insert method
Implementation
void insert(int index, Media source) {
final sourceMediaTypeCStr = source.mediaType.toString().toNativeUtf8();
final sourceResourceCStr = source.resource.toString().toNativeUtf8();
PlayerFFI.insert(
this.id,
index,
sourceMediaTypeCStr,
sourceResourceCStr,
);
calloc.free(sourceMediaTypeCStr);
calloc.free(sourceResourceCStr);
}