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More SUCCESS getting and setting parameters (focus, hue) for IIDC VideoDigitizer instances.
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More SUCCESS getting and setting parameters (focus, hue) for IIDC VideoDigitizer instances.

Here's the code to set the focus on an IIDC camera, continued from the previous message.

Note that, in terms of correctness, I should REALLY be checking to see if the VideoDigitizer has a subtype that says it's IIDC before I do any of this, but, frankly, since I just started programming Carbon 5 days ago, I don't know how to get the subtype from a ComponentInstance.

Also, I don't actually know how much of the VDIIDCFeatureAtomTypeAndID structure actually has to be filled out for this to work, since it's, uh, not really documented very well. So I fill in the English name for "Focus" even though it's probably overkill.

-Wil Shipley
Delicious Monster Software


// SET the focus to be manual (at 10 out of 100)
QTAtomContainer iidcFeaturesAtomContainer = NULL;
QTNewAtomContainer(&iidcFeaturesAtomContainer);

// 'feat'
QTAtom featureAtom = NULL;
err = QTInsertChild(iidcFeaturesAtomContainer, kParentAtomIsContainer, vdIIDCAtomTypeFeature, 1, 0, 0, NULL, &featureAtom);
NoteErr(err);
// 't&id'
QTAtom typeAndIDAtom = NULL;
VDIIDCFeatureAtomTypeAndID featureAtomTypeAndID = {vdIIDCFeatureFocus, vdIIDCGroupMechanics, {5, 'F', 'o', 'c', 'u', 's'}, vdIIDCAtomTypeFeatureSettings, vdIIDCAtomIDFeatureSettings};
err = QTInsertChild(iidcFeaturesAtomContainer, featureAtom, vdIIDCAtomTypeFeatureAtomTypeAndID, vdIIDCAtomIDFeatureAtomTypeAndID, 0, sizeof(featureAtomTypeAndID), &featureAtomTypeAndID, &typeAndIDAtom);
NoteErr(err);
// 'fstg'
QTAtom featureSettingsAtom = NULL;
VDIIDCFeatureSettings featureSettings = {{0, 0, 0, 0.0, 0.0}, {vdIIDCFeatureFlagOn | vdIIDCFeatureFlagManual | vdIIDCFeatureFlagRawControl, 0.1}};
err = QTInsertChild(iidcFeaturesAtomContainer, featureAtom, vdIIDCAtomTypeFeatureSettings, vdIIDCAtomIDFeatureSettings, 0, sizeof(featureSettings), &featureSettings, &featureSettingsAtom);
NoteErr(err);

err = VDIIDCSetFeatures(SGGetVideoDigitizerComponent(sequenceGrabberChannel), iidcFeaturesAtomContainer);
NoteErr(err);
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