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Expose options for v4l2

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This commit is contained in:
Kamil Trzcinski
2022-07-08 12:41:08 +02:00
parent 6460d1b902
commit 883a951cea
4 changed files with 59 additions and 0 deletions
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55
device/v4l2/device_options.c
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@ -155,3 +155,58 @@ error:
free(valuep);
return ret;
}
void v4l2_device_dump_options(device_t *dev, FILE *stream)
{
fprintf(stream, "%s Options:\n", dev->name);
for (int i = 0; i < dev->v4l2->ncontrols; i++) {
device_v4l2_control_t *control = &dev->v4l2->controls[i];
fprintf(stream, "- available option: %s (%08x, type=%d): ",
control->control.name, control->control.id, control->control.type);
switch(control->control.type) {
case V4L2_CTRL_TYPE_U8:
case V4L2_CTRL_TYPE_U16:
case V4L2_CTRL_TYPE_U32:
case V4L2_CTRL_TYPE_BOOLEAN:
case V4L2_CTRL_TYPE_INTEGER:
fprintf(stream, "[%lld..%lld]\n", control->control.minimum, control->control.maximum);
break;
case V4L2_CTRL_TYPE_BUTTON:
fprintf(stream, "button\n");
break;
case V4L2_CTRL_TYPE_MENU:
case V4L2_CTRL_TYPE_INTEGER_MENU:
fprintf(stream, "[%lld..%lld]\n", control->control.minimum, control->control.maximum);
for (int j = control->control.minimum; j <= control->control.maximum; j++) {
struct v4l2_querymenu menu = {
.id = control->control.id,
.index = j
};
if (0 == ioctl(control->fd, VIDIOC_QUERYMENU, &menu)) {
if (control->control.type == V4L2_CTRL_TYPE_MENU) {
fprintf(stream, "\t\t%d: %s\n", j, menu.name);
} else {
fprintf(stream, "\t\t%d: %lld\n", j, menu.value);
}
}
}
break;
case V4L2_CTRL_TYPE_STRING:
fprintf(stream, "(string)\n");
break;
default:
fprintf(stream, "(unsupported)\n");
break;
}
}
fprintf(stream, "\n");
}