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Adds support for property CV_CAP_PROP_FOCUS in functions cvSetCaptureProperty and cvGetCaptureProperty.

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In compliance with the Windows (DirectDraw) version autofocus is disabled when either of the abovementioned functions is called.
This commit is contained in:
Anton V. Shokurov 2015-07-18 15:24:16 +03:00
parent 0726c4d4ea
commit 4691d98e19
1 changed files with 45 additions and 0 deletions
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45
modules/videoio/src/cap_libv4l.cpp
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@ -1433,6 +1433,30 @@ static double icvGetPropertyCAM_V4L (CvCaptureCAM_V4L* capture,
sprintf(name, "Exposure");
capture->control.id = V4L2_CID_EXPOSURE;
break;
case CV_CAP_PROP_FOCUS: {
struct v4l2_control c;
int v4l2_min;
int v4l2_max;
//we need to make sure that the autofocus is switch off, if available.
capture->control.id = V4L2_CID_FOCUS_AUTO;
v4l2_min = v4l2_get_ctrl_min(capture, capture->control.id);
v4l2_max = v4l2_get_ctrl_max(capture, capture->control.id);
if ( !((v4l2_min == -1) && (v4l2_max == -1)) ) {
//autofocus capability is supported, switch it off.
c.id = capture->control.id;
c.value = 0;//off
if( v4l2_ioctl(capture->deviceHandle, VIDIOC_S_CTRL, &c) != 0 ){
if (errno != ERANGE) {
fprintf(stderr, "VIDEOIO ERROR: V4L2: Failed to set control \"%d\"(FOCUS_AUTO): %s (value %d)\n", c.id, strerror(errno), c.value);
return -1;
}
}
}//lack of support should not be considerred an error.
sprintf(name, "Focus");
capture->control.id = V4L2_CID_FOCUS_ABSOLUTE;
break;
}
default:
sprintf(name, "<unknown property string>");
capture->control.id = property_id;
@ -1650,6 +1674,27 @@ static int icvSetControl (CvCaptureCAM_V4L* capture, int property_id, double val
sprintf(name, "Exposure");
capture->control.id = V4L2_CID_EXPOSURE;
break;
case CV_CAP_PROP_FOCUS:
//we need to make sure that the autofocus is switch off, if available.
capture->control.id = V4L2_CID_FOCUS_AUTO;
v4l2_min = v4l2_get_ctrl_min(capture, capture->control.id);
v4l2_max = v4l2_get_ctrl_max(capture, capture->control.id);
if ( !((v4l2_min == -1) && (v4l2_max == -1)) ) {
//autofocus capability is supported, switch it off.
c.id = capture->control.id;
c.value = 0;//off
if( v4l2_ioctl(capture->deviceHandle, VIDIOC_S_CTRL, &c) != 0 ){
if (errno != ERANGE) {
fprintf(stderr, "VIDEOIO ERROR: V4L2: Failed to set control \"%d\"(FOCUS_AUTO): %s (value %d)\n", c.id, strerror(errno), c.value);
return -1;
}
}
}//lack of support should not be considerred an error.
//now set the manual focus
sprintf(name, "Focus");
capture->control.id = V4L2_CID_FOCUS_ABSOLUTE;
break;
default:
sprintf(name, "<unknown property string>");
capture->control.id = property_id;