mirror of
https://github.com/ruby-opencv/ruby-opencv
synced 2023-03-27 23:22:12 -04:00
276 lines
7.8 KiB
C++
276 lines
7.8 KiB
C++
/************************************************************
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cvcapture.cpp -
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$Author: lsxi $
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Copyright (C) 2005-2006 Masakazu Yonekura
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************************************************************/
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#include"cvcapture.h"
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/*
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* Document-class: OpenCV::CvCapture
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*
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* Capture image from video stream.
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*
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*/
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__NAMESPACE_BEGIN_OPENCV
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__NAMESPACE_BEGIN_CVCAPTURE
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VALUE rb_klass;
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VALUE
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rb_class()
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{
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return rb_klass;
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}
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void
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define_ruby_class()
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{
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if (rb_klass)
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return;
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/*
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* opencv = rb_define_module("OpenCV");
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*
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* note: this comment is used by rdoc.
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*/
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VALUE opencv = rb_module_opencv();
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rb_klass = rb_define_class_under(opencv, "CvCapture", rb_cData);
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VALUE video_interface = rb_hash_new();
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/* {:any, :mil, :vfw, :v4l, :v4l2, :fireware, :ieee1394, :dc1394, :cmu1394, :stereo, :tyzx, :tyzx_left, :tyzx_right, :tyzx_color, :tyzx_z, :qt, :qtuicktime}: video source */
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rb_define_const(rb_klass, "INTERFACE", video_interface);
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rb_hash_aset(video_interface, ID2SYM(rb_intern("any")), INT2FIX(CV_CAP_ANY));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("mil")), INT2FIX(CV_CAP_MIL));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("vfw")), INT2FIX(CV_CAP_VFW));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("v4l")), INT2FIX(CV_CAP_V4L));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("v4l2")), INT2FIX(CV_CAP_V4L2));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("fireware")), INT2FIX(CV_CAP_FIREWARE));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("ieee1394")), INT2FIX(CV_CAP_IEEE1394));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("dc1394")), INT2FIX(CV_CAP_DC1394));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("cmu1394")), INT2FIX(CV_CAP_CMU1394));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("stereo")), INT2FIX(CV_CAP_STEREO));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("tyzx")), INT2FIX(CV_CAP_TYZX));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("tyzx_left")), INT2FIX(CV_TYZX_LEFT));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("tyzx_right")), INT2FIX(CV_TYZX_RIGHT));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("tyzx_color")), INT2FIX(CV_TYZX_COLOR));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("tyzx_z")), INT2FIX(CV_TYZX_Z));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("qt")), INT2FIX(CV_CAP_QT));
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rb_hash_aset(video_interface, ID2SYM(rb_intern("quicktime")), INT2FIX(CV_CAP_QT));
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rb_define_singleton_method(rb_klass, "open", RUBY_METHOD_FUNC(rb_open), -1);
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rb_define_method(rb_klass, "grab", RUBY_METHOD_FUNC(rb_grab), 0);
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rb_define_method(rb_klass, "retrieve", RUBY_METHOD_FUNC(rb_retrieve), 0);
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rb_define_method(rb_klass, "query", RUBY_METHOD_FUNC(rb_query), 0);
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rb_define_method(rb_klass, "millisecond", RUBY_METHOD_FUNC(rb_millisecond), 0);
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rb_define_method(rb_klass, "frames", RUBY_METHOD_FUNC(rb_frames), 0);
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rb_define_method(rb_klass, "size", RUBY_METHOD_FUNC(rb_size), 0);
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rb_define_method(rb_klass, "width", RUBY_METHOD_FUNC(rb_width), 0);
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rb_define_method(rb_klass, "height", RUBY_METHOD_FUNC(rb_height), 0);
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rb_define_method(rb_klass, "fps", RUBY_METHOD_FUNC(rb_fps), 0);
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rb_define_method(rb_klass, "fourcc", RUBY_METHOD_FUNC(rb_fourcc), 0);
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rb_define_method(rb_klass, "frame_count", RUBY_METHOD_FUNC(rb_frame_count), 0);
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}
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void
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free(void *ptr)
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{
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if(ptr)
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cvReleaseCapture((CvCapture**)&ptr);
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}
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/*
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* call-seq:
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* CvCapture.open(<i>[dev = -1]</i>)
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*
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* Reading video stream from the specified file or camera device.
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* If <i>dev</i> is string (i.e "stream.avi"), reading video stream from file.
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* If <i>dev</i> is number or symbol(include CvCapture::INTERFACE),
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* reading video stream from camera.
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* Currently two camera interfaces can be used on Windows:
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* * Video for Windows(VFW)
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* * Matrox Imaging Library(MIL)
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* and two on Linux
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* * V4L
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* * FireWire(IEEE1394).
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* If there is only one camera or it does not matter what camera to use <i>nil</i> may be passed.
