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Exposure and autofocus properties fixed/added.

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Exposure can now be manually controlled (implemented only in libv4l).
Will work only with a kernel version >= 4.5.
Autofocus can be enabled/disabled.
pull/5516/head
Anton V. Shokurov 10 years ago
parent dfec99691b
commit b9b40a73ba
1 changed files with 36 additions and 38 deletions
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  1. 74
      modules/videoio/src/cap_libv4l.cpp

74
modules/videoio/src/cap_libv4l.cpp
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@ -1352,6 +1352,29 @@ static IplImage* icvRetrieveFrameCAM_V4L( CvCaptureCAM_V4L* capture, int) {
return(&capture->frame);
}
static int zeroPropertyQuietly(CvCaptureCAM_V4L* capture, int property_id, int value)
{
struct v4l2_control c;
int v4l2_min;
int v4l2_max;
//we need to make sure that the autocontrol is switch off, if available.
capture->control.id = property_id;
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)) ) {
//autocontrol capability is supported, switch it off.
c.id = capture->control.id;
c.value = value;
if( v4l2_ioctl(capture->deviceHandle, VIDIOC_S_CTRL, &c) != 0 ){
if (errno != ERANGE) {
fprintf(stderr, "VIDEOIO ERROR: V4L2: Failed to set autocontrol \"%d\": %s (value %d)\n", c.id, strerror(errno), c.value);
return -1;
}
}
}//lack of support should not be considerred an error.
return 0;
}
/* TODO: review this adaptation */
static double icvGetPropertyCAM_V4L (CvCaptureCAM_V4L* capture,
int property_id ) {
@ -1431,32 +1454,15 @@ static double icvGetPropertyCAM_V4L (CvCaptureCAM_V4L* capture,
break;
case CV_CAP_PROP_EXPOSURE:
sprintf(name, "Exposure");
capture->control.id = V4L2_CID_EXPOSURE;
capture->control.id = V4L2_CID_EXPOSURE_ABSOLUTE;
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.
case CV_CAP_PROP_FOCUS:
sprintf(name, "Focus");
capture->control.id = V4L2_CID_FOCUS_ABSOLUTE;
break;
}
case CV_CAP_PROP_AUTOFOCUS:
sprintf(name, "Autofocus");
capture->control.id = V4L2_CID_FOCUS_AUTO;
default:
sprintf(name, "<unknown property string>");
capture->control.id = property_id;
@ -1671,30 +1677,22 @@ static int icvSetControl (CvCaptureCAM_V4L* capture, int property_id, double val
capture->control.id = V4L2_CID_GAIN;
break;
case CV_CAP_PROP_EXPOSURE:
//we need to make sure that the autoexposure is switch off, if available.
zeroPropertyQuietly(capture, V4L2_CID_EXPOSURE_AUTO, V4L2_EXPOSURE_MANUAL);
//now get the manual exposure value
sprintf(name, "Exposure");
capture->control.id = V4L2_CID_EXPOSURE;
capture->control.id = V4L2_CID_EXPOSURE_ABSOLUTE;
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.
zeroPropertyQuietly(capture, V4L2_CID_FOCUS_AUTO, 0 /*off*/);
//now set the manual focus
sprintf(name, "Focus");
capture->control.id = V4L2_CID_FOCUS_ABSOLUTE;
break;
case CV_CAP_PROP_AUTOFOCUS:
sprintf(name, "Autofocus");
capture->control.id = V4L2_CID_FOCUS_AUTO;
default:
sprintf(name, "<unknown property string>");
capture->control.id = property_id;

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