
  87         std::shared_ptr<AVFrame> poll()
  88         {
  89                 if(!current_packet_ && !input_->try_pop_video(current_packet_))
  90                         return nullptr;
  91
  92                 std::shared_ptr<AVFrame> frame;
  93
  94                 if(!current_packet_)
  95                 {
  96                         avcodec_flush_buffers(codec_context_.get());
  97                 }
  98                 else if(!current_packet_->data)
  99                 {
 100                         if(codec_context_->codec->capabilities & CODEC_CAP_DELAY)
 101                                 frame = decode(*current_packet_);
 102
 103                         if(!frame)
 104                                 current_packet_.reset();
 105                 }
 106                 else
 107                 {
 108                         frame = decode(*current_packet_);
 109
 110                         if(current_packet_->size == 0)
 111                                 current_packet_.reset();
 112                 }
 113
 114                 return frame;
 115         }
 116
 117         std::shared_ptr<AVFrame> decode(AVPacket& pkt)
 118         {
 119                 auto frame = create_frame();
 120
 121                 int got_frame = 0;
 122                 auto len = THROW_ON_ERROR2(avcodec_decode_video2(codec_context_.get(), frame.get(), &got_frame, &pkt), "[video_decocer]");
 123
 124                 if(len == 0)
 125                 {
 126                         pkt.size = 0;
 127                         return nullptr;
 128                 }
 129
 130         pkt.data += len;
 131         pkt.size -= len;
 132
 133                 if(got_frame == 0)
 134                         return nullptr;
 135
 136                 auto stream_time_base           = stream_->time_base;
 137                 auto fps = static_cast<double>(framerate_.numerator()) / static_cast<double>(framerate_.denominator());
 138                 auto packet_frame_number        = static_cast<uint32_t>((static_cast<double>(pkt.pts * stream_time_base.num) / stream_time_base.den) * fps);
 139
 140                 file_frame_number_ = packet_frame_number;
 141
 142                 is_progressive_ = !frame->interlaced_frame;
 143
 144                 if(frame->repeat_pict > 0)
 145                         CASPAR_LOG(warning) << "[video_decoder] repeat_pict not implemented.";
 146
 147                 monitor_subject_  << core::monitor::message("/file/video/width")        % width_
 148                                                 << core::monitor::message("/file/video/height") % height_
 149                                                 << core::monitor::message("/file/video/field")  % u8(!frame->interlaced_frame ? "progressive" : (frame->top_field_first ? "upper" : "lower"))
 150                                                 << core::monitor::message("/file/video/codec")  % u8(codec_context_->codec->long_name);
 151
 152                 return frame;
 153         }
 154
 155         uint32_t nb_frames() const
 156         {
 157                 return std::max(nb_frames_, file_frame_number_);
 158         }
 159
 160         std::wstring print() const
 161         {
 162                 return L"[video-decoder] " + u16(codec_context_->codec->long_name);
 163         }
 164 };
 165
 166 video_decoder::video_decoder(input& in, bool single_threaded) : impl_(new impl(in, single_threaded)){}
 167 video_decoder::video_decoder(video_decoder&& other) : impl_(std::move(other.impl_)){}
 168 video_decoder& video_decoder::operator=(video_decoder&& other){impl_ = std::move(other.impl_); return *this;}
 169 std::shared_ptr<AVFrame> video_decoder::operator()(){return impl_->poll();}
 170 int video_decoder::width() const{return impl_->width_;}
 171 int video_decoder::height() const{return impl_->height_;}
 172 uint32_t video_decoder::nb_frames() const{return impl_->nb_frames();}
 173 uint32_t video_decoder::file_frame_number() const{return impl_->file_frame_number_;}
 174 boost::rational<int> video_decoder::framerate() const { return impl_->framerate_; }
 175 bool video_decoder::is_progressive() const{return impl_->is_progressive_;}
 176 std::wstring video_decoder::print() const{return impl_->print();}
 177 core::monitor::subject& video_decoder::monitor_output() { return impl_->monitor_subject_; }
 178 }}