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*/
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VALUE
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rb_open(int argc, VALUE *argv, VALUE self)
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{
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VALUE device, i;
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rb_scan_args(argc, argv, "01", &device);
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CvCapture *capture = 0;
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switch (TYPE(device)) {
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case T_STRING:
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capture = cvCaptureFromFile(StringValueCStr(device));
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break;
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case T_FIXNUM:
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capture = cvCaptureFromCAM(FIX2INT(device));
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break;
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case T_SYMBOL:
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i = rb_hash_aref(rb_const_get(rb_class(), rb_intern("INTERFACE")), device);
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if (NIL_P(i))
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rb_raise(rb_eArgError, "undefined interface.");
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capture = cvCaptureFromCAM(NUM2INT(i));
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break;
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case T_NIL:
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capture = cvCaptureFromCAM(CV_CAP_ANY);
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break;
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}
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if (!capture)
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rb_raise(rb_eStandardError, "Invalid capture format.");
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return Data_Wrap_Struct(rb_klass, 0, free, capture);
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}
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/*
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* call-seq:
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* grab -> true or false
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*
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* Grabbed frame is stored internally. To grab frame
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* <i>fast</i> that is important for syncronization in case of reading from
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* several cameras simultaneously. The grabbed frames are not exposed because
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* they may be stored in compressed format (as defined by camera/driver).
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* To retrieve the grabbed frame, retrieve should be used.
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*
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* If grabbed frame was success, return true. Otherwise return false.
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*/
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VALUE
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rb_grab(VALUE self)
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{
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return cvGrabFrame(CVCAPTURE(self)) ? Qtrue : Qfalse;
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}
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/*
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* call-seq:
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* retrieve -> CvMat or nil
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*
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* Gets the image grabbed with grab.
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*/
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VALUE
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rb_retrieve(VALUE self)
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{
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IplImage *frame = cvRetrieveFrame(CVCAPTURE(self));
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if(!frame)
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return Qnil;
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VALUE image = cIplImage::new_object(cvSize(frame->width, frame->height), CV_MAKETYPE(CV_8U, frame->nChannels));
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if (frame->origin == IPL_ORIGIN_TL) {
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cvCopy(frame, CVARR(image));
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} else {
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cvFlip(frame, CVARR(image));
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}
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return image;
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}
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/*
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* call-seq:
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* query -> CvMat or nil
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*
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* Grabs and returns a frame camera or file. Just a combination of grab and retrieve in one call.
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*/
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VALUE
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rb_query(VALUE self)
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{
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IplImage *frame = cvQueryFrame(CVCAPTURE(self));
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if(!frame)
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return Qnil;
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VALUE image = cIplImage::new_object(cvSize(frame->width, frame->height), CV_MAKETYPE(CV_8U, frame->nChannels));
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if (frame->origin == IPL_ORIGIN_TL) {
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cvCopy(frame, CVARR(image));
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} else {
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cvFlip(frame, CVARR(image));
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}
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return image;
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}
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/*
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* Film current position in milliseconds or video capture timestamp.
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*/
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VALUE
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rb_millisecond(VALUE self)
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{
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return rb_dbl2big(cvGetCaptureProperty(CVCAPTURE(self), CV_CAP_PROP_POS_MSEC));
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}
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/*
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* 0-based index of the frame to be decoded/captured next
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*/
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VALUE
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rb_frames(VALUE self)
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{
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return rb_float_new(cvGetCaptureProperty(CVCAPTURE(self), CV_CAP_PROP_POS_FRAMES));
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}
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/*
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* Relative position of video file (0 - start of the film, 1 - end of the film)
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*/
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VALUE
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rb_avi_ratio(VALUE self)
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{
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return rb_float_new(cvGetCaptureProperty(CVCAPTURE(self), CV_CAP_PROP_POS_AVI_RATIO));
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}
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/*
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* Size of frames in the video stream.
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*/
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VALUE
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rb_size(VALUE self)
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{
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return cCvSize::new_object(cvSize((int)cvGetCaptureProperty(CVCAPTURE(self), CV_CAP_PROP_FRAME_WIDTH), (int)cvGetCaptureProperty(CVCAPTURE(self), CV_CAP_PROP_FRAME_HEIGHT)));
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}
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/*
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* Width of frames in the video stream.
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*/
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VALUE
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rb_width(VALUE self)
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{
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return rb_dbl2big(cvGetCaptureProperty(CVCAPTURE(self), CV_CAP_PROP_FRAME_WIDTH));
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}
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/*
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* Height of frames in the video stream.
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*/
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VALUE
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rb_height(VALUE self)
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{
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return rb_dbl2big(cvGetCaptureProperty(CVCAPTURE(self), CV_CAP_PROP_FRAME_HEIGHT));
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}
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/*
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* Frame rate
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*/
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VALUE
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rb_fps(VALUE self)
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{
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return rb_dbl2big(cvGetCaptureProperty(CVCAPTURE(self), CV_CAP_PROP_FPS));
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}
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/*
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* 4character code of codec. see http://www.fourcc.org/
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*/
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VALUE
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rb_fourcc(VALUE self)
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{
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char str[4];
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double fourcc = cvGetCaptureProperty(CVCAPTURE(self), CV_CAP_PROP_FOURCC);
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sprintf(str, "%s", (char*)&fourcc);
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return rb_str_new2(str);
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}
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/*
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* Number of frames in video file.
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*/
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VALUE
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rb_frame_count(VALUE self)
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{
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return rb_dbl2big(cvGetCaptureProperty(CVCAPTURE(self), CV_CAP_PROP_FRAME_COUNT));
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}
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__NAMESPACE_END_CVCAPTURE
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__NAMESPACE_END_OPENCV
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