added self-contained motion jpeg encoder (filename should end with .avi; fourcc should be "MJPG"

modules/videoio/CMakeLists.txt

@@ -27,6 +27,8 @@ set(videoio_hdrs
 set(videoio_srcs
     ${CMAKE_CURRENT_LIST_DIR}/src/cap.cpp
     ${CMAKE_CURRENT_LIST_DIR}/src/cap_images.cpp
+    ${CMAKE_CURRENT_LIST_DIR}/src/cap_mjpeg_encoder.cpp
+    ${CMAKE_CURRENT_LIST_DIR}/src/cap_mjpeg_decoder.cpp
     )
 
 file(GLOB videoio_ext_hdrs

modules/videoio/include/opencv2/videoio.hpp

@@ -586,10 +586,10 @@ public:
 protected:
     Ptr<CvCapture> cap;
     Ptr<IVideoCapture> icap;
-private:
-    static Ptr<IVideoCapture> createCameraCapture(int index);
 };
 
+class IVideoWriter;
+
 /** @brief Video writer class.
  */
 class CV_EXPORTS_W VideoWriter
@@ -651,6 +651,10 @@ public:
 
 protected:
     Ptr<CvVideoWriter> writer;
+    Ptr<IVideoWriter> iwriter;
+
+    static Ptr<IVideoWriter> create(const String& filename, int fourcc, double fps,
+                                    Size frameSize, bool isColor = true);
 };
 
 template<> CV_EXPORTS void DefaultDeleter<CvCapture>::operator ()(CvCapture* obj) const;

modules/videoio/src/cap.cpp

@@ -499,6 +499,67 @@ CV_IMPL void cvReleaseVideoWriter( CvVideoWriter** pwriter )
 namespace cv
 {
 
+static Ptr<IVideoCapture> IVideoCapture_create(int index)
+{
+    int  domains[] =
+    {
+#ifdef HAVE_DSHOW
+        CV_CAP_DSHOW,
+#endif
+#ifdef HAVE_INTELPERC
+        CV_CAP_INTELPERC,
+#endif
+        -1, -1
+    };
+
+    // interpret preferred interface (0 = autodetect)
+    int pref = (index / 100) * 100;
+    if (pref)
+    {
+        domains[0]=pref;
+        index %= 100;
+        domains[1]=-1;
+    }
+
+    // try every possibly installed camera API
+    for (int i = 0; domains[i] >= 0; i++)
+    {
+#if defined(HAVE_DSHOW)        || \
+    defined(HAVE_INTELPERC)    || \
+    (0)
+        Ptr<IVideoCapture> capture;
+
+        switch (domains[i])
+        {
+#ifdef HAVE_DSHOW
+            case CV_CAP_DSHOW:
+                capture = makePtr<VideoCapture_DShow>(index);
+                break; // CV_CAP_DSHOW
+#endif
+#ifdef HAVE_INTELPERC
+            case CV_CAP_INTELPERC:
+                capture = makePtr<VideoCapture_IntelPerC>();
+                break; // CV_CAP_INTEL_PERC
+#endif
+        }
+        if (capture && capture->isOpened())
+            return capture;
+#endif
+    }
+
+    // failed open a camera
+    return Ptr<IVideoCapture>();
+}
+
+
+static Ptr<IVideoWriter> IVideoWriter_create(const String& filename, int _fourcc, double fps, Size frameSize, bool isColor)
+{
+    Ptr<IVideoWriter> iwriter;
+    if( _fourcc == CV_FOURCC('M', 'J', 'P', 'G') )
+        iwriter = createMotionJpegWriter(filename, fps, frameSize, isColor);
+    return iwriter;
+}
+
 VideoCapture::VideoCapture()
 {}
 
@@ -528,7 +589,7 @@ bool VideoCapture::open(const String& filename)
 bool VideoCapture::open(int device)
 {
     if (isOpened()) release();
-    icap = createCameraCapture(device);
+    icap = IVideoCapture_create(device);
     if (!icap.empty())
         return true;
     cap.reset(cvCreateCameraCapture(device));
@@ -609,59 +670,6 @@ double VideoCapture::get(int propId) const
     return icvGetCaptureProperty(cap, propId);
 }
 
