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cap_v4l: allow manually controlling exposure

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This commit is contained in:
Pavel Rojtberg 2016-04-12 12:10:54 +02:00
parent 2f0676fb88
commit 91678ff828
1 changed files with 16 additions and 2 deletions
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18
modules/videoio/src/cap_v4l.cpp
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@ -322,6 +322,8 @@ struct CvCaptureCAM_V4L : public CvCapture
return focus;
case CV_CAP_PROP_AUTOFOCUS:
return Range(0, 1);
case CV_CAP_PROP_AUTO_EXPOSURE:
return Range(0, 4);
default:
return Range(0, 255);
}
@ -512,7 +514,7 @@ static void v4l2_control_range(CvCaptureCAM_V4L* cap, __u32 id)
case V4L2_CID_GAIN:
cap->gain = range;
break;
case V4L2_CID_EXPOSURE:
case V4L2_CID_EXPOSURE_ABSOLUTE:
cap->exposure = range;
break;
case V4L2_CID_FOCUS_ABSOLUTE:
@ -1557,8 +1559,10 @@ static inline __u32 capPropertyToV4L2(int prop) {
return V4L2_CID_HUE;
case CV_CAP_PROP_GAIN:
return V4L2_CID_GAIN;
case CV_CAP_PROP_AUTO_EXPOSURE:
return V4L2_CID_EXPOSURE_AUTO;
case CV_CAP_PROP_EXPOSURE:
return V4L2_CID_EXPOSURE;
return V4L2_CID_EXPOSURE_ABSOLUTE;
case CV_CAP_PROP_AUTOFOCUS:
return V4L2_CID_FOCUS_AUTO;
case CV_CAP_PROP_FOCUS:
@ -1645,6 +1649,9 @@ static double icvGetPropertyCAM_V4L (const CvCaptureCAM_V4L* capture,
case CV_CAP_PROP_GAIN:
fprintf (stderr, "Gain");
break;
case CV_CAP_PROP_AUTO_EXPOSURE:
fprintf (stderr, "Auto Exposure");
break;
case CV_CAP_PROP_EXPOSURE:
fprintf (stderr, "Exposure");
break;
@ -1704,6 +1711,13 @@ static bool icvSetControl (CvCaptureCAM_V4L* capture,
return false;
}
if(control.id == V4L2_CID_EXPOSURE_AUTO && control.value == V4L2_EXPOSURE_MANUAL) {
// update the control range for expose after disabling autoexposure
// as it is not read correctly at startup
// TODO check this again as it might be fixed with Linux 4.5
v4l2_control_range(capture, V4L2_CID_EXPOSURE_ABSOLUTE);
}
/* all was OK */
return true;
}