cap_mjpeg_decoder.cpp
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/*M///////////////////////////////////////////////////////////////////////////////////////
//
// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
// By downloading, copying, installing or using the software you agree to this license.
// If you do not agree to this license, do not download, install,
// copy or use the software.
//
//
// License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2015, OpenCV Foundation, all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistribution's of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistribution's in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * The name of Intel Corporation may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/
#include "precomp.hpp"
#include "opencv2/videoio/container_avi.private.hpp"
namespace cv
{
class MotionJpegCapture: public IVideoCapture
{
public:
virtual ~MotionJpegCapture() CV_OVERRIDE;
virtual double getProperty(int) const CV_OVERRIDE;
virtual bool setProperty(int, double) CV_OVERRIDE;
virtual bool grabFrame() CV_OVERRIDE;
virtual bool retrieveFrame(int, OutputArray) CV_OVERRIDE;
virtual bool isOpened() const CV_OVERRIDE;
virtual int getCaptureDomain() CV_OVERRIDE { return CAP_OPENCV_MJPEG; }
MotionJpegCapture(const String&);
bool open(const String&);
void close();
protected:
inline uint64_t getFramePos() const;
Ptr<AVIReadContainer> m_avi_container;
bool m_is_first_frame;
frame_list m_mjpeg_frames;
frame_iterator m_frame_iterator;
Mat m_current_frame;
//frame width/height and fps could be different for
//each frame/stream. At the moment we suppose that they
//stays the same within single avi file.
uint32_t m_frame_width;
uint32_t m_frame_height;
double m_fps;
};
uint64_t MotionJpegCapture::getFramePos() const
{
if(m_is_first_frame)
return 0;
if(m_frame_iterator == m_mjpeg_frames.end())
return m_mjpeg_frames.size();
return m_frame_iterator - m_mjpeg_frames.begin() + 1;
}
bool MotionJpegCapture::setProperty(int property, double value)
{
if(property == CAP_PROP_POS_FRAMES)
{
if(int(value) == 0)
{
m_is_first_frame = true;
m_frame_iterator = m_mjpeg_frames.end();
return true;
}
else if(m_mjpeg_frames.size() > value)
{
m_frame_iterator = m_mjpeg_frames.begin() + int(value - 1);
m_is_first_frame = false;
return true;
}
}
return false;
}
double MotionJpegCapture::getProperty(int property) const
{
switch(property)
{
case CAP_PROP_POS_FRAMES:
return (double)getFramePos();
case CAP_PROP_POS_MSEC:
return (double)getFramePos() * (1000. / m_fps);
case CAP_PROP_POS_AVI_RATIO:
return double(getFramePos())/m_mjpeg_frames.size();
case CAP_PROP_FRAME_WIDTH:
return (double)m_frame_width;
case CAP_PROP_FRAME_HEIGHT:
return (double)m_frame_height;
case CAP_PROP_FPS:
return m_fps;
case CAP_PROP_FOURCC:
return (double)CV_FOURCC('M','J','P','G');
case CAP_PROP_FRAME_COUNT:
return (double)m_mjpeg_frames.size();
case CAP_PROP_FORMAT:
return 0;
default:
return 0;
}
}
bool MotionJpegCapture::grabFrame()
{
if(isOpened())
{
if(m_is_first_frame)
{
m_is_first_frame = false;
m_frame_iterator = m_mjpeg_frames.begin();
}
else
{
if (m_frame_iterator == m_mjpeg_frames.end())
return false;
++m_frame_iterator;
}
}
return m_frame_iterator != m_mjpeg_frames.end();
}
bool MotionJpegCapture::retrieveFrame(int, OutputArray output_frame)
{
if(m_frame_iterator != m_mjpeg_frames.end())
{
std::vector<char> data = m_avi_container->readFrame(m_frame_iterator);
if(data.size())
{
m_current_frame = imdecode(data, IMREAD_ANYDEPTH | IMREAD_COLOR | IMREAD_IGNORE_ORIENTATION);
}
m_current_frame.copyTo(output_frame);
return true;
}
return false;
}
MotionJpegCapture::~MotionJpegCapture()
{
close();
}
MotionJpegCapture::MotionJpegCapture(const String& filename)
{
m_avi_container = makePtr<AVIReadContainer>();
m_avi_container->initStream(filename);
open(filename);
}
bool MotionJpegCapture::isOpened() const
{
return m_mjpeg_frames.size() > 0;
}
void MotionJpegCapture::close()
{
m_avi_container->close();
m_frame_iterator = m_mjpeg_frames.end();
}
bool MotionJpegCapture::open(const String& filename)
{
close();
m_avi_container = makePtr<AVIReadContainer>();
m_avi_container->initStream(filename);
m_frame_iterator = m_mjpeg_frames.end();
m_is_first_frame = true;
if(!m_avi_container->parseRiff(m_mjpeg_frames))
{
close();
} else
{
m_frame_width = m_avi_container->getWidth();
m_frame_height = m_avi_container->getHeight();
m_fps = m_avi_container->getFps();
}
return isOpened();
}
Ptr<IVideoCapture> createMotionJpegCapture(const String& filename)
{
Ptr<MotionJpegCapture> mjdecoder(new MotionJpegCapture(filename));
if( mjdecoder->isOpened() )
return mjdecoder;
return Ptr<MotionJpegCapture>();
}
}