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usb_webcam: correctly enable auto exposure mode

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genodelabs/genode#4231
This commit is contained in:
Johannes Schlatow 2021-07-22 14:36:28 +02:00 committed by Christian Helmuth
parent 9334ec09e2
commit b38ec9f238
1 changed files with 35 additions and 2 deletions
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37
repos/libports/src/app/usb_webcam/main.cc
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@ -194,8 +194,41 @@ class Webcam
return -5;
}
/* e.g., turn on auto exposure */
uvc_set_ae_mode(_handle, 1);
/**
* Turn on auto exposure if not already set.
* There are three auto exposure modes (0x2, 0x4, 0x8), which we
* must first check whether supported by the device.
*/
uint8_t aemode = 0;
if (uvc_get_ae_mode(_handle, &aemode, UVC_GET_CUR) != UVC_SUCCESS) {
error("uvc_get_ae_mode() failed");
return 0;
}
enum {
MANUAL = 0x1,
FULL_AUTO = 0x2,
IRIS_AUTO = 0x4,
TIME_AUTO = 0x8
};
/* manual focus mode active? */
if (aemode == MANUAL) {
uint8_t aemodes_avail = 0;
/* get available modes */
if (uvc_get_ae_mode(_handle, &aemodes_avail, UVC_GET_RES) != UVC_SUCCESS) {
error("uvc_get_ae_mode(UVC_GET_RES) failed");
return 0;
}
if (aemodes_avail & FULL_AUTO)
uvc_set_ae_mode(_handle, FULL_AUTO);
else if (aemodes_avail & IRIS_AUTO)
uvc_set_ae_mode(_handle, IRIS_AUTO);
else if (aemodes_avail & TIME_AUTO)
uvc_set_ae_mode(_handle, TIME_AUTO);
}
return 0;
});