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import type { Level } from '../types/level';
import type { MediaAttributes, MediaPlaylist } from '../types/media-playlist';
export function subtitleOptionsIdentical(
trackList1: MediaPlaylist[] | Level[],
trackList2: MediaPlaylist[]
): boolean {
if (trackList1.length !== trackList2.length) {
return false;
}
for (let i = 0; i < trackList1.length; i++) {
if (
!subtitleAttributesIdentical(
trackList1[i].attrs as MediaAttributes,
trackList2[i].attrs
)
) {
return false;
}
}
return true;
}
export function subtitleAttributesIdentical(
attrs1: MediaAttributes,
attrs2: MediaAttributes
): boolean {
// Media options with the same rendition ID must be bit identical
const stableRenditionId = attrs1['STABLE-RENDITION-ID'];
if (stableRenditionId) {
return stableRenditionId === attrs2['STABLE-RENDITION-ID'];
}
// When rendition ID is not present, compare attributes
return ![
'LANGUAGE',
'NAME',
'CHARACTERISTICS',
'AUTOSELECT',
'DEFAULT',
'FORCED',
].some(
(subtitleAttribute) =>
attrs1[subtitleAttribute] !== attrs2[subtitleAttribute]
);
}