-Ptr<IVideoCapture> VideoCapture::createCameraCapture(int index)
-{
-    int  domains[] =
-    {
-#ifdef HAVE_DSHOW
-        CV_CAP_DSHOW,
-#endif
-#ifdef HAVE_INTELPERC
-        CV_CAP_INTELPERC,
-#endif
-        -1, -1
-    };
-
-    // interpret preferred interface (0 = autodetect)
-    int pref = (index / 100) * 100;
-    if (pref)
-    {
-        domains[0]=pref;
-        index %= 100;
-        domains[1]=-1;
-    }
-
-    // try every possibly installed camera API
-    for (int i = 0; domains[i] >= 0; i++)
-    {
-#if defined(HAVE_DSHOW)        || \
-    defined(HAVE_INTELPERC)    || \
-    (0)
-        Ptr<IVideoCapture> capture;
-
-        switch (domains[i])
-        {
-#ifdef HAVE_DSHOW
-        case CV_CAP_DSHOW:
-            capture = makePtr<VideoCapture_DShow>(index);
-            if (capture && capture.dynamicCast<VideoCapture_DShow>()->isOpened())
-                return capture;
-            break; // CV_CAP_DSHOW
-#endif
-#ifdef HAVE_INTELPERC
-        case CV_CAP_INTELPERC:
-            capture = makePtr<VideoCapture_IntelPerC>();
-            if (capture && capture.dynamicCast<VideoCapture_IntelPerC>()->isOpened())
-                return capture;
-            break; // CV_CAP_INTEL_PERC
-#endif
-        }
-#endif
-    }
-
-    // failed open a camera
-    return Ptr<IVideoCapture>();
-}
 
 VideoWriter::VideoWriter()
 {}
@@ -673,6 +681,7 @@ VideoWriter::VideoWriter(const String& filename, int _fourcc, double fps, Size f
 
 void VideoWriter::release()
 {
+    iwriter.release();
     writer.release();
 }
 
@@ -683,19 +692,28 @@ VideoWriter::~VideoWriter()
 
 bool VideoWriter::open(const String& filename, int _fourcc, double fps, Size frameSize, bool isColor)
 {
+    if (isOpened()) release();
+    iwriter = IVideoWriter_create(filename, _fourcc, fps, frameSize, isColor);
+    if (!iwriter.empty())
+        return true;
     writer.reset(cvCreateVideoWriter(filename.c_str(), _fourcc, fps, frameSize, isColor));
     return isOpened();
 }
 
 bool VideoWriter::isOpened() const
 {
-    return !writer.empty();
+    return !iwriter.empty() || !writer.empty();
 }
 
 void VideoWriter::write(const Mat& image)
 {
-    IplImage _img = image;
+    if( iwriter )
-    cvWriteFrame(writer, &_img);
+        iwriter->write(image);
+    else
+    {
+        IplImage _img = image;
+        cvWriteFrame(writer, &_img);
+    }
 }
 
 VideoWriter& VideoWriter::operator << (const Mat& image)

modules/videoio/src/cap_dshow.hpp

@@ -32,7 +32,7 @@ public:
     virtual bool grabFrame();
     virtual bool retrieveFrame(int outputType, OutputArray frame);
     virtual int getCaptureDomain();
-    bool isOpened() const;
+    virtual bool isOpened() const;
 protected:
     void open(int index);
     void close();

modules/videoio/src/cap_intelperc.hpp

@@ -100,7 +100,7 @@ public:
     virtual bool grabFrame();
     virtual bool retrieveFrame(int outputType, OutputArray frame);
     virtual int getCaptureDomain();
-    bool isOpened() const;
+    virtual bool isOpened() const;
 protected:
     bool m_contextOpened;
 

modules/videoio/src/cap_mjpeg_decoder.cpp

@@ -0,0 +1,52 @@
+/*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"
+
+namespace cv
+{
+
+Ptr<IVideoCapture> createMotionJpegCapture(const String& filename)
+{
+    return Ptr<IVideoCapture>();
+}
+
+}

modules/videoio/src/precomp.hpp

@@ -168,9 +168,24 @@ namespace cv
         virtual double getProperty(int) const { return 0; }
         virtual bool setProperty(int, double) { return 0; }
         virtual bool grabFrame() = 0;
-        virtual bool retrieveFrame(int, cv::OutputArray) = 0;
+        virtual bool retrieveFrame(int, OutputArray) = 0;
+        virtual bool isOpened() const = 0;
         virtual int getCaptureDomain() { return CAP_ANY; } // Return the type of the capture object: CAP_VFW, etc...
     };
+
+    class IVideoWriter
+    {
+    public:
+        virtual ~IVideoWriter() {}
+        virtual double getProperty(int) const { return 0; }
+        virtual bool setProperty(int, double) { return 0; }
+
+        virtual bool isOpened() const = 0;
+        virtual void write(InputArray) = 0;
+    };
+
+    Ptr<IVideoCapture> createMotionJpegCapture(const String& filename);
+    Ptr<IVideoWriter> createMotionJpegWriter( const String& filename, double fps, Size frameSize, bool iscolor );
 };
 
 #endif /* __VIDEOIO_H_ */