import type {AvcInfo} from './parse-avc';

export const getKeyFrameOrDeltaFromAvcInfo = (
	infos: AvcInfo[],
): 'key' | 'delta' | 'bidirectional' => {
	const keyOrDelta = infos.find(
		(i) => i.type === 'keyframe' || i.type === 'delta-frame',
	);
	if (!keyOrDelta) {
		throw new Error('expected avc to contain info about key or delta');
	}

	return keyOrDelta.type === 'keyframe'
		? 'key'
		: keyOrDelta.isBidirectionalFrame
			? 'bidirectional'
			: 'delta';
};